CN113187569A - Double-extraction and condensation dual-purpose system based on steam ejector and operation method - Google Patents
Double-extraction and condensation dual-purpose system based on steam ejector and operation methodDownload PDFInfo
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- CN113187569A CN113187569ACN202110602030.XACN202110602030ACN113187569ACN 113187569 ACN113187569 ACN 113187569ACN 202110602030 ACN202110602030 ACN 202110602030ACN 113187569 ACN113187569 ACN 113187569A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/38—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating the engines being of turbine type
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/02—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of multiple-expansion type
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/44—Use of steam for feed-water heating and another purpose
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
- F22D1/325—Schematic arrangements or control devices therefor
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D1/00—Steam central heating systems
- F24D1/08—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks
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- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
- Control Of Turbines (AREA)
Abstract
Translated fromChinese
Description
Technical Field
The invention belongs to the technical field of steam supply, and particularly relates to a dual-extraction and condensation dual-purpose system based on a steam ejector and an operation method.
Background
The cogeneration is a technology of comprehensively utilizing energy, realizes energy conservation, improves environmental conditions, improves the living standard of residents, and plays a positive role in solving the increasing power supply and urban heat supply in the process of urbanization in China. With the rapid development of wind power, photovoltaic and nuclear power and the increase of the consumption of renewable energy in China, the problem of peak shaving of a power grid caused by surplus electric power production is very prominent. For the double-pumping condensing heat supply unit, the restriction relationship between heat and electric loads is limited, when the electric load rate of the cogeneration unit is too low, the unit cannot participate in peak shaving flexible heat supply, so that the heat load cannot meet the user demand, and the electric load of the unit needs to be increased to improve the heat load, thereby increasing the heat supply cost and increasing the resource waste.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a dual-extraction and condensing dual-purpose system based on a steam ejector and an operation method thereof, and solves the problems that the conventional dual-extraction and condensing heat supply unit cannot participate in peak regulation and flexible heat supply, the heat supply cost is high, and the resource waste is serious.
In order to achieve the purpose, the invention provides the following technical scheme: a double-extraction and condensing dual-purpose system based on a steam ejector comprises a boiler, a plurality of steam turbine pressure cylinders, a plurality of ejectors and a plurality of heaters, wherein the steam turbine pressure cylinders correspond to the ejectors one by one, the outlet of a reheater of the boiler is connected with the steam inlet of the first steam turbine pressure cylinder, and the outlet of the reheater of the boiler is also connected with the steam inlet of the first ejector;
the steam outlet of the current steam turbine pressure cylinder is connected with the steam inlet of the next steam turbine pressure wheel, and the steam outlet of the current steam turbine pressure cylinder is also connected with the steam inlet of the current ejector, the steam outlet of the current ejector and the steam inlet of the next ejector;
the steam outlet of the last turbine pressure cylinder is connected to the steam inlet of the last ejector and the steam inlet of the next heater;
the steam outlet of the current ejector is connected with the steam inlet of the current heater, and the last heater is not connected with the ejector.
Furthermore, the plurality of steam turbine pressure cylinders comprise a steam turbine intermediate pressure cylinder, the plurality of ejectors comprise a first ejector, the plurality of heaters comprise a first heater and a second heater, an outlet of a reheater of the boiler is connected with a steam inlet of the steam turbine intermediate pressure cylinder, an outlet of the reheater of the boiler is also connected with a steam inlet of the first ejector,
the steam outlet of the steam turbine intermediate pressure cylinder is connected with the steam inlet of the first ejector, the steam outlet of the first ejector is connected with the first heater, and the steam outlet of the steam turbine intermediate pressure cylinder is further connected with the steam inlet of the second heater.
Furthermore, the plurality of steam turbine pressure cylinders further comprise a steam turbine intermediate pressure cylinder and a steam turbine low pressure cylinder, the plurality of ejectors further comprise a first ejector and a second ejector, the plurality of heaters further comprise a first heater, a second heater and a third heater, an outlet of a reheater of the boiler is connected with a steam inlet of the steam turbine intermediate pressure cylinder, an outlet of the reheater of the boiler is further connected with a steam inlet of the first ejector,
a steam outlet of the steam turbine intermediate pressure cylinder is connected with a steam inlet of the first ejector and a steam outlet of the first ejector, and the steam outlet of the first ejector is connected with the first heater; the steam outlet of the steam turbine intermediate pressure cylinder is also connected with the steam inlet of the steam turbine low pressure cylinder and the steam inlet of the second ejector, and the steam outlet of the second ejector is connected with the second heater;
and a steam outlet of the steam turbine low-pressure cylinder is connected with a steam inlet of the second ejector and a steam inlet of the third heater.
Further, still include the steam turbine high pressure cylinder, the main steam exit linkage steam inlet of the steam turbine high pressure cylinder of boiler, the steam exhaust mouth and the pipeline A of steam turbine high pressure cylinder are connected, the reheater exit linkage of boiler has pipeline B.
Furthermore, the steam-assisted heat recovery device further comprises a third ejector, a superheater outlet of the boiler is connected with a steam inlet of the third ejector, a reheater outlet of the boiler is connected with a steam inlet of the third ejector, and a steam outlet of the third ejector is connected with a pipeline C.
Furthermore, a first valve is arranged on a pipeline connected with a steam exhaust port of the high-pressure cylinder of the steam turbine and the pipeline A, a second valve is arranged on a pipeline connected with a reheater outlet of the boiler and the pipeline B, an eleventh valve is arranged on a pipeline connected with the reheater outlet of the boiler and the third ejector, and a twelfth valve is arranged on a pipeline connected with a main steam outlet of the boiler and the high-pressure cylinder of the steam turbine.
Furthermore, the steam outlet of the last turbine pressure cylinder is sequentially connected with a condenser, a condensate pump, a low-pressure heater group, a feed pump and a high-pressure heater group, the outlet of the high-pressure heater group is connected to the boiler, and the water supplementing inlet of the condenser is connected with a water source pipeline.
Furthermore, a deaerator is connected between the low-pressure heater group and the water feeding pump.
Furthermore, on a pipeline connecting an outlet of a reheater of the boiler and a steam inlet of a first turbine pressure cylinder, a pipeline connecting an outlet of the reheater of the boiler and a steam inlet of a first ejector, a pipeline connecting a steam outlet of a current turbine pressure cylinder and a steam inlet of a next turbine pressure wheel, and a pipeline connecting a steam outlet of a current turbine pressure cylinder and a steam inlet of a current ejector, valves are arranged on a pipeline for connecting the steam outlet of the current steam turbine pressure cylinder with the steam outlet of the current ejector, a pipeline for connecting the steam outlet of the current steam turbine pressure cylinder with the steam inlet of the next ejector, a pipeline for connecting the steam outlet of the last steam turbine pressure cylinder with the steam inlet of the last ejector, and a pipeline for connecting the steam outlet of the last steam turbine pressure cylinder with the steam inlet of the next heater.
The invention also provides an operation method of the double-extraction and condensation dual-purpose system based on the steam ejector, which comprises the following steps: when the unit operates at a low load, a reheater outlet of the boiler outputs reheated steam to a first steam turbine pressure cylinder and a first ejector, the first ejector receives the steam output by the first steam turbine pressure cylinder, the reheated steam of the boiler ejects the steam output by the first steam turbine pressure cylinder, and the steam output by the first steam turbine pressure cylinder and the steam output by the first ejector are input into a first heater together for heat release;
steam is output to next-stage turbo-charging jar and current ejector and next ejector to current steam turbine pressurized cylinder, and the steam of current steam turbine pressurized cylinder output is penetrated through the steam of previous steam turbine pressurized cylinder output, carries out exothermic step by step in the input heater to analogize to this.
Compared with the prior art, the invention has at least the following beneficial effects:
the invention provides a dual-extraction and condensing dual-purpose system based on a steam ejector, which is characterized in that a reheater outlet of a boiler is connected with a steam inlet of a first steam turbine pressure cylinder and is connected with a steam inlet of the first ejector, a steam outlet of the current steam turbine pressure cylinder is connected with a steam inlet of a next steam turbine pressure wheel, a steam inlet of the current ejector, a steam outlet of the current ejector and a steam inlet of the next ejector, the connection design of the reheated steam output by the boiler to eject the steam output by the first steam turbine pressure cylinder and the steam outlet of the current ejector is satisfied, the steam output by the current steam turbine pressure cylinder is ejected by the steam output by the previous steam turbine pressure cylinder among each steam turbine pressure cylinder, a part of high-grade steam is replaced by low-grade steam, and a plurality of steam turbine pressure cylinders are utilized to realize the purpose of energy gradient utilization, so that a heater forms gradient heating, the heat supply is guaranteed, meanwhile, the heat supply cost is reduced, the heat supply economical efficiency is high, the energy utilization rate is improved, and the peak regulation flexible heat supply of the double-pumping condensing heat supply unit is guaranteed.
Furthermore, when the heating and heat supply capacity is finished, industrial steam supply can be finished, when the industrial steam supply quantity is required to be small, the system preferentially supplies industrial steam through the pipeline A, the used steam source is the reheating and cooling section steam extraction, the parameter matching performance is good, the heat supply economy is high, when the industrial air supply quantity is large, the industrial steam can be provided through the pipeline B and the pipeline A together, the requirements of various industrial conditions are met, and the energy utilization efficiency is high.
Furthermore, superheated high-pressure steam of the boiler and reheated steam of the boiler are simultaneously input into the third ejector, and main steam is used as high-pressure steam for ejecting steam from an outlet of a reheater of the boiler.
Furthermore, the last turbine pressure cylinder can continuously supply water sources to the whole system through the condenser, the steam generation amount of the boiler is guaranteed, and the whole system is guaranteed to be reliable.
Furthermore, the valves arranged in the whole system can adjust the steam distribution of the pressure cylinders according to the actual running condition of the unit, so that the reliable running of the whole system is ensured.
The invention also provides an operation method of the double-extraction and condensing dual-purpose system based on the steam ejector, the steam of the first turbine pressure cylinder is ejected by the reheated steam of the boiler, the steam of the previous turbine pressure cylinder ejects the steam of the current turbine pressure cylinder, part of high-grade steam is replaced by low-grade steam, the heat supply cost is reduced, the heat supply economical efficiency is improved, and the steam discharged by the turbine is utilized in a gradient manner, so that a hot water network is heated in a gradient manner, the heat supply continuity is ensured, and the energy utilization rate is also improved.
Drawings
FIG. 1 is a block diagram of the system of the present invention;
in the drawings: 1-boiler, 2-high pressure cylinder of turbine, 3-medium pressure cylinder of turbine, 4-low pressure cylinder of turbine, 5-condenser, 6-condensate pump, 7-low pressure heater group, 8-deaerator, 9-feed water pump, 10-high pressure heater group, 11-third ejector, 12-first ejector, 13-second ejector, 14-first heater, 15-second heater, 16-third heater, 17-first valve, 18-second valve, 19-third valve, 20-fourth valve, 21-fifth valve, 22-sixth valve, 23-seventh valve, 24-eighth valve, 25-ninth valve, 26-tenth valve, 27-eleventh valve, 28-twelfth valve, 29-thirteenth valve.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
As shown in fig. 1, the invention provides a dual-extraction and condensing dual-purpose system based on a steam ejector, which comprises a boiler 1, a plurality of steam turbine pressurized cylinders, a plurality of ejectors and a plurality of heaters, wherein the steam turbine pressurized cylinders correspond to the ejectors one by one, the total number of the heaters is different from the number of the ejectors by one, a reheater outlet of the boiler is connected with a steam inlet of a first steam turbine pressurized cylinder, and a reheater outlet of the boiler is also connected with a steam inlet of the first ejector;
the steam outlet of the current steam turbine pressure cylinder is connected with the steam inlet of the next steam turbine pressure wheel, and the steam outlet of the current steam turbine pressure cylinder is also connected with the steam inlet of the current ejector, the steam outlet of the current ejector and the steam inlet of the next ejector;
the steam outlet of the last turbine pressure cylinder is connected to the steam inlet of the last ejector and the steam inlet of the next heater;
the steam outlet of the current ejector is connected with the steam inlet of the current heater, and the last heater is not connected with the ejector.
Specifically, on a pipeline connecting an outlet of a reheater of the boiler 1 with a steam inlet of a first turbine pressure cylinder, on a pipeline connecting an outlet of the reheater of the boiler with a steam inlet of a first ejector, on a pipeline connecting a steam outlet of a current turbine pressure cylinder with a steam inlet of a next turbine pressure wheel, on a pipeline connecting a steam outlet of a current turbine pressure cylinder with a steam inlet of a current ejector, valves are arranged on a pipeline for connecting the steam outlet of the current steam turbine pressure cylinder with the steam outlet of the current ejector, a pipeline for connecting the steam outlet of the current steam turbine pressure cylinder with the steam inlet of the next ejector, a pipeline for connecting the steam outlet of the last steam turbine pressure cylinder with the steam inlet of the last ejector, and a pipeline for connecting the steam outlet of the last steam turbine pressure cylinder with the steam inlet of the next heater.
In the embodiment, an operation method of a dual-extraction and condensation dual-purpose system based on a steam ejector is provided, and the operation method comprises the following steps: when the unit operates at low load, a reheater outlet of the boiler 1 outputs reheated steam to a first steam turbine pressure cylinder and a first ejector, the first ejector receives the steam output by the first steam turbine pressure cylinder, the reheated steam of the boiler 1 ejects the steam output by the first steam turbine pressure cylinder, and the steam output by the first steam turbine pressure cylinder and the steam output by the first ejector are input into a first heater together for heat release;
steam is output to next-stage turbo-charging jar and current ejector and next ejector to current steam turbine pressurized cylinder, and the steam of current steam turbine pressurized cylinder output is penetrated through the steam of previous steam turbine pressurized cylinder output, heats in the input heater step by step to analogize in this way.
In one embodiment of the invention, a dual-extraction and condensing dual-purpose system based on a steam ejector comprises a heating and heat supply system and an industrial steam supply system, wherein the heating and heat supply system comprises a plurality of ejectors and a plurality of heaters, the plurality of ejectors adopt a first ejector 12, the plurality of heaters adopt two heaters which are respectively a first heater 14 and a second heater 15, and the industrial steam supply system comprises a boiler 1, a steam turbine high-pressure cylinder 2, a plurality of steam turbine cylinders, acondenser 5, a condensate pump 6, a low-pressure heater group 7, a water feed pump 9 and a high-pressure heater group 10; wherein a plurality of the steam turbine pressure cylinders adopt a steam turbine intermediate pressure cylinder 3,
specifically, the heating system has the following structure: a reheater outlet of the boiler 1 is connected with a steam inlet of the steam turbine intermediate pressure cylinder 3, and the reheater outlet of the boiler is also connected with a steam inlet of the first ejector 12;
the steam outlet of the steam turbine intermediate pressure cylinder 3 is connected with the steam inlet of a first ejector 12, the steam outlet of the first ejector 12 is connected with a first heater 14, and the steam outlet of the steam turbine intermediate pressure cylinder 3 is also connected with the steam inlet of a second heater 15;
specifically, the steam outlet of the steam turbine intermediate pressure cylinder 3 is connected with acondenser 5, a condensate pump 6, a low-pressure heater group 7, a deaerator 8, a feed pump 9 and a high-pressure heater group 10 in sequence, the outlet of the high-pressure heater group 10 is connected to the boiler 1, and the water supplementing inlet of thecondenser 5 is connected with a water source pipeline.
Further, athirteenth valve 29 is arranged on a pipeline connecting the reheater outlet of the boiler 1 and the steam inlet of the steam turbine intermediate pressure cylinder 3, a third valve 19 is arranged on a pipeline connecting the reheater outlet of the boiler 1 and the steam inlet of the first ejector 12, aneighth valve 24 is arranged on a pipeline connecting the steam outlet of the steam turbine intermediate pressure cylinder 3 and the steam inlet of the first ejector 12, and valves are also arranged on a pipeline connecting the steam outlet of the steam turbine intermediate pressure cylinder 3 and the steam inlet of the second heater 15.
Specifically, the structure of the industrial steam supply system is as follows: a main steam outlet of the boiler 1 is connected with a steam inlet of a high-pressure steam turbine cylinder 2, a steam exhaust port of the high-pressure steam turbine cylinder 2 is connected with a pipeline A, and a reheater outlet of the boiler 1 is connected with a pipeline B;
the superheater outlet of the boiler 1 is connected with the steam inlet of the third ejector 11, the reheater outlet of the boiler 1 is also connected with the steam inlet of the third ejector 11, and the steam outlet of the third ejector 11 is connected with a pipeline C.
Further, a first valve 17 is arranged on a pipeline connecting a steam exhaust port of the steam turbine high-pressure cylinder 2 and the pipeline a, asecond valve 18 is arranged on a pipeline connecting a reheater outlet of the boiler 1 and the pipeline B, aneleventh valve 27 is arranged on a pipeline connecting the reheater outlet of the boiler 1 and the third ejector 11, and atwelfth valve 28 is arranged on a pipeline connecting a main steam outlet of the boiler 1 and the steam turbine high-pressure cylinder 2.
In this embodiment, an operation method of a dual-extraction and condensing dual-purpose system based on a steam ejector includes the following steps: the system preferentially supplies industrial steam through a pipeline A, if the supply is insufficient, the rest required industrial steam is supplied through a pipeline B, and if the unit runs at low load and the pressures of the pipeline A and the pipeline B are insufficient, a third ejector 11 is started to meet the requirement of the industrial steam; the third ejector 11 functions as: the main steam is used as high-pressure steam to inject the steam from the outlet of the boiler reheater to form the steam meeting the industrial steam supply pressure requirement
The method specifically comprises the following steps: the method comprises the following steps that a boiler 1 outputs main steam to a steam turbine high-pressure cylinder 2, steam is output to a pipeline A from a steam outlet of the steam turbine high-pressure cylinder 2, wherein the maximum value of steam supply on the pipeline A is 5% of the flow of reheat steam before steam supply, the reheat steam of the boiler 1 is input to a pipeline B, if a unit runs at a low load, and the pressures of the pipeline A and the pipeline B are insufficient, the superheat steam and the reheat steam of the boiler 1 are both input to a third ejector 11, and a part of high-grade steam is replaced by the low-grade steam to form steam meeting the industrial steam supply pressure requirement;
when the unit load is lower, when the heat supply is not enough, launch first ejector 12 and go to satisfy industrial steam, first ejector 12's effect is: the reheat steam is used as high-pressure steam to inject steam from an outlet of a steam turbine intermediate pressure cylinder to form steam meeting the heating pressure requirement, the reheat steam of the boiler 1 is output to the steam turbine intermediate pressure cylinder 3 and a first ejector 12, the steam of the steam turbine intermediate pressure cylinder 3 is input into the first ejector 12 and a second heater 15, low-grade steam of the steam turbine intermediate pressure cylinder 3 replaces part of high-grade reheat steam output by the boiler to form steam meeting the heating pressure requirement, and heat network water absorbs heat in the second heater 15 and the first heater 14 in sequence and then heats and supplies heat to the outside.
Then the boiler 1 inputs water resource through acondenser 5, a condensate pump 6, a low-pressure heater group 7, a deaerator 8, a feed pump 9 and a high-pressure heater group 10.
In a preferred embodiment of the invention, a dual-extraction and condensing dual-purpose system based on a steam ejector comprises a heating and heat supply system and an industrial steam supply system, wherein the heating and heat supply system comprises a plurality of ejectors and a plurality of heaters, the plurality of ejectors adopt a first ejector 12 and a second ejector 13, the plurality of heaters adopt three heaters as a first heater 12, a second heater 13 and a third heater 11, and the industrial steam supply system comprises a boiler 1, a steam turbine high-pressure cylinder 2, a plurality of steam turbine pressure cylinders, acondenser 5, a condensate pump 6, a low-pressure heater group 7, a water feed pump 9 and a high-pressure heater group 10; the plurality of turbine pressure cylinders adopt a turbine intermediate pressure cylinder 3 and a turbine low pressure cylinder 4;
specifically, the structure of the industrial steam supply system is as follows: atwelfth valve 28 is arranged on a pipeline of a main steam outlet of the boiler 1 communicated with an inlet of the high-pressure cylinder 2 of the steam turbine, a steam outlet of the high-pressure cylinder of the steam turbine is connected with a pipeline A, a first valve 17 is arranged on the pipeline A, an outlet of a boiler reheater is communicated with the third ejector 11 through a pipeline, aneleventh valve 27 is arranged on a pipeline of the boiler superheater, which is communicated with the third ejector 11, an outlet of the boiler reheater is connected with a pipeline B, and asecond valve 18 is arranged on the pipeline B;
the maximum steam supply quantity on the pipeline A is 5 percent of the reheat steam flow quantity before steam supply.
Specifically, the heating system has the following structure: athirteenth valve 29 is arranged on a pipeline of the reheated steam at the outlet of the boiler communicated with the inlet of the steam turbine intermediate pressure cylinder 3, a third valve 19 is arranged on a pipeline of the reheater at the outlet of the boiler communicated with the first ejector 12,
atenth valve 26 is installed on a pipeline of the first ejector 12 communicated with the steam inlet of the first heater 14, aneighth valve 24 is installed on a pipeline of the steam outlet of the steam turbine intermediate pressure cylinder 3 communicated with the first ejector 12, a ninth valve 25 is installed on a pipeline of the steam outlet of the steam turbine intermediate pressure cylinder 3 communicated with the steam inlet of the first heater 14, afourth valve 20 is installed on a pipeline of the steam outlet of the steam turbine intermediate pressure cylinder 3 communicated with the second ejector 13, and afifth valve 21 is installed on a pipeline of the steam outlet of the steam turbine intermediate pressure cylinder 3 communicated with the inlet of the steam turbine low pressure cylinder 4;
asixth valve 22 is installed on a pipeline of the steam outlet of the steam turbine low pressure cylinder 4 communicated with the second ejector 13, the second ejector 13 is communicated with the steam inlet of the second heater 15, and aseventh valve 23 is installed on a pipeline of the steam outlet of the steam turbine low pressure cylinder 4 communicated with the steam inlet of thethird heater 16.
The heat supply network water is communicated with thethird heater 16, the second heater 15 and the first heater 14 through pipelines in sequence, so that heat is absorbed in thethird heater 16, the second heater 15 and the first heater 14 in sequence and then heat is supplied to the outside.
In this embodiment, an operation method of a dual-extraction and condensing dual-purpose system based on a steam ejector includes the following steps: the system preferentially supplies industrial steam through a pipeline A, if the supply is insufficient, the rest required industrial steam is supplied through a pipeline B, and if the unit runs at low load and the pressures of the pipeline A and the pipeline B are insufficient, a third ejector 11 is started to meet the requirement of the industrial steam; the third ejector 11 functions as: the main steam is used as high-pressure steam to inject the steam from the outlet of the boiler reheater to form the steam meeting the industrial steam supply pressure requirement
The method specifically comprises the following steps: the method comprises the following steps that a boiler 1 outputs main steam to a steam turbine high-pressure cylinder 2, steam is output to a pipeline A from a steam outlet of the steam turbine high-pressure cylinder 2, wherein the maximum value of steam supply on the pipeline A is 5% of the flow of reheat steam before steam supply, the reheat steam of the boiler 1 is input to a pipeline B, if a unit runs at a low load, and the pressures of the pipeline A and the pipeline B are insufficient, the superheat steam and the reheat steam of the boiler 1 are both input to a third ejector 11, and a part of high-grade steam is replaced by the low-grade steam to form steam meeting the industrial steam supply pressure requirement;
when the unit load is lower, when the heat supply is not enough, launch first ejector 12 and go to satisfy industrial steam, first ejector 12's effect is: the reheated steam is used as high-pressure steam to inject steam from the outlet of the steam turbine intermediate pressure cylinder 3 to form steam meeting the requirement of heating pressure, and the reheated steam of the boiler 1 is output to the steam turbine intermediate pressure cylinder 3 and the first injector 12;
steam of the steam turbine intermediate pressure cylinder 3 is input into a first ejector 12, a second ejector 13, the steam turbine low pressure cylinder 4 and a pipeline between the first ejector 12 and a first heater 14, the steam flow direction of the steam turbine intermediate pressure cylinder 3 is specifically controlled through a valve, low-grade steam output by the steam turbine intermediate pressure cylinder 3 can replace part of high-grade steam output by a boiler through the first ejector 12 so as to be input into the first heater 14,
simultaneously, the second ejector 13 is started, and the second ejector 13 has the following functions: steam at the outlet of the steam turbine intermediate pressure cylinder 3 is used as high-pressure steam to inject steam from the outlet 4 of the steam turbine low pressure cylinder to form steam higher than the steam pressure at the outlet of the low pressure cylinder, the steam of the steam turbine low pressure cylinder 4 is input into the second ejector 13 and thethird heater 16, low-grade steam output by the steam turbine low pressure cylinder 4 replaces part of high-grade steam output by the steam turbine intermediate pressure cylinder 3, so that the high-grade steam is input into the second heater 15, part of steam of the steam turbine pneumatic cylinder is directly sent into thethird heater 16, and the steam flow direction of the steam turbine low pressure cylinder 4 is specifically controlled by a valve;
the heat supply network water absorbs heat in thethird heater 16, the second heater 15 and the first heater 14 in sequence and then heats and supplies heat to the outside, a steam source of thethird heater 16 is steam at the outlet of the low-pressure cylinder of the steam turbine, a steam source of the second heater 15 is steam at the outlet of the second ejector 13, a steam source of the first heater 14 is steam at the outlet of the medium-pressure cylinder of the steam turbine, and when industrial steam supply is too much or the load of a unit is low, and the steam pressure at the outlet of the medium-pressure cylinder 3 of the steam turbine is insufficient, the steam source of the first heater 14 is switched to the steam at the outlet of the first ejector.
Then the boiler 1 inputs water resource through acondenser 5, a condensate pump 6, a low-pressure heater group 7, a deaerator 8, a feed pump 9 and a high-pressure heater group 10.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A double-extraction and condensing dual-purpose system based on a steam ejector is characterized by comprising a boiler (1), a plurality of steam turbine pressure cylinders, a plurality of ejectors and a plurality of heaters, wherein the steam turbine pressure cylinders correspond to the ejectors one by one, an outlet of a reheater of the boiler (1) is connected with a steam inlet of a first steam turbine pressure cylinder, and an outlet of the reheater of the boiler (1) is also connected with a steam inlet of the first ejector;
the steam outlet of the current steam turbine pressure cylinder is connected with the steam inlet of the next steam turbine pressure wheel, and the steam outlet of the current steam turbine pressure cylinder is also connected with the steam inlet of the current ejector, the steam outlet of the current ejector and the steam inlet of the next ejector;
the steam outlet of the last turbine pressure cylinder is connected to the steam inlet of the last ejector and the steam inlet of the next heater;
the steam outlet of the current ejector is connected with the steam inlet of the current heater, and the last heater is not connected with the ejector.
2. The dual-extraction and condensing dual-purpose system based on the steam ejector is characterized in that a plurality of steam turbine pressurizing cylinders comprise a steam turbine intermediate pressure cylinder (3), a plurality of ejectors comprise a first ejector (12), a plurality of heaters comprise a first heater (14) and a second heater (15), an outlet of a reheater of the boiler (1) is connected with a steam inlet of the steam turbine intermediate pressure cylinder (3), an outlet of the reheater of the boiler (1) is also connected with a steam inlet of the first ejector (12),
the steam outlet of the steam turbine intermediate pressure cylinder (3) is connected with the steam inlet of the first ejector (12), the steam outlet of the first ejector (12) is connected with the first heater (14), and the steam outlet of the steam turbine intermediate pressure cylinder (3) is further connected with the steam inlet of the second heater (15).
3. The dual-extraction and condensing dual-purpose system based on the steam ejector is characterized in that the plurality of steam turbine pressure cylinders further comprise a steam turbine intermediate pressure cylinder (3) and a steam turbine low pressure cylinder (4), the plurality of ejectors further comprise a first ejector (12) and a second ejector (13), the plurality of heaters further comprise a first heater (14), a second heater (15) and a third heater (16), an outlet of a reheater of the boiler (1) is connected with a steam inlet of the steam turbine intermediate pressure cylinder (3), an outlet of the reheater of the boiler (1) is further connected with a steam inlet of the first ejector (12),
a steam outlet of the steam turbine intermediate pressure cylinder (3) is connected with a steam inlet of the first ejector (12) and a steam outlet of the first ejector (12), and a steam outlet of the first ejector (12) is connected with the first heater (14); the steam outlet of the steam turbine intermediate pressure cylinder (3) is also connected with the steam inlet of the steam turbine low pressure cylinder (4) and the steam inlet of the second ejector (13), and the steam outlet of the second ejector (13) is connected with the second heater (15);
and a steam outlet of the steam turbine low-pressure cylinder (4) is connected with a steam inlet of the second ejector (13) and a steam inlet of the third heater (16).
4. The dual-purpose system of double extraction and condensation based on the steam ejector is characterized by further comprising a high-pressure steam turbine cylinder (2), a main steam outlet of the boiler (1) is connected with a steam inlet of the high-pressure steam turbine cylinder (2), a steam exhaust port of the high-pressure steam turbine cylinder (2) is connected with a pipeline A, and a reheater outlet of the boiler (1) is connected with a pipeline B.
5. The dual-extraction and condensing dual-purpose system based on the steam ejector is characterized by further comprising a third ejector (11), a superheater outlet of the boiler (1) is connected with a steam inlet of the third ejector (11), a reheater outlet of the boiler (1) is further connected with a steam inlet of the third ejector (11), and a steam outlet of the third ejector (11) is connected with a pipeline C.
6. The dual-purpose system for double extraction and condensation based on the steam ejector is characterized in that a first valve (17) is arranged on a pipeline connected with a steam exhaust port of a high-pressure turbine cylinder (2) and a pipeline A, a second valve (18) is arranged on a pipeline connected with a reheater outlet of a boiler (1) and a pipeline B, an eleventh valve (27) is arranged on a pipeline connected with a reheater outlet of the boiler (1) and a third ejector (11), and a twelfth valve (28) is arranged on a pipeline connected with a main steam outlet of the boiler (1) and the high-pressure turbine cylinder (2).
7. The dual-extraction and condensing dual-purpose system based on the steam ejector is characterized in that a steam outlet of the last turbine pressure cylinder is sequentially connected with a condenser (5), a condensate pump (6), a low-pressure heater group (7), a water feeding pump (9) and a high-pressure heater group (10), an outlet of the high-pressure heater group (10) is connected to the boiler (1), and a water supplementing inlet of the condenser (5) is connected with a water source pipeline.
8. The dual-extraction and steam-condensation dual-purpose system based on the steam ejector is characterized in that a deaerator (8) is connected between the low-pressure heater group (7) and the water feeding pump (9).
9. The dual-extraction and condensing dual-purpose system based on the steam ejector as claimed in claim 1, wherein the reheater outlet of the boiler (1) is connected to the steam inlet of the first steam turbine pressurized cylinder, the reheater outlet of the boiler (1) is connected to the steam inlet of the first ejector, the steam outlet of the current steam turbine pressurized cylinder is connected to the steam inlet of the next steam turbine pressurized wheel, the steam outlet of the current steam turbine pressurized cylinder is connected to the steam inlet of the current ejector, the steam outlet of the current steam turbine pressurized cylinder is connected to the steam outlet of the current ejector, the steam outlet of the current steam turbine pressurized cylinder is connected to the steam inlet of the next steam turbine pressurized cylinder, and the steam outlet of the last steam turbine pressurized cylinder is connected to the steam inlet of the last ejector, And valves are arranged on pipelines connected with the steam outlet of the last turbine pressure cylinder and the steam inlet of the next heater.
10. The operation method of the dual-extraction and condensation system based on the steam ejector according to any one of claims 1 to 9, characterized by comprising the following steps: when the unit is in low-load operation, a reheater outlet of the boiler (1) outputs reheated steam to a first steam turbine pressure cylinder and a first ejector, the first ejector receives the steam output by the first steam turbine pressure cylinder, the reheated steam of the boiler ejects the steam output by the first steam turbine pressure cylinder, and the steam output by the first steam turbine pressure cylinder and the steam output by the first ejector are input into a first heater together for heat release;
steam is output to next-stage turbo-charging jar and current ejector and next ejector to current steam turbine pressurized cylinder, and the steam of current steam turbine pressurized cylinder output is penetrated through the steam of previous steam turbine pressurized cylinder output, carries out exothermic step by step in the input heater to analogize to this.
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