Geothermal photo-thermal combined type continuous power generation systemTechnical Field
The invention relates to the technical field of renewable resource power generation, in particular to a geothermal photo-thermal composite continuous power generation system.
Background
The geothermal resource is a renewable clean energy source, has the characteristics of cleanness, environmental protection, wide application, good stability, recycling and the like, is not interfered by external factors such as seasons, weather, day and night changes and the like, and is a realistic and competitive new energy source.
The geothermal resources in China are rich and widely distributed, the world geothermal energy is directly utilized in the first country, but a large amount of geothermal resources (90-150 ℃) are adopted for single geothermal heating, the temperature requirement is low (about 50 ℃), and waste is caused to the grade of the geothermal energy from the thermodynamic aspect; and the annual heating time is generally 4-5 months, so that the geothermal resource capacity can not be fully exerted, and the project revenue capacity and profit margin are limited. In the aspect of geothermal power generation, although China makes active exploration and contribution to the field of medium-low temperature geothermal power generation, low-parameter heat source power generation is generally low in efficiency and small in installed load due to the limitation of geothermal resource grade, and profitability is limited.
Compared with the characteristics of the geothermal energy and the solar energy, the geothermal energy and the solar energy have complementary conditions in the aspects of energy grade, space-time distribution law, power generation utilization scale, energy utilization hours and the like, so that the geothermal energy and the solar energy are combined, the advantages of the two clean renewable energy sources are maximized.
Disclosure of Invention
In order to solve the technical problems, the invention provides a geothermal photo-thermal composite continuous power generation system.
The technical scheme of the invention is as follows:
a geothermal photo-thermal composite continuous power generation system comprising:
Geothermal water circulation system, photo-thermal heat collection system, power generation system and condensation system;
The geothermal water circulation system is connected with the light and heat collection system through a pipeline, and the working medium provides energy for the power generation system to generate power through the geothermal water circulation system and/or the light and heat collection system;
the power generation system is connected with the condensing system through a pipeline, and the condensing system condenses the exhaust gas of the power generation system and sends the exhaust gas into the geothermal water circulating system.
Optionally, the power generation system comprises a high-pressure turbine generator set, a first generator, a low-pressure turbine generator set and a second generator;
the photo-thermal heat collection system, the high-pressure turbine generator set and the first generator are connected in a pipeline mode in sequence;
the geothermal water circulation system, the low-pressure turbine generator set and the second generator are connected in a pipeline way in sequence;
the high-pressure turbine generator set is connected with the low-pressure turbine generator set through a pipeline, and the low-pressure turbine generator set is connected with the condensing system through a pipeline.
Optionally, the geothermal water circulation system comprises a submersible pump, a cyclone sand remover, a geothermal heat exchanger, a geothermal tail water filter and a recharging pressure pump which are connected in sequence;
The geothermal heat exchanger is connected with the light and heat collecting system pipeline;
the geothermal heat exchanger, the low-pressure turbine generator set and the second generator are connected in a pipeline mode in sequence.
Optionally, the geothermal water circulation system further comprises a geothermal production well and a geothermal recharging well, the submersible pump is arranged in the geothermal production well, and the recharging pressure pump is arranged in the geothermal recharging well.
Optionally, the high-pressure turbine generator set is a back pressure turbine, and the low-pressure turbine generator set is an ORC turbine generator set.
Optionally, the system further comprises a control system, wherein the control system comprises a first valve, a second valve and a third valve; the first valve is arranged on a connecting pipeline between the geothermal heat exchanger and the photo-thermal heat collection system; the second valve is arranged on a connecting pipeline between the geothermal heat exchanger and the low-pressure turbine generator set; the third valve is arranged on a connecting pipeline between the high-pressure turbine generator set and the low-pressure turbine generator set.
Optionally, the condensing system comprises a condenser and a working medium pump; the condenser is connected with the low-pressure turbine generator set through a pipeline; and the condenser condenses the exhaust gas of the power generation system and pumps the exhaust gas into the geothermal heat exchanger through the working medium pump.
Optionally, the system further comprises a cooling system, wherein the cooling system comprises a cooling tower and a cooling water pump; the condenser is connected with the cooling tower through the cooling water pump through a pipeline.
The invention has the following beneficial effects:
The combined cycle power generation system which utilizes solar energy and geothermal energy in parallel organically combines the solar energy power generation with the geothermal energy power generation, so that the thermal efficiency of the combined cycle power generation system is improved; when solar radiation is sufficient and available in the daytime, the geothermal energy and the solar energy are combined together to generate power, and when the solar energy is overcast or at night, the geothermal energy is adopted to generate power in a transitional mode, and the solar energy can also be adopted alone in the daytime to generate power, so that the continuous power generation of the combined cycle is realized.
Further, a first valve, a second valve and a third valve are adopted; the first valve is arranged on a connecting pipeline of the geothermal heat exchanger and the photo-thermal heat collection system; the second valve is arranged on a connecting pipeline of the geothermal heat exchanger and the low-pressure turbine generator set; the third valve is arranged on a connecting pipeline of the high-pressure turbine generator set and the low-pressure turbine generator set. When the illumination is sufficient in daytime, the second valve is kept closed, the first valve and the third valve are opened, the system realizes a complete high-pressure and low-pressure combined operation mode, and geothermal energy and solar energy are fully utilized to generate electricity. When the conditions of insufficient solar radiation at night, cloudy days and the like are met, the second valve is gradually opened, the first valve and the third valve are gradually closed, the system is stably transited to a low-voltage unit operation mode, geothermal energy is adopted for power generation, continuous and stable power output and slow load change are realized, and the influence of load interruption or abrupt change on a power grid is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic diagram of the principle and structure of the present invention;
Fig. 2 is a schematic structural diagram of an embodiment of the present invention.
1-Geothermal production wells; 2-a cyclone sand remover; 3-geothermal heat exchanger; 4-geothermal tail water filter; 5-recharging a pressurizing pump; 6-geothermal recharging well; 7-a photo-thermal heat collection system; 8-a high-pressure turbine generator set; 9-a low pressure turbine generator set; a 10-condenser; 11-working medium pump; 12-a cooling tower; 13-a cooling water pump; 14-a submersible pump; 15-a first valve; 16-a second valve; 17-third valve.
Description of the embodiments
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a schematic structural diagram of the principle of the present invention, and fig. 2 is a schematic structural diagram of an embodiment of the present invention, as shown in fig. 1 and 2:
A geothermal photo-thermal composite continuous power generation system comprises a geothermal water circulation system, a photo-thermal heat collection system 7, a power generation system and a condensation system; the geothermal water circulation system is connected with the photo-thermal heat collection system 7, and working medium provides energy for the power generation system to generate power through the geothermal water circulation system and/or the photo-thermal heat collection system 7; the power generation system is connected with the condensation system, and the condensation system condenses the exhaust gas of the power generation system and sends the exhaust gas into the geothermal water circulation system.
The geothermal water circulation system comprises a submersible pump 14, a geothermal production well 1, a cyclone sand remover 2, a geothermal heat exchanger 3, a geothermal tail water filter 4, a recharging pressure pump 5 and a geothermal recharging well 6.
The geothermal fluid in the geothermal production well 1 is extracted by the submersible pump 14, is desandized by the cyclone desanding device 2 and enters the geothermal heat exchanger 3, the geothermal fluid in the geothermal heat exchanger 3 is transferred to the low-boiling-point circulating working medium through heat exchange, and the cooled geothermal fluid is filtered by the geothermal tail water filter 4 and then is sent into the geothermal recharging well 6 by the recharging pressure pump 5.
Wherein the geothermal fluid comprises geothermal steam type fluid, geothermal steam-water mixed type fluid or geothermal hot water type fluid. The circulating medium adopts a low-boiling point working medium which comprises a single organic working medium, a multi-element organic working medium, carbon dioxide and the like.
The geothermal heat exchanger 3 can adopt a mode of circulating working medium running tube pass and geothermal water running shell pass or a mode of circulating working medium running shell pass and geothermal water running tube pass.
The power generation system comprises a high-pressure turbine generator set 8, a first power generator, a low-pressure turbine generator set 9 and a second power generator;
The photo-thermal heat collection system 7, the high-pressure turbine generator set 8 and the first generator are sequentially connected;
The geothermal water circulation system, the low-pressure turbine generator set 9 and the second generator are connected in sequence;
the high-pressure turbine generator set 8 is connected with the low-pressure turbine generator set 9, and the low-pressure turbine generator set 9 is connected with the condensing system.
The geothermal heat exchanger 3 circulating working medium outlet is connected with the circulating working medium inlet of the photo-thermal heat collection system 7 through a pipeline, the high-boiling-point circulating working medium outlet of the photo-thermal heat collection system 7 is sequentially connected with the high-pressure turbine generator set 8 and the low-pressure turbine generator set 9, the steam exhaust outlet of the low-pressure turbine generator set 9 is connected with the condenser 10 through a pipeline, the liquid working medium outlet of the condenser 10 is connected with the circulating working medium inlet of the geothermal heat exchanger 3 through a low-temperature working medium loop pipeline, a working medium pump 11 is arranged on the low-temperature working medium loop pipeline, the high-pressure turbine generator set 8 is connected with the first generator, the low-pressure turbine generator set 9 is connected with the second generator, the geothermal heat exchanger 3 is connected with the low-pressure turbine generator set 9 through a pipeline, the cooling water inlet of the condenser 10 is connected with the water outlet of the cooling tower 12 through a pipeline, and the water inlet of the cooling tower 12 is connected with the cooling water outlet pipeline of the condenser 10 through a cooling water pump 13, wherein the high-pressure turbine generator set 8 adopts a back-pressure turbine.
A first valve 15 is arranged between the circulating working medium outlet of the geothermal heat exchanger 3 and the circulating working medium inlet of the photo-thermal heat collection and exchange system 7, a second valve 16 is arranged between the circulating working medium outlet of the geothermal heat exchanger 3 and the steam inlet of the low-pressure turbine generator set 9, and a third valve 17 is arranged between the back pressure turbine and the low-pressure turbine generator set 9.
Valves are arranged on the pipeline loop of the geothermal water circulating system, the connecting pipeline of the photo-thermal heat collecting system, the connecting pipeline of the power generation system and the pipelines of the condensing system and the cooling system.
The low-parameter low-boiling point circulating working medium heated and gasified in the geothermal heat exchanger 3 enters a photo-thermal heat collection and exchange system 7, the collected solar radiation heat is further heated into high-parameter superheated gas, the high-parameter superheated gas is sequentially sent into a back pressure turbine and a low-pressure turbine generator set 9, a first generator and a second generator are respectively driven to generate power, the exhaust gas after working enters a condenser 10 and is cooled and liquefied into liquid working medium by circulating cooling water, and the liquid working medium is sent into the geothermal heat exchanger 3 again by a working medium pump 11, so that thermodynamic cycle is completed. The low-pressure turbine generator set 9 adopts an ORC turbine generator set, and the ORC turbine is used for realizing that Organic rankine cycle (ORC RANKINE CYCLE for short) taking low-boiling point Organic matters as working media enters the interior of the ORC turbine generator set to perform mechanical expansion work, so that the generator is driven to generate power.
The quantity of the geothermal production wells 1 is determined according to the minimum working medium flow required by the low-pressure turbine generator set and the heat source load required by the parameters; the number of the geothermal recharging wells 6 is determined according to the number of geothermal production wells and geothermal geological recharging conditions; the solar heat collector of the photo-thermal heat collection and exchange system 7 can be one or a combination of a plurality of groove type, tower type, butterfly type and linear Fresnel type.
The circulating cooling water of the cooling tower 12 is sent to the condenser 10 by the circulating cooling water pump 11 to cool the exhaust gas of the low-pressure turbine generator set 9, and is sent to the cooling tower 12 again to cool down, so that the cooling water circulation is completed. The cooling tower 12 can be replaced by an open water cooling system in the area where the surface water source is sufficient and the utilization is allowed, and an air cooling system in the area where the water is deficient or arid.
When solar energy radiation is sufficient and available in the daytime, the second valve 16 of the holding valve is closed, the first valve 15 and the third valve 17 are opened, the system realizes a complete combined operation mode of the high-pressure and low-pressure set, and geothermal energy and solar energy are fully utilized for generating power.
When insufficient solar radiation conditions such as night and cloudy days are met, the second valve 16 is gradually opened, the first valve 15 and the third valve 17 are gradually closed, the system is stably transited to a low-voltage unit operation mode, geothermal energy is adopted for power generation, continuous and stable power output and slow load change are realized, and the influence of load interruption or abrupt change on a power grid is avoided.
The invention organically combines the solar energy power generation and the geothermal energy power generation by utilizing the combined cycle power generation system with the solar energy and the geothermal energy in parallel, thereby improving the thermal efficiency of the combined cycle power generation system.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.