A kind of the solar energy optical-thermal heat reservoir and method of cogeneration units depth peak regulationTechnical field
The invention belongs to electric power energy technical field more particularly to a kind of solar energies of cogeneration units depth peak regulationHot heat reservoir and method.
Background technique
In recent years, the exhaustion of the increase of energy demand and fossil energy, so that renewable resource the relevant technologies are quickly grown.In concerned power, wind-powered electricity generation, photovoltaic continued, quickly development, still, also generally existing technical problem, such as serious abandoningWind abandons optical issue.And cause abandonment, abandon optical issue a principal element be wind-powered electricity generation, photovoltaic digestion capability limitation.It dissolves intoIt is increasingly severe to restrict domestic wind-powered electricity generation, the key factor of photovoltaic development and situation.Wind-powered electricity generation, photovoltaic consumption problem are cracked, it can be from mentioningLiter power supply peak modulation capacity, adjustment wind-powered electricity generation, photovoltaic layout, reinforcement power grid mutually helps and many aspects such as load side management take measures.The especially more serious the Northeast of abandonment, flexibility power supply relative shortage improve the flexibility of part fired power generating unit, deep-cut itDepth peak regulation potentiality become the crucial behave for improving peak-load regulating and new energy digestion capability most realistic meaning.
In addition, in China three northern areas of China, cogeneration units than great, water power, pure condensate unit etc. can peaking power source it is rare,Peak regulation difficulty has become in operation of power networks distinct issues the most.By taking Northeast China Power Grid as an example, in current power supply architecture, fireElectricity accounts for the 65% of total installed capacity, and wind-powered electricity generation accounts for the 25% of total installed capacity, and nuclear power unit is also putting into operation successively.Heating Period in winter, thermoelectricity connectionIt producing unit working capacity and accounts for the 70% of thermal power unit operation total capacity, cogeneration units are run according to " electricity determining by heat " mode,Peak modulation capacity is only 10% or so, so that wind electricity digestion problem is more prominent.Above situation results in Northeast China Power Grid peak regulation difficulty,Produce three serious consequences: first is that power grid valley power balance is abnormal difficult, scheduling pressure is huge, increases power grid security fortuneRow risk；Second is that the ability wretched insufficiency of the new energy such as power grid consumption wind-powered electricity generation, photoelectricity and nuclear power, abandonment problem is very prominent, noConducive to regional energy-saving and emission-reduction and energy resource structure transition and upgrade；Third is that contradiction is prominent between peak load regulation network and cogeneration units heat supplyOut, resident's heat supply in winter safety is influenced, there is the risk for causing livelihood issues.
Northeast Supervision Bureau, National Energy Board issues " Tohoku Electric Power peak regulation assisted hatching supervisory method (tentative) " (northeastPrison energy market [2014] 374) and implemented on October 1st, 2014.In March, 2016, energy supervision office in northeast issued " < northeastPower peak regulation assisted hatching supervisory method (tentative) > supplementary provisions ", under northeast Supervision Bureau, National Energy Board's in December, 2018Send out " Tohoku Electric Power assisted hatching operation rule (provisional) " (the northeast market Jian Neng [2018] 220), it is specified that in paidPeak regulation benchmark and peak regulation compensation class are revised, and most obvious one variation is to have pulled open common peak regulation and depth peak regulationCompensation gap.
National policy is just gradually increasing the compensation dynamics to fired power generating unit peak modulation capacity；Fired power generating unit is required to carry out simultaneouslyWhen peak load regulation network, the heating quality for guaranteeing resident is had to, this just further increases the difficulty of fired power generating unit peak regulation.CauseHow this, effectively carry out fired power generating unit power peak regulation, and to heat supply network load peak load shifting, thus guarantee the quality of heat supply, it is rightIt is to need most important problem urgently to be resolved for thermal power plant.Accelerate energy technology innovation, it is latent to excavate coal unit peak regulationPower promotes China's thermoelectricity operational flexibility, improves peak-load regulating and new energy digestion capability comprehensively, give full play to thermoelectricity flexibilityTransformation is improving peak-load regulating ability and is establishing cleaning low-carbon, safe and efficient modern energy system, promotes China's energy resource structureAdjustment.It is the important content that China promotes high efficiency smart clean electric power system Construction.
In the prior art, thermoelectricity flexibility renovation technique is climbed mainly for depth peak regulation (low electric load operation), raisingRate, rapid starting/stopping, fuel flexibility etc..Corresponding solution has:
1. thermoelectricity decouples: by increasing large-scale heat reservoir, participating in supplying by heat-storing device heat in the peak regulation difficult periodHeat does not play heating power shortage；There is the period storage of allowance rich or new energy heat in peak regulation.Mainly there is heat-accumulator tank scheme, electricityHeat boiler, high and low pressure bypass steam extraction pressure and temperature reducing, and low pressure (LP) cylinder lacks vapour no-load run etc..
2. underload denitration: feed water by-pass, gas bypass, economizer classification, economizer hot water recirculating technique etc..
3. the control strategy of optimizing combustor and feedwater flow improves Load Regulation rate: ion burner, flame monitoringDevice, coal pulverizer transformation etc..
4. increasing steady combustion equipment: non-oil ignition, tiny-oil ignition etc..
5. steam turbine is transformed: turbine by pass pressure and temperature reducing, low pressure (LP) cylinder transformation etc..
Although the above technology can reach certain Peak Load Adjustment, the problem of by safeties such as boiler, steam turbines, it is unable to reachThe purpose of depth peak regulation.For example, power load is only carried out internal consumption by electric boiler technology, it is then converted to heat supply, is not savedEnergy；Underrun will cause the discharge beyond standards of the system equipments such as desulphurization denitration.Meanwhile existing extraction for heat supply power plant, peak regulationThere is also the problems for heat waster or heat supply deficiency when system progress power peak regulation.
Summary of the invention
The object of the present invention is to provide a kind of solar energy optical-thermal heat reservoir of cogeneration units depth peak regulation and method,Guarantee unit continuous and steady operation, on the basis of increasing new energy consumption, realizes depth peak regulation.
The present invention provides a kind of solar energy optical-thermal heat reservoirs of cogeneration units depth peak regulation, including are set to thermoelectricitySolar energy hot heater and heat accumulation water pot in coproduction unit, the cogeneration units include intermediate pressure cylinder and heat supply network heatingDevice, the heat accumulation water pot include lower part cooling water outlet and top hot water inlet；
The water inlet and heat exchangers for district heating of the lower part cooling water outlet of the heat accumulation water pot and the solar energy hot heaterWater inlet connection, for feeding heat supply network recirculated water cold water to the solar energy hot heater and heat exchangers for district heating；
The water outlet and heat exchangers for district heating of the top hot water inlet of the heat accumulation water pot and the solar energy hot heaterWater outlet connection, for by the solar energy hot heater and heat exchangers for district heating heating after water store to the water storageTank top；
The heat accumulation water pot is connect with a pipe network, feeds hot water for Xiang Yici pipe network；
Medium pressure cylinder is connect by exhaust line with the steam inlet of the heat exchangers for district heating, for being heated by steamHeat supply network recirculated water cold water；
The solar energy hot heater is used to heat heat supply network recirculated water cold water, underheat in the non-depth peak regulation periodHeat supply network recirculated water cold water is heated by extracting intermediate pressure cylinder steam discharge steam, by heat supply network heat exchanger in part, and the water after heating is stored upThere are in the heat accumulation water pot；
The heat accumulation water pot is used to that the hot water in heat accumulation water pot to be supplied to a pipe network in the depth peak regulation period, to reduceThe heat supply steam extraction amount of intermediate pressure cylinder steam discharge realizes thermoelectricity decoupling.
Further, the water inlet of the solar energy hot heater and heat exchangers for district heating is respectively provided with adjusting water inletThe solar energy optical-thermal system circulation water pump and circulation pump of heat-supply network of flow.
Further, the heat accumulation water pot selects normal pressure type mesolimnion heat storage can.
Further, the top and lower part of the heat accumulation water pot are equipped with thermoclinic in heat accumulation water pot for adjusting and controllingStablize water distributor.
Further, the cogeneration units further include low pressure (LP) cylinder, condenser, oxygen-eliminating device, low-pressure heater, precision processingDevice, the low pressure (LP) cylinder are connect with medium pressure cylinder and condenser, the condenser, polisher, low-pressure heater, oxygen-eliminating device according toSecondary connection, the oxygen-eliminating device are connect with the heat exchangers for district heating.
The present invention also provides a kind of methods of cogeneration units depth peak regulation, comprising:
Solar energy hot heater and heat accumulation water pot are set in cogeneration units；
In the non-depth peak regulation period, heat supply network recirculated water cold water, underheat part are heated using solar energy hot heaterIt extracts unit intermediate pressure cylinder steam discharge steam to feed in heat supply network heat exchanger, heat supply network recirculated water cold water is heated by heat supply network heat exchanger, and willWater after heating is stored in heat accumulation water pot；
In the depth peak regulation period, according to the characteristic of cogeneration units, with the reduction of generated output, unit heating loadIt is corresponding to reduce, the hot water in heat accumulation water pot is supplied to a pipe network at this time, insufficient heating load is supplemented by heat accumulation water pot, realExisting thermoelectricity decoupling.
According to the above aspect of the present invention, pass through the solar energy optical-thermal heat reservoir and method of cogeneration units depth peak regulation, it canGuarantee unit continuous and steady operation, on the basis of increasing new energy consumption, realizes depth peak regulation.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,And can be implemented in accordance with the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention and the accompanying drawings.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the solar energy optical-thermal heat reservoir of cogeneration units depth peak regulation of the present invention.
Figure label:
1- intermediate pressure cylinder；2- low pressure (LP) cylinder；3- condenser；4- oxygen-eliminating device；5- low-pressure heater；6- polisher；7- heat supply network addsHot device；8- water distributor；9- heat accumulation water pot；Pipe network of 10-；11- solar energy hot heater；12- circulation pump of heat-supply network；13-Solar energy optical-thermal system circulation water pump.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement belowExample is not intended to limit the scope of the invention for illustrating the present invention.
Join shown in Fig. 1, present embodiments provide a kind of solar energy optical-thermal heat reservoir of cogeneration units depth peak regulation,Including intermediate pressure cylinder 1；Low pressure (LP) cylinder 2；Condenser 3；Oxygen-eliminating device 4；Low-pressure heater 5；Polisher 6；Heat exchangers for district heating 7；Water distributor8；Heat accumulation water pot 9；Pipe network 10；Solar energy hot heater 11；12- circulation pump of heat-supply network；13- solar energy hot systems followRing water pump.
Wherein, intermediate pressure cylinder 1 simultaneously be connected with 2 side of low pressure (LP) cylinder and 7 side of heat exchangers for district heating, 2 other side of low pressure (LP) cylinder with coagulate3 side of vapour device is connected；3 other side of condenser is connected with 6 side of polisher；6 other side of polisher and low-pressure heater 5 oneSide is connected；5 other side of low-pressure heater is connected with oxygen-eliminating device 4；1 steam discharge of intermediate pressure cylinder enters in heat exchangers for district heating 7, and passes through heatNet heater 7 is discharged into heat supply network is hydrophobic in oxygen-eliminating device 4, carries out the water of heat exchange by heat accumulation water pot 9 with 1 steam discharge of intermediate pressure cylinder (steam)It provides, therefore, heat exchangers for district heating 7 is connected with the lower part of heat accumulation water pot 9 and top simultaneously, in addition, solar energy hot heater 11Also it is connected simultaneously with the lower part of heat accumulation water pot 9 and top, when carrying out heat exchange, cold water is pumped into heat from 9 lower part of heat accumulation water pot simultaneouslyIn net heater 7 and solar energy hot heater 11, assignment of traffic can be adjusted by adjusting circulation revolution speed or setting flowValve is matched, and the present embodiment carries out assignment of traffic, In by circulation pump of heat-supply network 12 and solar energy optical-thermal system circulation water pumpBy heat exchangers for district heating 7 and solar energy hot heater after progress heat exchange in heat exchangers for district heating 7 and solar energy hot heater 1111 are discharged into the top of heat accumulation water pot 9；Water distributor 9 is set in the upper and lower part of heat accumulation water pot 9, for adjusting and controlling storageThermoclinic stabilization in hot-water cylinder 9；Heat accumulation water pot 9 is also connected with a pipe network 10.
The present embodiment in such a way that solar energy hot heater and heat accumulation water pot are set in cogeneration units system,In the period for needing not participate in depth peak regulation, the cold water of solar energy hot heater heating heat storage can lower part discharge, heating are utilizedInsufficient section can extract unit intermediate pressure cylinder steam discharge steam and be heated, and by the hot water storage after heating in heat accumulation water pot；In the period of depth peak regulation, the hot water in heat accumulation water pot is supplied to the primary net system of heat supply network by water pump, is made full use of with this non-The heat of peak regulation period storage realizes thermoelectricity decoupling so that the heat supply steam extraction amount of intermediate pressure cylinder steam discharge at this time be greatly decreased.
In order to reduce system investments and improve system safety in operation, the heat accumulation water pot 9 in the present embodiment selects normal pressureType mesolimnion heat storage can.At this point, cold and hot working medium can be stored in simultaneously in heat accumulation water pot 9, the design pressure of heat accumulation water pot 9 be it is micro- justPressure, it is preferred that institute's water storage temperature range is 70-98 DEG C in heat accumulation water pot 9, using the pressure of water at 98 DEG C of maximum water temperature as heat accumulationThe maximum of water pot 9 bears pressure value.
Preferably, present invention can apply to use the improved cogeneration units of micro oil ignition system.By to unitMicro oil ignition system transformation is completed, it can be achieved that boiler low load stable combustion.At this point, the ability of boiler itself underload continuous operation isIt, therefore, can be into using the solar energy optical-thermal heat reservoir and method of cogeneration units depth peak regulation of the invention close to the limitOne step reduces generation load and guarantees the continuous and steady operation of unit.The tiny-oil ignition combustion-stabilizing system reform is passed through to the present embodimentFor single unit afterwards, when single unit puts into operation, boiler meets minimum steady combustion load.Ensuring that low pressure (LP) cylinder 2 is minimum coolingUnder the premise of flow, average extraction steam for factories flow is considered, steam can be extracted by 1 steam discharge of intermediate pressure cylinder for heating heat accumulation water pot 9In cold water, come make up light application time it is inadequate when lead to photovoltaic heater heating amount insufficient section, when needing peak regulationWhen, 9 quantity of heat storage of heat accumulation water pot is preferentially used for heat supply, and heat demand insufficient section is added by 1 steam discharge of cogeneration units intermediate pressure cylinderHeat supply network return water direct heating solves, at this point, power generation load rate can be down to 25~35% under steam extraction operating condition, it is preferred that power generation is negativeLotus is 30%.
It in cogeneration units heat supply period, is instructed according to dispatching of power netwoks, carries out the depth peak regulation period, realize thermoelectricityDecoupling, according to the characteristic of cogeneration units, with the reduction of generated output, unit heat capacity is also accordingly reduced, to meetHeat supply network thermal load demands preferentially start exothermic process using heat accumulation water pot 9 and carry out heat release, i.e. the hot water on 9 top of heat accumulation water pot suppliesIt is used to a pipe network 10, heat supply insufficient section heats heat supply network return water direct heating by 1 steam discharge of cogeneration units intermediate pressure cylinderIt solves, realizes the decoupling of cogeneration units thermoelectricity, cogeneration units depth peak modulation capacity 10% can be improved.
The present invention in such a way that solar energy hot heater and hot water heat accumulation can system are set in fired power generating unit system,In the non-peak regulation period, heat supply network recirculated water cold water is heated using solar energy hot heater, underheat part can be extracted in unitCylinder pressure steam discharge steam heats heat supply network cold water by heat supply network heat exchanger, and the water after heating is stored in heat accumulation water pot, is needingHot water in heat accumulation water pot is supplied to the primary net system of heat supply network, realizes depth peak regulation, reduce simultaneously by the period for participating in depth peak regulationGeneration load and the continuous and steady operation for guaranteeing unit.During entire peak regulation, with solar energy optical-thermal heating technique and heatWater heat-storage technology promotes the ability of unit online peak regulation, has saved unit operation energy consumption, and has been effectively relieved and bought energy consumption clearlyPredicament.During entire peak regulation, with solar energy optical-thermal heating technique and hot water heat-storage technology, cogeneration of heat and power machine is improvedGroup online peak modulation capacity, has saved unit net coal consumption rate, the difficulty of clean energy resource consumption has been effectively relieved, and ensure that cleaning energyThe reasonable utilization in source.
The above is only a preferred embodiment of the present invention, it is not intended to restrict the invention, it is noted that for this skillFor the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is several improvement andModification, these improvements and modifications also should be regarded as protection scope of the present invention.