CN114607479B - Energy storage peak regulation system for recovering waste heat of thermal power plant thermodynamic system - Google Patents
Energy storage peak regulation system for recovering waste heat of thermal power plant thermodynamic system Download PDFInfo
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- CN114607479B CN114607479B CN202210265830.1A CN202210265830A CN114607479B CN 114607479 B CN114607479 B CN 114607479B CN 202210265830 A CN202210265830 A CN 202210265830A CN 114607479 B CN114607479 B CN 114607479B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 34
- 239000002918 waste heat Substances 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 268
- 238000005338 heat storage Methods 0.000 claims abstract description 108
- 238000010521 absorption reaction Methods 0.000 claims abstract description 37
- 238000010438 heat treatment Methods 0.000 claims description 14
- 239000006096 absorbing agent Substances 0.000 claims description 11
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 claims description 4
- 238000000354 decomposition reaction Methods 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 4
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 claims 22
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 20
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000010248 power generation Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
Classifications
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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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
- F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
- F25B15/025—Liquid transfer means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/24—Storage receiver heat
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Power Engineering (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The application provides an energy storage peak shaving system for recovering waste heat of a thermal power plant thermodynamic system, which comprises the following components: the heat-absorbing type heat pump comprises a heat-absorbing type heat pump, a first heat storage device and a second heat storage device, wherein the water inlet end of the heat-absorbing type heat pump is connected with the condensed water outlet end of the condenser; the first heat storage device is electrically connected with a generator in the thermodynamic system, and the water inlet end of the first heat storage device is connected with the water outlet end of the heat absorption heat pump; the second heat storage device is electrically connected with the generator, the water inlet end of the second heat storage device is connected with the water outlet end of the first heat storage device, the steam outlet end of the second heat storage device is connected with the steam inlet end of the steam turbine in the thermodynamic system, and compared with the related technology, the application has the advantages that: the energy storage peak regulation system is coupled with the heat absorption type heat pump, the first heat storage device and the second heat storage device, so that the waste heat of the condenser and the redundant electric quantity of the thermodynamic system are fully utilized, and the flexible peak regulation and frequency modulation of the thermal power plant are realized.
Description
Technical Field
The application relates to the technical field of waste heat recovery, in particular to an energy storage peak shaving system for recovering waste heat of a thermal power plant thermodynamic system.
Background
Because the difference of power consumption demands for the generated energy of thermal power plant can't match the power consumption demand completely, lead to the electric quantity not enough or the electric quantity is excessive, consequently partial thermal power plant carries out peak regulation frequency modulation through energy storage.
In the thermodynamic system of the thermal power plant, the condenser is a heat exchanger for condensing the exhaust steam of the steam turbine into water, and can also establish vacuum and maintain vacuum at the steam outlet end of the steam turbine, but the use of the condenser causes larger heat loss, so that the waste heat of the condenser and the redundant electric quantity of the thermodynamic system are considered to be utilized for energy storage, and the peak regulation and frequency modulation of the thermal power plant are ensured.
Disclosure of Invention
The present application aims to solve at least one of the technical problems in the related art to some extent.
Therefore, the application aims to provide an energy storage peak shaving system for recovering waste heat of a thermal power plant thermodynamic system.
In order to achieve the above purpose, the energy storage peak shaving system for recovering waste heat of a thermal power plant thermodynamic system provided by the application comprises: the heat absorption type heat pump comprises a heat absorption type heat pump, wherein a first heat exchange end of the heat absorption type heat pump is connected in parallel with a condensation passage of a condenser in the thermodynamic system, a second heat exchange end of the heat absorption type heat pump is connected in parallel with a circulation passage of the condenser, and a water inlet end of the heat absorption type heat pump is connected with a condensed water outlet end of the condenser; the first heat storage device is electrically connected with a generator in the thermodynamic system, and the water inlet end of the first heat storage device is connected with the water outlet end of the heat absorption heat pump; the second heat storage device is electrically connected with the generator, the water inlet end of the second heat storage device is connected with the water outlet end of the first heat storage device, and the steam outlet end of the second heat storage device is connected with the steam inlet end of a steam turbine in the thermodynamic system.
Optionally, the first heat storage device includes: a first regenerator; a first thermal storage medium disposed within the first thermal storage chamber; the water inlet end of the first heat exchange pump is connected with the bottom of the first regenerator; the water inlet end of the first electric heater is connected with the water outlet end of the first heat exchange pump, and the water outlet end of the first electric heater is connected with the top of the first regenerator; the water inlet end of the first heat exchange tube is connected with the water outlet end of the heat absorption type heat pump, and the water outlet end of the first heat exchange tube passes through the first heat storage chamber and then is connected with the water inlet end of the second heat storage device.
Optionally, the melting point of the first thermal storage medium is less than 90 degrees.
Optionally, the second heat storage device includes: a second regenerator; a second thermal storage medium disposed within the second thermal storage chamber; the water inlet end of the second heat exchange pump is connected with the bottom of the second regenerator; the second electric heater is electrically connected with the generator, the water inlet end of the second electric heater is connected with the water outlet end of the second heat exchange pump, and the water outlet end of the second electric heater is connected with the top of the second regenerator; the water inlet end of the second heat exchange tube is connected with the water outlet end of the first heat storage device, and the steam outlet end of the second heat exchange tube passes through the second heat storage chamber and then is connected with the high-pressure steam inlet end of the steam turbine.
Optionally, the decomposition temperature of the second thermal storage medium is not less than 600 degrees.
Optionally, the heat absorption heat pump includes: generator, evaporator, absorber and condenser; the steam inlet end of the generator is connected with the low-pressure steam outlet end of the steam turbine, a first valve is arranged between the steam inlet end of the generator and the low-pressure steam outlet end of the steam turbine, and the water outlet end of the generator is connected with the condensed water outlet end of the condenser; the water inlet end of the evaporator is connected with the circulating water outlet end of the condenser, a second valve is arranged between the water inlet end of the evaporator and the circulating water outlet end of the condenser, the water outlet end of the evaporator is connected with the circulating water inlet end of the condenser, and a third valve is arranged between the water outlet end of the evaporator and the circulating water inlet end of the condenser; the water inlet end of the absorber is connected with the condensed water outlet end of the condenser, and a fourth valve is arranged between the water inlet end of the absorber and the condensed water outlet end of the condenser; the water outlet end of the condenser is connected with the water inlet end of the first heat storage device.
Optionally, the energy storage peak shaving system further includes: the steam inlet end of the deaerator is respectively connected with the high-pressure steam outlet end of the steam turbine and the medium-pressure steam outlet end of the steam turbine, and the water inlet end of the deaerator is respectively connected with the condensed water outlet end of the condenser and the water outlet end of the first heat storage device; the water inlet end of the first water feeding pump is connected with the water outlet end of the deaerator, the water outlet end of the first water feeding pump is respectively connected with the water inlet end of the boiler in the thermodynamic system and the water inlet end of the second heat storage device, and a fifth valve is arranged between the water outlet end of the first water feeding pump and the water inlet end of the second heat storage device.
Optionally, the energy storage peak shaving system further includes: the water inlet end of the second water feeding pump is connected with the condensed water outlet end of the condenser, and the water outlet end of the second water feeding pump is respectively connected with the water inlet end of the heat absorption heat pump and the water inlet end of the deaerator.
Optionally, the energy storage peak shaving system further includes: the steam inlet end of the high-pressure heater group is respectively connected with the high-pressure steam outlet end of the steam turbine and the medium-pressure steam outlet end of the steam turbine, the steam outlet end of the high-pressure heater group is connected with the steam inlet end of the deaerator, the water inlet end of the high-pressure heater group is connected with the water outlet end of the first water supply pump, and the water outlet end of the high-pressure heater group is connected with the water inlet end of the boiler.
Optionally, the energy storage peak shaving system further includes: the low-pressure heater group, the steam inlet end of low-pressure heater group with the well steam outlet end of steam turbine reaches the low-pressure steam outlet end of steam turbine links to each other respectively, the steam outlet end of low-pressure heater group with the comdenstion water outlet end of condenser links to each other, the water inlet end of low-pressure heater group with the water outlet end of second feed pump links to each other, the water outlet end of low-pressure heater group with the water inlet end of deaerator links to each other.
By adopting the technical scheme, the application has the following advantages compared with the related technology:
the energy storage peak regulation system fully utilizes the waste heat of the condenser and the redundant electric quantity of the thermodynamic system through the coupling of the heat absorption type heat pump, the first heat storage device and the second heat storage device, realizes flexible peak regulation and frequency modulation of the thermal power plant, and meets the electricity demand;
simultaneously, the vacuum degree of the condenser is effectively improved, and the outlet exhaust pressure of the steam turbine is reduced, so that the output efficiency of the steam turbine is improved;
and the energy loss of a thermodynamic system is reduced, and the power generation cost is reduced.
Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic diagram of an energy storage peak shaving system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a first heat storage device in an energy storage peak shaving system according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a second heat storage device in the energy storage peak shaving system according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an endothermic heat pump in an energy storage peak shaving system according to an embodiment of the present application;
as shown in the figure: 1. the boiler comprises a boiler, 2, a steam turbine, 3, a generator, 4, a condenser, 5, an endothermic heat pump, 6, a first heat storage device, 7, a first heat storage chamber, 8, a first heat storage medium, 9, a first heat exchange pump, 10, a first electric heater, 11, a first heat exchange tube, 12, a second heat storage device, 13, a second heat storage chamber, 14, a second heat storage medium, 15, a second heat exchange pump, 16, a second electric heater, 17, a second heat exchange tube, 18, a generator, 19, an evaporator, 20, an absorber, 21, a condenser, 22, a deaerator, 23, a first water supply pump, 24, a second water supply pump, 25, a high-pressure heater group, 26, a low-pressure heater group, 27, a first valve, 28, a second valve, 29, a third valve, 30, a fourth valve, 31, a fifth valve, 32 and a sixth valve.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application. On the contrary, the embodiments of the application include all alternatives, modifications and equivalents as may be included within the spirit and scope of the appended claims.
In the related embodiment of the application, the thermodynamic system comprises a boiler 1, a steam turbine 2, a generator 3 and a condenser 4, wherein the steam outlet end of the boiler 1 is connected with the steam inlet end of the steam turbine 2, the steam outlet end of the steam turbine 2 is connected with the steam inlet end of the condenser 4, and the condensed water outlet end of the condenser 4 is connected with the water inlet end of the boiler 1;
the circulating water inlet end of the condenser 4 is connected with external cooling water, and the circulating water outlet end of the condenser 4 is connected with an external water storage position, so that circulating water in the condenser 4 is realized, and the condenser 4 converts steam discharged by the steam turbine 2 into condensed water under the heat exchange effect of the circulating water; the output end of the steam turbine 2 is connected with the input end of the generator 3, and the generator 3 is driven by the steam turbine 2 to generate electricity.
When the condenser 4 converts steam into condensed water, the circulating water therein brings heat out, which causes more heat loss, and when the generated energy of the thermodynamic system is larger, the redundant electric quantity is not easy to store and cannot be fully utilized.
Therefore, in order to solve the above-mentioned technical problems, as shown in fig. 1, an embodiment of the present application provides an energy storage peak shaving system for recovering waste heat of a thermal power plant thermodynamic system, which includes a heat absorption heat pump 5, a first heat storage device 6 and a second heat storage device 12, wherein a first heat exchange end of the heat absorption heat pump 5 is connected in parallel to a condensation passage of a condenser 4 in the thermodynamic system, a second heat exchange end of the heat absorption heat pump 5 is connected in parallel to a circulation passage of the condenser 4, a water inlet end of the heat absorption heat pump 5 is connected with a condensed water outlet end of the condenser 4, the first heat storage device 6 is electrically connected with a generator 3 in the thermodynamic system, a water inlet end of the first heat storage device 6 is connected with a water outlet end of the heat absorption heat pump 5, the second heat storage device 12 is electrically connected with the generator 3, a water inlet end of the second heat storage device 12 is connected with a water outlet end of the first heat storage device 6, and a steam outlet end of the second heat storage device 12 is connected with a steam inlet end of a steam turbine 2 in the thermodynamic system.
It can be understood that during the electricity consumption valley period, the generated energy of the thermodynamic system has larger surplus, and the redundant electric energy is converted into heat energy by the first heat storage device 6 and the second heat storage device 12, so that energy storage is realized;
during the electricity consumption peak period, the generated energy of the thermodynamic system cannot meet the electricity consumption requirement, the heat absorption heat pump 5 takes part of steam of the thermodynamic system as a high-temperature heat source, takes part of circulating water of the condenser 4 as a low-temperature heat source, utilizes the high-temperature heat source and the low-temperature heat source to heat condensed water discharged by the condenser 4 into high-temperature water, and sequentially heats the high-temperature water through the first heat storage device 6 and the second heat storage device 12, so that the high-temperature water is converted into high-temperature high-pressure steam which can be directly used by the steam turbine 2, the conversion of heat energy into electric energy is realized, the power generation efficiency of the thermodynamic system is effectively improved, and the electricity consumption requirement during the peak period is met;
the energy storage peak regulation system fully utilizes the waste heat of the condenser 4 and the redundant electric quantity of the thermodynamic system through the coupling of the heat absorption heat pump 5, the first heat storage device 6 and the second heat storage device 12, realizes flexible peak regulation and frequency modulation of the thermal power plant, and meets the electricity demand;
simultaneously, the vacuum degree of the condenser 4 is effectively improved, and the outlet exhaust pressure of the steam turbine 2 is reduced, so that the output efficiency of the steam turbine 2 is improved;
and the energy loss of a thermodynamic system is reduced, and the power generation cost is reduced.
As shown in fig. 2, in some embodiments, the first heat storage device 6 includes a first heat storage chamber 7, a first heat storage medium 8, a first heat exchange pump 9, a first electric heater 10, and a first heat exchange tube 11, where the first heat storage medium 8 is disposed in the first heat storage chamber 7, the water inlet end of the first heat exchange pump 9 is connected to the bottom of the first heat storage chamber 7, the first electric heater 10 is electrically connected to the generator 3, the water inlet end of the first electric heater 10 is connected to the water outlet end of the first heat exchange pump 9, the water outlet end of the first electric heater 10 is connected to the top of the first heat storage chamber 7, the water inlet end of the first heat exchange tube 11 is connected to the water outlet end of the heat absorption heat pump 5, and the water outlet end of the first heat exchange tube 11 is connected to the water inlet end of the second heat storage device 12 after passing through the first heat storage chamber 7.
It will be appreciated that during the low electricity consumption period, the generated energy of the thermodynamic system has a larger surplus, the first heat exchange pump 9 conveys the first heat storage medium 8 at the bottom of the first heat storage chamber 7 to the first electric heater 10, the first electric heater 10 heats the first heat storage medium 8 by using the surplus electric energy of the thermodynamic system, and the heated first heat storage medium 8 is returned to the first heat storage chamber 7 from the top of the first heat storage chamber 7 under the conveyance of the first heat exchange pump 9. Therefore, through the continuous conveying of the first heat exchange pump 9 and the continuous heating of the first electric heater 10, the conversion from electric energy to heat energy is realized, and the heat is stored in the first heat storage medium 8;
during the electricity consumption peak period, the generated energy of the thermodynamic system cannot meet the electricity consumption requirement, the high-temperature water discharged from the water outlet end of the heat absorption heat pump 5 flows through the first heat exchange tube 11, and the first heat storage medium 8 heats the high-temperature water in the first heat storage chamber 7, so that the primary heating of the high-temperature water is realized.
It should be noted that the power supply end of the first heat exchange pump 9 may be electrically connected to the generator 3, so as to supply power through the generator 3, or may supply power through an external power source.
In some embodiments, the melting point of the first thermal storage medium 8 is less than 90 degrees.
It is understood that the first heat storage medium 8 having a melting point less than 90 degrees can achieve heat storage and heating of high-temperature water, ensuring primary heating of the high-temperature water by the first heat storage device 6.
In some embodiments, the first thermal storage medium 8 may be a molten salt.
In some embodiments, the heated first thermal storage medium 8 is 180 degrees in temperature.
As shown in fig. 2, in some embodiments, the first heat exchange tubes 11 may be serpentine in distribution within the first regenerator 7 to ensure adequate heat exchange of the first thermal storage medium 8 with the high temperature water.
As shown in fig. 3, in some embodiments, the second heat storage device 12 includes a second regenerator 13, a second heat storage medium 14, a second heat exchange pump 15, a second electric heater 16, and a second heat exchange tube 17, where the second heat storage medium 14 is disposed in the second regenerator 13, the water inlet end of the second heat exchange pump 15 is connected to the bottom of the second regenerator 13, the second electric heater 16 is electrically connected to the generator 3, the water inlet end of the second electric heater 16 is connected to the water outlet end of the second heat exchange pump 15, the water outlet end of the second electric heater 16 is connected to the top of the second regenerator 13, the water inlet end of the second heat exchange tube 17 is connected to the water outlet end of the first heat storage device 6, and the steam outlet end of the second heat exchange tube 17 is connected to the high-pressure steam inlet end of the steam turbine 2 after passing through the second regenerator 13.
It will be appreciated that during the low electricity consumption period, the amount of electricity generated by the thermodynamic system has a larger surplus, the second heat exchange pump 15 transfers the second heat storage medium 14 at the bottom of the second regenerator 13 to the second electric heater 16, the second electric heater 16 heats the second heat storage medium 14 by using the surplus electricity of the thermodynamic system, and the heated second heat storage medium 14 is returned to the second regenerator 13 from the top of the second regenerator 13 under the transfer of the second heat exchange pump 15. Thereby, through the continuous transportation of the second heat exchange pump 15 and the continuous heating of the second electric heater 16, the conversion of electric energy into heat energy is realized, and the heat is stored in the second heat storage medium 14;
during the power consumption peak period, the generated energy of the thermodynamic system cannot meet the power consumption requirement, the high-temperature water discharged from the water outlet end of the first heat storage device 6 flows through the second heat exchange tube 17, and the second heat storage medium 14 heats the high-temperature water again in the second heat storage chamber 13, so that the secondary heating of the high-temperature water is realized, the high-temperature water is converted into high-temperature and high-pressure steam after the secondary heating, and the high-temperature water is directly used by the steam turbine 2, so that the conversion from heat energy to electric energy is realized.
It should be noted that the power supply end of the second heat exchange pump 15 may be electrically connected to the generator 3, so as to supply power through the generator 3, or may supply power through an external power source.
In some embodiments, the decomposition temperature of the second thermal storage medium 14 is not less than 600 degrees.
It will be appreciated that the second thermal storage medium 14 having a decomposition temperature of not less than 600 degrees enables the storage of heat and the secondary heating of high-temperature water, ensuring the conversion of high-temperature water into steam;
meanwhile, the cooperation of the first heat storage device 6 and the second heat storage device 12 ensures that the steam exhausted from the steam outlet end of the second heat storage device 12 can reach the standard required by the steam turbine 2, and meanwhile, the influence of the pinch point temperature on the heat exchange of a single heat storage medium and high temperature water can be overcome.
In some embodiments, the second thermal storage medium 14 may be a molten salt.
In some embodiments, the heated second thermal storage medium 14 temperature is 580 degrees.
As shown in fig. 3, in some embodiments, the second heat exchange tubes 17 may be serpentine in distribution within the second regenerator 13 to ensure adequate heat exchange of the second thermal storage medium 14 with the high temperature water.
As shown in fig. 1 and 4, in some embodiments, the heat absorption heat pump 5 includes a generator 18, an evaporator 19, an absorber 20, and a condenser 21, where the steam inlet end of the generator 18 is connected to the low pressure steam outlet end of the steam turbine 2, a first valve 27 is disposed between the steam inlet end of the generator 18 and the low pressure steam outlet end of the steam turbine 2, the water outlet end of the generator 18 is connected to the condensed water outlet end of the condenser 4, the water inlet end of the evaporator 19 is connected to the circulating water outlet end of the condenser 4, a second valve 28 is disposed between the water inlet end of the evaporator 19 and the circulating water outlet end of the condenser 4, the water outlet end of the evaporator 19 is connected to the circulating water inlet end of the condenser 4, a third valve 29 is disposed between the water inlet end of the absorber 20 and the condensed water outlet end of the condenser 4, a fourth valve 30 is disposed between the water inlet end of the absorber 20 and the water outlet end of the condenser 4, and the water outlet end of the condenser 21 is connected to the water inlet end of the heat storage device 6.
It can be understood that during the electricity consumption low-valley period, the generated energy of the thermodynamic system has larger surplus, the first valve 27, the second valve 28, the third valve 29 and the fourth valve 30 are all in a closed state, the condenser 4 converts the steam discharged by the steam turbine 2 into condensed water, and the condensed water is returned to the boiler 1 so as to facilitate the reuse of the steam turbine 2;
during the electricity consumption peak period, the generated energy of the thermodynamic system cannot meet the electricity consumption requirement, the first valve 27, the second valve 28, the third valve 29 and the fourth valve 30 are all opened, part of steam of the thermodynamic system enters the generator 18 and is subjected to heat exchange and cooling, cooled water enters the boiler 1 from the condensate water outlet end of the condenser 4, so that the heat absorption heat pump 5 takes part of steam of the thermodynamic system as a high-temperature heat source, part of circulating water of the condenser 4 enters the evaporator 19 and is subjected to heat exchange and cooling, cooled water enters the condenser 4 and is recycled, so that the heat absorption heat pump 5 takes part of circulating water of the condenser 4 as a low-temperature heat source, and part of condensate water at the water outlet end of the condenser 4 is heated to be high-temperature water when flowing through the absorber 20 and the condenser 21, thereby realizing the waste heat utilization of the condenser 4 and ensuring the conversion of heat energy to electric energy.
In some embodiments, the high temperature water heated by the heat absorption heat pump 5 may be 90 degrees or more.
As shown in fig. 1, in some embodiments, the energy storage peak shaving system further includes a deaerator 22 and a first water supply pump 23, the steam inlet end of the deaerator 22 is connected to the high-pressure steam outlet end of the steam turbine 2 and the medium-pressure steam outlet end of the steam turbine 2, the water inlet end of the deaerator 22 is connected to the condensed water outlet end of the condenser 4 and the water outlet end of the first heat storage device 6, the water inlet end of the first water supply pump 23 is connected to the water outlet end of the deaerator 22, the water outlet end of the first water supply pump 23 is connected to the water inlet end of the boiler 1 and the water inlet end of the second heat storage device 12 in the thermodynamic system, and a fifth valve 31 is disposed between the water outlet end of the first water supply pump 23 and the water inlet end of the second heat storage device 12.
It can be understood that the deaerator 22 directly deaerates the high-pressure steam outlet and the medium-pressure steam outlet of the steam turbine 2, and indirectly deaerates the low-pressure steam outlet of the steam turbine 2 through the condenser 4 and the first heat storage device 6, so that corrosion of air in water to equipment, pipelines and the like in a thermodynamic system and influence on heat exchange capacity of the equipment such as the boiler 1 and the second heat storage device 12 are avoided, the service life of the thermodynamic system is prolonged, and the power generation efficiency of the thermodynamic system is improved;
meanwhile, under the delivery of the first water supply pump 23, part of high-temperature water enters the boiler 1, and the rest of high-temperature water enters the second heat storage device 12 for secondary heating, so that the secondary heating of the high-temperature water is ensured while the water circulation in the thermodynamic system is ensured through the arrangement of the first water supply pump 23;
the fifth valve 31 is closed during the electricity consumption peak period, and the fifth valve 31 is opened during the electricity consumption valley period.
In some embodiments, the high temperature water enters the deaerator 22 after being heated in the first thermal storage device 6 to a temperature near the saturation temperature within the deaerator 22.
As shown in fig. 1, in some embodiments, a sixth valve 32 is disposed between the steam outlet end of the second heat exchange tube 17 and the high pressure steam inlet end of the steam turbine 2, and it is understood that the sixth valve 32 is closed during the low electricity consumption period and the sixth valve 32 is opened during the high electricity consumption period.
In some embodiments, the first valve 27, the second valve 28, the third valve 29, the fourth valve 30, the fifth valve 31, and the sixth valve 32 may each be solenoid-operated valves.
As shown in fig. 1, the steam turbine 2 includes a high-pressure cylinder, a medium-pressure cylinder, and a low-pressure cylinder, which are sequentially provided.
As shown in fig. 1, in some embodiments, the energy storage peak shaving system further includes a second water feed pump 24, where the water inlet end of the second water feed pump 24 is connected to the condensed water outlet end of the condenser 4, and the water outlet end of the second water feed pump 24 is connected to the water inlet end of the heat absorption heat pump 5 and the water inlet end of the deaerator 22, respectively.
Under the conveying action of the second water feed pump 24, part of condensed water enters the deaerator 22, and the rest of condensed water enters the heat absorption heat pump 5 and the first heat storage device 6 for heating, so that the heating of the condensed water in the heat absorption heat pump 5 and the primary heating in the first heat storage device 6 are ensured while the water circulation in the thermodynamic system is ensured through the arrangement of the second water feed pump 24.
As shown in fig. 1, in some embodiments, the energy storage peak shaving system further includes a high-pressure heater group 25, the steam inlet end of the high-pressure heater group 25 is connected to the high-pressure steam outlet end of the steam turbine 2 and the middle steam outlet end of the steam turbine 2, the steam outlet end of the high-pressure heater group 25 is connected to the steam inlet end of the deaerator 22, the water inlet end of the high-pressure heater group 25 is connected to the water outlet end of the first water supply pump 23, and the water outlet end of the high-pressure heater group 25 is connected to the water inlet end of the boiler 1.
It can be appreciated that the high-pressure heater group 25 heats the water entering the boiler 1 by utilizing the high-pressure steam outlet and the medium-pressure steam outlet of the steam turbine 2, so that the utilization rate of the waste heat and the power generation efficiency of the thermodynamic system are effectively improved.
As shown in fig. 1, the high-pressure heater group 25 includes three high-pressure heaters, and the three high-pressure heaters are disposed in this order.
As shown in fig. 1, in some embodiments, the energy storage peak shaving system further includes a low-pressure heater group 26, the steam inlet end of the low-pressure heater group 26 is connected to the middle steam outlet end of the steam turbine 2 and the low-pressure steam outlet end of the steam turbine 2, the steam outlet end of the low-pressure heater group 26 is connected to the condensed water outlet end of the condenser 4, the water inlet end of the low-pressure heater group 26 is connected to the water outlet end of the second water feeding pump 24, and the water outlet end of the low-pressure heater group 26 is connected to the water inlet end of the deaerator 22.
It can be appreciated that the low-pressure heater group 26 heats the condensed water entering the deaerator 22 by using the medium-pressure steam outlet and the low-pressure steam outlet of the steam turbine 2, so that the utilization rate of the waste heat and the power generation efficiency of the thermodynamic system are effectively improved.
As shown in fig. 1, the low-pressure heater group 26 includes three low-pressure heaters, and the three low-pressure heaters are disposed in sequence.
It should be noted that in the description of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (6)
1. An energy storage peak shaving system for recovering waste heat of a thermodynamic system of a thermal power plant, which is characterized by comprising:
the heat absorption type heat pump comprises a heat absorption type heat pump, wherein a first heat exchange end of the heat absorption type heat pump is connected in parallel with a condensation passage of a condenser in the thermodynamic system, a second heat exchange end of the heat absorption type heat pump is connected in parallel with a circulation passage of the condenser, and a water inlet end of the heat absorption type heat pump is connected with a condensed water outlet end of the condenser;
the first heat storage device is electrically connected with a generator in the thermodynamic system, and the water inlet end of the first heat storage device is connected with the water outlet end of the heat absorption heat pump;
the second heat storage device is electrically connected with the generator, the water inlet end of the second heat storage device is connected with the water outlet end of the first heat storage device, and the steam outlet end of the second heat storage device is connected with the steam inlet end of a steam turbine in the thermodynamic system;
wherein the first thermal storage device includes: the heat exchange device comprises a first heat accumulation chamber, a first heat accumulation medium, a first heat exchange pump, a first electric heater and a first heat exchange tube, wherein the first heat accumulation medium is arranged in the first heat accumulation chamber, the first heat accumulation medium is molten salt, the melting point of the first heat accumulation medium is smaller than 90 degrees, the water inlet end of the first heat exchange pump is connected with the bottom of the first heat accumulation chamber, the first electric heater is electrically connected with the generator, the water inlet end of the first electric heater is connected with the water outlet end of the first heat exchange pump, the water outlet end of the first electric heater is connected with the top of the first heat accumulation chamber, the water outlet end of the first heat exchange tube is connected with the water outlet end of the heat absorption heat pump, the water outlet end of the first heat exchange tube passes through the first heat accumulation chamber and then is connected with the water inlet end of the second heat accumulation device, and the first heat exchange tube is in serpentine distribution in the first heat accumulation chamber;
the second heat storage device includes: the heat exchange device comprises a second heat accumulation chamber, a second heat accumulation medium, a second heat exchange pump, a second electric heater and a second heat exchange tube, wherein the second heat accumulation medium is arranged in the second heat accumulation chamber, the second heat accumulation medium is molten salt, the decomposition temperature of the second heat accumulation medium is not less than 600 ℃, the water inlet end of the second heat exchange pump is connected with the bottom of the second heat accumulation chamber, the second electric heater is electrically connected with the generator, the water inlet end of the second electric heater is connected with the water outlet end of the second heat exchange pump, the water outlet end of the second electric heater is connected with the top of the second heat accumulation chamber, the water inlet end of the second heat exchange tube is connected with the water outlet end of the first heat accumulation device, the steam outlet end of the second heat exchange tube is connected with the high-pressure steam inlet end of the steam turbine after passing through the second heat accumulation chamber, and the second heat exchange tube is in a serpentine distribution in the second heat accumulation chamber;
the heat absorption type heat pump, the first heat storage device and the second heat storage device are used for sequentially heating condensed water of the condenser into high-temperature high-pressure steam.
2. The energy storage peaking system of claim 1, wherein the endothermic heat pump comprises: generator, evaporator, absorber and condenser;
the steam inlet end of the generator is connected with the low-pressure steam outlet end of the steam turbine, a first valve is arranged between the steam inlet end of the generator and the low-pressure steam outlet end of the steam turbine, and the water outlet end of the generator is connected with the condensed water outlet end of the condenser;
the water inlet end of the evaporator is connected with the circulating water outlet end of the condenser, a second valve is arranged between the water inlet end of the evaporator and the circulating water outlet end of the condenser, the water outlet end of the evaporator is connected with the circulating water inlet end of the condenser, and a third valve is arranged between the water outlet end of the evaporator and the circulating water inlet end of the condenser;
the water inlet end of the absorber is connected with the condensed water outlet end of the condenser, and a fourth valve is arranged between the water inlet end of the absorber and the condensed water outlet end of the condenser;
the water outlet end of the condenser is connected with the water inlet end of the first heat storage device.
3. The energy storage peak shaving system of claim 1, further comprising:
the steam inlet end of the deaerator is respectively connected with the high-pressure steam outlet end of the steam turbine and the medium-pressure steam outlet end of the steam turbine, and the water inlet end of the deaerator is respectively connected with the condensed water outlet end of the condenser and the water outlet end of the first heat storage device;
the water inlet end of the first water feeding pump is connected with the water outlet end of the deaerator, the water outlet end of the first water feeding pump is respectively connected with the water inlet end of the boiler in the thermodynamic system and the water inlet end of the second heat storage device, and a fifth valve is arranged between the water outlet end of the first water feeding pump and the water inlet end of the second heat storage device.
4. The energy storage peak shaver system according to claim 3, wherein the energy storage peak shaver system further comprises:
the water inlet end of the second water feeding pump is connected with the condensed water outlet end of the condenser, and the water outlet end of the second water feeding pump is respectively connected with the water inlet end of the heat absorption heat pump and the water inlet end of the deaerator.
5. The energy storage peak shaver system according to claim 4, wherein the energy storage peak shaver system further comprises:
the low-pressure heater group, the steam inlet end of low-pressure heater group with the well steam outlet end of steam turbine reaches the low-pressure steam outlet end of steam turbine links to each other respectively, the steam outlet end of low-pressure heater group with the comdenstion water outlet end of condenser links to each other, the water inlet end of low-pressure heater group with the water outlet end of second feed pump links to each other, the water outlet end of low-pressure heater group with the water inlet end of deaerator links to each other.
6. The energy storage peak shaver system according to claim 3, wherein the energy storage peak shaver system further comprises:
the steam inlet end of the high-pressure heater group is respectively connected with the high-pressure steam outlet end of the steam turbine and the medium-pressure steam outlet end of the steam turbine, the steam outlet end of the high-pressure heater group is connected with the steam inlet end of the deaerator, the water inlet end of the high-pressure heater group is connected with the water outlet end of the first water supply pump, and the water outlet end of the high-pressure heater group is connected with the water inlet end of the boiler.
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Application publication date: 20220610 Assignee: HUANENG INTERNATIONAL POWER CO.,LTD. DEZHOU POWER PLANT Assignor: Xi'an Thermal Power Research Institute Co.,Ltd. Contract record no.: X2023980054524 Denomination of invention: An energy storage and peak shaving system for recovering waste heat from thermal systems in thermal power plants Granted publication date: 20231107 License type: Common License Record date: 20231229 |