CN114704380B - Peak regulation power generation system and method of coal-fired unit coupled with thermochemical energy storage - Google Patents
Peak regulation power generation system and method of coal-fired unit coupled with thermochemical energy storage Download PDFInfo
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- 238000010248 power generation Methods 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000004146 energy storage Methods 0.000 title claims abstract description 31
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 129
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 128
- 238000005338 heat storage Methods 0.000 claims abstract description 106
- 230000005611 electricity Effects 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims abstract description 22
- 239000002918 waste heat Substances 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims description 47
- 229910052760 oxygen Inorganic materials 0.000 claims description 33
- 239000001301 oxygen Substances 0.000 claims description 33
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 32
- 230000033116 oxidation-reduction process Effects 0.000 claims description 31
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 229910020599 Co 3 O 4 Inorganic materials 0.000 claims description 3
- 230000005251 gamma ray Effects 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000007254 oxidation reaction Methods 0.000 abstract 1
- 238000006722 reduction reaction Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/24—Stationary reactors without moving elements inside
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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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
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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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
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
- F02C6/14—Gas-turbine plants having means for storing energy, e.g. for meeting peak loads
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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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
- F28D20/003—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using thermochemical reactions
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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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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Abstract
The invention discloses a peak shaving power generation system and method of a coal-fired unit coupled with thermochemical energy storage. The invention adopts the technical scheme that: when the power grid is in the electricity consumption valley period, partial power generated by the coal-fired unit is used for carrying out reduction reaction on the metal oxide to finish the heat storage process, so that the power of the peak regulation power generation system of the coal-fired unit is rapidly reduced; when the power grid is in the electricity consumption peak period, the metal oxide generates an oxidation reaction to complete an exothermic process so as to heat air at an inlet of the air turbine, so that the internet power of the peak shaving power generation system of the coal-fired unit is rapidly improved, and meanwhile, steam generated by the waste heat boiler can exhaust part of steam extracted from the steam turbine so as to assist in improving the output power of the peak shaving power generation system of the coal-fired unit. The invention can not only improve the deep peak regulation level of the peak regulation power generation system of the coal-fired unit, but also improve the rapid variable load capacity, and provide support for peak clipping and valley filling of the power grid, thereby improving the renewable energy consumption capacity of the power grid.
Description
Technical Field
The invention belongs to the technical field of generator sets, and particularly relates to a peak shaving power generation system and method of a coal-fired unit for coupling thermochemical energy storage.
Background
In recent years, the 'double carbon' target is put forward, the acceleration transformation and upgrading of the energy system in China are imperative, the installed capacity of renewable energy sources in the future can be increased in a larger scale, and the large-scale grid connection of the renewable energy sources brings unprecedented challenges to the stability of the power system. In order to improve the operation safety and the scheduling flexibility of the power grid, the coal-fired unit as the main power generation force at the present stage must bear more frequent ultra-low load deep peak regulation tasks, and meanwhile, the coal-fired unit must have the capacity of rapidly changing loads.
The traditional coal-fired unit is limited by load change and ultra-low load operation capability, so that the response power grid rapid load adding and subtracting capability and deep peak regulation performance are affected, and the power grid is limited to a certain extent in terms of renewable energy consumption capability.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a peak shaving power generation system and method for a coal-fired unit coupled with thermochemical energy storage, which are used for coupling the coal-fired unit with thermochemical energy storage, and effectively improving the deep peak shaving level and the rapid load changing capability of the peak shaving power generation system of the coal-fired unit by utilizing the advantages of large thermochemical energy storage density, wide working temperature range and the like.
For this purpose, the invention adopts a technical scheme that: the peak shaving power generation system of the coal-fired unit for coupling thermochemical energy storage comprises a coal-fired power generator, a controller, an output line, a first switch, a first transformer, a power grid, a second switch, a second transformer, a third switch, a third transformer, a redox heat storage reactor, an electric heater, a supporting body and a turbine generator;
the coal-fired generator is connected with a power grid through a first switch, a first transformer and an output line;
the output line is connected with the electric heater through a second switch and a second transformer, and is connected with the turbine generator through a third transformer and a third switch;
the redox heat storage reactor is divided into a plurality of redox heat storage reaction cells, an electric heater, a support body, a metal oxide, a compressed air quantity control device and an electric heater control device are arranged in each redox heat storage reaction cell, the support body is used for supporting the electric heater and the metal oxide, and the metal oxide is arranged on the electric heater; the controller is connected with the first switch, the second switch, the third switch, the compressed air quantity control device and the electric heater control device, the compressed air quantity control device is used for controlling compressed air quantity entering the oxidation-reduction heat storage reaction chamber, and the electric heater control device is used for controlling electric heater power;
the turbine generator is connected with an air turbine, an inlet of the air turbine is connected with an outlet of the redox thermal storage reactor, an exhaust port of the air turbine is connected with a waste heat boiler, and the waste heat boiler is connected with a heating system.
The operation method of the peak shaving power generation system of the coal-fired unit coupled with thermochemical energy storage is as follows: the controller judges whether the power grid is in a low electricity consumption period or a high electricity consumption period, and further judges whether the metal oxide is in a heat storage or heat release process;
if the metal oxide is judged to be in the heat storage process, the controller closes the second switch, opens the third switch and controls the electric heater control device to heat the electric heater so as to quickly reduce the network power of the peak shaving power generation system of the coal-fired unit; the controller controls the electric heater control device according to the peak regulation power generation system internet power of the coal-fired unit, the target internet power, the mass of each metal oxide, the temperature of each metal oxide and the oxygen partial pressure of each oxidation-reduction heat storage reaction cell, and the electric heaters are sequentially put into the corresponding electric heaters according to the temperature of the metal oxide;
if the metal oxide is judged to be in the exothermic process, the controller opens the second switch and closes the third switch; the compressed air quantity control device is controlled to heat compressed air at an air turbine inlet so as to quickly improve the network power of a peak shaving power generation system of the coal-fired unit; the controller inputs the corresponding compressed air quantity control device according to the mass of each metal oxide, the temperature of each metal oxide and the oxygen partial pressure of each oxidation-reduction heat storage reaction chamber in sequence according to the temperature of each metal oxide.
Further, a quality measuring device, a temperature measuring device and an oxygen partial pressure measuring device are also arranged in each oxidation-reduction heat storage reaction cell; the mass measuring device is used for measuring the mass of the metal oxide, the temperature measuring device is used for measuring the temperature of the metal oxide, and the oxygen partial pressure measuring device is used for measuring the oxygen partial pressure of the oxidation-reduction heat storage reaction cell; the mass measuring device, the temperature measuring device and the oxygen partial pressure measuring device are connected with the controller and controlled by the controller.
Further, the metal oxide is Co 3 O 4 /CoO、Mn 2 O 3 /Mn 3 O 4 、CuO/Cu 2 O、 BaO 2 Any of the/BaO, the individual metal oxides within the same redox thermal storage reactor are of the same class.
Further, the redox thermal storage reactor is also provided with an exhaust pipeline, and the exhaust pipeline is provided with an exhaust pipeline isolation valve.
The invention adopts another technical scheme that: the peak shaving power generation method of the coal-fired unit coupled with thermochemical energy storage comprises the following steps:
step 4, starting from the metal oxide with the lowest temperature, sequentially adding corresponding electric heaters until the total heat storage power of the redox heat storage reactor reaches the target heat storage power of the redox heat storage reactor;
and 9, starting from the metal oxide with the highest temperature, sequentially adding a corresponding compressed air amount control device until the total amount of compressed air at the inlet of the redox thermal storage reactor reaches the target compressed air amount of the air turbine inlet.
Further, the target heat storage power P of the redox heat storage reactor 3 The expression of (2) is: p (P) 3 ＝P 1 -P 2 Wherein P is 1 The unit of the power for surfing the internet of the peak shaving power generation system of the coal-fired unit is as follows: j/s; p (P) 2 The unit of target internet power of the peak shaving power generation system of the coal-fired unit is as follows: j/s; heat storage power f of each metal oxide n The expression of (2) is: f (f) n ＝α n ×m n Wherein alpha is n The heat storage power per unit mass of each metal oxide is as follows: j/(g.s); m is m n The mass of each metal oxide is as follows: g; in the heat storage process, according to the sequence from low to high of the metal oxide temperature, the corresponding electric heaters are sequentially put into the furnace until Sigma f n ＝P 3 Wherein f 1 ～f n The heat storage power of the metal oxide is respectively from the first low temperature to the nth low temperature, and the units are as follows: j/s.
Further, turbine generator target output power P 4 The expression of (2) is: p (P) 4 ＝P 2 -P 1 Wherein P is 1 The unit of the power for surfing the internet of the peak shaving power generation system of the coal-fired unit is as follows: j/s; p (P) 2 The unit of target internet power of the peak shaving power generation system of the coal-fired unit is as follows: j/s.
Further, the exothermic power q of each metal oxide n The expression of (2) is: q n ＝β n ×m n Wherein beta is n Exothermic power per unit mass for each metal oxide in units of: j/(g.s); m is m n The mass of each metal oxide is as follows: g; target inlet compressed air quantity g of each oxidation-reduction heat storage reaction chamber n The expression of (2) is: g n ＝q n /(h 2 -h 1 ) Wherein h is 2 The enthalpy of the compressed air for the target inlet of the air turbine is given in: j/g; h is a 1 The enthalpy value of compressed air at the inlet of each oxidation-reduction heat storage reaction chamber is expressed as follows: j/g.
Further, in the exothermic process, corresponding compressed air quantity control devices are sequentially added according to the sequence from high to low of the metal oxide temperature until Sigma g n ＝γ 1 Which is provided withIn g 1 ～g n The compressed air quantity at the inlet of the first high Wendi n high-temperature oxidation-reduction heat storage reaction chamber is respectively as follows: g/s; gamma ray 1 The target inlet compressed air amount for the air turbine is given by: g/s.
Further, the heat storage power per unit mass of the metal oxide is determined by the metal oxide temperature, the metal oxide temperature rise rate and the oxygen partial pressure of the redox heat storage reaction cell.
Further, the heat release power per unit mass of the metal oxide is determined by the metal oxide temperature, the metal oxide temperature drop rate and the oxygen partial pressure of the redox heat storage reaction cell.
Further, the rate of temperature rise of the metal oxide should be kept constant during the heat storage process.
Further, the rate of temperature drop of the metal oxide should be maintained during the exothermic process.
Further, the air turbine target inlet compressed air enthalpy and compressed air quantity are obtained according to the turbine generator target output power.
Compared with the prior art, the invention has the following beneficial effects:
1) In the past, the coal-fired unit is limited by the capability of the coal-fired unit, and the bottleneck of deep peak regulation is difficult to break through. The invention can effectively reduce the output power of the peak shaving power generation system of the coal-fired unit by utilizing thermochemical energy storage when the power grid is in the electricity consumption low-valley period and the peak shaving power generation system of the coal-fired unit needs to rapidly reduce the internet power, thereby achieving the purpose of breaking through the deep peak shaving power.
2) In the past, the coal-fired unit is limited by the capability of the main body, and the bottleneck of the rapid load change rate of the coal-fired unit is difficult to break through. The invention can utilize thermochemical energy storage to quickly reduce the output power of the peak shaving power generation system of the coal-fired unit when the peak shaving power generation system of the coal-fired unit needs to quickly reduce the internet power, and can utilize the air turbine to generate electricity to quickly improve the output power of the peak shaving power generation system of the coal-fired unit when the peak shaving power generation system of the coal-fired unit needs to quickly improve the internet power, and simultaneously, the steam generated by the waste heat boiler can assist in improving the internet power output power of the peak shaving power generation system of the coal-fired unit.
3) The thermochemical energy storage technology is based on reversible thermochemical reaction, realizes energy storage and release through breaking and recombination of chemical bonds, has the characteristics of high energy storage density, long heat storage time and the like, has obvious advancement compared with other heat storage technologies, can effectively reduce the heat storage facility field while guaranteeing the peak regulation requirement of a coal-fired unit, and is more flexible to operate.
Drawings
FIG. 1 is a schematic diagram of a peak shaving power generation system of a coal-fired unit coupled with thermochemical energy storage in accordance with the present invention;
FIG. 2 is a flow chart of a peak shaving power generation method of a coal-fired unit coupled with thermochemical energy storage.
The system comprises a 1-coal-fired generator, a 2-controller, a 3-output circuit, a 4-first switch, a 5-first transformer, a 6-power grid, a 7-second switch, an 8-second transformer, a 9-third switch, a 10-third transformer, an 11-redox thermal storage reactor, a 12-electric heater, a 13-support, a 14-metal oxide, a 15-quality measuring device, a 16-temperature measuring device, a 17-oxygen partial pressure measuring device, an 18-compressed air quantity controlling device, a 19-exhaust pipeline, a 20-electric heater controlling device, a 21-redox thermal storage reaction chamber, a 22-exhaust pipeline isolating valve, a 23-air turbine, a 24-turbine generator, a 25-waste heat boiler and a 26-heating system.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings, so that the technical scheme of the present invention is easier to understand and master. It should be understood that the specific embodiments described herein are intended to be illustrative of only some, but not all embodiments of the invention, and that other embodiments may be made by those skilled in the art without the benefit of the inventive faculty.
Example 1
Referring to fig. 1, the invention is a schematic diagram of a peak shaving power generation system of a coal-fired unit coupled with thermochemical energy storage. The system comprises a coal-fired power generator 1, a controller 2, an output circuit 3, a first switch 4, a first transformer 5, a power grid 6, a second switch 7, a second transformer 8, a third switch 9, a third transformer 10, a redox thermal storage reactor 11, an electric heater 12, a support 13, an air turbine 23 and a turbine generator 24.
The coal-fired power generator 1 is connected to the power grid 6 via a first switch 4, a first transformer 5 and an output line 3.
The output line 3 is connected with an electric heater 12 through a second switch 7 and a second transformer 8.
The output line 3 is connected with a turbine generator 24 through a third switch 9 and a third transformer 10, the turbine generator 24 is connected with an air turbine 23, an inlet of the air turbine is connected with an outlet of the redox thermal storage reactor 11, an exhaust port of the air turbine 23 is connected with a waste heat boiler 25, and the waste heat boiler 25 is connected with a heating system 26.
The redox thermal storage reactor 11 is partitioned into a plurality of redox thermal storage reaction cells 21, and an electric heater 12, a support 13, a metal oxide 14, a mass measuring device 15, a temperature measuring device 16, an oxygen partial pressure measuring device 17, a compressed air amount controlling device 18, and an electric heater controlling device 20 are arranged in each redox thermal storage reaction cell 21. The support 13 supports the electric heater 12 and the metal oxide 14, and the metal oxide 14 is provided on the electric heater 12.
The controller 2 is connected to the first switch 4, the second switch 7, the third switch 9, the mass measuring device 15, the temperature measuring device 16, the oxygen partial pressure measuring device 17, the compressed air amount controlling device 18, and the electric heater controlling device 20.
An exhaust pipe 19 is provided on each redox heat storage reaction cell 21, and an exhaust pipe isolation valve 22 is provided on the exhaust pipe 19.
The metal oxide 14 may be Co 3 O 4 /CoO or Mn 2 O 3 /Mn 3 O 4 Or CuO/Cu 2 O or BaO 2 BaO, etc., but the metal oxides 14 in the same redox thermal storage reactor 11 should be of the same type.
The mass measuring device 15 is used for measuring the mass of the metal oxide 14.
The temperature measuring device 16 is used for measuring the temperature of the metal oxide 14.
The oxygen partial pressure measuring device 17 is used for measuring the oxygen partial pressure of the oxidation-reduction heat storage reaction chamber 21.
The compressed air amount control device 18 is used for controlling the amount of compressed air entering the redox heat storage reaction cell 21.
The electric heater control device 20 is used for controlling the power of the electric heater 12.
The operation method of the power generation system is as follows:
the controller 2 determines that the power grid 6 is in a low electricity consumption period or a high electricity consumption period, and further determines whether the metal oxide 14 should be in a heat storage or heat release process.
If the metal oxide 14 is judged to be in the heat storage process, the controller 2 closes the second switch 7, opens the third switch 9 and controls the electric heater control device 20 to heat the electric heater 12 so as to quickly reduce the network power of the peak shaving power generation system of the coal-fired unit. The controller obtains the heat storage power of each metal oxide 14 according to the mass of each metal oxide 14 measured by the mass measuring device 15, the temperature of each metal oxide 14 measured by the temperature measuring device 16 and the oxygen partial pressure of each oxidation-reduction heat storage reaction cell 21 measured by the oxygen partial pressure measuring device 17. And obtaining the target heat storage power of the redox heat storage reactor 11 according to the peak shaving power of the coal-fired unit power generation system and the target internet power. According to the sequence of the temperature of the metal oxide 14 from low to high, the electric heater control device 20 is controlled to sequentially input the corresponding electric heaters 12 until the total power of the redox thermal storage reactor 11 reaches the target thermal storage power. The exhaust pipe isolation valve 22 is controlled according to the oxygen partial pressure of each redox heat storage reaction cell 21 so that the oxygen partial pressure of each redox heat storage reaction cell 21 is maintained below 10%.
If it is determined that the metal oxide 14 should be in the exothermic process, the controller 2 opens the second switch 7, closes the third switch 8, closes the exhaust pipeline isolation valve 22, and controls the compressed air amount control device 18 to heat the compressed air at the inlet of the air turbine 23, thereby driving the turbine generator 24 to generate electricity so as to rapidly increase the internet power of the peak shaving power generation system of the coal-fired unit. The controller 2 obtains the heat release power of each metal oxide 14 according to the mass of each metal oxide 14 measured by the mass measuring device 15, the temperature of each metal oxide 14 measured by the temperature measuring device 16, and the oxygen partial pressure of each redox heat storage reaction cell 21 measured by the oxygen partial pressure measuring device 17. And obtaining the target output power of the turbine generator 24 according to the peak shaving power of the coal-fired unit power generation system and the target internet power. According to the order of the temperature of the metal oxide 14 from high to low, the corresponding compressed air amount control device 18 is sequentially put into the redox thermal storage reactor 11 until the total amount of the compressed air at the inlet reaches the target compressed air amount at the inlet of the air turbine 23. The exhaust gas of the air turbine 23 is sent to the waste heat boiler 25, and the steam generated by the waste heat boiler 25 is sent to the heating system 26 to assist in improving the output power of the peak shaving power generation system of the coal-fired unit.
Example 2
Referring to fig. 2, a schematic diagram of a peak shaving power generation method of a thermochemical energy-storage coal-fired unit according to the invention is shown, wherein the peak shaving power generation system of the thermochemical energy-storage coal-fired unit in embodiment 1 is adopted, and the peak shaving power generation method comprises the following steps:
step 4, starting from the metal oxide with the lowest temperature, sequentially adding corresponding electric heaters until the total heat storage power of the redox heat storage reactor reaches the target heat storage power of the redox heat storage reactor;
and 9, starting from the metal oxide with the highest temperature, sequentially adding a corresponding compressed air amount control device until the total amount of compressed air at the inlet of the redox thermal storage reactor reaches the target compressed air amount of the air turbine inlet.
Specifically, the expression of the target heat storage power of the redox heat storage reactor is: p (P) 3 ＝P 1 -P 2 Wherein P is 1 The unit of the power for surfing the internet of the peak shaving power generation system of the coal-fired unit is as follows: j/s; p (P) 2 The unit of target internet power of the peak shaving power generation system of the coal-fired unit is as follows: j/s.
Specifically, the expression of the heat storage power of each metal oxide is: f (f) n ＝α n ×m n Wherein alpha is n The heat storage power per unit mass of each metal oxide is as follows: j/(g.s); m is m n The mass of each metal oxide is as follows: g.
specifically, in the heat storage process, corresponding electric heaters are sequentially put into the heat storage process according to the sequence from low to high of the metal oxide temperature until Sigma f n ＝P 3 Wherein f 1 ～f n The heat storage power of the metal oxide is respectively from the first low temperature to the nth low temperature, and the units are as follows: j/s.
Specifically, the expression for the target output power of the turbine generator is: p (P) 4 ＝P 2 -P 1 Wherein P is 1 The unit of the power for surfing the internet of the peak shaving power generation system of the coal-fired unit is as follows: j/s; p (P) 2 The unit of target internet power of the peak shaving power generation system of the coal-fired unit is as follows: j/s.
In particular, table of exothermic power of each metal oxideThe expression is: q n ＝β n ×m n Wherein beta is n Exothermic power per unit mass for each metal oxide in units of: j/(g.s); m is m n The mass of each metal oxide is as follows: g.
specifically, the expression of the target inlet compressed air amount of each redox heat storage reaction cell is: g n ＝q n /(h 2 -h 1 ) Wherein h is 2 The enthalpy of the compressed air for the target inlet of the air turbine is given in: j/g; h is a 1 The enthalpy value of compressed air at the inlet of each oxidation-reduction heat storage reaction chamber is expressed as follows: j/g.
Specifically, in the heat release process, corresponding air quantity control devices are sequentially input according to the sequence of the metal oxide temperature from high to low until Sigma g n ＝γ 1 Wherein g 1 ～g n The compressed air quantity at the inlet of the first high Wendi n high-temperature oxidation-reduction heat storage reaction chamber is respectively as follows: g/s; gamma ray 1 The target inlet compressed air amount for the air turbine is given by: g/s.
The heat storage power of the unit mass of the metal oxide is determined by the temperature of the metal oxide, the temperature rise rate of the metal oxide and the oxygen partial pressure of the oxidation-reduction heat storage reaction chamber.
The heat release power of the unit mass of the metal oxide is determined by the temperature of the metal oxide, the temperature drop rate of the metal oxide and the oxygen partial pressure of the oxidation reduction heat storage reaction chamber.
In the heat storage process, the temperature rise rate of the metal oxide is kept unchanged.
The rate of metal oxide temperature drop should be maintained during the exothermic process.
The target inlet compressed air enthalpy value of the air turbine and the compressed air quantity are obtained according to the target output power of the turbine generator.
The foregoing is illustrative of the present invention and is not to be construed as limiting thereof. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this invention, and are intended to be within the scope of this invention.
Claims (10)
1. The peak shaving power generation system of the coal-fired unit for coupling thermochemical energy storage is characterized by comprising a coal-fired power generator (1), a controller (2), an output circuit (3), a first switch (4), a first transformer (5), a power grid (6), a second switch (7), a second transformer (8), a third switch (9), a third transformer (10), a redox thermal storage reactor (11), an electric heater (12), a support body (13), an air turbine (23) and a turbine generator (24);
the coal-fired power generator (1) is connected with a power grid (6) through a first switch (4), a first transformer (5) and an output line (3);
the output circuit (3) is connected with the electric heater (12) through the second switch (7) and the second transformer (8), and is connected with the turbine generator (24) through the third transformer (10) and the third switch (9);
the redox heat storage reactor (11) is divided into a plurality of redox heat storage reaction cells (21), an electric heater (12), a supporting body (13), a metal oxide (14), a compressed air amount control device (18) and an electric heater control device (20) are arranged in each redox heat storage reaction cell (21), the supporting body (13) is used for supporting the electric heater (12) and the metal oxide (14), and the metal oxide (14) is arranged on the electric heater (12); the controller (2) is connected with the first switch (4), the second switch (7), the third switch (9), the compressed air quantity control device (18) and the electric heater control device (20), the compressed air quantity control device (18) is used for controlling the compressed air quantity entering the oxidation-reduction heat storage reaction chamber, and the electric heater control device (20) is used for controlling the power of the electric heater;
the turbine generator (24) is connected with the air turbine (23), the inlet of the air turbine is connected with the outlet of the redox thermal storage reactor (11), the exhaust port of the air turbine (23) is connected with the waste heat boiler (25), and the waste heat boiler (25) is connected with the heating system (26).
2. The coupled thermochemical energy storage coal-fired unit peak shaving power generation system of claim 1, wherein the method of operation is as follows: the controller (2) judges that the power grid is in a low electricity consumption period or a high electricity consumption period, and further judges whether the metal oxide is in a heat storage or heat release process;
if the metal oxide is judged to be in the heat storage process, the controller closes the second switch, opens the third switch and controls the electric heater control device to heat the electric heater so as to quickly reduce the network power of the peak shaving power generation system of the coal-fired unit; the controller controls the electric heater control device according to the peak regulation power generation system internet power of the coal-fired unit, the target internet power, the mass of each metal oxide, the temperature of each metal oxide and the oxygen partial pressure of each oxidation-reduction heat storage reaction cell, and the electric heaters are sequentially put into the corresponding electric heaters according to the temperature of the metal oxide;
if the metal oxide is judged to be in the exothermic process, the controller opens the second switch and closes the third switch; the compressed air quantity control device is controlled to heat compressed air at an air turbine inlet so as to quickly improve the network power of a peak shaving power generation system of the coal-fired unit; the controller inputs the corresponding compressed air quantity control device according to the mass of each metal oxide, the temperature of each metal oxide and the oxygen partial pressure of each oxidation-reduction heat storage reaction chamber in sequence according to the temperature of each metal oxide.
3. The peak shaving power generation system of the coal-fired unit coupled with thermochemical energy storage according to claim 1 or 2, wherein a mass measuring device (15), a temperature measuring device (16) and an oxygen partial pressure measuring device (17) are further arranged in each oxidation-reduction heat storage reaction chamber (21); the mass measuring device (15) is used for measuring the mass of the metal oxide, the temperature measuring device (16) is used for measuring the temperature of the metal oxide, and the oxygen partial pressure measuring device (17) is used for measuring the oxygen partial pressure of the oxidation-reduction heat storage reaction cell (21); the mass measuring device (15), the temperature measuring device (16) and the oxygen partial pressure measuring device (17) are connected with the controller (2) and controlled by the controller.
4. The peak shaving power generation system of the coal-fired unit coupled with thermochemical energy storage according to claim 1 or 2, wherein the metal oxide (14) is Co 3 O 4 /CoO、Mn 2 O 3 /Mn 3 O 4 、CuO/Cu 2 O、BaO 2 Any of the/BaO, the individual metal oxides within the same redox thermal storage reactor are of the same class.
5. The peak shaving power generation system of the coal-fired unit coupled with thermochemical energy storage according to claim 1 or 2, wherein the redox thermal storage reactor (11) is further provided with an exhaust pipeline (19), and the exhaust pipeline (19) is provided with an exhaust pipeline isolation valve (22).
6. A peak shaving power generation method of a coal-fired unit coupled with thermochemical energy storage, which adopts the peak shaving power generation system of the coal-fired unit coupled with thermochemical energy storage as claimed in any one of claims 1 to 5, and is characterized by comprising the following steps:
step 1, judging that the power grid is in a low electricity consumption period or a high electricity consumption period, if the power grid is in the low electricity consumption period, executing the step 2, and if the power grid is in the high electricity consumption period, executing the step 5;
step 2, calculating target heat storage power of the redox heat storage reactor according to the peak shaving power generation system internet surfing power and the target internet surfing power of the coal-fired unit;
step 3, according to the temperature of each metal oxide and the oxygen partial pressure of each oxidation-reduction heat storage reaction cell, obtaining the heat storage power of each metal oxide in unit mass, and according to the mass of each metal oxide, calculating the heat storage power of each metal oxide;
step 4, starting from the metal oxide with the lowest temperature, sequentially adding corresponding electric heaters until the total heat storage power of the redox heat storage reactor reaches the target heat storage power of the redox heat storage reactor;
step 5, calculating target output power of the turbine generator according to the peak shaving power generation system internet surfing power and the target internet surfing power of the coal-fired unit;
step 6, obtaining an enthalpy value and a compressed air quantity of the compressed air at a target inlet of the air turbine according to the target output power of the turbine generator;
step 7, according to the temperature of each metal oxide and the oxygen partial pressure of each oxidation-reduction heat storage reaction cell, obtaining the heat release power of each metal oxide in unit mass, and according to the mass of each metal oxide, calculating the heat release power of each metal oxide;
step 8, calculating the target inlet compressed air quantity of each oxidation-reduction heat storage reaction cell according to the enthalpy value of the compressed air at the target inlet of the air turbine and the heat release power of each metal oxide;
and 9, starting from the metal oxide with the highest temperature, sequentially adding a corresponding compressed air amount control device until the total amount of compressed air at the inlet of the redox thermal storage reactor reaches the target compressed air amount of the air turbine inlet.
7. The method for peak shaving power generation of a coal-fired unit coupled with thermochemical energy storage of claim 6, wherein the target heat storage power P of the redox heat storage reactor 3 The expression of (2) is: p (P) 3 ＝P 1 -P 2 Wherein P is 1 The unit of the power for surfing the internet of the peak shaving power generation system of the coal-fired unit is as follows: j/s; p (P) 2 The unit of target internet power of the peak shaving power generation system of the coal-fired unit is as follows: j/s;
heat storage power f of each metal oxide n The expression of (2) is: f (f) n ＝α n ×m n Wherein alpha is n The heat storage power per unit mass of each metal oxide is as follows: j/(g.s); m is m n The mass of each metal oxide is as follows: g; in the heat storage process, according to the sequence from low to high of the metal oxide temperature, the corresponding electric heaters are sequentially put into the furnace until Sigma f n ＝P 3 Wherein f 1 ～f n The heat storage power of the metal oxide is respectively from the first low temperature to the nth low temperature, and the units are as follows: j/s.
8. The method for peak shaver power generation of coal-fired unit coupled with thermochemical energy storage according to claim 6, wherein the target output power P of turbine generator 4 The expression of (2) is: p (P) 4 ＝P 2 -P 1 Wherein P is 1 The unit of the power for surfing the internet of the peak shaving power generation system of the coal-fired unit is as follows: j/s; p (P) 2 The unit of target internet power of the peak shaving power generation system of the coal-fired unit is as follows: j/s.
9. The peak shaving power generation method of the coal-fired unit coupled with thermochemical energy storage as recited in claim 6, wherein each metal oxide gives off heat power q n The expression of (2) is: q n ＝β n ×m n Wherein beta is n Exothermic power per unit mass for each metal oxide in units of: j/(g.s); m is m n The mass of each metal oxide is as follows: g; target inlet compressed air quantity g of each oxidation-reduction heat storage reaction chamber n The expression of (2) is: g n ＝q n /(h 2 -h 1 ) Wherein h is 2 The enthalpy of the compressed air for the target inlet of the air turbine is given in: j/g; h is a 1 The enthalpy value of compressed air at the inlet of each oxidation-reduction heat storage reaction chamber is expressed as follows: j/g.
10. The peak shaving power generation method of the coal-fired unit coupled with thermochemical energy storage according to claim 6, wherein in the heat release process, corresponding compressed air quantity control devices are sequentially added according to the sequence of the metal oxide temperature from high to low until Σg n ＝γ 1 Wherein g 1 ～g n The compressed air quantity at the inlet of the first high Wendi n high-temperature oxidation-reduction heat storage reaction chamber is respectively as follows: g/s; gamma ray 1 The target inlet compressed air amount for the air turbine is given by: g/s.
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