CN114704380A - Peak-shaving power generation system and method of coal-fired unit coupled with thermochemical energy storage - Google Patents
Peak-shaving 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 69
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000004146 energy storage Methods 0.000 title claims abstract description 28
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 127
- 238000005338 heat storage Methods 0.000 claims abstract description 125
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 122
- 230000008569 process Effects 0.000 claims abstract description 19
- 239000002918 waste heat Substances 0.000 claims abstract description 11
- 230000033116 oxidation-reduction process Effects 0.000 claims description 54
- 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
- 238000002955 isolation Methods 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- UBEWDCMIDFGDOO-UHFFFAOYSA-N cobalt(II,III) oxide Inorganic materials [O-2].[O-2].[O-2].[O-2].[Co+2].[Co+3].[Co+3] UBEWDCMIDFGDOO-UHFFFAOYSA-N 0.000 claims description 3
- BERDEBHAJNAUOM-UHFFFAOYSA-N copper(I) oxide Inorganic materials [Cu]O[Cu] BERDEBHAJNAUOM-UHFFFAOYSA-N 0.000 claims description 3
- KRFJLUBVMFXRPN-UHFFFAOYSA-N cuprous oxide Chemical compound [O-2].[Cu+].[Cu+] KRFJLUBVMFXRPN-UHFFFAOYSA-N 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- AMWRITDGCCNYAT-UHFFFAOYSA-L manganese oxide Inorganic materials [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims description 3
- GEYXPJBPASPPLI-UHFFFAOYSA-N manganese(III) oxide Inorganic materials O=[Mn]O[Mn]=O GEYXPJBPASPPLI-UHFFFAOYSA-N 0.000 claims description 3
- 230000005611 electricity Effects 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 2
- 238000006722 reduction reaction Methods 0.000 abstract 1
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000009529 body temperature measurement Methods 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
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 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
- 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
-
- 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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- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
- Control Of Turbines (AREA)
Abstract
The invention discloses a peak shaving power generation system and method of a coal-fired unit coupled with thermochemistry energy storage. The technical scheme adopted by the invention is as follows: when the power grid is in the electricity consumption valley period, the metal oxide is subjected to reduction reaction by using part of power generated by the coal-fired unit, and then the heat storage process is completed, so that the network power of the peak-shaving power generation system of the coal-fired unit is quickly reduced; when the power grid is in a peak period of power utilization, the metal oxide is subjected to oxidation reaction to finish a heat release process so as to heat compressed air at the inlet of the air turbine, so that the power of the coal-fired unit peak-shaving power generation system on line is rapidly improved, and meanwhile, steam generated by the waste heat boiler can exhaust part of steam extracted by the steam turbine so as to assist in improving the output power of the coal-fired unit peak-shaving power generation system. The invention can improve the deep peak shaving level of the peak shaving power generation system of the coal-fired unit, can also improve the rapid load variation capacity, provides support for peak shaving and valley filling of the power grid, and further improves 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 generator set coupled with thermochemical energy storage.
Background
In recent years, the aim of 'double carbon' is provided, the accelerated transformation and upgrading of energy systems in China are imperative, the installed capacity of renewable energy sources can be increased on a larger scale in the future, and the large-scale grid connection of the renewable energy sources brings unprecedented challenges to the stability of power systems. In order to improve the operation safety and the scheduling flexibility of a power grid, a coal-fired unit serving as the main power of power generation at the present stage is bound to bear more frequent ultra-low load deep peak shaving tasks, and meanwhile, the coal-fired unit needs to have the capability of rapid load change.
The traditional coal-fired unit is limited by load change and ultralow load operation capacity, so that the quick load increasing and reducing capacity and deep peak shaving performance of the response power grid are influenced, and the power grid is limited to a certain extent on the renewable energy consumption capacity.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a peak shaving power generation system and method of a coal-fired unit coupled with thermochemical energy storage.
Therefore, the invention adopts a technical scheme that: the peak-shaving power generation system of the coal-fired unit coupled with thermal chemical 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, an oxidation-reduction heat storage reactor, an electric heater, a support 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, and an electric heater, a support body, metal oxide, a compressed air quantity control device and an electric heater control device are arranged in each redox heat storage reaction cell, wherein 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 the quantity of compressed air entering the oxidation-reduction heat storage reaction chamber, and the electric heater control device is used for controlling the power of the electric heater;
the turbine generator is connected with an air turbine, an inlet of the air turbine is connected with an outlet of the oxidation-reduction heat 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 heat supply system.
The operation method of the peak shaving power generation system of the coupled thermochemical energy storage coal-fired unit is as follows: the controller judges whether the power grid is in a low-power consumption valley period or a high-power consumption peak period, and further judges whether the metal oxide is in a heat storage process or a heat release process;
if the metal oxide is judged to be in the heat storage process, the controller closes the second switch and 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 network power of the peak-shaving power generation system of the coal-fired unit, the target network power, the quality of each metal oxide, the temperature of each metal oxide and the oxygen partial pressure of each oxidation-reduction heat storage reaction chamber, and the electric heaters are sequentially fed according to the temperature of the metal oxide;
if the metal oxide is judged to be in the heat release process, the controller opens the second switch and closes the third switch; controlling a compressed air quantity control device to heat compressed air at an air turbine inlet so as to quickly improve the power of the coal-fired unit peak shaving power generation system on line; the controller is used for sequentially feeding the corresponding compressed air quantity control devices according to the metal oxide quality, the metal oxide temperature and the oxygen partial pressure of each oxidation-reduction heat storage reaction chamber and the metal oxide temperature.
Furthermore, a mass measuring device, a temperature measuring device and an oxygen partial pressure measuring device are arranged in each oxidation-reduction heat storage reaction chamber; 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 chamber; the quality measuring device, the temperature measuring device and the oxygen partial pressure measuring device are connected with the controller and are controlled by the controller.
Further, the metal oxide is Co3O4/CoO、Mn2O3/Mn3O4、CuO/Cu2O、 BaO2Any of BaO, respective metal oxidation in the same redox heat storage reactorThe substances are of the same class.
Furthermore, an exhaust pipeline is also arranged on the oxidation-reduction heat storage reactor, and an exhaust pipeline isolating valve is arranged on the exhaust pipeline.
The other technical scheme adopted by the invention is as follows: the peak shaving power generation method of the coal-fired unit coupled with thermochemical energy storage comprises the following steps:
step 4, sequentially putting corresponding electric heaters from the metal oxide with the lowest temperature until the total heat storage power of the oxidation-reduction heat storage reactor reaches the target heat storage power of the oxidation-reduction heat storage reactor;
and 9, sequentially putting corresponding compressed air quantity control devices from the metal oxide with the highest temperature until the total quantity of the compressed air at the inlet of the oxidation-reduction heat storage reactor reaches the target inlet compressed air quantity of the air turbine.
Further, a target heat storage power P of the redox heat storage reactor3The expression of (a) is: p3＝P1-P2Wherein P is1The unit of the network power of the peak-shaving power generation system of the coal-fired unit is as follows: j/s; p2The unit of the target internet power of the peak-shaving power generation system of the coal-fired unit is as follows: j/s; heat storage capacity f of each metal oxidenThe expression of (a) is: f. ofn＝αn×mnWherein α isnThe unit mass heat storage power of each metal oxide is as follows: j/(g.s); m isnThe unit is the mass of each metal oxide: g; in the heat storage process, the corresponding electric heaters are sequentially added according to the sequence of the metal oxide temperature from low to high until sigma fn＝P3Wherein f is1～fnThe heat storage power of the first low-temperature metal oxide to the nth low-temperature metal oxide is respectively as follows: j/s.
Further, the target output power P of the turbine generator4The expression of (a) is: p4＝P2-P1Wherein P is1The unit of the network power of the peak-shaving power generation system of the coal-fired unit is as follows: j/s; p2The unit of the target internet power of the peak-shaving power generation system of the coal-fired unit is as follows: j/s.
Further, the heat release power q of each metal oxidenThe expression of (a) is: q. q.sn＝βn×mnWherein, βnThe heat release power per unit mass of each metal oxide is as follows: j/(g.s); m isnThe unit is the mass of each metal oxide: g; target inlet compressed air amount g of each oxidation-reduction heat storage reaction chambernThe expression of (a) is: gn＝qn/(h2-h1) Wherein h is2The enthalpy value of compressed air at a target inlet of an air turbine is expressed by the following unit: j/g; h is1The enthalpy value of compressed air at the inlet of each oxidation-reduction heat storage reaction chamber is as follows: j/g.
Further, the air conditioner is provided with a fan,in the heat release process, according to the order of metal oxide temperature from high to low, the corresponding compressed air quantity control devices are put in sequence until sigma gn＝γ1Wherein g is1～gnThe compressed air quantity at the inlet of each of the first high-temperature to the nth high-temperature oxidation-reduction heat storage reaction small chamber is as follows: g/s; gamma ray1Is the target inlet compressed air quantity of the air turbine, and the unit is as follows: g/s.
Further, the heat storage capacity per unit mass of the metal oxide is determined by the temperature of the metal oxide, the rate of temperature rise of the metal oxide and the oxygen partial pressure of the redox heat storage reaction chamber.
Further, the exothermic power per unit mass of metal oxide is determined by the metal oxide temperature, the rate of temperature drop of the metal oxide, and the oxygen partial pressure of the redox heat storage reaction cell.
Furthermore, the rate of temperature rise of the metal oxide should be kept constant during the heat storage process.
Further, the rate of metal oxide temperature drop should be maintained constant during the exotherm.
Further, the target inlet compressed air enthalpy and the compressed air quantity of the air turbine are obtained according to the target output power of the turbine generator.
Compared with the prior art, the invention has the following beneficial effects:
1) the traditional coal-fired unit is restricted by the body capacity and is difficult to break through the bottleneck of deep peak regulation. 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 valley period and the peak shaving power generation system of the coal-fired unit needs to rapidly reduce the on-line power, thereby achieving the purpose of breaking through the deep peak shaving power.
2) The traditional coal-fired unit is limited by the capacity of the unit body, and the bottleneck of rapid load change rate is difficult to break through. According to the invention, when the peak-shaving power generation system of the coal-fired unit needs to rapidly reduce the power of the peak-shaving power generation system, the output power of the peak-shaving power generation system of the coal-fired unit is rapidly reduced by utilizing thermochemical energy storage, when the peak-shaving power generation system of the coal-fired unit needs to rapidly improve the power of the peak-shaving power generation system of the coal-fired unit, the output power of the peak-shaving power generation system of the coal-fired unit is rapidly improved by utilizing air turbine power generation, and meanwhile, the steam generated by the waste heat boiler can assist in improving the 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 the storage and release of energy through the breakage and recombination of chemical bonds, has the characteristics of large 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 ensuring 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 according to 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.
Wherein, 1-coal-fired generator, 2-controller, 3-output line, 4-first switch, 5-first transformer, 6-electric network, 7-second switch, 8-second transformer, 9-third switch, 10-third transformer, 11-oxidation-reduction heat storage reactor, 12-electric heater, 13-support, 14-metal oxide, 15-quality measuring device, 16-temperature measuring device, 17-oxygen partial pressure measuring device, 18-compressed air quantity control device, 19-exhaust pipeline, 20-electric heater control device, 21-oxidation-reduction heat storage reaction chamber, 22-exhaust pipeline isolating valve, 23-air turbine, 24-turbine generator, 25-waste heat boiler, etc, 26-heating system.
Detailed Description
The following detailed description of the embodiments of the present invention is provided in connection with the accompanying drawings for the purpose of facilitating understanding and understanding of the technical solutions of the present invention. It is to be understood that the specific embodiments described herein are merely illustrative of some, but not all, embodiments of the invention and that other embodiments may be devised by those skilled in the art without the use of the inventive faculty and the scope of the invention is to be protected.
Example 1
Fig. 1 is a schematic diagram of a peak shaving power generation system of a coal-fired unit coupled with thermochemical energy storage according to the present invention. The system comprises a coal-fired power generator 1, a controller 2, an output line 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, an oxidation-reduction heat 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 to the power grid 6 through 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 heat 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 heat storage reactor 11 is partitioned into a plurality of redox heat storage reaction cells 21, and an electric heater 12, a support body 13, a metal oxide 14, a mass measurement device 15, a temperature measurement device 16, an oxygen partial pressure measurement device 17, a compressed air amount control device 18, and an electric heater control device 20 are arranged in each of the redox heat storage reaction cells 21. The support body 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 3 is connected with a first switch 4, a second switch 7, a third switch 9, a mass measuring device 15, a temperature measuring device 16, an oxygen partial pressure measuring device 17, a compressed air amount control device 18, and an electric heater control device 20.
Each oxidation-reduction heat storage reaction chamber 21 is provided with an exhaust pipeline 19, and the exhaust pipeline 19 is provided with an exhaust pipeline isolation valve 22.
The metal oxide 14 may be Co3O4(ii) CoO or Mn2O3/Mn3O4Or CuO/Cu2O or BaO2BaO, etc., but the metal oxides 14 in the same redox storage reactor 11 should be of the same type.
The mass measuring device 15 is used to measure the mass of the metal oxide 14.
The temperature measuring device 16 is used to measure the temperature of the metal oxide 14.
The oxygen partial pressure measuring device 17 is used to measure the oxygen partial pressure of the redox heat storage reaction chamber 21.
The compressed air amount control device 18 is used to control the amount of compressed air entering the redox heat storage reaction chamber 21.
The electric heater control device 20 is used to control the electric heater 12 power.
The operation method of the power generation system comprises the following steps:
the controller 2 determines whether the grid 6 is in a low-power consumption valley period or a high-power consumption peak period, and then 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 and opens the third switch 8, 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 capacity 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 chamber 21 measured by the oxygen partial pressure measuring device 17. And obtaining the target heat storage power of the oxidation-reduction heat storage reactor 11 according to the peak-shaving power generation system grid power and the target grid power of the coal-fired unit. According to the sequence of the temperature of the metal oxide 14 from low to high, the electric heater control device 20 is controlled, and the corresponding electric heaters 12 are sequentially added until the total power of the oxidation-reduction heat storage reactor 11 reaches the target heat storage power. The exhaust duct isolation valve 22 is controlled in accordance with 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 at 10% or less.
If the metal oxide 14 is judged to be in the heat release process, the controller 2 opens the second switch 7, closes the third switch 8, closes the exhaust pipeline isolation valve 22, controls the compressed air quantity control device 18 to heat compressed air at the inlet of the air turbine 23, and further drives the turbine generator 24 to generate electricity so as to rapidly improve the power of the coal-fired unit peak shaving power generation system on line. The controller 2 obtains the heat release power of each metal oxide 14 based on 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 output power of the turbine generator 24 according to the network surfing power and the target network surfing power of the peak shaving power generation system of the coal-fired unit. According to the sequence of the temperature of the metal oxide 14 from high to low, corresponding compressed air quantity control devices 18 are sequentially put into the corresponding compressed air quantity control devices until the total quantity of the compressed air at the inlet of the oxidation-reduction heat storage reactor 11 reaches the target inlet compressed air quantity of the air turbine 23. The exhaust gas of the air turbine 23 is sent to a waste heat boiler 25, and the steam generated by the waste heat boiler 25 is sent to a heat supply 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 present invention, which employs the peak shaving power generation system of the coal-fired unit coupled with thermochemical energy storage according to embodiment 1, includes the following steps:
step 4, sequentially putting corresponding electric heaters from the metal oxide with the lowest temperature until the total heat storage power of the oxidation-reduction heat storage reactor reaches the target heat storage power of the oxidation-reduction heat storage reactor;
and 9, sequentially putting corresponding compressed air quantity control devices from the metal oxide with the highest temperature until the total quantity of the compressed air at the inlet of the oxidation-reduction heat storage reactor reaches the target inlet compressed air quantity of the air turbine.
Specifically, the expression of the target heat storage power of the redox heat storage reactor is as follows: p3＝P1-P2Wherein P is1The unit of the network power of the peak-shaving power generation system of the coal-fired unit is as follows: j/s; p is2The unit of the target internet power of the peak-shaving power generation system of the coal-fired unit is as follows: j/s.
Specifically, the expression of each metal oxide heat storage power is as follows: f. ofn＝αn×mnWherein α isnThe unit mass heat storage power of each metal oxide is as follows: j/(g.s); m is a unit ofnThe unit is the mass of each metal oxide: g.
specifically, in the heat storage process, the corresponding electric heaters are sequentially put into the heat storage tank according to the sequence of the metal oxide temperature from low to high until sigma fn＝P3Wherein f is1～fnThe heat storage power of the first low-temperature metal oxide to the nth low-temperature metal oxide is respectively as follows: j/s.
Specifically, the expression of the target output power of the turbine generator is as follows: p4＝P2-P1Wherein P is1The unit of the network power of the peak-shaving power generation system of the coal-fired unit is as follows: j/s; p2The unit of the target internet power of the peak-shaving power generation system of the coal-fired unit is as follows: j/s.
Specifically, the expression for the exothermic power of each metal oxide is: q. q.sn＝βn×mnWherein, βnThe heat release power per unit mass of each metal oxide is as follows: j/(g.s); m isnThe unit is the mass of each metal oxide: g.
specifically, the expression for the target inlet compressed air volume for each redox heat storage reaction cell is: gn＝qn/(h2-h1) Wherein h is2The enthalpy value of compressed air at a target inlet of an air turbine is expressed by the following unit: j/g; h is a total of1The enthalpy value of compressed air at the inlet of each oxidation-reduction heat storage reaction chamber is as follows: j/g.
Specifically, in the heat release process, according to the sequence of the metal oxide temperature from high to low, the corresponding air volume control devices are put into the heat release device in sequence until sigma gn＝γ1Wherein g is1～gnThe compressed air quantity at the inlet of each of the first high-temperature to the nth high-temperature oxidation-reduction heat storage reaction small chamber is as follows: g/s; gamma ray1Is the target inlet compressed air quantity of the air turbine, and the unit is as follows: 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 exothermic power per 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 redox heat storage reaction chamber.
The rate of temperature rise of the metal oxide should be kept constant during the heat storage.
The rate of metal oxide temperature drop should be maintained during the exotherm.
And the enthalpy value and the compressed air quantity of the compressed air at the target inlet of the air turbine are obtained according to the target output power of the turbine generator.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent alterations and modifications within the spirit and scope of the invention should be understood as being within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The peak-shaving power generation system of the coal-fired unit is characterized by comprising a coal-fired power generator 1, a controller 2, an output line 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, an oxidation-reduction heat storage reactor 11, an electric heater 12, a support body 13, an air turbine 23 and a turbine power 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 line 3 is connected with an electric heater 12 through a second switch 7 and a second transformer 8, and is connected with a turbine generator 24 through a third transformer 10 and a third switch 9;
the oxidation-reduction heat storage reactor 11 is divided into a plurality of oxidation-reduction heat storage reaction small chambers 21, each oxidation-reduction heat storage reaction small chamber 21 is internally provided with an electric heater 12, a support body 13, a metal oxide 14, a compressed air amount control device 18 and an electric heater control device 20, the support 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 a first switch 4, a second switch 7, a third switch 9, a compressed air quantity control device 18 and an electric heater control device 20, the compressed air quantity control device 18 is used for controlling the quantity of compressed air entering the oxidation-reduction heat storage reaction chamber, and the electric heater control device 20 is used for controlling the power of an 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 oxidation-reduction heat 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 peak shaving power generation system of a coal-fired unit coupled with thermochemical energy storage of claim 1, wherein the method of operation is as follows: the controller 2 judges whether the power grid is in a low-power consumption valley period or a high-power consumption peak period, and further judges whether the metal oxide is in a heat storage process or a heat release process;
if the metal oxide is judged to be in the heat storage process, the controller closes the second switch and 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 network power of the peak-shaving power generation system of the coal-fired unit, the target network power, the quality of each metal oxide, the temperature of each metal oxide and the oxygen partial pressure of each oxidation-reduction heat storage reaction chamber, and the electric heaters are sequentially fed according to the temperature of the metal oxide;
if the metal oxide is judged to be in the heat release process, the controller opens the second switch and closes the third switch; controlling a compressed air quantity control device to heat compressed air at an air turbine inlet so as to quickly improve the power of the coal-fired unit peak shaving power generation system on line; the controller is used for sequentially feeding the corresponding compressed air quantity control devices according to the metal oxide quality, the metal oxide temperature and the oxygen partial pressure of each oxidation-reduction heat storage reaction chamber and the metal oxide temperature.
3. The peak-shaving power generation system of a coal-fired unit coupled with thermochemical energy storage according to claim 1 or 2, characterized in that each oxidation-reduction heat storage reaction chamber 21 is further provided with a mass measuring device 15, a temperature measuring device 16 and an oxygen partial pressure measuring device 17; 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 chamber 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 a coal-fired unit coupled with thermochemical energy storage according to claim 1 or 2, characterized in that the metal oxide 14 is Co3O4/CoO、Mn2O3/Mn3O4、CuO/Cu2O、BaO2Any of the/BaO, the respective metal oxides within the same redox heat storage reactor are of the same type.
5. The peak-shaving power generation system of a coal-fired unit coupled with thermochemical energy storage according to claim 1 or 2, characterized in that the redox energy storage reactor 11 is further provided with an exhaust pipe 19, and the exhaust pipe 19 is provided with an exhaust pipe isolation valve 22.
6. The peak shaving power generation method of the 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, characterized by comprising the following steps:
step 1, judging whether a power grid is in a power consumption valley period or a power consumption peak period, if so, executing step 2, and if so, executing step 5;
step 2, calculating target heat storage power of the redox heat storage reactor according to the peak regulation power generation system grid power and the target grid power of the coal-fired unit;
step 3, obtaining the heat storage power of each metal oxide unit mass according to the temperature of each metal oxide and the oxygen partial pressure of each oxidation-reduction heat storage reaction chamber, and calculating the heat storage power of each metal oxide according to the mass of each metal oxide;
step 4, sequentially putting corresponding electric heaters from the metal oxide with the lowest temperature until the total heat storage power of the oxidation-reduction heat storage reactor reaches the target heat storage power of the oxidation-reduction heat storage reactor;
step 5, calculating the target output power of the turbine generator according to the network power of the peak-shaving power generation system of the coal-fired unit and the target network power;
step 6, obtaining an enthalpy value and a compressed air quantity of compressed air at a target inlet of the air turbine according to the target output power of the turbine generator;
step 7, obtaining the heat release power of each metal oxide unit mass according to the temperature of each metal oxide and the oxygen partial pressure of each oxidation-reduction heat storage reaction chamber, and calculating the heat release power of each metal oxide according to the mass of each metal oxide;
step 8, calculating the compressed air quantity of the target inlet of each oxidation-reduction heat storage reaction chamber 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, sequentially putting corresponding compressed air quantity control devices from the metal oxide with the highest temperature until the total quantity of the compressed air at the inlet of the oxidation-reduction heat storage reactor reaches the target inlet compressed air quantity of the air turbine.
7. The peak shaving power generation method of a coal-fired unit coupled with thermochemical energy storage according to claim 6, characterized in that target heat storage power P of redox heat storage reactor3The expression of (a) is: p3＝P1-P2Wherein P is1The unit of the network power of the peak-shaving power generation system of the coal-fired unit is as follows: j/s; p2The unit of the target internet surfing power of the peak shaving power generation system of the coal-fired unit is as follows: j/s;
heat storage capacity f of each metal oxidenThe expression of (a) is: f. ofn＝αn×mnWherein α isnThe unit mass heat storage power of each metal oxide is as follows: j/(g.s); m isnThe unit is the mass of each metal oxide: g; in the heat storage process, the corresponding electric heaters are sequentially added according to the sequence of the metal oxide temperature from low to high until sigma fn＝P3Wherein f is1～fnThe heat storage power of the first low-temperature metal oxide to the nth low-temperature metal oxide is respectively as follows: j/s.
8. The peak shaving power generation method of a coal-fired unit coupled with thermochemical energy storage according to claim 6, characterized in that the target output power P of the turbogenerator is P4The expression of (a) is: p is4＝P2-P1Wherein, P1The unit of the network power of the peak-shaving power generation system of the coal-fired unit is as follows: j/s; p2The target internet surfing power of the peak shaving power generation system of the coal-fired unit,the unit is: j/s.
9. The peak shaving power generation method of a coal-fired unit coupled with thermochemical energy storage according to claim 6, characterized in that the exothermic power q of each metal oxide is qnThe expression of (a) is: q. q ofn＝βn×mnWherein, βnThe heat release power per unit mass of each metal oxide is as follows: j/(g.s); m is a unit ofnThe unit is the mass of each metal oxide: g; target inlet compressed air amount g of each oxidation-reduction heat storage reaction chambernThe expression of (c) is: g is a radical of formulan＝qn/(h2-h1) Wherein h is2The enthalpy value of compressed air at a target inlet of an air turbine is expressed by the following unit: j/g; h is1The enthalpy value of compressed air at the inlet of each oxidation-reduction heat storage reaction chamber is as follows: j/g.
10. The peak-shaving power generation method of the coal-fired unit coupled with thermochemical energy storage of claim 6, wherein during the heat release, the corresponding compressed air amount control devices are put into the heat release system in turn according to the order of the temperature of the metal oxide from high to low until sigma gn＝γ1Wherein g is1～gnThe compressed air quantity at the inlet of each of the first high-temperature to the nth high-temperature oxidation-reduction heat storage reaction small chamber is as follows: g/s; gamma ray1Is the target inlet compressed air quantity of the air turbine, and the unit is as follows: g/s.
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