CN110685759A - Multistage power generation and energy storage method and system - Google Patents
Multistage power generation and energy storage method and system Download PDFInfo
- Publication number
- CN110685759A CN110685759A CN201910971059.8A CN201910971059A CN110685759A CN 110685759 A CN110685759 A CN 110685759A CN 201910971059 A CN201910971059 A CN 201910971059A CN 110685759 A CN110685759 A CN 110685759A
- Authority
- CN
- China
- Prior art keywords
- module
- hydrogen
- expander
- heat
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010248 power generation Methods 0.000 title claims abstract description 35
- 238000004146 energy storage Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 18
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000001257 hydrogen Substances 0.000 claims abstract description 40
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 40
- 239000007789 gas Substances 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000000203 mixture Substances 0.000 claims abstract description 15
- 230000001105 regulatory effect Effects 0.000 claims description 30
- 230000001276 controlling effect Effects 0.000 claims description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 11
- 239000001301 oxygen Substances 0.000 claims description 11
- 229910052760 oxygen Inorganic materials 0.000 claims description 11
- 238000005868 electrolysis reaction Methods 0.000 claims description 8
- 238000012546 transfer Methods 0.000 claims description 6
- 238000006479 redox reaction Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 4
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 4
- 230000003750 conditioning effect Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 description 7
- 230000006835 compression Effects 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/02—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of multiple-expansion type
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/60—Constructional parts of cells
- C25B9/65—Means for supplying current; Electrode connections; Electric inter-cell connections
-
- 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
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
- F01K3/18—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters
-
- 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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/02—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of multiple-expansion type
- F01K7/04—Control means specially adapted therefor
-
- 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
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention relates to a multi-stage power generation and energy storage method and a system, comprising the following steps: electrolyzing water to obtain hydrogen water mixture gas; inputting the hydrogen water mixture gas into an expander module, performing expansion work to generate power and storing residual energy; the expander module includes at least one expander. The invention adopts multi-stage expansion, which can increase the working capacity of the expansion unit and improve the comprehensive efficiency of the system; meanwhile, the multistage expansion can realize high-pressure ratio expansion and fully release pressure energy in air.
Description
Technical Field
The invention relates to the field of gas energy storage, in particular to a multi-stage power generation and energy storage method and system.
Background
The power generation of the new electric energy is in a high-speed development trend, however, due to the characteristics of randomness, intermittence, inverse peak regulation and the like of the new energy, the large-scale integration of the new energy into a power grid brings adverse effects to various aspects such as safe and stable operation, dispatching and the like of the system, and the insufficient peak regulation capability of the system becomes a main constraint for influencing the power grid to accept the new energy. The large-scale energy storage technology is adopted, the peak regulation capacity of the power grid can be improved, the method is an important means for solving the problem that the power grid abandons wind and limits the power, meanwhile, the occupation of wind power on a power transmission channel can be improved, and the flexible regulation capacity of the power grid is improved.
The cryogenic liquefied air energy storage technology is an energy storage mode that electric energy is used for compressing air in a power grid load valley period, the air is sealed in a scrapped mine, a settled seabed gas storage tank, a cave, an expired oil gas well or a newly-built gas storage well at high pressure, and the compressed air is released to push a steam turbine to generate electricity in a power grid load peak period. During energy storage, the air is compressed, cooled and liquefied by electric energy, and meanwhile, the heat energy released in the process is stored and used for heating the air during energy release; when releasing energy, the liquid air is pressurized and gasified to push the expansion generator set to generate electricity, and the cold energy in the process is stored and used for cooling the air when storing energy.
At present, an expansion machine is used as a core acting component of a compressed air energy storage power generation system, and has great influence on the efficiency of the compressed air energy storage power generation system. In the operation process of the compressed air energy storage power generation system, because the air pressure of the air storage chamber is gradually reduced, in order to maintain the constant pressure at the inlet of the expansion machine, a throttle valve is usually adopted to throttle the air to be stabilized to a lower pressure, and then the air enters the expansion machine to perform expansion work. Due to the use of the throttle valve, the work capacity of the high-pressure air is reduced, and the efficiency of the system is reduced.
Therefore, how to solve the problem of the temperature and pressure drop of the high-temperature and high-pressure gas after the power generation of the expander becomes an important technical problem to be solved by those skilled in the art.
Disclosure of Invention
Aiming at the problems in the prior art, the application provides a multistage power generation and energy storage method and system for cryogenic liquefied air energy storage.
A multi-stage power generation and energy storage method comprises the following steps: electrolyzing water to obtain hydrogen water mixture gas; inputting the hydrogen water mixture gas into an expander module, performing expansion work to generate power and storing residual energy; the expander module includes at least one expander.
And heat exchangers are respectively arranged among the expanders in the expander module, and the heat exchangers heat the pre-stage air input into the expanders.
And the heat exchangers control the flow of heat exchange media by controlling the opening of heat transfer oil constant temperature pipes of the heat exchangers, and control the outlet temperatures of the heat exchangers to be maintained at the same value according to the detected temperature. Its governing valve includes: electric control and manual control.
And when the inlet cut-off valve of the expansion machine module is fully opened, the pressure and the flow are controlled by utilizing the secondary pressure regulating valve.
Controlling the outlet pressure of the cryogenic pump and the flow rate of the liquefied air to be constant by using a regulating valve of the cryogenic pump; its governing valve includes: electric control and manual control.
When the load wave trough of the power system is generated, electrolyzing water in the power system into hydrogen and oxygen by the electric power of the wave trough;
at the peak of the load of the power system, hydrogen and ferric oxide (Fe)2O3) Carrying out oxidation-reduction reaction to generate a mixture gas of hydrogen and water vapor;
the mixed gas of hydrogen and steam generated by the reaction heats the air before the first expander.
A multi-stage power generation and energy storage system comprising: the system comprises a cryogenic pump, an evaporator, a first heat exchanger and an expander module; the cryogenic pump is used for inputting hydrogen water mixed gas obtained by electrolysis into the evaporator to obtain normal-temperature air; the power generation and energy storage module is used for inputting the normal temperature air into the expander module through the first heat exchanger to perform expansion work and power generation; the expander module includes at least two expanders.
The first heat exchanger is used for preheating normal-temperature air; and heat exchangers are respectively arranged among the expanders in the expander module, and the heat exchangers heat the pre-stage air input into the expanders.
Each heat exchanger comprises a regulating module; the regulating module controls the flow of heat exchange media by controlling the opening of the heat transfer oil constant temperature pipe of the heat exchanger, and controls the outlet temperature of each heat exchanger to be maintained at the same value according to the detected temperature, and the regulating valve comprises: electric control and manual control.
The expander module includes: a pressure flow module; and the pressure and flow module is used for controlling the pressure and flow by utilizing a secondary pressure regulating valve after the inlet shut-off valve of the expansion machine module is fully opened.
The air multistage expansion power generation system further comprises: a liquefied air flow rate constancy module; the liquefied air flow constant module is used for controlling the outlet pressure of the cryogenic pump and the liquefied air flow to be constant by utilizing a regulating valve of the cryogenic pump; its governing valve includes: electric control and manual control.
The cryogenic pump regulating valve comprises a left connecting pipe, a flow sensor, a supporting frame, a first valve, an electric control mechanism, a manual wheel, a second valve and a right connecting pipe, wherein the left connecting pipe is welded on the left side of the right connecting pipe; one end of the support frame is connected with the lower part of the electric control mechanism through a bolt, and the other end of the support frame is connected with the upper part of the intersection of the left connecting pipe and the right connecting pipe through a bolt; the flow sensor is connected to the middle position of the upper part of the inner wall of the left connecting pipe through a screw; the manual wheel penetrates through the right side of the upper wall of the right connecting pipe and is in threaded connection with the second valve; the first valve is in threaded connection with the electric control mechanism.
The multi-stage power generation and energy storage system further comprises: an electrolysis subsystem;
when the load wave trough of the power system is carried out, the electrolysis subsystem electrolyzes water in the power system into hydrogen and oxygen through the wave trough power;
when the electrolytic subsystem is at the load wave crest of the electric power system, hydrogen and ferric oxide (Fe)2O3) Carrying out oxidation-reduction reaction to generate a mixture gas of hydrogen and water vapor;
the mixed gas of hydrogen and water vapor generated by the reaction enters an evaporator to drive an expander to generate power.
The heat-conducting oil constant-temperature pipe of the heat exchanger comprises an oil guide pipe, an inlet connecting pipe, an outlet connecting pipe, a first temperature sensor, a second temperature sensor and a mechanical valve, wherein the inlet connecting pipe and the outlet connecting pipe are respectively welded at the left end and the right end of the oil guide pipe; the first temperature sensor and the second temperature sensor are respectively connected to the left side and the right side of the upper wall of the oil guide pipe through screws; the mechanical valve is in threaded connection with the middle position of the upper surface of the oil guide pipe.
Compared with the closest prior art, the technical scheme provided by the invention has the beneficial effects that:
1. according to the invention, two processing modes of high-temperature hydrogen water mixture gas and heating liquefied air are adopted, and after heat is obtained, multi-stage expansion is carried out, so that the working capacity of an expansion unit and the energy obtaining mode are effectively increased, and the comprehensive efficiency of the system is improved;
2. according to the invention, the opening of the regulating valve at the heat conducting oil inlet of the heat exchanger is controlled, so that the temperature of the outlet of the heat exchanger is controlled to be constant, the full and reasonable utilization of the cold and heat energy of the system is ensured, the system efficiency is improved, and the process design requirements are met;
3. the invention respectively controls the air flow and the pressure through the expander and the cryogenic pump to be constant by adjusting the valve of the expander and the valve of the cryogenic pump, ensures the stable operation of the expansion power generation system in the optimal state, has the highest unit efficiency, and can prevent the over-high and over-low exhaust pressure;
4. the invention utilizes the compression heat stored in the compression process of the heat exchanger to heat the pre-stage air of the expansion machine so as to improve the work-doing capability of the expansion machine, improve the system efficiency and effectively store the residual energy;
5. the invention also utilizes the electrolysis method to decompose water into hydrogen and oxygen, and outputs the decomposed hydrogen to do work by expansion, thereby effectively improving the power generation efficiency and the energy storage.
Drawings
FIG. 1 is a block diagram of an expansion power generation system of the present invention;
FIG. 2 is an electrolytic subsystem of the present invention;
FIG. 3 is an air and energy operating diagram of the present invention;
FIG. 4 is a control regulation diagram for a cryogenic pump of the present invention;
FIG. 5 is a control and regulation diagram of the heat exchanger of the present invention;
FIG. 6 is a schematic structural view of a cryopump regulation valve of the present invention;
FIG. 7 is a schematic view of the heat transfer oil thermostatic tube of the heat exchanger of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the power generation system of the present invention includes: multi-stage expanders, heat exchangers, evaporators, cryogenic pumps, and the like. The evaporator is respectively connected with the cryogenic pump and the electrolytic subsystem.
The electrolytic subsystem shown in fig. 2 includes: an electrolyzer and a storage module. When the load wave trough of the power system is generated, the electrolysis module electrolyzes water into hydrogen and oxygen through the wave trough power. The memory module further includes: a gas mixer, a hydrogen reservoir, an electrolytic condenser and an oxygen reservoir.
When the load wave crest of the power system is reached, the hydrogen storage device is heated firstly, and when the hydrogen gas is uniformly mixed with the phase component in the gas mixer, the hydrogen gas is introduced into the hydrogen storage device. The temperature of the hydrogen storage device is controlled to be 900-950 ℃, and in the hydrogen storage device, hydrogen and an oxygen carrier are subjected to oxidation-reduction reaction, wherein the oxygen carrier is Fe2O3And generating a mixture of solid-phase iron and gas-phase high-temperature steam and hydrogen for heating air before the first expansion machine, and then enabling the mixture of the high-temperature steam and the hydrogen in the hydrogen storage device to enter an electrolytic condenser to exchange heat with feed water in the electrolytic condenser, so that the high-temperature steam in the mixture is condensed to obtain a gas-phase component with higher concentration. And the condensed water generated after the high-temperature steam is condensed is mixed with the feed water and then enters an electrolyzer for electrolysis. Oxygen electrolyzed in the electrolyzer is stored in the oxygen storage.
Through foretell setting, make the hydrogen water gas mixture that comes out from the hydrogen memory, not through the condenser cooling to make full use of the high temperature energy that the hydrogen memory flowed out, improved the generating performance of system.
The 4-stage expansion machine adopted by the invention adopts a pre-stage reheating mode, so that the working capacity of the expansion machine set can be increased, and the comprehensive efficiency of the system is improved; meanwhile, the total pressure ratio of the four-stage expansion in the invention, namely the ratio of the inlet pressure of the gas from the first stage to the outlet pressure of the gas from the last stage in the whole expansion system, can realize high-pressure ratio expansion and fully release the pressure energy in the air. The heat exchanger between the multiple stages of expansion machines absorbs heat in the compression and liquefaction process and releases heat in the expansion power generation process.
In the invention, the heat exchanger uses the compression heat stored in the compression process to heat the air before the expansion machine, so as to improve the work capacity of the expansion machine and further improve the system efficiency. Since the temperature from the evaporator is low, a heat exchanger is provided at the outlet thereof for preheating.
As shown in fig. 3, the path 1 is a heat running direction, the path 2 is a cooling running direction, the path 3 is an air running direction, the expansion power generation system absorbs heat from the air compression system and receives liquefied air processed by the liquefaction system, and the expansion power generation system releases cooling to the liquefaction system.
The cryogenic pump pressurizes liquefied air stored in a liquid air storage tank in the liquefaction system and then sends the pressurized liquefied air into the evaporator, the liquefied air is gasified and heated to normal temperature by pressurized clean circulating air from a circulating fan in the evaporator, and the liquefied air enters the expansion power generation system to be expanded to do work and generate power and then store residual energy.
After each stage of expander generates electricity, the temperature and the pressure of the high-temperature high-pressure gas are reduced to a certain extent. During this interstage expansion, there is no good way to compensate for the pressure, but the temperature can be exchanged in a heat exchanger by the high temperature heat of the heat storage. Therefore, the temperature of the gas can be raised to a certain extent after each stage of work, the efficiency can be further improved, and the pressure can be fully utilized. Otherwise, after the air passes through each stage of expander, the temperature is reduced, and the air cannot completely work in the later stage of expander, so that the temperature of the gas coming out of the fourth stage of expander is low, the pressure is still high, but the gas is not fully utilized, and the comprehensive efficiency is not high.
In summary, the two reasons for the interstage heating of the present invention are: 1) the recovered compression heat is utilized to increase the temperature, and the work capacity of the expander is increased, so that the system efficiency is improved; 2) the temperature in the expansion machine is prevented from being too low, and the normal and stable work of the expansion machine is prevented from being influenced.
The control process of the expansion power generation system includes: 1) the air flow and the pressure of the expander and the cryogenic pump are respectively controlled to be constant by adjusting a valve of the expander and a valve of the cryogenic pump; 2) the temperature of the air at the outlet of the heat exchanger (namely the temperature of the air at the inlet of each stage of the expansion machine) is controlled to be constant by controlling the opening degree of the regulating valve at the heat exchange medium inlet of the heat exchanger.
As shown in FIG. 4, the present invention controls the outlet pressure of the cryogenic pump to be constant by controlling the variable frequency regulation of the cryogenic pump, wherein the regulator is set to be electrically controlled and manually controlled.
As shown in fig. 6, the cryopump regulating valve includes a left connecting pipe 1, a flow sensor 2, a support frame 3, a first valve 4, an electric control mechanism 5, a manual wheel 6, a second valve 7 and a right connecting pipe 8, wherein the left connecting pipe 1 is welded on the left side of the right connecting pipe 8; one end of the support frame 3 is connected with the lower part of the electric control mechanism 5 through a bolt, and the other end of the support frame is connected with the upper part of the intersection of the left connecting pipe 1 and the right connecting pipe 8 through a bolt; the flow sensor 2 is connected to the middle position of the upper part of the inner wall of the left connecting pipe 1 through a screw; the manual wheel 6 penetrates through the right side of the upper wall of the right connecting pipe 8 and is in threaded connection with the second valve 7; the first valve 4 is in threaded connection with the electric control mechanism 5;
in the electric control state, the pressure control adopts PID adjustment, when the outlet pressure of the cryogenic pump is equal to a set value, the opening of the regulating valve is unchanged, the pressure is higher than the set value, the opening of the regulating valve is increased, the pressure is lower than the set value, and the opening of the regulating valve is decreased. Under the manual control state, the opening of the regulating valve can be arbitrarily set at 0-100% by an operator according to the actual process requirement. When the inlet cut-off valve of the multi-stage expansion machine set is fully opened, the pressure and flow of inlet air entering the set are controlled by the two-stage pressure regulating valve, and the purpose is to control the output power of the set.
The invention ensures the constant air pressure entering the expansion machine by controlling the constant pressure at the outlet of the cryogenic pump, ensures the stable operation of the expansion power generation system in the optimal state, has the highest unit efficiency, and can prevent the situations of overhigh and overlow exhaust pressure. The air flow is controlled to be constant so as to ensure that the work output of the expansion generator is a set value, the expansion generator set works at the set flow value, the efficiency can be optimal, and in addition, when the application scene is required, the variable-load operation of the expansion power generation system can be realized through the nozzle of the expansion machine, the valve regulation and the variable-frequency regulation of the cryogenic pump.
As shown in fig. 5, the inlet flow rate of the heat exchange medium (B in) is controlled by the opening degree of the heat exchanger regulating valve, and the outlet air temperature (a out), that is, the inlet air temperature entering the lower stage expander is controlled. The regulating valve is provided with electric control and manual control, under the electric control state, the temperature control adopts single-loop PID regulation, when the temperature of the heat exchange medium outlet is equal to a set value, the opening of the regulating valve is unchanged, when the temperature is higher than the set value, the opening of the regulating valve is reduced, and when the temperature is lower than the set value, the opening of the regulating valve is increased. Under the manual control state, the opening degree of the heat conducting oil constant temperature pipe of the heat exchanger can be arbitrarily set by an operator according to the actual process requirement at 0-100%.
As shown in fig. 7, the heat-conducting oil thermostatic tube of the heat exchanger comprises an oil guide tube 9, an inlet connecting tube 10, an outlet connecting tube 11, a first temperature sensor 12, a second temperature sensor 13 and a mechanical valve 14, wherein the inlet connecting tube 10 and the outlet connecting tube 11 are respectively welded at the left end and the right end of the oil guide tube 9; the first temperature sensor 12 and the second temperature sensor 13 are respectively connected to the left side and the right side of the upper wall of the oil guide pipe 9 through screws; the mechanical valve 14 is in threaded connection with the middle position of the upper surface of the oil guide pipe 9;
the invention controls the air temperature at the outlet of the heat exchanger (namely the air temperature at the inlet of each stage of expander) to be constant by controlling the opening of the regulating valve at the heat exchange medium inlet of the heat exchanger. The outlet air temperature of the heat exchanger (namely the inlet air temperature of each stage of expander) is controlled to be constant, so that on one hand, the work of the expander can be ensured to be at a set value, on the other hand, the temperature of a heat exchange medium obtained by heat exchange can be controlled to be within a process design range, and the full and reasonable utilization of the cold and heat energy of the system is ensured.
Based on the same inventive concept, the invention also provides a power generation and energy storage system for storing energy by using cryogenic liquefied air, which is explained below.
The system comprises: the system comprises a cryogenic pump, an evaporator, a first heat exchanger and an expander module; the cryogenic pump is used for inputting the liquefied air into the cryogenic pump to obtain pressurized liquefied air; the evaporator is used for inputting the pressurized liquefied air into the evaporator to obtain normal-temperature air; the power generation and energy storage module is used for inputting normal-temperature air into the expander module through the first heat exchanger, performing expansion work to generate power and storing residual energy; the expander module includes at least two expanders.
The first heat exchanger is used for preheating normal-temperature air; and heat exchangers are respectively arranged among the expanders in the expander module, and the heat exchangers heat the pre-stage air input into the expanders.
Each heat exchanger comprises a regulating module; the regulating module controls the flow of heat exchange media by controlling the opening degree of the heat transfer oil constant temperature pipe of the heat exchanger, and controls the outlet temperature of each heat exchanger to be maintained at the same value according to the detected temperature, and the regulating valve comprises: electric control and manual control.
The expander module includes: a pressure flow module; and the pressure and flow module is used for controlling the pressure and flow by utilizing the secondary pressure regulating valve after the inlet cut-off valve of the expansion machine module is fully opened.
The air multistage expansion power generation system further comprises: a liquefied air flow rate constancy module; the liquefied air flow constant module is used for controlling the outlet pressure of the cryogenic pump and the liquefied air flow to be constant by utilizing a regulating valve of the cryogenic pump; its governing valve includes: electric control and manual control.
While the embodiments of the present invention have been disclosed above, it is not limited to the applications listed in the description and embodiments, but is fully applicable to various fields suitable for the present invention, and it will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principle and spirit of the present invention, and therefore the present invention is not limited to the specific details without departing from the general concept defined in the claims and the scope of equivalents thereof.
Claims (9)
1. A multi-stage power generation and energy storage method is characterized by comprising the following steps:
electrolyzing water to obtain hydrogen water mixture gas;
inputting the hydrogen water mixture gas into an expander module, performing expansion work to generate power and storing residual energy;
the expander module comprises at least one expander;
heat exchangers are respectively arranged among all the expanders in the expander module, and the heat exchangers heat the pre-stage gas input into all the expanders;
the heat exchangers control the flow of heat exchange media by controlling the opening of heat transfer oil constant temperature pipes of the heat exchangers, and control the outlet temperatures of the heat exchangers to be maintained at the same value according to the detected temperature;
the cryopump regulator valve includes: electric control and manual control;
when the inlet cut-off valve of the expansion machine module is fully opened, the pressure and the flow are controlled by using a secondary pressure regulating valve;
the cryopump regulator valve includes: electric control and manual control;
when the load wave trough of the power system is generated, electrolyzing water in the power system into hydrogen and oxygen by the electric power of the wave trough;
at the peak of the load of the power system, hydrogen and ferric oxide (Fe)2O3Carrying out oxidation-reduction reaction to generate a mixture gas of hydrogen and water vapor;
the mixed gas of hydrogen and steam generated by the reaction heats the air before the first expander.
2. A multi-stage power generation and energy storage system, comprising: an evaporator, a first heat exchanger, and an expander module;
the evaporator is used for inputting hydrogen water mixed gas obtained by electrolyzing water into the evaporator to obtain normal-temperature air;
the power generation and energy storage module is used for inputting the normal-temperature air into the expander module through the first heat exchanger, performing expansion work to generate power and storing residual energy;
the expander module includes at least two expanders.
3. The multi-stage power-generating and energy-storing system of claim 2,
the first heat exchanger is used for preheating normal-temperature air;
and heat exchangers are respectively arranged among the expanders in the expander module, and the heat exchangers heat the pre-stage gas input into the expanders.
4. The multi-stage power-generating and energy-storing system of claim 3, wherein each heat exchanger comprises a conditioning module;
the adjusting module controls the flow of a heat exchange medium by controlling the opening of a heat transfer oil constant temperature pipe of the heat exchanger, and controls the outlet temperature of each heat exchanger to be maintained at the same value according to the detected temperature;
the cryopump regulator valve includes: electric control and manual control.
5. The multi-stage power generating and energy storage system of claim 3, wherein the expander module comprises: a pressure flow module;
and the pressure and flow module is used for controlling the pressure and flow by utilizing a secondary pressure regulating valve after the inlet shut-off valve of the expansion machine module is fully opened.
6. The multi-stage power-generating and energy-storing system of claim 2,
the cryopump regulator valve includes: electric control and manual control.
7. The multi-stage power generating and energy storage system of claim 2, further comprising: an electrolysis subsystem;
when the load wave trough of the power system is carried out, the electrolysis subsystem electrolyzes water in the power system into hydrogen and oxygen through the wave trough power;
when the electrolytic subsystem is at the load peak of the power system, hydrogen and ferric oxide (Fe)2O3Carrying out oxidation-reduction reaction to generate a mixture gas of hydrogen and water vapor;
the mixed gas of hydrogen and water vapor generated by the reaction enters an evaporator to drive an expander to generate power.
8. The multi-stage power generation and energy storage system according to claim 6, wherein the cryogenic pump regulating valve comprises a left connecting pipe (1), a flow sensor (2), a support frame (3), a first valve (4), an electric control mechanism (5), a manual wheel (6), a second valve (7) and a right connecting pipe (8), and the left connecting pipe (1) is welded on the left side of the right connecting pipe (8); one end of the support frame (3) is connected with the lower part of the electric control mechanism (5) through a bolt, and the other end of the support frame is connected with the upper part of the intersection of the left connecting pipe (1) and the right connecting pipe (8) through a bolt; the flow sensor (2) is in screwed connection with the middle position of the upper part of the inner wall of the left connecting pipe (1); the manual wheel (6) penetrates through the right side of the upper wall of the right connecting pipe (8) and is in threaded connection with the second valve (7); the first valve (4) is in threaded connection with the electric control mechanism (5).
9. The multi-stage power generation and energy storage system according to claim 4, wherein the heat exchanger heat conduction oil thermostatic tube comprises an oil guide tube (9), an inlet connecting tube (10), an outlet connecting tube (11), a first temperature sensor (12), a second temperature sensor (13) and a mechanical valve (14), and the inlet connecting tube (10) and the outlet connecting tube (11) are respectively welded at the left end and the right end of the oil guide tube (9); the first temperature sensor (12) and the second temperature sensor (13) are respectively in screwed connection with the left side and the right side of the upper wall of the oil guide pipe (9); the mechanical valve (14) is in threaded connection with the middle position of the upper surface of the oil guide pipe (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910971059.8A CN110685759A (en) | 2019-11-07 | 2019-11-07 | Multistage power generation and energy storage method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910971059.8A CN110685759A (en) | 2019-11-07 | 2019-11-07 | Multistage power generation and energy storage method and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110685759A true CN110685759A (en) | 2020-01-14 |
Family
ID=69112480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910971059.8A Pending CN110685759A (en) | 2019-11-07 | 2019-11-07 | Multistage power generation and energy storage method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110685759A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114856744A (en) * | 2022-05-12 | 2022-08-05 | 西安交通大学 | Transcritical carbon dioxide energy storage system and method based on oil and gas well |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101555877A (en) * | 2008-04-08 | 2009-10-14 | 江苏神通阀门股份有限公司 | Flow-stabilizing regulating and controlling device of sea water pump |
| CN104481617A (en) * | 2014-11-03 | 2015-04-01 | 东南大学 | Energy storing device based on redox reaction and energy storing method and generating method thereof |
| CN105781644A (en) * | 2016-03-09 | 2016-07-20 | 贾晓轻 | Energy storage power generation device and control method |
| CN107060921A (en) * | 2017-06-16 | 2017-08-18 | 华北电力科学研究院有限责任公司 | The TRT and method of liquefied air energy-storage system |
| CN208804890U (en) * | 2018-09-04 | 2019-04-30 | 深圳市大震热能技术有限公司 | A kind of automatic heating and automatic cooling temperature control system |
| CN208887113U (en) * | 2018-09-17 | 2019-05-21 | 新乡市通达公路新科技有限公司 | A kind of Oil Guide furnace of novel energy-saving environment-friendly |
| CN110566294A (en) * | 2019-09-24 | 2019-12-13 | 湖南匡楚科技有限公司 | power generation and energy storage method and system |
| CN110630344A (en) * | 2019-09-11 | 2019-12-31 | 湖南匡楚科技有限公司 | Power generation and energy storage method and system |
-
2019
- 2019-11-07 CN CN201910971059.8A patent/CN110685759A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101555877A (en) * | 2008-04-08 | 2009-10-14 | 江苏神通阀门股份有限公司 | Flow-stabilizing regulating and controlling device of sea water pump |
| CN104481617A (en) * | 2014-11-03 | 2015-04-01 | 东南大学 | Energy storing device based on redox reaction and energy storing method and generating method thereof |
| CN105781644A (en) * | 2016-03-09 | 2016-07-20 | 贾晓轻 | Energy storage power generation device and control method |
| CN107060921A (en) * | 2017-06-16 | 2017-08-18 | 华北电力科学研究院有限责任公司 | The TRT and method of liquefied air energy-storage system |
| CN208804890U (en) * | 2018-09-04 | 2019-04-30 | 深圳市大震热能技术有限公司 | A kind of automatic heating and automatic cooling temperature control system |
| CN208887113U (en) * | 2018-09-17 | 2019-05-21 | 新乡市通达公路新科技有限公司 | A kind of Oil Guide furnace of novel energy-saving environment-friendly |
| CN110630344A (en) * | 2019-09-11 | 2019-12-31 | 湖南匡楚科技有限公司 | Power generation and energy storage method and system |
| CN110566294A (en) * | 2019-09-24 | 2019-12-13 | 湖南匡楚科技有限公司 | power generation and energy storage method and system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114856744A (en) * | 2022-05-12 | 2022-08-05 | 西安交通大学 | Transcritical carbon dioxide energy storage system and method based on oil and gas well |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110598301B (en) | Parameter coupling design method for liquefied air energy storage system | |
| CN110171553B (en) | Comprehensive utilization system for waste heat of hydrogen fuel cell power ship | |
| WO2019114536A1 (en) | Constructed cold source energy recovery system, heat engine system and energy recovery method | |
| CN108386719B (en) | A kind of pipe natural gas pressure energy cold energy comprehensive utilization device and method | |
| RU2698865C1 (en) | Control method and apparatus for generating mechanical and thermal energy | |
| CN110566294A (en) | power generation and energy storage method and system | |
| CN113503192A (en) | High-efficiency nuclear energy comprehensive utilization system capable of realizing flexible peak regulation of nuclear power station | |
| CN110685759A (en) | Multistage power generation and energy storage method and system | |
| CN109944650B (en) | Combined cooling, heating and power system and method containing supercritical compressed air energy storage | |
| CN110630344A (en) | Power generation and energy storage method and system | |
| CN111396291B (en) | Compressed gas waste heat recovery power generation system | |
| RU2665794C1 (en) | Method and plant for mechanical and thermal energy generation | |
| CN111894688A (en) | Air multistage expansion power generation system and method | |
| CN114991895B (en) | Coal-fired power generation unit capable of storing energy by coupling compressed air and operation method thereof | |
| CN117293349A (en) | Hydrogen-heat integrated power generation system and method based on PEMFC and organic Rankine cycle | |
| CN114935112B (en) | Flue gas recovery system of LNG solid oxide fuel cell power ship | |
| RU2651918C1 (en) | Method and plant for mechanical and thermal energy generation | |
| CN114382565B (en) | Energy storage power generation system with combined cooling, heating and power | |
| CN116624766A (en) | Liquid carbon dioxide energy storage system based on waste heat recovery of thermal power generating unit | |
| CN113394431B (en) | Thermal management system and method for improving utilization efficiency of green hydrogen energy system | |
| CN114991891A (en) | Compressed air energy storage system and method | |
| CN114922705B (en) | System and method for circulating split-flow repressing supercritical carbon dioxide | |
| CN114233419B (en) | Thermoelectric cooperative system integrated with compressor unit and operation method | |
| CN113513710B (en) | Multistage utilization and peak shaving system for natural gas pressure energy | |
| CN218117870U (en) | Two-stage industrial steam supply system based on steam heat source |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200114 |