CN117294027B - Energy storage system - Google Patents
Energy storage system Download PDFInfo
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- CN117294027B CN117294027B CN202311552464.9A CN202311552464A CN117294027B CN 117294027 B CN117294027 B CN 117294027B CN 202311552464 A CN202311552464 A CN 202311552464A CN 117294027 B CN117294027 B CN 117294027B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 101
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 264
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 132
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 132
- OKKJLVBELUTLKV-UHFFFAOYSA-N methanol Substances OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 128
- 239000007789 gas Substances 0.000 claims abstract description 90
- 238000003860 storage Methods 0.000 claims abstract description 65
- 239000007788 liquid Substances 0.000 claims abstract description 51
- 238000000034 method Methods 0.000 claims abstract description 40
- 230000008569 process Effects 0.000 claims abstract description 37
- 239000002253 acid Substances 0.000 claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 239000002918 waste heat Substances 0.000 claims abstract description 12
- 239000003245 coal Substances 0.000 claims description 21
- 238000002309 gasification Methods 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 239000010866 blackwater Substances 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 238000003786 synthesis reaction Methods 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 abstract description 6
- 230000008878 coupling Effects 0.000 abstract description 5
- 238000010168 coupling process Methods 0.000 abstract description 5
- 238000005859 coupling reaction Methods 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 5
- 230000005611 electricity Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000001816 cooling Methods 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000003795 desorption Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000001311 chemical methods and process Methods 0.000 description 2
- 238000012824 chemical production Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 239000011555 saturated liquid Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
- H02J15/006—Systems for storing electric energy in the form of pneumatic energy, e.g. compressed air energy storage [CAES]
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention relates to an energy storage system, which comprises a liquid storage tank, an energy release module, an air storage warehouse and an energy storage module which are sequentially connected in a closed loop, wherein the energy storage system also comprises a coal-to-methanol component, and the energy storage system comprises the following components: the coal-to-methanol component comprises a flash tower and an acid gas removal unit, wherein the flash tower is connected with the energy storage module and/or the energy release module and is used for generating and providing a heat source, and the acid gas removal unit is connected with the gas storage and is used for generating and providing high-purity carbon dioxide so as to effectively recycle the carbon dioxide in the working process of the coal-to-methanol component; the heat source generated by the flash tower can provide heat required by the processes of preheating, evaporating, heating and the like in the energy storage stage and/or the energy release stage so as to effectively utilize the waste heat in the working process of the coal-to-methanol component; therefore, the energy utilization rate is improved and the production cost is saved by coupling the technological process of the coal-to-methanol component in the energy storage stage and the energy release stage.
Description
Technical Field
The invention relates to the technical field of energy storage, in particular to an energy storage system.
Background
At present, the energy storage technology based on the carbon dioxide gas-liquid phase-change circulation is used for compressing and condensing gaseous carbon dioxide at normal temperature and normal pressure in a gas storage in a low electricity consumption period into liquid carbon dioxide to be stored in a liquid storage tank, heating the liquid carbon dioxide to be in a gaseous state by utilizing heat energy in an electricity consumption peak period, driving a turbine by the gaseous carbon dioxide to drive a generator to generate electricity, and returning the gaseous carbon dioxide after acting back to the gas storage tank for recycling, so that the energy storage technology is a gas-liquid phase-change synergistic energy storage technology which does not depend on geological conditions, has long service life and high reliability and low cost, and can be used for supporting peak clipping and valley filling, frequency modulation, phase modulation of a power grid, providing a standby power supply for the power grid and the like. At present, a large amount of carbon dioxide is generated in the coal-to-methanol which is developed on a large scale, the economic benefit of utilizing the carbon dioxide is low, and the low-temperature waste heat generated in the coal-to-methanol process is difficult to recycle in industrial production due to low temperature.
Therefore, providing a cost-effective energy storage system is a technical problem to be solved.
Disclosure of Invention
Based on the above, it is necessary to provide an energy storage system, which is capable of improving the energy utilization rate and saving the production cost by coupling the technical process of industrial methanol production into the energy storage and release process to utilize the waste heat and carbon dioxide of industrial methanol production in the energy storage and release process.
The invention provides an energy storage system, which comprises a liquid storage tank, an energy release module, an air storage warehouse and an energy storage module which are sequentially connected in a closed loop, wherein the energy storage system further comprises a coal-to-methanol component, and the energy storage system comprises the following components:
the coal-to-methanol component comprises a flash tower and an acid gas removal unit, wherein the flash tower is connected with the energy storage module and/or the energy release module and is used for generating and providing a heat source, and the acid gas removal unit is connected with the gas storage and is used for generating and providing high-purity carbon dioxide.
When the energy storage system works, the coal-to-methanol component is started, the flash tower generates a heat source, the acid gas removal unit generates high-purity carbon dioxide at normal temperature and normal pressure, the high-purity carbon dioxide at normal temperature and normal pressure is supplemented into the gas storage, so that the carbon dioxide in the working process of the coal-to-methanol component can be effectively recovered, and the recovered carbon dioxide is used in an energy storage and energy release cycle; in the energy storage stage, the carbon dioxide stored in the gas storage warehouse at normal temperature and normal pressure enters the energy storage module, and in the valley electricity stage, the electric drive energy storage module converts the carbon dioxide at normal temperature and normal pressure into high-pressure liquid carbon dioxide, and the high-pressure liquid carbon dioxide is stored in the liquid storage tank; in the energy release stage, the high-pressure liquid carbon dioxide stored in the liquid storage tank enters an energy release module, and the energy release module firstly converts the high-pressure liquid carbon dioxide into high-temperature high-pressure carbon dioxide, and converts the high-temperature high-pressure carbon dioxide into normal-temperature normal-pressure carbon dioxide after expansion work, and the normal-temperature normal-pressure carbon dioxide flows back and is stored in the gas storage; the heat source generated by the flash tower can provide heat required by the technical processes of preheating, evaporating, heating and the like in the energy storage stage and/or the energy release stage so as to effectively utilize the waste heat in the working process of the coal-to-methanol component; therefore, the energy storage system improves the energy utilization rate and saves the production cost through the technical process of coupling the coal-to-methanol component in the energy storage stage and the energy release stage.
In one embodiment, the energy release module comprises an evaporator connected to the flash column.
In one embodiment, the energy storage module further comprises a preheater, the preheater being connected to the flash column.
In one embodiment, the coal-to-methanol assembly further comprises a cryogenic unit connected to the energy storage module and/or the energy release module and configured to generate and provide a source of cold.
In one embodiment, the energy storage module includes a condenser, and the cryogenic unit is connected to the condenser and is configured to provide a source of cold to the condenser.
In one embodiment, the energy release module comprises a heat regenerator, and the cryogenic unit is connected with the heat regenerator and is used for providing a cold source for the heat regenerator.
In one embodiment, the acid gas removal unit includes a carbon dioxide stripping column for removing impurities other than carbon dioxide to form high purity carbon dioxide.
In one embodiment, the energy release module further comprises a heater, a turbine and a generator, wherein the heater and the turbine are sequentially connected between the liquid storage tank and the gas storage, the turbine is further connected with the generator and is used for performing expansion work by using gaseous carbon dioxide from the heater, and the generator is electrically connected with the coal methanol component and is used for generating electricity when driven by expansion work of the turbine and inputting the electricity to the coal methanol component.
In one embodiment, the coal-to-methanol assembly further comprises an air separation unit for extracting oxygen from air, and a pressurized gasification unit connected to the air separation unit and the flash tower for thermally processing the coal to form a raw syngas that is fed to the flash tower for recovering heat from the pressurized gasification unit and the raw syngas during the flash.
In one embodiment, the flash column comprises a low pressure black water flash column and/or a syngas flash column.
Drawings
FIG. 1 is a schematic diagram of an energy storage system according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of an energy storage system according to a second embodiment of the present invention;
FIG. 3 is a schematic diagram of an energy storage system according to a third embodiment of the present invention;
FIG. 4 is a schematic diagram of an energy storage system according to a fourth embodiment of the present invention;
FIG. 5 is a schematic diagram of an energy storage system according to a fifth embodiment of the present invention;
FIG. 6 is a schematic diagram of an energy storage system according to a sixth embodiment of the present invention;
fig. 7 is a schematic structural diagram of an energy storage system according to a seventh embodiment of the present invention.
Reference numerals:
10. an energy storage system;
100. a liquid storage tank;
200. an energy release module; 210. an evaporator; 220. a heater; 230. a turbine; 240. a generator; 250. a regenerator;
300. a gas storage;
400. an energy storage module; 410. a condenser; 420. a compressor; 430. a preheater; 440. a cooler;
500. a coal methanol component; 510. a flash column; 520. an acid gas removal unit; 521. a carbon dioxide analysis tower; 530. a cryogenic unit; 540. a space division unit; 550. a pressurized gasification unit;
600. methanol;
700. a heat source;
800. carbon dioxide;
900. a cold source;
20. a coal-containing working medium.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
The following describes the technical scheme provided by the embodiment of the invention with reference to the accompanying drawings.
An energy storage system for storing energy based on carbon dioxide gas-liquid phase circulation in the prior art, for example, in the prior patent CN112985145a, comprises a liquid storage tank, an energy release module, a gas storage and an energy storage module, wherein the liquid storage tank, the energy release module, the gas storage and the energy storage module are connected in a closed loop through a pipeline. The gas storage is used as a storage device of gaseous carbon dioxide and is used for storing the carbon dioxide at normal temperature and normal pressure; the energy storage module is used as an energy conversion component and is used for converting the carbon dioxide at normal temperature and normal pressure flowing out of the gas storage into high-pressure liquid carbon dioxide and converting electric energy into pressure energy and heat energy in the conversion process so as to realize energy storage; the liquid storage tank is used as a storage device of liquid carbon dioxide and is used for storing high-pressure liquid carbon dioxide; the energy release module is used as an energy conversion component and is used for converting high-pressure liquid carbon dioxide flowing out of the liquid storage tank into normal-temperature normal-pressure carbon dioxide, converting heat energy and pressure energy into electric energy in the conversion process, and releasing and utilizing the stored energy.
As shown in fig. 1, 2 and 3, the energy storage system in the prior art is improved, and the improved energy storage system 10 adds a coal-to-methanol component 500 on the basis of an original liquid storage tank 100, an energy release module 200, an air storage tank 300 and an energy storage module 400, wherein the coal-to-methanol component 500 is used for generating methanol 600 by using coal, and carbon dioxide 800 and waste heat are generated in the methanol 600 generation process. According to the energy storage system 10 provided by the invention, the deep coupling of the carbon dioxide gas-liquid phase circulation and the industrial methanol preparation is realized, so that the energy storage and the methanol preparation are simultaneously carried out, the carbon dioxide 800 and the waste heat associated in the methanol preparation are utilized in the energy storage process, the energy utilization rate is improved, and the production cost is saved. However, since the specific structures of the liquid storage tank 100, the energy releasing module 200, the gas storage 300 and the energy storage module 400 are not improved, the existing structures, such as the liquid storage tank (the liquid storage tank 100 of the present invention), the energy releasing assembly (the energy releasing module 200 of the present invention), the gas storage (the gas storage 300 of the present invention) and the energy storage assembly (the energy storage module 400 of the present invention) in the existing patent CN112985145a may be adopted.
As shown in fig. 4, the energy storage module 400 includes a condenser 410, a compressor 420, a preheater 430, and a cooler 440. The preheater 430, the compressor 420, the cooler 440, and the condenser 410 are sequentially disposed from the air reservoir 300 toward the liquid storage tank 100, and are integrally connected by pipes. The preheater 430 is used for heating up the carbon dioxide 800 at normal temperature and normal pressure input from the gas storage 300, the compressor 420 is used for compressing the carbon dioxide 800 in the energy storage process, the cooler 440 is used for cooling down the compressed carbon dioxide 800, and the condenser 410 is used for condensing the carbon dioxide 800 in the energy storage process.
The energy release module 200 comprises an evaporator 210, a heater 220, a turbine 230, a generator 240 and a heat regenerator 250, wherein the evaporator 210, the heater 220, the turbine 230 and the heat regenerator 250 are sequentially arranged from the liquid storage tank 100 to the direction of the gas storage 300 and are connected into a whole through pipelines. The evaporator 210 is used for evaporating high-pressure liquid carbon dioxide 800 in the energy release process, the heater 220 is used for carrying out heat exchange and temperature rise on the evaporated carbon dioxide 800, the turbine 230 is used for carrying out expansion work by utilizing the high-temperature high-pressure carbon dioxide 800, the generator 240 is connected with the turbine 230 and is used for generating electricity when being driven by the expansion work of the turbine 230, and the regenerator 250 is used for cooling the carbon dioxide 800 in the energy release process.
In the energy storage system 10 provided by the present invention, as shown in fig. 4, the coal-to-methanol assembly 500 includes a flash column 510, and the flash column 510 is used to recover heat from the methanol production process by the flash process and generate the heat into a heat source 700. When specifically provided, heat source 700 may be hot steam, hot water, or the like. The flash tower is chemical equipment for separating gas from liquid in chemical production process and is used to convert high pressure saturated liquid into low pressure saturated steam and saturated liquid. According to the different materials processed in the chemical production process, the method can be divided into a low-pressure black water flash tower and a synthetic gas flash tower, wherein the low-pressure black water flash tower flashes black water generated in the chemical process into steam, the steam and hot water are used as a heat source 700, the synthetic gas flash tower flashes water gas generated in the chemical process into synthetic gas, and hot steam formed by the synthetic gas is used as the heat source 700. For the coal-to-methanol assembly 500 of the present invention, the flash column 510 may be a low pressure black water flash column, a syngas flash column, a combination of a low pressure black water flash column and a syngas flash column, or other structural forms that may meet the requirements.
The flash column 510 is configured in three ways: in one mode, as shown in fig. 1, a flash tower 510 is connected to an energy storage module 400 through a pipe, and the flash tower 510 is used for providing a heat source 700 to the energy storage module 400; in a second mode, as shown in fig. 2, the flash tower 510 is connected to the energy release module 200 through a pipeline, and the flash tower 510 is used for providing the heat source 700 to the energy release module 200; in a third mode, as shown in fig. 3, the flash tower 510 is connected to the energy storage module 400 and the energy release module 200 through pipes, and the flash tower 510 provides the heat source 700 to the energy storage module 400 and the energy release module 200, respectively.
In the energy storage system 10 provided by the invention, as shown in fig. 4, the coal-to-methanol assembly 500 further comprises an acid gas removal unit 520, wherein the acid gas removal unit 520 is used for removing acidic components such as hydrogen sulfide, carbon dioxide and the like from the gas generated in the methanol preparation process, so as to form the high-purity carbon dioxide 800. When the device is specifically arranged, the acid gas removal unit is taken as a special waste gas treatment device for treating acid gas, and can be divided into an acid gas absorption tower, a carbon dioxide desorption tower and a carbon dioxide stripping tower according to different treatment methods in the treatment process, wherein the acid gas absorption tower is used for absorbing acid gas except carbon dioxide, the carbon dioxide desorption tower is used for decompressing and desorbing carbon dioxide, and the carbon dioxide stripping tower is used for extracting carbon dioxide from the synthesis gas. For the coal-to-methanol assembly 500 of the present invention, the acid gas removal unit 520 may be one of an acid gas absorption tower, a carbon dioxide desorption tower, and a carbon dioxide stripping tower, or may be a combination of the acid gas absorption tower, the carbon dioxide desorption tower, and the carbon dioxide stripping tower, or may be any other structural form capable of meeting the requirements. The acid gas removal unit 520 is connected to the gas storage 300 through a pipe, and the acid gas removal unit 520 is used to supply the high purity carbon dioxide 800 to the gas storage 300.
When the energy storage system 10 works, the coal-to-methanol assembly 500 is started, the flash tower 510 generates the heat source 700, the acid gas removal unit 520 generates high-purity carbon dioxide 800 at normal temperature and normal pressure, and the high-purity carbon dioxide 800 at normal temperature and normal pressure is supplemented into the gas storage 300, so that the carbon dioxide 800 in the working process of the coal-to-methanol assembly 500 can be effectively recovered, and the recovered carbon dioxide 800 is used in the energy storage and release cycle; in the energy storage stage, carbon dioxide 800 at normal temperature and normal pressure (the temperature is in the range of-40-70 ℃ and the pressure difference between the pressure and the external atmosphere is less than 1000Pa, for example) stored in the gas storage 300 enters the energy storage module 400, the energy storage module 400 is electrically driven to convert the carbon dioxide 800 at normal temperature and normal pressure into carbon dioxide 800 in a high-pressure liquid state (the temperature is 20-30 ℃ and the pressure is 4-7.5 MPa) in the valley period, and the carbon dioxide 800 in the high-pressure liquid state is stored in the liquid storage tank 100; in the energy release stage, the high-pressure liquid carbon dioxide 800 stored in the liquid storage tank 100 enters the energy release module 200, the energy release module 200 firstly converts the high-pressure liquid carbon dioxide 800 into high-temperature high-pressure (the temperature reaches more than 150 ℃ and the pressure is between 4MPa and 7.5 MPa) carbon dioxide 800, and the high-temperature high-pressure carbon dioxide 800 expands to do work and then converts the work into normal-temperature normal-pressure carbon dioxide 800, and the normal-temperature normal-pressure carbon dioxide 800 flows back and is stored in the gas storage 300; the heat source 700 generated by the flash tower 510 can provide heat required by the technical processes of preheating, evaporating, heating and the like in the energy storage stage and/or the energy release stage, so that the waste heat in the working process of the coal-to-methanol assembly 500 can be effectively utilized; therefore, the energy storage system 10 improves the energy utilization rate and saves the production cost by coupling the technological process of the coal-to-methanol assembly 500 in the energy storage stage and the energy release stage.
In addition to providing heat source 700 and carbon dioxide 800, coal-based methanol module 500 also produces other associated products, and in a preferred embodiment, as shown in fig. 4, 5, 6, and 7, coal-based methanol module 500 further includes a cryogenic unit 530, where cryogenic unit 530 mechanically cools the gas produced during the methanol production process and separates methanol 600 using different boiling points, while forming a small amount of low temperature residual cold, which is utilized as cold source 900. The cryogenic unit 530 is connected to the energy storage module 400 and/or the energy release module 200, and the cryogenic unit 530 is used to provide a cold source 900 to the energy storage module 400 and/or the energy release module 200. In a specific arrangement, the cold source 900 is cold water. In the coal-to-methanol assembly 500 of the present application, the cryogenic unit 530 may be a low-temperature rectifying tower, or may be other structural forms that can meet the requirements.
Specifically, coal methanol assembly 500 provides the cooling capacity required by condenser 410 during the condensation process. The cryogenic unit 530 is connected to the condenser 410 through a pipe, and the cryogenic unit 530 provides the condenser 410 with the cold source 900. In a specific setting, the condenser 410 is disposed at the inlet of the liquid storage tank 100, the compressor 420 is driven by electricity in the valley period to compress the carbon dioxide 800, the carbon dioxide 800 is boosted and then enters the condenser 410 to be condensed, and the condensed carbon dioxide 800 is converted into a high-pressure liquid state to be stored in the liquid storage tank 100.
Specifically, coal methanol assembly 500 provides the cooling capacity required by regenerator 250 during the cool down process. The cryogenic unit 530 is connected with the heat regenerator 250 through a pipeline, and the cryogenic unit 530 provides a cold source 900 for the heat regenerator 250. In a specific arrangement, the regenerator 250 is arranged at the inlet of the gas storage 300, the carbon dioxide 800 after expansion work enters the regenerator 250 for cooling, and the cooled carbon dioxide 800 is stored in the gas storage 300.
When the energy storage system 10 works, the cryogenic unit 530 generates the cold source 900, the cold source 900 enters the condenser 410 and the regenerator 250, the carbon dioxide 800 stored in the gas storage 300 at normal temperature and normal pressure enters the energy storage module 400 in the energy storage stage, the compressor 420 compresses the carbon dioxide 800, the boosted carbon dioxide 800 exchanges heat with the cold source 900 in the condenser 410 to cool, and the carbon dioxide 800 converted into high-pressure liquid is stored in the liquid storage tank 100. In the energy release stage, the high-pressure liquid carbon dioxide 800 stored in the liquid storage tank 100 enters the energy release module 200, is firstly converted into high-temperature high-pressure carbon dioxide 800, is converted into high-temperature normal-pressure carbon dioxide 800 after expansion work, finally enters the heat regenerator 250 for cooling, and the cooled carbon dioxide 800 is stored in the gas storage 300. The cold source 900 generated by the cryogenic unit 530 can quickly realize the gas-liquid phase change of the carbon dioxide 800, improve the circulation efficiency of the energy storage system 10, effectively utilize the residual cold in the working process of the coal-to-methanol assembly 500, and improve the energy utilization rate.
The source of heat source 700 takes a variety of forms, and in a preferred embodiment, heat source 700 is derived from the waste flash gas heat formed by flash column 510. In a specific arrangement, flash vapor is formed in the flash tower 510 during the industrial methanol 600 production process, the flash tower 510 recovers the flash vapor formed, and the residual heat in the recovered flash vapor is collected to form the heat source 700. Of course, heat source 700 is not limited to the above-described flash gas waste heat, and may include other residual low-quality waste heat in the plant where energy storage system 10 is located, and may be steam waste heat in the process of industrial production of methanol 600.
When the energy storage system 10 works, the yield of the residual heat of the flash gas formed by the flash tower 510 is high, and the residual heat of the flash gas formed by the flash tower 510 is used as the heat source 700, so that a stable heat source can be provided, a great amount of heat waste is avoided, and the energy utilization rate is improved.
To facilitate the flash tower 510 providing the heat source 700 to the energy release module 200, specifically, as shown in fig. 4, the evaporator 210 is connected to the flash tower 510 through a pipe, the evaporator 210 is used for receiving the residual flash gas heat, and the evaporator 210 uses the residual flash gas heat to evaporate the high-pressure liquid carbon dioxide 800 during the energy release process. In a specific setting, in the energy release stage, carbon dioxide 800 is evaporated by the evaporator 210, then enters the heater 220 to perform heat exchange and temperature rise, high-temperature and high-pressure carbon dioxide 800 enters the turbine 230 to expand and apply work, and the carbon dioxide 800 after the work is performed enters the gas storage 300.
When the energy storage system 10 works, the residual heat of the flash gas in the flash tower 510 enters the evaporator 210 and is used as the heat source 700 in the evaporator 210, the high-pressure liquid carbon dioxide 800 stored in the liquid storage tank 100 enters the evaporator 210 and exchanges heat with the heat source 700 in the evaporator 210 to raise the temperature and convert the high-pressure liquid carbon dioxide into the high-temperature high-pressure carbon dioxide 800, so that the residual heat of the flash gas can be effectively utilized in the energy release module 200.
To facilitate the flash tower 510 to provide the heat source 700 to the energy storage module 400, specifically, as shown in fig. 4, the preheater 430 is connected to the flash tower 510 through a pipe, the preheater 430 is used to receive the residual flash gas heat, and the preheater 430 is used to preheat the carbon dioxide 800 at normal temperature and pressure using the residual flash gas heat in the energy storage process. In a specific setting, in the energy storage stage, the carbon dioxide 800 at normal temperature and normal pressure is heated by the preheater 430 and then enters the compressor 420, the compressor 420 compresses the carbon dioxide 800, the formed high-temperature and high-pressure carbon dioxide 800 enters the cooler 440, the temperature in the cooler 440 is reduced to be the high-pressure and low-temperature carbon dioxide 800, the high-pressure and low-temperature carbon dioxide 800 enters the condenser 410 to be condensed, and the high-pressure and low-temperature carbon dioxide 800 is converted into the high-pressure liquid carbon dioxide 800 after condensation.
When the energy storage system 10 works, the residual heat of the flash gas in the flash tower 510 enters the preheater 430 and is used as the heat source 700 in the preheater 430, and the carbon dioxide 800 stored in the gas storage 300 at normal temperature and normal pressure enters the preheater 430 and exchanges heat with the heat source 700 in the preheater 430 to raise the temperature and convert the heat into the carbon dioxide 800 at high temperature and normal pressure, so that the residual heat of the flash gas can be effectively utilized in the energy release module 200.
In order to improve the purity of the carbon dioxide 800, in a preferred embodiment, as shown in fig. 4, the acid gas removal unit 520 includes a carbon dioxide analyzing tower 521, and the carbon dioxide analyzing tower 521 is used to treat a methanol solution rich in the carbon dioxide 800, remove the carbon dioxide 800 therefrom, and remove impurities other than the carbon dioxide 800 to form high-purity carbon dioxide 800. When the energy storage system 10 works, the high-purity carbon dioxide 800 formed by the acid gas removal unit 520 is stored in the gas storage 300 and is used as a working medium in the energy storage stage and the energy release stage, so that the operation stability, the circulation efficiency and the reliability of the whole energy storage system 10 are high.
In order to further increase the energy utilization rate, in a preferred embodiment, as shown in fig. 4, the generator 240 is connected to the coal-based methanol module 500, and the electric power generated by the generator 240 is used as the electric energy of the coal-based methanol module 500. When the device specifically works, after the carbon dioxide 800 is evaporated by the evaporator 210, the carbon dioxide 800 enters the heater 220 to perform heat exchange and temperature rise, the high-temperature and high-pressure carbon dioxide 800 enters the turbine 230 to perform expansion work, the expansion work of the turbine 230 drives the generator 240 to perform power generation, the carbon dioxide 800 after the work enters the gas storage 300, part of the power generated by the generator 240 can be connected into a power grid, and the other part can be used as electric energy required in the process of preparing methanol by the coal-to-methanol assembly 500, so that the energy utilization rate is further improved, and the production cost is saved.
To facilitate the operation of the flash tower 510, more specifically, as shown in fig. 4, the coal-to-methanol assembly 500 further includes an air separation unit 540 and a pressurized gasification unit 550, where the air separation unit 540 is configured to separate oxygen from nitrogen in air, so as to extract oxygen in air, and use the oxygen as a working medium in a subsequent methanol preparation process. The pressurized gasification unit 550 is connected with the air separation unit 540 and the flash tower 510 through pipelines, and the pressurized gasification unit 550 is used for carrying out thermal processing on the coal-containing working medium 20 such as coal or coke oven gas and the like and oxygen in combination to form crude synthesis gas, and the crude synthesis gas is conveyed to the flash tower 510, wherein the crude synthesis gas contains acidic components such as hydrogen sulfide, carbon dioxide and the like and high Wen Heishui. In operation of the energy storage system 10, the air separation unit 540 forms oxygen by using air, the pressurized gasification unit 550 generates raw synthesis gas by using oxygen and the coal-containing working medium 20, and the raw synthesis gas is sent to the flash evaporation tower 510, and then heat contained in black water discharged from the gasification furnace and the washing tower is recovered through a flash evaporation process to generate the heat source 700.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (4)
1. The utility model provides an energy storage system, its characterized in that, including closed loop connection's liquid storage pot, energy release module, gas storage storehouse and energy storage module in proper order, energy storage system still includes coal system methyl alcohol subassembly, coal system methyl alcohol subassembly is used for utilizing coal to generate methyl alcohol, and in the methyl alcohol production in-process accompanies and produces low temperature waste heat and contains carbon dioxide's gas, wherein:
the coal-to-methanol component comprises a flash tower and an acid gas removal unit, wherein the flash tower is connected with the energy storage module and/or the energy release module and is used for generating and providing a heat source by utilizing the low-temperature waste heat, and the acid gas removal unit is connected with the gas storage and is used for generating and providing high-purity carbon dioxide by utilizing the gas containing carbon dioxide;
the energy release module comprises an evaporator, and the evaporator is connected with the flash tower;
the energy storage module comprises a preheater, and the preheater is connected with the flash tower;
the coal-to-methanol assembly further comprises a cryogenic unit, wherein the cryogenic unit is connected with the energy storage module and/or the energy release module and is used for generating and providing a cold source;
the energy storage module comprises a condenser, and the cryogenic unit is connected with the condenser and is used for providing a cold source for the condenser;
the energy release module comprises a heat regenerator, and the cryogenic unit is connected with the heat regenerator and is used for providing a cold source for the heat regenerator;
the coal-to-methanol component further comprises an air separation unit and a pressurized gasification unit, wherein the air separation unit is used for extracting oxygen in air, the pressurized gasification unit is connected with the air separation unit and the flash tower and is used for carrying out hot processing on coal to form crude synthesis gas which is conveyed to the flash tower, and the flash tower is used for recovering heat of the pressurized gasification unit and the crude synthesis gas in the flash process.
2. The energy storage system of claim 1, wherein the acid gas removal unit comprises a carbon dioxide stripping column for removing impurities other than carbon dioxide to form high purity carbon dioxide.
3. The energy storage system of claim 1, wherein the energy release module further comprises a heater, a turbine, and a generator, the heater, the turbine being connected in sequence between the liquid storage tank and the gas storage reservoir, the turbine being further connected to the generator and configured to perform expansion work using gaseous carbon dioxide from the heater, the generator being electrically connected to the coal methanol component and configured to generate and input electrical power to the coal methanol component when driven by the expansion work of the turbine.
4. The energy storage system of claim 1, wherein the flash column comprises a low pressure black water flash column and/or a syngas flash column.
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Denomination of invention: Energy storage system Granted publication date: 20240319 Pledgee: China Minsheng Banking Corp Shenzhen branch Pledgor: Baihe new energy technology (Shenzhen) Co.,Ltd. Registration number: Y2024980042337 |