CN117924027A - System for generating power and preparing methanol by utilizing carbon dioxide energy storage - Google Patents
System for generating power and preparing methanol by utilizing carbon dioxide energy storage Download PDFInfo
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- CN117924027A CN117924027A CN202211262185.4A CN202211262185A CN117924027A CN 117924027 A CN117924027 A CN 117924027A CN 202211262185 A CN202211262185 A CN 202211262185A CN 117924027 A CN117924027 A CN 117924027A
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 384
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 334
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 167
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 167
- 238000004146 energy storage Methods 0.000 title claims abstract description 68
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 53
- 239000001257 hydrogen Substances 0.000 claims abstract description 51
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 238000003860 storage Methods 0.000 claims abstract description 41
- 238000010248 power generation Methods 0.000 claims abstract description 34
- 230000005611 electricity Effects 0.000 claims abstract description 29
- 238000002360 preparation method Methods 0.000 claims abstract description 20
- 238000000926 separation method Methods 0.000 claims description 52
- 239000007789 gas Substances 0.000 claims description 47
- 239000007791 liquid phase Substances 0.000 claims description 21
- 239000012071 phase Substances 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 238000010926 purge Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 150000002431 hydrogen Chemical class 0.000 claims description 3
- 239000012808 vapor phase Substances 0.000 claims 1
- 238000007789 sealing Methods 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000005431 greenhouse gas Substances 0.000 description 2
- 230000009919 sequestration Effects 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention provides a system for generating electricity and preparing methanol by utilizing carbon dioxide energy storage, which comprises: the methanol preparation unit is configured to receive the externally input hydrogen and the carbon dioxide output by the energy storage power generation unit and prepare methanol. The energy storage power generation unit includes: the system comprises a first storage tank, a carbon dioxide compressor, a first heat exchanger and a carbon dioxide expander, wherein the first storage tank is configured to receive and store externally input carbon dioxide, the carbon dioxide compressor is configured to receive and compress the carbon dioxide from the first storage tank, the first heat exchanger is configured to receive the carbon dioxide from the carbon dioxide compressor and supply heat to the outside, and the carbon dioxide expander is configured to receive the carbon dioxide from the first heat exchanger and supply power to the outside. Therefore, renewable energy grid connection, power grid energy storage peak shaving and heat supply are realized, and meanwhile, the methanol yield can be increased.
Description
Technical Field
The invention relates to the technical field of carbon dioxide energy storage utilization, in particular to a system for generating power and preparing methanol by utilizing carbon dioxide energy storage.
Background
In order to realize global sustainable development, reducing greenhouse gas emissions is a consensus of the international society. Carbon dioxide is a world-recognized main source of greenhouse gases, which is a main cause of global warming, and in order to solve the problem of global warming caused by excessive carbon emission, carbon capture and sequestration technologies (carbon capture and storage, abbreviated CCS) are proposed in the european and american countries. CCS is a technology that captures CO 2 released into the atmosphere by a series of technological means, processes it, and then injects it into the formation for sequestration, thereby reducing CO 2 emissions. However, because the single trapping and sealing technology of the CCS is high in cost and cannot be applied on a large scale, and meanwhile, the project benefits of the CCS are not embodied in a specific reality, carbon trapping, utilizing and sealing technology (carbon capture utilization and storage, abbreviated as CCUS) is expanded on the basis of the CCS. Compared with CCS project, CCUS has more links of utilizing CO 2, and the CCUS project has the advantages of realizing the recycling utilization of CO 2 and bringing specific practical benefits.
However, with the development of technology, how to use the captured carbon dioxide has become a problem to be solved, and in view of the good physical properties of CO 2, it has become possible to use carbon dioxide instead of air as a medium for storing energy of compressed gas. However, in the prior art, the sealing mode of carbon dioxide is single, the sealing cost is higher, no equipment for realizing renewable energy grid connection and power grid energy storage peak regulation by means of energy storage power generation of carbon dioxide is provided, and meanwhile, the utilization rate of the sealed carbon dioxide is lower.
Disclosure of Invention
The invention provides a system for generating power and preparing methanol by utilizing carbon dioxide energy storage, which is used for solving the technical problem of lower utilization rate of carbon dioxide in the prior art, and achieving the purposes of renewable energy grid connection and grid energy storage peak shaving, improving the utilization rate of carbon dioxide, reducing industrial carbon emission, reducing carbon dioxide sealing pressure and increasing methanol yield.
The invention provides a system for generating electricity and preparing methanol by utilizing carbon dioxide energy storage, which comprises: the system comprises an energy storage power generation unit and a methanol preparation unit, wherein the energy storage power generation unit is configured to receive carbon dioxide input from the outside, supply heat to the outside and output electric energy, and the methanol preparation unit is configured to receive hydrogen input from the outside and carbon dioxide output by the energy storage power generation unit and prepare methanol;
Wherein, energy storage power generation unit includes: the system comprises a first storage tank, a carbon dioxide compressor, a first heat exchanger and a carbon dioxide expander, wherein the first storage tank is configured to receive and store externally input carbon dioxide, the carbon dioxide compressor is configured to receive and compress the carbon dioxide from the first storage tank, the first heat exchanger is configured to receive the carbon dioxide from the carbon dioxide compressor and supply heat to the outside, and the carbon dioxide expander is configured to receive the carbon dioxide from the first heat exchanger and supply power to the outside.
According to the system for generating electricity and preparing methanol by utilizing carbon dioxide energy storage provided by the invention, the energy storage power generation unit further comprises: the device comprises a first heat exchanger, a second heat exchanger, an evaporator and a second storage tank, wherein the first heat exchanger and the carbon dioxide expander are sequentially arranged between the first heat exchanger and the second heat exchanger, the second storage tank is configured to receive and store carbon dioxide from the first heat exchanger, the evaporator is configured to receive and gasify the carbon dioxide from the second storage tank, the second heat exchanger is configured to receive the carbon dioxide from the evaporator and externally cool the carbon dioxide, and the carbon dioxide of the second heat exchanger can be supplied to the carbon dioxide expander.
According to the present invention, there is provided a system for generating electricity and preparing methanol using carbon dioxide energy storage, the methanol preparation unit comprising: a hydrogen compressor, a methanol reactor, a high-pressure separation tank, a low-pressure separation tank and a methanol rectifying tower,
The hydrogen compressor is configured to receive and compress externally input hydrogen, the methanol reactor is configured to receive the hydrogen from the hydrogen compressor and the carbon dioxide from the energy storage power generation unit and generate mixed gas, the methanol reactor, the high-pressure separation tank, the low-pressure separation tank and the methanol rectifying tower are sequentially in fluid communication, and the mixed gas generated by the methanol reactor sequentially passes through the high-pressure separation tank and the low-pressure separation tank to be separated and then enters the methanol rectifying tower.
According to the system for generating electricity and preparing methanol by utilizing carbon dioxide energy storage provided by the invention, the methanol preparation unit further comprises: and a third heat exchanger, wherein the third heat exchanger is configured to receive and preheat the hydrogen from the hydrogen compressor and the carbon dioxide from the energy storage power generation unit, the third heat exchanger being capable of supplying the preheated hydrogen and carbon dioxide to the methanol reactor.
According to the system for generating electricity and preparing methanol by utilizing the carbon dioxide energy storage, the mixed gas generated by the methanol reactor can enter the third heat exchanger so as to preheat the hydrogen from the hydrogen compressor and the carbon dioxide from the second storage tank.
According to the system for generating electricity and preparing methanol by utilizing carbon dioxide energy storage provided by the invention, the methanol preparation unit further comprises: and a fourth heat exchanger disposed between the third heat exchanger and the high pressure separation tank, the fourth heat exchanger configured to receive and refrigerate the mixed gas from the third heat exchanger, and supply the refrigerated mixed gas to the high pressure separation tank.
According to the system for generating electricity and preparing methanol by utilizing carbon dioxide energy storage provided by the invention, the methanol preparation unit further comprises: and the pressure reducing valve is arranged between the high-pressure separation tank and the low-pressure separation tank, and is configured to reduce the pressure of liquid-phase products of the high-pressure separation tank and then convey the liquid-phase products to the low-pressure separation tank.
According to the system for generating electricity and preparing methanol by utilizing carbon dioxide energy storage, gas phase products generated by the high-pressure separation tank and the low-pressure separation tank at least partially flow back to the methanol reactor;
The gas phase products produced by the high pressure separator tank and the low pressure separator tank are at least partially discharged to the outside as purge gas.
According to the system for generating electricity and preparing methanol by utilizing carbon dioxide energy storage provided by the invention, the methanol preparation unit further comprises: a pressure pump and a fifth heat exchanger, which are sequentially disposed between the low pressure separation tank and the methanol rectifying column, the pressure pump configured to receive the liquid phase product from the low pressure separation tank, and the fifth heat exchanger configured to receive and preheat the liquid phase product from the pressure pump and supply the preheated liquid phase product to the methanol rectifying column.
According to the system for generating electricity and preparing methanol by utilizing carbon dioxide energy storage, the carbon dioxide expander is configured to supply power to the hydrogen compressor.
The system for generating power and preparing methanol by utilizing the carbon dioxide energy storage can store captured carbon dioxide, then store electric energy in the form of carbon dioxide internal energy by inputting wind-solar energy power-off or industrial low-valley power, then release the carbon dioxide internal energy and generate power when electricity is used in a peak, realize renewable energy grid connection and power grid energy storage peak regulation, and simultaneously realize external heat supply along with heat output when the system operates. And the carbon dioxide received in the system can be used for preparing the methanol together with the hydrogen conveyed by the outside, so that the sealing pressure of the carbon dioxide can be reduced, the utilization rate of the carbon dioxide can be improved, and the yield of the methanol can be increased.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a system for generating electricity and producing methanol using carbon dioxide energy storage in accordance with one embodiment of the present invention.
Reference numerals:
10. An energy storage power generation unit; 11. a first storage tank; 12. a carbon dioxide compressor; 13. a first heat exchanger; 14. a second storage tank; 15. an evaporator; 16. a second heat exchanger; 17. a carbon dioxide expander; 20. a methanol preparation unit; 21. a hydrogen compressor; 22. a methanol reactor; 23. a third heat exchanger; 24. a fourth heat exchanger; 25. a high pressure separator tank; 26. a low pressure separator tank; 27. a pressure pump; 28. a fifth heat exchanger; 29. and (3) a methanol rectifying tower.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In one embodiment according to the invention, a system for generating electricity and producing methanol using carbon dioxide energy storage is provided, in which the captured carbon dioxide can be stored, electric energy can be stored in the form of carbon dioxide internal energy by inputting wind-solar energy power-off or industrial off-peak electricity, then the carbon dioxide internal energy is released and power generation is performed at the time of electricity utilization peak, renewable energy grid connection and grid energy storage peak regulation are realized, and meanwhile, external heat supply can be realized along with heat output during system operation. The system for generating electricity and producing methanol using carbon dioxide energy storage according to the present invention is described below with reference to fig. 1.
As shown in fig. 1, in the present embodiment, a system for generating electricity and producing methanol using carbon dioxide energy storage includes: an energy storage power generation unit 10 and a methanol preparation unit 20. Wherein the energy storage power generation unit 10 is configured to receive carbon dioxide inputted from the outside and supply and output electric energy to the outside, and the methanol preparation unit 20 is configured to receive hydrogen inputted from the outside and carbon dioxide outputted from the energy storage power generation unit 10 and prepare methanol.
Specifically, as shown in fig. 1, the energy storage power generation unit 10 includes: the carbon dioxide storage device comprises a first storage tank 11, a carbon dioxide compressor 12, a first heat exchanger 13 and a carbon dioxide expander 17, wherein the first storage tank 11 is configured to receive and store externally input carbon dioxide, the carbon dioxide compressor 12 is configured to receive and compress the carbon dioxide from the first storage tank 11, the first heat exchanger 13 is configured to receive the carbon dioxide from the carbon dioxide compressor 12 and supply heat to the outside, and the carbon dioxide expander 17 is configured to receive the carbon dioxide from the first heat exchanger 13 and supply power to the outside.
In actual use, the carbon dioxide captured by the external device can be temporarily stored in the first storage tank 11, and the carbon dioxide compressor 12 compresses the carbon dioxide from the first storage tank 11 by inputting wind-solar energy, off-peak industrial energy, or the like to the system, and these electric energy are stored as carbon dioxide energy. The compressed carbon dioxide can output heat to the outside in the first heat exchanger 13 or can also store heat by means of a heat storage medium. And then, in the electricity consumption peak period, releasing carbon dioxide to enter the carbon dioxide expander 17, so that the carbon dioxide expander 17 generates electricity and supplies power to the outside to realize renewable energy grid connection and grid energy storage peak regulation.
Meanwhile, the methanol preparation unit 20 is capable of receiving externally input hydrogen and carbon dioxide output from the first heat exchanger 13 in the energy storage power generation unit 10, and preparing methanol. Therefore, the sealing pressure of the carbon dioxide can be reduced, the utilization rate of the carbon dioxide can be improved, and the yield of the methanol can be increased.
Further, as shown in fig. 1, the energy storage power generation unit 10 further includes: a second storage tank 14, an evaporator 15 and a second heat exchanger 16. The second storage tank 14, the evaporator 15 and the second heat exchanger 16 are disposed in this order between the first heat exchanger 13 and the carbon dioxide expander 17, wherein the second storage tank 14 is configured to receive and store carbon dioxide from the first heat exchanger 13, the evaporator 15 is configured to receive and gasify carbon dioxide from the second storage tank 14, the second heat exchanger 16 is configured to receive carbon dioxide from the evaporator 15 and cool the outside, and the carbon dioxide of the second heat exchanger 16 can be supplied to the carbon dioxide expander 17.
In the present embodiment, the carbon dioxide is in a liquid state after passing through the carbon dioxide compressor 12 and the first heat exchanger 13, and the second storage tank 14 can store the carbon dioxide in a liquid state. Then, the second storage tank 14 supplies the carbon dioxide in a liquid state to the evaporator 15 to vaporize it.
The carbon dioxide gasified by the evaporator 15 enters the second heat exchanger 16, and the carbon dioxide can absorb a large amount of heat in the second heat exchanger 16, thereby externally cooling. After that, the carbon dioxide cooled to the outside in the second heat exchanger 16 enters the carbon dioxide expander 17, and the carbon dioxide expander 17 generates power based on the received carbon dioxide and supplies power to the outside.
The second storage tank 14 is illustratively a low-pressure liquid storage tank, which can reduce the storage capacity requirement, can effectively reduce the container cost, reduces the occupied area, and can improve the storage flexibility without being limited by regions.
In an alternative embodiment, the carbon dioxide stored in the second storage tank 14 in a liquid state may be directly supplied to the methanol preparation unit 20 so as to prepare methanol.
In the present embodiment, as shown in fig. 1, the methanol preparation unit 20 includes: a hydrogen compressor 21, a methanol reactor 22, a high pressure separator tank 25, a low pressure separator tank 26, and a methanol rectifying column 29.
Specifically, the hydrogen compressor 21 is configured to receive and compress externally input hydrogen, the methanol reactor 22 is configured to receive the hydrogen from the hydrogen compressor 21 and the carbon dioxide from the energy storage power generation unit 10 and generate a mixed gas, the methanol reactor 22, the high pressure separation tank 25, the low pressure separation tank 26 and the methanol rectifying tower 29 are sequentially in fluid communication, and the mixed gas generated by the methanol reactor 22 is sequentially separated by the high pressure separation tank 25 and the low pressure separation tank 26 and then enters the methanol rectifying tower 29.
In actual use, the hydrogen input by the external device can enter the hydrogen compressor 21, then the hydrogen compressed by the hydrogen compressor 21 and the carbon dioxide provided by the energy storage power generation unit 10 can enter the methanol reactor 22 at the same time, the methanol reactor 22 generates a mixed gas containing methanol, and the mixed gas is separated by the high-pressure separation tank 25 and the low-pressure separation tank 26 in sequence and then enters the methanol rectifying tower 29 so as to prepare the methanol.
As shown in fig. 1, the methanol preparation unit 20 further includes: the third heat exchanger 23. Wherein the third heat exchanger 23 is configured to receive and preheat the hydrogen from the hydrogen compressor 21 and the carbon dioxide from the energy storage power generation unit 10, the third heat exchanger 23 being capable of supplying the preheated hydrogen and carbon dioxide to the methanol reactor 22.
That is, the carbon dioxide and hydrogen may be primarily preheated in the third heat exchanger 23 before entering the methanol reactor 22.
Further, the mixed gas generated after the reaction in the methanol reactor 22 has a high temperature, and in order to effectively use the heat of the mixed gas, in the present embodiment, the mixed gas generated in the methanol reactor 22 can enter the third heat exchanger 23 to preheat the hydrogen from the hydrogen compressor 21 and the carbon dioxide from the energy storage power generation unit 10.
In an alternative embodiment, the carbon dioxide is fed as feed to the first storage tank 11 at a pressure of 1bar and a temperature of 25 ℃, after which the carbon dioxide is pressurized to 50bar in the carbon dioxide compressor 12. The pressure at which hydrogen as feed enters the hydrogen compressor 21 is 1bar and the temperature is 25 c, after which the hydrogen is pressurized to 50bar in the hydrogen compressor 21. The mixed gas generated through the methanol reactor 22 in the third heat exchanger 23, which is pressurized to 50bar, is preheated to 250 c and then is introduced into the methanol reactor 22.
Alternatively, in the methanol reactor 22, cu, zn, al, zr, or the like may be used as a catalyst for synthesizing methanol by hydrogenating carbon dioxide.
Because of the low single pass conversion in the methanol reactor 22, the mixed gas produced by the methanol reactor 22 contains a large amount of unreacted CO 2, CO and H 2 in addition to methanol. Moreover, even after the heat is output through the third heat exchanger 23, the mixed gas generated in the methanol reactor 22 still has a relatively high temperature, and the mixed gas needs to be further cooled before entering the high-pressure separation tank 25.
In contrast, in the present embodiment, as shown in fig. 1, the methanol production unit 20 further includes: fourth heat exchanger 24. The fourth heat exchanger 24 is disposed between the third heat exchanger 23 and the high-pressure separation tank 25, and the fourth heat exchanger 24 is configured to receive and refrigerate the mixed gas from the third heat exchanger 23 and supply the refrigerated mixed gas to the high-pressure separation tank 25.
The mixed gas from the third heat exchanger 23 can be cooled to within 30 c by the fourth heat exchanger 24 and then fed to the high pressure separator tank 25, for example. The fourth heat exchanger 24 may be a condenser.
In an alternative embodiment, the methanol preparation unit 20 further includes: a pressure reducing valve, wherein the pressure reducing valve is provided between the high pressure separation tank 25 and the low pressure separation tank 26, the pressure reducing valve being configured to depressurize the liquid phase product of the high pressure separation tank 25 and then to deliver to the low pressure separation tank 26.
Illustratively, a pressure relief valve may depressurize the liquid phase product of the high pressure knockout drum 25 to 1.2bar before it is sent to the low pressure knockout drum 26.
The gas phase product after separation via the high pressure separator tank 25 and the low pressure separator tank 26 still contains a large amount of unreacted CO 2, CO and H 2, and in order to further improve the utilization of the raw materials, the gas phase product produced by the high pressure separator tank 25 and the low pressure separator tank 26 is at least partially refluxed to the methanol reactor 22. Meanwhile, in order to improve the production efficiency of methanol, the gas phase products generated in the high pressure separation tank 25 and the low pressure separation tank 26 are at least partially discharged to the outside as purge gas.
It will be appreciated that in this embodiment, the mixed gas cooled to within 30 ℃ is separated into two phases in the high pressure separator tank 25, wherein the gas phase product is discharged from the high pressure separator tank 25 and the liquid phase product flows out from the bottom of the high pressure separator tank 25. The liquid phase product is depressurized to 1.2bar via a depressurization valve and then is fed to the low-pressure separation tank 26, the liquid phase product entering the low-pressure separation tank 26 is separated into two phases again, wherein the gas phase product is discharged from the low-pressure separation tank 26, and the liquid phase product flows out from the bottom of the low-pressure separation tank 26 and finally enters the methanol rectifying column 29.
After that, the gas phase product separated in the low pressure separator tank 26 and the gas phase product separated in the high pressure separator tank 25 are combined into one stream, and a large part of the gas phase product is circulated and returned to the methanol reactor 22, and a small part is discharged to the outside as purge gas.
Illustratively, to reduce the loss of the effective components, the discharge location of the purge gas is selected to be the location of greatest inert gas concentration in the mixed gas phase product.
In an alternative embodiment, for the mixed gas phase product, 0.75% of the recycle gas may be selected for purge gas discharge, with the remaining 99.25% of the recycle gas being returned to the methanol reactor 22.
As shown in fig. 1, the methanol preparation unit 20 further includes: a pressure pump 27 and a fifth heat exchanger 28, the pressure pump 27 and the fifth heat exchanger 28 being disposed in this order between the low pressure separation tank 26 and the methanol rectifying column 29, the pressure pump 27 being configured to receive the liquid-phase product from the low pressure separation tank 26, the fifth heat exchanger 28 being configured to receive and preheat the liquid-phase product from the pressure pump 27, and to supply the preheated liquid-phase product to the methanol rectifying column 29.
In this embodiment, the liquid-phase product separated in the low-pressure separator tank 26 is rich in methanol, and the liquid-phase product enters the fifth heat exchanger 28 by being driven by the pressure pump 27, and enters the methanol rectifying tower 29 after being preheated to the bubble point temperature.
In the present embodiment, the hydrogen compressor 21 may be supplied with power by the carbon dioxide expander 17, in addition to being supplied with power by an external device. That is, the electric power generated by the carbon dioxide expander 17 may be directly supplied to the hydrogen compressor 21, or may be temporarily stored in an energy storage device and supplied to the hydrogen compressor 21 from the energy storage device.
As can be seen, the system for generating electricity and preparing methanol using carbon dioxide energy storage in the present embodiment has the following advantages:
The system in the embodiment can realize carbon dioxide storage, energy storage and power generation, and can be used for preparing methanol by hydrogenating carbon dioxide, so that the system can be independently realized, can also be operated in a combined mode, can realize the mutual conversion among the systems according to actual conditions in the actual operation of the system, and meets the actual requirements. Meanwhile, the high-concentration carbon dioxide after the capturing and purifying can be led out from the pipeline for other industrial fields.
Meanwhile, the system in the embodiment solves the defect of single sealing and storing of the traditional carbon dioxide, effectively utilizes sealing and storing carbon dioxide by energy storage power generation and methanol preparation by carbon dioxide hydrogenation, improves the economy of carbon dioxide treatment, reduces the carbon sealing and storing cost, and has good development prospect.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A system for generating electricity and producing methanol from carbon dioxide energy comprising: the system comprises an energy storage power generation unit and a methanol preparation unit, wherein the energy storage power generation unit is configured to receive carbon dioxide input from the outside, supply heat to the outside and output electric energy, and the methanol preparation unit is configured to receive hydrogen input from the outside and carbon dioxide output by the energy storage power generation unit and prepare methanol;
Wherein, energy storage power generation unit includes: the system comprises a first storage tank, a carbon dioxide compressor, a first heat exchanger and a carbon dioxide expander, wherein the first storage tank is configured to receive and store externally input carbon dioxide, the carbon dioxide compressor is configured to receive and compress the carbon dioxide from the first storage tank, the first heat exchanger is configured to receive the carbon dioxide from the carbon dioxide compressor and supply heat to the outside, and the carbon dioxide expander is configured to receive the carbon dioxide from the first heat exchanger and supply power to the outside.
2. The system for power generation and methanol production using carbon dioxide energy storage of claim 1 wherein the energy storage power generation unit further comprises: the device comprises a first heat exchanger, a second heat exchanger, an evaporator and a second storage tank, wherein the first heat exchanger and the carbon dioxide expander are sequentially arranged between the first heat exchanger and the second heat exchanger, the second storage tank is configured to receive and store carbon dioxide from the first heat exchanger, the evaporator is configured to receive and gasify the carbon dioxide from the second storage tank, the second heat exchanger is configured to receive the carbon dioxide from the evaporator and externally cool the carbon dioxide, and the carbon dioxide of the second heat exchanger can be supplied to the carbon dioxide expander.
3. The system for generating electricity and producing methanol using carbon dioxide energy storage according to claim 1, wherein the methanol production unit comprises: a hydrogen compressor, a methanol reactor, a high-pressure separation tank, a low-pressure separation tank and a methanol rectifying tower,
The hydrogen compressor is configured to receive and compress externally input hydrogen, the methanol reactor is configured to receive the hydrogen from the hydrogen compressor and the carbon dioxide from the energy storage power generation unit and generate mixed gas, the methanol reactor, the high-pressure separation tank, the low-pressure separation tank and the methanol rectifying tower are sequentially in fluid communication, and the mixed gas generated by the methanol reactor sequentially passes through the high-pressure separation tank and the low-pressure separation tank to be separated and then enters the methanol rectifying tower.
4. The system for generating electricity and producing methanol using carbon dioxide energy storage as in claim 3, wherein the methanol production unit further comprises: and a third heat exchanger, wherein the third heat exchanger is configured to receive and preheat the hydrogen from the hydrogen compressor and the carbon dioxide from the energy storage power generation unit, the third heat exchanger being capable of supplying the preheated hydrogen and carbon dioxide to the methanol reactor.
5. The system for power generation and methanol production using carbon dioxide storage as in claim 4 wherein the mixed gas produced by the methanol reactor is able to enter the third heat exchanger to preheat hydrogen from the hydrogen compressor and carbon dioxide from the energy storage power generation unit.
6. The system for generating electricity and producing methanol using carbon dioxide energy storage of claim 5 wherein said methanol production unit further comprises: and a fourth heat exchanger disposed between the third heat exchanger and the high pressure separation tank, the fourth heat exchanger configured to receive and refrigerate the mixed gas from the third heat exchanger, and supply the refrigerated mixed gas to the high pressure separation tank.
7. The system for generating electricity and producing methanol using carbon dioxide energy storage as in claim 3, wherein the methanol production unit further comprises: and the pressure reducing valve is arranged between the high-pressure separation tank and the low-pressure separation tank, and is configured to reduce the pressure of liquid-phase products of the high-pressure separation tank and then convey the liquid-phase products to the low-pressure separation tank.
8. A system for generating electricity and producing methanol from carbon dioxide storage as in claim 3 wherein the vapor phase product produced by the high pressure separator tank and the low pressure separator tank is at least partially refluxed to the methanol reactor;
The gas phase products produced by the high pressure separator tank and the low pressure separator tank are at least partially discharged to the outside as purge gas.
9. The system for generating electricity and producing methanol using carbon dioxide energy storage as in claim 3, wherein the methanol production unit further comprises: a pressure pump and a fifth heat exchanger, which are sequentially disposed between the low pressure separation tank and the methanol rectifying column, the pressure pump configured to receive the liquid phase product from the low pressure separation tank, and the fifth heat exchanger configured to receive and preheat the liquid phase product from the pressure pump and supply the preheated liquid phase product to the methanol rectifying column.
10. The system for generating electricity and producing methanol from carbon dioxide energy storage of claim 3 wherein said carbon dioxide expander is configured to power said hydrogen compressor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211262185.4A CN117924027A (en) | 2022-10-14 | 2022-10-14 | System for generating power and preparing methanol by utilizing carbon dioxide energy storage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211262185.4A CN117924027A (en) | 2022-10-14 | 2022-10-14 | System for generating power and preparing methanol by utilizing carbon dioxide energy storage |
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