阅读说明：本技术 一种基于煤制甲醇的风能储能系统及方法 (Wind energy storage system and method based on coal-to-methanol ) 是由 张纯 吴家荣 白文刚 张一帆 李红智 姚明宇 于 2021-10-18 设计创作，主要内容包括：本发明公开了一种基于煤制甲醇的风能储能系统及方法,包括电解分系统和煤制甲醇分系统；电解分系统包括风车、电解槽、氧气储罐和氢气储罐；煤制甲醇分系统包括气化炉、洗涤冷却器、脱碳塔、反应器、分离装置和甲醇储槽。该系统在具体工作时,将风能产生的电能通过电解转化为氢气的化学能,并进一步通过合成甲醇反应,将能量储存在甲醇中,能量密度高、可以长期储存、用途广泛,从而实现将风能进行有效的储存。合成甲醇时,合成气中缺少的氢气通过电解水获得,免去了水煤气变换反应,节省了水的使用,减少了二氧化碳的排放。(The invention discloses a wind energy storage system and a method based on coal-based methanol, comprising an electrolysis subsystem and a coal-based methanol subsystem; the electrolysis subsystem comprises a windmill, an electrolytic cell, an oxygen storage tank and a hydrogen storage tank; the coal-to-methanol subsystem comprises a gasification furnace, a washing cooler, a decarbonization tower, a reactor, a separation device and a methanol storage tank. When the system works specifically, electric energy generated by wind energy is converted into chemical energy of hydrogen through electrolysis, and further through a methanol synthesis reaction, the energy is stored in methanol, so that the energy density is high, the long-term storage can be realized, the application is wide, and the wind energy can be effectively stored. When the methanol is synthesized, hydrogen which is lacked in the synthesis gas is obtained by electrolyzing water, thereby avoiding water gas shift reaction, saving the use of water and reducing the emission of carbon dioxide.)

1. A wind energy storage system based on coal-based methanol production is characterized by comprising an electrolysis subsystem and a coal-based methanol production subsystem;

the electrolysis subsystem comprises a windmill (1), an electrolytic cell (2), an oxygen storage tank (3) and a hydrogen storage tank (10), electric power generated by the windmill (1) is transmitted to the electrolytic cell (2), and an outlet of the electrolytic cell (2) is respectively communicated with inlets of the oxygen storage tank (3) and the hydrogen storage tank (10);

the coal-to-methanol subsystem comprises a gasification furnace (4), a washing cooler (5), a decarbonization tower (6), a reactor (7), a separation device (8) and a methanol storage tank (9); the gas outlet of the gasification furnace (4) is communicated with the inlet of the washing cooler (5), the outlet of the washing cooler (5) is communicated with the inlet of the decarbonization tower (6), the outlet of the decarbonization tower (6) is communicated with the inlet of the reactor (7), the outlet of the reactor (7) is communicated with the inlet of the separation device (8), and the outlet of the separation device (8) is respectively communicated with the inlet of the reactor (7), the inlet of the electrolytic bath (2) and the inlet of the methanol storage tank (9).

2. The coal-based wind energy storage system for methanol production according to claim 1, wherein the reactor (7) is a shell-and-tube reactor or a slurry bed reactor, and the reactor (7) is loaded with a methanol synthesis catalyst.

3. The wind energy storage system based on coal-based methanol preparation according to claim 1, characterized in that the gasification furnace (4) is a lurgi gasification furnace, and the gasification process is a pure oxygen and steam continuous atmospheric gasification process.

4. The coal-based methanol-to-wind energy storage system according to claim 1, wherein the decarbonization tower (6) is a low temperature methanol wash.

5. The wind energy storage system based on coal-based methanol production as claimed in claim 1, wherein after the gas-liquid separation by the separation device (8), a rectifying tower process is selected to separate the methanol and the water.

6. The coal-based wind energy storage system for methanol production according to claim 1, wherein the bottom of the gasification furnace (4) is provided with an ash discharge port, and the bottom of the scrubbing cooler 5 is provided with a discharge port.

7. The operation method of the coal-based methanol-to-methanol wind energy storage system based on any one of claims 1 to 6 is characterized by comprising the following steps;

electric power generated by a windmill (1) enters an electrolytic tank (2), oxygen generated after water electrolysis in the electrolytic tank (2) enters an oxygen storage tank (3), hydrogen enters a hydrogen storage tank (10), oxygen in the oxygen storage tank (3) is sent into a gasification furnace (4), coal reacts with water vapor and oxygen in the gasification furnace (4) to generate synthetic gas and ash, the ash is discharged from the bottom of the gasification furnace (4), the synthetic gas enters a washing cooler (5), is washed and cooled and then enters a decarbonization tower (6), black water containing partial residual carbon is discharged from the bottom of the washing cooler (5), carbon dioxide in the synthetic gas is removed in the decarbonization tower (6), the synthetic gas after carbon dioxide removal enters a reactor (7), hydrogen in the hydrogen storage tank (10) is also sent into the reactor (7) and is mixed according to a certain proportion to carry out methanol synthesis reaction in the reactor (7), the product after reaction enters a separation device (8), unreacted gas after separation returns to a reactor (7), the generated methanol enters a methanol storage tank (9), and water generated by side reaction is supplemented into an electrolytic cell (2).

8. The operation method of the wind energy storage system based on the coal-based methanol production as claimed in claim 7 is characterized in that when the wind energy is sufficient, the windmill (1) continuously generates electricity, the electrolysis capacity of the electrolysis bath (2) is larger than the capacity of the reactor (7) for processing hydrogen, and part of the surplus hydrogen is stored in the hydrogen storage tank (3);

when wind energy is insufficient, the capacity of the electrolytic bath (2) for generating hydrogen by electrolysis is smaller than the capacity of the reactor (7) for processing hydrogen, and the normal operation of the reactor (7) is maintained by utilizing the excessive hydrogen stored in the hydrogen storage tank (3).

9. The method for operating a coal-based methanol-to-wind energy storage system according to claim 7, wherein the volume ratio of carbon monoxide to hydrogen in the reactor (7) is 1: 2.

Technical Field

The invention belongs to the technical field of wind energy storage, and particularly relates to a wind energy storage system and method based on coal-based methanol preparation.

Background

Chemical energy storage is based on chemical reactions, which achieve the storage of energy by the breaking recombination of chemical bonds of reactants and products. After the energy storage substance is generated through the chemical reaction, particularly the liquid energy storage substance has the characteristics of high energy density and long-term storage, and is suitable for storing after the wind energy is converted. The synthetic methanol is a chemical energy storage mode and has the characteristics of high energy storage density, long-term storage, wide product application and the like.

In northwest areas of China, wind energy resources are rich, but in order to stably utilize wind energy, a thermal power generating unit and the like need to be subjected to peak shaving or battery energy storage, and in northwest areas, coal resources are rich, and the coal-to-methanol industry is mature, so that if a chemical energy storage system can be developed and utilized, the system can convert the wind energy into chemical energy to be stored in energy storage substances, and great change can be brought to the utilization of the wind energy.

The existing wind energy storage energy has low energy density and can not be stored for a long time.

Disclosure of Invention

In order to overcome the technical problems, the invention provides a wind energy storage system and a method based on methanol prepared from coal, which convert wind energy into an energy storage substance methanol for storage, have high energy density, long-term storage and wide application.

In order to achieve the purpose, the invention adopts the technical scheme that:

a wind energy storage system based on coal-based methanol production comprises an electrolysis subsystem and a coal-based methanol production subsystem;

the electrolysis subsystem comprises a windmill 1, an electrolytic cell 2, an oxygen storage tank 3 and a hydrogen storage tank 10, wherein electric power generated by the windmill 1 is transmitted to the electrolytic cell 2, and the outlet of the electrolytic cell 2 is respectively communicated with the inlets of the oxygen storage tank 3 and the hydrogen storage tank 10;

the coal-to-methanol subsystem comprises a gasification furnace 4, a washing cooler 5, a decarbonization tower 6, a reactor 7, a separation device 8 and a methanol storage tank 9; the gas outlet of the gasification furnace 4 is communicated with the inlet of the washing cooler 5, the outlet of the washing cooler 5 is communicated with the inlet of the decarbonization tower 6, the outlet of the decarbonization tower 6 is communicated with the inlet of the reactor 7, the outlet of the reactor 7 is communicated with the inlet of the separation device 8, and the outlet of the separation device 8 is respectively communicated with the inlet of the reactor 7, the inlet of the electrolytic bath 2 and the inlet of the methanol storage tank 9.

The reactor 7 is a shell-and-tube reactor or a slurry bed reactor, and the reactor 7 is loaded with a methanol synthesis catalyst.

The gasification furnace 4 is a Lurgi gasification furnace, and the gasification process is a pure oxygen and steam continuous normal-pressure gasification process.

The decarbonizing tower 6 is low-temperature methanol washing.

And after the gas-liquid separation is carried out by the separation device 8, the methanol and the water are separated by a rectifying tower process.

An ash residue discharge port is arranged at the bottom of the gasification furnace 4, and a discharge port is arranged at the bottom of the washing cooler 5.

An operation method of a wind energy storage system based on methanol prepared from coal comprises the following steps;

the electric power generated by the windmill 1 enters the electrolytic tank 2, the oxygen generated after the water electrolysis in the electrolytic tank 2 enters the oxygen storage tank 3, the hydrogen enters the hydrogen storage tank 10, the oxygen in the oxygen storage tank 3 is sent into the gasification furnace 4, in the gasification furnace 4, coal reacts with water vapor and oxygen to generate synthetic gas and ash slag, the ash slag is discharged from the bottom of the gasification furnace 4, the synthetic gas enters the washing cooler 5, after washing and cooling, the synthetic gas enters the decarbonization tower 6, black water containing partial carbon residue is discharged from the bottom of the washing cooler 5, carbon dioxide in the synthetic gas is removed in the decarbonization tower 6, the synthetic gas after carbon dioxide removal enters the reactor 7, the hydrogen in the hydrogen storage tank 10 is also sent into the reactor 7, after mixing according to a certain proportion, the synthetic methanol reaction is carried out in the reactor 7 together, the product after the reaction enters the separation device 8, the unreacted gas after the separation returns to the reactor 7, the generated methanol enters a methanol storage tank 9, and water generated by side reaction is supplemented into the electrolytic bath 2.

When the wind energy is sufficient, the windmill 1 continuously generates electricity, the capacity of the electrolytic bath 2 for generating hydrogen through electrolysis is larger than the capacity of the reactor 7 for processing hydrogen, and part of surplus hydrogen is stored in the hydrogen storage tank 3;

when the wind energy is insufficient, the capacity of the electrolytic bath 2 for generating hydrogen by electrolysis is smaller than the capacity of the reactor 7 for processing hydrogen, and the normal operation of the reactor 7 is maintained by using the excessive hydrogen stored in the hydrogen storage tank 3.

The volume ratio of carbon monoxide to hydrogen in the reactor 7 is 1: 2.

The invention has the beneficial effects that:

when the wind energy storage system based on the coal-based methanol works specifically, electric energy generated by wind energy is converted into chemical energy of hydrogen through electrolysis, and further through methanol synthesis reaction, the energy is stored in the methanol, the energy density is high, the energy can be stored for a long time, and the application is wide, so that the wind energy can be effectively stored, and oxygen generated through electrolysis can also be used for gasification reaction of coal. When the methanol is synthesized, hydrogen which is lacked in the synthesis gas is obtained by electrolyzing water, thereby avoiding water gas shift reaction, saving the use of water and reducing the emission of carbon dioxide.

Drawings

FIG. 1 is a schematic diagram of the system of the present invention.

Wherein 1 is a windmill, 2 is an electrolytic bath, 3 is an oxygen storage tank, 4 is a gasification furnace, 5 is a washing cooler, 6 is a decarbonization tower, 7 is a reactor, 8 is a separation device, 9 is a methanol storage tank, and 10 is a hydrogen storage tank.

Detailed Description

The present invention will be described in further detail with reference to examples.

Referring to fig. 1, the wind energy storage system based on coal-based methanol of the present invention includes an electrolysis subsystem and a coal-based methanol subsystem; the electrolysis subsystem comprises a windmill 1, an electrolytic cell 2, an oxygen storage tank 3 and a hydrogen storage tank 10; a coal-to-methanol subsystem comprises a gasification furnace 4, a washing cooler 5, a decarbonization tower 6, a reactor 7, a separation device 8 and a methanol storage tank 9.

The electric power generated by the windmill 1 is transmitted to the electrolytic cell 2, and the outlet of the electrolytic cell 2 is respectively communicated with the inlets of the oxygen storage tank 3 and the hydrogen storage tank 10.

The gas outlet of the gasification furnace 4 is communicated with the inlet of the washing cooler 5, the outlet of the washing cooler 5 is communicated with the inlet of the decarbonization tower 6, the outlet of the decarbonization tower 6 is communicated with the inlet of the reactor 7, the outlet of the reactor 7 is communicated with the inlet of the separation device 8, and the outlet of the separation device 8 is respectively communicated with the inlet of the reactor 7, the inlet of the electrolytic bath 2 and the inlet of the methanol storage tank 9.

Preferably, the gasification furnace 4 is in the form of a lurgi gasification furnace, and the gasification process is a pure oxygen and steam continuous normal-pressure gasification process.

Preferably, the process used in the decarbonation column 6 is a low temperature methanol wash.

Preferably, the reactor 7 is in the form of a shell-and-tube reactor, the tube side of which is loaded with a synthetic methanol catalyst.

Preferably, after the gas-liquid separation is performed by the separation device 8, the methanol and the water are separated by a rectifying tower process.

The power generated by the windmill 1 enters the electrolytic cell 2, the oxygen generated by the electrolysis of water in the electrolytic cell 2 enters the oxygen storage tank 3, and the hydrogen enters the hydrogen storage tank 10. 1 cubic meter of hydrogen is generated by electrolysis, the power consumption is about 5 kilowatt hours, the installed capacity of a wind field is 50MW, the yield of hydrogen is 10000 cubic meters per hour and the yield of oxygen is 5000 cubic meters per hour under the rated working condition.

Oxygen in the oxygen storage tank 3 is sent into the gasification furnace 1, coal reacts with steam and oxygen in the gasification furnace 1 to generate synthetic gas and ash, the ash is discharged from the bottom of the gasification furnace 1, the synthetic gas enters the washing cooler 5, enters the decarbonization tower 6 after being washed and cooled, black water containing partial residual carbon is discharged from the bottom of the washing cooler 5, carbon dioxide in the synthetic gas is removed in the decarbonization tower 6, and the synthetic gas after carbon dioxide removal enters the reactor 7. Two lurgi gasification furnaces with the diameter of 3000 millimeters can achieve the treatment capacity of 35 tons of coal per hour, the selected coal is bituminous coal, the gas production rate is about 1.45 cubic meters per kilogram of coal, after impurities such as carbon dioxide, hydrogen sulfide and the like are removed from the synthesis gas generated after gasification, the yield of the synthesis gas is about 45000 cubic meters per hour, the ratio of carbon monoxide to hydrogen in the synthesis gas is about 4:6, namely the yield of the carbon monoxide is 18000 cubic meters per hour, and the yield of the hydrogen is 27000 cubic meters per hour.

Hydrogen in a hydrogen storage tank 10 is also fed into the reactor 7, the amount of supplemented hydrogen is 9000 cubic meters per hour, the volume ratio of carbon monoxide to hydrogen is adjusted to be 1:2, the carbon monoxide and the hydrogen are subjected to methanol synthesis reaction in the reactor 7, the product after the reaction enters a separation device 8, the unreacted gas after the separation returns to the reactor 7, the generated methanol enters a methanol storage tank 9, and the water generated by the side reaction is supplemented into the electrolytic cell 2.

When the wind energy is sufficient, the windmill 1 continuously generates electricity, the capacity of the electrolytic bath 2 for generating hydrogen by electrolysis is 10000 cubic meters per hour, which is more than 9000 cubic meters per hour of the capacity of the reactor 7 for supplementing hydrogen, and part of surplus hydrogen is stored in the hydrogen storage tank 3.

When the wind energy is insufficient, the capacity of the electrolytic bath 2 for generating hydrogen by electrolysis is smaller than the capacity of the reactor 7 for processing hydrogen, and the normal operation of the reactor 7 can be maintained by utilizing the excessive hydrogen stored in the hydrogen storage tank 3.

It should be noted that the above-mentioned embodiments are only for illustrating the technical idea and features of the present invention, and the specific implementation methods, such as the furnace type and gasification process of the gasification furnace 1, the decarburization process of the decarburization tower 6, the form of the reactor 7, the form and process of the separation device 8, and the like, can be modified and improved without departing from the scope and essential spirit of the present invention as defined in the claims.