Green electricity coupling coal salt comprehensive utilization method

Abstract

The invention discloses a green electricity coupling coal salt comprehensive utilization method. Conveying the pulverized coal to a gasification furnace for gasification to obtain crude synthesis gas; conveying the crude synthesis gas to a washing device to obtain first synthesis gas; refining the crude salt to obtain a refined salt saturated aqueous solution, electrolyzing the refined salt saturated aqueous solution, and purifying to prepare H2; oxidizing part of H2 to obtain hydrogen peroxide; the first synthesis gas enters a conversion process, so that part of CO is converted into H2, mixed gas is obtained, the mixed gas is conveyed to a purification device, and second synthesis gas is obtained; mixing a part of H2 with the second synthesis gas to adjust the ratio of carbon to hydrogen so as to obtain methanol; respectively synthesizing a part of methanol and CO in the second synthesis gas to obtain ethanol and acetic acid; conveying part of methanol to an olefin synthesis device to obtain ethylene and propylene; synthesizing acetic acid and ethylene to obtain vinyl acetate; and polymerizing vinyl acetate and ethylene to obtain EVA.

Description

Technical Field

[0001] The present application relates to the technical field of coal chemical industry and salt chemical industry, and in particular to a method for comprehensive utilization of green electricity coupled with coal and salt. Background Art

[0003] my country's primary energy source is mainly coal. However, my country's salt resources are very rich, and its raw salt production and consumption are among the highest in the world. Most of it is used in industrial production, mainly in the two major industries of soda ash and chlor-alkali. Both the "two alkali" industries have problems such as less downstream product development and low product added value.

[0004] Although the existing technology also makes comprehensive use of coal chemical industry and salt chemical industry, it is limited to the preparation of caustic soda, polyvinyl chloride and other products, and does not fully and comprehensively utilize the two resources, thus reducing the value of comprehensive utilization of resources.

[0005] At present, the country is vigorously promoting the development of new energy industries. How to couple the development of new energy with coal chemical industry and salt chemical industry is the key to solving industrial integration. It is also conducive to improving energy utilization efficiency, building a new industrial system, and realizing the diversification, high-end and low-carbon development of products. Summary of the invention

[0006] The embodiments of the present application solve the problem of comprehensive utilization and integrated development of new energy, coal chemical industry and salt chemical industry in the prior art by providing a method for comprehensive utilization of green electricity coupled with coal and salt.

[0007] The present application provides a method for comprehensive utilization of green electricity coupled with coal and salt, comprising:

[0008] S1: transporting pulverized coal to a gasifier for gasification to obtain a crude synthesis gas;

[0009] S2: After the crude synthesis gas is transported to the scrubbing device, solid particulate impurities carried in the crude synthesis gas are removed to obtain a first synthesis gas;

[0010] S3: Refining the raw salt to obtain a saturated aqueous solution of refined salt, using the electricity generated by new energy to electrolyze the saturated aqueous solution of refined salt, and purifying it to prepare H2, while obtaining sodium chlorate as a by-product;

[0011] S4: oxidize part of the H2 in S3 to obtain hydrogen peroxide; the first synthesis gas in S2 enters the conversion process, so that part of the CO is converted into H2 to adjust the carbon-hydrogen ratio, and a mixed gas is obtained, and the mixed gas is transported to a purification device to remove impurities in the mixed gas and obtain a second synthesis gas;

[0012] transporting part of the H2 in S3 and the second synthesis gas to a methanol synthesis unit to obtain methanol;

[0013] S5: transporting part of the methanol in S4 to a dehydration unit to obtain dimethyl ether, and transporting the dimethyl ether and CO in the second synthesis gas to an ethanol synthesis unit to obtain ethanol;

[0014] transporting part of the methanol in S4 and the CO in the second synthesis gas to an acetic acid synthesis unit to obtain acetic acid;

[0015] transporting part of the methanol in S4 to an olefin synthesis unit to obtain ethylene and propylene;

[0016] S6: transporting the propylene in S5 and the hydrogen peroxide in S4 to an oxidation synthesis unit to obtain propylene oxide;

[0017] S7: transporting the acetic acid and ethylene in S5 to a polymerization unit to obtain vinyl acetate;

[0018] S8: Polymerize the vinyl acetate in S7 and the ethylene in S5 to obtain EVA.

[0019] In a possible implementation, raw coal is ground into pulverized coal with a size of less than 100 meshes.

[0020] In a possible implementation, in S1, the temperature of the pulverized coal gasified in the gasifier is 1300-1500°C.

[0021] In a possible implementation, in S3, the concentration of the saturated aqueous solution of refined salt is 25-28%.

[0022] In a possible implementation, in S3, the new energy is one or more of wind energy, solar energy, water energy, ocean energy, and biomass energy.

[0023] In one possible implementation, in S4, the carbon-to-hydrogen ratio is 2:1.

[0024] In a possible implementation, in S4, the purification device includes a conversion gas separation tank, a conversion gas washing tower, an ammonia washing tower and a low-temperature methanol washing section; the mixed gas is transported to the conversion gas separation tank to separate the water and enter the conversion gas washing tower; the conversion gas washing tower removes H2S, COS and part of CO2 and other components in the mixed gas and then enters the ammonia washing tower; the ammonia washing tower removes NH3 in the mixed gas and enters the low-temperature methanol washing section; the low-temperature methanol washing section removes CO2, H2S and COS in the mixed gas to obtain a second synthesis gas.

[0025] In a possible implementation, in S5, the amount of methanol consumed per unit product of ethanol synthesized by the ethanol synthesis unit is 0.73-0.78; the amount of methanol consumed per unit product of acetic acid synthesized in the acetic acid synthesis unit is 0.5-0.56; the amount of methanol consumed per unit product of ethylene and propylene synthesized in the olefin synthesis unit is 2.5-2.8.

[0026] In a possible implementation, the slag obtained in S1 and the salt mud obtained in S3 are used as raw materials to produce cement.

[0027] In a possible implementation, in S3, a non-diaphragm process is used in the electrolysis process of a saturated aqueous solution of refined salt, and the chlorine gas and sodium hydroxide produced by the electrolysis naturally produce sodium chlorate.

[0028] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects:

[0029] The embodiment of the present application provides a method for the comprehensive utilization of green electricity coupled with coal and salt. The method comprises: conveying pulverized coal to a gasifier for gasification to obtain a crude synthesis gas; conveying the crude synthesis gas to a washing device, removing impurities such as solid particles carried in the crude synthesis gas, and obtaining a first synthesis gas; refining the raw salt to obtain a saturated aqueous solution of refined salt, and electrolyzing the saturated aqueous solution of refined salt, and purifying to prepare H2, and obtaining sodium chlorate as a by-product; oxidizing part of the H2 in the above steps to obtain hydrogen peroxide; the first synthesis gas enters a conversion process, so that part of CO is converted into H2, and a mixed gas is obtained, and the mixed gas is conveyed to a purification device, impurities in the mixed gas are removed, and a second synthesis gas is obtained; part of the H2 in the above steps is oxidized ... Mix with the second synthesis gas to adjust the carbon-hydrogen ratio, and transport to the methanol synthesis unit to obtain methanol; transport part of the methanol in the above steps and the CO in the second synthesis gas to the dehydration unit and the acetic acid synthesis unit respectively to obtain dimethyl ether and acetic acid; transport dimethyl ether and the CO in the second synthesis gas to the ethanol synthesis unit to obtain ethanol; transport part of the methanol to the olefin synthesis unit to obtain ethylene and propylene; transport propylene and hydrogen peroxide to the oxidation synthesis unit to obtain propylene oxide; transport acetic acid and ethylene to the polymerization unit to obtain vinyl acetate; polymerize vinyl acetate and ethylene to obtain EVA (ethylene-vinyl acetate copolymer). The method includes using coal as a raw material to prepare the second synthesis gas, using raw salt as a raw material to electrolyze H2, and then coupling the second synthesis gas obtained by coal gasification with raw salt electrolysis to produce H2 to prepare methanol, ethylene, propylene and acetic acid intermediate products, and then coupling the intermediate products to produce ethanol, EVA, propylene oxide resin and other high-end coal-based materials. In addition, the raw salt is refined to obtain a saturated aqueous solution of refined salt, which is then electrolyzed to obtain H2 and sodium chlorate. Part of the H2 is used to supplement the second synthesis gas to adjust the carbon-hydrogen ratio, thereby reducing carbon dioxide emissions. Part of the H2 is oxidized to produce hydrogen peroxide, which is then combined with propylene to synthesize epoxy resin. It can also be used to produce high-end coal-based materials such as polyurethane and polyether polyols. Therefore, this method of green electricity coupled with comprehensive utilization of coal and salt constructs a coal-salt-electricity-chemical-material industrial structure through the joint use of coal and salt resources to achieve comprehensive recycling. It has a long industrial chain, diversified and high-end products, higher resource utilization, a low-carbon production process, and higher added value. At the same time, this method also realizes the replacement of coal and salt for petroleum in the production of chemicals and new materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 A process flow chart of the method for comprehensive utilization of green electricity coupled with coal and salt provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are partial embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0034] The present application embodiment provides a method for comprehensive utilization of green electricity coupled with coal and salt, such as Figure 1 The method for comprehensive utilization of green electricity coupled with coal and salt includes:

[0035] S1: The pulverized coal is transported to a gasifier for gasification to obtain a raw synthesis gas.

[0036] S2: After the raw synthesis gas is transported to the scrubbing device, solid particle impurities carried in the raw synthesis gas are removed to obtain the first synthesis gas.

[0037] It should be noted that the washing device in the embodiment of the present application is a washing tower, and the solid particles carried in the raw synthesis gas are removed by water washing in the washing tower.

[0038] S3: Refining the raw salt to obtain a saturated aqueous solution of refined salt, electrolyzing the saturated aqueous solution of refined salt, and purifying it to prepare H2, while obtaining sodium chlorate as a by-product.

[0039] It should be noted that the H2 prepared in the examples of the present application has high purity.

[0040] S4: Part of the H2 in S3 is oxidized to obtain hydrogen peroxide; the first synthesis gas in S2 enters the conversion process to convert part of the CO into H2, and a mixed gas is obtained, and the mixed gas is transported to a purification device to remove impurities in the mixed gas to obtain a second synthesis gas; part of the H2 in S3 is mixed with the second synthesis gas to adjust the carbon-hydrogen ratio, and is transported to a methanol synthesis device to obtain methanol.

[0041] It should be noted that the second synthesis gas in the embodiment of the present application is CO and H2. Hydrogen peroxide is obtained by oxidizing part of the H2 in S3, wherein the oxidized oxygen comes from the system air separation oxygen.

[0042] S5: transporting part of the methanol in S4 to a dehydration unit to obtain dimethyl ether, and transporting the dimethyl ether and CO in the second synthesis gas to an ethanol synthesis unit to obtain ethanol;

[0043] transporting part of the methanol in S4 and the CO in the second synthesis gas to an acetic acid synthesis unit to obtain acetic acid;

[0044] Part of the methanol in S4 is transported to an olefin synthesis unit to obtain ethylene and propylene.

[0045] It should be noted that the dimethyl ether and the CO in the second synthesis gas are transported to the ethanol synthesis unit to obtain ethanol, wherein the CO in the second synthesis gas is first hydroxylated and then reacts with the dimethyl ether to obtain ethanol.

[0046] Part of the methanol in S4 and the CO in the second synthesis gas are transported to an acetic acid synthesis unit to obtain acetic acid, wherein the CO in the second synthesis gas is first hydroxylated and then reacts with methanol to obtain acetic acid.

[0047] S6: The propylene in S5 and the hydrogen peroxide in S4 are transported to an oxidation synthesis unit to obtain propylene oxide.

[0048] It should be noted that the method can also be extended to obtain new coal-based materials such as polyurethane and polyether polyols.

[0049] S7: The acetic acid and ethylene in S5 are transported to a polymerization unit to obtain vinyl acetate.

[0050] S8: The vinyl acetate in S7 and the ethylene in S5 are polymerized to obtain EVA (ethylene-vinyl acetate copolymer).

[0051] It should be noted that the method includes preparing the second synthesis gas with coal as raw material, preparing H2 by electrolysis of raw salt as raw material, and coupling the second synthesis gas obtained by coal gasification with H2 obtained by electrolysis of raw salt to prepare methanol, ethylene, propylene and acetic acid intermediate products, and then coupling the intermediate products to produce ethanol, EVA and propylene oxide resin and other high-end coal-based materials. In addition, the raw salt is refined to obtain a saturated aqueous solution of refined salt, and H2 and sodium chlorate are obtained by electrolysis. Part of the H2 supplements the second synthesis gas to adjust the carbon-hydrogen ratio, thereby reducing carbon dioxide emissions, and part of the H2 is oxidized to produce hydrogen peroxide, which is synthesized with propylene to form epoxy resin, and can also be extended to produce high-end coal-based materials such as polyurethane and polyether polyols. Therefore, the method of green electricity coupling comprehensive utilization of coal and salt jointly constructs a coal-salt-electricity-chemical-material industrial structure through coal and salt resources to achieve comprehensive recycling, with a long industrial chain, diversified and high-end products, higher resource utilization, low-carbon production process, and higher added value. At the same time, the method also realizes the replacement of coal and salt for petroleum in the production of chemicals and new materials.

[0052] In the embodiment of the present application, the raw coal is ground into pulverized coal with a size of less than 100 mesh.

[0053] In the embodiment of the present application, in S1, the temperature of the pulverized coal gasified in the gasifier is 1300-1500°C.

[0054] In the embodiment of the present application, in S3, the concentration of the saturated aqueous solution of refined salt is 25-28%.

[0055] In the embodiment of the present application, the new energy is one or more of wind energy, solar energy, water energy, ocean energy, and biomass energy.

[0056] In the embodiment of the present application, in S4, the carbon-to-hydrogen ratio is 2:1.

[0057] It should be noted that, under normal circumstances, CO:H2 in the first synthesis gas is 2:1, but the actual synthesis of methanol requires CO:H2=1:2. Therefore, CO needs to be converted into H2, that is, CO+H2O=H2+CO2; each conversion of one hydrogen will produce one CO2. If 1 standard cubic meter of hydrogen is added in this process, 1 standard cubic meter of CO2 production can be reduced, thereby significantly reducing carbon emissions. The hydrogen added in this application comes from a saturated aqueous solution of refined salt, and H2 is obtained by electrolysis.

[0058] Specifically, part of the CO in the first synthesis gas is transformed into H2 and CO2 with the water vapor it carries, and then transported to a purification device to remove impurities to obtain CO and H2.

[0059] In the embodiment of the present application, in S4, the purification device includes a conversion gas separation tank, a conversion gas washing tower, an ammonia washing tower and a low-temperature methanol washing section; the mixed gas is transported to the conversion gas separation tank to separate the water and enter the conversion gas washing tower; the conversion gas washing tower removes H2S, COS and part of CO2 and other components in the mixed gas and then enters the ammonia washing tower; the ammonia washing tower removes NH3 in the mixed gas and enters the low-temperature methanol washing section; the low-temperature methanol washing section removes CO2, H2S and COS in the mixed gas to obtain a second synthesis gas.

[0060] It should be noted that after the mixed gas is cooled by heat exchange and the water is separated in the conversion gas separation tank, it enters the desulfurization section at the bottom of the conversion gas washing tower. The conversion gas washing tower is divided into four sections, the bottom section (section A) is the desulfurization section, and the top three sections (sections B, C, and D) are the decarbonization sections. In the desulfurization section, the mixed gas is washed with a CO2-rich methanol liquid to remove H2S, COS, and some CO2 components, and then it is drawn out from the conversion gas washing tower and enters the desulfurization conversion gas cooler, where it exchanges heat with the purified gas, CO2 gas, and tail gas for cooling. Part of it is cooled by the desulfurization conversion gas deep freezer, and then it exchanges heat with the condensed CO2 vapor through the liquid CO2 evaporation heat exchanger, the temperature is further reduced, and it enters the desulfurization conversion gas separation tank to separate the CO2 condensate. The gas phase of the desulfurization conversion gas separation tank returns to section B of the conversion gas washing tower for further washing. The liquid phase of the desulfurization conversion gas separation tank enters the medium-pressure flash tank. After the medium-pressure flash evaporation recovers H2, it enters the liquid CO2 evaporation heat exchanger for evaporation and heat exchange. The gasified high-pressure CO2 product gas is sent out of the boundary area after heat exchange in the conversion gas cooler. The mixed gas is washed with lean methanol liquid at the top of the conversion gas washing tower to remove CO2 in the mixed gas until it meets the purification requirements. The purified gas is drawn out from the top of the tower and sent to the ammonia washing tower after heat exchange in the desulfurization conversion gas cooler and the conversion gas cooler. The ammonia washing tower removes NH3 from the mixed gas and enters the low-temperature methanol washing section. The low-temperature methanol washing section removes CO2, H2S, and COS (carbonyl sulfide, CARBONYL SULFIDE) from the conversion gas respectively, and sends the removed qualified COS to the downstream device, while the regenerated H2S is sent to the catalytic oxidation sulfur recovery system. Low-temperature methanol washing is a physical absorption method. The absorption of CO2, H2S and COS by methanol is completed in an absorption tower under low temperature and high pressure. The methanol solutions that have absorbed CO2, H2S and COS (called sulfur-free rich methanol and sulfur-containing rich methanol) are throttled and depressurized respectively (a small amount of H2 and CO are also absorbed in the absorption process and can be recovered after throttling and depressurization flash evaporation) to obtain clean H2 and CO, i.e., the second synthesis gas.

[0061] Specifically, the ammonia scrubbing tower of the embodiment of the present application removes NH3 and reduces it to below 1 ppm.

[0062] In the embodiment of the present application, in S5, the amount of methanol consumed per unit product of ethanol synthesized by the ethanol synthesis unit is 0.73-0.78; the amount of methanol consumed per unit product of acetic acid synthesized in the acetic acid synthesis unit is 0.5-0.56; the amount of methanol consumed per unit product of ethylene and propylene synthesized in the olefin synthesis unit is 2.5-2.8.

[0063] In the embodiment of the present application, the slag obtained in S1 and the salt mud obtained in S3 are used as raw materials to produce cement.

[0064] In the embodiment of the present application, in S3, a non-diaphragm process is used in the electrolysis process of a saturated aqueous solution of refined salt, and the chlorine gas and sodium hydroxide produced by electrolysis naturally produce sodium chlorate.

[0065] It should be noted that the electrolysis of salt water will produce the following reaction:

[0066] The reaction formula is: 2NaCl+2H2O=2NaOH+H2+Cl2,

[0067] Because there is no diaphragm, the chlorine will escape and react with sodium hydroxide to form sodium hypochlorite:

[0068] The reaction formula is: 2NaOH+Cl2=2NaClO+H2.

[0069] Specifically, when the diaphragm method is used to electrolyze salt water, the electrolytic cell is divided into an anode area and a cathode area to prevent Cl2 from reacting with NaOH; when the cold salt water is electrolyzed without a diaphragm, Cl2 and NaOH are in full contact, and the final products in the electrolytic cell are only NaClO and H2.

[0070] Furthermore, the embodiment of the present application is based on the "coal, salt, chemical, electricity, and material" industrial chain, realizing the coupling of new energy with coal chemical industry and salt chemical industry to produce chemical products and new materials, with the characteristics of high energy utilization efficiency, low energy consumption, and low carbon emissions.

[0071] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0072] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A method for comprehensive utilization of green electricity coupled with coal and salt, characterized in that: include: S1: transporting pulverized coal to a gasifier for gasification to obtain a crude synthesis gas; S2: After the crude synthesis gas is transported to the scrubbing device, solid particulate impurities carried in the crude synthesis gas are removed to obtain a first synthesis gas; S3: Refining the raw salt to obtain a saturated aqueous solution of refined salt, using the electricity generated by new energy to electrolyze the saturated aqueous solution of refined salt, and purifying it to prepare H2, while obtaining sodium chlorate as a by-product; S4: Oxidize part of the H2 in S3 to obtain hydrogen peroxide; the first synthesis gas in S2 enters the conversion process, so that part of the CO is converted into H2, and a mixed gas is obtained, and the mixed gas is transported to a purification device to remove impurities in the mixed gas and obtain a second synthesis gas; Mixing part of the H2 in S3 with the second synthesis gas to adjust the carbon-hydrogen ratio, and transporting the mixture to a methanol synthesis unit to obtain methanol; S5: transporting part of the methanol in S4 to a dehydration unit to obtain dimethyl ether, and transporting the dimethyl ether and CO in the second synthesis gas to an ethanol synthesis unit to obtain ethanol; transporting part of the methanol in S4 and the CO in the second synthesis gas to an acetic acid synthesis unit to obtain acetic acid; transporting part of the methanol in S4 to an olefin synthesis unit to obtain ethylene and propylene; S6: transporting the propylene in S5 and the hydrogen peroxide in S4 to an oxidation synthesis unit to obtain propylene oxide; S7: transporting the acetic acid and ethylene in S5 to a polymerization unit to obtain vinyl acetate; S8: Polymerize the vinyl acetate in S7 and the ethylene in S5 to obtain EVA.

2. The method for comprehensive utilization of green electricity coupled with coal and salt according to claim 1, characterized in that: Grind the raw coal into powder coal with a size of less than 100 mesh.

3. The method for comprehensive utilization of green electricity coupled with coal and salt according to claim 1, characterized in that: In S1, the temperature of pulverized coal gasification in the gasifier is 1300-1500°C.

4. The method for comprehensive utilization of green electricity coupled with coal and salt according to claim 1, characterized in that: In S3, the concentration of the saturated aqueous solution of refined salt is 25-28%.

5. The method for comprehensive utilization of green electricity coupled with coal and salt according to claim 4, characterized in that: In S3, new energy is one or more of wind energy, solar energy, hydro energy, ocean energy, and biomass energy.

6. The method for comprehensive utilization of green electricity coupled with coal and salt according to claim 1, characterized in that: In S4, the carbon-hydrogen ratio is 2:

1.

7. The method for comprehensive utilization of green electricity coupled with coal and salt according to claim 6, characterized in that: In S4, the purification device includes a shift gas separation tank, a shift gas washing tower, an ammonia washing tower and a low-temperature methanol washing section; The mixed gas is transported to the shift gas separation tank to separate the water and enter the shift gas scrubber; The shift gas scrubber removes H2S, COS and some CO2 components from the mixed gas before it enters the ammonia scrubber; The ammonia washing tower removes NH3 from the mixed gas and enters the low-temperature methanol washing section; The low-temperature methanol washing section removes CO2, H2S and COS from the mixed gas to obtain the second synthesis gas.

8. The method for comprehensive utilization of green electricity coupled with coal and salt according to claim 1, characterized in that: In S5, the ethanol synthesized by the ethanol synthesis unit consumes 0.73-0.78 methanol per unit product; The amount of methanol consumed per unit of acetic acid synthesized in the acetic acid synthesis unit is 0.5-0.56; The amount of methanol consumed per unit product of ethylene and propylene synthesized in the olefin synthesis unit is 2.5-2.

8.

9. The method for comprehensive utilization of green electricity coupled with coal and salt according to claim 1, characterized in that: The slag obtained in S1 and the salt mud obtained in S3 are used as raw materials to produce cement.

10. The method for comprehensive utilization of green electricity coupled with coal and salt according to claim 1, characterized in that: In S3, a non-diaphragm process is used in the electrolysis of a saturated aqueous solution of refined salt, and the chlorine gas and sodium hydroxide produced by electrolysis naturally produce sodium chlorate.

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