Production system for preparing ethanol based on IGCC co-production CO

Abstract

The invention relates to the field of IGCC poly-generation and the technical field of scheduling control, and discloses a production system for preparing ethanol based on IGCC co-production CO, the production system comprises an ethanol production unit, a synthesis gas production unit and a power generation unit, the system comprises a CO separation module, a hydrogen production line and a methyl acetate production line which are connected with the output end of the CO separation module, an ethanol production line connected with the output ends of the hydrogen production line and the methyl acetate production line, and a residual recovery line connected with the hydrogen production line, the methyl acetate production line and the ethanol production line, according to the invention, through coupling production of power generation and ethanol, idle IGCC unit assets caused by limited generating capacity are avoided, and improvement of the utilization rate of the IGCC assets is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of IGCC polygeneration, and in particular to a production system for preparing ethanol based on IGCC cogeneration of CO. Background Art

[0002] With the proposal of "double carbon", clean and low-carbon utilization of coal is of vital importance. Among the ways to clean and efficient utilization of coal, integrated gasification combined cycle (IGCC) technology is an important development direction.

[0003] IGCC is a clean coal power generation technology that organically integrates coal gasification and gas-steam combined cycle systems. It is an important direction for the development of clean coal utilization. Its excellent environmental performance and ability to capture carbon dioxide determine that this technology has great development potential. The reliability of IGCC units currently operating worldwide has greatly improved. In 2018, Huaneng Tianjin IGCC unit operated continuously for 3,993 hours, breaking the continuous operation record of similar units. At present, the main problem hindering the development of IGCC units is the economic efficiency of the units.

[0004] China's original intention to develop the fuel ethanol industry was to digest aged grain. Currently, the raw materials for fuel ethanol are mainly sugar-containing substances such as corn, cassava, sweet potato, and wood cellulose, which can replace part of the oil and save oil resources. Using coal to make ethanol can make full use of my country's coal resources.

[0005] IGCC is different from conventional coal-fired power generation. The synthesis gas produced in the process can be converted into chemical products such as ethanol through chemical processes.

[0006] In the IGCC system, coal is gasified into medium- and low-calorific value coal gas. After purification, the sulfides, dust and other impurities contained in the coal gas are removed to become clean gas fuel, which is sent to the gas turbine and burned in the combustion chamber. After the coal gas is burned, it drives the gas turbine to generate work and generate electricity. The steam generated by the high-temperature exhaust gas in the waste heat boiler drives the steam turbine to generate work and generate electricity.

[0007] In the prior art, the integrated coal gasification combined cycle is Figure 1The process completes the entire power generation process, the equipment process chain is long, and the terminal power island device is subject to grid dispatch. At the same time, the existing coal-fired machines have a low load rate on the grid, a long standby time, and grid dispatch fluctuates greatly due to the access of new energy sources. The "National Energy Administration's 2023 National Electric Power Reliability Annual Report" pointed out that the average utilization hours (full load power generation hours) of 100-1000MW coal-fired power generating units are about 4704.91 hours, the operating hours are 7107.83 hours, the load rate is 66.19%, and the standby time is 934.49h. In order to ensure the safety of the power grid, the generators of coal-fired power plants are idle, and the assets of coal-fired generators are seriously wasted. This situation is more prominent in efficient and environmentally friendly IGCC coal-fired power units. Due to the short annual operating time of the power island, the assets of the entire process are idle, resulting in a waste of asset value. Summary of the invention

[0008] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0009] In view of the above-mentioned problems existing in the existing production system for preparing ethanol based on IGCC co-production of CO, the present invention is proposed.

[0010] Therefore, the object of the present invention is to provide a production system for preparing ethanol based on IGCC co-production of CO, which can give full play to the production capacity of the IGCC unit and co-produce ethanol when the unit is not generating electricity or is not generating electricity at full load.

[0011] In order to solve the above technical problems, the present invention provides the following technical solutions: a production system based on co-production of ethanol energy storage, the production system comprising an ethanol production unit, a synthesis gas production unit and a power generation unit, wherein the ethanol production unit comprises a CO separation module, a hydrogen production line and a methyl acetate production line connected to the output end of the CO separation module, an ethanol production line connected to the output ends of the hydrogen production line and the methyl acetate production line, and a surplus recovery line connected to the hydrogen production line, the methyl acetate production line and the ethanol production line.

[0012] As a preferred solution of the production system for preparing ethanol based on IGCC co-production of CO according to the present invention, the hydrogen production circuit includes a shift reaction module connected to the output end of the CO separation module and a hydrogen purification module connected to the output end of the shift reaction module; the methyl acetate production circuit includes a carbonylation reaction module connected to the output end of the CO separation module and a dehydration module connected to the input end of the carbonylation reaction module; the ethanol production circuit includes a hydrogenation reaction module connected to the output ends of the hydrogen purification module and the carbonylation reaction module, an ethanol storage tank connected to the output ends thereof, and a methanol circulation pipeline connected between the hydrogenation reaction module and the dehydration module.

[0013] As a preferred solution of the production system for preparing ethanol based on IGCC co-production of CO according to the present invention, methanol and water are added from the input end of the dehydration module.

[0014] As a preferred solution of the production system for preparing ethanol based on IGCC co-production of CO described in the present invention, the residual recovery line includes a gas storage tank, a residual gas adsorption pipeline connected between the CO separation module and the gas storage tank, a purge gas pipeline connected between the dehydration module and the gas storage tank, and a hydrogen purge gas pipeline connected between the hydrogenation reaction module and the gas storage tank.

[0015] As a preferred solution of the production system for preparing ethanol based on IGCC co-production of CO as described in the present invention, it also includes: a synthesis gas production unit, which includes an air separation device, a gasification device, a dust removal device, and a desulfurization device connected in sequence; a power generation unit, which includes a gas turbine device connected to the output end of the desulfurization device, a waste heat boiler device for receiving the exhaust gas output by the gas turbine device, and a steam turbine connected to the output end of the waste heat boiler device.

[0016] As a preferred solution of the production system for preparing ethanol based on IGCC co-production of CO described in the present invention, the output end of the desulfurization device is connected to a sulfur recovery device, air is introduced from the input end of the air separation device, and coal powder is added from the input end of the gasification device.

[0017] As a preferred solution of the production system for preparing ethanol based on IGCC co-production of CO according to the present invention, the gas engine device and the steam turbine drive the generator set to output electrical energy; the input end of the CO separation module is connected to the output pipeline of the desulfurization device.

[0018] As a preferred solution of the production system for preparing ethanol based on IGCC co-production of CO described in the present invention, the surplus recovery line also includes an ethanol discharge pipeline connecting the ethanol storage tank and the gas engine device.

[0019] As a preferred solution of the production system for preparing ethanol based on IGCC co-production of CO according to the present invention, wherein: S1: introducing air into the air separation unit, feeding coal powder into the gasification unit, and generating synthesis gas after passing through the dust removal unit and the desulfurization unit; S2: outputting the generated synthesis gas to the power generation unit and the ethanol production unit in a preset ratio; S3: The synthesis gas enters the gas turbine device for combustion, driving the generator set to generate electricity, and the tail gas after combustion of the gas turbine device is discharged to the waste heat boiler device. The steam recovered by the waste heat boiler device drives the generator set to generate electricity through the steam turbine; S4: The synthesis gas enters the CO separation module and is divided into two paths for hydrogen production and methyl acetate production. The two products react to produce ethanol, which is finally collected in the ethanol storage tank; S5: According to the grid dispatching data, the preset ratio is adjusted to match the power generation of the power generation unit.

[0020] As a preferred solution of the production system for preparing ethanol based on IGCC co-production of CO according to the present invention, wherein: in the process of adjusting the preset ratio according to the grid dispatching data to match the power generation of the power generation unit, When the grid dispatch needs to increase the power generation of the power generation unit, the ethanol production is reduced by reducing the amount of synthesis gas allocated to the ethanol production unit; When the power generation of the power generation unit needs to be reduced, the amount of synthesis gas entering the power generation unit is reduced, the amount of synthesis gas allocated to the ethanol production unit is increased, and the production of ethanol is increased.

[0021] Beneficial effects of the present invention: 1. IGCC coupling production of ethanol, under the premise of a certain power generation of the unit (controlled by the power grid), fully utilizes the asset value of air separation and gasification units, and the ethanol produced is a high value-added product, which can improve the economic efficiency of IGCC power plants and solve the problem of poor economic efficiency of IGCC; 2. Through deep coupling, the purge gas produced by ethanol is stored in the purge gas storage tank, which can further improve the variable load capacity and rate of IGCC; 3. The stored ethanol can be used as an energy storage device and as a backup fuel for the gas turbine. Once the upstream equipment on the power island fails, the unit can continue to generate electricity by switching to ethanol fuel, which can reduce the probability of non-stop operation. Each reduction in non-stop operation can reduce costs by about 300,000 yuan. 4. The additional ethanol production capacity can effectively alleviate the domestic demand for fuel ethanol. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them: Figure 1 The present invention is a circuit diagram of a coal gasification combined production system in the prior art.

[0023] Figure 2 This is a schematic diagram of the structure of the ethanol production unit of the production system for preparing ethanol based on IGCC co-production of CO in the present invention.

[0024] Figure 3 This is a schematic diagram of the connection lines between the synthesis gas production unit and the power generation unit of the production system for preparing ethanol based on IGCC co-production of CO in the present invention.

[0025] Figure 4 The figure is a schematic diagram of the overall process line of the production system for preparing ethanol by co-producing CO based on IGCC according to the present invention.

[0026] Figure 5 This is a schematic diagram of load data for the production system of preparing ethanol based on IGCC co-production of CO in the present invention. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0030] Secondly, the present invention is described in detail in conjunction with schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams representing the device structures will not be partially enlarged according to general proportions, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention.

[0031] Example 1 Reference Figures 1 to 4, which is the first embodiment of the present invention, provides a production system for preparing ethanol based on IGCC co-production of CO, the production system includes an ethanol production unit 100, a synthesis gas production unit 200 and a power generation unit 300, wherein the synthesis gas production unit 200 is used to generate synthesis gas required for gas turbine and ethanol production, the power generation unit 300 uses the synthesis gas to generate electricity, and the ethanol production unit 100 uses the synthesis gas to produce ethanol.

[0032] Specifically, the synthesis gas production unit 200 includes an air separation device 201, a gasification device 202, a dust removal device 203, and a desulfurization device 204 which are connected in sequence; wherein the output end of the desulfurization device 204 is connected to a sulfur recovery device 205, air is introduced from the input end of the air separation device 201, and coal powder is added from the input end of the gasification device 202.

[0033] Further, air is introduced into the air separation device 201 to separate oxygen, nitrogen, etc., and introduced into the gasification device 202. At the same time, the pulverized coal is also introduced into the gasification device 202 to mix with oxygen, nitrogen, etc. to form a crude synthesis gas. After the crude synthesis gas passes through the dust removal device 203, dust and other impurities are removed. After that, the sulfide contained is removed by the desulfurization device 204 to form a relatively pure synthesis gas and output. The main component of this synthesis gas is CO (carbon monoxide). It should be noted that the sulfide removed from the desulfurization device 204 can be passed through the sulfur recovery device to produce sulfur and other products.

[0034] The power generation unit 300 includes a gas turbine device 301 connected to the output end of the desulfurization device 204, a waste heat boiler device 302 receiving tail gas output from the gas turbine device 301, and a steam turbine 303 connected to the output end of the waste heat boiler device 302. The gas turbine device 301 and the steam turbine 303 drive the generator set to output electrical energy.

[0035] Furthermore, part of the output synthesis gas is passed into the combustion engine device 301, and the fuel combustion drives the generator set to generate electricity, and the tail gas of the combustion engine device 301 is discharged to the waste heat boiler device 302 to recover the waste heat in the tail gas. The hot steam generated by the waste heat boiler device 302 is transported to the steam turbine 303, and then drives the generator set to generate electricity; the generated electricity is all connected to the external power grid through the power equipment. Another part of the output synthesis gas is passed into the ethanol production unit 100 for the production of ethanol.

[0036] Specifically, the ethanol production unit 100 includes a CO separation module 101, a hydrogen production line 102 and a methyl acetate production line 103 connected to the output end of the CO separation module 101, an ethanol production line 104 connected to the output ends of the hydrogen production line 102 and the methyl acetate production line 103, and a surplus recovery line 105 connected to the hydrogen production line 102, the methyl acetate production line 103 and the ethanol production line 104.

[0037] The CO separation module 101 is used to separate CO from the synthesis gas; the hydrogen production line 102 is used to generate hydrogen through the CO reaction; the methyl acetate production line 103 is used to generate methyl acetate by the reaction of methanol and CO; and the ethanol production line 104 is used to generate ethanol by the reaction of hydrogen and methyl acetate. The residual recovery line 105 is used to recover the unreacted raw materials and intermediate products in the ethanol production process.

[0038] Furthermore, the hydrogen production line 102 includes a shift reaction module 102a connected to the output end of the CO separation module 101 and a hydrogen purification module 102b connected to the output end of the shift reaction module 102a.

[0039] Among them, the conversion reaction module 102a is used for the reaction of CO with water to generate CO2 and hydrogen, and the generated hydrogen is purified in the hydrogen purification module 102b.

[0040] The methyl acetate production line 103 includes a carbonylation reaction module 103a connected to the output end of the CO separation module 101 and a dehydration module 103b connected to the input end of the carbonylation reaction module 103a; methanol and water are added from the input end of the dehydration module 103b.

[0041] The dehydration module 103b is used for inputting raw materials methanol and water, and the carbonylation reaction module 103a is used for the carbonylation reaction of methanol and CO to generate methyl acetate; the methanol can be purchased from outside, and the water can be the water used in the power plant.

[0042] The ethanol production line 104 includes a hydrogenation reaction module 104a connected to the output ends of the hydrogen purification module 102b and the carbonylation reaction module 103a, an ethanol storage tank 104b connected to the output ends thereof, and a methanol circulation pipeline 104c connected between the hydrogenation reaction module 104a and the dehydration module 103b.

[0043] The hydrogen from the hydrogen purification module 102b and the methyl acetate from the carbonylation reaction module 103a react in the hydrogenation reaction module 104a to generate an ethanol product. The ethanol storage tank 104b is used to store the produced ethanol. The methanol and other products generated in the reaction are input into the dehydration module 103b through the methanol circulation pipeline 104c for recycling.

[0044] Furthermore, the residual recovery line 105 includes a gas storage tank 105a, a residual gas adsorption pipeline 105b connected between the CO separation module 101 and the gas storage tank 105a, a CO purge gas pipeline 105c connected between the dehydration module 103b and the gas storage tank 105a, and a hydrogen purge gas pipeline 105d connected between the hydrogenation reaction module 104a and the gas storage tank 105a.

[0045] The gas storage tank 105a is used to temporarily store the intermediate products and excess production raw materials produced during the ethanol production process; the residual gas adsorption pipeline 105b connects the CO separation module 101 with the gas storage tank 105a. It is used to export the CO residual gas in the CO synthesis gas except for utilization, and pump it into the gas storage tank 105a through the booster compressor in the adsorption pipeline; the CO purge gas pipeline 105c connects the dehydration module 103b gas storage tank 105a, and is used to pass the CO purge gas (CO content is above 65%) in the dehydration module 103b into the gas storage tank 105a; the hydrogen purge gas pipeline 105d connects the hydrogenation reaction module 104a and the gas storage tank 105a, and is used to pass the hydrogen purge gas (H2 content is above 90%) in the hydrogenation reaction process into the gas storage tank 105a. The output end of the gas storage tank 105a is connected to the synthesis gas pipeline at the output end of the desulfurization device 204 through a pipeline, and is used to re-introduce the relevant gas in the gas storage tank 105a into the ethanol production unit 100 for continued production and utilization, thereby improving the utilization rate of raw materials.

[0046] The residual recovery line 105 also includes an ethanol discharge pipeline 105e connecting the ethanol storage tank 104b and the gas engine device 301; it is used to input the stored ethanol into the gas engine device 301 for operation of the gas engine device 301 to quickly increase the power output of the gas engine device 301.

[0047] Example 2 Reference Figures 1 to 4 , which is the second embodiment of the present invention. This embodiment is different from the embodiment 1 in that it is a system control method of the above embodiment 1, and the method includes the following steps: S1: Air is introduced into the air separation device 201, and the pulverized coal is fed into the gasification device 202. After passing through the dust removal device 203 and the desulfurization device 204, synthesis gas is generated; Specifically, each part of the complete IGCC system is operated to gasify and purify coal to form coal synthesis gas; the pulverized coal is mixed with oxygen produced by the air separation unit 201 in the gasification unit 202 to generate a raw synthesis gas (about 60% CO, about 25% H2, N2, a small amount of CH4, dust, H2S), and the dust is removed by the dust removal unit 203 to generate a primary synthesis gas (about 60% CO, about 25% H2, N2, a small amount of CH4, H2S), and then the sulfur is removed by the desulfurization unit 204 to generate a final synthesis gas (about 60% CO, about 25% H2, N2, a small amount of CH4); and the sulfur removed by the desulfurization unit 204 is converted into sulfur by the sulfur recovery unit 205.

[0048] S2: Outputting the generated synthesis gas to the power generation unit 300 and the ethanol production unit 100 in a preset ratio; S3: The synthesis gas enters the gas turbine device 301 for combustion, driving the generator set to generate electricity, and the tail gas after combustion of the gas turbine device 301 is discharged to the waste heat boiler device 302. The steam recovered by the waste heat boiler device 302 drives the generator set to generate electricity through the steam turbine 303; S4: the synthesis gas enters the CO separation module 101 and is divided into two paths for hydrogen production and methyl acetate production respectively. The two products react to obtain ethanol, which is finally collected in the ethanol storage tank 104b; S5: According to the grid dispatching data, the preset ratio is adjusted to match the power generation of the power generation unit 300.

[0049] This preset ratio is determined by the external grid dispatch data, and different ratios of syngas are allocated to the power generation unit 300 and the ethanol production unit 100 to achieve different outputs. The amount of syngas generated when the system is running at full load is constant, so the relationship between power generation and ethanol production must be inversely proportional.

[0050] When the grid dispatch needs to increase the power generation of the power generation unit 300, the power generation of the generator set can be quickly increased in a short period of time by reducing the amount of synthesis gas allocated to the ethanol production unit 100, or by synchronously transporting the ethanol in the ethanol storage tank 104b to the gas turbine device 301 for combustion; or when the synthesis gas output is not enough to meet the power generation demand of the power generation unit 300, the ethanol in the ethanol storage tank 104b can be used as a backup fuel.

[0051] When the power generation of the power generation unit 300 needs to be reduced, the amount of synthesis gas entering the power generation unit 300 is reduced, and the amount of synthesis gas allocated to the ethanol production unit 100 is increased for ethanol production, thereby avoiding idleness of the synthesis gas production unit 200 or product waste.

[0052] In each production system, the capacity and adjustment range of each unit, module and device are determined. Assume that the amount of syngas output by the desulfurization device 204 in the syngas production unit 200 is Y, and the power generation unit 300 matches the syngas amount at 100% capacity. The average load rate of the grid-dispatched IGCC unit is X, so the maximum load of the ethanol production unit is calculated according to the received syngas amount Y1=Y*(1-X).

[0053] Therefore, the IGCC co-production ethanol system can co-produce ethanol and improve the utilization rate of IGCC assets.

[0054] Example 3 Reference Figures 1 to 5 , which is the third embodiment of the present invention, is described below as an example based on the systems and methods of the above-mentioned embodiments 1 and 2: Since the current grid dispatches about 80% of the load for IGCC units, in order to maximize the use of assets, we choose to configure an ethanol production unit with 20% of the syngas as raw material. The approved annual utilization hours of the unit are 6,000 hours. If calculated at an 80% load rate, the annual operation hours are 7,500 hours (calculated at an availability rate of 90%, the IGCC available hours are 7,880 hours, which meets the operating time). At full load operation, the idle time of the entire IGCC power generation process of air separation, gasification, and power island (power generation unit 300) is 1,500 hours. If the load rate is 80%, the remaining 20% ​​of the syngas is used to build an ethanol production unit, and the ethanol unit is operated at full load, the income of the syngas ethanol production unit is equivalent to the income of power generation, and the 20% capacity of the power island is wasted at this time. At this time, the 20% capacity of the power island is used as peak-shaving capacity, which can be compared to the energy storage facilities of 20% of the power generation capacity, which is equivalent to the construction of energy storage facilities of 20% of the power generation capacity at "0" cost.

[0055] When this production system is in the process of variable load regulation: The IGCC unit operates at full capacity according to the air separation, gasification, purification and desulfurization devices. By adjusting the distribution ratio of the synthesis gas output by the desulfurization device 204, the adjustment range of the power generation unit 300 and the ethanol production unit 100 is further controlled.

[0056] Electricity dispatching is subject to real-time dispatching and control by the power grid. Due to the ethanol storage tank 104b, the load fluctuation can be smoothed by the storage tank. Therefore, the system is produced in the "electricity-to-ethanol" mode, the load range of the power generation device is 50%-100%, the load range of the ethanol device is 40%-110%, and the ethanol device can be shut down to meet the regulation range of the power generation device.

[0057] With the following relationship: V 合成气发电用 =V 合成气总 -V 合成气乙醇用The total amount of synthesis gas is constant, and the synthesis gas used for power generation is inversely proportional to the synthesis gas used for ethanol. The production of ethanol is determined by electricity. The variable load capacity of the ethanol unit determines the variable load capacity of the power generation unit.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A production system for preparing ethanol based on IGCC co-production of CO, characterized by: include, An ethanol production unit (100) comprises a CO separation module (101), a hydrogen production line (102) and a methyl acetate production line (103) connected to the output end of the CO separation module (101), an ethanol production line (104) connected to the output ends of the hydrogen production line (102) and the methyl acetate production line (103), and a surplus recovery line (105) connected to the hydrogen production line (102), the methyl acetate production line (103) and the ethanol production line (104).

2. The production system for preparing ethanol based on IGCC co-production of CO according to claim 1, characterized in that: The hydrogen production line (102) comprises a shift reaction module (102a) connected to the output end of the CO separation module (101) and a hydrogen purification module (102b) connected to the output end of the shift reaction module (102a); The methyl acetate production line (103) comprises a carbonylation reaction module (103a) connected to the output end of the CO separation module (101) and a dehydration module (103b) connected to the input end of the carbonylation reaction module (103a); The ethanol production line (104) comprises a hydrogenation reaction module (104a) connected to the output ends of the hydrogen purification module (102b) and the carbonylation reaction module (103a), an ethanol storage tank (104b) connected to the output ends thereof, and a methanol circulation pipeline (104c) connected between the hydrogenation reaction module (104a) and the dehydration module (103b).

3. The production system for preparing ethanol based on IGCC co-production of CO according to claim 2, characterized in that: Methanol is introduced from the input end of the dehydration module (103b).

4. The production system for preparing ethanol based on IGCC co-production of CO according to claim 3, characterized in that: The residual recovery line (105) comprises a gas storage tank (105a), a residual gas adsorption pipeline (105b) connected between the CO separation module (101) and the gas storage tank (105a), a CO purge gas pipeline (105c) connected between the dehydration module (103b) and the gas storage tank (105a), and a hydrogen purge gas pipeline (105d) connected between the hydrogenation reaction module (104a) and the gas storage tank (105a).

5. The production system for preparing ethanol based on IGCC co-production of CO according to claim 4, characterized in that: It also includes a synthesis gas production unit (200), which includes an air separation device (201), a gasification device (202), a dust removal device (203), and a desulfurization device (204) connected in sequence; A power generation unit (300) comprises a combustion engine device (301) connected to the output end of the desulfurization device (204), a waste heat boiler device (302) receiving tail gas outputted from the combustion engine device (301), and a steam turbine (303) connected to the output end of the waste heat boiler device (302).

6. The production system for preparing ethanol based on IGCC co-production of CO according to claim 5, characterized in that: The output end of the desulfurization device (204) is connected to a sulfur recovery device (205), air is introduced from the input end of the air separation device (201), and coal powder is added from the input end of the gasification device (202).

7. The production system for preparing ethanol based on IGCC co-production of CO according to claim 6, characterized in that: The combustion engine device (301) and the steam turbine (303) drive the generator set to output electric energy; The input end of the CO separation module (101) is connected to the output pipeline of the desulfurization device (204).

8. The production system for preparing ethanol based on IGCC co-production of CO according to claim 7, characterized in that: The residual recovery line (105) also includes an ethanol discharge pipeline (105e) connecting the ethanol storage tank (104b) and the combustion engine device (301).

9. The production system for preparing ethanol based on IGCC co-production of CO according to claim 8, characterized in that: Air is introduced into the air separation device (201), and coal powder is fed into the gasification device (202), and after passing through the dust removal device (203) and the desulfurization device (204), synthesis gas is generated; Outputting the generated synthesis gas to the power generation unit (300) and the ethanol production unit (100) in a preset ratio; The synthesis gas enters the combustion engine device (301) for combustion, driving the generator set to generate electricity, and the tail gas after combustion of the combustion engine device (301) is discharged to the waste heat boiler device (302), and the steam recovered by the waste heat boiler device (302) drives the generator set to generate electricity through the steam turbine (303); The synthesis gas enters the CO separation module (101) and is divided into two paths for hydrogen production and methyl acetate production respectively. The two products react to produce ethanol, which is finally collected in the ethanol storage tank (104b); According to the grid dispatching data, the preset ratio is adjusted to match and adjust the power generation of the power generation unit (300).

10. The production system for preparing ethanol based on IGCC co-production of CO according to claim 9, characterized in that: In the process of adjusting the preset ratio according to the grid dispatching data to match and adjust the power generation of the power generation unit (300), When the power grid dispatch needs to increase the power generation of the power generation unit (300), the ethanol production is reduced by reducing the amount of synthesis gas allocated to the ethanol production unit (100); When the power generation of the power generation unit (300) needs to be reduced, the amount of synthesis gas entering the power generation unit (300) is reduced, the amount of synthesis gas distributed to the ethanol production unit (100) is increased, and the production of ethanol is increased.

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