Zero-carbon-emission low-rank-coal low-cost methanol production system
The low-rank coal-to-methanol system utilizes low-rank coal to generate gasified coke and raw coal gas, combined with CO2 capture and synthesis devices, to solve the problems of high cost and carbon emissions in traditional coal-to-methanol production, achieving low-cost and zero-carbon emission methanol production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-03-27
AI Technical Summary
Traditional coal-to-methanol processes require high-quality raw coal, have high production costs, and suffer from serious carbon emissions, resulting in low cost-effectiveness of methanol.
Using low-rank coal as raw material, a system consisting of a gasification coke generation unit, a raw coal gas treatment unit, an electrolysis water device, and a water-gas conversion device captures and utilizes CO2 in flue gas and effective gas to synthesize methanol, achieving zero carbon emissions and reducing costs throughout the entire process.
It reduced methanol production costs, enabled the complete conversion of carbon in low-rank coal into methanol, increased output, and achieved zero carbon emissions throughout the entire process.
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Figure CN224040900U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of methanol production, in particular to a zero carbon emission low cost methanol production system of low rank coal. BACKGROUND
[0002] China is a country with "rich coal, poor oil and little gas" energy structure, and methanol is a bridge for coal chemical industry to transform into petroleum chemical industry, an optimal carrier of hydrogen energy, a clean fuel energy, a basic chemical raw material and one of the key paths to alleviate the dependence on oil and gas imports.
[0003] Specifically, the production cost of traditional coal-to-methanol varies under the influence of coal price fluctuations and different production processes. Within the normal range of coal price fluctuations, the production cost of traditional coal-to-methanol in Xinjiang is about 1600-1800 yuan / t, the heat value of methanol is about 4650 kcal / kg, and the unit heat value cost is about 0.344-0.387 yuan / kkcal. The production cost of traditional coal-to-methanol in other regions is about 1800-2000 yuan / t, and the unit heat value production cost is about 0.387-0.43 yuan / kkcal. Through market research, methanol production enterprises have losses when the coal price rises significantly. Under the premise of not considering intermediate profits, special taxes and fees, and sales costs, the production cost of gasoline is about 3500 yuan / t, the heat value of gasoline is about 10490 kcal / kg, and the unit heat value production cost of gasoline is about 0.334 yuan / kkcal, which is lower than the production cost of traditional coal-to-methanol. Therefore, the unit heat value cost of methanol is higher than that of gasoline in the traditional coal-to-methanol production process, making methanol a less cost-effective clean energy. Moreover, there is a problem of carbon emissions in the current methanol production activities. UTILITY MODEL CONTENTS
[0004] The utility model solves the technical problem of providing a zero carbon emission low cost methanol production system of low rank coal that can use low rank coal as raw material to produce methanol.
[0005] To solve the above problems, the utility model provides a kind of zero carbon emission low rank coal low cost methanol production system, the zero carbon emission low rank coal low cost methanol production system includes the gasification coke generation unit using low rank coal to generate gasification coke while generating flue gas and raw coal gas, the raw coal gas treatment unit for converting raw coal gas into coke oil, hydrogen and LNG, electrolytic water device for absorbing green electricity to generate hydrogen and oxygen, the gasification device for converting gasification coke, steam and the oxygen generated by electrolytic water device into water gas, the water gas shift device for converting water gas into CO2, CO and hydrogen, the first CO2 capture device for capturing CO2 in active gas, the first methanol synthesis device for converting CO and hydrogen into methanol, the environmental protection treatment device for treating flue gas to reach environmental protection emission standard, the second CO2 capture device for capturing CO2 in flue gas, the CO2 storage device for storing CO2 captured by the first CO2 capture device and the second CO2 capture device, the second methanol synthesis device for synthesizing CO2 in CO2 storage device and hydrogen generated by raw coal gas treatment unit into methanol and the third methanol synthesis device for synthesizing CO2 in CO2 storage device and hydrogen generated by electrolytic water device into methanol.
[0006] Further, the gasification coke generation unit includes low-temperature dry distillation furnace for removing moisture of low rank coal, molding raw material batching device for configuring low rank coal and other raw materials after removing moisture according to predetermined ratio, modified molding machine for pressing molding raw material into type ball, drying device for drying type ball and high-temperature dry distillation furnace for dry distillation type ball into gasification coke while generating flue gas and raw coal gas.
[0007] Further, it further includes flue gas heat exchanger for transferring heat of high-temperature flue gas to air, and hot air formed after heating by flue gas heat exchanger is sent into drying device.
[0008] Further, the raw coal gas treatment unit includes raw coal gas purification separation device for converting raw coal gas into coal tar and hydrogen-rich coal gas and cryogenic adsorption separation device for converting hydrogen-rich coal gas into LNG and hydrogen.
[0009] Further, the gasification coke generation unit further includes coal gas combustion device for generating high-temperature flue gas for recycling use of low-temperature dry distillation furnace, and hydrogen-rich coal gas generated by raw coal gas purification separation device is also sent into high-temperature dry distillation furnace for heating and into coal gas combustion device.
[0010] To solve the above problems, the utility model also provides a kind of zero carbon emission low rank coal low cost methanol production system, a kind of zero carbon emission low rank coal low cost methanol production system including the gasification coke generation unit using low rank coal to generate gasification coke while producing flue gas and raw coal gas, for converting raw coal gas into coke coal oil, hydrogen and LNG raw coal gas processing unit, electrolytic water device for absorbing green electricity to generate hydrogen and oxygen, for converting gasification coke, steam and electrolytic water device generated oxygen into water gas gasification device, for converting water gas into CO2, CO and hydrogen effective gas water gas shift device, for capturing CO2 in the first CO2 capture device in effective gas, for converting CO and hydrogen into methanol the first methanol synthesis device, for treating flue gas to reach environmental protection emission standard environmental protection treatment device, for capturing CO2 in the second CO2 capture device in flue gas, for storing CO2 captured by the first CO2 capture device and the second CO2 capture device CO2 storage device, for synthesizing CO2 in CO2 storage device, hydrogen generated by raw coal gas processing unit and hydrogen generated by electrolytic water device into methanol the second methanol synthesis device.
[0011] Further, the gasification coke generation unit includes a low-temperature dry distillation furnace for removing moisture from low-rank coal, a molding material preparation device for configuring low-rank coal and other raw materials after removing moisture in a predetermined ratio, a modified molding machine for pressing the molding material into a molding ball, a drying device for drying the molding ball, and a high-temperature dry distillation furnace for dry distillation of the molding ball into gasification coke while generating flue gas and raw coal gas.
[0012] Further, it further includes a flue gas heat exchanger for transferring heat from high-temperature flue gas to air, and hot air formed after heating by the flue gas heat exchanger is sent to the drying device.
[0013] Further, the raw coal gas processing unit includes a raw coal gas purification and separation device for converting raw coal gas into coal tar and hydrogen-rich coal gas, and a cryogenic adsorption separation device for converting hydrogen-rich coal gas into LNG and hydrogen.
[0014] Further, the gasification coke generation unit further includes a coal gas combustion device for generating high-temperature flue gas for recycling by the low-temperature dry distillation furnace, and the hydrogen-rich coal gas generated by the raw coal gas purification and separation device is also sent to the high-temperature dry distillation furnace for heating and to the coal gas combustion device.
[0015] The gasification coke generating unit in the zero-carbon emission low-rank coal low-cost methanol production system can generate gasification coke by using low-rank coal, so that the methanol production raw material can adopt low-rank coal, thereby reducing the raw material cost, meanwhile, high-quality coal tar and LNG products are fully collected before gasification, thereby further offsetting the cost, meanwhile, CO2 in flue gas and CO2 in effective gas are all captured for synthesizing methanol, so that C in low-rank coal is all converted into methanol, thereby further improving the yield and reducing the cost, and zero-carbon emission in the whole process is realized. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 is a structure schematic view of a preferred embodiment of the zero-carbon emission low-rank coal low-cost methanol production system.
[0017] Figure 2 is a structure schematic view of the gasification coke generating unit.
[0018] Figure 3 is a structure schematic view of another preferred embodiment of the zero-carbon emission low-rank coal low-cost methanol production system.
[0019] The meanings of the reference numbers in the drawings are as follows:
[0020] The gasification coke generating unit 1, the low-temperature dry distillation furnace 11, the batching device 12, the modification molding machine 13, the drying device 14, the high-temperature dry distillation furnace 15, the flue gas heat exchanger 16, the coal gas combustion device 17, the raw coal gas treatment unit 2, the raw coal gas purification separation device 21, the deep cooling adsorption separation device 22, the gasification device 3, the water gas shift device 4, the first CO2 capture device 51, the second CO2 capture device 52, the first methanol synthesis device 61, the second methanol synthesis device 62, the third methanol synthesis device 63, the environmental protection treatment device 7, the CO2 storage device 8, and the electrolytic water device 9. DETAILED DESCRIPTION
[0021] The utility model will be further described in connection with the drawings.
[0022] Example one
[0023] For example, Figure 1 and Figure 2The preferred embodiment of the zero-carbon emission low-rank coal low-cost methanol production system shown in the utility model includes a gasification coke generating unit 1, a raw coal gas processing unit 2, a gasification device 3, a water gas shift device 4, a first CO2 capture device 51, a first methanol synthesis device 61, an environmental protection treatment device 7, a second CO2 capture device 52, a CO2 storage device 8, a second methanol synthesis device 62, a third methanol synthesis device 63, and an electrolytic water device 9. The gasification coke generating unit 1 is used to convert low-rank coal into gasification coke, which is fed into the gasification device 3. The gasification coke generating unit 1 simultaneously produces flue gas and raw coal gas, the flue gas is fed into the environmental protection treatment device 7, and the raw coal gas is fed into the raw coal gas processing unit 2. The raw coal gas processing unit 2 is used to convert the raw coal gas into hydrogen and coal tar, wherein the hydrogen is fed into the second methanol synthesis device 62, and the coal tar can be sold or further processed. The gasification device 3 is used to convert the gasification coke, steam, and oxygen into water gas, which is fed into the water gas shift device 4. The water gas shift device 4 is used to convert the water gas and steam into effective gas of CO2, CO, and hydrogen, which is fed into the first CO2 capture device 51. The first CO2 capture device 51 is used to capture CO2 in the effective gas, i.e., to separate CO2 from CO and hydrogen, the captured CO2 is fed into the CO2 storage device 8, and the remaining CO and hydrogen in the effective gas are fed into the first methanol synthesis device 61. The first methanol synthesis device 61 synthesizes methanol using the remaining CO and hydrogen. The environmental protection treatment device 7 is used to treat the flue gas to meet environmental protection emission standards, and the flue gas after the environmental protection treatment device 7 is fed into the second CO2 capture device 52. The second CO2 capture device 52 captures CO2 in the flue gas and feeds it into the CO2 storage device 8, while the remaining flue gas is discharged. The CO2 storage device 8 feeds the stored CO2 into the second methanol synthesis device 62 and the third methanol synthesis device 63. The electrolytic water device 9 uses green electricity to decompose water into oxygen and hydrogen, wherein the oxygen is fed into the gasification device 3, and the hydrogen is fed into the third methanol synthesis device 63. The second methanol synthesis device 62 is used to convert CO2 and hydrogen into methanol, and the second methanol synthesis device 62 converts the CO2 sent from the CO2 storage device 8 and the hydrogen sent from the raw coal gas processing unit 2 into methanol. The third methanol synthesis device 63 is used to convert CO2 and hydrogen into methanol, and the third methanol synthesis device 63 converts the CO2 sent from the CO2 storage device 8 and the hydrogen sent from the electrolytic water device 9 into methanol. The first CO2 capture device 51 and the second CO2 capture device 52 usually use absorbent method, membrane separation method, physical adsorption method, chemical adsorption method, pressure swing adsorption method, and low-temperature fractionation method to capture CO2, and the appropriate CO2 capture method can be selected according to the requirements.
[0024] The gasification coke generating unit 1 can generate gasification coke from low-rank coal raw materials, without selecting clean coal, lump coal and other coal types, so that the raw material cost is greatly reduced. The gasification coke generating unit 1 is used for dry distillation of formed coke, which is then sent to the gasification device 3 for gasification, so that the carbon content entering the gasification device 3 is greatly increased, thereby improving the gasification efficiency and effective gas yield, and further improving the methanol yield; CO2 in the water gas is captured by the first CO2 capture device 51 and sent to the CO2 storage device 8 for storage, and CO2 in the flue gas is captured by the second CO2 capture device 52 and sent to the CO2 storage device 8 for storage, at the same time, all CO2 in the flue gas and mixed gas is captured, a part of the CO2 is used to synthesize green methanol with hydrogen generated by the electrolytic water device 9, and a part of the CO2 is used to synthesize blue methanol with hydrogen generated by the raw coal gas treatment unit 2, so as to ensure that all C in low-rank coal can be converted into methanol, thereby improving the methanol yield, and at the same time, achieving zero carbon emission. The production cost is reduced while the methanol yield is improved.
[0025] The gasification coke generating unit 1 includes a low-temperature dry distillation furnace 11, a batching device 12, a modification molding machine 13, a drying device 14, a high-temperature dry distillation furnace 15, a flue gas heat exchanger 16 and a coal gas combustion device 17. The low-temperature dry distillation furnace 11 is used for removing water in low-rank coal, and the low-rank coal becomes upgraded raw coal after removing water. The low-temperature dry distillation furnace 11 simultaneously generates raw coal gas, which is sent to the raw coal gas treatment unit 2. The batching device 12 is used for preparing press molding raw materials by proportioning the upgraded raw coal and other raw materials. The modification molding machine 13 is used for pressing the press molding raw materials into type balls. The modification molding machine is a conventional device, so its specific structure and working principle are not described here. The drying device 14 is used for dehydrating the type balls. The high-temperature dry distillation furnace 15 is used for dry distillation of the type balls into type carbon, and simultaneously generates raw coal gas and high-temperature flue gas. The raw coal gas is sent to the raw coal gas treatment unit 2. The high-temperature dry distillation furnace 15 is also connected with the flue gas heat exchanger 16, and the high-temperature flue gas is sent to the flue gas heat exchanger 16. The flue gas heat exchanger 16 is used for transferring heat of the high-temperature flue gas to air to form high-temperature air. The heat-exchanged flue gas is sent to the environmental protection treatment device 7, and the high-temperature air is sent to the drying device 14 for drying type coal. The coal gas combustion device 17 is used for burning coal gas to generate high-temperature flue gas, which is sent to the low-temperature dry distillation furnace 11 for recycling. It should be understood that the coal gas combustion device 17 needs to be started only when high-temperature flue gas needs to be supplemented.
[0026] The raw coal gas treatment unit 2 includes a raw coal gas purification and separation device 21 and a cryogenic adsorption separation device 22. The raw coal gas purification and separation device 21 converts the raw coal gas into coal tar and hydrogen-rich gas. The coal tar can be sold or further processed, while the hydrogen-rich gas is fed into the cryogenic adsorption separation device 22. The cryogenic adsorption separation device 22 converts the hydrogen-rich gas into LNG and hydrogen. The LNG can be sold, while the hydrogen is fed into the second methanol synthesis unit 62. The hydrogen-rich gas generated by the raw coal gas purification and separation device 21 is also fed into a gas combustion device 17 and a high-temperature dry distillation furnace 15 for use.
[0027] Low-rank coal is upgraded in a low-temperature dry distillation furnace 11, and then dry distilled into gasified coke in a high-temperature dry distillation furnace 15. The gasification device 3 converts the gasified coke and oxygen generated by the water electrolysis device 9 into water gas. The gas conversion device then converts the water gas and steam into effective gas of CO2, CO and hydrogen. The effective gas passes through the first CO2 capture device 51, where CO2 is captured and sent to the CO2 storage device 8. The remaining CO and hydrogen are sent to the first methanol synthesis device 61 to synthesize methanol. At the same time, the flue gas generated by the high-temperature dry distillation furnace 15 is sent to the environmental protection treatment device 7 after heat exchange to meet environmental emission requirements. Then, it passes through the second CO2 capture device to capture CO2 in the flue gas and sends the captured CO2 to the CO2 storage device 8. The second methanol synthesis device 62 synthesizes methanol from the CO2 from the CO2 storage device and the hydrogen generated by cryogenic adsorption separation. The third methanol synthesis device 63 synthesizes methanol from the CO2 from the CO2 storage device and the hydrogen generated by the water electrolysis device 9. A CO2 storage device 8 is installed to stably supply CO2 to the second methanol synthesis unit 62 and the third methanol synthesis unit 63. Both CO2 in the flue gas and CO2 in the effective gas are captured and used to generate methanol, ensuring that all C in the low-rank coal is converted into methanol, resulting in high conversion efficiency. Using low-rank coal as raw material, the production cost of methanol using this invention is 350-500 yuan / t, and the unit calorific value production cost is 0.075-0.11 yuan / kkcal. Compared with existing methanol production costs, this significantly reduces costs, achieving low-cost coal-to-methanol production and effectively eliminating the negative impact of large fluctuations in methanol production costs caused by coal price volatility.
[0028] Example 2
[0029] like Figure 3 As shown, the difference between this embodiment and Embodiment 1 is that the CO2 storage device 8 is connected to only one second methanol synthesis device 62. At this time, the hydrogen produced by the cryogenic adsorption separation device 22 and the hydrogen produced by the water electrolysis device 9 are both sent to the second methanol synthesis device 62.
[0030] The above is only the implementation manner of the present utility model, and does not limit the patent range of the present utility model, and any equivalent structure, direct or indirect application in other related technical fields by using the content of the present utility model specification and drawings are also within the patent protection range of the present utility model.
Claims
1. A zero-carbon emission, low-rank coal, low-cost methanol production system, characterized in that: The system includes a coke generation unit that uses low-rank coal to produce coke while simultaneously generating flue gas and raw coal gas; a raw coal gas treatment unit that converts raw coal gas into tar oil, hydrogen, and LNG; an electrolysis water device that utilizes green electricity to generate hydrogen and oxygen; a gasification device that converts coke, steam, and oxygen generated by the electrolysis water device into water gas; a water gas conversion device that converts water gas into effective gases of CO2, CO, and hydrogen; a first CO2 capture device for capturing CO2 in the effective gases; a first methanol synthesis device for converting CO and hydrogen into methanol; an environmental treatment device for treating flue gas to meet environmental emission standards; a second CO2 capture device for capturing CO2 in the flue gas; a CO2 storage device for storing the CO2 captured by the first and second CO2 capture devices; a second methanol synthesis device for synthesizing methanol from CO2 in the CO2 storage device and hydrogen generated by the raw coal gas treatment unit; and a third methanol synthesis device for synthesizing methanol from CO2 in the CO2 storage device and hydrogen generated by the electrolysis water device.
2. The zero-carbon emission, low-rank coal, low-cost methanol production system as described in claim 1, characterized in that: The gasification coke generating unit includes a low-temperature dry distillation furnace for removing moisture from low-rank coal, a raw material feeding device for configuring the low-rank coal and other raw materials after moisture removal according to a predetermined ratio, a modified forming machine for pressing the raw materials into shaped balls, a drying device for drying the shaped balls, and a high-temperature dry distillation furnace for dry distilling the shaped balls into gasification coke while generating flue gas and raw coal gas.
3. The zero-carbon emission, low-rank coal, low-cost methanol production system as described in claim 2, characterized in that: It also includes a flue gas heat exchanger for transferring the heat of high-temperature flue gas to air, and the hot air formed after being heated by the flue gas heat exchanger is sent into the drying device.
4. The zero-carbon emission, low-rank coal, low-cost methanol production system as described in claim 2, characterized in that: The raw coal gas treatment unit includes a raw coal gas purification and separation device for converting raw coal gas into coal tar and hydrogen-rich coal gas, and a cryogenic adsorption and separation device for converting hydrogen-rich coal gas into LNG and hydrogen.
5. The zero-carbon emission, low-rank coal, low-cost methanol production system as described in claim 4, characterized in that: The gasification coke generation unit also includes a gas combustion device for generating high-temperature flue gas for circulation in a low-temperature dry distillation furnace. The hydrogen-rich gas generated by the raw coal gas purification and separation device is also fed into the high-temperature dry distillation furnace for heating and into the gas combustion device.
6. A zero-carbon emission, low-rank coal, low-cost methanol production system, characterized in that: The system includes a coke generation unit that uses low-rank coal to produce coke while simultaneously generating flue gas and raw coal gas; a raw coal gas treatment unit that converts raw coal gas into tar oil, hydrogen, and LNG; an electrolysis water device that utilizes green electricity to generate hydrogen and oxygen; a gasification device that converts coke, steam, and oxygen generated by the electrolysis water device into water gas; a water gas conversion device that converts water gas into effective gases of CO2, CO, and hydrogen; a first CO2 capture device for capturing CO2 in the effective gases; a first methanol synthesis device for converting CO and hydrogen into methanol; an environmental treatment device for treating flue gas to meet environmental emission standards; a second CO2 capture device for capturing CO2 in the flue gas; a CO2 storage device for storing the CO2 captured by the first and second CO2 capture devices; and a second methanol synthesis device for synthesizing methanol from the CO2 in the CO2 storage device, hydrogen generated by the raw coal gas treatment unit, and hydrogen generated by the electrolysis water device.
7. The zero-carbon emission, low-rank coal, low-cost methanol production system as described in claim 6, characterized in that: The gasification coke generating unit includes a low-temperature dry distillation furnace for removing moisture from low-rank coal, a raw material feeding device for configuring the low-rank coal and other raw materials after moisture removal according to a predetermined ratio, a modified forming machine for pressing the raw materials into shaped balls, a drying device for drying the shaped balls, and a high-temperature dry distillation furnace for dry distilling the shaped balls into gasification coke while generating flue gas and raw coal gas.
8. The zero-carbon emission, low-rank coal, low-cost methanol production system as described in claim 7, characterized in that: It also includes a flue gas heat exchanger for transferring the heat of high-temperature flue gas to air, and the hot air formed after being heated by the flue gas heat exchanger is sent into the drying device.
9. The zero-carbon emission, low-rank coal, low-cost methanol production system as described in claim 7, characterized in that: The raw coal gas treatment unit includes a raw coal gas purification and separation device for converting raw coal gas into coal tar and hydrogen-rich coal gas, and a cryogenic adsorption and separation device for converting hydrogen-rich coal gas into LNG and hydrogen.
10. The zero-carbon emission, low-rank coal, low-cost methanol production system as described in claim 9, characterized in that: The gasification coke generation unit also includes a gas combustion device for generating high-temperature flue gas for circulation in a low-temperature dry distillation furnace. The hydrogen-rich gas generated by the raw coal gas purification and separation device is also fed into the high-temperature dry distillation furnace for heating and into the gas combustion device.