Zero-carbon emission, low-rank coal hydrogen production steelmaking system
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-13
- Publication Date
- 2026-08-11
AI Technical Summary
[0003]但是目前炼钢厂氢气来源通常是采用电解水制氢或者外购，外购氢气运输储存成本高，且运输过程和存储的安全问题不容忽视，而电解水制氢虽然比外购便宜但其成本也相对较高，需要5度电才能得到1m3氢气，约2.5元才能得到1m3氢气，成本相对较高
[0015]This novel zero-carbon emission, low-rank coal hydrogen production steelmaking system first utilizes a gasification carbon generation unit to convert low-rank coal into gasified carbon while simultaneously discharging raw coal gas. Then, a gasification device converts the gasified carbon into water gas, followed by a water gas conversion device that converts the water gas into hydrogen. Simultaneously, a hydrogen production unit converts the raw coal gas produced by the gasification carbon generation unit into hydrogen. This system effectively utilizes low-rank coal to generate hydrogen for use in hydrogen steelmaking, while simultaneously reducing the cost of hydrogen production to approximately 0.5 yuan per cubic meter. 3 .
Smart Images
Figure CN224619954U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hydrogen steelmaking technology, and in particular to a zero-carbon emission, low-rank coal hydrogen-to-steelmaking system. Background Technology
[0002] Hydrogen metallurgy, which replaces coke with hydrogen, has the significant advantage of producing only water vapor during the reduction process and achieving near-zero carbon emissions.
[0003] However, steel mills currently typically source hydrogen either through water electrolysis or by purchasing it externally. Purchasing hydrogen incurs high transportation and storage costs, and safety issues during transportation and storage cannot be ignored. While water electrolysis is cheaper than purchasing, its cost is still relatively high, requiring 5 kWh of electricity to produce 1 m³ of hydrogen. 3 Hydrogen gas costs approximately 2.5 yuan to obtain 1 cubic meter. 3 Hydrogen gas is relatively expensive. Utility Model Content
[0004] The technical problem to be solved by this utility model is to provide a zero-carbon emission, low-cost hydrogen production steelmaking system for low-rank coal that can convert low-rank coal into hydrogen.
[0005] To address the aforementioned problems, this utility model provides a zero-carbon emission, low-rank coal, low-cost hydrogen-to-steelmaking system. This system includes a gasification carbon generation unit for converting low-rank coal into gasified carbon and raw coal gas; a hydrogen production unit for converting raw coal gas into hydrogen; a gasification device for converting gasified carbon into water gas; a water gas conversion device for converting water gas into hydrogen and carbon dioxide; a carbon dioxide collection device for collecting carbon dioxide; and a hydrogen steelmaking device using hydrogen as a reducing gas. The gasification carbon generation unit is connected to the hydrogen production unit via a pipeline. The gasification device is connected to the water gas conversion device via a pipeline. Both the water gas conversion device and the hydrogen production unit are connected to the hydrogen steelmaking device via pipelines. The water gas conversion device is also connected to the carbon dioxide collection device via another pipeline.
[0006] Furthermore, it also includes a methanol generating device for consuming carbon dioxide to generate methanol and an electrolytic water device for generating hydrogen and oxygen. The carbon dioxide collecting device is connected to the methanol generating device through a pipeline, the electrolytic water device is connected to the methanol generating device through a pipeline, and the electrolytic water device is also connected to the gasification device through another pipeline.
[0007] Furthermore, the gasification carbon generation unit includes a low-temperature dehydration device for removing moisture from low-rank coal to generate dehydrated coal, a medium-temperature anaerobic dry distillation device for removing volatile matter to generate upgraded coal, a mixing device for mixing liquefied heavy oil and upgraded coal to generate a mixture, a material cooling device for cooling the mixture, a hot pressing device for pressing the mixture into briquettes, and a high-temperature anaerobic dry distillation device for dry distilling the briquettes into gasification carbon. The medium-temperature anaerobic dry distillation device is connected to the mixing device via a sealed conveying device, the mixing device is connected to the cooling device via a sealed conveying device, and the medium-temperature anaerobic dry distillation device is also connected to a hydrogen production unit.
[0008] Furthermore, it also includes a liquefaction device for liquefying heavy oil substances, the liquefaction device being connected to the mixing device.
[0009] Furthermore, the liquefaction device is connected to a material cooling device.
[0010] Furthermore, it also includes a crushing device for breaking coal blocks into pulverized coal.
[0011] Furthermore, it also includes a first flue gas temperature regulating device. The high-temperature anaerobic dry distillation device sends flue gas into the first flue gas temperature regulating device through a pipeline to reduce the flue gas temperature. The first flue gas temperature regulating device sends the reduced flue gas into the medium-temperature anaerobic dry distillation device through a pipeline.
[0012] Furthermore, it also includes a second flue gas temperature regulating device and an environmental protection treatment device. The first flue gas temperature regulating device is a flue gas heat exchanger, which has a first medium inlet, a second medium inlet, a first medium outlet, and a second medium outlet. The high-temperature anaerobic dry distillation device is connected to the first medium inlet through a pipeline, and the first medium outlet is connected to the second flue gas temperature regulating device. The second flue gas temperature regulating device is used to heat the flue gas to increase its temperature. The low-temperature dehydration device is connected to the second medium inlet through a pipeline, and the second medium outlet is connected to the environmental protection device.
[0013] Furthermore, the medium-temperature anaerobic dry distillation apparatus is also connected to a low-temperature dehydration apparatus.
[0014] Furthermore, the hydrogen production unit includes a cooling drum device, a purification device, and a cryogenic adsorption separation device. The gasified carbon generation unit is connected to the cooling drum device via a pipeline, the cooling drum device is connected to the purification device via a pipeline, the purification device is connected to the cryogenic adsorption separation device via a pipeline, and the purification device is also connected to the gasified carbon generation unit via a pipeline.
[0015] This novel zero-carbon emission, low-rank coal hydrogen production steelmaking system first utilizes a gasification carbon generation unit to convert low-rank coal into gasified carbon while simultaneously discharging raw coal gas. Then, a gasification device converts the gasified carbon into water gas, followed by a water gas conversion device that converts the water gas into hydrogen. Simultaneously, a hydrogen production unit converts the raw coal gas produced by the gasification carbon generation unit into hydrogen. This system effectively utilizes low-rank coal to generate hydrogen for use in hydrogen steelmaking, while simultaneously reducing the cost of hydrogen production to approximately 0.5 yuan per cubic meter. 3 . Attached Figure Description
[0016] Figure 1 This is a schematic diagram of a preferred embodiment of the zero-carbon emission, low-rank coal hydrogen production and steelmaking system of this utility model.
[0017] Figure 2 This is a schematic diagram of the structure of the carbon gasification generation unit.
[0018] Figure 3 This is a schematic diagram of the hydrogen production unit.
[0019] The meanings of the labels in the attached diagram are as follows:
[0020] Gasification carbon generation unit 1, raw coal crushing device 10, low temperature dehydration device 11, medium temperature anaerobic dry distillation device 12, liquefaction device 13, material mixing device 14, material cooling device 15, hot pressing molding device 16, high temperature anaerobic dry distillation device 17, first flue gas temperature regulating device 181, second flue gas temperature regulating device 182, environmental protection treatment device 19, hydrogen production unit 2, cooling drum device 21, purification device 22, cryogenic adsorption separation device 23, gasification device 3, water-gas conversion device 4, carbon dioxide collection device 5, hydrogen steelmaking device 6, methanol generation device 7, water electrolysis device 8. Detailed Implementation
[0021] The present invention will be further described below with reference to the accompanying drawings.
[0022] like Figure 1As shown, a preferred embodiment of the zero-carbon emission, low-rank coal-to-hydrogen steelmaking system of this utility model includes a gasification carbon generation unit 1, a hydrogen production unit 2, a gasification device 3, a water-gas conversion device 4, a carbon dioxide collection device 5, a hydrogen steelmaking device 6, a methanol generation device 7, and a water electrolysis device 8. The gasification carbon generation unit 1 is used to produce gasification carbon from low-rank coal, while simultaneously emitting raw coal gas. The gasification carbon generation unit is connected to the hydrogen production unit 2, which sends the raw coal gas into the hydrogen production unit 2 through a pipeline. The hydrogen production unit 2 produces hydrogen from the raw coal gas. The hydrogen production unit 2 is connected to the hydrogen steelmaking device 6, which sends hydrogen into the hydrogen steelmaking device 6 through a pipeline. Simultaneously, the hydrogen production unit 2 is also connected to the gasification carbon unit through a pipeline, and the intermediate product, hydrogen-rich coal gas, is sent into the gasification carbon unit through a pipeline. The gasification unit 3 converts the gasified carbon and oxygen produced by the gasification carbon production unit into water gas. The gasification unit 3 is connected to the water gas conversion unit 4, and the gasification unit 3 sends the water gas into the water gas conversion unit 4 through a pipeline. The water gas conversion unit 4 converts the water gas into hydrogen and carbon dioxide. The water gas conversion unit 4 is connected to the hydrogen steelmaking unit 6 and the carbon dioxide collection unit 5 through two branch pipelines, respectively, to send the hydrogen generated by the water gas conversion unit 4 into the hydrogen steelmaking unit 6 and to send the high-concentration carbon dioxide generated by the water gas conversion unit 4 into the carbon dioxide collection unit 5. The carbon dioxide collection unit 5 is a storage tank used to store carbon dioxide. The carbon dioxide collection unit 5 is connected to the methanol generation unit 7 through a pipeline, and the carbon dioxide collection unit 5 supplies carbon dioxide to the methanol generation unit 7. The water electrolysis device 8 is used to generate hydrogen and oxygen. The water electrolysis device 8 can use green electricity. It is connected to both the methanol generation device 7 and the gasification device 3. The oxygen generated by the water electrolysis device 8 is piped to the gasification device 3, and the hydrogen generated by the water electrolysis device 8 is piped to the methanol generation device 7. The methanol generation device 7 synthesizes methanol from the carbon dioxide supplied by the carbon dioxide collection device 5 and the hydrogen supplied by the water electrolysis device 8. In other embodiments, the methanol generation device 7 and the water electrolysis device 8 may be omitted, and the carbon dioxide collected by the carbon dioxide collection device 5 can be sold.
[0023] like Figure 2As shown, the gasification carbon generation unit 1 includes a pulverizing device, a low-temperature dehydration device 11, a medium-temperature anaerobic dry distillation device 12, a liquefaction device 13, a material mixing device 14, a material cooling device 15, a hot pressing and forming device 16, a high-temperature anaerobic dry distillation device 17, a first flue gas temperature regulating device 181, a second flue gas temperature regulating device 182, and an environmental protection treatment device 19. The pulverizing device is used to pulverize low-rank raw coal into pulverized coal. The low-temperature dehydration device 11 is used to heat the pulverized coal by directly or indirectly contacting the low-rank coal with flue gas to remove moisture, thereby generating dehydrated coal. The medium-temperature anaerobic dry distillation device 12 is used to perform low-temperature dry distillation on the dehydrated coal to precipitate the volatiles of the dehydrated coal, i.e., to precipitate raw coal gas, thereby obtaining upgraded coal. The liquefaction device 13 is used to liquefy heavy oil substances, such as oil residue or other liquefiable heavy oil substances. The medium-temperature anaerobic dry distillation unit 12 is connected to the material mixing unit 14 via a sealed conveying device. This allows the upgraded coal to be kept warm, eliminating the need for repeated heating and saving energy. It also isolates oxygen to prevent the upgraded coal from undergoing quality changes. The material mixing unit 14 mixes liquefied heavy oil with the upgraded coal to form a mixture. During the mixing process, raw coal gas is further released. The liquefied heavy oil is in a liquid state, which helps to better mix the heavy oil with the upgraded coal. The material mixing unit 14 is connected to the material cooling unit 15 via a sealed conveying device. This allows the mixture to be kept warm, eliminating the need for repeated heating and saving energy. It also isolates oxygen to prevent the mixture from undergoing quality changes. The sealed conveying device typically uses a screw conveyor. The hot-pressing forming unit 16 presses the mixture into briquettes. The liquefied heavy oil acts as a binder, binding the upgraded coal and ensuring the mixture can be pressed into shape. The medium-temperature anaerobic dry distillation unit 12 is connected to the hydrogen production unit 2, and the raw coal gas produced by the medium-temperature anaerobic dry distillation unit 12 is fed into the hydrogen production unit 2. The liquefaction device 13 is connected to the material cooling device 15. Specifically, the liquefaction device 13 has a first heat exchange medium outlet and a first heat exchange medium inlet, and the material cooling device 15 has a second heat exchange medium outlet and a second heat exchange medium inlet. The first heat exchange medium outlet is connected to the second heat exchange medium inlet through a pipe, and the second heat exchange medium outlet is connected to the first heat exchange medium inlet through a pipe. The heat exchange medium absorbs heat in the material cooling device 15 to lower the temperature of the mixture. During this period, the temperature of the heat exchange medium rises. After absorbing heat, the heat exchange medium enters the liquefaction device 13 and is further heated to heat the heavy oil material. After the heat exchange medium heats the heavy oil material, its temperature decreases, and it can then be sent to the material cooling device 15 for cooling. The heat exchange medium is recycled, which can reduce energy consumption. The heat exchange medium is usually heat transfer oil to improve heat exchange efficiency.The high-temperature anaerobic dry distillation device 17 dry distills coal briquettes into gasified carbon. The high-temperature anaerobic dry distillation device 17 is connected to the hydrogen production unit 2 so that the raw coal gas generated by the high-temperature anaerobic dry distillation device 17 is sent to the hydrogen production unit 2. The high-temperature anaerobic dry distillation device 17 is also connected to a first flue gas temperature regulating device 181, which is a flue gas heat exchanger 182. The flue gas heat exchanger 182 has a first medium inlet, a second medium inlet, a first medium outlet, and a second medium outlet. The high-temperature anaerobic dry distillation device 17 is connected to the first medium inlet via a pipeline, and the first medium outlet is connected to the second flue gas temperature regulating device 182. The second flue gas temperature regulating device 182 is used to heat the flue gas to increase its temperature. The second flue gas temperature regulating device 182 is connected to the medium-temperature anaerobic dry distillation device 12 to send the heated flue gas into the medium-temperature anaerobic dry distillation device 12 as a heat source for the medium-temperature anaerobic dry distillation device 12. The medium-temperature anaerobic dry distillation device 12 is connected to the low-temperature dehydration device 11 to send the discharged flue gas into the low-temperature dehydration device 11 for dehydration. The low-temperature dehydration device 11 is connected to the second medium inlet via a pipeline, and the second medium outlet is connected to an environmental protection device. The flue gas discharged from the low-temperature dehydration unit 11 is heated by the flue gas heat exchanger 182, thus eliminating the need for reheating during the environmental treatment process in the environmental treatment unit 19, saving energy. The flue gas discharged from the high-temperature anaerobic dry distillation unit 17 is introduced into the medium-temperature anaerobic dry distillation unit 12 for use. After use in the medium-temperature anaerobic dry distillation unit 12, the flue gas is discharged and introduced into the low-temperature dehydration anaerobic dry distillation unit for continued use. This maximizes the utilization of the thermal energy of the flue gas discharged from the high-temperature anaerobic dry distillation unit 17, saving flue gas consumption and thus saving energy for heating the flue gas.
[0024] like Figure 3 As shown, the hydrogen production unit 2 includes a cooling drum device 21, a purification device 22, and a cryogenic adsorption separation device 23. The high-temperature anaerobic distillation device 17 and the medium-temperature anaerobic distillation device 12 are both connected to the cooling drum device 21. The raw coal gas discharged from the high-temperature anaerobic distillation device 17 and the medium-temperature anaerobic distillation device 12 is fed into the cooling drum device 21, which is used to remove coal tar from the raw coal gas. The purification device 22 is connected to the cooling drum device 21 and is used to purify impurities in the raw coal gas to obtain hydrogen-rich coal gas. The purification device 22 is connected to the cryogenic adsorption separation device 23. The purification device 22 is also connected via pipeline to a second flue gas temperature regulating device 182 and the high-temperature anaerobic distillation device 17, so that the hydrogen-rich coal gas is fed into the high-temperature anaerobic distillation device 17 for use as a cooling gas and combustion gas, and into the second flue gas temperature regulating device 182 for use as a combustion gas to heat the flue gas. The cryogenic adsorption separation device 23 is used to convert hydrogen-rich coal gas into hydrogen and LNG. The cryogenic adsorption separation device 23 is connected to the hydrogen steelmaking device 6, and sends hydrogen into the hydrogen steelmaking device 6 for steelmaking.
[0025] In operation, the low-rank raw coal is first crushed into pulverized coal using a crushing device. The pulverized coal is then fed into a low-temperature dehydration device 11 for dehydration, resulting in dehydrated coal. The dehydrated coal is then fed into a medium-temperature anaerobic dry distillation device 12 for dry distillation to obtain upgraded coal. The upgraded coal is then fed into a material mixing device 14 via a sealed conveying device to be mixed with liquefied heavy oil to obtain a mixture. The mixture is then fed into a material cooling device 15 via a sealed conveying device. The cooled mixture is then fed into a hot pressing molding device 16 to be pressed into briquettes. The briquettes are then fed into a high-temperature anaerobic dry distillation device 17 for dry distillation to obtain gasified carbon. The gasified carbon is converted into water gas via a gasification device 3. The water gas is then converted into hydrogen and high-concentration carbon dioxide via a water gas conversion device 4. The hydrogen is then fed into a hydrogen steelmaking device 6 for steelmaking. Simultaneously, the raw coal gas produced by the medium-temperature anaerobic dry distillation device 12 and the high-temperature anaerobic dry distillation device 17 is fed into a hydrogen production unit 2 for hydrogen production. The resulting hydrogen is also fed into the steelmaking device for steelmaking. The system can utilize low-rank coal to produce hydrogen, which is then fed into the hydrogen steelmaking unit 6 for steelmaking. The hydrogen produced through this system can reduce the cost of hydrogen production to approximately 0.5 yuan per cubic meter. 3 Using hydrogen in steelmaking can effectively reduce carbon emissions from steel production.
[0026] At the same time, the methanol generation unit 7 converts the carbon dioxide generated by the water-gas conversion unit into methanol, which can avoid carbon dioxide emissions and achieve zero carbon emissions in the production process.
[0027] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structure made using the contents of this utility model specification and drawings, whether directly or indirectly applied to other related technical fields, shall also be within the patent protection scope of this utility model.
Claims
1. A zero-carbon emission, low-rank coal hydrogen production and steelmaking system, characterized in that: The system includes a carbon gasification unit for converting low-rank coal into carbon gasification and raw coal gas, a hydrogen production unit for converting raw coal gas into hydrogen, a gasification device for converting carbon gasification into water gas, a water gas conversion device for converting water gas into hydrogen and carbon dioxide, a carbon dioxide collection device for collecting carbon dioxide, and a hydrogen steelmaking device for steelmaking using hydrogen as a reducing gas. The carbon gasification unit is connected to the hydrogen production unit via a pipeline, the gasification device is connected to the water gas conversion device via a pipeline, the water gas conversion device and the hydrogen production unit are both connected to the hydrogen steelmaking device via pipelines, and the water gas conversion device is also connected to the carbon dioxide collection device via another pipeline.
2. The zero-carbon emission, low-rank coal hydrogen production and steelmaking system as described in claim 1, characterized in that: It also includes a methanol generating device for consuming carbon dioxide to generate methanol and an electrolytic water device for generating hydrogen and oxygen. The carbon dioxide collecting device is connected to the methanol generating device via a pipeline, the electrolytic water device is connected to the methanol generating device via a pipeline, and the electrolytic water device is also connected to the gasification device via another pipeline.
3. The zero-carbon emission, low-rank coal hydrogen production and steelmaking system as described in claim 1, characterized in that: The gasification carbon generation unit includes a low-temperature dehydration device for removing moisture from low-rank coal to generate dehydrated coal, a medium-temperature anaerobic dry distillation device for removing volatile matter to generate upgraded coal, a mixing device for mixing liquefied heavy oil and upgraded coal to generate a mixture, a material cooling device for cooling the mixture, a hot pressing device for pressing the mixture into briquettes, and a high-temperature anaerobic dry distillation device for dry distilling the briquettes into gasification carbon. The medium-temperature anaerobic dry distillation device is connected to the mixing device via a sealed conveying device, the mixing device is connected to the cooling device via a sealed conveying device, and the medium-temperature anaerobic dry distillation device is also connected to a hydrogen production unit.
4. The zero-carbon emission, low-rank coal hydrogen production and steelmaking system as described in claim 3, characterized in that: It also includes a liquefaction device for liquefying heavy oil substances, the liquefaction device being connected to the mixing device.
5. The zero-carbon emission, low-rank coal hydrogen production and steelmaking system as described in claim 4, characterized in that: The liquefaction device is connected to the material cooling device.
6. The zero-carbon emission, low-rank coal hydrogen production and steelmaking system as described in claim 3, characterized in that: It also includes crushing devices for breaking coal blocks into pulverized coal.
7. The zero-carbon emission, low-rank coal hydrogen production and steelmaking system as described in claim 3, characterized in that: It also includes a first flue gas temperature regulating device, wherein the high-temperature anaerobic dry distillation device sends flue gas into the first flue gas temperature regulating device through a pipeline to reduce the flue gas temperature, and the first flue gas temperature regulating device sends the reduced flue gas into the medium-temperature anaerobic dry distillation device through a pipeline.
8. The zero-carbon emission, low-rank coal hydrogen production and steelmaking system as described in claim 7, characterized in that: It also includes a second flue gas temperature regulating device and an environmental protection treatment device. The first flue gas temperature regulating device is a flue gas heat exchanger, which has a first medium inlet, a second medium inlet, a first medium outlet, and a second medium outlet. The high-temperature anaerobic dry distillation device is connected to the first medium inlet through a pipeline, and the first medium outlet is connected to the second flue gas temperature regulating device. The second flue gas temperature regulating device is used to heat the flue gas to increase its temperature. The low-temperature dehydration device is connected to the second medium inlet through a pipeline, and the second medium outlet is connected to the environmental protection device.
9. The zero-carbon emission, low-rank coal hydrogen production and steelmaking system as described in claim 3, characterized in that: The medium-temperature anaerobic dry distillation apparatus is also connected to a low-temperature dehydration apparatus.
10. The zero-carbon emission, low-rank coal hydrogen production and steelmaking system as described in claim 1, characterized in that: The hydrogen production unit includes a cooling drum device, a purification device, and a cryogenic adsorption separation device. The carbon gasification generation unit is connected to the cooling drum device via a pipeline. The cooling drum device is connected to the purification device via a pipeline. The purification device is connected to the cryogenic adsorption separation device via a pipeline. The purification device is also connected to the carbon gasification generation unit via a pipeline.