Biomass charcoal gas co-production system for reducing steel smelting carbon emission

Abstract

The utility model discloses a biomass charcoal gas co-production system for reducing carbon emission in steel smelting, which belongs to the technical field of biomass preparation and comprises a carbonization device, a mixing device, a magnetizing device, a combustion chamber, a pretreatment system, a fermentation device and a steel smelting device. The produced combustible gas is conveyed to the combustion chamber to obtain high-temperature flue gas, and the high-temperature flue gas is conveyed to the magnetizing device; part of the powdery biochar is conveyed to a steel smelting device to replace coal, and part of the powdery biochar and a magnetizing agent are fully mixed and conveyed to a magnetizing device to generate magnetized charcoal and combustible gas with high-temperature flue gas in the magnetizing device; the magnetized carbon is conveyed to the pretreatment system to be fully mixed with biomass for fermentation and then conveyed to the fermentation device to obtain biogas, and the biogas is conveyed to the steel smelting device. According to the utility model, prepared biological natural gas and biological carbon are used as a heat source and a reducing agent, so that the influence on the steel smelting process is small, and the carbon emission in the steel smelting process can be effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of biomass preparation technology, and in particular to a biomass cogeneration system for reducing carbon emissions from steel smelting. Background Technology

[0002] Currently, 70% of steel production comes from blast furnace smelting. Blast furnace ironmaking consumes a large amount of coal, whose main role in steelmaking is to provide heat and a reducing agent. The steel industry accounts for about 15% of total carbon emissions. With the peak carbon emission date approaching, reducing carbon emissions from steelmaking is imperative. Biomass has the potential to partially replace coal and possesses naturally zero-carbon properties. However, biomass has poor grindability and cannot be directly used in steelmaking. Therefore, converting biomass into "gas" and "charcoal" to overcome these problems has significant economic value. Utility Model Content

[0003] Technical problem to be solved: In view of the technical problem of using biomass to replace coal in the iron and steel smelting process, this utility model provides a biomass cogeneration system for reducing carbon emissions in iron and steel smelting. It uses the prepared clean biogas and biochar as heat source and reducing agent, which has little impact on the iron and steel smelting process and can effectively reduce carbon emissions in the iron and steel smelting process.

[0004] Technical solution: The present invention describes a biomass carbon gas cogeneration system for reducing carbon emissions from iron and steel smelting. The biomass carbon gas cogeneration system includes a carbonization device, a mixing device, a magnetization device, a combustion chamber, a pretreatment system, a fermentation device, and an iron and steel smelting device.

[0005] The carbonization device accepts biochar prepared from biomass raw materials, which is then cooled and ground to produce powdered biochar; the combustible gas produced by the carbonization device is transported to the combustion chamber for complete combustion to obtain high-temperature flue gas, which is then transported to the magnetization device.

[0006] Part of the powdered biochar prepared by the carbonization device is transported to the iron and steel smelting device to replace coal, and part of the powdered biochar is transported to the mixing device and fully mixed with the magnetizing agent injected into the mixing device and then transported to the magnetization device. The mixture and the high-temperature flue gas from the combustion chamber complete the magnetization reaction in the magnetization device to generate magnetized carbon and combustible gas. The combustible gas is transported to the combustion chamber for full combustion, and the magnetized carbon is transported to the pretreatment system and fully mixed with biomass for fermentation before being transported to the fermentation device for fermentation to obtain biogas. After compression and purification, the biogas is used to obtain biomethane, which is transported to the iron and steel smelting device as a heat source for combustion to generate heat.

[0007] Preferably, a carbon cooling device, a carbon bin, a grinding device, and a carbon powder tank are sequentially arranged between the carbonization device and the mixing device; the biochar produced by the carbonization device is cooled by the carbon cooling device and then stored in the carbon bin, and the biochar stored in the carbon bin is transported to the grinding device for pulverization and then transported to the carbon powder tank for storage.

[0008] Preferably, the charcoal cooling device cools the biochar and heats the water to recover heat.

[0009] Preferably, a magnetized carbon cooling device is provided between the magnetization device and the pretreatment system, the magnetized carbon cooling device cooling the magnetized carbon and heating the water to recover heat.

[0010] Preferably, a flue gas cooler is connected to the flue gas duct of the carbonization device, and the flue gas is discharged after being cooled by the flue gas cooler;

[0011] The cooling water from the carbon cooling device and the magnetized carbon cooling device is heated by a flue gas cooler and transported to the fermentation device to undergo fermentation reaction with the pretreated biomass and magnetized carbon in the fermentation device.

[0012] Preferably, the flue gas generated by the magnetization device is transported to the carbonization device to heat the biomass raw material and cause a pyrolysis and carbonization reaction.

[0013] Preferably, a compression device and a purification device are connected to the pipeline between the fermentation device and the iron and steel smelting device, and the biogas produced by the fermentation device is processed by the compression device and the purification device to generate biomethane.

[0014] Preferably, the carbonization device employs indirect carbonization with the reaction temperature controlled at 350~450℃.

[0015] Preferably, the mixing device is a ribbon mixing device, which is equipped with a heating device and a magnetizing agent atomizing device.

[0016] Preferably, the magnetization device employs indirect heating and is made of a non-magnetic metal with a temperature resistance of not less than 900°C.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] This invention utilizes the prepared clean biogas and powdered biochar as heat sources and reducing agents, which has little impact on the iron and steel smelting process and can effectively reduce carbon emissions during the iron and steel smelting process. The prepared biochar has grindability that is basically the same as that of bituminous coal, and has good grindability, so it can be used to replace coal as a reducing agent. The use of magnetic carbon can significantly increase the methane yield per unit mass of raw material and increase the yield of biomass natural gas.

[0019] This invention also has other beneficial effects, which are described in the embodiments section of the specification and will not be repeated here. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure and flow of the carbon gas cogeneration system according to an embodiment of this utility model.

[0021] Reference numerals in the attached drawings: 1. Carbonization device; 2. Carbon cooling device; 3. Carbon silo; 4. Grinding device; 5. Carbon powder tank; 6. Mixing device; 7. Magnetization device; 8. Magnetized carbon cooling device; 9. Combustion chamber; 10. Smoke cooler; 11. Pretreatment system; 12. Fermentation device; 13. Compression device; 14. Purification device; 15. Iron and steel smelting device. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the accompanying drawings. Figure 1 The technical solutions of the embodiments of this utility model are clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0023] Example 1: As Figure 1 As shown, this utility model discloses a biomass carbon-gas cogeneration system for reducing carbon emissions from steel smelting. The biomass carbon-gas cogeneration system includes a carbonization device 1, a mixing device 6, a magnetization device 7, a combustion chamber 9, a pretreatment system 11, a fermentation device 12, and a steel smelting device 15.

[0024] Carbonization device 1 employs an indirect carbonization method with the reaction temperature controlled between 350 and 450°C. Carbonization device 1 receives biomass raw materials. The flue gas generated by magnetization device 7 is transported to carbonization device 1 to heat the biomass raw materials, causing a pyrolysis carbonization reaction to produce biochar. Between carbonization device 1 and mixing device 6, a carbon cooling device 2, a carbon bin 3, a grinding device 4, and a carbon powder tank 5 are sequentially arranged. The biochar produced by carbonization device 1 is cooled by carbon cooling device 2 and then stored in carbon bin 3. The biochar stored in carbon bin 3 is transported to grinding device 4 for pulverization and then transported to carbon powder tank 5 for storage. After cooling and grinding, powdered biochar is prepared. Part of the powdered biochar is transported to iron and steel smelting device 15 to replace coal as an energy source and reducing agent. The combustible gas produced by carbonization device 1 is transported to combustion chamber 9 for complete combustion, resulting in high-temperature flue gas, which is then transported to magnetization device 7 for a magnetization reaction. A flue gas cooler 10 is connected to the flue gas pipeline of carbonization device 1, and the flue gas is cooled by the flue gas cooler 10 before being discharged.

[0025] A portion of the powdered biochar prepared by carbonization device 1 is transported to mixing device 6 and thoroughly mixed with the magnetizing agent injected into mixing device 6 before being transported to magnetization device 7. The mixture undergoes a magnetization reaction with the high-temperature flue gas from combustion chamber 9 within magnetization device 7, generating magnetized carbon and combustible gas. The combustible gas is transported to combustion chamber 9 for complete combustion. The magnetized carbon is transported to pretreatment system 11 and thoroughly mixed with biomass for fermentation before being transported to fermentation device 12 for fermentation to obtain biogas. A compression device 13 and a purification device 14 are connected to the pipeline between fermentation device 12 and steel smelting device 15. The biogas produced by fermentation device 12 is processed by compression device 13 and purification device 14 to generate biomethane. After compression and purification, the biomethane is transported to steel smelting device 15 as a heat source for combustion to generate heat.

[0026] In a preferred embodiment, a carbon cooling device 2 located at the rear end of the carbonization device 1 cools the biochar with cooling water and heats the cooling water to recover heat. A magnetized carbon cooling device 8 is located between the magnetization device 7 and the pretreatment system 11. The magnetized carbon cooling device 8 cools the magnetized carbon and heats the incoming cooling water to recover heat. The cooling water from the carbon cooling device 2 and the magnetized carbon cooling device 8 is delivered to the flue gas cooler 10. The flue gas flowing through the flue gas cooler 10 heats the cooling water and is then delivered to the fermentation device 12 to ferment with the biomass and magnetized carbon treated by the pretreatment system 11.

[0027] In a preferred embodiment, the mixing device 6 is a ribbon mixing device 6, which is equipped with a heating device and a magnetizing agent atomizing device. After the powdered biochar enters the mixing device 6, it is fully mixed with the magnetizing agent sprayed by the magnetizing agent atomizing device through the ribbon mixing device 6, and then transported to the magnetizing device 7 for subsequent processing.

[0028] In a preferred embodiment, the magnetization device 7 employs indirect heating and is made of a non-magnetic metal with a temperature resistance of not less than 900°C.

[0029] The above are preferred embodiments of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A biomass cogeneration system for reducing carbon emissions from steel smelting, characterized in that, The biomass carbon gas cogeneration system includes a carbonization unit (1), a mixing unit (6), a magnetization unit (7), a combustion chamber (9), a pretreatment system (11), a fermentation unit (12), and an iron and steel smelting unit (15). The carbonization device (1) accepts biochar prepared from biomass raw materials, cools and grinds it to prepare powdered biochar; the combustible gas produced by the carbonization device (1) is transported to the combustion chamber (9) for complete combustion to obtain high-temperature flue gas, which is then transported to the magnetization device (7). The carbonization device (1) prepares a portion of the powdered biochar, which is then transported to the iron and steel smelting device (15) to replace coal. The powdered biochar is also transported to the mixing device (6) and fully mixed with the magnetizing agent injected into the mixing device (6), which is then transported to the magnetization device (7). The mixture and the high-temperature flue gas from the combustion chamber (9) undergo a magnetization reaction in the magnetization device (7) to generate magnetized carbon and combustible gas. The combustible gas is then transported to the combustion chamber (9) for full combustion. The magnetized carbon is then transported to the pretreatment system (11) and fully mixed with the biomass used for fermentation before being transported to the fermentation device (12) for fermentation to obtain biogas. After compression and purification, the biogas is used to obtain biomethane, which is then transported to the iron and steel smelting device (15) as a heat source to generate heat through combustion.

2. The biomass cogeneration system for reducing carbon emissions from iron and steel smelting according to claim 1, characterized in that, A carbon cooling device (2), a carbon bin (3), a grinding device (4), and a carbon powder tank (5) are sequentially arranged between the carbonization device (1) and the mixing device (6). The biochar produced by the carbonization device (1) is cooled by the carbon cooling device (2) and then stored in the carbon bin (3). The biochar stored in the carbon bin (3) is transported to the grinding device (4) for pulverization and then transported to the carbon powder tank (5) for storage.

3. The biomass cogeneration system for reducing carbon emissions from iron and steel smelting according to claim 2, characterized in that, The charcoal cooling device (2) cools the biochar and heats the water to recover heat.

4. The biomass cogeneration system for reducing carbon emissions from iron and steel smelting according to claim 3, characterized in that, A magnetized carbon cooling device (8) is provided between the magnetization device (7) and the pretreatment system (11). The magnetized carbon cooling device (8) cools the magnetized carbon and heats the water to recover heat.

5. The biomass cogeneration system for reducing carbon emissions from iron and steel smelting according to claim 4, characterized in that, A flue gas cooler (10) is connected to the flue gas duct of the carbonization device (1), and the flue gas is discharged after being cooled by the flue gas cooler (10); The cooling water from the carbon cooling device (2) and the magnetized carbon cooling device (8) is heated by the flue gas cooler (10) and transported to the fermentation device (12) to ferment with the biomass and magnetized carbon treated by the pretreatment system (11) in the fermentation device (12).

6. The biomass cogeneration system for reducing carbon emissions from iron and steel smelting according to claim 1, characterized in that, The flue gas generated by the magnetization device (7) is transported to the carbonization device (1) to heat the biomass raw material and cause a pyrolysis and carbonization reaction.

7. The biomass cogeneration system for reducing carbon emissions from iron and steel smelting according to claim 1, characterized in that, A compression device (13) and a purification device (14) are connected to the pipeline between the fermentation device (12) and the iron and steel smelting device (15). The biogas produced by the fermentation device (12) is processed by the compression device (13) and the purification device (14) to generate biogas.

8. The biomass cogeneration system for reducing carbon emissions from iron and steel smelting according to any one of claims 1 to 7, characterized in that, The carbonization device (1) adopts indirect carbonization with the reaction temperature controlled at 350~450℃.

9. The biomass cogeneration system for reducing carbon emissions from iron and steel smelting according to claim 8, characterized in that, The mixing device (6) is a ribbon mixing device (6), which is equipped with a heating device and a magnetizing agent atomizing device.

10. The biomass cogeneration system for reducing carbon emissions from iron and steel smelting according to claim 8, characterized in that, The magnetization device (7) employs indirect heating and is made of a non-magnetic metal with a temperature resistance of not less than 900°C.

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