Coking process capable of producing rich hydrogen and suitable for low-carbon metallurgy

Abstract

The present invention relates to a coking process capable of producing rich hydrogen and suitable for low-carbon metallurgy, which process comprises: 1) by means of coal blending and coking processes, obtaining high-temperature raw gas while producing coke by using a coke oven; 2) after cooling the coke by means of dry quenching, recovering heat to produce high-temperature superheated steam; 3) directly subjecting the high-temperature raw gas, without being cooled, to non-catalytic oxidative reforming under the action of oxygen, so as to obtain a high-temperature hydrogen-rich reducing gas; 4) cooling the high-temperature hydrogen-rich reducing gas by means of a waste heat boiler to obtain high-temperature superheated steam, and purifying the hydrogen-rich reducing gas, so as to obtain chemical byproducts; and 5) after the high-temperature superheated steam in steps (2) and (4) is combined with the grid, performing power generation using waste heat, so as to obtain electric energy. A coke product produced in the present invention meets requirements of a hydrogen-rich blast furnace; moreover, the byproduct, i.e., the high-temperature raw gas, is used for preparing the low-carbon low-cost hydrogen-rich reducing gas, thereby optimizing the whole process flow of coking; and therefore low-carbon hydrogen is obtained while coke is produced in an energy-saving and consumption-reducing manner, and carbon emissions in the whole coking production process are reduced.

Description

A hydrogen-rich coking process suitable for low-carbon metallurgy Technical Field

[0001] The invention belongs to the field of coking, and in particular relates to a hydrogen-rich coking process suitable for low-carbon metallurgy. Background Art

[0002] Coke is a key product in the traditional metallurgical industry. During coking, a certain amount of coke oven gas (COG) is produced. In the traditional coking process, various coking coals are blended and then converted into coke through dry distillation within the coke oven. The coke oven gas, a byproduct, escapes from the top of the coke oven as high-temperature raw gas. The coke is cooled and cooled by the dry quenching process, which simultaneously recovers heat to produce high-temperature superheated steam for power generation. The high-temperature raw gas is purified and converted into clean coke oven gas while recovering chemical products through a gas purification unit. Clean coke oven gas contains a certain amount of hydrogen, which is typically extracted using pressure swing adsorption (PSA).

[0003] After cooling, the coke enters the blast furnace and is mixed with iron ore. Smelting in the blast furnace produces pig iron and blast furnace gas, while impurities in the iron ore are discharged as blast furnace slag. Blast furnace gas is typically used to heat coke ovens or directly burn for power generation. The coke oven gas produced is purified to produce a small amount of chemical byproducts (tar, sulfur or sulfuric acid, sulfur ammonia or concentrated ammonia water, and crude benzene). This clean coke oven gas is then burned to generate electricity. Throughout the coking and metallurgical process, electricity generated through the combustion of clean coke oven gas, blast furnace gas, and waste heat from dry coke quenching is centrally allocated and supplied to power facilities within the plant. While the traditional coking and metallurgical process boasts maturity, stability, and economic benefits, it also produces high carbon emissions. Furthermore, coke oven gas contains a significant amount of hydrogen, making direct combustion for power generation inefficient.

[0004] The metallurgical coking industry is currently facing immense pressure to reduce carbon emissions, leading to the widespread adoption of low-carbon metallurgical processes such as hydrogen-enriched blast furnaces and gas-based shaft furnaces. While hydrogen-enriched blast furnaces use less coke, they still require coke as a supporting framework for iron ore. The increased heat absorption from hydrogen in the reduction reaction lowers furnace temperatures, impacting the coke gasification reaction. Therefore, coke used in hydrogen-enriched blast furnaces must possess both high strength and high reactivity.

[0005] Furthermore, hydrogen can be used as a reducing agent to reduce carbon dioxide, making it an even more essential component of the entire chemical industry. Currently, my country's primary source of hydrogen is coal, which is energy-intensive and emits high carbon emissions. Producing low-carbon, hydrogen-rich gas at low cost and on a large scale is an urgent challenge.

[0006] Summary of the Invention

[0007] The purpose of the present invention is to provide a hydrogen-rich coking process suitable for low-carbon metallurgy. The coke products produced can meet the needs of hydrogen-rich blast furnaces. The by-product high-temperature raw coal gas is used to prepare low-carbon and low-cost hydrogen-rich reducing gas, thereby optimizing the entire coking process. While producing coke with energy conservation and consumption reduction, low-carbon hydrogen is obtained, thereby reducing carbon emissions from the entire coking production process.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A hydrogen-rich coking process suitable for low-carbon metallurgy comprises the following steps:

[0010] 1) Through coal blending and coking processes, the coke oven can produce high-temperature raw coal gas while producing coke.

[0011] 2) After the coke is cooled by dry quenching, the heat is recovered to produce high-temperature superheated steam.

[0012] 3) The high-temperature raw coal gas is not cooled, but directly undergoes non-catalytic oxidation reforming under the action of oxygen to obtain high-temperature hydrogen-rich reducing gas.

[0013] 4) After the high-temperature hydrogen-rich reducing gas is cooled by the waste heat boiler, high-temperature superheated steam of the same quality as in step 2) is obtained. The hydrogen-rich reducing gas is purified to obtain chemical by-products (such as sulfur or sulfuric acid).

[0014] 5) After the high-temperature superheated steam in steps 2) and 4) is connected to the grid, waste heat power generation is performed to obtain electrical energy.

[0015] Alternatively, after the high-temperature superheated steam in steps 2) and 4) is connected to the grid, high-temperature steam electrolysis can be directly used to generate hydrogen, thereby increasing hydrogen production. The oxygen generated by electrolysis is returned to the high-temperature raw gas reforming process for oxygen supply.

[0016] Preferably, in step 4), the purified hydrogen-rich reducing gas is subjected to a hydrogen extraction process to obtain a hydrogen product and hydrogen-extracted fuel gas. The hydrogen-extracted fuel gas can be sold as fuel gas or returned to the coke oven for heating. Alternatively, the purified hydrogen-rich reducing gas can be directly used to produce bulk chemicals without undergoing a hydrogen extraction process.

[0017] Preferably, in the above step 4), the hydrogen-rich reducing gas after purification enters a hydrogen-rich blast furnace for producing pig iron; or enters a gas-based vertical furnace for producing sponge iron.

[0018] Preferably, the electricity obtained from waste heat power generation in the above step 5) is directly used for electrolysis of water or steam to generate hydrogen; at the same time, the oxygen obtained by electrolysis of hydrogen is returned to the high-temperature raw gas reforming for oxygen supply.

[0019] Preferably, the coke produced in step 1) is high-reactivity high-strength coke, which is cooled by dry quenching and then used as a reducing agent in a hydrogen-rich blast furnace together with the purified hydrogen-rich reducing gas. The reactivity CRI of the high-reactivity high-strength coke is 30% to 50%, and the cold strength M of the coke is 20%. 40 82% to 89%, cold strength M 10 It is 5% to 9%.

[0020] High-temperature raw gas is coke oven gas with a temperature above 550°C and has not been purified.

[0021] High-temperature hydrogen-rich reducing gas, with a temperature above 1200°C, is a reducing gas mainly composed of CO and H2.

[0022] The high-temperature superheated steam has a steam quality requirement of a temperature above 450°C and a pressure greater than or equal to 3.82 MPag; the waste heat boiler adopts a water tube boiler, and the cooling medium flows through the tube.

[0023] Non-catalytic oxidation reforming is the process of converting the high-temperature raw gas produced by the coke oven into a hydrogen-rich reducing gas mainly composed of hydrogen and carbon monoxide through non-catalytic oxidation technology without cooling it.

[0024] The volume content of H2 in the hydrogen-rich reducing gas is 50% to 70%, and the volume content of CO is 20% to 40%.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1) Optimize product applications: Convert all organic products in coke oven gas into hydrogen-rich reducing gas, increasing hydrogen production. High-temperature superheated steam recovered from waste heat can be directly electrolyzed to produce hydrogen. Alternatively, electricity generated from power generation can be used for electrolysis to produce hydrogen. Meanwhile, the oxygen produced as a byproduct of hydrogen production can be used to supply oxygen for non-catalytic oxidative reforming.

[0027] The coke oven of the present invention not only provides high-reactivity and high-strength coke required for hydrogen metallurgy, but also converts the gaseous product into hydrogen-rich reducing gas required for the hydrogen metallurgical process, thereby avoiding the use of a large amount of hydrogen for combustion and power generation.

[0028] 2) Optimizing Energy Consumption: Direct reforming of high-temperature raw gas eliminates the need for purification after rapid cooling. This fully utilizes the raw gas's inherent heat, maximizing the advantages of non-catalytic oxidation without the need for purification, saving oxygen and energy. Furthermore, waste heat recovery generates high-temperature superheated steam for power generation, which is then directly used for hydrogen electrolysis, avoiding grid-connected energy losses. High-temperature superheated steam can also be directly electrolyzed to increase hydrogen production.

[0029] 3) Optimize the temperature system: Direct reforming of high-temperature raw gas optimizes energy utilization efficiency, eliminating the need for repeated cooling and heating in the purification process. At the same time, it shortens the purification process, reduces primary investment and production operation energy consumption.

[0030] 4) Optimize wastewater treatment: Direct reforming of high-temperature raw coal gas increases the output of hydrogen-rich reducing gas. Tar and crude benzene are reformed into reducing gas before water washing, eliminating the need for phenol-cyanide treatment of wastewater.

[0031] 5) Optimize the waste heat recovery network: After the dry quenching and waste heat boiler recover heat, high-temperature superheated steam of the same specifications is produced. This can be used to directly produce hydrogen through electrolysis, or it can be connected to the grid for unified power generation. The generated electricity is directly used for electrolysis to produce hydrogen.

[0032] 6) Energy saving and carbon reduction: Optimizing processes to reduce energy consumption will reduce carbon emissions from the entire industrial process and reduce carbon emissions from the entire coking process.

[0033] 7) The product has a wide range of applications: In addition to producing high-strength and highly reactive coke suitable for hydrogen metallurgical processes, the hydrogen-rich reducing gas can be directly used as a reducing agent in hydrogen metallurgy, as synthesis gas for the synthesis of bulk chemicals, and can also be directly used to extract hydrogen for application in the new energy field;

[0034] 8) Reasonable gas phase composition: The hydrogen-rich reducing gas produced has a hydrogen-to-carbon ratio close to 2, making it more suitable for producing bulk chemical commodities when used as syngas. In contrast, the hydrogen content of raw coke oven gas is relatively low, but its proportion is relatively high. Excess hydrogen requires additional processing equipment.

[0035] 9) Saving space: Direct reforming of high-temperature raw gas saves repeated heating and cooling in the process flow, reduces purification equipment, and achieves the purpose of saving industrial equipment space while reducing primary investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] FIG1 is a flow chart of a hydrogen-rich coking process adapted to low-carbon metallurgy according to the present invention (Example 1).

[0037] FIG2 is a flow chart of a hydrogen-rich coking process adapted to low-carbon metallurgy according to the present invention (Example 2).

[0038] FIG3 is a flow chart of a hydrogen-rich coking process adapted to low-carbon metallurgy according to the present invention (Example 3).

[0039] FIG4 is a flow chart of a hydrogen-rich coking process adapted to low-carbon metallurgy according to the present invention (Example 4). DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below in conjunction with specific embodiments, but this should not be construed as limiting the scope of the present invention to the following examples. Without departing from the above technical concept of the present invention, various substitutions or modifications made according to common technical knowledge and commonly used technical means in the field should be included within the scope of the present invention.

[0041] Example 1:

[0042] As shown in Figure 1, a hydrogen-rich coking process suitable for low-carbon metallurgy consists of coal blending, coke oven, dry quenching, non-catalytic oxidation reforming, waste heat boiler, waste heat power generation, purification, and electrolytic hydrogen production. Specifically, it includes the following steps:

[0043] 1) Through coal blending and coking processes, the coke oven produces high-temperature raw gas while producing coke. The coke oven produces high-temperature raw gas by dry distilling the coking coal, completing the coking process.

[0044] 2) After the coke is cooled by CDQ, the heat is recovered to produce high-temperature superheated steam. The coke is cooled by nitrogen or other inert gases, and the waste heat is recovered to produce high-temperature superheated steam.

[0045] 3) The high-temperature raw coal gas is not cooled, but directly undergoes non-catalytic oxidation reforming under the action of oxygen to obtain high-temperature hydrogen-rich reducing gas.

[0046] Non-catalytic oxidation reforming is the process of converting the high-temperature raw gas produced by the coke oven into a hydrogen-rich reducing gas mainly composed of hydrogen and carbon monoxide through non-catalytic oxidation technology without cooling it.

[0047] 4) The high-temperature hydrogen-rich reducing gas is passed through a waste heat boiler for waste heat recovery to obtain high-temperature superheated steam of the same quality as in step 2), and the hydrogen-rich reducing gas is purified to obtain chemical by-products (such as sulfur or sulfuric acid).

[0048] After purification, the hydrogen-rich reducing gas undergoes a hydrogen extraction process to produce hydrogen product and hydrogen-extracted fuel gas. The hydrogen-extracted fuel gas can be sold as fuel gas or returned to the coke oven for heating. Independent coking companies can also use the purified hydrogen-rich reducing gas directly to produce bulk chemical products (such as formaldehyde and methanol) without going through the hydrogen extraction process.

[0049] After purification, the hydrogen-rich reducing gas can be used to provide hydrogen for new energy industry applications, or it can be directly used as synthesis gas to produce methanol or other bulk chemicals.

[0050] 5) The high-temperature superheated steam produced by the dry quenching of coke and the waste heat boiler in steps 2) and 4) is connected to the grid and then used for waste heat power generation to obtain electric energy.

[0051] The electricity obtained from waste heat power generation is directly used for electrolysis of water or steam, and the generated hydrogen is sold together with the hydrogen obtained in step 4) as a product; at the same time, the oxygen obtained by electrolysis of hydrogen is returned to the high-temperature raw coal gas reforming for oxygen supply.

[0052] In this embodiment, high-temperature raw gas refers to unpurified coke oven gas with a temperature above 550°C. High-temperature hydrogen-rich reducing gas is a reducing gas primarily composed of CO and H2, with a temperature above 1200°C. The H2 content of the hydrogen-rich reducing gas is approximately 55-60% by volume, and the CO content is approximately 27-33% by volume. High-temperature superheated steam, which can be used for waste heat power generation, typically has a temperature of 540°C and a pressure of 10 MPa.

[0053] In this embodiment, the high-temperature raw coal gas produced is directly reformed through non-catalytic oxidation to produce hydrogen-rich reducing gas without undergoing rapid cooling. Simultaneously, optimizing the waste heat and energy recovery system and the utilization of electrical energy can further increase hydrogen production capacity while increasing the utilization of byproduct oxygen, further reducing carbon emissions and saving energy.

[0054] Example 2:

[0055] As shown in Figure 2, a hydrogen-rich coking process suitable for low-carbon metallurgy consists of coal blending, coke oven, dry quenching, non-catalytic oxidation reforming, waste heat boiler, purification, and high-temperature steam electrolysis. Specifically, it includes the following steps:

[0056] 1) Through coal blending and coking processes, the coke oven produces high-temperature raw gas while producing coke. The coke oven produces high-temperature raw gas by dry distilling the coking coal, completing the coking process.

[0057] 2) After the coke is cooled by CDQ, the heat is recovered to produce high-temperature superheated steam. The coke is cooled by nitrogen or other inert gases, and the waste heat is recovered to produce high-temperature superheated steam.

[0058] 3) The high-temperature raw coal gas is not cooled, but directly undergoes non-catalytic oxidation reforming under the action of oxygen to obtain high-temperature hydrogen-rich reducing gas.

[0059] Non-catalytic oxidation reforming is the process of converting the high-temperature raw gas produced by the coke oven into a hydrogen-rich reducing gas mainly composed of hydrogen and carbon monoxide through non-catalytic oxidation technology without cooling it.

[0060] 4) The high-temperature hydrogen-rich reducing gas is passed through a waste heat boiler for waste heat recovery to obtain high-temperature superheated steam of the same quality as in step 2), and the hydrogen-rich reducing gas is purified to obtain chemical by-products (such as sulfur or sulfuric acid).

[0061] After purification, the hydrogen-rich reducing gas undergoes a hydrogen extraction process to produce hydrogen product and hydrogen-extracted fuel gas. The hydrogen-extracted fuel gas can be sold as fuel gas or returned to the coke oven for heating. Independent coking companies can also use the purified hydrogen-rich reducing gas directly to produce bulk chemical products (such as formaldehyde and methanol) without going through the hydrogen extraction process.

[0062] After purification, the hydrogen-rich reducing gas can be used to provide hydrogen for new energy industry applications, or it can be directly used as synthesis gas to produce methanol or other bulk chemicals.

[0063] 5) After the high-temperature superheated steam generated by the dry coke quenching and waste heat boiler in steps 2) and 4) is connected to the grid, it is directly electrolyzed to produce hydrogen, thereby increasing hydrogen production. The resulting hydrogen is sold together with the hydrogen obtained in step 4) as a product; the oxygen obtained from the electrolysis is returned to the high-temperature raw gas reforming process for oxygen supply.

[0064] In this embodiment, high-temperature raw gas refers to unpurified coke oven gas with a temperature above 550°C. High-temperature hydrogen-rich reducing gas is a reducing gas primarily composed of CO and H2, with a temperature above 1100°C. The H2 content of the hydrogen-rich reducing gas is approximately 58-63% by volume, and the CO content is approximately 27-30% by volume. High-temperature superheated steam, which can be used for waste heat power generation, typically has a temperature of 500°C and a pressure of 8 MPa.

[0065] The hydrogen-rich coking process adapted to low-carbon metallurgy provided in Examples 1 and 2 achieves energy-saving optimization and low-carbon hydrogen supply by directly reforming high-temperature raw coal gas without cooling to obtain hydrogen-rich reducing gas, and coking, waste heat power generation, electrolysis to produce hydrogen (or high-temperature steam electrolysis), purification, and hydrogen extraction. By optimizing and integrating the overall coking process, low-carbon hydrogen is obtained while producing coke with energy conservation and consumption reduction. The carbon emissions of the entire coking production process are reduced, while providing low-carbon hydrogen, maintaining a stable supply of process scale, and maintaining good economic benefits.

[0066] Example 3:

[0067] As shown in Figure 3, a hydrogen-rich coking process suitable for low-carbon metallurgy consists of coal blending, coke oven, dry quenching, non-catalytic oxidation reforming, waste heat boiler, waste heat power generation, and purification, including the following steps:

[0068] 1) Through coal blending and coking processes, the coke oven produces high-reactivity and high-strength coke while obtaining high-temperature raw coal gas.

[0069] The coal blending process involves optimizing the blending of coking coal, fat coal, lean coal, and lean coal. Furthermore, inorganic salts such as Cao and MgO, as well as complex organic compounds in the coal series, such as medium-temperature pitch (binder), are added to the blended coal. This results in a coke product with a highly reactive surface and high internal strength. The highly reactive and high-strength coke has a CRI of 30% to 50%, a cold strength (M40) of 82% to 89%, and a cold strength (M10) of 5% to 9%.

[0070] 2) After the highly reactive and high-strength coke is cooled by dry quenching, the heat is recovered to produce high-temperature superheated steam.

[0071] The highly reactive and high-strength coke obtained from coke oven production is cooled by inert gases such as nitrogen, while waste heat is recovered to obtain high-temperature superheated steam.

[0072] 3) The high-temperature raw coal gas is not cooled, but directly undergoes non-catalytic oxidation reforming under the action of oxygen to obtain high-temperature hydrogen-rich reducing gas.

[0073] Non-catalytic oxidation reforming is the process of converting the high-temperature raw gas produced by the coke oven into a hydrogen-rich reducing gas mainly composed of hydrogen and carbon monoxide through non-catalytic oxidation technology without cooling it.

[0074] 4) After the high-temperature hydrogen-rich reducing gas is cooled by the waste heat boiler, high-temperature superheated steam of the same quality as in step 2) is obtained. The hydrogen-rich reducing gas is purified to remove the sulfur-containing components in the hydrogen-rich reducing gas to obtain chemical by-products (such as sulfur or sulfuric acid).

[0075] The hydrogen-rich reducing gas after purification enters the hydrogen-rich blast furnace for producing pig iron.

[0076] The high-reactivity and high-strength coke in step 2) is cooled by dry quenching and then used together with the purified hydrogen-rich reducing gas as a reducing agent in a hydrogen-rich blast furnace to produce pig iron.

[0077] 5) After the high-temperature superheated steam in steps 2) and 4) is connected to the grid, waste heat power generation is performed to obtain electrical energy.

[0078] In this embodiment, high-temperature raw gas refers to unpurified coke oven gas with a temperature above 550°C. High-temperature hydrogen-rich reducing gas is a reducing gas primarily composed of CO and H2, with a temperature above 1100°C. The H2 content of the hydrogen-rich reducing gas is approximately 60-65% by volume, and the CO content is approximately 27-28% by volume. High-temperature superheated steam, which can be used for waste heat power generation, typically has a temperature of 540°C and a pressure of 10 MPa.

[0079] Example 3 of the present invention produces highly reactive coke by adjusting coal blending and coke oven process, so that the cold strength and hot strength of the new coke are equivalent to those of traditional coke, and the reactivity is doubled, thereby meeting the high-strength and high-reactivity coke required for hydrogen-rich blast furnaces.

[0080] At the same time, the high-temperature raw coal gas produced undergoes non-catalytic oxidative reforming without cooling to produce hydrogen-rich reducing gas. After waste heat recovery and purification, the hydrogen-rich reducing gas is directly fed into the hydrogen-rich blast furnace, where it, along with highly reactive coke, provides a reducing agent for ironmaking. Through effective process optimization and integration, this maximizes waste energy recovery and optimizes the output of reducing products, achieving energy conservation and emission reduction while reducing the overall carbon emissions of the steel industry.

[0081] Example 4:

[0082] As shown in Figure 4, a hydrogen-rich coking process suitable for low-carbon metallurgy consists of coal blending, coke oven, dry quenching, non-catalytic oxidation reforming, waste heat boiler, waste heat power generation, and purification. Specifically, it includes the following steps:

[0083] 1) Through coal blending and coking processes, the coke oven produces high-reactivity and high-strength coke while obtaining high-temperature raw coal gas.

[0084] The coal blending process is to optimize the blending of coking coal, fat coal, lean coal and other coal sources, and add inorganic salts such as Cao and MgO and medium-temperature asphalt (binder) and other coal-based complex organic matter, so that the coke product produced by the coal fed into the furnace has high reactivity on the surface and high strength inside. The coke produced is high reactivity and high strength coke. The reactivity CRI of high reactivity and high strength coke is 30% to 50%, and the cold strength M of coke is 20%. 40 82% to 89%, cold strength M 10 It is 5% to 9%.

[0085] 2) Highly reactive and high-strength coke is cooled by dry quenching and sold as the final product; the recovered heat is used to produce high-temperature superheated steam.

[0086] The highly reactive and high-strength coke obtained from coke oven production is cooled by inert gases such as nitrogen, while waste heat is recovered to obtain high-temperature superheated steam.

[0087] 3) The high-temperature raw coal gas is not cooled, but directly undergoes non-catalytic oxidation reforming under the action of oxygen to obtain high-temperature hydrogen-rich reducing gas.

[0088] Non-catalytic oxidation reforming is the process of converting the high-temperature raw gas produced by the coke oven into a hydrogen-rich reducing gas mainly composed of hydrogen and carbon monoxide through non-catalytic oxidation technology without cooling it.

[0089] 4) After the high-temperature hydrogen-rich reducing gas is cooled by the waste heat boiler, high-temperature superheated steam of the same quality as in step 2) is obtained. The hydrogen-rich reducing gas is purified to remove the sulfur-containing components in the hydrogen-rich reducing gas to obtain chemical by-products (such as sulfur or sulfuric acid).

[0090] Low-carbon metallurgy adopts a gas-based vertical furnace process, and the hydrogen-rich reducing gas after purification enters the gas-based vertical furnace for the production of sponge iron.

[0091] 5) After the high-temperature superheated steam in steps 2) and 4) is connected to the grid, waste heat power generation is performed to obtain electrical energy.

[0092] In this embodiment, high-temperature raw gas refers to unpurified coke oven gas with a temperature above 550°C. High-temperature hydrogen-rich reducing gas, with a temperature above 1100°C, is a reducing gas primarily composed of CO and H₂. The H₂ content in the hydrogen-rich reducing gas is approximately 55-63% by volume, and the CO content is approximately 27-30% by volume. High-temperature superheated steam, which can be used for waste heat power generation, typically has a temperature of 540°C and a pressure of 10 MPa.

[0093] Example 4 provides a hydrogen-rich coking process suitable for low-carbon metallurgy. The coke products produced meet the needs of hydrogen-rich blast furnaces, and the by-product high-temperature raw coal gas is used to prepare low-carbon, low-cost hydrogen-rich reducing gas. The hydrogen-rich reducing gas can not only meet the demand of hydrogen-rich blast furnaces for hydrogen-rich gas, but can also be directly used as hydrogen-rich reducing gas in gas-based vertical furnaces to produce sponge iron. While reducing carbon emissions in the iron and steel metallurgy field, it integrates resource utilization efficiency and optimizes process flows. Under the premise of energy conservation and carbon reduction, it maintains a stable supply of process scale while maintaining good economic benefits.

[0094] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A hydrogen-rich coking process suitable for low-carbon metallurgy, characterized in that: The steps include: 1) Through coal blending and coking processes, the coke oven produces coke while obtaining high-temperature raw coal gas; 2) After the coke is cooled by dry quenching, the heat is recovered to produce high-temperature superheated steam; 3) The high-temperature raw coal gas is not cooled down, but directly subjected to non-catalytic oxidation reforming under the action of oxygen to obtain high-temperature hydrogen-rich reducing gas; 4) The high-temperature hydrogen-rich reducing gas is cooled by a waste heat boiler to obtain high-temperature superheated steam of the same quality as in step 2), and the hydrogen-rich reducing gas is purified to obtain chemical by-products; 5) After the high-temperature superheated steam in steps 2) and 4) is connected to the grid, waste heat is used to generate electricity to obtain electric energy; Alternatively, in steps 2) and 4), high-temperature superheated steam is directly electrolyzed to obtain hydrogen after being connected to the grid, and the oxygen obtained by electrolysis is returned to the high-temperature raw coal gas reforming for oxygen supply.

2. A coking process for producing hydrogen richly and adapting to low-carbon metallurgy according to claim 1, characterized in that: In the above step 4), the hydrogen-rich reducing gas after purification is used to obtain hydrogen products and hydrogen-extracted fuel gas through a hydrogen extraction process; or the hydrogen-rich reducing gas after purification is used to directly produce bulk chemicals without undergoing a hydrogen extraction process.

3. A coking process for producing hydrogen richly and adapting to low-carbon metallurgy according to claim 1, characterized in that: In the above step 4), the hydrogen-rich reducing gas after purification enters a hydrogen-rich blast furnace for producing pig iron; or enters a gas-based vertical furnace for producing sponge iron.

4. A hydrogen-rich coking process adapted to low-carbon metallurgy according to claim 1 or 2, characterized in that: The electric energy obtained by waste heat power generation in the above step 5) is used to electrolyze water or steam to generate hydrogen; at the same time, the oxygen obtained by electrolyzing hydrogen is returned to the high-temperature raw coal gas reforming for oxygen supply.

5. The hydrogen-rich coking process adapted to low-carbon metallurgy according to claim 1, characterized in that: The coke produced in the above step 1) is a high-reactivity high-strength coke. After the high-reactivity high-strength coke is cooled by dry quenching, it is used as a reducing agent in a hydrogen-rich blast furnace together with the purified hydrogen-rich reducing gas; the reactivity CRI of the high-reactivity high-strength coke is 30% to 50%, and the cold strength M of the coke is 40 82% to 89%, cold strength M 10 It is 5% to 9%.

6. A coking process for producing hydrogen richly and adapting to low-carbon metallurgy according to claim 1, characterized in that: The high-temperature raw coal gas is coke oven gas with a temperature above 550° C. and has not been purified.

7. The hydrogen-rich coking process adapted to low-carbon metallurgy according to claim 1, characterized in that: The high-temperature hydrogen-rich reducing gas has a temperature above 1200°C.

8. The hydrogen-rich coking process adapted to low-carbon metallurgy according to claim 1, characterized in that: The high-temperature superheated steam has a steam quality requirement of a temperature above 450°C and a pressure greater than or equal to 3.82Mpag; the waste heat boiler is a water tube boiler.

9. The hydrogen-rich coking process adapted to low-carbon metallurgy according to claim 1, characterized in that: The non-catalytic oxidation reforming is to convert the high-temperature raw coal gas produced by the coke oven into hydrogen-rich reducing gas through non-catalytic oxidation technology without cooling it down.

10. The hydrogen-rich coking process adapted to low-carbon metallurgy according to claim 1, characterized in that: The volume content of H2 in the hydrogen-rich reducing gas is 50% to 70%, and the volume content of CO is 20% to 40%.

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