Heating system and method for hydrogen metallurgy hydrogen-rich reducing gas

Abstract

The invention relates to the technical field of metallurgy, and particularly discloses a hydrogen-rich reducing gas heating system and method for hydrogen metallurgy. Comprising a reduction shaft furnace system, a high-temperature heating furnace, a combustion gas preheating furnace, a reduction gas preheating furnace, an emptying system, a hydrogen supply system and an air combustion-supporting system, the reduction shaft furnace system, the high-temperature heating furnace, the combustion gas preheating furnace, the reduction gas preheating furnace and the emptying system are connected in sequence; the reduction shaft furnace system is respectively connected with the combustion gas preheating furnace and the reduction gas preheating furnace; the hydrogen supply system is respectively connected with the combustion gas preheating furnace and the reducing gas preheating furnace; and the air combustion-supporting system is connected with the combustion gas preheating furnace. According to the reducing gas preheating furnace, the reducing gas is preheated and secondarily heated, so that the temperature of the reducing gas entering the reducing gas preheating furnace is higher, the preheating efficiency is greatly improved, heat can be fully recycled, and the energy utilization rate is high.

Description

Technical Field

[0001] The present invention relates to the technical field of metallurgy, and more particularly to a system and method for heating hydrogen-rich reducing gas for hydrogen metallurgy. Background Art

[0002] Currently, the mainstream steel production process in my country uses coke and iron ore to produce molten iron in a blast furnace, which is then smelted into steel in a converter. This process, known as the long steelmaking process, produces high carbon (CO2) emissions, accounting for over 90% of the total steelmaking process. Hydrometallurgy technology uses hydrogen to replace carbon (coke, reducing coal, etc.) to reduce the iron oxide in iron ore, reducing carbon emissions from the long steelmaking process and offering a key CO2 reduction strategy for the steel industry.

[0003] Compared with traditional blast furnace smelting, the direct reduction ironmaking process has the technical advantages of short process, no need for coking coal, and obvious energy saving and emission reduction effects. It is an important development direction for achieving low-carbon green smelting; and the gas-based vertical furnace method is the mainstream direct reduction ironmaking technology in the world today.

[0004] Most gas-based shaft furnace processes currently in operation use natural gas as their feedstock. In recent years, research has begun in China into processes using coke oven gas as a feedstock. However, whether using natural gas, coke oven gas, or coal-to-gas as a source, shaft furnace direct reduction processes essentially still use carbon-based feedstock as a source, reforming and converting it into reducing gases such as carbon monoxide and hydrogen, thus failing to completely avoid carbon emissions.

[0005] With carbon emission reduction and carbon neutrality becoming common challenges for humanity, replacing carbon-based "grey hydrogen" with hydrogen produced from renewable energy ("green hydrogen"), or the all-hydrogen shaft furnace process, is the future direction of technological development. Currently, there are no existing examples of all-hydrogen shaft furnaces or heating systems that heat pure hydrogen to the required temperature.

[0006] Direct reduction in a vertical furnace for hydrogen metallurgy requires a reduction temperature of 850-1000°C, typically around 950°C. Lower temperatures result in longer reaction times and lower yields; higher temperatures cause pellets to stick together, making discharge difficult. Therefore, heating the hydrogen reduction gas for hydrogen metallurgy requires temperatures of 950-1000°C, placing high demands on the hydrogen reduction gas heating system. However, existing hydrogen-rich reduction gas heaters for hydrogen metallurgy have a short residence time in the heating tubes, resulting in poor heating performance. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a system and method for heating hydrogen-rich reducing gas for hydrogen metallurgy; The solution adopted by the present invention to solve the technical problem is: A hydrogen-rich reducing gas heating system for hydrogen metallurgy, comprising a reducing shaft furnace system, a high-temperature heating furnace, a combustion gas preheating furnace, a reducing gas preheating furnace, an exhaust system, a hydrogen supply system, and an air combustion-supporting system; The reduction shaft furnace system, high temperature heating furnace, combustion gas preheating furnace, reduction gas preheating furnace, and exhaust system are connected in sequence; the reduction shaft furnace system is connected to the combustion gas preheating furnace and the reduction gas preheating furnace respectively; The hydrogen supply system is connected to the combustion gas preheating furnace and the reducing gas preheating furnace respectively; The air combustion-supporting system is connected to the combustion gas preheating furnace.

[0008] In some possible embodiments, the reducing gas preheating furnace includes a reducing gas preheating furnace body connected to the combustion gas preheating furnace, a reducing gas pipe arranged in the reducing gas preheating furnace body, and a heating component arranged in the reducing gas preheating furnace body and used to heat the reducing gas pipe; one end of the reducing gas pipe is connected to the high-temperature heating furnace, and the other end of the reducing gas pipe is connected to the hydrogen supply system and the reducing vertical furnace system, respectively.

[0009] In some possible embodiments, the combustion gas preheating furnace includes a combustion furnace body connected to the high-temperature heating furnace and the reduction preheating furnace body respectively, a combustion gas pipe and an air pipe arranged in the combustion furnace body and respectively connected to the high-temperature heating furnace; the other end of the air pipe is connected to the air combustion system; the other end of the combustion gas pipe is connected to the hydrogen supply system and the reduction vertical furnace system respectively.

[0010] In some possible embodiments, the high-temperature heating furnace includes a furnace body connected to a combustion furnace body, a furnace pipe installed in the furnace body, one end of which is connected to a reduction shaft furnace system and the other end is connected to a reduction gas pipe, and an igniter installed on the furnace body and connected to a combustion gas pipe and an air pipe, respectively.

[0011] In some possible embodiments, the reduction shaft furnace system includes a shaft furnace body, a furnace top storage tank arranged on the shaft furnace body, and a cooling, dust removal, and filtering treatment system for cooling, dust removal, purification, and dehydration of the furnace top gas generated by the shaft furnace body to form circulating gas; the cooling, dust removal, and filtering treatment system are respectively connected to the shaft furnace body, the reduction gas pipe, and the combustion gas pipe; and the bottom of the shaft furnace body is externally connected to a direct reduced iron inerting device.

[0012] In some possible implementations, an output main pipe is provided at the outlet of the cooling, dust removal and filtering treatment system, a first branch pipe is provided between the output main pipe and the combustion gas pipe; a second branch pipe is provided between the output main pipe and the reduction gas pipe; A combustion gas mixing device connected to a hydrogen supply system is provided on the branch pipe 1; The second branch pipe is provided with a reducing gas mixing device connected to the hydrogen supply system.

[0013] In some possible implementations, a nitrogen supply system is further included, and the nitrogen supply system is respectively connected to the direct reduced iron inerting device, the cooling, dust removal and filtration treatment system, and the air combustion support system.

[0014] In some possible implementations, the exhaust system includes a jet chimney connected to the reduction preheating furnace body and an exhaust fan connected to the jet chimney; the heating component is an electric induction coil mounted on the outside of the reduction gas pipe.

[0015] A method for heating hydrogen-rich reducing gas for hydrogen metallurgy is based on the above-mentioned system for heating hydrogen-rich reducing gas for hydrogen metallurgy; specifically comprising the following steps: The top gas generated after reduction in the reduction shaft furnace system is cooled, dusted, purified and dehydrated to form circulating gas. Part of the circulating gas is mixed with hydrogen provided by the hydrogen supply system to form combustion gas which enters the combustion preheating furnace for preheating. The preheated combustion gas enters the high-temperature heating furnace. The other part of the circulating gas is mixed with the hydrogen provided by the hydrogen supply system to form reducing gas, which enters the reducing gas preheating furnace for preheating. The preheated reducing gas then enters the high-temperature heating furnace. Air enters the combustion preheating furnace through the air combustion system for preheating. The preheated air enters the high-temperature heating furnace and burns with the combustion gas to generate heated flue gas. The heated flue gas heats the reducing gas in the high-temperature heating furnace. The heated reducing gas enters the reduction shaft furnace system to reduce the oxidized pellets, and the heated flue gas is converted into high-temperature flue gas. The high-temperature flue gas enters the combustion gas preheating furnace to preheat the combustion gas and air. The preheated high-temperature flue gas is converted into medium-temperature flue gas and enters the reducing gas preheating furnace to cooperate with the heating component to preheat the reducing gas inside it; the preheated medium-temperature flue gas is converted into low-temperature flue gas and discharged under the drive of the exhaust system.

[0016] In some possible implementations, the temperature of the reducing gas heated by the heating flue gas formed by the combustion of the combustion gas and air in the high-temperature heating furnace is 900-1100° C. The temperature of the combustion gas and air in the combustion gas preheating furnace after being preheated by the high-temperature flue gas transported by the high-temperature heating furnace is 600-800°C; The temperature of the reducing gas in the reducing gas preheating furnace after being preheated by the medium-temperature flue gas and the heating component is 300-500°C; The temperature of the high-temperature flue gas is 1000-1100°C, the temperature of the medium-temperature flue gas is 400-600°C, and the temperature of the low-temperature flue gas is 150-250°C.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention can effectively heat the reducing gas entering the high-temperature heating furnace by arranging a reducing gas preheating furnace, and heat the combustion gas and air using the combustion gas preheating furnace; the preheating efficiency is greatly improved, heat can be fully recovered, and the energy utilization rate is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a flow chart of the present invention; in: 1. Reduction shaft furnace system; 11. Furnace top storage tank; 12. Cooling, dust removal and filtration treatment system; 2. High temperature heating furnace; 21. Furnace tube; 22. Ignition device; 3. Combustion gas preheating furnace; 30. Branch pipe 1; 31. Combustion gas pipe; 32. Air pipe; 4. Reducing gas preheating furnace; 40. Branch pipe 2; 41. Reducing gas pipe; 42. Heating assembly; 5. Empty the system; 6. Direct reduced iron inerting device; 7. Hydrogen supply system; 8. Nitrogen supply system; 9. Air combustion system. DETAILED DESCRIPTION

[0019] In this application, unless otherwise specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integration; they can refer to direct connections or indirect connections through an intermediary; they can refer to internal communication between two components or interactions between two components. The terms "first," "second," and similar terms mentioned in this application do not denote any order, quantity, or importance; they are simply used to distinguish between different components. Similarly, terms such as "one" or "a" do not indicate a quantitative limitation; rather, they indicate the presence of at least one. In the implementation of this application, "and / or" describes an association relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. In the description of the embodiments of this application, unless otherwise specified, "plurality" means two or more. For example, "plurality" refers to two or more positioning posts. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0020] The present invention is described in detail below.

[0021] like Figure 1 As shown, a hydrogen-rich reducing gas heating system for hydrogen metallurgy includes a reduction shaft furnace system 1, a high-temperature heating furnace 2, a combustion gas preheating furnace 3, a reducing gas preheating furnace 4, an exhaust system 5, a hydrogen supply system 7, and an air combustion-supporting system 9; The reduction shaft furnace system 1, the high-temperature heating furnace 2, the combustion gas preheating furnace 3, the reduction gas preheating furnace 4, and the emptying system 5 are connected in sequence; the reduction shaft furnace system 1 is connected to the combustion gas preheating furnace 3 and the reduction gas preheating furnace 4 respectively; The hydrogen supply system 7 is connected to the combustion gas preheating furnace 3 and the reducing gas preheating furnace 4 respectively; The air combustion-supporting system 9 is connected to the combustion gas preheating furnace 3 .

[0022] When in use, part of the circulating gas generated by the reduction shaft furnace system 1 is mixed with the hydrogen provided by the hydrogen supply system 7 to form reducing gas which enters the reduction preheating furnace for preheating and then enters the high-temperature heating furnace 2 for secondary heating. The remaining circulating gas generated by the reduction shaft furnace system 1 is mixed with the hydrogen provided by the hydrogen supply system 7 to form combustion gas, which enters the combustion gas preheating furnace 3 for preheating and is then transported to the high-temperature heating furnace 2. The air combustion-supporting system 9 delivers air to the combustion gas preheating furnace 3, where the air is preheated and delivered to the high-temperature heating furnace 2, where it is mixed with the combustion gas delivered to the high-temperature heating furnace 2 for combustion. The heated flue gas generated during combustion will secondary heat the reducing gas in the high-temperature heating furnace 2. The secondary heated reducing gas will enter the reduction shaft furnace system 1 to reduce the oxidized pellets. The reduced furnace top gas will then be cooled, dust-removed, purified, and dehydrated to form circulating gas. After the heating flue gas heats the reducing gas in the high-temperature heating furnace 2, the high-temperature flue gas generated is transported to the combustion gas preheating furnace 3. The high-temperature flue gas is used to preheat the combustion gas and air in the combustion gas preheating furnace 3. The temperature of the high-temperature flue gas after use is reduced and enters the reducing gas preheating furnace 4 as medium-temperature flue gas, and preheats the reducing gas inside the reducing gas preheating furnace 4. The temperature of the medium-temperature flue gas is reduced and discharged under the action of the exhaust system 5.

[0023] In some possible embodiments, the reducing gas preheating furnace 4 includes a reducing gas preheating furnace body connected to the combustion gas preheating furnace 3, a reducing gas pipe 41 arranged in the reducing gas preheating furnace body, and a heating component 42 arranged in the reducing gas preheating furnace body and used to heat the reducing gas pipe 41; one end of the reducing gas pipe 41 is connected to the high-temperature heating furnace 2, and the other end of the reducing gas pipe 41 is connected to the hydrogen supply system 7 and the reduction shaft furnace system 1, respectively.

[0024] In some possible embodiments, the combustion gas preheating furnace 3 includes a combustion furnace body respectively connected to the high-temperature heating furnace 2 and the reduction preheating furnace body, a combustion gas pipe 31 and an air pipe 32 arranged in the combustion furnace body and respectively connected to the high-temperature heating furnace 2; the other end of the air pipe 32 is connected to the air combustion system 9; the other end of the combustion gas pipe 31 is respectively connected to the hydrogen supply system 7 and the reduction shaft furnace system 1.

[0025] In some possible embodiments, the high-temperature heating furnace 2 includes a furnace body connected to the combustion furnace body, a furnace pipe 21 installed in the furnace body, one end of which is connected to the reduction shaft furnace system 1 and the other end is connected to the reduction gas pipe 41, and an igniter 22 installed on the furnace body and connected to the combustion gas pipe 31 and the air pipe 32 respectively.

[0026] Furthermore, the furnace tube 21 is filled with a spherical material with high heat absorption and thermal conductivity, for example: high-purity spherical alumina; In some possible embodiments, the reduction shaft furnace system 1 includes a shaft furnace body, a furnace top storage tank 11 arranged on the shaft furnace body, and a cooling, dust removal, and filtering treatment system 12 for cooling, dust removal, purification, and dehydration of the furnace top gas generated by the shaft furnace body to form circulating gas; the cooling, dust removal, and filtering treatment system 12 is respectively connected to the shaft furnace body, the reduction gas pipe 41, and the combustion gas pipe 31; and the bottom of the shaft furnace body is externally connected to a direct reduced iron inerting device 6.

[0027] Specifically, after the reducing gas in the furnace tube 21 is heated, it enters the shaft furnace body to reduce the oxidized pellets to form metallized pellets; the metallized pellets enter the direct reduced iron inerting device 6; the top gas generated after the reduction in the shaft furnace body is cooled, dusted, purified, and dehydrated by the cooling, dust removal, and filtration treatment system 12 to form circulating gas; the cooling, dust removal, and filtration treatment system 12 is a prior art system that is mainly used for cooling, dusting, purifying, and dehydrating the top gas, and its structure is not further described; In some possible implementations, an output main pipe is provided at the outlet of the cooling, dust removal and filtering treatment system 12, a branch pipe 1 30 is provided between the output main pipe and the combustion gas pipe 31; a branch pipe 2 40 is provided between the output main pipe and the reduction gas pipe 41; A combustion gas mixing device connected to the hydrogen supply system 7 is provided on the branch pipe 1 30; The second branch pipe 40 is provided with a reducing gas mixing device connected to the hydrogen supply system 7 .

[0028] The top gas is processed by the cooling, dust removal and filtration system 12 to form circulating gas. Part of the circulating gas is mixed with hydrogen provided by the hydrogen supply system 7 in the combustion gas mixing device to form combustion gas. The combustion gas enters the combustion gas pipe 31 through the branch pipe 30. The combustion gas is preheated in the preheating furnace. The furnace top gas is processed by the cooling, dust removal and filtration treatment system 12 to form circulating gas, wherein part of the circulating gas is mixed with the hydrogen provided by the hydrogen supply system 7 in the reducing gas mixing device to form reducing gas, which enters the reducing gas pipe 41 through the branch pipe 2 40. The reducing gas is preheated in the reducing gas preheating furnace 4.

[0029] In some possible implementations, a nitrogen supply system 8 is further included, and the nitrogen supply system 8 is connected to the direct reduced iron inerting device 6, the cooling, dust removal and filtration treatment system 12, and the air combustion-supporting system 9 respectively.

[0030] The nitrogen supply system 8 is used to supply nitrogen to the direct reduced iron inerting device 6, the cooling dust removal and filtration treatment system 12, and the air combustion system 9; Furthermore, the air of the air combustion-supporting system 9 is transported to the air pipe 32 through the combustion-supporting blower and is preheated in the combustion gas preheating furnace 3 .

[0031] In some possible implementations, the exhaust system 5 includes a jet chimney connected to the reduction preheating furnace body and an exhaust fan connected to the jet chimney; the heating component 42 is an electric induction coil sleeved on the outside of the reduction gas pipe 41; During the production and processing process, the preheated air and combustion gas enter the igniter 22 and are burned. The heated flue gas generated by the combustion heats the reducing gas that is preheated through the reducing gas pipe 41 and enters the furnace pipe 21, so that the temperature of the reducing gas increases. At the same time, the high-temperature flue gas generated by the heating flue gas enters the combustion furnace body. The high-temperature flue gas is used to preheat the combustion gas entering the combustion gas pipe 31 and the air entering the air pipe 32. After the air and combustion gas are preheated, the temperature is increased, and the high-temperature flue gas is converted into medium-temperature flue gas and enters the reduction preheating furnace body. It cooperates with the electromagnetic induction coil in the reduction preheating furnace body and on the reducing gas pipe 41 to preheat and heat the reducing gas in the reducing gas pipe 41. The medium-temperature flue gas is converted into low-temperature flue gas and is discharged externally under the control of the exhaust system 5.

[0032] A method for heating hydrogen-rich reducing gas for hydrogen metallurgy is based on the above-mentioned system for heating hydrogen-rich reducing gas for hydrogen metallurgy; specifically comprising the following steps: The top gas generated after reduction in the reduction shaft furnace system 1 is cooled, dusted, purified and dehydrated to form circulating gas. Part of the circulating gas is mixed with hydrogen provided by the hydrogen supply system to form combustion gas which enters the combustion preheating furnace for preheating. The preheated combustion gas enters the high-temperature heating furnace 2. Another part of the circulating gas is mixed with hydrogen provided by the hydrogen supply system to form reducing gas, which enters the reducing gas preheating furnace 4 for preheating. The preheated reducing gas then enters the high-temperature heating furnace 2. Air enters the combustion preheating furnace through the air combustion system 9 for preheating. The preheated air enters the high-temperature heating furnace 2 and burns with the combustion gas to generate heated flue gas. The heated flue gas heats the reducing gas in the high-temperature heating furnace 2. The heated reducing gas enters the reduction shaft furnace system 1 to reduce the oxidized pellets, and the heated flue gas is converted into high-temperature flue gas. The high-temperature flue gas enters the combustion gas preheating furnace 3 to preheat the combustion gas and air. The preheated high-temperature flue gas is converted into medium-temperature flue gas and enters the reducing gas preheating furnace 4 to cooperate with the heating component 42 to preheat the reducing gas inside it; the preheated medium-temperature flue gas is converted into low-temperature flue gas and discharged under the drive of the exhaust system 5.

[0033] In some possible implementations, the temperature of the reducing gas heated by the heating flue gas formed by the combustion of the combustion gas and air in the high-temperature heating furnace 2 is 900-1100° C. The temperature of the combustion gas and air in the combustion gas preheating furnace 3 after being preheated by the high-temperature flue gas transported by the high-temperature heating furnace 2 is 600-800°C; The temperature of the reducing gas in the reducing gas preheating furnace 4 after being preheated by the medium-temperature flue gas and the heating component 42 is 300-500°C; The temperature of the high-temperature flue gas is 1000-1100°C, the temperature of the medium-temperature flue gas is 400-600°C, and the temperature of the low-temperature flue gas is 150-250°C.

[0034] Example 1: A certain plant's hydrogen-based direct reduction process utilizes the aforementioned system and method, achieving a reducing gas temperature of 1050°C within the vertical furnace, significantly shortening reaction time and increasing the metallization rate and yield of finished products. The reducing gas within furnace tube 21 is heated by a high-temperature heater to a temperature of 1050°C. The heated gas, after heating the reducing gas within furnace tube 21, generates high-temperature flue gas reaching a temperature of 1100°C before entering the gas preheating furnace.

[0035] The combustion gas in the combustion gas pipe 31 and the air in the air pipe 32 are preheated by the high-temperature flue gas in the gas preheating furnace to a temperature of 750°C, and the temperature of the generated medium-temperature flue gas is 500°C; The reducing gas in the reducing gas preheating furnace 4 is preheated by the medium-temperature flue gas and the electric induction coil, so that the temperature after preheating is 450°C, and the temperature of the generated low-temperature flue gas is 200°C; it meets the requirements for direct discharge and is directly discharged into the air.

[0036] Compared with the prior art, the present invention preheats the reducing gas once in the reducing gas preheating furnace 4, and then enters the high-temperature heating furnace 2 for secondary heating. By secondary heating the preheated reducing gas, the reducing gas entering the high-temperature heating furnace 2 can be heated to a temperature suitable for the later reduction of oxidized pellets within an effective time; thereby effectively achieving full heat recovery and high energy utilization; the furnace tube 21 has a long service life and a high safety factor, and continuously and stably provides the gas-based vertical furnace with reducing gas of suitable temperature.

[0037] The present invention is not limited to the aforementioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A hydrogen-rich reducing gas heating system for hydrogen metallurgy, characterized in that: It includes a reduction shaft furnace system, a high-temperature heating furnace, a combustion gas preheating furnace, a reduction gas preheating furnace, an exhaust system, a hydrogen supply system, and an air combustion-supporting system; The reduction shaft furnace system, high temperature heating furnace, combustion gas preheating furnace, reduction gas preheating furnace, and exhaust system are connected in sequence; the reduction shaft furnace system is connected to the combustion gas preheating furnace and the reduction gas preheating furnace respectively; The hydrogen supply system is connected to the combustion gas preheating furnace and the reducing gas preheating furnace respectively; The air combustion-supporting system is connected to the combustion gas preheating furnace.

2. A hydrogen-rich reducing gas heating system for hydrogen metallurgy according to claim 1, characterized in that: The reducing gas preheating furnace includes a reducing gas preheating furnace body connected to the combustion gas preheating furnace, a reducing gas pipe arranged in the reducing gas preheating furnace body, and a heating component arranged in the reducing gas preheating furnace body and used to heat the reducing gas pipe; one end of the reducing gas pipe is connected to the high-temperature heating furnace, and the other end of the reducing gas pipe is connected to the hydrogen supply system and the reducing shaft furnace system respectively.

3. A hydrogen-rich reducing gas heating system for hydrogen metallurgy according to claim 2, characterized in that: The combustion gas preheating furnace includes a combustion furnace body connected to the high-temperature heating furnace and the reduction preheating furnace body respectively, and a combustion gas pipe and an air pipe arranged in the combustion furnace body and respectively connected to the high-temperature heating furnace; the other end of the air pipe is connected to the air combustion system; the other end of the combustion gas pipe is connected to the hydrogen supply system and the reduction vertical furnace system respectively.

4. A hydrogen-rich reducing gas heating system for hydrogen metallurgy according to claim 3, characterized in that: The high-temperature heating furnace includes a furnace body connected to the combustion furnace body, a furnace pipe installed in the furnace body with one end connected to the reduction shaft furnace system and the other end connected to the reduction gas pipe, and an igniter installed on the furnace body and connected to the combustion gas pipe and the air pipe respectively.

5. The hydrogen-rich reducing gas heating system for hydrogen metallurgy according to claim 1, characterized in that: The reduction shaft furnace system includes a shaft furnace body, a furnace top material storage tank arranged on the shaft furnace body, and a cooling, dust removal, and filtering treatment system for cooling, dust removal, purification, and dehydration of the furnace top gas generated by the shaft furnace body to form circulating gas; the cooling, dust removal, and filtering treatment system are respectively connected to the shaft furnace body, the reduction gas pipe, and the combustion gas pipe; the bottom of the shaft furnace body is externally connected to a direct reduced iron inerting device.

6. A heating system for hydrogen-rich reducing gas in hydrogen metallurgy according to claim 5, characterized in that: An output main pipe is provided at the outlet of the cooling, dust removal and filtering treatment system, a branch pipe 1 is provided between the output main pipe and the combustion gas pipe; a branch pipe 2 is provided between the output main pipe and the reduction gas pipe; A combustion gas mixing device connected to a hydrogen supply system is provided on the branch pipe 1; The second branch pipe is provided with a reducing gas mixing device connected to the hydrogen supply system.

7. The hydrogen-rich reducing gas heating system for hydrogen metallurgy according to claim 5, characterized in that: It also includes a nitrogen supply system, which is respectively connected to the direct reduced iron inerting device, the cooling, dust removal and filtering treatment system, and the air combustion-supporting system.

8. The hydrogen-rich reducing gas heating system for hydrogen metallurgy according to claim 2, characterized in that: The exhaust system includes a jet chimney connected to the reduction preheating furnace body and an exhaust fan connected to the jet chimney; the heating component is an electric induction coil sleeved on the outside of the reduction gas pipe.

9. A method for heating hydrogen-rich reducing gas for hydrogen metallurgy, characterized in that: A hydrogen-rich reducing gas heating system for hydrogen metallurgy according to any one of claims 1 to 8; The specific steps include: The top gas generated after reduction in the reduction shaft furnace system is cooled, dusted, purified and dehydrated to form circulating gas. Part of the circulating gas is mixed with hydrogen provided by the hydrogen supply system to form combustion gas which enters the combustion preheating furnace for preheating. The preheated combustion gas enters the high-temperature heating furnace. The other part of the circulating gas is mixed with the hydrogen provided by the hydrogen supply system to form reducing gas, which enters the reducing gas preheating furnace for preheating. The preheated reducing gas then enters the high-temperature heating furnace. Air enters the combustion preheating furnace through the air combustion system for preheating. The preheated air enters the high-temperature heating furnace and burns with the combustion gas to generate heated flue gas. The heated flue gas heats the reducing gas in the high-temperature heating furnace. The heated reducing gas enters the reduction shaft furnace system to reduce the oxidized pellets, and the heated flue gas is converted into high-temperature flue gas. The high-temperature flue gas enters the combustion gas preheating furnace to preheat the combustion gas and air. The preheated high-temperature flue gas is converted into medium-temperature flue gas and enters the reducing gas preheating furnace to cooperate with the heating component to preheat the reducing gas inside it; the preheated medium-temperature flue gas is converted into low-temperature flue gas and discharged under the drive of the exhaust system.

10. The method for heating hydrogen-rich reducing gas for hydrogen metallurgy according to claim 9, characterized in that: The temperature of the reducing gas heated by the heating flue gas formed by the combustion of the combustion gas and air in the high-temperature heating furnace is 900-1100°C; The temperature of the combustion gas and air in the combustion gas preheating furnace after being preheated by the high-temperature flue gas transported by the high-temperature heating furnace is 600-800°C; The temperature of the reducing gas in the reducing gas preheating furnace after being preheated by the medium-temperature flue gas and the heating component is 300-500°C; The temperature of the high-temperature flue gas is 1000-1100°C, the temperature of the medium-temperature flue gas is 400-600°C, and the temperature of the low-temperature flue gas is 150-250°C.

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