Conversion of coke oven gas carbon dioxide and gas-based shaft kiln directly reduced iron production method

A technology for coke oven gas and carbon dioxide, which is applied in the fields of combustible gas purification, combustible gas purification/transformation, petroleum industry, etc. Direct reduction requirement, effect of increasing CO content

Active Publication Date: 2009-03-25
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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Problems solved by technology

[0004] Using natural gas to produce reducing gas to produce direct reduced iron, the available natural gas resources are extremely limited; the reformed gas H 2 / CO is relatively high, it is difficult to meet the requirements for the production of direct reduced iron, resulting in increased production costs

Method used

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  • Conversion of coke oven gas carbon dioxide and gas-based shaft kiln directly reduced iron production method

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specific Embodiment approach

[0020] Gas-based shaft furnace direct reduction iron production method of the present invention, its preferred embodiment, comprises steps:

[0021] The reformed gas produced by the above coke oven gas carbon dioxide conversion method is used as the reducing gas produced by the gas-based shaft furnace direct reduction iron production method; the fuel gas heated by the coke oven gas and the conversion agent can be used by the gas-based shaft furnace direct reduction iron production method top gas.

[0022] The other part of the furnace top gas in the gas-based shaft furnace direct reduction iron production method is used as process gas, which is concentrated with the cooled reformed gas for dehydrogenation and decarbonation, and then further cooled to below 30°C to reduce saturated water vapor in the gas content, this mixed gas is the reducing gas, and then the reducing gas is heated to above 800°C, and then enters the shaft furnace to reduce iron oxide minerals to produce dire...

specific Embodiment 1

[0026] Specific embodiment one, see again figure 1 :

[0027] First of all: the coke oven gas used as raw material gas is subjected to advanced purification treatment, including: oil removal, purification and desulfurization treatment, and the sulfur content after treatment is <5PPM;

[0028] Then, use oxygen, carbon dioxide gas, and water vapor as conversion agents for conversion.

[0029] The amount of conversion agent used per mol of purified coke oven gas is: oxygen: ≤0.25 mol; carbon dioxide: ≤0.3 mol; water vapor: ≤0.3 mol.

[0030] Four raw material gases of coke oven gas, oxygen, carbon dioxide and water vapor in the above ratio are heated. Oxygen is heated above 100°C, and other gases are heated above 500°C.

[0031] Then, the heated gas is reformed in a reformer, and the reformed gas produced is used as reducing gas for the gas-based shaft furnace direct reduction iron production process.

[0032] In order to ensure efficient and stable operation of the reduction...

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Abstract

The invention discloses a method for conversing carbon oxide in coal oven gas and directly reducing Fe in a gas-based shaft furnace. The coal oven gas, to which initial purification treatment is carried out in a coking plant, is subjected to deep purification and desulfurization treatment and then is used as virgin gas, while oxygen, the carbon oxide and water vapour are used as a gas transforming agent and sent into a reformer for conversion, and reforming gas is used as reducing gas for directly reducing the Fe in the gas-based shaft furnace. Part of the gas that comes out from the top of the shaft furnace is used as fuel gas which is then used as fuel for a heating furnace; and part of the gas is used as process gas which returns to the shaft furnace as the reducing gas after being treated. The method solves a new gas source for the direction reduction in the gas-based shaft furnace and pertains to a new and highly efficient usage method of the coal oven gas. Compared with the current reforming gas from water vapour, the H2 / CO ratio of the reforming gas reduces from 4.6 of the reforming gas from the water vapour to 1.5 and is adjustable between 4.6 and 1.5.

Description

technical field [0001] The invention relates to a coke oven gas conversion and direct iron reduction technology, in particular to a method for converting coke oven gas into carbon monoxide and hydrogen by using carbon dioxide and using the converted gas to prepare reducing gas for direct reduction of iron in a gas-based shaft furnace. Background technique [0002] At present, the direct reduction method of gas-based shaft furnace to produce direct reduced iron for steelmaking is the mainstream technology for producing direct reduced iron, and natural gas is often used to make reducing gas abroad. Natural gas is in short supply in my country, and the production area is remote and the price is high; coke output ranks first in the world, coke oven gas resources are abundant, and the current utilization efficiency is low. In the coke oven gas steam reforming method in the existing methanol production method from coke oven gas, H 2 The / CO ratio is as high as 4.6; in the product...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10K1/00C21B13/00
Inventor 吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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