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

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...

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