Process of coal-gas one-step production of direct-reduction iron and production apparatus

Abstract

The invention is a craft method and the producing device for using coal gas one-step to produce direct reduced iron, the materials which contains carbon iron mineral are added into reducer of reducing straight stove and fall down freely, the high temperature reducing gas is ejected into reducer from the gas room at two sides of reducer, the gas penetrates the materials sidelong, after the reducing to materials, the tail gas is collected by the collecting room which is at two sides of the reducer and is in staggered arrangement with reducing gas room, in order to realize the direct reducing to materials. Thereof, the tail gas in lower reducing part is supplied by the new reducing gas and circulates.

Description

1. Technical field [0001] The invention relates to a direct-reduced iron smelting process, in particular to a process for producing direct-reduced iron by utilizing coal gas, and also relates to a production equipment for producing direct-reduced iron suitable for the above-mentioned process. 2. Background technology [0002] The known BL direct reduced iron production process was jointly developed by Shanghai Baoshan Iron and Steel Company and Lunan Fertilizer Plant. The process uses non-coking coal to produce reducing gas, and iron pellets and lump ore are used as raw materials. The main problem of this process method is: because it simply uses producer gas as reducing gas, a part of H must be added therein. 2 , thus increasing a restrictive factor of the production process and increasing the production cost; secondly, the raw material needs to be oxidized into oxidized pellets in a shaft furnace first, and then the oxidized pellets are used to produce direct reduced iron...

AI Technical Summary

Problems solved by technology

The main problem of this process method is: because it simply uses producer gas as reducing gas, a part of H must be added therein. 2 , thus increasing a restrictive factor of the production process and increasing the production cost; secondly, the raw material needs to be oxidized into oxidized pellets in a shaft furnace first, and then the oxidized pellets are used to produce direct reduced iron, which is called a two-stage method

If this happens, it will cause a substantial decrease in the strength of the pellets, pulverize under the heavy pressure of the furnace charge, block the airflow, cause the reduction reaction to stop, and damage the equipment. It is completely different to say that there is volume shrinkage" and "magnetite does not produce volume expansion during the reduction process".

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