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Method and system for pulverized coal gasification for gas generation and direct reduction metallurgy of gas-based shaft furnace

A gas-based shaft furnace and coal gasification technology, applied in shaft furnaces, furnaces, furnace types, etc., can solve problems such as development restrictions, and achieve the effects of getting rid of dependence, low energy consumption, and reducing carbon deposition

Active Publication Date: 2013-03-27
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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Problems solved by technology

Therefore, the development of the gas-based reduction method using natural gas as raw material has been limited to a certain extent.

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  • Method and system for pulverized coal gasification for gas generation and direct reduction metallurgy of gas-based shaft furnace

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Embodiment Construction

[0028] In order to better illustrate the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0029] (1) The specific implementation method is as figure 1 As shown, the process flow includes:

[0030] 1. Raw coal is pulverized into pulverized coal and sent to the pulverized coal gasifier. Oxygen and water vapor are used as gasification agents. The design pressure of the pulverized coal gasifier is 0.2-4MPa;

[0031] 2. The temperature of the raw gas produced in the combustion chamber of the gasifier is reduced to 150-280°C after gas quenching and water quenching, and then after ash removal and wet cleaning, a large amount of dust and some impurities entrained in the crude gas are removed , get CO and H 2 Gases with main components, CO and H 2 The volume percentage of dry gas accounts for 80-94%;

[0032] 3. The crude g...

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Abstract

The invention provides a method for pulverized coal gasification for gas generation and direct reduction metallurgy of a gas-based shaft furnace. According to the method, feed coal is ground and then enters a gasification furnace in a form of pulverized coal; the pulverized coal reacts with a gasification agent oxygen and water vapor to generate crude gas rich in CO and H2; the high-temperature raw gas generated by the gasification furnace is subjected to cooling and wet cleaning for dust removal to obtain crude synthesis gas mainly containing CO and H2; the crude synthesis gas is adjusted into a reducing agent for a gas-based shaft furnace through water vapor conversion and purification; and the reducing agent enters the shaft furnace and reacts with lump ores or pellets to generate reducing iron. Through the invention, the coal gasification is combined with a gas-based direct reduction shaft furnace technology, thus the limitation on total natural gas of a gas-based direct reducing method is overcome, and large-scale production is realized; and the method has the advantages of low energy consumption, little pollution and the like.

Description

technical field [0001] The invention relates to a shaft furnace direct reduction metallurgy method and system, in particular to a pulverized coal gasification gas production method and a gas-based shaft furnace direct reduction metallurgy method and system. Background technique [0002] Traditional iron and steel metallurgy is to follow the traditional blast furnace, converter process. Carbon metallurgy is the main feature of this process. Blast furnace ironmaking consumes a lot of coke, which must be accompanied by sintering and coking processes. Coking coal is completely converted into carbon dioxide during the reduction process. Therefore, the high emission of carbon dioxide has become the biggest drawback of the blast furnace and converter process. At the same time, a large amount of dioxin and 3,4 benzopyrene are produced in the production process, which has become the largest pollution source in steel production. [0003] In view of this, the development of non-coke...

Claims

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Application Information

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IPC IPC(8): C21B13/02
CPCY02P10/143
Inventor 吴道洪叶明星
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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