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A coal-to-gas-gas-based shaft furnace direct reduction system and process

A gas-based shaft furnace and coal-to-gas technology, which is used in shaft furnaces, manufacturing combustible gases, furnaces, etc., to achieve the effects of low temperature, high thermal efficiency and high safety factor

Active Publication Date: 2019-10-11
NORTHEASTERN UNIV LIAONING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many problems in the connection between the coal-based reducing gas system and the gas-based shaft furnace direct reduction system, which still need to be solved by the majority of metallurgists

Method used

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  • A coal-to-gas-gas-based shaft furnace direct reduction system and process
  • A coal-to-gas-gas-based shaft furnace direct reduction system and process
  • A coal-to-gas-gas-based shaft furnace direct reduction system and process

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Experimental program
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Effect test

Embodiment 1

[0042] refer to figure 1 , this embodiment provides a coal-based gas-based shaft furnace direct reduction system, including a coal-based reducing gas system and a gas-based shaft furnace direct reduction system, wherein the coal-based reducing gas system includes a gas production unit, ash removal and wet cleaning unit , purification unit and heat exchange unit, the gas-based shaft furnace direct reduction system includes a reducing gas heating unit and a gas-based shaft furnace unit.

[0043] Specifically, the gas production unit is used to make pulverized coal into a gas rich in carbon monoxide (CO) and hydrogen (H 2 ) of crude gas, the ash removal and wet cleaning unit is used for deashing and wet cleaning of the crude gas, and the purification unit is used for desulfurization and decarbonization of the crude gas output from the ash removal and wet cleaning unit to obtain clean gas. The heat exchange unit is used to exchange heat between the clean coal gas and the top gas ...

Embodiment 2

[0082] This embodiment mainly provides the detailed structure of the reducing gas heating unit mentioned in the above embodiment 1, including the preheating furnace 1 and the heating furnace 3, specifically as follows:

[0083] refer to figure 2 A preheating furnace tube 2 is arranged in the preheating furnace 1, and the two ends of the preheating furnace tube 2 pass through the preheating furnace 1 respectively. The part of the preheating furnace tube 2 in the preheating furnace 1 is a zigzag long tube. The space outside the preheating furnace tube 2 in the preheating furnace 1 is the preheating working space.

[0084] The heating furnace 3 is provided with an array of heating furnace tubes 5, figure 2 The middle heating furnace tubes 5 are vertically arranged in three rows and five rows, parallel to each other, and can also be arranged in shapes such as concentric rings. The heating furnace tube 5 is made of a high temperature resistant alloy, so that the heating furnac...

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Abstract

The invention relates to a coal-to-gas-gas-based shaft furnace direct reduction system and a process, wherein the system includes a coal-to-reducing gas system and a gas-based shaft furnace direct reduction system. The coal-to-reducing gas system includes a gas production unit, an ash removal wet Washing unit, purification unit and heat exchange unit, the gas-based shaft furnace direct reduction system includes a reducing gas heating unit and a gas-based shaft furnace unit; the gas production unit is used to make pulverized coal into crude gas; the purification unit is used for desulfurization and decarbonization, obtaining Clean gas; the heat exchange unit is used to exchange heat between the clean gas and the top gas output from the gas-based shaft furnace unit; the reducing gas heating unit is used to heat the reducing gas to a preset temperature; the gas-based shaft furnace unit is used to Iron ore or oxidized pellets are reduced to form sponge iron. The coal-to-gas-gas-based shaft furnace direct reduction system in the present invention can utilize cheap pulverized coal to produce sponge iron through low-temperature pure oxygen fluidization, overcoming the limitation that the reducing gas used in the gas-based shaft furnace is mainly natural gas. Greatly reduced costs.

Description

technical field [0001] The invention belongs to the technical field of direct reduction, and in particular relates to a coal-to-gas-gas-based shaft furnace direct reduction system and process. Background technique [0002] Direct reduced iron (DRI), also known as sponge iron, is an iron-containing product obtained by direct reduction of iron ore below the melting temperature. With the reduction of my country's steel production capacity, the increasing pressure of energy conservation and emission reduction of steel enterprises, and the structural adjustment of the steel industry, Chinese steel enterprises can only take the short process route of electric furnace steelmaking. Sponge iron is a substitute for scrap steel, an indispensable impurity diluent for electric furnace smelting of pure and high-quality steel, a high-quality coolant for converter steelmaking, and an indispensable raw material for the development of short iron and steel metallurgy processes. With the incre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/02C10J3/46C10J3/84
CPCC10J3/46C10J3/84C21B13/0073C21B13/02Y02P10/143
Inventor 储满生王国栋李峰王正平周渝生唐珏柳政根王佳鑫李胜康刘云太
Owner NORTHEASTERN UNIV LIAONING
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