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System and method for carrying out blast furnace ironmaking by using small-particle-size bituminous coals

A blast furnace ironmaking and small particle size technology, applied in the field of coal chemical industry, can solve the problems of low utilization rate of ironmaking heat, large amount of pulverized coal, shortage of pulverized coal resources, etc., so as to fully utilize energy, reduce ironmaking costs, alleviate the The effect of scarce resources

Inactive Publication Date: 2013-12-18
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using pulverized coal as a raw material to provide heat and as a reducing agent requires a large amount of pulverized coal for injection, the resources of pulverized coal are relatively scarce, and the utilization rate of heat generated by ironmaking is low

Method used

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  • System and method for carrying out blast furnace ironmaking by using small-particle-size bituminous coals

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Experimental program
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Effect test

Embodiment 1

[0040] The pulverized coal of 0-6mm is sent to the compound dry separator for separation, and impurities such as ash in the coal are removed to obtain clean coal. Put the clean coal into the pyrolysis furnace, use the high-temperature flue gas from the blast furnace as the heat source, and control the temperature at 500-800°C to pyrolyze the clean coal in the pyrolysis furnace to obtain pyrolysis gas and pyrolysis Half focus. The calorific value of blast furnace flue gas is low, only 3500KJ / m 3 , not suitable for direct use as civil gas, and pyrolysis gas has a high calorific value, generally 16000-17000KJ / m 3, mix it with blast furnace flue gas in proportion, after further processing, the purified gas can be obtained, which can be used as civil gas or raw material gas for downstream chemical synthesis. The semi-coke discharged from the pyrolysis furnace is sent to the air-dense medium dry separator for sorting, and the ash is removed to obtain high-quality low-ash semi-coke...

Embodiment 2

[0042] The 6-20mm granular coal is sent to the compound dry separator for separation, and the ash and other impurities in the coal are removed to obtain clean coal. Put the clean coal into the pyrolysis furnace, use the high-temperature flue gas from the blast furnace, and control the temperature at 500-800°C to pyrolyze the clean coal in the pyrolysis furnace, which not only makes full use of the blast furnace flue gas In addition, carbon monoxide (about 25%), carbon dioxide (about 15%), hydrogen and other components in the blast furnace flue gas will also produce hydrogen-rich and oil-increasing effects on coal pyrolysis, which will significantly increase the yield of tar. The pyrolysis crude oil gas discharged from the pyrolysis furnace is processed to remove the dust to obtain tar and pyrolysis gas. The pyrolysis gas is purified and sent downstream for chemical synthesis, etc., and the tar can be used to extract phenols after further treatment. Classes, aromatics, etc., ca...

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Abstract

The invention discloses a system and a method for carrying out blast furnace ironmaking by using small-particle-size bituminous coals. The system comprises a pyrolyzing furnace, a semi-coke outlet of the pyrolyzing furnace is communicated with an inlet of a crusher, an outlet of the crusher is communicated with an inlet of a sieve shaker, a fine coke powder outlet of the sieve shaker is communicated with a powder spraying inlet of a blast furnace, a large-particle semi-coke outlet of the sieve shaker is communicated with an inlet of a former, an outlet of the former is communicated with an inlet of a sintering furnace, an outlet of the sintering furnace is communicated with a sintered ore inlet of the blast furnace, and a flue gas outlet of the blast furnace is divided into two paths, one path is communicated with a gas inlet of the pyrolyzing furnace, and the other path is communicated with a flue gas outlet of the pyrolyzing furnace. According to the invention, a problem of utilizing lots of small-particle-size coals produced by coal mining is solved; a shortage problem of coal resources for injection is alleviated, and a way for the utilization of semi-coke from coal pyrolysis is provided; semi-coke powder and iron ore powder are formed by mixing and sintered for use, so that resources are fully used; flue gas produced by blast furnace ironmaking is used for the pyrolysis of bituminous coal, and the heat in the flue gas is recovered, thereby reducing the energy consumption, and improving the utilization efficiency.

Description

technical field [0001] The invention belongs to the field of coal chemical industry, and relates to a process for coupling blast furnace ironmaking and pyrolysis using small particle size bituminous coal as a raw material, in particular to a system and method for using small particle size bituminous coal for blast furnace ironmaking. Background technique [0002] A large amount of small particle size coal will be produced in the process of coal mining, which is mostly used for burning at present, and the utilization rate is not high. [0003] The flue gas from the ironmaking blast furnace has a high temperature and contains combustible gas components. At present, part of the heat is recovered through heat exchange, but the utilization rate of the combustible components is not high, and it is mostly directly vented and burned. [0004] my country is the largest iron-producing country in the world, and its steel output reached 660 million tons in 2012. Coke is used in modern ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00C22B1/16
Inventor 张生军郑化安徐婕赵奕程杨小彦侯文杰李鑫张栋博
Owner SHAANXI COAL & CHEM TECH INST
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