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Method by adopting carbon dioxide as transmission medium for blast furnace coal injection

A technology of carbon dioxide and blast furnace coal injection, applied in tuyere and other directions, can solve problems such as limiting blast furnace ironmaking efficiency

Inactive Publication Date: 2012-03-21
SHANGHAI GUOYE ENGINEERING TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, nitrogen is generally used as the pulverized coal transport medium for blast furnace coal injection. Nitrogen is a chemically inert gas, which does not help the reducing atmosphere required for blast furnace ironmaking, which limits the improvement of blast furnace ironmaking efficiency.

Method used

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  • Method by adopting carbon dioxide as transmission medium for blast furnace coal injection
  • Method by adopting carbon dioxide as transmission medium for blast furnace coal injection
  • Method by adopting carbon dioxide as transmission medium for blast furnace coal injection

Examples

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Embodiment 1

[0019] A method for blast furnace coal injection using carbon dioxide as a transmission medium, which is carried out in sequence as follows: a. storage and transportation of raw coal, b. preparation of dry gas, c. preparation of coal powder, d. transportation of coal powder and e. injection of coal powder ,Specific steps are as follows::

[0020] a. When storing and transporting raw coal, choose anthracite or bituminous coal with an ash content less than 15%, a sulfur content less than 1%, and a moisture content less than 2%, and control the storage and transport temperature at 70°C to 80°C;

[0021] b. When preparing dry gas, choose blast furnace hot blast stove flue gas or mixed dry gas. The mixed dry gas consists of hot blast stove flue gas with a volume of 90% to 95% and a temperature of 150°C to 300°C and a volume of 5 % to 10% and mixed with high-temperature flue gas produced by a combustion furnace with a temperature of 9000 ° C to 1000 ° C, and the obtained dry gas is ...

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Abstract

The invention relates to a blast furnace iron smelting field, in particular to a method by adopting carbon dioxide as transmission medium for blast furnace coal injection, which comprises the following steps that: a. storing and transporting raw coal; b. preparing dry gases; c. preparing pulverized coal; d. transporting the pulverized coal; and e. injecting and blowing the pulverized coal, and the method is characterized in that: d. when the pulverized coal is transported, the carbon dioxide is adopted as a carrier for the pulverized coal, and the pulverized coal is transported to a transportation pipeline through pressure difference; and e. when the pulverized coal is injected and blown, carbon dioxide gas is adopted as the carrier for the pulverized coal, and the pulverized coal is delivered into the transportation pipeline through the pressure difference to be injected a blast furnace. Due to the adoption of the method, the coke ratio and the consumption of expensive coke can be reduced, and the purity and the heat value of the blast furnace coal gas can be improved.

Description

technical field [0001] The invention relates to the field of blast furnace iron smelting, in particular to a method for blast furnace coal injection using carbon dioxide as a transmission medium. Background technique [0002] Blast furnace coal injection is to directly inject pulverized anthracite or bituminous coal powder or a mixture of the two into the furnace from the blast furnace tuyere to replace coke to provide heat and reducing agent. Blast furnace coal injection is a modern blast furnace Smelting is a major technical measure to greatly reduce the coke ratio and pig iron cost. It is a major technological revolution in modern blast furnace smelting, and it has developed rapidly because of its ability to create huge economic benefits. my country is an early country in the development of coal injection technology, especially in the past ten years, blast furnace coal injection technology has been widely used and developed. Not only that, if the iron and steel industry ...

Claims

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Application Information

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IPC IPC(8): C21B7/16
Inventor 郭晓庆袁林张军吴松巧马新一
Owner SHANGHAI GUOYE ENGINEERING TECHNOLOGY CO LTD
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