Oxygen blast furnace iron-making process adopting water-coal-slurry as fuel

A technology of blast furnace ironmaking and coal water slurry, which is applied in blast furnaces, blast furnace details, furnaces, etc., can solve the problems of large emissions, pollution, and low productivity, and achieve the effects of eliminating pollution, reducing environmental pollution, and improving blast furnace productivity

Inactive Publication Date: 2009-10-14
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to use coal-water slurry instead of coal powder in the oxygen blast furnace ironmaking process to solve the CO caused by the traditional blast furnace production process. 2 Large emissions, serious pollution, low productivity, etc.

Method used

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  • Oxygen blast furnace iron-making process adopting water-coal-slurry as fuel
  • Oxygen blast furnace iron-making process adopting water-coal-slurry as fuel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Theoretical calculations show that 75%, 15% pellets and 10% lump ore are used as raw materials in the oxygen blast furnace, and coal-water slurry is injected from the tuyere and pure oxygen is blown in. The production technical indicators are as follows:

[0031] CWS dosage: 200kg / tHM

[0032] Oxygen consumption: 289m 3 / tHM

[0033] Coke ratio: 376kg / tHM

[0034] Furnace circulating gas volume: 278m 3 / tHM

[0035] Furnace circulation gas composition: H 2 : 21.37% CO: 77.91% N 2 : 0.72%

[0036] Bosh gas composition: H 2 : 23.51% CO: 75.77% N 2 : 0.72%

[0037] Bosh gas volume: 1113m 3 / tHM

[0038] Theoretical combustion temperature: 2050°C

[0039] Furnace top gas volume: 1552m 3 / tHM

[0040]Top gas composition: H 2 : 8.86% CO: 33.34% CO 2 : 48.72%H 2 O: 8.4% N 2 : 0.68%.

Embodiment 2

[0042] Theoretical calculations show that 75%, 15% pellets and 10% lump ore are used as raw materials in the oxygen blast furnace, and coal-water slurry is injected from the tuyere and pure oxygen is blown in. The production technical indicators are as follows:

[0043] CWS dosage: 250kg / tHM

[0044] Oxygen consumption: 311m 3 / tHM

[0045] Coke ratio: 350kg / tHM

[0046] Furnace circulating gas volume: 280m 3 / tHM

[0047] Furnace circulation gas composition: H 2 : 21.64% CO: 77.64% N 2 : 0.72%

[0048] Bosh gas composition: H 2 : 26.23% CO: 73.05% N 2 : 0.72%

[0049] Bosh gas volume: 1139m 3 / tHM

[0050] Theoretical combustion temperature: 2041°C

[0051] Furnace top gas volume: 1576m 3 / tHM

[0052] Top gas composition: H 2 : 8.93% CO: 33.20% CO 2 : 48.56%H 2 O: 8.60% N 2 : 0.71%.

Embodiment 3

[0054] Theoretical calculations show that 75%, 15% pellets and 10% lump ore are used as raw materials in the oxygen blast furnace, and coal-water slurry is injected from the tuyere and pure oxygen is blown in. The production technical indicators are as follows:

[0055] CWS dosage: 300kg / tHM

[0056] Oxygen consumption: 334m 3 / tHM

[0057] Coke ratio: 298kg / tHM

[0058] Furnace circulating gas volume: 281m 3 / tHM

[0059] Furnace circulation gas composition: H 2 : 21.77% CO: 77.50% N 2 : 0.73%

[0060] Bosh gas composition: H 2 : 27.41% CO: 71.86% N 2 : 0.73%

[0061] Bosh gas volume: 1151m 3 / tHM

[0062] Theoretical combustion temperature: 2041°C

[0063] Furnace top gas volume: 1598m 3 / tHM

[0064] Top gas composition: H 2 : 8.95% CO: 33.02% CO 2 : 48.72%H 2 O: 8.61% N 2 : 0.70%.

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Abstract

The invention belongs to the field of ferrous metallurgy and relates to a blast furnace iron-making process using water-coal-slurry as fuel and reducer for iron-making. The process using water-coal-slurry is simple and safe, and the injecting process of water-coal-slurry provides convenience for accurate control and precise measurement. A water-coal-slurry oxygen blast furnace utilizes normal-temperature oxygen and water-coal-slurry as fuel which is injected into the blast furnace so as to partially displace coke and coal dust; the injected amount of oxygen is 200 to 500 Nmt HM, the injected amount of water-coal-slurry is 200 to 400 Nm/t HM, the required weight ratio between coal and water in the water-coal-slurry is 7:3, and the required thermal value of the water-coal-slurry is larger than 20 MJ/kg. The water-coal-slurry is decomposed and burnt to generate water-gas reaction in a circulation zone of a blast-furnace tuyere, the absorbed heat can be adopted to solve the problem of 'lower hot' caused by smelting with prior oxygen blast furnaces, and a large amount of gas generated by the decomposition and burning of the water-coal-slurry raises and can relieve the problem of 'upper cold' caused by the full-oxygen injection of the blast furnace; and the water-coal-slurry oxygen blast furnace contains rich H2 so as to enhance the penetrating power and reduction performance of blast-furnace coal gas, raise the indirect reduction degree of the blast furnace and reduce the emission amount of CO2 by 200 to 500 Nm/t HM. The process reduces both manufacturing cost and pollution to environment.

Description

technical field [0001] The invention belongs to the field of ferrous metallurgy. The invention is suitable for the blast furnace ironmaking process and relates to a blast furnace ironmaking process using coal water slurry as ironmaking fuel and reducing agent. Background technique [0002] At present, more than 90% of pig iron in my country is produced by blast furnaces. The current traditional blast furnaces are loaded with ore and coke from the top of the furnace, and hot air and coal powder are injected from the tuyeres at the same time. This production process has the following problems to be solved: First, the blast furnace blast brings a large amount of inert gas N 2 , the proportion of CO in the shaft gas is less than 40%, the reduction of iron ore in the shaft is insufficient, and a large amount of FeO needs to be directly reduced with carbon in the high-temperature area of ​​the lower part of the blast furnace, resulting in a large consumption of coke and increasin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
Inventor 张建良杨天均陈永星郭豪左海滨国宏伟
Owner UNIV OF SCI & TECH BEIJING
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