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High-temperature gas injection-based iron-making technology

A gas and high temperature technology, applied in blast furnaces, blast furnace details, reducing gas emissions, etc., can solve the problems of large emissions, low productivity, serious environmental pollution, etc., and achieve the effect of improving blast furnace productivity, reducing ironmaking costs, and reducing prices.

Inactive Publication Date: 2014-11-05
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to use the high-temperature coal gas produced by the coal gasification device in the oxygen blast furnace ironmaking process to solve the CO caused by the traditional blast furnace ironmaking process. 2 Large emissions, serious environmental pollution, low productivity and other issues; at the same time reduce or avoid CO removal from oxygen blast furnace top gas 2 and the cost of preheating circulating gas to 900-1300°C; at the same time, pulverized coal is injected into the hearth to adjust the theoretical combustion temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Theoretical calculations show that 73% sintered ore, 21% pelletized ore, and 6% lump ore are used as raw materials in the oxygen blast furnace, and the high-temperature gas generated by coal gasification is injected into the hearth tuyeres by this process to replace all the circulating gas , injecting oxygen and coal powder at the same time, injecting circulating gas from the tuyere at the lower part of the furnace body into the top of the furnace, the process flow chart is shown in the attached page of the manual figure 1 As shown, its economic and technical indicators are as follows:

[0032] Coke ratio: 220kg / tHM

[0033] Tuyere coal injection: 200kg / tHM

[0034] Oxygen consumption at tuyere: 258.49m 3 / tHM

[0035] Coal consumption of coal gasification unit: 152.88kg / tHM

[0036] Oxygen consumption of coal gasification unit: 112.56Nm 3 / tHM

[0037] Hearth tuyere circulating gas volume: 0Nm 3 / tHM

[0038] Hearth tuyere coal gasification high temperature gas...

Embodiment 2

[0048] Theoretical calculations show that 73% sintered ore, 21% pelletized ore, and 6% lump ore are used as raw materials in the oxygen blast furnace, and the high-temperature gas generated by coal gasification is injected into the hearth tuyeres by this process to replace all the circulating gas , while injecting oxygen and pulverized coal, injecting high-temperature gas from coal gasification from the tuyeres at the lower part of the furnace to replace part of the circulating gas, instead of the 200m in Example 1 3 Furnace cycle gas, the process flow chart is shown in the attached page of the manual figure 2 As shown, its economic and technical indicators are as follows:

[0049] Coke ratio: 220kg / tHM

[0050] Tuyere coal injection: 200kg / tHM

[0051] Oxygen consumption at tuyere: 258.49m 3 / tHM

[0052] Coal consumption of coal gasification unit: 240.24kg / tHM

[0053] Oxygen consumption of coal gasification unit: 176.88Nm 3 / tHM

[0054] Hearth tuyere circulating ga...

Embodiment 3

[0065] Theoretical calculations show that 73% sintered ore, 21% pelletized ore, and 6% lump ore are used as raw materials in the oxygen blast furnace, and the high-temperature gas produced by coal gasification is injected into the furnace hearth tuyere to replace part of the circulating gas. , instead of 150m in Example 1 3 The furnace hearth circulates the gas, injects oxygen and coal powder at the same time, and injects the furnace top circulation gas from the tuyere at the lower part of the furnace body. The process flow chart is shown in the attached page of the manual. image 3 As shown, its economic and technical indicators are as follows:

[0066] Coke ratio: 220kg / tHM

[0067] Tuyere coal injection: 200kg / tHM

[0068] Oxygen consumption at tuyere: 258.49m 3 / tHM

[0069] Coal consumption of coal gasification unit: 65.52kg / tHM

[0070] Oxygen consumption of coal gasification unit: 48.24Nm 3 / tHM

[0071] Hearth tuyere circulating gas volume: 200Nm 3 / tHM

[007...

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Abstract

The invention discloses a high-temperature gas injection-based iron-making technology and belongs to the field of black metallurgy. The high-temperature gas injection-based iron-making technology utilizes oxygen-rich normal-temperature air blasting to replace hot air operation, and high-temperature gas produced by a coal gasification device and CO2-free furnace top recycled gas are mixed and are respectively pumped into a blast furnace from the furnace body and the hearth so that furnace top recycled gas CO2 removal is realized. The high-temperature gas injection-based iron-making technology has a coal ratio of 240-350kg / tHM, a coal gasification unit coal-use amount of 50-250kg / tHM and a coke ratio of 180-260kg / tHM and a blast furnace capacity factor of 6.0-7.5, reduces operation costs of oxygen-containing blast furnace top gas CO2 removal and recycled gas pre-heating to a temperature of 900-1300 DEG C, realizes coke reduction and coal use increasing in blast furnace production, improves an iron-making technology energy structure and stabilizes gas balance of a steel enterprise.

Description

technical field [0001] The invention belongs to the field of ferrous metallurgy, relates to an ironmaking process based on injection of high-temperature gas, and is suitable for blast furnace ironmaking processes. Background technique [0002] At present, 90% of the pig iron in the world is produced by the traditional blast furnace ironmaking process. In the traditional blast furnace ironmaking process, the main fuel is coke and coal powder. The tuyeres inject hot air and coal powder. The traditional blast furnace ironmaking process requires the use of a large amount of coke, and coking not only requires a large amount of coking coal, but also produces a large amount of toxic and harmful substances during the coking process, which seriously pollutes the environment; the traditional blast furnace blast brings in a large amount of high-temperature inert gas N 2 , so that the proportion of CO in the furnace gas is less than 40%, and the degree of indirect reduction of iron ore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
CPCY02P10/122
Inventor 佘雪峰薛庆国王静松董择上刘锦周刘迎立
Owner UNIV OF SCI & TECH BEIJING
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