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Blast furnace iron-making technique with hydrogen-rich fuel gas, pure oxygen and thus high efficiency and low CO2 exhaust

A blast furnace ironmaking and CO2 technology, applied in blast furnaces, blast furnace details, furnaces, etc., can solve problems such as difficult to effectively reduce the carbon dioxide emissions of blast furnaces, achieve good resource utilization compatibility, increase blast furnace utilization coefficient, and sufficient gas volume Effect

Inactive Publication Date: 2004-04-07
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In short, both the oxygen-enriched and all-oxygen blast furnace processes are ironmaking processes that use coal as the main energy source, and it is difficult to effectively reduce the carbon dioxide emissions of the blast furnace.

Method used

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  • Blast furnace iron-making technique with hydrogen-rich fuel gas, pure oxygen and thus high efficiency and low CO2 exhaust
  • Blast furnace iron-making technique with hydrogen-rich fuel gas, pure oxygen and thus high efficiency and low CO2 exhaust
  • Blast furnace iron-making technique with hydrogen-rich fuel gas, pure oxygen and thus high efficiency and low CO2 exhaust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] at a certain 350m 3 The tuyere of the blast furnace injects natural gas and pulverized coal, and blows in pure oxygen. The production index is:

[0040] Natural gas injection volume: 800m 3 / ton of iron (ie 574kg / ton of iron)

[0041] Coke ratio: 220kg / ton of iron

[0042] Coal ratio: 154kg / ton of iron

[0043] Consumption of pure oxygen: 612m 3 / ton of iron (ie 874kg / ton of iron)

[0044] Bosh gas composition: H 2 : 57%; CO: 43%

[0045] Theoretical combustion temperature: 2006°C

[0046] Furnace top gas composition: CO: 37%; CO 2 : 10.2%; H 2 : 52.5%; N 2 : 0.26%; S: 0.05%

[0047]Furnace top gas volume: 2607m 3 / ton of iron (equivalent to 1869kg / ton of iron)

Embodiment 2

[0049] at a certain 350m 3 The tuyere of blast furnace injects natural gas, coke oven gas and coal powder, and blows in pure oxygen. The production index is:

[0050] Natural gas injection volume: 500m 3 / ton of iron (ie 359kg / ton of iron)

[0051] Coke oven gas injection volume: 270m 3 / ton of iron (ie 103kg / ton of iron)

[0052] Coke ratio: 200kg / ton of iron

[0053] Coal ratio: 160kg / ton of iron

[0054] Consumption of pure oxygen: 500m 3 / ton of iron (ie 715kg / ton of iron)

[0055] Bosh gas composition, H 2 : 57.2%; CO: 42.8%

[0056] Theoretical combustion temperature: 2149°C

[0057] Furnace top gas composition: CO: 35.3%; CO 2 : 12.7%; H 2 : 51.6%; N 2 : 0.33%; S: 0.06%

[0058] Furnace top gas volume: 2130m 3 / ton of iron (equivalent to 1589kg / ton of iron)

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Abstract

The blast furnace iron-making technique includes blowing hydrogen-rich fuel gas in the blast hole of blast furnace of amount 500-1000 cu m / ton iron; normal temperature pure oxygen blasting while eliminating traditional hot blast furnace; gas in bosh containing H2 in 30-60 % except CO; gas in hearth top connecting CO+H2 in 85-95 %; and controlling the theoretic combustion temperature in 1800-2200 deg.c. The blast furnace iron-making technique can lower the blast furnace in 1800-2200 deg.c. The blast furnace iron-making technique can lower the blast furnace coke ratio to below 250 Kg / ton iron, lower CO2 exhaust by 400-600 Kg / ton iron and produce high heat value gas capable of being used as secondary energy source.

Description

Technical field: [0001] The invention belongs to a blast furnace ironmaking process, in particular to a high-efficiency and low-CO 2 Discharge hydrogen-rich gas pure oxygen blast furnace ironmaking process. Background technique: [0002] CO 2 It is one of the gases that cause the greenhouse effect, and steel companies are CO 2 Large emitters of CO emissions, among which blast furnaces are the main source of CO in the steel industry 2 main place of occurrence. In the traditional blast furnace ironmaking process, coke is generally used as the main fuel (coke ratio 400-500kg / ton iron), auxiliary pulverized coal is injected to reduce the coke ratio (coal ratio 0-150kg / ton iron), and hot air is blown at the tuyeres (air temperature 1000-1200 ℃), a small amount of oxygen enrichment in the wind, the oxygen enrichment rate is generally 0-5%, and the discharged blast furnace gas has a certain calorific value (3000-4500kJ / m 3 ), but the calorific value is not high, and it is gene...

Claims

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Application Information

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IPC IPC(8): C21B5/00
Inventor 李家新周莉英
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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