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Oxygen blast furnace and gas-based shaft furnace joint production system and joint production method

A gas-based shaft furnace and combined production technology, applied in the field of metallurgy, can solve the problems of high cost, limitation, singleness, etc., and achieve the effect of eliminating high energy consumption and solving the insufficient circulation of oxygen blast furnace top gas

Active Publication Date: 2018-09-07
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the abundant reserves of coal resources and the lack of natural gas resources in my country, the application of this ironmaking process is limited, forming a single iron and steel metallurgy long-process model with coal as the main energy source, resulting in high energy consumption, high pollution, and high costs for the entire industry. unfavorable situation

Method used

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  • Oxygen blast furnace and gas-based shaft furnace joint production system and joint production method
  • Oxygen blast furnace and gas-based shaft furnace joint production system and joint production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] refer to figure 1 and 2 , the joint production system and method of oxygen blast furnace and gas-based shaft furnace are as follows:

[0092] 1) The blast furnace top gas of the oxygen blast furnace 10 is dedusted by the dedusting device 30 and is divided into two parts. The first part of gas enters the water gas shift device 40 to generate H 2 , then enter the CO 2 The removal device 50, the second part of the gas directly enters the CO2 The removal device 50 removes part of the CO after mixing the two parts of the gas with the top gas of the gas-based shaft furnace 2 , after being pressurized by the pressurizer 60, it enters the gasifier 70 and reacts with oxygen and coal powder to obtain H 2 / CO=1~2:1 High-temperature reducing gas, part of which is blown into the oxygen blast furnace 10 from the upper and lower air inlets of the oxygen blast furnace, and the other part enters the gas-based shaft furnace 20 to reduce and oxidize pellets to produce sponge iron.

...

Embodiment 2

[0111] Basically the same as Example 1, the difference is:

[0112] According to theoretical calculation, 3000m 3 Oxygen blast furnace production technical indicators are as follows:

[0113] Oxygen consumption of oxygen blast furnace (90% purity): 245Nm 3 / tHM

[0114] Oxygen blast furnace coal ratio: 200kg / tHM

[0115] Oxygen blast furnace coke ratio: 178kg / tHM

[0116] Furnace top gas volume: 1357Nm 3 / tHM

[0117] Top gas composition: CO: 50.4%, CO 2 : 36.9%, H 2 : 6.3%, H 2 O: 2.6%, N 2 : 3.8%

[0118] Oxygen blast furnace output: 12600tHM / d

[0119] Gasifier oxygen consumption (90% purity): 162Nm 3 / tHM

[0120] Gasifier pulverized coal consumption: 225kg / tHM

[0121] Composition of circulating gas: CO: 45.8%, H 2 : 48.4%, N 2 : 5.8%

[0122] Circulating gas temperature: 1100°C

[0123] Circulating gas volume at the upper air outlet: 382Nm 3 / tHM

[0124] Circulating gas volume at the lower air outlet: 400Nm 3 / tHM

[0125] Gas-based shaft furnace o...

Embodiment 3

[0127] Basically the same as Example 1, the difference is:

[0128] According to theoretical calculation, 5000m 3 Oxygen blast furnace production technical indicators are as follows:

[0129] Oxygen consumption of oxygen blast furnace (95% purity): 225Nm 3 / tHM

[0130] Oxygen blast furnace coal ratio: 200kg / tHM

[0131] Oxygen blast furnace coke ratio: 191kg / tHM

[0132] Furnace top gas volume: 1368Nm 3 / tHM

[0133] Top gas composition: CO: 51.8%, CO 2 : 37.5%, H 2 : 6.6%, H 2 O: 2.6%, N 2 : 1.5%

[0134] Oxygen blast furnace output: 21000tHM / d

[0135] Gasifier oxygen consumption (95% purity): 133Nm 3 / tHM

[0136] Gasifier pulverized coal consumption: 200kg / tHM

[0137] Composition of circulating gas: CO: 47.8%, H 2 : 49.0%, N 2 : 3.2%

[0138] Circulating gas temperature: 900°C

[0139] Circulating gas volume at the upper air outlet: 382Nm 3 / tHM

[0140] Circulating gas volume at the lower air outlet: 400Nm 3 / tHM

[0141] Gas-based shaft furnace ou...

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Abstract

The invention discloses an oxygen blast furnace and gas-based shaft kiln combination production system and a combination production method. The oxygen blast furnace and gas-based shaft kiln combination production system comprises an oxygen blast furnace, a gas-based shaft kiln, a dust removing device, a water gas shift device, a carbon dioxide removing device, a pressurizer and a gasification furnace, wherein the dust removing device is connected with the blast furnace top gas outlet of the oxygen blast furnace; the water gas shift device is connected with the dust removing device; the gas inlet of the carbon dioxide removing device is separately connected with the dust removing device, the water gas shift device and the shaft kiln top gas outlet of the gas-based shaft kiln; the pressurizer is connected with the carbon dioxide removing device; and the gas inlet of the gasification furnace is connected with the pressurizer. By adopting the system, the problem of an insufficient circulation volume of top gas of the oxygen blast furnace can be effectively solved; and meanwhile, a sufficient gas source is provided for the gas-based shaft kiln.

Description

technical field [0001] The invention belongs to the field of metallurgy, in particular, the invention relates to a joint production system and a joint production method of an oxygen blast furnace and a gas-based shaft furnace. Background technique [0002] my country's iron and steel industry consumes a lot of resources and emits a lot of waste gas at the same time. Among them, the energy consumption and CO 2 The proportion of emissions accounted for by the steel industry is as high as 69% and 73%, respectively. At present, the traditional blast furnace ironmaking technology has reached the extreme in terms of production efficiency and energy utilization, and it is difficult to achieve substantial energy saving and emission reduction in blast furnace ironmaking only by improving operation methods. In view of the increasing awareness of global environmental protection and the increasing depletion of resources, the existing blast furnace ironmaking process must be improved to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/06C21B7/22C21B7/00C21B13/02
CPCC21B5/06C21B7/002C21B7/22C21B13/023Y02P10/122Y02P10/25
Inventor 孟嘉乐窦从从郑倩倩张照吴道洪
Owner SHENWU TECH GRP CO LTD
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