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 problems such as restrictions, high costs, and high pollution, and achieve the effect of solving insufficient oxygen blast furnace top gas circulation and eliminating high energy consumption

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0099] reference figure 2 with 4 , The specific production system and method of oxygen blast furnace and gas-based shaft furnace are:

[0100] 1) After the top gas of the oxygen blast furnace 10 is dedusted by the dust removal device 30, the gas is divided into two parts. The first part of the gas enters the water gas shift device 40 to produce H 2 , Then enter CO 2 Removal device 50, the second part of gas directly enters CO 2 Removal device 50, two parts of gas and gas-based shaft furnace top gas are mixed to remove part of CO 2 . After that, the gas is divided into two parts again. One part enters the gas-based shaft furnace 20 through the nozzle at the bottom of the gas-based shaft furnace (cooling gas inlet), and the remaining part is pressurized by the pressurizer 60 and enters the gasifier 70 together with oxygen and pulverized coal. Reaction, get H 2 / CO = 1~2:1 high temperature reducing gas. A part of the gas is blown into the oxygen blast furnace 10 from the upper air...

Embodiment 2

[0118] It is basically the same as Example 1, except that:

[0119] According to theoretical calculation, 3000m 3 The technical indicators of oxygen blast furnace production are as follows:

[0120] Oxygen consumption of oxygen blast furnace (90% purity): 245Nm 3 / tHM

[0121] Oxygen blast furnace coal ratio: 200kg / tHM

[0122] Oxygen blast furnace coke ratio: 178kg / tHM

[0123] Top gas volume: 1357Nm 3 / tHM

[0124] Top gas composition: CO: 48.4%, CO 2 : 36.9%, H 2 : 8.3%, H 2 O: 2.6%, N 2 : 3.8%

[0125] Oxygen blast furnace output: 12600tHM / d

[0126] Oxygen consumption of gasifier (90% purity): 140Nm 3 / tHM

[0127] Pulverized coal consumption of gasifier: 200kg / tHM

[0128] Circulating gas composition: CO: 44.8%, H 2 : 49.4%, N 2 : 5.8%

[0129] Circulating gas temperature: 1100℃

[0130] Circulating gas volume at the upper exhaust outlet: 382Nm 3 / tHM

[0131] Circulating gas volume at the lower exhaust outlet: 400Nm 3 / tHM

[0132] Gas-based shaft furnace output: 8000tDRI / d

Embodiment 3

[0134] It is basically the same as Example 1, except that:

[0135] According to theoretical calculation, 5000m 3 The technical indicators of oxygen blast furnace production are as follows:

[0136] Oxygen consumption of oxygen blast furnace (95% purity): 225Nm 3 / tHM

[0137] Oxygen blast furnace coal ratio: 200kg / tHM

[0138] Oxygen blast furnace coke ratio: 191kg / tHM

[0139] Top gas volume: 1368Nm 3 / tHM

[0140] Top gas composition: CO: 49.8%, CO 2 : 37.5%, H 2 : 8.6%, H 2 O: 2.6%, N 2 : 1.5%

[0141] Oxygen blast furnace output: 21000tHM / d

[0142] Oxygen consumption of gasifier (95% purity): 121Nm 3 / tHM

[0143] Pulverized coal consumption of gasifier: 180kg / tHM

[0144] Circulating gas composition: CO: 46.8%, H 2 : 50.0%, N 2 : 3.2%

[0145] Circulating gas temperature: 900℃

[0146] Circulating gas volume at the upper exhaust outlet: 382Nm 3 / tHM

[0147] Circulating gas volume at the lower exhaust outlet: 400Nm 3 / tHM

[0148] Gas-based shaft furnace output: 12700tDRI / d

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Abstract

The invention discloses a joint production system and a joint production method of an oxygen blast furnace and a gas-based shaft kiln, wherein the joint production system of the oxygen blast furnace and the gas-based shaft kiln comprises the oxygen blast furnace, the gas-based shaft kiln, a dust removal device, a water-gas shift device, a carbon dioxide removal device, a pressurizer, and a gasification furnace; the dust removal device is connected to a blast furnace furnace-top gas outlet of the oxygen blast furnace; the water-gas shift device is connected to the dust removal device; the gas inlet of the carbon dioxide removal device is separately connected to the dust removal device, the water-gas shift device and the shaft kiln kiln-top gas outlet of the gas-based shaft kiln; the pressurizer is connected to the carbon dioxide removal device; and the gas inlet of the gasification furnace is connected to the pressurizer. The system can be used for effectively solving the problem that the oxygen blast furnace furnace-top gas circulation amount is insufficient, and also provides a sufficient gas source for the gas-based shaft kiln.

Description

Technical field [0001] The invention belongs to the field of metallurgy. Specifically, the invention relates to a combined production system and a combined 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. Among them, the energy consumption and CO of the blast furnace ironmaking system composed of sintering pellets, coking, blast furnace and hot blast stove 2 Emissions account for 69% and 73% of the steel industry respectively. At present, traditional blast furnace ironmaking technology has reached its limit in terms of production efficiency and energy utilization. It is difficult to achieve substantial energy saving and emission reduction in blast furnace ironmaking only by relying on improvements in operating methods. In view of the increasing awareness of global environmental protection and the depletion of resources, the existi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B7/00C21B13/02C21B13/14C21B5/06C21B7/22
CPCC21B5/06C21B7/00C21B7/22C21B13/023C21B13/14Y02P10/122Y02P10/25
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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