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Coal reducing gas direct reduction metallurgical process in gas-based shaft kiln and system

A gas-gas-based vertical and direct technology, applied to shaft furnaces, furnaces, furnace types, etc., can solve the problem of high cost of gas-based direct reduction metallurgical process, and achieve the effect of simple system structure and low process cost

Active Publication Date: 2009-02-04
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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AI Technical Summary

Problems solved by technology

Due to the limitation of natural gas resources, the cost of gas-based direct reduction metallurgy is high, which is not suitable for China's national conditions

Method used

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  • Coal reducing gas direct reduction metallurgical process in gas-based shaft kiln and system
  • Coal reducing gas direct reduction metallurgical process in gas-based shaft kiln and system
  • Coal reducing gas direct reduction metallurgical process in gas-based shaft kiln and system

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specific Embodiment approach

[0015] The method and system for direct reduction metallurgy of coal-based reducing gas gas-based shaft furnace of the present invention, and its preferred specific implementation methods include:

[0016] Step 1, prepare reducing gas with coal, the main components of the reducing gas are CO and H 2 , H in reducing gas 2 The volume ratio to CO is generally 1.0 to 3.0, and it can also be other ratios according to process requirements.

[0017] Step 2, using the reducing gas to carry out reduction reaction with iron ore.

[0018] Such as figure 1 As shown, the step 1 includes:

[0019] Step 11, pulverize the mixture of coal and water to make water-coal slurry;

[0020] Step 12, performing gasification treatment on the coal-water slurry: performing mixed combustion and oxidation reaction on the coal-water slurry and oxygen at high temperature and high pressure, to obtain a mixture containing CO and H 2 crude gas;

[0021] Step 13. Purifying the crude gas: performing dedusti...

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Abstract

The invention discloses a coal-derived reducing gas base shaft furnace direct reduction metallurgical method and a system thereof. Reducing gases with CO and H2 serving as the main components are prepared from coal through a coal-derived reducing gas system, and are treated by the reducing reaction with iron ore through a direct reduction metallurgical system. The reducing gases are mainly used as the reducing agents of the reducing flow, the cooling agents of the cooling flow and the fuel of the direct reducing metallurgical system. The reducing flow is composed of a reducing shaft furnace, a furnace top gas heat exchanger, a furnace top gas shock chilling / scrubbing system, a process gas recycle compressor, a compressor secondary cooler, a CO2 absorber, a process gas humidifier, a process gas heater, etc. The conical part of the lower part of the shaft furnace is the cooling zone of the shaft furnace direct reduction metallurgical furnace. The cooling gases are sprayed in from the conical region of the lower part of the shaft furnace direct reduction metallurgical furnace, and flow upwards across the metallurgical furnace. The hot cooling gases flow away the cooling region and then are cooled, compressed and recycled. The system is simple in structure and low in process cost.

Description

technical field [0001] The invention relates to a technology for preparing reducing gas from coal and performing reduction metallurgy, in particular to a direct reduction metallurgy method and system of coal-based reducing gas gas-based shaft furnace. Background technique [0002] Since the Englishman Ya Derby invented the method of coal coking in 1735, the smelting method using coke (such as blast furnace) has made great progress and reached an unprecedented degree of perfection. Coke smelting methods rely heavily on coking coal. With the depletion of coking coal resources, coking coal metallurgical technology is facing difficulties. It is imminent to develop and adopt non-coking coal ironmaking technology. [0003] Non-coking coal metallurgical process refers to various process methods for metallurgical production without using coke, which can be divided into two categories: direct reduction method and smelting reduction method. Among them, the direct reduction method is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/02C10J3/46C10K1/08
CPCC21B2100/04C21B13/02C21B2100/02C21B2100/282C21B2100/44C21B2100/64C21B2100/66Y02P10/134
Inventor 吴道洪谢善清王正华何敬成王东方陈红
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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