System and method for directly reducing iron by gas mixture of coal-bed gas for deoxidization treatment and furnace-top gas of vertical furnace

A deoxidation treatment and coal bed gas technology, applied in the field of metallurgy, can solve problems such as explosion, long treatment process, and difficulty in large-scale promotion in areas with high natural gas costs, so as to reduce CO2 emissions, meet safe use requirements, and improve resource utilization. Effect

Pending Publication Date: 2017-08-04
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the treatment process is long, and there is still a risk of explosion due to the presence of oxygen in the gas treatment process.
Moreover, the premise of this technology is to fill the gas with a large amount of natural gas, which is still difficult to promote on a large scale in areas where natural gas is scarce or expensive.

Method used

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  • System and method for directly reducing iron by gas mixture of coal-bed gas for deoxidization treatment and furnace-top gas of vertical furnace
  • System and method for directly reducing iron by gas mixture of coal-bed gas for deoxidization treatment and furnace-top gas of vertical furnace

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Such as figure 1 with 2 Shown, the above-mentioned system that the present embodiment uses carries out iron reduction, and its methane content using the coal bed gas of mining is 50% (volume percentage); Furnace top gas is H 2 , CO, CO 2 with N 2 The mixed gas, the temperature is 370 ℃.

[0054] In step 100, the coalbed methane is deoxidized in a pressure swing adsorption device with two adsorption towers. The adsorbent is carbon molecular sieve. The output pressure of the final coalbed methane is 200KPa, and more than 95% of the oxygen in the coalbed methane is removed after pressure swing adsorption. Then the deoxidized coal bed gas is sent into the mixer 2 . In step 200, the shaft furnace 1 produces top gas. In step 300, the deoxidized coal bed gas 800Nm 3 / h and top gas 2800Nm 3 / h After fully mixing in the mixer 2, in step 400, the mixed gas is passed into the water washing tower 3 for cooling and dust removal, and then in step 500, gas-liquid separation is...

Embodiment 2

[0058] Such as figure 1 with 2 Shown, the above-mentioned system that the present embodiment uses carries out iron reduction, and its methane content using the coal bed gas of mining is 40% (percentage by volume); Furnace top gas is H 2 , CO, CO 2 with N 2 The mixed gas, the temperature is 380 ℃;

[0059] In step 100, the coalbed methane is deoxidized in two adsorption tower pressure swing adsorption devices. The adsorbent is carbon molecular sieve. The output pressure of the final coalbed methane is 200KPa, and more than 95% of the oxygen in the coalbed methane is removed after pressure swing adsorption. Then the deoxidized coal bed gas is sent into the mixer 2 . In step 200, the shaft furnace 1 produces top gas. In step 300, 900Nm of the deoxidized coal bed gas 3 / h and top gas 3200Nm 3 / h After fully mixing in the mixer 2, in step 400, the mixed gas is passed into the water washing tower 3 for cooling and dust removal, and then in step 500, gas-liquid separation is ...

Embodiment 3

[0063] Such as figure 1 with 2 Shown, the above-mentioned system that the present embodiment uses carries out iron reduction, and its methane content of using the coal bed gas exploited is 80% (volume percent); Furnace top gas is H 2 , CO, CO 2 with N 2 The mixed gas, the temperature is 400 ℃;

[0064] In step 100, the coalbed methane is deoxidized in a pressure swing adsorption device with two adsorption towers. The adsorbent is carbon molecular sieve. The output pressure of the final coalbed methane is 200KPa, and more than 95% of the oxygen in the coalbed methane is removed after pressure swing adsorption. Then the coal bed gas after deoxidation is sent in the mixer 2. In step 200, the shaft furnace 1 produces top gas. In step 300, the deoxidized coal bed gas 500Nm 3 / h and top gas 2900Nm 3 / h After fully mixing in the mixer 2, in step 400, the mixed gas is passed into the water washing tower 3 for cooling and dust removal, and then in step 500, gas-liquid separatio...

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Abstract

The invention relates to a system for directly reducing iron by the mixed gas of deoxidized coal bed gas and shaft furnace top gas. The system includes coal bed gas deoxidation device, shaft furnace, mixer, water washing tower, gas-liquid separator, reformer Furnaces and furnaces. The invention not only utilizes a large amount of coalbed methane resources, but also avoids the risk of explosion, and effectively reduces the amount of CO in the system. 2 The problem of emissions has been realized, and the efficient utilization of resources and energy in the production process of sponge iron has been realized.

Description

technical field [0001] The invention relates to the technical field of metallurgy, and more specifically relates to a system and a method for directly reducing iron by a mixture gas of deoxidized coal bed gas and shaft furnace top gas. Background technique [0002] In 2015, the world's direct reduced iron production was 72.57 million tons, of which the direct reduced iron produced by the gas-based shaft furnace method accounted for about 80%. At present, one of the mature gas-based shaft furnace direct reduction ironmaking processes is the HYLIII (Energiron) process. The HYLIII method uses natural gas and part of the furnace top gas as raw materials, and produces reducing gas through the catalytic reforming reaction of raw natural gas and reforming agent water vapor in the reforming furnace. After being heated to 900-950 °C in the heating furnace, it is passed into the shaft furnace for reduction. iron ore. The existing processes use natural gas as the gas source to produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/02
CPCC21B13/02C21B13/0073
Inventor 刘亮邓君范志辉员晓唐敬坤吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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