Method for preheating shifted hydrogen by utilizing direct reduction iron furnace top gas

A gas preheating and furnace top gas technology, which is applied to furnaces, shaft furnaces, furnace types, etc., can solve the problems of non-recycling of crude gas, waste heat, and insufficient use of waste gas.

Inactive Publication Date: 2021-04-16
苏亚杰 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the crude gas in this patent is not recycled, and only the sensible heat of the crude gas is used once, and the furnace top gas after the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Using water gas hydrogen production process. DRI top gas temperature is 350-500°C, pressure 1-4kg, after dedusting, it exchanges heat with hydrogen at room temperature, after the furnace top gas cools down to <150°C, it enters the compressor to pressurize to 10kg, and enters the hydrogen production process.

[0042] The hydrogen production process adopts the water gas hydrogen production process technology in the coal chemical industry, especially the separation and extraction of H by pressure swing adsorption. 2 , Separation and recovery of S, separation and recovery of CO 2 , get H 2 Normal temperature transformation hydrogen with content ≥96%, pressure 4-8kg, temperature <25°C, oxidation degree ≤3%.

[0043] After heat exchange between normal temperature shifted hydrogen and furnace top gas, medium temperature shifted hydrogen at 330-480°C is obtained, and then ≤3% O is added by partial oxidation method 2 , to obtain medium-high temperature shift hydrogen with oxi...

Embodiment 2

[0046] Using water gas hydrogen production process. DRI top gas temperature is 350-500°C, pressure 1-4kg, after dedusting, it exchanges heat with hydrogen at room temperature, after the furnace top gas cools down to <150°C, it enters the compressor to pressurize to 10kg, and enters the hydrogen production process.

[0047] The hydrogen production process adopts the water gas hydrogen production process technology in the coal chemical industry, especially the separation and extraction of H by pressure swing adsorption. 2 , Separation and recovery of S, separation and recovery of CO 2 , get H 2 Normal temperature transformation hydrogen with content ≥96%, pressure 4-8kg, temperature <25°C, oxidation degree ≤3%.

[0048] After heat exchange between room temperature shifted hydrogen and furnace top gas, medium temperature shifted hydrogen at 330-480°C is obtained, and then oxygen is used to burn CH 4 The generated high-temperature gas is mixed with medium-temperature shifted hy...

Embodiment 3

[0051] Using water gas hydrogen production process. DRI furnace top gas temperature is 350-500°C, pressure 1-4kg, after dedusting, it will exchange heat with hydrogen at room temperature, after the furnace top gas cools down to <180°C, enter the compressor to pressurize to ≥25kg, and enter the hydrogen production process .

[0052] The hydrogen production process adopts the coal hydrogen production process in the coal chemical industry, especially the low-temperature methanol washing technology to separate and extract H 2 , Separation and recovery of S, separation and recovery of CO 2 , get H 2 Normal temperature transformation hydrogen with content ≥96%, pressure 4-8kg, temperature <25°C, oxidation degree ≤3%.

[0053] After heat exchange between room temperature shifted hydrogen and furnace top gas, medium temperature shifted hydrogen at 330-480°C is obtained, and then oxygen is used to burn CH 4 The generated high-temperature gas is mixed with medium-temperature shifted...

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Abstract

The invention relates to a method for preheating shifted hydrogen by utilizing direct reduction iron furnace top gas. The method comprises the following steps: cooling the furnace top gas to less than 180 DEG C, pressurizing to more than 9kg, obtaining normal-temperature shifted hydrogen with the H2 content more than or equal to 96% by using a CO-H2 technology, exchanging heat with the furnace top gas, heating to 330-480 DEG C, heating to 400-600 DEG C by using a partial oxidation method, adding into molten iron bath high-temperature raw gas, obtaining furnace feeding circulating reduction gas with the hydrogen-carbon ratio greater than 1.1, the temperature being 630-1050 DEG C and the oxidation degree (H2O + CO2) less than or equal to 3%, and introducing the circulating reduction gas into a direct reduction iron shaft furnace to produce direct reduction iron. According to the method, heat exchange is carried out between the furnace top gas and the shifted hydrogen, the temperature of the shifted hydrogen is further increased by the partial oxidation method, the heat of the direct reduction iron furnace top gas, the heat generated by shift reaction and water vapor in the furnace top gas are fully utilized, and the energy utilization efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of direct reduced iron, and relates to a method for smelting direct reduced iron by using high-temperature raw gas in a molten iron bath, in particular to a method for converting direct reduced iron furnace top gas into CO through coal chemical industry 2 Finally, the method of transforming hydrogen at normal temperature and exchanging heat with furnace top gas is obtained. The method of the invention can further make full use of the heat of direct reduction iron furnace top gas, the heat generated by shift reaction and the heat generated by compressed gas, thereby improving the energy utilization efficiency. Background technique [0002] The existing natural gas and coke oven gas shaft furnace iron reduction technologies such as MIDREX, HYL-Ⅲ, CSDRI, CTR, WTY-DRI, etc., are inseparable from CH 4 Reformer and reducing gas reheating process. For example, in the typical MIDREX technology, the reducing gas is...

Claims

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Application Information

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IPC IPC(8): C21B13/02
CPCC21B13/02C21B13/0073
Inventor 苏亚杰牛强杜英虎陈寿林苏亚达
Owner 苏亚杰
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