System and method for preparing reducing gas for gas-based shaft furnace

A gas-based shaft furnace and preparation system technology, applied in the field of iron and steel metallurgy, can solve the problems of unmatched subsequent utilization processes, high gasifier pressure, waste of coke oven gas, etc., and achieves flexible and adjustable gas components and product gas quality. Good, low-cost effects

Active Publication Date: 2017-11-10
CERI ENERGY & AIR PROTECTION TECH CO LTD +1
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Problems solved by technology

None of the existing coal gasification processes can directly provide gas components that meet the requirements, and a conversion device is needed to adjust the gas components, and there are generally disadvantages such as high pressure in the gasifier, strict requirements on raw materials, high gas production costs, and high energy consumption.
[0004] my country's coke oven gas resources are abundant, and the follow-up utilization process is not matched, resulting in a large amount of waste of coke oven gas

Method used

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  • System and method for preparing reducing gas for gas-based shaft furnace

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Embodiment 1

[0046] This embodiment provides a gas-based shaft furnace reduction gas preparation system and method, please refer to figure 1 , which is a schematic diagram of the preparation system of this embodiment, the preparation system includes a gas-based shaft furnace 2, a gas-based shaft furnace top gas scrubber 6, a top gas decarburization device 21, a coke oven gas purification device 7, a coke oven gas Desulfurization device 8, reformer 9, coal gasifier 10, heat recovery device 13, synthesis gas dedusting device (dry dedusting device 11), synthesis gas desulfurization and decarbonization device 14, mixer 12 and heating device 20;

[0047] The furnace body of the gas-based shaft furnace 2 is provided with an iron ore feed inlet 1, a direct reduced iron outlet 5, a reducing gas inlet 4 and a top gas outlet 3; the top gas outlet 3 is connected to the gas-based shaft furnace The inlet of furnace top gas scrubber 6 is connected;

[0048] The reformer 9 includes an airtight shell, an...

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Abstract

The invention provides a system and a method for preparing reducing gas for a gas-based shaft furnace. The system comprises a gas-based shaft furnace top gas scrubber, a top gas decarbonization device, a coke oven gas purification device, a coke oven gas desulfurization device, a reformer, a heat recovery unit, a syngas dust removal device, a syngas desulfurization and decarbonization device and a mixer. According to the system and the method, coke oven gas and syngas from a gasifier are combined, and effective gas components in the coke oven gas and high-temperature characteristics of the syngas are sufficiently used for producing the reducing gas for direct reduction iron; the system has the advantages of flexible and adjustable gas components, high thermal efficiency, low cost, good product gas quality and the like.

Description

technical field [0001] The invention relates to a system and method for preparing reducing gas of a gas-based shaft furnace, belonging to the technical field of iron and steel metallurgy. Background technique [0002] The combination of blast furnace ironmaking process and converter forms a high-efficiency and large-scale steel production process, which is the main force of steel production in the world. However, due to its long process, high energy consumption, heavy pollution, and the need to consume coke, the development space is gradually limited. Countries around the world have begun to turn to non-blast furnace steelmaking technology and develop short-process electric furnace steelmaking with scrap steel and direct reduced iron as raw materials. It is an environmentally friendly and resource-saving steelmaking technology. In this technology, direct reduced iron can dilute the carbon, copper, manganese, zinc and other impurities in scrap steel, and the market demand in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/38C21B13/02
CPCC21B13/0073C21B13/02C01B3/38C01B2203/0485C01B2203/0465C01B2203/06C01B2203/0238C01B2203/1241C01B2203/0838C01B2203/1058Y02P10/122Y02P20/10Y02P10/143
Inventor 孙加亮杨伟明赵红牛得草吴英军
Owner CERI ENERGY & AIR PROTECTION TECH CO LTD
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