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Methods and systems for producing direct reduced iron and steel mill fuel gas

A technology for steel mills and gas, applied in chemical instruments and methods, hydrogen production, combustible gas purification, etc.

Inactive Publication Date: 2017-04-19
MIDREX TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, conventionally, this poses problems due to the high levels of hydrocarbons present in COG, DRI sulfur issues, and the requirement to remove CO2 from the recycle gas

Method used

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  • Methods and systems for producing direct reduced iron and steel mill fuel gas
  • Methods and systems for producing direct reduced iron and steel mill fuel gas
  • Methods and systems for producing direct reduced iron and steel mill fuel gas

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Embodiment Construction

[0017] Likewise, in various exemplary embodiments, the present invention provides the use of COG both as a reducing gas for the production of DRI and as a steel mill gas. The COG is first compressed and then passed through a bed of activated carbon to remove the tar. The COG is then passed through a pressure swing absorption (PSA) unit or the like to produce a high purity H2 stream (about 99% purity) used as reducing gas in the direct reduction shaft furnace. The high purity H2 stream accounts for about 75% of the H2 in COG and about 40% of the total COG stream. The remainder of the COG (including all sulfur and almost all hydrocarbons), about 60% of the total COG, is directed to the steel mill as fuel gas. As a result of using high-purity H2 as the reducing gas, the endothermic (heat-consuming) hydrocarbon cracking and reforming reactions in the direct reduction shaft furnace are avoided, there is no DRI sulfur problem, and there is no concern for removal from the recycle ga...

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Abstract

A process for producing reducing gas for use in the production of direct reduced iron (DRI) and fuel gas for use in a steel mill, comprising: compressing a coke oven gas (COG) stream in a compressor; passing the compressed coke oven gas stream through an activated charcoal bed to remove tars from the compressed coke oven gas stream; separating a hydrogen-rich gas stream from the compressed cleaned coke oven gas stream using a pressure swing absorption unit; providing the hydrogen-rich gas stream to a direct reduction shaft furnace as reducing gas; and providing a remaining gas stream from the pressure swing absorption unit to a steel mill as fuel gas. Both once through and recycle options are presented. Optionally, basic oxygen fumace gas (BOFG) is added to the reducing gas.

Description

[0001] Cross References to Related Applications [0002] This patent application / patent claim is a co-pending U.S. Provisional Patent entitled "Method and System for the Production of Direct Reduced Iron and Steel Plant Gas Using Coke Oven Gas and Basic Oxygen Furnace Gas" filed on July 15, 2014 The benefit of priority of Application No. 62 / 024,767, the contents of which are hereby incorporated by reference in their entirety. [0003] field of invention [0004] The present invention generally relates to methods and systems for producing direct reduced iron (DRI). More specifically, the present invention relates to methods and systems for the production of DRI and steel mill gas using coke oven gas (COG) and basic oxygen furnace gas (BOFG). [0005] Background of the invention [0006] In a number of applications, COG needs to be used both as a reducing gas for the production of DRI and as a steel mill gas. Conventionally, however, this poses problems due to the high levels ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/02C01B3/50C01B3/22C10B27/00C10K1/00C10K1/32C10K3/00C21B13/02
CPCC01B3/50Y02P10/122C01B3/56C01B2203/043C01B2203/048C01B2203/0485C01B2203/06C21B2100/282C21B2100/60C21B13/0073C21B13/02Y02P10/134Y02P10/20C01B3/02C01B3/22C10B27/00C10K1/22C10L3/00
Inventor 罗伯特·奇雷特拉维斯·赖特
Owner MIDREX TECH INC
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