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A process for producing metallurgical reduction gas and co-production of liquefied natural gas by using coke oven gas

A technology for liquefied natural gas and coke oven gas, which is applied in refrigeration and liquefaction, liquefaction, carbon monoxide, etc., to achieve the effects of stable operation, high reliability, and high heat utilization rate

Active Publication Date: 2017-10-20
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to propose a process for producing metallurgical reducing gas and co-producing liquefied natural gas by using coke oven gas to address the shortcomings of the existing method for producing metallurgical reducing gas from coke oven gas

Method used

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  • A process for producing metallurgical reduction gas and co-production of liquefied natural gas by using coke oven gas

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Embodiment 1

[0038] A kind of technology that utilizes coke oven gas to produce metallurgical reduction gas to co-produce LNG, the concrete steps of described technology are as follows:

[0039] (1) Pre-purification

[0040] Coke oven gas flow rate is 32000Nm 3 / h, where, in terms of volume percentage, H 2 content of 57.2%, CO content of 6.8%, CH 4 The content is 24%, CO 2 The content is 2.6%, N 2 content of 5%, polycarbonate content of 3.6%, O 2 The content is 0.8%. Impurity content: benzene, toluene content about 3500mg / Nm 3 , the naphthalene content is about 200mg / Nm 3 , tar and dust content about 100mg / Nm 3 , the ammonia content is about 45mg / Nm 3 , H 2 S content about 200mg / Nm 3 , the organic sulfur content is about 250mg / Nm 3 , the ratio of the total volume percentage is 100%. The raw coke oven gas of this composition enters the pre-purification device at a temperature of 40°C and a pressure of 7kPa, and uses the adsorption of coke to reduce the tar content to 4mg / Nm 3 ...

Embodiment 2

[0056] A kind of technology that utilizes coke oven gas to produce metallurgical reduction gas co-production LNG, same as embodiment 1, wherein:

[0057] In step (1), the coke oven gas flow rate is 42000Nm 3 / h, where, in terms of volume percentage, H 2 content of 57.1%, CO content of 7%, CH 4 The content is 24%, CO 2 The content is 2.5%, N 2 content of 5%, polycarbonate content of 3.9%, O 2 The content is 0.5%. Impurity content: benzene, toluene content about 4000mg / Nm 3 , the naphthalene content is about 200mg / Nm 3 , tar and dust content about 120mg / Nm 3 , the ammonia content is about 48mg / Nm 3 , H 2 S content about 200mg / Nm 3 , the organic sulfur content is about 300mg / Nm 3 , the ratio of the total volume percentage is 100%. The raw coke oven gas of this composition has a temperature of 40°C and a pressure of 7kPa, and enters the pre-purification device, and uses the adsorption of coke to reduce the tar content to 4mg / Nm 3 Below, naphthalene content is reduced ...

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Abstract

The invention belongs to the technical field of producing metallurgical reducing gas, and relates to a method for producing methane-enriched gas from industrial exhaust gas containing carbon and hydrogen, in particular to a process for producing metallurgical reducing gas and co-producing liquefied natural gas by using coke oven gas. The process uses coke oven gas as raw material, and is pre-purified to remove impurities such as tar and naphthalene, and then sent to the gas cabinet for buffering, compressor pressurization, deep purification to remove tar and naphthalene, TSA process to remove benzene and ammonia, and liquefy Pre-purification removes CO2, H2S and water, and then undergoes membrane separation to obtain rich H2. The remaining gas enters the liquefaction unit, and separates to obtain carbon monoxide gas and by-product liquid methane. The invention makes full use of the coke oven gas resource, produces LNG by-product while obtaining the metallurgical reducing gas, and has obvious economic benefits.

Description

technical field [0001] The invention belongs to the technical field of producing metallurgical reducing gas, and relates to a method for producing methane-enriched gas from industrial exhaust gas containing carbon and hydrogen, in particular to a process for producing metallurgical reducing gas and co-producing liquefied natural gas by using coke oven gas. Background technique [0002] Metallurgical reducing gas refers to the gas that can directly reduce metal compounds (mainly containing CO and H 2 ). Metallurgical reducing gas can reduce oxidized iron to obtain metallic iron below the softening temperature of iron ore, realizing coke-free ironmaking with low carbon consumption and CO 2 Therefore, the use of metallurgical reducing gas for ironmaking is of great significance to reduce primary mineral energy consumption and protect the environment. [0003] At present, the main source of metallurgical reducing gas is the reforming reaction of natural gas (the natural gas-ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/50C01B32/40C10L3/10C10K1/32C10K1/00F25J3/08
Inventor 李煊李泽军吴路平马磊李俊宏徐华龙
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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