A co-production lng process of hydrogen production from raw coal gas with methanation

A raw gas and methanation technology, applied in hydrogen separation, gas fuel, petroleum industry, etc., can solve the problems of high impurity purification requirements, poor economy, low methane content, etc., to ensure long-term stable operation, reduce investment and energy consumption consumption, improve the effect of economy
CN112897464BActive Publication Date: 2022-05-17SOUTHWEST RES & DESIGN INST OF CHEM IND
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTHWEST RES & DESIGN INST OF CHEM IND
Publication Date
2022-05-17

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Abstract

The invention provides a raw coal gas hydrogen production co-production LNG process with methanation, which belongs to the technical field of raw coal gas hydrogen production. The process uses raw gas from low-rank coal pyrolysis as raw material, undergoes pretreatment, compression purification, conversion hydrogenation, desulfurization and decarbonization, methanation, pressure swing adsorption, and cryogenic separation to obtain high-purity hydrogen and LNG products. In the present invention, a tar and naphthalene multi-stage removal system is set in the raw coal gas hydrogen production and co-production LNG process. Through the optimized combination of each purification process, when the impurities in the raw coal gas fluctuate in a large range, the tar, naphthalene, ammonia, etc. , sulfur and other impurities can also be effectively removed. The process of the invention is set for methanation, and can increase the LNG production capacity by 40-60% under the same raw gas volume and hydrogen production. At the same time, the methane concentration in the raw coal gas is increased from about 6% to 11-24% through methanation, and further enriched to 24-60% by PSA, so that the gas volume entering the cryogenic separation is greatly reduced, and the cost of cryogenic separation is greatly reduced. investment and energy consumption.
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Description

technical field

[0001] The invention belongs to the technical field of hydrogen production from raw coal gas, and specifically relates to a process of hydrogen production and co-production of LNG from raw coal gas with methanation. Background technique

[0002] The basic characteristics of my country's energy resources are rich in coal, poor in oil, and low in gas. Coal resources will occupy the dominant position in my country's energy structure for a long time. Utilizing coal to produce oil and gas, alleviating the shortage of my country's oil and gas resources, and meeting the needs of the national economy and people's lives for fuel and gas have become a major demand of the national energy strategy, and it is also one of the key development directions of my country's future clean coal technology, especially coal conversion technology. one. Considering that more than 55% of my country's total coal reserves are low-rank coals, including lignite and sub-bituminous coal, whos...

Claims

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