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

Active Publication Date: 2022-05-17
SOUTHWEST RES & DESIGN INST OF CHEM IND
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Problems solved by technology

[0005] The methane content in raw coal gas is very low, no matter what kind of refrigeration process is used, the economy is relatively poor, and the purification requirements for impurities in raw coal gas are high (under the same LNG output, the lower the methane concentration in the raw gas, the lower the total gas volume entering the cold box The larger, the higher the requirement for impurity content)

Method used

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

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Embodiment 1

[0040] Raw coal gas 60℃, pressure 4kPaG, gas volume 150000Nm 3 / h (dry basis), dry basis composition (V%) nitrogen 44, hydrogen 24, carbon monoxide 12, carbon dioxide 12, methane 6, oxygen 1.0, CnHm1.0, impurity composition is (mg / Nm 3 ): tar 1000, naphthalene 500, ammonia 500, hydrogen sulfide 600, organic sulfur 200, hydrogen cyanide 200, C6 and above hydrocarbons 500.

[0041] In this embodiment, the specific steps of the raw coal gas hydrogen production co-production LNG process are as follows:

[0042] 1. Pretreatment: Raw coal gas is pressurized by the blower to 10kPaG, and then enters the horizontal tube cooler. The upper section of the horizontal tube cooler is cooled to 40°C with circulating cooling water, and the lower section is cooled with 7°C low-temperature circulating water, and the temperature is reduced to 23°C. Then enter the two-stage electric tar catcher, the tar is reduced to 100mg / Nm 3 , naphthalene reduced to 50mg / Nm 3 , the pressure drops to 6kPaG, a...

Embodiment 2

[0055] Raw coal gas 60℃, pressure 4kPaG, gas volume 150000Nm 3 / h (dry basis), dry basis composition (V%) nitrogen 44, hydrogen 24, carbon monoxide 12, carbon dioxide 12, methane 6.0, oxygen 1.0, CnHm1.0, impurity composition is (mg / Nm 3 ): tar 1000, naphthalene 500, ammonia 500, hydrogen sulfide 600, organic sulfur 200, hydrogen cyanide 200, C6 and above hydrocarbons 500.

[0056] In this embodiment, hydrogen users stop production, and all LNG is produced by adjusting the conversion rate of CO and through methanation. Specific steps are as follows:

[0057] 1. Pretreatment: Raw coal gas is pressurized by the blower to 10kPaG, and then enters the horizontal tube cooler. The upper section of the horizontal tube cooler is cooled to 40°C with circulating cooling water, and the lower section is cooled with 7°C low-temperature circulating water, and the temperature is reduced to 23°C. Then enter the two-stage electric tar catcher, the tar is reduced to 100mg / Nm 3 , naphthalene r...

Embodiment 3

[0065] Raw coal gas 60℃, pressure 4kPaG, gas volume 115000Nm 3 / h (dry basis), dry basis composition (V%) nitrogen 44, hydrogen 24, carbon monoxide 12, carbon dioxide 12, methane 6, oxygen 1.0, CnHm1.0, impurity composition is (mg / Nm 3 ): tar 1000, naphthalene 500, ammonia 500, hydrogen sulfide 600, organic sulfur 200, hydrogen cyanide 200, C6 and above hydrocarbons 500.

[0066] In this example, raw coal gas has insufficient raw material gas volume, and in order to ensure hydrogen production, no methanation is carried out. After desulfurization and decarburization, the gas directly enters the PSA unit to extract hydrogen. The specific steps are as follows:

[0067] 1. Pretreatment: Raw coal gas is pressurized by the blower to 10kPaG, and then enters the horizontal tube cooler. The upper section of the horizontal tube cooler is cooled to 40°C with circulating cooling water, and the lower section is cooled with 7°C low-temperature circulating water, and the temperature is redu...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/50C10L3/08C10L3/10
CPCC01B3/50C10L3/08C10L3/10
Inventor 吴路平汪涛蹇守华李俊宏胡瑜飞马磊
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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