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Process for hydrogen production and co-production of LNG from raw gas with methanation

A waste gas and methanation technology, applied in hydrogen separation, petroleum industry, gas fuel, 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, improve economical effect

Active Publication Date: 2021-06-04
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Process for hydrogen production and co-production of LNG from raw gas with methanation
  • Process for hydrogen production and co-production of LNG from raw gas with methanation
  • Process for hydrogen production and co-production of LNG from raw gas with methanation

Examples

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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 process for hydrogen production and co-production of LNG from raw gas with methanation, and belongs to the technical field of hydrogen production from raw gas. According to the process, raw gas obtained by pyrolysis of low-rank coal is used as a raw material, and high-purity hydrogen and LNG products are obtained through pretreatment, compression purification, conversion hydrogenation, desulfurization and decarburization, methanation, pressure swing adsorption and cryogenic separation. According to the invention, a tar and naphthalene multi-stage removal system is arranged in the process of hydrogen production and co-production of LNG from raw gas, and through optimal combination of all purification processes, impurities such as tar, naphthalene, ammonia and sulfur in the raw gas can be effectively removed under the condition that the impurities fluctuate in a relatively large range. According to the process, methanation is set, and the LNG productivity can be increased by 40%-60% under the condition of the same raw gas volume and hydrogen yield. Meanwhile, the concentration of methane in the raw gas is increased to 11-24% from about 6% through methanation, and is further concentrated to 24-60% through PSA, so that the amount of gas entering cryogenic separation is greatly reduced, and the investment and energy consumption of cryogenic separation are greatly reduced.

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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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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