Low-temperature pyrolysis method of coal gas for hydrogen production and co-production of LNG (liquefied natural gas)

A low-temperature pyrolysis and coal gas technology, applied in hydrogen separation, gas fuel, petroleum industry, etc., can solve the problems of high comprehensive investment and increased investment cost, achieve low energy consumption, reduce investment and operating costs, and meet the demand for hydrogen Effect

Active Publication Date: 2014-05-21
HENAN DRAGON INTO COAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the gas-to-LNG and gas-to-hydrogen extraction processes, most of them currently adopt the method of extracting hydrogen first and then cryogenically. Although the amount of cryogenic treatment is reduced, the investment cost is increased; or the PSA hydrogen extraction technology is directly used, and the overall investment is relatively high.

Method used

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  • Low-temperature pyrolysis method of coal gas for hydrogen production and co-production of LNG (liquefied natural gas)
  • Low-temperature pyrolysis method of coal gas for hydrogen production and co-production of LNG (liquefied natural gas)

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Effect test

Embodiment 1

[0027] The method of low-temperature pyrolysis coal gas hydrogen production and co-production of LNG in this embodiment is to use a certain low-temperature pyrolysis gas, whose composition is shown in Table 1, and the designed gas treatment capacity is 2.0×10 5 N m 3 / h, the target hydrogen demand is 1.02×10 5 N m 3 / h, according to which the gas volume percentage of the two parts is divided into 12%: 88%, and the heat section is carried out according to their respective processes. After the raw gas is dedusted, initially pressurized (using a screw compressor) and compressed (using a reciprocating compressor), a part (12%) is desulfurized by a dry method, and then sent to the PSA after passing through a methane conversion device and a carbon monoxide conversion device. The hydrogen extraction device extracts hydrogen. The other part (88%) is sent to the conversion device for carbon monoxide conversion, then eluted with low-temperature methanol to remove acid gas, a...

Embodiment 2

[0031] The method of low-temperature pyrolysis coal gas hydrogen production and co-production of LNG in this embodiment is to use a certain low-temperature pyrolysis gas, whose composition is shown in Table 2, and the designed gas processing capacity is 2.0×10 5 N m 3 / h, the target hydrogen demand is 1.48×10 5 N m 3 / h, according to which the gas volume percentage of the two parts is divided into 34%: 66%. The gas is firstly dedusted, initially pressurized (using a screw compressor) and compressed (using a reciprocating compressor), and a part (34%) is desulfurized by a dry process, and then sent to the PSA after passing through a methane conversion device and a carbon monoxide conversion device. The hydrogen plant extracts hydrogen. The other part (66%) is sent to the conversion device for carbon monoxide conversion, then eluted with low-temperature methanol to remove acid gas, and then sent to the cryogenic separation device for separation to produce hydrogen an...

Embodiment 3

[0035] see figure 2 , the method of low-temperature pyrolysis coal gas hydrogen production and co-production of LNG in this embodiment is to use a certain low-temperature pyrolysis gas, the composition of which is shown in Table 3, and the designed gas treatment capacity is 2.0×10 5 N m 3 / h, the target hydrogen demand is 7.42×10 4 N m 3 / h, according to this, there is no need to divide the gas into two parts, and the gas is directly dedusted, initially pressurized (using a screw compressor) and compressed (using a reciprocating compressor), and then sent to the conversion device for carbon monoxide conversion. Elute the acid gas with low-temperature methanol, and then send it to the cryogenic separation device for separation to produce hydrogen and LNG products, and send the hydrogen separated by cryogenic separation to the PSA hydrogen extraction device for further purification. Among the obtained products, the purity of the hydrogen product reaches 99.99%, the v...

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Abstract

The invention discloses a low-temperature pyrolysis method of coal gas for hydrogen production and co-production of LNG (liquefied natural gas), which comprises the steps of firstly performing dust removal and preliminary pressurization and compression on the coal gas, and dividing into two parts, wherein one part is subjected to PSA hydrogen extraction after desulfurization, conversion and transformation reactions, and the other part is applied to direct hydrogen production and preparation of hydrogen co-product LNG. The method can flexibly adjust the hydrogen output according to the amount of hydrogen, and has the advantages of low investment and operation cost, low energy consumption, high energy utilization rate and the like.

Description

technical field [0001] The invention belongs to the technical field of coal gas deep processing, in particular to a method for low-temperature pyrolysis of coal gas to produce hydrogen and co-produce LNG. Background technique [0002] During the processing and use of coal (such as coking, dry distillation, pyrolysis, etc.), a large amount of gas is produced, and the gas contains CH 4 、H 2 , CO and other useful resources and H 2 Harmful components such as S and COS, if burned directly, not only have low utilization efficiency, but also cause environmental pollution. Therefore, it is of great significance to deeply process and utilize the coal gas produced in the coal chemical industry. [0003] There are mainly the following methods of gas utilization: for most of the gas produced in coking plants, after dust removal, cooling, pressurization, and purification, it is returned to the combustion chamber of the coke oven for combustion; some coal chemical plants convert the ga...

Claims

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Application Information

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IPC IPC(8): C01B3/50C10L3/08
Inventor 朱书成白太宽张立新曹国超
Owner HENAN DRAGON INTO COAL TECH CO LTD
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