Method for preparing hydrogen and liquefied natural gas through using gas retort raw gas

A technology for liquefied natural gas and waste gas, applied in chemical instruments and methods, hydrogen, inorganic chemistry, etc., can solve the problems of low utilization efficiency of hydrogen recycling efficiency and low comprehensive utilization of raw materials, so as to improve recycling efficiency, improve industrial chain, and comprehensively utilize Efficiency improvement effect

Active Publication Date: 2013-09-04
HUADIAN HEAVY IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to provide a method for preparing hydrogen and liquefied natural gas from raw coal gas in a retort furnace, which can effe

Method used

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  • Method for preparing hydrogen and liquefied natural gas through using gas retort raw gas

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Embodiment 1

[0033] Embodiment 1: A kind of method for preparing hydrogen and liquefied natural gas from dry distillation furnace raw gas, such as figure 1 shown, including the following steps:

[0034] ① The raw gas of retort furnace is pretreated by adsorption to remove tar and naphthalene, and then enters the gas tank for buffering;

[0035] ②The buffered raw coal gas is pressurized and enters the sulfur-tolerant shift reactor to make carbon monoxide react with steam to generate carbon dioxide and hydrogen;

[0036] ③The shift gas is desulfurized by PDS wet method, the desulfurization liquid is regenerated and recycled, and sulfur is produced as a by-product;

[0037] ④ The shifted gas after desulfurization is decarburized and hydrogenated by two-stage PSA pressure swing adsorption process; the obtained hydrogen is sent to the tar hydrogenation unit as raw material;

[0038] ⑤ The hydrogen extraction and desorption gas enters the methanation reactor after pressurization and fine desul...

Embodiment 2

[0049] Embodiment 2: A kind of method for preparing hydrogen and liquefied natural gas from dry distillation furnace raw gas, such as figure 1 shown, including the following steps:

[0050] ① The raw gas of retort furnace is pretreated by adsorption to remove tar and naphthalene, and then enters the gas tank for buffering;

[0051] ②The buffered raw coal gas is pressurized and enters the sulfur-tolerant shift reactor to make carbon monoxide react with steam to generate carbon dioxide and hydrogen;

[0052] ③The shift gas is desulfurized by PDS wet method, the desulfurization liquid is regenerated and recycled, and sulfur is produced as a by-product;

[0053] ④ The shifted gas after desulfurization is decarburized and hydrogenated by two-stage PSA pressure swing adsorption process; the obtained hydrogen is sent to the tar hydrogenation unit as raw material;

[0054] ⑤ The hydrogen extraction and desorption gas enters the methanation reactor after pressurization and fine desul...

Embodiment 3

[0060] Embodiment 3: A method for preparing hydrogen and liquefied natural gas from dry distillation furnace raw gas, comprising the following steps:

[0061] ① The raw gas of retort furnace is pretreated by adsorption to remove tar and naphthalene, and then enters the gas tank for buffering;

[0062] ②The buffered raw coal gas is pressurized and enters the sulfur-tolerant shift reactor to make carbon monoxide react with steam to generate carbon dioxide and hydrogen;

[0063] ③The shift gas is desulfurized by PDS wet method, the desulfurization liquid is regenerated and recycled, and sulfur is produced as a by-product;

[0064] ④ The shifted gas after desulfurization is decarburized and hydrogenated by two-stage PSA pressure swing adsorption process; the obtained hydrogen is sent to the tar hydrogenation unit as raw material;

[0065] ⑤ The hydrogen extraction and desorption gas enters the methanation reactor after pressurization and fine desulfurization, and the hydrogen in ...

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Abstract

The invention discloses a method for preparing hydrogen and liquefied natural gas through using a gas retort raw gas. The method comprises the following steps: carrying out adsorbing pretreatment of the gas retort raw gas for removing tar and naphthalene in the gas retort raw gas, and allowing the obtained gas retort raw gas to enter a coal gas holder for buffering; pressurizing the buffered raw gas, allowing the pressurized raw gas to enter a sulfur-tolerant shift conversion reactor, and reacting carbon monoxide with steam to generate carbon dioxide and hydrogen; carrying out PDS wet desulphurization of the obtained shift conversion gas to obtain a byproduct sulfur, and regenerating a desulphurization liquid; carrying out a two-stage PSA (pressure swing adsorption) technology of the desulphurized shift conversion gas for carbon removal and hydrogen extraction; sending the obtained hydrogen to a tar hydrogenating apparatus as a raw material; carrying out pressurization and fine desulphurization of the obtained hydrogen extracted and desorbed gas, allowing the obtained gas to enter a methanation reactor, carrying out a methanation reaction of hydrogen in the desorbed gas, carbon monoxide and carbon dioxide to generate methane, drying the obtained generated gas, and allowing the generated gas to enter a cooling box; and liquefying methane through adopting a mixed refrigerating agent liquefying process to prepare the liquefied natural gas. The method increases the recycling efficiency of hydrogen and the comprehensive utilization efficiency of the raw material, and realizes the efficient and comprehensive utilization fo the coal pyrolysis raw gas.

Description

technical field [0001] The invention relates to a method for preparing hydrogen and liquefied natural gas from dry distillation furnace raw gas, and belongs to the technical field of clean utilization of dry distillation furnace raw gas. Background technique [0002] my country's oil and natural gas resources are relatively poor, but coal resources are very rich, of which low-rank coal accounts for a large proportion. With the increasing shortage of petroleum resources, the clean utilization technology of coal has gradually become the focus of my country's energy research and development. Low-rank coal can be converted into high-quality solid fuel (semi-coke) by using low-temperature pyrolysis technology, and at the same time, coal tar and raw coal gas with high economic value are produced by-products, which is one of the effective ways for clean utilization of low-rank coal. Since 20 Since the 1990s, coal low-temperature pyrolysis technology has developed rapidly in my coun...

Claims

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Application Information

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IPC IPC(8): C10L3/08C10L3/10C01B3/16
Inventor 白建明单小勇林伟宁苏玉更闫永亮
Owner HUADIAN HEAVY IND CO LTD
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