Gas purification method applied to coal-based synthetic natural gas device

A technology of gas purification and coal-based synthesis, which is applied in combustible gas purification, combustible gas purification/transformation, gas fuel, etc., and can solve the problems of large energy consumption and large consumption of methanation systems

Active Publication Date: 2017-08-04
WISON ENG
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Problems solved by technology

However, due to the large amount of steam, water or inert gas introdu

Method used

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  • Gas purification method applied to coal-based synthetic natural gas device
  • Gas purification method applied to coal-based synthetic natural gas device
  • Gas purification method applied to coal-based synthetic natural gas device

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Embodiment 1

[0056] like figure 2 As shown, it is the coal-based synthetic natural gas process route of the present invention, followed by coal gasification to produce crude synthesis gas (1b), and the crude synthesis gas (1b) is adjusted by 3(H 2 -CO 2 ) / (CO+CO 2 ) ratio is approximately equal to the shift gas (2b) of 0.9~1.1, the shift gas (2b) is only desulfurized by the purification device, but does not remove CO 2 , CO 2 As the heat transfer medium or diluent gas of the methanation reaction, it passes through the methanation reactor to finally obtain the crude methane product gas (4b), and the CH in the crude methane product gas (4b) 4 Content 20%~50%, CO 2 The content is 45% to 75%, which is very different from the SNG product produced by the traditional methanation unit, and the CO must be removed centrally through the purification unit 2 In order to obtain the SNG product (5b) that meets the requirements of natural gas products. Specifically, the crude synthesis gas 1b gener...

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Abstract

The invention relates to a gas purification method applied to a coal-based synthetic natural gas device. The coal-based synthetic natural gas device comprises a coal gasifier, a transformation heat recycling device, a purification device and a methanation reactor, wherein the purification device comprises a purification and desulfurization system and a purification and decarbonization system. The gas purification method is characterized by simultaneously desulfurizing transformation gas from an upstream device and decarbonizing crude methane product gas from a downstream methanation reactor, namely desulfurizing the transformation gas obtained by transformation of the transformation heat recycling device via the purification and desulfurization system and subsequently introducing the transformation gas into the methanation reactor to prepare the crude methane product gas, and removing CO2 in the transformation gas via the purification and decarbonization system to obtain the SNG (Synthetic Natural Gas) product. Compared with the prior art, the purification requirements of two raw material gases can be simultaneously met; the purification effect is excellent; meanwhile, the absorbent can be recycled, so that the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of coal-based synthetic natural gas, in particular to a gas purification method for a coal-based synthetic natural gas device. Background technique [0002] my country's energy structure is rich in coal, low in oil and poor in gas. In recent years, as my country's environmental contradictions have become more and more prominent, natural gas as a clean energy source will be increasingly favored by people, and the demand gap for natural gas will also increase significantly. Therefore, fully Utilizing domestic coal resources for coal-to-synthetic natural gas is a good way to comprehensively utilize coal. [0003] The traditional coal-based synthetic natural gas process route is attached figure 1 As shown, coal gasification produces crude synthesis gas (1a) in turn, and the crude synthesis gas (1a) is adjusted by 3(H 2 -CO 2 ) / (CO+CO 2 ) ratio is approximately equal to the shift gas (2a) of 0.9 to 1.1, and th...

Claims

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Application Information

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IPC IPC(8): C10K1/14C10L3/10
CPCC10K1/14C10L3/103
Inventor 宫万福侯宁吕建宁闫兵海
Owner WISON ENG
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