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Coal-based syngas single-pass methane production process in slurry bed

A coal-based synthesis gas, slurry bed technology, applied in gas fuel, petroleum industry, chemical/physical process and other directions, can solve the problems of cumbersome and lengthy process and high reaction temperature of SNG chemical project, achieve good economic benefits and simple process flow , control and reliable effect

Active Publication Date: 2021-08-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Purpose of the invention: To provide a coal-based syngas single-pass methane production process to solve the problems of cumbersome and lengthy process and high reaction temperature in large-scale coal-to-SNG chemical engineering projects

Method used

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  • Coal-based syngas single-pass methane production process in slurry bed

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] as attached figure 1 As shown, the 3.0MPa, 40°C fresh gas from the upstream (gas composition mole fraction H 2 0.678, CO0.222, CO 2 0.012, CH 4 0.081,N 2 0.003, C 2 h 6 0.004), the trace water that may exist in it is separated by the inlet liquid separation tank 1, and then enters the shell side of an anti-inlet preheater 2, and exchanges heat with the outlet gas of the first methane synthesis reactor, and the temperature rises to 260°C. The preheated gas enters the first methane synthesis reactor 3. After the reaction, the outlet temperature of the gas rises to 280°C, and after the heat exchange between the outlet gas and a reverse inlet gas, the temperature drops to 150°C and enters a reverse outlet liquid separation tank 4 for gas-liquid Separation, the gas at the outlet of the liquid separation tank enters the shell side of the second reverse inlet preheater 5, and exchanges heat with the outlet gas of the second methane synthesis reactor, the temperature ...

Embodiment 2

[0029] as attached figure 1 As shown, the 3.0MPa, 40°C fresh gas from the upstream (gas composition mole fraction H 2 0.678, CO0.222, CO 2 0.012, CH 4 0.081,N 2 0.003, C 2 h 6 0.004), through the inlet liquid separation tank 1 to separate the trace water that may exist in it, and then enter the shell side of an anti-inlet preheater 2, and exchange heat with the outlet gas of the first methane synthesis reactor, and the temperature rises to 270 °C, The preheated gas enters the first methane synthesis reactor 3. After the reaction, the outlet temperature of the gas rises to 290°C, and after the heat exchange between the outlet gas and a reverse inlet gas, the temperature drops to 140°C and enters a reverse outlet liquid separation tank 4 for gas-liquid Separation, the gas at the outlet of the liquid separation tank enters the shell side of the second reverse inlet preheater 5, and exchanges heat with the outlet gas of the second methane synthesis reactor, the temperatu...

Embodiment 3

[0033] as attached figure 1 As shown, the 3.0MPa, 40°C fresh gas from the upstream (gas composition mole fraction H 2 0.678, CO0.222, CO 2 0.012, CH 4 0.081,N 2 0.003, C 2 h 6 0.004), the trace water that may exist in it is separated by the inlet liquid separation tank 1, and then enters the shell side of an anti-inlet preheater 2, and exchanges heat with the outlet gas of the first methane synthesis reactor, and the temperature rises to 280°C. The preheated gas enters the first methane synthesis reactor 3. After the reaction, the outlet temperature of the gas rises to 300°C, and after the heat exchange between the outlet gas and a reverse inlet gas, the temperature drops to 130°C and enters a reverse outlet liquid separation tank 4 for gas-liquid Separation, the gas at the outlet of the liquid separation tank enters the shell side of the second reverse inlet preheater 5, and exchanges heat with the outlet gas of the second methane synthesis reactor, the temperature ...

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Abstract

The invention discloses a single-pass methane-making process of coal-based syngas in a slurry bed, which belongs to the technical field of comprehensive application of coal gasification. The coal-based synthesis gas from the upstream process exchanges heat with the gas at the outlet of the methane synthesis reactor. After being heated, it enters the first methane synthesis reactor. The reacted gas cools down after heat exchange and separates the condensate, and then is heated and enters the second methane The reaction is carried out in the synthesis reactor, and the outlet gas temperature of the reactor is relatively high. Cooling pipes are installed in the two-stage methane synthesis reactors, and the heat is recovered through a steam generator. The reaction gas is finally cooled, and the condensate is separated and sent out of the boundary area. The invention has a simple flow process, a single pass without using a circulation system, a long service life of the catalyst, low equipment investment and operating costs, and can produce product gas that meets the standard of Class I gas in GB / T 33445-2016 coal-to-synthetic natural gas, and Medium-pressure steam can be recovered, which has good economic benefits.

Description

technical field [0001] The invention belongs to the technical field of comprehensive application of coal gasification, and relates to a process for producing methane, in particular to a process for producing methane in a single pass of coal-based synthesis gas in a slurry bed. Background technique [0002] In the 1970s, the world experienced the first oil supply crisis since the industrialization revolution, which aroused widespread concern of governments and entrepreneurs in the development of alternative energy sources. In 1984, the Great Plains Coal Gasification Plant in the United States established the world's first large-scale commercial device for producing SNG from coal gasification by virtue of the Lurgi process, with a daily natural gas output of 3.89 million m 3 , has been running stably for more than 30 years, with good economic benefits. TREMP in TopsФe, Denmark TM The process first gasifies coal to obtain syngas, and then enters three fixed-bed reactors in se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J8/00
CPCC10L3/08
Inventor 蔡进殷玉圣于杨王金利吴学其张杰徐本刚朱艳芳黄先亮吴琳
Owner CHINA PETROLEUM & CHEM CORP
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