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Technology for preparing natural gas from coal-gasification synthetic gas

A natural gas, gas-forming technology, applied in the petroleum industry, gas fuel, fuel, etc., to reduce operating power consumption, improve economy, and reduce solvent consumption

Active Publication Date: 2013-08-14
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The coal-to-natural gas process involves processes such as air separation, coal gasification, purification, transformation, and methanation. Among them, the main process units such as air separation, gasification, purification, and transformation have mature technologies at home and abroad; and the complete methanation of syngas SNG technology is only operated by Davy Company in the UK, and the catalyst and process need to be further optimized

Method used

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  • Technology for preparing natural gas from coal-gasification synthetic gas
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  • Technology for preparing natural gas from coal-gasification synthetic gas

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Embodiment 1

[0042] Taking a typical gasifier as an example, pulverized coal reacts with oxygen and water vapor in the gasifier to generate crude gas. The typical composition of the crude gas after removing particles and tar is: 24.77%H 2 , 5.24% CH 4 , 34.13% CO, 11.07% CO 2 , 24.06%H 2 O, 0.08% H 2 S, 0.5% NH 3 , 0.08% Ar, 0.07% N 2 . The crude gas undergoes sulfur-resistant conversion first and then purification, or first purification and then sulfur-resistant conversion, and the NH in the crude gas 3 and H 2 S removed. After conversion and purification treatment, adjust the H in the raw gas 2 The / 3CO ratio is around 1.0, and the composition is: 46.65%H 2 , 15.44% CO, 32.21% CO 2 , 5.52% CH 4 , 0.16%N 2 +Ar; Then the gas enters the methanation unit. The methanation process adopts a four-stage circulating adiabatic fixed-bed reaction process, and a one-stage circulation process. After the gas at the outlet of the first-stage reactor is cooled in multiple stages, part of the ...

Embodiment 2

[0046] Taking a typical gasifier as an example, pulverized coal reacts with oxygen and water vapor in the gasifier to generate crude gas. The typical composition of the crude gas after removing particles and tar is: 24.77%H 2 , 5.24% CH 4 , 34.13% CO, 11.07% CO 2 , 24.06%H 2 O, 0.08% H 2 S, 0.5% NH 3 , 0.08% Ar, 0.07% N 2 . The crude gas undergoes sulfur-resistant conversion first and then purification, or first purification and then sulfur-resistant conversion, and the NH in the crude gas 3 and H 2 S removed. After conversion and purification treatment, adjust the H in the raw gas 2 The / 3CO ratio is around 1.0, and the composition is: 46.65%H 2 , 15.44% CO, 32.21% CO 2 , 5.52% CH 4 , 0.16%N 2 +Ar; then the gas enters the methanation unit. The methanation process adopts a four-stage circulating adiabatic fixed-bed reaction process, and a two-stage circulating process. The gas at the outlet of the first-stage reactor is cooled in multiple stages, and fresh raw mate...

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Abstract

The invention provides a technology for preparing natural gas from a coal-gasification synthetic gas. The technology mainly comprises coal gasification, feed gas purification (CO2 is not removed), water-gas shift, methanation and CO2 removal. Sulfur-containing substances in raw gas are removed firstly; and then, through water-gas shift, H2 / 3CO in a synthetic gas is adjusted within 0.8-2.0. During the methanation process, through multistage (multilevel) methanation reaction, the synthetic gas is converted into methane. After CO2 in the product gas is removed, the concentration of methane is more than 95%. Thus, the synthetic natural gas (SNG) meets the natural gas pipeline transportation standards, and meanwhile, gathering of CO2 can also be realized. By the adoption of the technology, system energy consumption and CO2 gathering cost are greatly reduced, and economical efficiency of the coal-gasified natural gas technology is raised. Meanwhile, the gathered CO2 can be subjected to geological storage or used in CO2 gasification of coal or used to prepare food-grade CO2.

Description

technical field [0001] The invention belongs to the field of natural gas production, and in particular relates to a process for producing natural gas from coal gasification synthesis gas. Background technique [0002] The energy structure of "rich in coal, less in oil, and poor in gas" has led to long-term supply-demand contradictions in my country's oil and gas resources. The rapid economic development and the pressure on people's livelihood and environmental protection have intensified my country's demand for natural gas, a clean energy source. It is estimated that by 2020, my country's natural gas demand gap will reach 150 billion cubic meters, and the degree of dependence on foreign countries will reach 50%. In addition, the sharp fluctuations in international energy prices will have a serious impact on my country's energy security. Therefore, the development of coal-to-natural gas technology and the conversion of abundant coal resources into natural gas have important ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08
Inventor 王树东王胜李德伏林乐
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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