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A process for preparing synthetic natural gas

A technology for synthesizing natural gas and coal-based syngas, which is applied in the petroleum industry, gas fuel, fuel, etc., can solve the problems of small scale and achieve the effects of reduced temperature rise, low impurity content, and high calorific value

Active Publication Date: 2017-09-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the current methanation unit is relatively small compared with the coal-to-natural gas methane synthesis unit

Method used

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  • A process for preparing synthetic natural gas

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Experimental program
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Effect test

Embodiment 1

[0023] according to figure 1 As shown in the process flow, the pressure is 3.0MPa and the space velocity is 15000h -1 The composition (vol%) of the fresh coal-based syngas is: H 2 69.5, CH 4 8.21, CO 17.84, CO 2 1.95, H 2 O 2.0, N 20.5. The initial temperature of fresh coal-based syngas is 40°C, the temperature is 160°C after one-stage heat exchange (E3) with primary reaction product gas, and the temperature is 330°C after two-stage (E2) heat exchange, after mixing with circulating gas A reverse (R1) intake air is formed, the circulation ratio is 1.5, the gas inlet temperature is 270°C, and the temperature rises to 650°C after the reaction. After heat exchange through waste heat boiler one (E1), waste heat boiler one (E1) and steam drum ( D1) Heat exchange to generate high-pressure steam, the temperature of the product gas in the first reaction is 380°C, the product gas in the first reaction and the fresh gas undergo two heat exchanges (E2 and E3), the temperatures ar...

Embodiment 2

[0025] according to figure 1 As shown in the process flow, the pressure is 3.0MPa and the space velocity is 15000h -1 The composition (vol%) of the fresh coal-based syngas is: H 2 69.5, CH 4 8.21, CO 17.84, CO 2 1.95, H 2 O 2.0, N 2 0.5. The initial temperature of the fresh coal-based syngas is 40°C, the temperature is 160°C after one-stage heat exchange (E3) with the primary reaction product gas, and the temperature is 340°C after two-stage (E2) heat exchange, after mixing with the circulating gas A reverse (R1) intake air is formed, the circulation ratio is 1.4, the gas inlet temperature is 290°C, and the temperature rises to 665°C after the reaction. After heat exchange through waste heat boiler one (E1), waste heat boiler one (E1) and steam drum ( D1) Heat exchange to generate high-pressure steam. The temperature of the first reaction product gas is 390°C. The first reaction product gas and the fresh gas undergo two heat exchanges (E2 and E3), and the temperature...

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Abstract

The invention discloses a process for preparing synthetic natural gas, which belongs to the technical field of new energy utilization. After the fresh coal-based synthesis gas exchanges heat with the primary reaction product gas from the first methanation reactor, it is mixed with the recycle gas and enters the first methanation reactor for methanation reaction. The primary reaction product gas is separated into Two parts: one part circulates into the first methanation reactor through the circulating compressor, and the other part enters the second methanation reactor after heat exchange with fresh coal-based synthesis gas, and then with the second reaction product gas for two-stage heat exchange. In the methanation reaction, the product gas of the second reaction is exchanged with the product gas of the first reaction, and then condensed and separated to obtain synthetic natural gas containing more than 95% of methane. The invention has the advantages of low investment and high energy utilization rate.

Description

technical field [0001] The invention relates to a process for preparing synthetic natural gas, which belongs to the technical field of new energy utilization. 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. Lurgi Company and South Africa Sasol Company built a set of semi-industrialized coal-to-SNG natural gas test device next to the F-T coal-to-oil plant in South Africa. The chemical plant built another natural gas test facility. The long-term stable operation performance of these two sets of devices has been recognized by the Great Plains Coal Gasification Plant in the United States. In 1984, it first established the world's first large-scale commercial device for producing SNG from coal gasification by virtue of the Lurgi process. The main process flow The following techno...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/08
Inventor 朱艳芳檀结东吴琳孟建蔡进张杰黄先亮徐本刚吴学其蔡成伟陈长新魏士新
Owner CHINA PETROLEUM & CHEM CORP
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