A methanation process for producing synthetic natural gas from coal-based syngas

A technology for synthesizing natural gas and coal-based syngas, which is applied in the petroleum industry, gas fuel, fuel, etc., and can solve the problems of large circulating gas volume, increased equipment investment, and increased power consumption of circulating gas

Active Publication Date: 2016-03-30
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

[0007] The existing coal-to-synthetic natural gas methanation technology usually uses complex devices of multiple heat exchangers and gas cyclers to control the temperature, and the amount of cycle gas used is large, which not only increases equipment investment but also greatly increases the power consumption of cycle gas

Method used

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  • A methanation process for producing synthetic natural gas from coal-based syngas

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Experimental program
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Effect test

Embodiment 1

[0026] according to figure 1 As shown in the process flow, the pressure is 1.0MPa, and the space velocity is 10000h -1 of syngas and the total sulfur in the syngas is less than 0.1*10 -6 , scaling factor f=(n H2 -n CO2 ) / (n CO +n CO2 )=2.8, the obtained syngas composition (vol%) is: H 2 67.08, CH 4 9.2, CO2 1.17, CO 2 2.05,N 2 0.5. The synthesis gas is divided into three streams (fresh gas A, B, C). The fresh gas A is mixed with the gas that has been heat-exchanged by the circulating gas preheater E4 to form a reverse-stage intake air, and then enters the first stage after passing through the feed gas heater E3. In the first section of the methane synthesis reactor R2, the gas inlet temperature is 280°C, and the temperature rises to 510°C after the reaction. The gas from the first stage of reaction is mixed with the fresh gas B of the second stage to form the inlet gas of the first stage of reaction and the second stage, which enters the first methane synthesis reacti...

Embodiment 2

[0028] according to figure 1 As shown in the process flow, the pressure is 5.5MPa, and the space velocity is 20000h -1 of syngas and the total sulfur in the syngas is less than 0.1*10 -6 , scaling factor f=(n H2 -n CO2 ) / (n CO +n CO2 )=3.1, the obtained syngas composition (vol%) is: H 2 69.5, CH 4 8.21, CO19.84, CO 2 1.95,N 20.5. The synthesis gas is divided into three streams (fresh gas A, B, C). The fresh gas A is mixed with the gas that has been heat-exchanged by the circulating gas preheater E4 to form a reverse-stage intake air, and then enters the first stage after passing through the feed gas heater E3. In the first stage of the methane synthesis reactor R2, the gas inlet temperature is 280°C, and the temperature rises to 530°C after the reaction. The gas from the first stage of reaction is mixed with the fresh gas B of the second stage to form the inlet gas of the first stage of reaction and the second stage, which enters the first methane synthesis reaction ...

Embodiment 3

[0030] according to figure 1 As shown in the process flow, the pressure is 8MPa, and the space velocity is 30000h -1 of syngas and the total sulfur in the syngas is less than 0.1*10 -6 , scaling factor f=(n H2 -n CO2 ) / (n CO +n CO2 )=3.0, the obtained synthesis gas composition (vol%) is: H 2 68.5, CH 4 8.82, CO20.23, CO 2 1.95,N 2 0.5. The synthesis gas is divided into three streams (fresh gas A, B, C). The fresh gas A is mixed with the gas that has been heat-exchanged by the circulating gas preheater E4 to form a reverse-stage intake air, and then enters the first stage after passing through the feed gas heater E3. In the first section of the methane synthesis reactor R2, the gas inlet temperature is 280°C, and the temperature rises to 535°C after the reaction. The gas from the first stage of reaction is mixed with the fresh gas B of the second stage to form the inlet gas of the first stage of reaction and the second stage, which enters the first methane synthesis re...

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Abstract

The invention belongs to the field of energy chemical industry, and discloses a methanation technique for preparing synthetic natural gas from coal-base synthetic gas, which comprises the following steps: synthetic gas, which is obtained by carrying out fine desulfurization on methane synthetic gas from a gas purification section, is divided into three fresh gas streams A, B and C; first-section inlet gas formed by mixing the fresh gas A and circulation gas enters a first section of a methane synthesis reactor, second-section inlet gas formed by mixing first-section outlet gas and fresh gas B enters a second section of the first methane synthesis reactor, and second-section outlet gas of the first methane synthesis reactor and fresh gas C are mixed and enter a second methane synthesis reactor; after outlet gas of the second methane synthesis reactor is cooled, part of gas enters a circulating compressor to be pressurized and returns to the inlet of the first section of the first methane synthesis reactor as circulating gas, and the rest of gas sequentially enters a third methane synthesis reactor and a fourth methane synthesis reactor to be subjected to methane synthetic reaction; and outlet gas of the fourth methane synthesis reactor, in which the methane content is higher than 94% on dry basis, is cooled and dehydrated to obtain satisfactory synthetic natural gas SNG.

Description

technical field [0001] The invention relates to methanation technologies such as city gas methanation and coal-based synthetic natural gas (SNG), and provides a new methanation process for preparing synthetic natural gas from coal-based syngas. Background technique [0002] A person from the China City Gas Association said that the proportion of natural gas in primary energy consumption has reached 25% in the world, while it is only 3.2% in my country. The industry has basically formed such a consensus that expanding natural gas sources will play an increasingly important role in ensuring my country's energy security and energy conservation and emission reduction, which is also in line with my country's path to developing a low-carbon economy. [0003] According to relevant data, from 2000 to 2008, my country's natural gas consumption increased by an average of 16.2% per year. It is estimated that the demand in 2010 will reach 100 billion to 110 billion cubic meters, while ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/08
Inventor 吴琳魏士新蔡进孟建朱艳芳张杰陈长新蔡成伟吴学其檀结东
Owner CHINA PETROLEUM & CHEM CORP
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