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

A technology for synthesizing natural gas and coal-based synthesis, which is applied in the petroleum industry, gas fuels, fuels, etc., can solve the problems of complicated reactor manufacturing, long time consumption, high price, etc., and achieves the goal of reducing the number of reactors and reducing waste. time, the effect of improving the refining effect

Active Publication Date: 2017-08-11
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

The reactor is complex to manufacture and expensive
[0010] The life of high-temperature methane synthesis catalysts is usually 2 years, while the life of low-temperature methane synthesis catalysts is usually more than 4 years. The shutdown caused by the disassembly of methane synthesis catalysts often brings losses of hundreds of millions of yuan to large factories. The methane synthesis unit is usually the power heart of the whole plant, and the shutdown of this unit often means the complete shutdown of the whole plant, which takes quite a long time

Method used

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

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Effect test

Embodiment 1

[0033] as attached figure 1 As shown, the 3.0MPa, 40°C methane synthesis gas from the gas purification section rises to 172°C after heat exchange with the three-reverse air cooler 1, and then rises to 290°C after heat exchange with the second-reverse air cooler 2 , after being purified by fine desulfurization reactor 4, the total sulfur is less than 0.1*10 -6 and f = (n H2 -n CO2 ) / (n CO +n CO2 )=2.8~3.1 The fresh air is divided into four streams (fresh air a, b, c, d), the temperature is 285°C. Among them, the fresh gas a and the recycle gas are mixed to form a section of intake air, which enters the first section of the first methane synthesis reactor A 5 (one reaction A). The gas inlet temperature is 285°C, and the temperature rises to about 534°C after the reaction. After the gas b is mixed, it forms a second-stage intake air and enters the second stage of the first reaction A. The inlet temperature is about 488°C, and the temperature rises to about 661°C after the re...

Embodiment 2

[0039] as attached figure 1 As shown, the 1.0MPa, 40°C methane synthesis gas from the gas purification section rises to 177°C after heat exchange with the three-reverse air cooler 1, and then rises to 295°C after heat exchange with the second-reverse air cooler 2 , after being purified by fine desulfurization reactor 4, the total sulfur is less than 0.1*10 -6 and f = (n H2 -n CO2 ) / (n CO +n CO2 )=2.8~3.1 The fresh air is divided into four streams (fresh air a, b, c, d), the temperature is 290 ℃. Among them, the fresh gas a and the circulating gas are mixed to form a section of intake air, which enters the first section of the first methane synthesis reactor A 5 (one reaction A). The gas inlet temperature is 290°C, and the temperature rises to about 537°C after the reaction. After the gas b is mixed, it forms a second-stage air inlet and enters the second stage of the first reaction A. The inlet temperature is about 485°C, and the temperature rises to about 658°C after the...

Embodiment 3

[0041] as attached figure 1As shown, the 7.5MPa, 40°C methane synthesis gas from the gas purification section rises to 166°C after heat exchange with the three-reverse air cooler 1, and then rises to 285°C after heat exchange with the second-reverse air cooler 2 , after being purified by fine desulfurization reactor 4, the total sulfur is less than 0.1*10 -6 and f = (n H2 -n CO2 ) / (n CO +n CO2 )=2.8~3.1 The fresh air is divided into four streams (fresh air a, b, c, d), the temperature is 280 ℃. Among them, the fresh gas a and the recycle gas are mixed to form a section of intake air, which enters the first section of the first methane synthesis reactor A 5 (one reaction A). The gas inlet temperature is 280°C, and the temperature rises to about 524°C after the reaction. After the gas b is mixed, it forms a second-stage intake air and enters the second stage of the first reaction A. The inlet temperature is about 469°C, and the temperature rises to about 636°C after the rea...

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Abstract

The invention relates to a process for producing synthetic natural gas by methanation of coal-based synthesis gas, belonging to the technical field of comprehensive application of coal gasification, including high-temperature, medium-temperature and low-temperature methanation reaction parts. The high-temperature methanation reaction part is equipped with two adiabatic reactors, both of which adopt a series-parallel two-stage air intake mode. In order to meet the high-temperature catalyst replacement requirements, the two reactors can be isolated from the system without affecting normal operation. An adiabatic reactor is installed in each of the medium and low temperature methanation sections. A water separation heat exchanger is installed at the outlet of the medium-temperature reactor, and the outlet gas is refined by a low-temperature reactor to produce synthetic natural gas that meets the requirements of pipeline transportation. The invention has the characteristics of low circulation ratio, long continuous operation period of the system, short refining reaction process and high product gas quality.

Description

technical field [0001] The invention belongs to the technical field of comprehensive application of coal gasification, and relates to a process for producing synthetic natural gas by methanation of coal-based synthesis gas. 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 nearly 30 years, with good economic benefits. TREMP in TopsФe, Denmark TM The process first gasifies coal to obtain syngas, and then enters three adiabatic fixed-bed reactors connected in series after conversion and purificatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/08
Inventor 蔡进魏士新吴琳徐本刚朱艳芳张杰孟建陈长新蔡成伟吴学其檀结东黄先亮
Owner CHINA PETROLEUM & CHEM CORP
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