A method for producing synthetic natural gas by utilizing methanol purge gas

A technology for methanol degassing and synthesizing natural gas, applied in gas fuel, petroleum industry, fuel and other directions, can solve problems such as adiabatic temperature increase, and achieve the effects of large reaction space velocity, investment saving, and high by-product steam quality

Inactive Publication Date: 2011-12-07
大连瑞克科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But due to CO, CO 2 If the content is high, the methanation reaction will be carried out directly, and the adiabatic temperature rise will be very high, which exceeds the capacity of the existing catalyst and reactor materials. key technical

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The composition of a methanol purge gas is (V%):

[0017] h 2 : 72.8; CO: 8.5; CO 2 : 10.6; CH 4 : 5.2; Inert gas: 2.9

[0018] With such feed gas composition, if there is no circulation, the adiabatic temperature of methanation will rise above 800°C. In this example, the coke oven gas introduced has the following composition (V%):

[0019] h 2 : 60.2; CO: 7.0; CO 2 : 2.1; CH 4 : 27.6; Inert gas: 3.1

[0020] At the inlet of the primary methanation reactor, methanol purge gas accounts for 50%, coke oven gas accounts for 33%, and water vapor accounts for 17%. After mixing, it enters the primary adiabatic methanation reactor. When the inlet temperature is 250°C, the outlet temperature is ~690°C.

[0021] The tail gas of the primary reaction is supplemented with a certain flow of methanol purge gas, the ratio of the two is 45:55, and after mixing, it enters the secondary methanation reactor. When the inlet temperature is 250°C, the outlet temperature is ~680°C.

...

Embodiment 2

[0029] The purge gas composition of a kind of coke oven gas methanol production is (V%):

[0030] h 2 : 69.8; CO: 9.5; CO 2 : 12.6; CH 4 : 5.2; Inert gas: 2.9

[0031] With such feed gas composition, if there is no circulation, the adiabatic temperature of methanation will rise above 850°C. In this example, the coke oven gas introduced has the following composition (V%):

[0032] h 2 : 60.2; CO: 7.0; CO 2 : 2.1; CH 4 : 27.6; Inert gas: 3.1

[0033] At the inlet of the primary methanation reactor, methanol purge gas accounts for 40%, coke oven gas accounts for 40%, and water vapor accounts for 20%. After mixing, it enters the primary adiabatic methanation reactor. When the inlet temperature is 250°C, the outlet temperature is ~695°C.

[0034] The tail gas of the primary reaction is supplemented with a certain flow of methanol purge gas, the ratio of the two is 50:50, and after mixing, it enters the secondary methanation reactor. When the inlet temperature is 250°C, the...

Embodiment 3

[0041] The composition of a methanol purge gas is (V%):

[0042] h 2 : 72.8; CO: 8.5; CO 2 : 10.6; CH 4 : 5.2; Inert gas: 2.9

[0043] With such feed gas composition, if there is no circulation, the adiabatic temperature of methanation will rise above 800°C. In this example, the coke oven gas introduced has the following composition (V%):

[0044] h 2 : 60.2; CO: 7.0; CO 2: 2.1; CH 4 : 27.6; Inert gas: 3.1

[0045] At the inlet of the primary methanation reactor, coke oven gas accounts for 85% and water vapor accounts for 15%. After mixing, it enters the primary adiabatic methanation reactor. When the inlet temperature is 250°C, the outlet temperature is ~610°C.

[0046] The tail gas of the primary reaction is supplemented with a certain flow of methanol purge gas, the ratio of the two is 40:60, and after mixing, it enters the secondary methanation reactor. When the inlet temperature is 250°C, the outlet temperature is ~680°C.

[0047] The tail gas from the secondary...

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Abstract

The invention discloses a method for producing synthetic natural gas by using methanol purge gas, which belongs to the technical fields of coal chemical industry and new energy. This method of producing synthetic natural gas uses a multi-stage adiabatic methanation reactor, the inlet feed gas of the first adiabatic reactor is a mixture of methanol purge gas and coke oven gas, and the inlet feed gas of the second adiabatic reactor is The mixed gas of methanol purge gas and primary outlet gas undergoes three or more stages of reaction, and the CO and CO2 in the raw material gas are completely converted into methane through methanation reaction. The advantages of this method are: (1) No need for circulation equipment, saving investment and reducing operating costs; (2) All adiabatic reactors are used, with multi-stage series connection, high reaction space velocity and high grade of by-product steam.

Description

technical field [0001] The invention relates to a method for producing synthetic natural gas by using methanol purge gas, belonging to the technical fields of coal chemical industry and new energy. Background technique [0002] Natural gas is recognized as a clean energy, which is convenient to transport and use, and its consumption is increasing, while natural gas resources are becoming less and less. to contain H 2 , CO, CO 2 The production of synthetic natural gas (or alternative natural gas) through methanation and other processes is a very good supplementary way to the supply of natural gas, especially suitable for my country's resource characteristics of "rich in coal, short of oil, and low in gas". [0003] Methanation is a chemical reaction in which carbon monoxide, carbon dioxide and hydrogen react to form methane. It is a strong exothermic reaction. In order to efficiently use this part of heat energy, a high-temperature adiabatic reactor is generally used to pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08
Inventor 周焕文唐恒然童景超
Owner 大连瑞克科技股份有限公司
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