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Synthesis gas methanation reaction method

A methanation reactor and methanation reaction technology, which is applied in the direction of gas fuel, petroleum industry, fuel, etc., can solve the problems of complex process, low conversion rate of methanation reaction, and many heat exchange equipment

Active Publication Date: 2015-02-11
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is the problems of low methanation reaction conversion rate, many heat exchange equipment, complicated process and high energy consumption of compressors existing in the previous syngas-to-SNG technology, and a new syngas-to-SNG method is provided. The method has the advantages of high methanation reaction conversion rate, less heat exchange equipment, simple flow process and low compressor energy consumption

Method used

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Embodiment 1

[0022] 2 billion Nm 3 / year synthetic gas methanation to substitute natural gas plant (annual operating hours 8,000 hours), using figure 1 With advanced technology, the raw syngas is divided into three shares evenly at a pressure of 3.3MPa and a temperature of 30°C. The circulating gas from the compressor has a pressure of 3.3MPa and a temperature of 49°C. It is divided into three streams according to the ratio of 4:4:2, and is mixed with the raw material synthesis gas to enter the third-stage catalyst bed of the fixed-bed reactor, so that the temperature of the mixed gas entering the middle-stage catalyst bed is The temperature of the mixed gas entering the lower catalyst bed is 438°C. The mixed gas entering the upper catalyst bed first exchanges heat with the reaction gas in the heat exchanger, and then rises to 300°C before entering the catalyst bed. After the reaction product comes out of the reactor at 552°C, heat the mixed gas as mentioned above, the temperature of the ...

Embodiment 2

[0024] 2 billion Nm 3 / year synthetic gas methanation to replace natural gas installations, using figure 1 The process technology, the reaction gas is divided into two streams, 11% of the reaction gas is used as the feed of the lower methanation reactor, and 89% of the reaction gas is used as the cycle gas to mix with the raw synthesis gas. The temperature of the mixed gas entering the middle catalyst bed is 323°C, the temperature of the mixed gas entering the lower catalyst bed is 406°C, and the temperature of the methanation reaction gas product is 510°C. Other conditions are with embodiment 1. The conversion rate of the methanation reaction of this device is 77.0%, and the energy consumption of the compressor is 6585KW.

Embodiment 3

[0026] 2 billion Nm 3 / year synthetic gas methanation to replace natural gas installations, using figure 1 The raw material synthesis gas is divided into three shares on average at 5.5MPa and 20°C, and the circulating gas exits the compressor at a temperature of 25°C and a pressure of 5.5MPa. For each catalyst bed in the fixed-bed reactor, the temperature of the mixed gas entering the middle catalyst bed is 379°C, the temperature of the mixed gas entering the lower catalyst bed is 448°C, and the product temperature of the methanation reactor is 567°C. Other processing conditions are with embodiment 1.

[0027] The conversion rate of the methanation reaction of this device is 73.2%, and the energy consumption of the compressor is 2996KW.

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Abstract

The invention relates to a synthesis gas methanation reaction method, which mainly solves the problems in the prior art of low conversion rate of methanation reaction, many heat exchange equipment, complicated process and high energy consumption of compressors. The invention comprises the following steps: At 3.0~5.5MPa, 20~60℃, the synthesis gas is divided into multiple streams and mixed with the circulating gas from the methanation reactor, and then passed into each bed layer of the multi-stage fixed-bed reactor equipped with methanation catalyst to control the mixing. The gas is mixed with the reaction gas from each catalyst bed and the temperature is 300~400°C; the composition of the reactor outlet gas is CH4, H2O and unconverted CO, CO2, H2; the mixed gas and methane entering the first catalyst bed 2) The outlet gas of the methanation reactor is divided into two parts, one part is used as the recycle gas mentioned above; the other part enters the next-stage methanation reactor. The problem is well solved, and it can be used in the industrial production of synthetic gas instead of natural gas.

Description

technical field [0001] The invention relates to a method for producing substitute natural gas (SNG) by methanation of synthesis gas. Background technique [0002] Natural gas is a low-pollution, high-calorific-value clean energy that can make up for the increasingly scarce oil resources to a certain extent. However, my country's natural gas reserves are small and the demand for natural gas is growing rapidly. It is estimated that my country's current natural gas gap is about 20 billion m3 . my country is rich in coal resources, so the methanation of synthetic gas from coal gasification to substitute natural gas (SNG) can effectively alleviate my country's demand for natural gas. [0003] The main components of syngas are CO, CO 2 and H 2 , a large amount of methane is produced through the methanation reaction, and the reaction equation is: [0004] [0005] The methanation reaction is a strongly exothermic reaction, depending on the initial methane content, the single-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/08
Inventor 刘文杰郭毅
Owner CHINA PETROLEUM & CHEM CORP