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Method for preparing substitutive natural gas by synthesis gas methanation

A technology to replace natural gas and gas methane, applied in gas fuel, petroleum industry, fuel and other directions, can solve the problems of large amount of circulating gas and high energy consumption of compressors

Inactive Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is that the prior art has the problems of large amount of high-temperature methanation reaction cycle gas and high energy consumption of the compressor, and provides a new method for producing synthetic gas methanation to replace natural gas

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1 billion Nm 3 / year synthetic gas to replace natural gas plant (8000 operating hours per year), using figure 1 technology, the high-temperature methanation reaction zone and the low-temperature methanation reaction zone are filled with Ni-based catalysts (in which Al 2 o 3 Carrier 60%, Nickel 35%). The high-temperature methanation reaction zone is divided into two stages, the primary reactor inlet (H 2 -3CO) / CO 2 =4, pressure 3.5MPa, feed rate 500,000 Nm 3 / h, the raw material synthesis gas 1 is divided into two parts, the ratio of the primary synthesis gas 2 and the secondary synthesis gas 3 is 1:1.5, and the stream 4 after the mixing of the primary synthesis gas 2 and the cycle gas 8 enters at a temperature of 300°C The methanation reaction occurs in the primary high-temperature methanation reactor 101, and the volume ratio of the recycle gas 8 and the primary synthesis gas 2 is 2.4:1. The temperature of the reaction outlet stream 5 is 650°C. After being cooled...

Embodiment 2

[0033] 1 billion Nm 3 / year synthetic gas to replace natural gas plant (8000 operating hours per year), using figure 1 process technology, the mixed stream 4 of primary synthesis gas 2 and cycle gas 8 enters the primary high-temperature methanation reactor 101 at a temperature of 320°C and a pressure of 4.5 MPa to undergo methanation reaction, cycle gas 8 and primary synthesis gas 2 The volume ratio is 2:1, the temperature of the reaction outlet stream 5 is 700°C, the inlet temperature of the secondary high-temperature methanation reactor 102 is 320°C, the outlet temperature is 700°C, and the pressure is 4.2 MPa. Other conditions are the same as in [Example 1]. The volume ratio of material 7 to material 8 is 1.53, and the volume ratio of material 5 to material 3 is 1.65.

[0034] The volume content of each component of natural gas produced by the device is: CH 4 95%, H 2 0.8%, CO 2 2.5%, N 2 1.7%, high-temperature methanation reaction CO conversion rate is 74%, the vol...

Embodiment 3

[0037] 1 billion Nm 3 / year synthetic gas to replace natural gas plant (8000 operating hours per year), using figure 1 The raw material synthesis gas 1 has a pressure of 5.0MPa and is divided into two parts. The ratio of the first-level synthesis gas 2 and the second-level synthesis gas 3 is 1:1, and the volume ratio of the recycle gas 8 and the first-level synthesis gas 2 is 2: 1. The mixed stream 4 of the first-stage synthesis gas 2 and the recycle gas 8 enters the first-stage high-temperature methanation reactor 101 at a temperature of 290°C to undergo a methanation reaction, and the reaction outlet stream 5 is subjected to a first-stage high-temperature methanation reaction at a temperature of 640°C After being cooled by the cooler 105 at the outlet of the reactor, the material 6 mixed with the secondary synthesis gas 3 enters the secondary high-temperature methanation reactor 102 at 300°C, and the reaction outlet stream 7 has a temperature of 650°C and a pressure of 4.8 M...

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Abstract

The invention relates to a method for preparing substitutive natural gas by synthesis gas methanation. The method mainly solves the problems that the consumption of high-temperature methanation reaction recycle gas is great and the energy consumption of a compressor is high in the prior art. The method comprises the following steps that a) a high-temperature methanation reaction area is provided; the high-temperature methanation reaction area comprises n reactors connected in series, wherein n is greater than or equal to 2; b) raw synthesis gas containing H2, CO, CO2 and H20 is divided into n sections to enter inlets of the reactors in the high-temperature methanation reaction area respectively; flows flowing out of outlets of the reactors except the last reactor flow into inlets of the next reactors respectively; a flow Vn flowing out of an outlet of the last reactor is divided into Vn' and Vn''; the flow Vn' is compressed and then circulates to the inlet of the first reactor; c) a low-temperature methanation reaction area is provided; the low-temperature methanation reaction area comprises m reactors connected in series, wherein m is greater than or equal to 2; and d) the flow Vn'' enters the low-temperature methanation reaction area to react; and then the substitutive natural gas is obtained. With the adoption of the technical scheme, the problems are solved better, so that the method can be used in industrial production of substitutive natural gas preparation by the synthesis 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 an efficient and clean energy that can make up for the increasingly scarce oil resources to a certain extent. However, in recent years, my country's natural gas demand has grown rapidly, and my country's natural gas reserves are relatively small. It is predicted that the demand for natural gas in China will reach 170-210 billion Nm in 2015 3 , while the natural gas production in the same period can only reach 140 billion Nm 3 , the gap between supply and demand is about 30 billion to 70 billion Nm 3 . In order to solve the contradiction between the supply and demand of natural gas in my country, other alternative ways must be sought. [0003] my country is rich in coal resources, so the methanation of synthetic gas from coal gasification to substitute natural gas (SNG) can effectively alleviate ...

Claims

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Application Information

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IPC IPC(8): C10L3/08
Inventor 刘文杰郭毅黄云群张洪宇张忠群张彬
Owner CHINA PETROLEUM & CHEM CORP
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