Method for producing substitute natural gas

A technology to replace natural gas and synthesis gas, applied in gas fuel, petroleum industry, fuel, etc., can solve the problems of large amount of circulating gas, excess components, and high energy consumption of compressors, and achieve reduced circulating gas volume, short reaction process, and energy consumption. reduced effect

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

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Problems solved by technology

[0014] The technical problem to be solved by the present invention is that in the prior art, there is a large amount of high-temperature methanation reaction cycle gas, high energy consumption of the compressor, and the product replaces H in natural gas. 2 or CO 2 The problem of excess components provides a new method for the methanation of syngas to produce alternative natural gas

Method used

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Embodiment 1

[0044] A certain 1.2 billion Nm 3 / year synthetic gas to replace natural gas plant (8000 operating hours per year), using figure 1 The high-temperature methanation and low-temperature methanation reaction zones are both two-stage, and the catalysts loaded therein are all Ni-based catalysts (where Al 2 o 3 Carrier 60%, Nickel 35%). The composition of raw syngas 1 is: (H 2 -CO 2 ) / (CO+CO 2 )=2.80, pressure 3.5MPa, feed rate 600,000 Nm 3 / h, divided into two parts, the ratio of the first-stage synthesis gas 2 and the second-stage synthesis gas 3 is 1:1.5, and the stream 4 after the first-stage synthesis gas 2 and the cycle gas 8 is mixed enters the first-stage high-temperature methanation reaction at a temperature of 300°C The methanation reaction occurs in the reactor 101, the volume ratio of the recycle gas 8 and the first-stage synthesis gas 2 is 2.4:1, the temperature of the reaction outlet stream 5 is 650°C, and after cooling by the outlet cooler 105 of the first-stage...

Embodiment 2

[0048] A certain 1.2 billion Nm 3 / year synthetic gas to replace natural gas plant (8000 operating hours per year), using figure 1 process technology, the composition of raw syngas is: (H 2 -CO 2 ) / (CO+CO 2 )=2.9, the mixed stream 4 of the first-stage synthesis gas 2 and the first-stage synthesis gas 8 enters the first-stage high-temperature methanation reactor 101 at a temperature of 320°C and a pressure of 4.5 MPa to undergo methanation reaction, and the volume of the first-stage synthesis gas 8 and the first-stage synthesis gas 2 The 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, the pressure is 4.2 MPa, and H 2 The gas volume is 18000Nm 3 / h, the volume ratio of material 7 and material 8 is 1.53, the volume ratio of material 5 and material 3 is 1.65, the volume ratio of material 13 and material 10 is 0.16, and all the other...

Embodiment 3

[0051] A certain 1.2 billion Nm 3 / year synthetic gas to replace natural gas plant (8000 operating hours per year), using figure 1 process technology, the composition of raw material synthesis gas 1 is: (H 2 -CO 2 ) / (CO+CO 2 ) = 2.85, pressure 5.0MPa, divided into two parts, the ratio of the first-stage synthesis gas 2 and the second-stage synthesis gas 3 is 1:1, the volume ratio of the recycle gas 8 and the first-stage synthesis gas 2 is 2:1, and the first-stage synthesis gas 2 The stream 4 mixed with the circulating gas 8 enters the first-stage high-temperature methanation reactor 101 at a temperature of 290°C to undergo a methanation reaction, and the temperature of the reaction outlet stream 5 is 640°C, and is cooled by the outlet cooler 105 of the first-stage high-temperature methanation reactor , the material 6 mixed with the second-stage synthesis gas 3 enters the secondary high-temperature methanation reactor 102 at 300°C, and the reaction outlet stream 7 has a temp...

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Abstract

The invention relates to a method for producing substitute natural gas. The problems of large using amount of high-temperature methanation reaction circulating gas, high energy consumption of a compressor and excess of an H2 or CO2 component in a substitute natural gas product in the prior art are mainly solved. According to the technical scheme, the method comprises the following steps: (a) proving a high-temperature methanation reaction area, wherein the high-temperature methanation reaction area comprises an n stages of cascaded reactors; (b) dividing synthesis gas raw materials into n sections, causing the n sections of synthesis gas raw materials to enter an inlet of a reactor in each stage in the high-temperature methanation reaction area, dividing a material flow Vn flowing out of an outlet of the reactor in a final stage into Vn' and Vn', and compressing and circulating the material flow Vn to an inlet of the reactor in the first stage; (c) providing a low-temperature methanation reaction area, wherein the low-temperature methanation reaction area comprises m stages of reactors which are connected in series; (d) supplementing an H2-containing material flow I into the reactor in any stage of a low-temperature methanation unit, and performing reaction to obtain the substitute natural gas product. According to the method, the problems are well solved; the method can be used for industrial production of preparing the substitute natural gas with synthesis gas.

Description

technical field [0001] The present invention relates to a method of producing alternative natural 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 my country's demand for natura...

Claims

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Application Information

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