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Method of producing substitute natural gas by methanation of synthesis gas

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

Active Publication Date: 2014-04-23
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

[0034] 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 )=3.1, 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

[0038] A certain 1.2 billion Nm 3 / year synthetic gas to replace natural gas plant (8000 operating hours per year), usingfigure 1 process technology, the composition of raw syngas is: (H 2 -CO 2 ) / (CO+CO 2 ) = 3.2, 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 320°C and a pressure of 4.5 MPa to undergo methanation reaction, the volume of the recycle 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 CO 2 The gas volume is 12000Nm 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 0.055, and all the other conditions are the same as [e...

Embodiment 3

[0042] 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 ) = 3.1, 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 tempe...

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Abstract

The invention relates to a method of producing substitute natural gas by methanation of synthesis gas, mainly solving problems, namely large using amount of recycle gas, high energy consumption of compressors, and excess of the H2 component or the CO2 component in substitute natural gas products, of high-temperature methanation reactions in the prior art. According to the technical scheme adopted by the method, the method comprises: a) a step of providing a high-temperature methanation reaction zone including n-stage series-connected reactors; b) a step of dividing the synthesis gas raw materials into n sections and respectively feeding the n sections of the synthesis gas raw materials into inlets of the reactors at all stages in the high-temperature methanation reaction zone, wherein the stream Vn flowing out from the reactor at the final stage is divided into Vn' and Vn'' and the stream Vn' is condensed and circulated to the inlet of the reactor at the first stage; c) a step of providing a low-temperature methanation reaction zone including m-stage series-connected reactors; and d) a step of supplementing a stream I containing CO2 to a reactor at any stage in the low-temperature methanation reaction zone, and a substitute natural gas product is obtained after the reaction. By the technical scheme, the problems are solved well and the method can be used in industrial production of the substitute natural gas from 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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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08
Inventor 刘文杰郭毅张洪宇黄云群
Owner CHINA PETROLEUM & CHEM CORP
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