Method of producing substitute natural gas from synthesis gas

A technology that replaces natural gas and synthetic gas. It is applied in the direction of gas fuel, petroleum industry, fuel, etc. It can solve the problems of excess components, etc., and achieve the effects of high-grade product rate improvement, good technical effect, and short reaction process.

Inactive 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

[0012] The technical problem to be solved by the present invention is to replace H2 in natural gas (SNG) by prior art products 2 or CO 2 The problem of excess components, providing a new method of producing natural gas from synthesis gas

Method used

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  • Method of producing substitute natural gas from synthesis gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 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 )=3.05, the pressure is 3.5MPa, and the feed rate is 600,000 Nm 3 / h, the stream 4 mixed with the recycle gas 8 enters the high-temperature methanation reactor 101 at a temperature of 300°C to undergo a methanation reaction, and the methanation reactor is filled with a Ni-based catalyst (wherein Al 2 o 3 Carrier 60%, nickel 35%); reaction outlet stream 5 temperature 650°C, after being cooled by high-temperature methanation reactor outlet cooler 105, it is divided into 2 shares, the volume ratio of stream 5 and stream 8 is 1.4, and material 8 is circulated The gas cooler 107 is cooled and the circulation compressor 110 is compressed to 3.5 MPa, and then mixed with the synthesis gas as the circulation gas, and the circulation compressor adopts a centrif...

Embodiment 2

[0032] With [embodiment 1], only raw material synthesis gas 1 is formed into: (H 2 -CO 2 ) / (CO+CO 2 )=3.2, add CO 2 The gas volume is 12000Nm 3 / h, the volume ratio of stream 13 to stream 10 is 0.035.

[0033] The volume content of each component of natural gas produced by the device is: CH 4 95.6%, H 2 0.8%, CO 2 1.8%, N 2 1.8%, the high-temperature methanation reaction CO conversion rate is 71%, the energy consumption of the compressor is 4900KW, and the high-grade product rate is 97.5%.

[0034]

Embodiment 3

[0036] 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, stream 13 is composed of H 2 : 17%, CO: 3%, CO 2 : 80% mixed gas, additional gas volume is 10000Nm 3 / h, the volume ratio of logistics 13 and logistics 10 is 0.03, and all the other conditions are the same as [embodiment 1].

[0037] The volume content of each component of natural gas produced by the device is: CH 4 95%, H 2 1.0%, CO 2 2.2%, N 2 1.8%, the high-temperature methanation reaction CO conversion rate is 70%, the energy consumption of the compressor is 4800KW, and the high-grade product rate is 97%.

[0038]

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PUM

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Abstract

The invention relates to a method of producing substitute natural gas from synthesis gas, mainly solving a problem of excess of the H2 component or the CO2 component in substitute natural gas (SNG) which is a technical product in the prior art. According to the technical scheme adopted by the method, the method comprises: a) a step of feeding synthesis gas raw materials containing H2, CO, CO2 and H2O into an inlet of a high-temperature methanation reactor, wherein the reacted stream V is divided into V' and V'' and the V' stream is compressed and circulated to the inlet of the high-temperature methanation reactor; b) a step of feeding the stream V'' into a low-temperature methanation unit including m-stage series-connected reactors with the m being not less than 2; and c) a step of supplementing a stream I containing CO2 to a reactor at any stage in the low-temperature methanation unit; a substitute natural gas product is obtained after the reaction, wherein the stream I comprises 40-100% in volume of the CO2, 0-60% in volume of H2 and 0-20% in volume of CO. By the technical scheme, the problem is 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 natural gas substitutes from synthesis gas. Background technique [0002] Natural gas is an efficient and clean energy that can make up for the increasing shortage of 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 China's natural gas demand in 2015 will Will reach 170-210 billion Nm 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 f...

Claims

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Application Information

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