Method of producing substitute natural gas from synthesis gas

A technology to replace natural gas and synthesis gas, 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

Active Publication Date: 2014-04-23
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 instead of natural 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

[0029] One billion Nm 3 / Year synthesis gas to replace natural gas plant (annual operating hours of 8000 hours), using figure 1 The high-temperature methanation reaction zone has two stages, and the reactors are filled with Ni-based catalysts (including Al 2 O 3 Carrier 60%, nickel 35%). Entrance of the primary reactor (H 2 -3CO) / CO 2 =4, the pressure is 3.5MPa, and the feed volume is 500,000 Nm 3 / h. The raw material synthesis gas 1 is 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 mixed stream 4 of the first-stage synthesis gas 2 and the circulating gas 8 enters the first-stage high temperature at a temperature of 300℃ Methanation reaction occurs in the methanation reactor 101, the volume ratio of the circulating gas 8 to the first-stage synthesis gas 2 is 2.4:1; the reaction outlet stream 5 has a temperature of 650°C, and is cooled by the first-stage high-temperature methanation reactor outlet coole...

Embodiment 2

[0033] One billion Nm 3 / Year synthesis gas to replace natural gas plant (annual operating hours of 8000 hours), using figure 1 The process technology of the first-level synthesis gas 2 and the recycle gas 8 is mixed, and the stream 4 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 recycle gas 8 and the first-stage synthesis gas 2 The volume ratio is 2:1, the reaction outlet stream 5 has a temperature of 700°C, the secondary high temperature methanation reactor 102 has an inlet temperature of 320°C, an outlet temperature of 700°C, and a pressure of 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 the natural gas product of the device is: CH 4 95%, H 2 0.8%, CO 2 2.5%, N 2 1.7%, the high temperature methanat...

Embodiment 3

[0037] One billion Nm 3 / Year synthesis gas to replace natural gas plant (annual operating hours of 8000 hours), using figure 1 The process technology of the raw material synthesis gas 1 has a pressure of 5.0MPa, which is divided into two parts. The ratio of the first-stage synthesis gas 2 and the second-stage synthesis gas 3 is 1:1, and the volume ratio of the circulating gas 8 and the first-stage 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 methanation reaction, and the reaction outlet stream 5 has a temperature of 640°C and undergoes a first-stage high-temperature methanation reaction. After cooling 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. The temperature of the reaction outlet stream 7 is...

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Abstract

The invention relates to a method of producing substitute natural gas from synthesis gas, mainly solving problems, namely large using amount of recycle gas and high energy consumption of compressors, 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, with the n being not less than 2; b) a step of dividing the synthesis gas raw materials containing H2, CO, CO2 and H2O 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; c) a step of allowing a stream flowing out of an outlet of each of the reactors except the reactor at the final stage to enter the inlet of the reactor at the next stage; and d) a step of shunting the stream Vn flowing out from the reactor at the final stage to obtain a part Vn', circulating the stream Vn' after the Vn' is condensed to the inlet of the reactor at the first stage, and feeding the rest of the stream into subsequent processes. By the technical scheme, the problems are solved well and the method can be used in industrial production of substitute natural gas from synthesis gas.

Description

Technical field [0001] The present invention relates to a method for replacing natural gas (SNG) with 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, my country's natural gas demand has grown rapidly in recent years, and my country's natural gas reserves are relatively small. It is predicted that China's natural gas demand 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 ~ 70 billion Nm 3 . In order to solve the contradiction between my country's natural gas supply and demand, other alternative ways must be sought. [0003] my country is rich in coal resources, so the method of methanizing synthesis gas from coal gasification to substitute natural gas (SNG) can effectively alleviate my country's demand for natural gas. ...

Claims

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Application Information

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