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Method and device for producing synthetic natural gas

A technology for synthesizing natural gas and product gas, applied in gas fuel, petroleum industry, fuel and other directions, can solve the problems of unfavorable reaction and equipment strengthening, low methane concentration, low carbon conversion rate, etc., to improve energy utilization efficiency and reasonable process flow , the effect of reducing system energy consumption

Active Publication Date: 2014-02-05
DATANG INT CHEM TECH RESINST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The main problems of coal hydrogasification to produce methane are: low carbon conversion rate, low methane yield, complex gas composition, low methane concentration, and lack of high-quality synthetic natural gas, etc.
Domestic methanation technology currently only stays at partial methanation, and the catalyst has a narrow temperature range, which greatly limits the comprehensive utilization efficiency of energy; in addition, partial methanation technology under normal pressure is not conducive to reaction and equipment strengthening, and lacks reactor design and matter-energy integrated optimization

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  • Method and device for producing synthetic natural gas
  • Method and device for producing synthetic natural gas
  • Method and device for producing synthetic natural gas

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Embodiment 1

[0043] This embodiment is a preferred implementation of the method for producing synthetic natural gas provided by the present invention, and the process flow diagram of this embodiment is as follows figure 1 shown.

[0044] a) Coal or biomass passes through the gasification unit, conversion unit and purification unit to obtain raw material gas that meets the requirements. Raw material gas 1 is heated to 210-230° C. through first heat exchange device 2 to obtain heated raw material gas 3 . The heated raw material gas 3 is divided into four streams, namely: the first raw material gas 4 , the second raw material gas 5 , the third raw material gas 6 and the fourth raw material gas 7 .

[0045] b) Mix the first raw material gas 4 with the first steam 37 and the pressurized recycle gas 19 to obtain the first mixed gas 8 with a temperature of 280~300°C, and pass it into the first-stage methanation reactor 9 The methanation reaction is carried out in the medium to obtain the first-...

Embodiment 2

[0058] This embodiment is a preferred implementation of the method for producing synthetic natural gas provided by the present invention, and the process flow diagram of this embodiment is as follows figure 2 shown.

[0059] a) Coal or biomass passes through the gasification unit, conversion unit and purification unit to obtain raw material gas that meets the requirements. Raw material gas 1 is heated to 190-210° C. through first heat exchange device 2 to obtain heated raw material gas 3 . The heated raw material gas 3 is divided into four streams, namely: the first raw material gas 4 , the second raw material gas 5 , the third raw material gas 6 and the fourth raw material gas 7 .

[0060] b) Mix the first raw material gas 4 with the first steam 37 and the pressurized recycle gas 19 to obtain the first mixed gas 8 with a temperature of 280~300°C, and pass it into the first-stage methanation reactor 9 The methanation reaction is carried out in the medium to obtain the first...

Embodiment 3

[0073] This embodiment is a preferred implementation of the method for producing synthetic natural gas provided by the present invention, and the process flow diagram of this embodiment is as follows figure 1 shown.

[0074] a) Coal or biomass passes through the gasification unit, conversion unit and purification unit to obtain raw material gas that meets the requirements. Raw material gas 1 is heated to 210-230° C. through first heat exchange device 2 to obtain heated raw material gas 3 . The heated raw material gas 3 is divided into four streams, namely: the first raw material gas 4 , the second raw material gas 5 , the third raw material gas 6 and the fourth raw material gas 7 .

[0075] b) Mix the first raw material gas 4 with the first steam 37 and the pressurized recycle gas 19 to obtain the first mixed gas 8 with a temperature of 290~310°C, and pass it into the first-stage methanation reactor 9 The methanation reaction is carried out in the medium to obtain the first-...

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Abstract

The invention provides a method and a device for producing a synthetic natural gas. The invention is a continuous process that coal or biomass gasification products are used as raw materials to produce a methane-rich gas containing methane with the molar percent of more than 94%. According to the production process provided by the invention, the operating temperature of a methanation reactor can be better controlled, and the temperature runaway sintering problem of catalysts caused by larger raw material fluctuation or accidents is avoided; and a methanation reaction exothermic utilization system is provided, and the comprehensive energy utilization efficiency is improved.

Description

technical field [0001] The invention relates to a method and device for producing synthetic natural gas, in particular to a method and device for producing synthetic natural gas by using coal or biomass gasification products as raw materials, and belongs to the technical field of synthetic natural gas. Background technique [0002] Since the 1970s, along with the oil crisis, coal-to-methane (synthetic natural gas or alternative natural gas) has developed rapidly. The main methods of coal-to-methane include direct production of methane by coal hydrogasification and indirect production of methane through synthesis gas. [0003] The main problems of coal hydrogasification to produce methane are: low carbon conversion rate, low methane yield, complex gas composition, low methane concentration, and lack of high-quality synthetic natural gas. Relatively speaking, the process of producing methane from coal through syngas has significant advantages of high technological maturity, h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/08
Inventor 李安学李春启左玉帮刘永健丁万友余铭程刘学武梅长松孔凡贵刘佳男
Owner DATANG INT CHEM TECH RESINST