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Novel process for preparing methane from high energy-efficiency synthetic gas

A technology for synthesis gas and methane production, which can be used in the production of hydrocarbons from carbon oxides, organic chemistry, etc., and can solve the problems of economic loss, high cost, and harsh process conditions.

Active Publication Date: 2009-10-21
ENN XINNENG BEIJING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, the process of producing methane from syngas is relatively mature, but they all have more or less problems such as not making full use of energy, causing certain economic losses, high cost, and harsh process conditions.

Method used

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Experimental program
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Effect test

Embodiment 1

[0031] Use CO 2 A new process for producing methane from high-energy-efficiency synthesis gas as an inert gas for the reaction, with a synthesis gas flow rate of 400Nm 3 / h, access CO 2 The flow rate is 353Nm 3 / h, output methane 100Nm 3 / h.

[0032] The inlet temperature of the high-temperature reactor is 240°C, the reaction temperature is 720°C, and the reaction pressure is 5MPa. Under thermodynamic control, the corresponding high-temperature reactor outlet CO content is 7.5%. The gas containing CO 7.5% enters the middle temperature reactor in the next stage, the inlet temperature is 260°C, and the reaction temperature is 370°C. At this reaction temperature, the corresponding middle temperature reactor outlet CO+CO 2 The content is below 0.2%. In the first stage of the reaction, the by-product superheated steam pressure is 10MPa, the temperature is 550℃, the flow rate is 122.6kg / h, the by-product high pressure steam pressure is 10MPa, the temperature is 500℃, the flow rate is 28...

Embodiment 2

[0034] A new process for producing methane from high-energy-efficiency syngas with added steam, with a syngas flow rate of 400Nm 3 / h, the steam flow rate is 368Nm 3 / h, output methane 100Nm 3 / h.

[0035] The inlet temperature of the high-temperature reactor is 240°C, the reaction temperature is 710°C, and the reaction pressure is 4MPa. Under thermodynamic control, the corresponding high-temperature reactor outlet CO content is 7.3%. The gas containing 7.3% CO enters the middle temperature reactor in the next stage, the inlet temperature is 270℃, and the reaction temperature is 380℃. At this reaction temperature, the corresponding middle temperature reactor outlet CO+CO 2 The content is below 0.2%. In the first stage of the reaction, the by-product superheated steam pressure is 10MPa, the temperature is 540℃, the flow rate is 94.3kg / h, the by-product high pressure steam pressure is 10MPa, the temperature is 490℃, the flow rate is 254.6kg / h, and the by-product heat is The water te...

Embodiment 3

[0037] A new process for producing methane from high-energy-efficiency syngas using water as the coolant. The amount of coolant is 136.4kg / h and the flow rate of syngas is 400Nm. 3 / h, output methane 100Nm 3 / h.

[0038] The inlet temperature of the high-temperature reactor is 250°C, the reaction temperature is 710°C, and the reaction pressure is 4MPa. Under thermodynamic control, the CO conversion rate is 81%, and the corresponding high-temperature reactor outlet CO content is 8%. The gas containing CO8% enters the middle temperature reactor at the next stage, the inlet temperature is 220℃, and the reaction temperature is 440℃. At this reaction temperature, the corresponding middle temperature reactor outlet CO+CO 2 The content is below 0.2%. In the first stage of the reaction, the by-product superheated steam pressure is 10MPa, the temperature is 560℃, the flow rate is 18.6kg / h, the by-product high pressure steam pressure is 10MPa, the temperature is 500℃, the flow rate is 47.2k...

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Abstract

The invention provides a novel process for preparing methane from high energy-efficiency synthetic gas. The technology is characterized in that the process controls the reaction temperature of synthetic methane in a first section high temperature reactor through various means and allows the temperature to be high as possible in the range allowed by thermodynamics; therefore, the process recycles heat energy discharged by the reaction at high efficiency, can control the CO content of an outlet reactor of the high-temperature reactor so that the reaction temperature of the first section high temperature reactor and the reaction temperature of a second section intermediate temperate reactor meet the requirement of thermodynamics; and the process utilizes the heat exchange between low-temperature reaction gas and a catalyst bed layer to control the reaction temperature and ensures the material conversion ratio as high as possible.

Description

Technical field [0001] The invention relates to the field of methane production from syngas, and particularly relates to a new process for efficiently recovering and utilizing the heat produced in the methane production process. Background technique [0002] Methanation technology was first applied in the synthetic ammonia process to remove CO and CO in the feed gas 2 In the 1940s, foreign countries paid great attention to the research on the production of qualified natural gas and city gas by methanation. In the early 1970s, domestic and foreign researches on substituting coal and naphtha for natural gas were conducted, and a series of technological processes were developed. How to efficiently recover and utilize a large amount of heat energy released by the strong exothermic reaction has become a hot spot for research and development. [0003] Denmark The patent US4130575 applied by the company uses multiple reactors connected in series. These reactors are all high-temperature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C9/04C07C1/04
Inventor 常俊石郭迎秋张建祥田文堂张梅香蒋建明宋欢芳次东辉李欢张宝树于建涛
Owner ENN XINNENG BEIJING TECH
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