Circulation-free methanation system

A methanation, non-circulating technology, applied in the field of methanation reaction, can solve the problems of high investment, increased feed flow rate of the reactor, unfavorable installation and disassembly, etc., and achieves simplified process system, stable reaction operation, operating cost and construction cost. low effect

Active Publication Date: 2015-01-28
BEIJING HUAFU ENG +2
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Problems solved by technology

The cyclic methanation process has at least the following disadvantages: (1) Due to the increase of the feed flow rate of the reactor, the reaction driving force decreases, and the catalyst loading will increase significantly
(2) It is necessary to use a circulating gas compressor, which is difficult to manufacture and requires high investment
(3) Using circulation to control the temperature of the methanation reaction, there is a possibility of overheating
But the high-temperature reactor in the prior art also has at least the following disadvantages: (1) the refractory lining of the existing high-temperature reactor usually has a considerable thickness, which makes the overall volume of the existing high-temperature reactor larger, which is unfavorable for installation , Disassembly
(2) After being subjected

Method used

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  • Circulation-free methanation system

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Embodiment

[0040] Specifically, if the non-cycle methanation system in this embodiment is used to produce methane, the detailed process is as follows:

[0041] Process gas flow:

[0042] Raw material rich H 2 The gas is mixed with a small amount of CO-rich gas and an appropriate amount of steam, enters the first-stage reactor R1 from the bottom, and flows upward along the gap gas flow channel to the upper part of the reactor inner cylinder. In the interstitial air flow channel, the synthesis gas exchanges heat with the inner tube of the reactor and the water-cooled tube, so that the synthesis gas can enter the catalyst bed from the top or side wall of the inner tube of the reactor at a relatively constant temperature. Catalytic reaction occurs. After the reaction, the product gas at about 700°C (less than 800°C) enters the heat exchange section of the lower part of the reactor. After heat exchange with boiler water, the temperature of the generated gas drops to about 270°C (at least above 200...

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Abstract

The invention discloses a circulation-free methanation system which comprises a gas distribution methanation stage and a supplementation methanation stage, wherein in the gas distribution methanation stage, 1 to 3 stages of serially connected high-temperature reactors are adopted; in the supplementation methanation stage, 2 to 3 stages of serially connected low and medium-temperature reactors are adopted; the final-stage reactor in the gas distribution methanation stage is connected in series with the head-stage reactor in the supplementation methanation stage; technical gas discharged by the former stage of the reactor is used as part of or all the synthesized gas of the next stage of the reactor; technical gas discharged by the final-stage reactor is subjected to cooling separation to obtain a final methane product. The technical system is simple, and the reaction is steady, safe and reliable; the running cost and the manufacturing cost are low.

Description

Technical field [0001] The invention relates to a methanation reaction technology, in particular to a non-circulation methanation system. Background technique [0002] Methanation reaction is CO, CO 2 And H 2 A strong exothermic reaction at a certain temperature (a strong exothermic reaction usually refers to a reaction with an enthalpy greater than 200kJ / mol). Under the usual synthesis gas composition, each percentage of CO methanation can produce 74℃ adiabatic Temperature rise, every percentage point of CO 2 Methanation can produce an adiabatic temperature rise of 60°C. Limited by the operating temperature zone of the catalyst, the current industrialized methanation generally has a temperature resistance of 650-750°C. Therefore, how to effectively control the reaction heat release and quickly transfer heat to maintain the normal operation of the reaction is the focus of the research and development of large-scale methanation processes. At present, most of the methanation plan...

Claims

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Application Information

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IPC IPC(8): C10L3/08
Inventor 汪勤亚刘廷斌王志远周焕文王正忠杨利国牛玉梅赵正绪彭良华兰玉顺李会张欢迎陈兆文杨洪文戴伟曹立军
Owner BEIJING HUAFU ENG
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