Isothermal methanation process method for coal to substitute natural gas

A technology of coal-to-natural gas and process method, which is applied in the application field of coal-to-natural gas to achieve the effect of reducing operating costs, lowering the maximum operating temperature, and saving equipment construction

Inactive Publication Date: 2012-12-19
EAST CHINA ENG SCI & TECH
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Problems solved by technology

[0022] The purpose of the present invention is to provide a high-concentration CO methane catalyst that can not only solve the high-temperature operation of high-concentration CO methanation and the risk of over-temperature in methanation, but also prolong the service life of the methanation catalyst. isothermal methanation process

Method used

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  • Isothermal methanation process method for coal to substitute natural gas

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Embodiment

[0040] as attached figure 1 As shown, the method of the embodiment of the present invention is mainly completed by the following system, which mainly includes: (a) a fine desulfurization tank for controlling the total sulfur content in the reaction raw material gas; (b) a preheating tank for the reaction raw material gas Feed gas preheater; (c) an isothermal methanation reactor as the main reactor; (d) a steam superheater for high pressure steam superheating and medium pressure steam for controlling the inlet gas temperature of the second methanation reactor Waste pot; (e) an adiabatic methanation reactor for controlling CO content in product natural gas.

[0041] The isothermal methanation process of coal-to-natural gas is carried out in the following steps:

[0042] The purified synthetic gas from the upstream is sent to the feed gas preheater to exchange heat with the hot gas from the outlet of the adiabatic methanation reactor, and then preheated to 280°C. The preheated g...

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Abstract

The invention discloses an isothermal methanation process method for coal to substitute natural gas. Specifically, upstream purified synthetic gas enters one or more methanation reactors after fine desulfurization for undergoing a methanation reaction, and two-stage methanation is adopted in the methanation reactor(s). At a first stage, methanation is performed in one or more isothermal methanation reactors; and at a second stage, methanation is performed in a heat-insulated methanation reactor. The isothermal methanation process method has the advantages of saving in energy, environment friendliness, small investment and easiness in localization.

Description

technical field [0001] The invention belongs to the technical field of coal-to-natural gas application, and in particular relates to an isothermal methanation process for coal-to-natural gas. Background technique [0002] The characteristics of China's resource endowment are "rich in coal, short of oil and low in gas". The three major economic belts around the Bohai Sea, the Yangtze River Delta and the Pearl River Delta have a huge demand for natural gas, while Inner Mongolia and Xinjiang are rich in coal resources, but the transportation costs are high. Therefore, the in-situ conversion of coal resources in coal-rich areas into natural gas has become another important strategic choice after coal power generation, coal-to-oil, and coal-to-olefins. [0003] In recent years, with the vigorous development of the coal chemical industry and the substantial increase in natural gas consumption, my country's coal-to-natural gas industry has made great progress and has become a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08
Inventor 胡文生
Owner EAST CHINA ENG SCI & TECH
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