Method for synchronous implementation of methanation of coke oven gas and in-situ purification of marsh gas

Abstract

The invention relates to a method for synchronous implementation of methanation of coke oven gas and in-situ purification of marsh gas. The method comprises the following steps: (a) introducing the coke oven gas and organic wastes into an anaerobic reactor; (b) in the anaerobic reactor, degrading the organic wastes with microbes to generate CH4 and CO2, enabling produced CO2 to combine with H2 in the coke oven gas to generate CH4 under the action of the microbes, and reacting CO and CO2 in the coke oven gas with H2 to generate CH4 to get the marsh gas which mainly contains CH4; and (c) separating and removing impurities in the marsh gas obtained in the step (b) to get natural gas with high content of methane. Compared with the prior art, according to the method disclosed by the invention, a microbial process is adopted for introducing the coke oven gas into the anaerobic reactor, the in-situ purification of the marsh gas is simultaneously implemented during the preparation of the natural gas, a catalyst is not required, high temperature and high pressure are not required, and most of components except methane in the coke oven gas and the marsh gas can be converted to methane, so that the new method is provided for solving the problems of shortage of resources, environmental pollution, unreasonable energy structure and the like in the energy field in China.

Description

technical field

[0001] The invention relates to comprehensive utilization of coking industrial by-products and biogas purification, in particular to a method for synchronously realizing methanation of coke oven gas and in-situ purification of biogas. Background technique

[0002] Due to the advantages of high load, low energy consumption, low operating cost, and energy generation, the anaerobic digestion process is widely used in high-concentration organic wastewater (distiller's grains, landfill leachate, etc.), organic waste (sludge, cow dung, straw, etc.) processing. The main component of the biogas produced by the anaerobic digestion process is 50-70% methane (CH 4 ), 30-50% carbon dioxide (CO 2 ) and a small amount of hydrogen sulfide (H 2 S), water (H 2 O), ammonia nitrogen (NH 3 ), hydrogen (H 2 ) and carbon monoxide (CO), etc., are a sustainable and valuable source of energy. Untreated ordinary biogas has low energy density and generally has a calorific value ...

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