Method for generating electricity through extracting extremely low concentration gas from biogas development coal mine

Abstract

The invention relates to a method for generating electricity through extracting extremely low concentration gas from a biogas development coal mine, belongs to the fields of energy development and pollutant emission reduction, and concretely relates to a method for generating electricity through collecting organic wastes surrounding the coal mine, producing biogas from the organic wastes and extracting the extremely low concentration gas (having a CH4 content of 5% or below) The environmental problem caused by direct emission of the extremely low concentration gas due to no effective utilization is mainly solved; and the generated electricity can be used in the coal mine factory, and generated heat can be used for the warming and long-term heating of a biogas fermentation tank, so the economic benefits of biogas development are increased. The method solves the problems of low utilization rate of the extremely low concentration gas, environmental pollution and poor safety of the miningarea, and a system for generating electricity through extracting extremely low concentration gas from the biogas development coal mine has the advantages of simplicity in operation and maintenance, high reliability, obvious energy generation benefit and strong innovation.

Description

Technical field [0001] The invention belongs to the field of energy development and pollutant emission reduction, and specifically relates to a collection of organic wastes around coal mines for biogas production, and mixed extraction of extremely low-concentration gas (CH 4 ≤5%) to generate electricity to reduce environmental problems caused by the ineffective use of direct discharge of extremely low-concentration gas, and to improve the economic benefits of biogas development. Background technique [0002] Gas, also known as coal-bed methane, has huge gas reserves. my country alone has 36 trillion cubic meters of reserves. The annual gas drainage volume of major coal mines exceeds 10 billion cubic meters. However, due to technical limitations, geological conditions and other factors, the current Concentration in coal mine drainage The total emission of low-concentration gas of <10% accounts for a large proportion, exceeding 60%-70%. Among them, there is a large amount of very...

AI Technical Summary

Problems solved by technology

Among them, during the extraction process, there are a large amount of extremely low concentration gas (CH 4 ≤5%), due to its difficulty in utilization and extremely low proportion of utilization, at present the mines mainly discharge directly into the atmosphere, which not only causes a large waste of resources, but also causes great damage to the environment

Existing gas power generation equipment is generally only suitable for mixed gas in the concentration range of 8% to 30%. In addition, coal mine gas volume and CH 4 With the increase of extraction time, there is also a gradual attenuation trend

On the other hand, there is a large amount of organic domestic waste and crop straw in coal mine life, which will cause serious environmental and safety hazards if discarded or open-air burning

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