Technological method for producing biogas by utilization of organic matter

Abstract

The invention discloses a technology for producing biogas by the utilization of an organic matter. The pretreated organic matter undergoes biodegradation by the adoption of an anaerobic dry fermentation technology. During the process, a liquid spray device which is arranged on the upper portion of a dry fermentation device is turned on. According to the mass transfer need of dry fermentation and the need of liquid on the absorption of CO2, the distribution of a spray liquid between the upper gas space and a lower fermentation heap is controlled to guarantee stable operation of dry fermentation and continuous dissolution of CO2 by the spray liquid. The liquid for the dissolution of CO2 is pumped into a decarburizing unit to remove CO2 and then returns into the dry fermentation device to continuously absorb CO2. Methane enriched biogas with the content of CH4 being greater than 85% is produced by this means and then undergoes depth purification to obtain high-purity biogas with the content of CH4 being greater than 95%. The combination of dry fermentation and methane in situ concentration has created conditions for reducing the production cost of biogas. Therefore, the technological method provided by the invention has multiple functions of environmental protection, comprehensive utilization of resources and clean fuel gas output.

Description

technical field [0001] The invention belongs to the technical field of bio-energy development and environmental protection, and in particular relates to a process for preparing bio-natural gas by using organic matter. Background technique [0002] Driven by energy conservation and emission reduction policies and economic development needs, my country's natural gas consumption is growing at an annual rate of 16%. It is estimated that by 2020, natural gas consumption will be close to 300 billion m 3 , then natural gas consumption will account for 8% to 10% of the total primary energy consumption. In order to meet the demand for clean energy in social and economic development, the development of bio-natural gas as an alternative fuel to natural gas has become an important development trend. The use of organic waste such as straw, urban organic waste, and farm manure to produce biogas, and then further purification to produce biogas to replace conventional natural gas is attrac...

AI Technical Summary

Problems solved by technology

CH in biogas 4 The content is usually 45-60%, while CH in biogas 4 The content requirement reaches more than 95%, which makes the downstream purification link bear a high purification load, which is the fundamental reason for the high production cost of bio-natural gas

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