공주 축산폐수공공처리장 바이오가스-마이크로터빈 분산발전시스템 경제성 향상에 관한 연구

Korea Electric Power Corporation (KEPCO) has started the nation's first biogas-microturbine project in the city of Gongju as an effort to encourage the utilization of wasted biogas containing useful energy source in the form of CH₄. The goal of the project is to set up the biogas microturbine co-generation system for utilizing biogas as an energy source and improving the economics of the wastewater treatment plant. Biogas pre-treatment system satisfies Capstone's fuel condition requirement with the test result of 99.9% and 90.2% of hydrogen sulphide and ammonia is removal performance. installation of microturbine and manufacture of heat exchanger to warm anaerobic digester has been done successfully. Expected economic profit produced by the system is coming from energy saving including electricity 115,871㎾h/year and heat contained in exhaust gas 579GJ/year. However, the system is needed to upgrade its economics by increasing biogas production and optimizing opereation mode in the future and the feasibility is discussed. Changes in internal recirculation ratio and pre-treatment degree are needed to optimize plant operation and biogas production. For the operation mode, rather than continuous full day operation with the partial load, intense operation during peak demand hours with full load will be needed to increase the efficiency of the system.