O-202 未利用材を用いた発電およびコジェネレーションのGHG排出量(システム,Oral Session2)

概要

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We estimated greenhouse gas (GHG) emissions based on life cycle assessment of electric generation and cogeneration by forest residues in order to analyze quantitatively the environmental superiority. The following 2 scenarios were schemed. Scenario 1: Electricity is generated with 100,000 m^3 of forest residues. Scenario 2: Electricity and heat were cogenerated with 50,000 m^3 of forest residues. The heat was derived from extraction turbine under the condition of 0.5 MPa steam pressure and 7 t/h steam flow. When the generator outputs in the scenario 1 and 2 were respectively 5,760 and 1,400 kW, electrical and overall efficiency were estimated at 19.3% and 47.4%. The GHG emissions reduction ratio per functional unit in the scenario 1 and 2 were respectively 75% and 91% compared with the energy system depending on fossil fuel. It was shown that the utilization of waste heat derived from the electric generation was more effective way to reduce GHG emissions.
一般社団法人日本エネルギー学会の論文
2014-01-08