PURE VEGETABLE OIL FUELS FOR CHP: TECHNICAL, ECONOMICAL AND SUSTAINABILITY ASPECTS UNDER GERMAN CONDITIONS

摘要

Vegetable oil fuelled CHP units save fossil energy sources and greenhouse gas emissions effectively.Today more than 30 enterprises provide vegetable oil compatible CHP units in Germany. The number of plants andthe installed electrical power decreased dramatically within the last two years. Reasons therefore are high prices forvegetable oil fuels in the year 2008, accompanied with inadequately performed heat use concepts. Besides that, theamendment of the Renewable Energy Sources Act led to a lack of planning reliability, regarding power feed-incompensation as well as certification issues of sustainable vegetable oil fuels. Small-scale vegetable oil compatibleCHP units are predominantly fuelled with rapeseed oil, in plants of higher power ranges palm oil is mainly used.Quality demands for rapeseed oil fuel are defined in the standard DIN V 51605, simultaneously the standardisation ofother vegetable oil fuels is in progress. Under German conditions with power feed-in compensation, heat generationcosts vary between 0,09 and 0,14 Cent/kWh, depending on the plant size. However a sophisticated heat concept isessential. For higher market relevance of small-scale vegetable oil compatible CHP plants, the administrative expensehas to be reduced and reliable framework conditions have to be secured.