The heat co-generation power arrangements in which SI reciprocating engines are fed with biogas can pose a real alternative of waste energy utilization in the cleaning processes of municipal sewage. The emission of exhaust gases in sewage plant vicinity is an unavoidable characteristic of this design, which raises the issue of appraising the harmful components of the gases. The study shows the results of experimental investigations conducted on three generator sets with modern SI reciprocating Deutz engines, TBG620V12K type. The results of complete norm tests were applied in parametric calculation of final exhaust gas emission coefficients. Due to transitory lack of national legislation on exhaust gas emission in such applications, limit values of emission were adopted from TA-Luft (Germany).
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