Synthetic waste may be used as biomass fuel in a coal-fired power plant (CFPP) or as part of a coal mixture via co-firing. Differences in characteristics can cause problems during combustion, especially in plastic waste containing high alkali and chlorine content. The purpose of this research is to analyze the features of coal combustion with biomass and synthetic waste mixture to assess the effects of combustion. Combustion is conducted in a drop tube furnace (DTF) by analyzing the possibility of slagging, fouling and corrosion of the ash produced from each fuel. From the results of burning coal, no ashes stuck, only a trace of dust, in contrast to the results of burning coal with a mixture of 25% biomass and synthetic waste which produces a dark colour and has a tendency to stick to the probe. The change in the texture of the probe surface indicates that burning coal with a 25% mixture of biomass and synthetic waste is an unsafe composition for slagging, fouling, and corrosion.

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