Experiences gained from the sampling of chlorine aromatics in the raw gas of waste incineration plants - Conclusions with regard to dedusting technology

The findings obtained from sampling of chlorine aromatics by mechanical separation of the dust phase in the raw gas of waste incineration plants demonstrate that above about 200 degrees C, a formation preferentially of PCDD and chlorophenoles, and to a lesser extent of PCDF and chlorobenzenes takes place. Formation is mainly caused by the fine dust fraction. The carbon content in the fly ash plays a minor role. From the comparison of these findings with earlier balancing experiments at an ESP a comparable formation mechanism can be suggested. Up to now this mechanism is not well understood. A threshold temperature for all dedusting operations in the raw gas of municipal solid waste incineration plants of a maximum of 200 degrees C is recommended.