For PM emission control in very high temperature industrial exhaust streams (more than 400 ºC), such as pyrolysis and incineration furnaces, either traditional bag filters following temperature exchangers, or ceramic filters are used. Both arrangements have high investment and operation costs. On the one hand, traditional bag filters imply the frequent change of bags and a high investment in the temperature exchanger. On the other hand, ceramic filters can withstand high temperatures but have a high pressure drop, typically up to 3 kPa, gradually increasing due to clogging of the pores, fracturing and difficulties in removing the filter cake off the surface. The long-term durability and cracking risk (mainly during cleaning) of the elements are critical.
Gasification processes are also associated with high temperature separation to avoid the condensation of tar.
Client's needs include a very high efficient dedusting system that is robust enough to operate at high temperatures for many years with low maintenance/operating costs and achievable for a reasonable price.