In calcination processes, solid intermediates and products are regularly handled in the fine powder form (ex: kaolin or metakaulin). There is a need to separate these very fine powders from the exhaust streams of calciners, fluid bed dryers or incinerators, often at critical temperature conditions.
For PM emission control at very high temperature ( >600ºC), traditional bag filters following temperature exchangers or scrubbers are used as end stage dedusters.
For most arrangements, a primary high temperature separator, namely a cyclone, is important to reduce as much calcined dust as possible. A good efficiency is important to reduce concentration of solids to the final stage dedusting system, thereby minimizing product losses and emissions.
Most arrangements have considerable investment and operation costs. Traditional bag filters imply the frequent change of bags and a high investment in temperature exchangers. Scrubbers are alternative end stage dedusters, but at the cost of secondary wet pollution.
Client's needs include an efficient and robust cyclone pre-separator and a very high efficient final stage dedusting system, which can operate at high temperatures for many years with low maintenance/operating costs.