高温集塵用セラミックフィルタの集塵・再生特性

抄録

On the gas cleaning technology using ceramic filters at high temperatures, we are confronted to many difficulties such as cracking of filter, rapid increase in filter pressure drop and insufficient filter cleaning. Many researches have been conducted to find the optimum operating condition of filter at low pressure drop in order to prolong the filter life.
This paper reviews the experimental and numerical simulation works on the dust collection and the detachment process of dust layer on rigid ceramic filter surface. The dust layer formed on the ceramic filter has a dense structure in the initial stage of filtration being porous with a decrease in filtration velocity and an increase in temperature. The change in filter pressure drop during cleaning operation can be predicted by CFD. The cleaning efficiency increases with the porosity of dust layer and it is strongly influenced by the adhesive and cohesive forces of dusts at high temperatures. Therefore, the porosity of dust layer is a crucial factor in maintaining a high cleaning efficiency.
The main difficulty in conducting experimental works in this field arises from the difficulty in finding appropriate experimental conditions which sufficiently mimic the actual utility plant.