REGENERATION OF CERAMIC FILTER APPLIED TO COAL CHAR SEPARATION

Although porous ceramic filters are promising device for coal gas clea ning, it is necessary to maintain stable base line pressure loss, whic h is the pressure drop of the filter just after reverse cleaning. As p enetration and covering of the filter pores by coal char increase the pressure loss, a method to recover the permeability by removing the pa rticles was investigated. The ignition temperatures of some coal chars were lower than 773 K. A regeneration test of a used filter showed th at the filter temperature could also be kept at lower than 773 K durin g char combustion because the residual amount of char was small. In a filter recycle test, the base line pressure loss recovered after every regeneration cycle and the residual ash on the filter seemed to prote ct the filter surface from dust particles. Therefore, this regeneratio n method may improve the filter durability effectively.