Abstract
Although porous ceramic filters are promising device for coal gas cleaning, it is necessary to maintain stable base line pressure loss, which is the pressure drop of the filter just after reverse cleaning. As penetration and covering of the filter pores by coal char increase the pressure loss, a method to recover the permeability by removing the particles was investigated.
The ignition temperatures of some coal chars were lower than 773 K. A regeneration test of a used filter showed that the filter temperature could also be kept at lower than 773 K during 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 protect the filter surface from dust particles. Therefore, this regeneration method may improve the filter durability effectively.
