Ceramic Honeycomb Filter for Hot Gas Cleaning

Abstract

A new ceramic honeycomb filter is currently under development. This filter is applicable to hot gas cleaning and dust collection, and possesses a high filtering area per volume. The filter is made of mullite or cordierite and employs a honeycomb structure. It has external dimensions of 150 mm square × 500 mm in length, a 9.9 mm square cell, porous cell wall thickness of 1 mm, mean pore diameter of 15 μm, and filtering area density of 145 m²/m³.

The cleaning apparatus is composed of packs that contain the filters, a pulse dedusting device and a housing. The apparatuses have been successfully used for stationary diesel engines, waste incinerators and chemical process powder collection. In a diesel engine exhaust application, the collection efficiency exceeded 99% under conditions of an unburned carbon soot load of 0.5 g/Nm³, filtering velocity of 1.0 m/min and maximum gas temperature of 400 °C. Under these conditions, a stable pressure drop was maintained at 4 kPa after 5000 hours of operation.