Dust-Removal Technique Combined with Dust Pre-Charge and Electric Ceramic Tubes Loaded with High Voltage

Abstract：A new dust elimination technique combined with dust pre-charge and electric ceramic tubes loaded with high voltage was investigated. During the operation of this technique, the dust was firstly pre-charged by pre-charge appliance with DC negative corona (-20 kV), and then the gas containing dust was forced to penetrated the wall of porous electric ceramic tubes loaded with negative high voltage (-5000 V) to undergo dust elimination. It was revealed by the results that, this new technique obviously decreased the pressure drop of the ceramic tubes during the de-dust process. With the new technique, the increasing speed of the pressure drop was only 0.18 times to that with normal technique in same conditions during the same operation time. The increasing speed of the pressure drop under the new technique was only 0.29 times to that with normal technique in same conditions under the same dust layer mass. The results were high possibly caused by the fact that the electrostatic repulsion force between the dust particles gives rise to loosely compacted dust layer, furthermore, the electrostatic repulsion between the electric porous ceramic tubes and the pre-charged dust particles bring about very loose attachment between the dust layer and tube surface, as a result, the dust layer was easy to remove and its pressure drop was greatly decreased. This new technique was expected to obviously reduce the pressure drop of ceramic tube in industrial de-dust operation, and prolong its regeneration period.