Experimental And Theoretical Study On Dual - Zone Tubular Thermo - Ejection High Temperature Electrostatic Precipitator

High temperature dust collection is the key to develop the advanced coal-fired combined power cycles like IGCC and PFBC into practical use. However, there is some limit in every present technology.The non-corona thermal emission style electrostatic precipitation is an innovative technique for cleaning up hot flue gases. It utilizes the negative electrode made of some particular material based on tungsten and added with rare-earth oxides, which emits a large number of electrons when heated, instead of the corona discharge in traditional ESP, to charge dust particles. The charged particulate is collected by grounded plates under the action of the electric field.The precipitation tests were carried out on the self-designed facility. The separation efficiency and the factors influencing it like temperature, charging voltage, collecting voltage, dust concentration and gas flow rate, were investigated. The dust-removing properties and availability of this device was discussed.Based on the experimental results, the theoretical calculations were completed. The influence of variables including temperature, voltage, flow velocity, dust diameter on ash collection effect was theoretically analyzed. Both the theoretical and experimental results indicate that the thermal emission style electrostatic precipitation achieves high dust-removing properties at high temperature or low voltage, with good application prospects.