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以镧钨和硝酸镧为原料,制备镧钨发射材料,研究其发射特性,并分析了镧钨阴极高温静电除尘器的除尘特性。研究表明,镧钨材料由La2WO6和W组成,逸出功2.88 eV。该材料的发射电流密度随温度和电压的升高而增大,温度对其影响显著。镧钨阴极热电子发射式高温静电除尘器荷电区离子密度可达1015～1016个/m3以上,比传统电晕式静电除尘器(ESP)的离子密度要高两个数量级以上。研究了烟气流速、荷电区电压以及粉尘粒径对除尘效率的影响。当粒径小于10μm时,除尘效率随着粉尘粒径的增大而提高很快。荷电区电压的增大提高了荷电区的离子密度,使得粉尘荷电量增加,从而提高了除尘效率。当流速超过1.2 m/s时,随着流速的增大,除尘效率迅速降低。
Lanthanum tungsten and lanthanum nitrate were used as raw materials to prepare lanthanum tungsten emissive materials and their emission characteristics were studied. The dust removal characteristics of the lanthanum tungsten cathode high temperature electrostatic precipitator were analyzed. Studies have shown that lanthanum tungsten materials from La2WO6 and W composition, work 2.88 eV work. The emission current density of the material increases with the increase of temperature and voltage, the temperature has a significant impact on it. Lanthanum tungsten cathode hot electron emission type high temperature electrostatic precipitator ion density in the charging area up to 1015 ~ 1016 / m3 above ion density than the traditional corona electrostatic precipitator (ESP) more than two orders of magnitude higher. The influence of flue gas flow rate, charging zone voltage and dust particle size on the dust removal efficiency was studied. When the particle size is less than 10μm, the dust removal efficiency increases rapidly with the increase of dust particle size. The increase of the voltage in the charging area increases the ion density in the charging area, which increases the charging amount of the dust, thereby improving the dust removal efficiency. When the flow rate exceeds 1.2 m / s, as the flow rate increases, the dust removal efficiency decreases rapidly.