电极配置及参数对多孔电极电除尘器电场与除尘性能影响研究

INFLUENCE OF ELECTRODE CONFIGURATION AND PARAMETERS ON ELECTRIC FIELD AND DUST REMOVAL PERFORMANCE OF POROUS ELECTRODE ESP

工业电除尘器受反电晕、微细颗粒捕集效率低等因素影响使超低排放运行过程不稳定,故采用开孔式收尘极板并优化极配形式与参数以减缓上述问题发生,并保证电除尘器高效稳定运行。通过COMSOL Multiphysics模拟试验研究了不同同极间距、线距、板形、线形对电场与除尘性能的影响。结果表明:500 mm同极间距利于高比电阻粉尘捕集。最佳线距处于同极间距的0.5~1倍范围内,此时板表面平均电流密度最大。4种多孔板结构对反电晕现象均有一定的减缓作用,错孔板结构收尘场强最大,除尘性能最优;空腔内增加极板对0.01~0.1μm微细颗粒物捕集效率提升16%。4种线形中,新型鱼骨线除尘性能优于其他线形,采用错孔式收尘极板与新型鱼骨线相配时,除尘区域内收尘场强最佳,颗粒物理论有效驱进速度较其他极配形式提升47%,减少了电除尘器的投资成本和运行费用。该研究结果可为多孔电极电除尘器在超低排放设计应用中提供参考。

The industrial ESP is affected by the problems of anti-corona and low collection efficiency on ultrafine particles,resulting in its unstable operation performance for ultra-low emission.Adopting the porous dust collecting plate and optimizing the electrode configurations and parameters can all alleviate the above problems to ensure the efficient and stable operation of ESP.Through the COMSOL Multiphysics simulation test,the effects of different plate-plate distance,wire-wire distance,plate shape,and line shape on electric field and dust removal performance were studied.The results showed that 500 mm plate-plate distance was conducive for high specific resistance collection.When the optimum line spacing was 0.5 to 1 times of the plate-plate spacing,the average current density on the surface of the plate was the highest.The four kinds of porous plates all had a slowing effect on the anti-corona phenomenon,and the cross-porous plate had the largest dust field strength and the best dust removal performance.Adding a plate in the cavity increased the collection efficiency of fine particles(0.01μm to 0.1μm)by 16%.The dust removal performance of the new fishbone line was better than other lines.When the cross-hole dust collecting plate was matched with the new fishbone line,the dust field strength in the dust collecting area was the highest,and its theoretical effective driving speed of particulate matter was 47%higher than other electrode configuration,which reduced investment and running cost of the ESP.The research results can provide a reference for the design and application of PDCE-ESP for ultra-low emission.