Study On Sintering Dust Characteristics And Discharge And Subsequent Development Of Electrostatic Precipitator Platform

In order to find out key factors that improve electrostatic precipitator（ESP）collection efficiency of the sintering plant, this paper studies sintering dust characteristics,needle-plate corona discharge, airflow distribution in ESP, and involving the four majorproblems in the use of the ESP: dust characteristics, rapping cleaning, power supply andairflow distribution. Designed on the basis of these studies, the ESP is used as theexperimental platform of follow-up experiments.In terms of dust characteristics, the studies include particle size, phase, XRF,chemical composition and density of the dust in sintering nose and tail. Through researchwe can conclude that particle size and content of Fe, K are root causes that lead to thedifferences of dust removal efficiency.In terms of rapping cleaning, the study about the influence of dust thickness oncorona discharge shows that the corona current of sintering nose dust isparticularlysensitive todustdeposition in needle-plate corona discharge device and the inflection pointof corona current appears in thinner section of dust thickness, so the rapping cycle shouldbe shortened in the use of the ESP, whereas the rapping cycle can be properly lengthenedfor sintering tail dust.In terms of power supply, the study about the influence of ripple coefficient oncorona discharge shows that a decrease in ripple coefficient can significantly improvecorona current, in addition that ripple coefficient is only related with power supply. Highfrequency power supply can provide direct-current with ripple coefficient below5%, soit was applied to the experimental platform and compared with industrial frequencypower.In terms of airflow distribution, the study based on CFD numerical simulation in ESPshows that porous plates play a largerolein uniformdistribution of airflow. Moreover, inthe case that the porous plate with smaller central holes, and larger peripheral hole, theuniform distribution of airflow is the best.Based on the fundamental research above, the preliminary design and lectotype ofESP main structure, discharge electrode system, dust-collection electrode system, inlet and outlet gas box, airflow uniform system, the dust storing system and high voltage powersupply were performed.