Emission Characteristics Of Particulate Matter Of Steel Plants

In recent years,serious haze weather happen continually in many areas of our country.Studies have shown that PM2.5 is the main reason of the haze weather,which represents higher requirements about the control of particulate matter(PIM)emission.Steel plants are mainly responsible for PM emission,but the present studies are focus on the reduction of the total suspended PM.And there are less researches on those that include particle size distribution,PMio and PM2.5 emission status and grading dust removal efficiency of dust-removing equipment.According to the above problem,there are three research aspects in this paper:(1)Through data collection and field investigation,the testing program about 12 stationary sources PM of four processes including sintering,coking,puddling and steel-making has been established.Besides other parameters are tested,which include exhaust gas basic parameters of each pollution source,particles size distribution of dust removal equipment and mass flow rate and particle size distribution of dust removal equipment exit.(2)Characteristics of the PM10 particle size distribution are studied.PM10 quality percentages of sintering machine heads,blast furnace trapping fields,pour cans,preprocessing,converter secondary fume and refining dust catchers are higher,and they are 58.86%,58.37%,84.79%,82.42%and 85.42%respectively.And PM2.5 quality percentages in PM10 are higher,including sintering machine heads,blast furnace trapping fields,pour cans,preprocessing,converter secondary fume,and they are 44.68%,52.90%,40.79%and 52.90%respectively.PM10 and PM2.5 quality percentages of all pollution sources increase after through dust collectors.(3)PM emission condition is analyzed.PM10 and PM2.5 emission load per unit product are higher,including sintering machine heads,sintering machine tails,blast furnace trapping fields and converter secondary fume.PM10 emission load include 0.032 kg/t-sinter,0.021 kg/t-sinter,0.037 kg/t-iron and 0.037 kg/t-steel.And PM2.5 emission load include 0.018 kg/t-sinter,0.011 kg/t-sinter,0.024 kg/t-iron and 0.021 kg/t-steel.The concentration of PM10 and PM2.5 are higher,which include sintering machine heads,sintering machine tails,coal charging and coke pushing,blast furnace trapping fields,pour cans and preprocessing,converter secondary fume and refining dust collectors.What's more,the concentration of PM10 is higher than 10 mg/m3,and that of PM2.5 is higher than 5 mg/m3.(4)Grading dust removal efficiency is analyzed,and they all accord this condition:?PM2.5<?PM10<?TSP.Therefore,it is necessary to concern dust removal effect of fine particle of sintering machine heads,blast furnace trapping fields,pour cans,preprocessing,converter secondary fume and refining dust catchers.