Experimental Research On Integrated Fine Dust Agglomerator

Industrial soot emissions is a main factor of atmospheric pollution.With the development of the society,our country constantly improve the requirements of dust emissions,many areas require that concentration of soot emissions is less than 30 mg/Nm3 even more today.For one point,electrostatic precipitators have advantages of high efficiency、low energy consumption and wide application,being widely used in the field of dust removal.But for another,due to the size of fine particles is so small that it’s difficult to be fully charged,the conventional electrostatic precipitators for its low efficiency eventually led to the flue gas discharging standard.Therefore,how to improve the capture efficiency of fine particulate matters has become a hot research topic in the field of electrostatic dust removal.Effect of charged agglomerating technology to controlling the release of the fine particles is remarkable,and with process simple and reliable,low operation cost,and small conditioned by site,has a broad application prospect.However,the charged areas and agglomerating areas of traditional charged agglomerator are separated so that performance and adaptability are limited.Based on the research of the dust charged and the condensing mechanism,the paper take charged coagulation and integration as the train of thought,carrying out the experiment of electrode matching,grounding pad,electrode configuration,power supply,air distribution of traditional charged agglomerators,and through the preliminary simulation tests,designing a integrated fine dust agglomerator.With hole opening rate of 34%of the pad as a ground pad,with the SG20 barbed wire as the positive and negative put wires,width of the cross channel being 360mm,Corona wire spacing being 100mm,with the high voltage as a power supply,with v-shaped guiding plate forming flowing charged,the integrated fine dust agglomerator further improve the effect of dust agglomerating.According to present situation and modification requirements of baosteel iron sintering machine collection system,groups joint the baosteel iron and the institute carried out the industrial tests on the integrated fine dust agglomerator in a baosteel iron sintering machine.the flow field and intensity of the integrated fine dust agglomerator are simulated firstly,results show that the flue gas in agglomerators flows uniformly,the resistance of integrated agglomerator is 177Pa,the maximum stress of agglomerator shell is 215MPa,the maximum deflection of the shell is 11mm,all complying with the scene requirements.The scheme of adding the integrated agglomerator to the level flue gas duct in front of the electrostatic precipitator is feasible.The project was completed in May 24,2014 and one-time put into operation successfully followed by.At last,groups have done industrial experiments of integrated fine dust agglomerator,systematically studying the working condition of flue gas,agglomerators’ resistance and leakage rate,agglomerating effect,implement efficiency to the electrostatic precipitator.Results show that the dust concentration of sintering flue gas ranges between in 600mg/m3～1000mg/m3 volatily;Resistance of the agglomerator is 190.5Pa,leakage rate is 0.33%,both lower than the design requirements,have no adverse impacts on the sintering production;when both positive and negative voltage of charged agglomerators are 50kV,the collection efficiency of electrostatic precipitators for PM 10 increases by 51.1%,the collection efficiency of electrostatic precipitators for PM2.5 increases by 48.1%,the collection efficiency of electrostatic precipitators for PM1 increases by 88.3%.The above shows that charged agglomerators can significantly improve the collection efficiency of electrostatic precipitators for fine particles.