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http://dx.doi.org/10.14478/ace.2019.1083

Effect of Coagulants on the Behavior of Ultra Fine Dust in a Coal Firing Boiler  

Ryu, Hwanwoo (Department of Chemical Engineering, Kunsan National University)
Song, Byungho (Department of Chemical Engineering, Kunsan National University)
Publication Information
Applied Chemistry for Engineering / v.31, no.1, 2020 , pp. 84-89 More about this Journal
Abstract
Particulate matters of PM2.5, particularly focusing on 0.1~1 ㎛ decrease the efficiency of dust-collector due to the brownian-motion. This study is to verify the effect of coagulant on the particle size distributions of potassium and PM2.5. The activated coagulant was spayed to the coal fired fluidized bed combustion boiler by the weight ratio of 1,200 : 1 = coal : coagulant, and the size distributions of captured particles at both the cyclone (FP) and electrostatic precipitator (EP) were measured. As the result of XRP analysis, the potassium content of FP increased to 13.33% (averagely from 1.65% to 1.87%) and, in EP at 17.68% (averagely from 1.65% to 2.03%). And it was confirmed by the particle size distribution analyzer and SEM image analysis that the distribution rates of PM2.5 decreased at 89.53% on average in FP, and at 88.57% in EP. The total dust concentration (mg/㎥) confirmed by tele-monitering system (TMS) decreased during the primary test from 2.6 to 1.7~1.9 and also the secondary test from 2.9 to 1.7~1.9.
Keywords
$PM_{2.5}$; Ultra fine dust; Coagulant; Dust collector; Activated sodium aluminate;
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