电除尘器对烧结灰除尘性能影响的试验研究

在电场断面面积为0.3 m 2(600m× 500 m)的电除尘器(ESP)实验系统上,采用正交试验法,确定电晕线型式、含尘浓度、电压值和风量(电场风速)4个试验因子,总除尘效率为指标值,进行电除尘器对烧结灰除尘性能的试验研究.研究结果表明,当气流含尘浓度从15g/m3提高到25g/m3时,ESP的总除尘效率η从96.87%降至87.55%;当电源电压值由85 kV增至96 kV后,ESP的总除尘效率从98.16%降至87.55%;当ESP的电场风速由0.62 m/s增至0.79 m/s,总除尘效率由96.87%降至92.46%;星型线ESP的除尘效率相对较低;尖端放电可改善ESP用于高比电阻粉尘时的操作性能,芒刺线、锯齿线ESP的除尘效率分别高达99.46%和99.55%.

A RESEARCH ON COLLECTION EFFICIENCY OF ESP FOR SINTERING DUST

The paper aims to improve the collection efficiency of Electrostatic Precipitators (ESP) with 0.3 m~2 electrical field area for sintering dust. The author has adopted a method of vertical test in determining the data concerned, such as the type of electrode, the dust concentration, power source voltage as well as the gas velocity for his experimental factors as the index values. The test results indicate that high dust concentration may lead to corona discharge block. And, as a result, the ESP collection efficiency may decrease from 96.87% to 87.55% on the condition that the dust concentration rises from 15 g/m~3 to 25 g/m~3. However, when the power source voltage increases from 85 kV to 96 kV,the ESP collection efficiency will decrease from 98.16% to 87.55%. But, if dust resistivity increases, the spiked emitter type electrodes may improve the ESP operation.