Characterization of sintering dust collected in the various fields of the electrostatic precipitator

被引:24
|
作者
Lanzerstorfer, Christof [1 ]
Steiner, Dominik [2 ]
机构
[1] Univ Appl Sci Upper Austria, Sch Engn Environm Sci, Wels, Austria
[2] Scheuch GmbH, Aurolzmunster, Austria
关键词
Sinter plant; electrostatic precipitator; dust properties; de-dusting; FLY ASHES; FILTER;
D O I
10.1080/09593330.2015.1120787
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Sinter plant off-gas is usually de-dusted by electrostatic precipitators. Compliance with the dust emission limits is often difficult because of the high specific resistivity of the emitted dust. Mechanical properties of the dust are also relevant for the electrostatic precipitator design. Dust samples from the four consecutive electrostatic precipitator fields were characterized in this study. Most measured parameters showed a considerable variation in the various dust samples. The particle size of the dust as well as its bulk density continuously decreased from the first field to the fourth field. The flowability of the dusts was generally bad and decreased from the first to the last field. In contrast, the wall friction angles with structural steel were quite constant at approximately 30 degrees. The Fe content was lower in the dust from the last two fields while the concentration of K, Na, Cl- and [GRAPHICS] was significantly higher. At the same time the particle density was lower. The maximum specific dust resistivity for the first field and second field dust was approximately 3 x 10(11) omega cm and no signs for the occurrence of back corona were detected. For the dusts from the last two fields the maximum value was approximately 2 x 10(12) omega cm. Back corona was observed in the temperature range from 120 degrees C to 210 degrees C. In this area the dust resistivity values were higher than 4 x 10(11) omega cm.
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页码:1559 / 1567
页数:9
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