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水泥厂立窑烟气适宜除尘方法研究

郑寿贵　刘江　胡国华　蔡祖华　吴因南　陈姿娟　刘光铨

　　摘要　目的　提出小水泥厂立窑烟气应选用的适宜除尘方法。方法　根据GB/T16157-1996固定污染源排气中颗粒物的测定和气态污染物的采样方法，并使用WY-1型烟道用7级冲击式尘粒分级仪等测定了立窑烟气的温度、露点温度、粉尘浓度、粉尘粒径分级组成等特性；测定了沉降室、旋风、冲击水浴、冲击-喷雾除尘器的粒径分级除尘效率等特性。结果　在上述基础上，将除尘器与尘源进行合理匹配，提出了排放达标的几种除尘器选型组合：①沉降室加静电除尘器；②沉降室加冲击喷雾除尘器；③沉降室加冲击水浴除尘器等。结论　采用适宜的除尘方法及对除尘器进行科学的选型，避免了以往经验选型的失误。
　　关键词　烟　粉尘

Studies on Appropriate Methods for Dust Scrubbing from Dust-laden Gas in Shaft Kilns of Small-sized Cement Plants

ZHENG Shougui*, LIU Jiang, HU Guohua, et al.
*Health and Anti-epidemic Station of Jinhua County, Jinhua, Zhejiang 321000

　　Abstract　Objective　To study an appropriate method for dust scrubbing from dust-laden gas in the shaft kilns of small-sized cement plants. Methods　Characteristics of dust-laden gas, including its temperature, dew point, dust concentration, diameters of dust particles and their distribution, as well as fractional dust collection efficiencies of the dust precipitator settling chamber, cyclone, impinging scrubber, impinging-spray scrubber, were measured according to the National Standards for Measurement of Particulate in Exhaust Gas Emitted from the Stationary Pollution Sources and Sampling Methods of Gaseous Pollutants（GB/T16157-1996）, with a WY-1 In-stack 7-Stage Cascade Impactor for fractional dust collection. Results　The fractional dust collection efficiency of the settling chamber for the particles greater than 12 μm was 72%, while that of the cyclone for the particles of 2 μm, 5 μm and 10 μm were 40.0%, 72.5% and 88.9%, respectively, and that of impinging scrubber was 55.0%, 91.0% and 98.9%, respectively; and that of impinging-spray scrubber were 96.0%, 99.2% and 99.6%, respectively. Results showed that 81% of the dust (by weight) from the shaft kilns were greater than 10 μm, so the settling chamber was effective for the removal of this fraction of dust. But dust particles behind the settling chamber were finer, and about 5

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