[Influence of dust catchers on PM10 emission characteristics of power plants].
[Influence of dust catchers on PM10 emission characteristics of power plants].
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发表时间：
2006-10
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通讯作者：
Honghong Yi;J. Hao;L. Duan;Xinghua Li;Xing-ming Guo
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作者：
Honghong Yi;J. Hao;L. Duan;Xinghua Li;Xing-ming Guo
在5个不同电厂的除尘器入口和出口进行了试验，测定了除尘器对PM10排放特性的影响。采用电动低压冲击采样器（ELPI）进行现场测量，该采样系统由等速采样探头、预切割旋流器、两级稀释系统和仪器采样线组成。在空气动力学直径为0.03微米至10微米的范围内测量粒度分布。结果表明，该测试系统可广泛应用于固定源颗粒物的采样。除尘器前后的颗粒物粒径分布均为双峰分布，包括亚微米级和粗粒级，峰值分别在0.07-0.12 μ m和0.76-1.23 μ m。电除尘器和袋式除尘器的最小除尘效率都出现在0.1-1微米的粒径范围内。在此粒径范围内，袋式除尘器的除尘效率高于电除尘器，电除尘器对PM 1和PM2.5的除尘效率也低于PM10。PM10的质量浓度主要由大于1 μ m的颗粒物占主导地位，而数浓度主要由小于0.1 μ m的颗粒物占主导地位。静电除尘器除尘后的质量和数粒粒径分布测试结果表明，静电除尘器末级电场振打后，颗粒物的质量和数粒浓度明显增加。振打均不同程度地降低了静电除尘器对颗粒物的数浓度和质量浓度的收集效率，且最大降幅出现在PM 1.
Influence of dust catchers on PM10 emission characteristics was determined experimentally at the inlet and outlet of dust catchers at five different power plants. Electrical low pressure impactor (ELPI) with a sampling system, which consisted of an isokinetic sampler probe, pre-cut cyclone, two-stage dilution system and sample line to the instruments, were used to measure in situ. Size distribution is measured on the range from 0.03 microm to 10 microm in aerodynamic diameter. The results show that the testing system can be used widely for sampling of particulate matters from stationary sources. Before and after all the dust catchers, the particle number size distributions display the bimodal distribution which contained the submicron mode and the coarse mode with a peak around 0.07-0.12 microm and 0.76-1.23 microm, respectively. The minimum collection efficiency of the ESP and the bag-house both appear in the particle size range of 0.1-1 microm. In this size range, bag-house collection efficiency is higher than that of ESP. The ESP collection efficiencies of PM1 and PM2.5 based on the number concentration are also lower than that of PM10. The mass concentration of PM10 is mainly dominated by the particles which are larger than 1 microm, while the number concentration is dominated by the particles which are smaller than 0.1 microm. Mass and number size distributions measured after ESP can be seen that mass and number concentration of PM10 will increase obviously by rapping the last electric field. Furthermore, the ESP collection efficiencies based on the number concentration and mass concentration were both decreased by ESP rapping with different degree; and the maximum drop degree was appeared in PM1.