Yi Honghong, Hao Jiming, Duan Lei, Li Xinghua, Guo Xingming
Department of Environment Science and Engineering, Tsinghua University, Beijing, People's Republic of China.
J Air Waste Manag Assoc. 2006 Sep;56(9):1243-51. doi: 10.1080/10473289.2006.10464590.
In this investigation, the collection efficiency of particulate emission control devices (PECDs), particulate matter (PM) emissions, and PM size distribution were determined experimentally at the inlet and outlet of PECDs at five coal-fired power plants. Different boilers, coals, and PECDs are used in these power plants. Measurement in situ was performed by an electrical low-pressure impactor with a sampling system, which consisted of an isokinetic sampler probe, precut cyclone, and two-stage dilution system with a sample line to the instruments. The size distribution was measured over a range from 0.03 to 10 microm. Before and after all of the PECDs, the particle number size distributions display a bimodal distribution. The PM2.5 fraction emitted to atmosphere includes a significant amount of the mass from the coarse particle mode. The controlled and uncontrolled emission factors of total PM, inhalable PM (PM10), and fine PM P(M2.5) were obtained. Electrostatic precipitator (ESP) and baghouse total collection efficiencies are 96.38-99.89% and 99.94%, respectively. The minimum collection efficiency of the ESP and the baghouse both appear in the particle size range of 0.1-1 microm. In this size range, ESP and baghouse collection efficiencies are 85.79-98.6% and 99.54%. Real-time measurement shows that the mass and number concentration of PM10 will be greatly affected by the operating conditions of the PECDs. The number of emitted particles increases with increasing boiler load level because of higher combustion temperature. During test run periods, the data reproducibility is satisfactory.
在本研究中，在五家燃煤电厂的颗粒物排放控制装置（PECD）的入口和出口，通过实验测定了颗粒物排放控制装置的收集效率、颗粒物（PM）排放以及PM粒径分布。这些电厂使用了不同的锅炉、煤炭和PECD。现场测量由带有采样系统的低压冲击器进行，该采样系统由等速采样探头、预切割旋风分离器以及带有通往仪器的采样管线的两级稀释系统组成。粒径分布在0.03至10微米范围内进行测量。在所有PECD前后，颗粒数粒径分布呈现双峰分布。排放到大气中的PM2.5部分包含大量来自粗颗粒模式的质量。获得了总PM、可吸入颗粒物（PM10）和细颗粒物P（M2.5）的受控和不受控排放因子。静电除尘器（ESP）和布袋除尘器的总收集效率分别为96.38 - 99.89%和99.94%。ESP和布袋除尘器的最低收集效率均出现在0.1 - 1微米的粒径范围内。在此粒径范围内，ESP和布袋除尘器的收集效率分别为85.79 - 98.6%和99.54%。实时测量表明，PM10的质量和数量浓度将受到PECD运行条件的极大影响。由于燃烧温度较高，排放颗粒的数量随着锅炉负荷水平的增加而增加。在测试运行期间，数据重现性令人满意。
