| 论文简介 |
The air pollution control devices (APCDs) of industrial boilers in China are backward compared to coal-fired
power plants, enhancing serious particulate matter (PM) pollution. The PM removal characteristics of APCDs from two
industrial boilers [a circulating fluidized bed (CFB) boiler and a chain-grate boiler (CGB)] with ultralow emission were studied
in this research. PM was sampled at the inlet/outlet of the fabric filter (FF), wet flue gas desulfurization (WFGD), and wet
electrostatic precipitator (WESP) through the cyclone-filter sampling system. The morphology and water-soluble ions of PM
were analyzed by scanning electron microscopy (SEM) and ion chromatography (IC). The results show that the concentrations
of PM with aerodynamic diameters of ≤1, 2.5, and 10 μm (PM1, PM2.5, and PM10, respectively) at the precipitator inlet of CFB
are much higher than those of CGB. The PM removal efficiency of FF in the CFB boiler is 98.12−99.56%, while that of CGB is
only 90.0−93.6%. WFGD can increase the alkalinity of PM, and the combined PM removal efficiency of WFGD coupled with
WESP is 46.75−62.77%. SO42− is the most abundant water-soluble anion in PM, while the water-soluble cations are richest in
Ca2+ and Na+. After ultralow-emission retrofit, the emission factors (EFs) of PM10, PM2.5, and PM1 are 0.028−0.033, 0.025−
0.028, and 0.014−0.017 kg/tonne, respectively. The percentage of PM2.5 in PM10 is 85.2−88.6% at the WESP outlet. These
results are significant to the understanding of emission characteristics for atmospheric fine particles from industrial boilers with
ultralow emission in China. |
(创新港)
