Synergistic Emission Reduction of Particulate Pollutants in Coal-fired Power Plants Using Ultra-low Emission Technology

Leixing Tao ； Yanyan Wang ； Chunmei Yue ； Zhigang Shen ； Zhichao Liu ； Qizhen Liu ； Junchao Lu ； Jian Wang ； Honglei Ding ； Weiguo Pan

《Aerosol and Air Quality Research》 20卷11期 (2020/11) Pp. 2529-2535

https://doi.org/10.4209/aaqr.2020.01.0004

摘要

The total particulate matter (TPM) is a crucial indicator when evaluating flue gas emissions from coal-fired units. TPM contains solid and liquid contaminants and condensable particulate matter (CPM), which is mainly composed of sulfate and various anions, cations, and metal ions. This study selected three typical large-capacity coal-fired power plants in Shanghai retrofitted with ultra-low emission technology and monitored their emissions of PM_(2.5), SO_3, and CPM during power generation. The results showed that the plants achieved comprehensive removal rates of 99.689-99.878% and 86.99-92.92% for PM_(2.5) and SO_3, resulting in emitted concentrations of approximately 0.99-1.79 and 1.91-2.50 mg m^(-3), respectively, which are considerably lower than those associated with the traditional flue gas process. Additionally, a significant decrease in the emitted filterable particulate matter (FPM) caused a simultaneous decrease in CPM. After being equipped with the ultra-low emission technology, the units displayed a 76% reduction in the emitted FPM concentration and a smaller FPM/CPM ratio (1:2 vs. 1:1). The emitted TPM (the sum of CPM and FPM) was reduced by 82%, with an average measured concentration of 7.36 ± 3.56 mg m^(-3). The values we obtained are representative and provide basic data for environmental assessment and local environmental policy formulation.

關鍵字

Ultra-low emission ； Total particulate matter ； Condensable particulate matter ； PM_(2.5) ； SO_3