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Published on: May 19, 2019
[Separation of PM2.5 from coal combustion with phase change]
Jin-pei Yan1, Lin-jun Yang, Xia Zhang
1School of Energy and Environment, Southeast University, Nanjing 210096, China. rocleaf@163.com
Huan Jing Ke Xue= Huanjing Kexue
|March 5, 2009
Summary
Steam addition significantly enhances PM2.5 removal from coal combustion by enlarging particles, improving collection efficiency by up to 60%. Atomized droplets also boost removal, especially at higher temperatures.
Area of Science:
- Environmental Engineering
- Chemical Engineering
- Atmospheric Science
Context:
- Coal combustion is a major source of fine particulate matter (PM2.5).
- Effective removal of PM2.5 is crucial for air quality and public health.
- Gas moisture conditioning is explored as a method to improve PM2.5 capture.
Purpose:
- To investigate the impact of two gas moisture conditioning methods (steam addition and atomized droplets) on PM2.5 removal efficiency.
- To analyze the effects of particle size, steam/droplet addition, and gas temperature on removal performance.
Summary:
- Steam addition improves PM2.5 collection efficiency through condensational enlargement, particularly for particles smaller than 0.3 micrometers, with efficiency increasing by 60% for particles from 0.03 to 0.3 micrometers.
- Atomized droplet addition enhances PM2.5 removal efficiency by up to 30% as gas temperature increases from 136°C to 256°C.
- Real-time particle size distribution and number concentration were measured using an electrical low-pressure impactor (ELPI).
Impact:
- Findings demonstrate that steam addition is highly effective for PM2.5 removal, independent of gas temperature.
- Atomized droplets offer significant removal improvements at elevated temperatures, suggesting optimized application based on flue gas conditions.
- This research provides valuable insights for developing advanced air pollution control technologies for coal-fired power plants.
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