Abstract
In order to reduce the environmental smog caused by coal combustion, air pollution control devices have been widely used in coal-fired power plants, especially of wet flue gas desulfurization (WFGD) and wet electrostatic precipitator (WESP). In this work, particulate matter with aerodynamic diameter less than 10 μm (PM10) and sulfur oxides (SOx) have been studied in a coal-fired power plant. The plant is equipped with selective catalytic reduction, electrostatic precipitator, WFGD, WESP. The results show that the PM10 removal efficiencies in WFGD and WESP are 54.34% and 50.39%, respectively, and the overall removal efficiency is 77.35%. WFGD and WESP have effects on the particle size distribution. After WFGD, the peak of particles shifts from 1.62 to 0.95 μm, and the mass concentration of fine particles with aerodynamic diameter less than 0.61 μm increases. After WESP, the peak of particle size shifts from 0.95 to 1.61 μm. The differences are due to the agglomeration and growth of small particles. The SO3 mass concentration increases after SCR, but WFGD has a great influence on SOx with the efficiency of 96.56%. WESP can remove SOx, but the efficiency is 20.91%. The final emission factors of SO2, SO3, PM1, PM2.5 and PM10 are 0.1597, 0.0450, 0.0154, 0.0267 and 0.0215 (kg · t−1), respectively. Compared with the research results without ultra-low emission retrofit, the emission factors are reduced by 1~2 orders of magnitude, and the emission control level of air pollutants is greatly improved.
Highlights
The causes of smog mainly come from air pollutants, such as fine particulate matter (PM, fine PM refers to the particles with aerodynamic diameter less than 2.5 μm), sulfur dioxide (SO2), and nitrogen oxides (NOx)
Li et al [20] carried out a particle emission test on six coal-fired power plants with ultra-low emission, and the results showed that wet electrostatic precipitator (WESP) had a good removal effect on PM>1
This work studies the effects of wet flue gas desulfurization (WFGD) and WFGD on PM and sulfur oxides (SOx) in flue gas after ultra-low emission conversion, and the following conclusions are as follows: (1) WFGD and WESP have good removal effects on PM, with a removal efficiency of 54.34% and 50.39%, respectively
Summary
With the rapid urbanization and economic growth, smog is common in large areas of China in recent years It has adverse effects on people’s health and climate change and has attracted more attention [1]. According to the Analysis of China Statistical Yearbook, 70% of China’s primary energy consumption is coal, of which 75% is used for combustion, while coal-fired power plants (CFPPs) consume about 50%. It will take a long time for China’s coal-based energy structure to change, so the particulate matter emitted by CFPPs has to receive extensive attention [2,3]
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