Relationship between pressure fluctuations and generation of organic pollutants with different particle size distributions in a fluidized bed incinerator.
The hydrodynamic behaviors of fluidization perhaps significantly influence the uniformity of fluidization in fluidized bed incinerator. Good uniformity of fluidization expressed the air across uniformly through the bed and the particles being distributed well in the fluid stream. The aggregates, flocs and channels of particles do not happen during fluidization. The Good uniformity will maintain high heat and mass distribution to improve reaction efficiency. These parameters include the height of static bed, gas velocity, mixing and distribution of bed particle, which have rarely been studied in previous investigations. Consequently, this study examines how the hydrodynamic parameters affect the generation of organic pollutants (BTEXs and PAHs) during incineration. The statistical and power spectral analysis of the measured pressure fluctuation during incineration are used to elucidate the relationship between behaviors of fluidization and generation of pollutants during incineration. Experimental results show the organic concentration does not increase with uniformity of fluidization decreasing. The reason may be the explosion of the gas and the consequent thermal shock destroy the coalescent bubbles to form small bubbles again and enhance the efficiency of transfer of oxygen to increase combustion efficiency. Additionally, the mean amplitude and fluidized index of pressure fluctuation similarly vary with the concentration of organic pollutants. These two indices can be used to assess the efficiency of combustion. The four particle size distributions could be divided into two groups by statistical analysis. The Gaussian and narrow distributions belong to one group and the binary and flat the other. The organic concentration of the Gaussian and narrow distributions are lower than that of the other distributions. Consequently, the bed materials should maintain narrow or Gaussian distributions to maintain a good combustion efficiency during incineration.
Department of Environmental Engineering, National Chung-Hsing University, 250 Kuo-Kuang Road, Taichung 402, Taiwan, ROC.
Chiou-Liang
CL
Lin
Ming-Yen
MY
Wey
Han-Tsung
HT
Cheng
D001555:Benzene Derivatives / Q000138:chemical synthesis*; D002849:Chromatography, Gas; D004785:Environmental Pollutants / Q000138:chemical synthesis*; D017745:Incineration / Q000379:methods*; D010316:Particle Size; D011084:Polycyclic Aromatic Hydrocarbons / Q000138:chemical synthesis*; D011312:Pressure
D001555:Benzene Derivatives; D004785:Environmental Pollutants; D011084:Polycyclic Aromatic Hydrocarbons