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Effects of High Temperature and Combustion on Fluidized Material Attrition in a Fluidized Bed
Lin, Chiou-Liang,Wey, Ming-Yen 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.6
This study investigated the effects of high temperature and combustion conditions on the attrition of fluidized material in a fluidized bed. Silica sand was fluidized in air at an atmospheric pressure between 873 K and 1,071 K. The operating parameters evaluated in investigating the attrition rate of fluidized material included particle size, temperature and both combustion and non-combustion conditions. Experimental results indicated that the total weight of attrition increased with increasing temperature and decreased with increasing particle size. The attrition was higher during the initial fluidization period than the later period, due to the loss of sharp comers and edges of the attrition panicles. The initial and final amition rates during combustion were higher than those in the nonxomhustion condition, because the heat and thermal shock were produced to increase attrition rate during incineration. Comparing the experimental data with previous correlations, that reveals a significant level of error in the prediction results from existing correlations. This error may occur because the experimental equations neglected the operating temperature and particle size.
Chiou-Liang Lin,Tzu-Huan Peng 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.5
This study discusses the impact of different operating parameters on the bed material particle size and heavy metal distribution, and evaluates the impact of bed material heavy metal on the environment through TCLP and Vibrio fischeri test. The experimental results show that the bed material particle size distribution inclines to smaller particle sizes as the operating temperature increases. When there is Na, the particle size increases due to the agglomeration of eutectic. As for the heavy metal distribution, the combination of the fine particle sizes (<0.59mm) with a large surface area and the large particle sizes with multiple eutectics has a higher heavy metal concentration. According to the results of leaching concentration of bed materials with different particle sizes, the heavy metals with large (>0.84 mm) and fine (<0.59 mm) particle sizes have the maximum leaching concentration. As for the biological toxicity, when the temperature is 700 oC or Na concentration is 0.3%, the biological toxicity is at its maximum, which may due to a high accumulation of heavy metals.
Tzu-Huan Peng,Chiou-Liang Lin,Hsien Chen 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.2
We evaluated the effects of Na, K, Ca, and the steam-to-biomass (S/B) ratio on gasification efficiency duringsyngas production. The results show that H2 production was positively correlated with the S/B ratio. However, increasesin the S/B ratio were limited because excessive steam decreased the reactor temperature and hampered the gasificationprocess. Regarding the effects of alkali metals on syngas composition, we found that the addition of either Na or Kincreased the molar percentages of H2 and CO, but decreased CH4 and CO2. The results also clearly show that the additionof Na or K improved the yield of syngas, the carbon conversion efficiency, and the cold gas efficiency. Improvementswere especially pronounced with K. Furthermore, Ca had different interactions with Na and K during gasification. WhenNa and Ca existed simultaneously, H2 production was enhanced.