Key factor in rice husk ash/CaO sorbent for high flue gas desulfurization activity

被引:45
作者
Dahlan, Irvan [1 ]
Lee, Keat Teong [1 ]
Kamaruddin, Azlina Harun [1 ]
Mohamed, Abdul Rahman [1 ]
机构
[1] Univ Sains Malaysia, Sch Chem Engn, Nibong Tebal 143005, Pulau Pinang, Malaysia
关键词
D O I
10.1021/es061136l
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Siliceous materials such as rice husk ash (RHA) have potential to be utilized as high performance sorbents for the flue gas desulfurization process in small-scale industrial boilers. This study presents findings on identifying the key factor for high desulfurization activity in sorbents prepared from RHA. Initially, a systematic approach using central composite rotatable design was used to develop a mathematical model that correlates the sorbent preparation variables to the desulfurization activity of the sorbent. The sorbent preparation variables studied are hydration period, x(1) (6-16 h), amount of RHA, x(2) (5-15 g), amount of CaO, x(3) (2-6 g), amount of water, x(4) (90-110 mL), and hydration temperature, x 5 (150-250 degrees C). The mathematical model developed was subjected to statistical tests and the model is adequate for predicting the SO2 desulfurization activity of the sorbent within the range of the sorbent preparation variables studied. Based on the model, the amount of RHA, amount of CaO, and hydration period used in the preparation step significantly influenced the desulfurization activity of the sorbent. The ratio of RHA and CaO used in the preparation mixture was also a significant factor that influenced the desulfurization activity of the sorbent. A RHA to CaO ratio of 2.5 leads to the formation of specific reactive species in the sorbent that are believed to be the key factor responsible for high desulfurization activity in the sorbent. Other physical properties of the sorbent such as pore size distribution and surface morphology were found to have insignificant influence on the desulfurization activity of the sorbent.
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收藏
页码:6032 / 6037
页数:6
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