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A MODELING AND EXPERIMENTAL STUDY OF THE CONVERSION OF TRONA TO INCREASE ITS REACTIVITY WITH SO 2IN DRY INJECTION SYSTEM

CHO, KYUNGMIN JACOB
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1185822434

Abstract Details

2007, PhD, University of Cincinnati, Engineering : Environmental Engineering.
Coal has been widely used as primary energy sources including petroleum and natural gas in the United States. Approximately 90% of coal in the United States is attributed to the generation of electricity. Furthermore, due to low cost of coal, the developing countries also generate electricity mainly by coal‐fired power plants. However, coal contains high level of sulfur, ranging from less than 1 % to 10 %, which exists as sulfides, sulfates, pyrite, and organic forms. These sulfur content in coal causes emission of sulfur dioxide (SO 2) through exhaust gas of power plants during coal burning process. In the United States, approximately two third of all SO 2comes from electric power generation that relies on burning fossil fuels like coal 1. As a consequence, the stringent regulatory has regulated the exhaust gas from power plants, resulting in having them equip with flue gas desulfurization technologies. Accordingly, a variety of Flue Gas Desulfurization (FGD) processes has been developed for reducing SO 2exhausted from power plants. These FGD technologies employ various sorbents such as limestone (CaCO 3), lime (CaO), calcium hydroxide (Ca(OH) 2), dolomite (CaCO 3•MgCO 3), magnesium oxide (MgO), sodium carbonate (Na 2CO 3), and sodium bicarbonate (NaHCO 3) for the reduction of SO 2. Among various sorbents used in FGD technologies, in spite of its lower reactivity, calcium hydroxide is most widely used as sorbent because of the lower cost. According to the previous studies, sodium bicarbonate is more efficient in removing SO 2than calcium hydroxide, sodium carbonate or natural trona (Na 2CO 3•NaHCO 3•2H 2O). However, sodium bicarbonate is not as cost efficient as calcium hydroxide or natural trona which is relatively abundant in nature. Since natural trona is composed of approximately 46% sodium carbonate and 36% sodium bicarbonate, a cost‐effective sorbent would be generated by converting sodium carbonate of raw trona to sodium bicarbonate. Hence, the first objective of the study was to develop a cost‐effective method of converting Na 2CO 3of raw trona to NaHCO 3to achieve more efficient removal of SO 2in dry injection systems. Another objective of this study was to elucidate the underlying kinetics and mechanism of how trona decomposes to Na 2CO 3as it reacts with SO 2in a fabric filter collector. Finally, based on the kinetics and mechanism, a model for SO 2removal by trona injection in a fabric filter collector was proposed.
Dr. Tim Keener (Advisor)
211 p.
Engineering, Environmental
SO 2; trona; conversion; NaHCO 3; Na 2CO 3; Modeling; Kinetics

Recommended Citations

Citations

  • CHO, K. J. (2007). A MODELING AND EXPERIMENTAL STUDY OF THE CONVERSION OF TRONA TO INCREASE ITS REACTIVITY WITH SO 2IN DRY INJECTION SYSTEM [Doctoral dissertation, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1185822434

    APA Style (7th edition)

  • CHO, KYUNGMIN JACOB. A MODELING AND EXPERIMENTAL STUDY OF THE CONVERSION OF TRONA TO INCREASE ITS REACTIVITY WITH SO 2IN DRY INJECTION SYSTEM. 2007. University of Cincinnati, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1185822434.

    MLA Style (8th edition)

  • CHO, KYUNGMIN JACOB. "A MODELING AND EXPERIMENTAL STUDY OF THE CONVERSION OF TRONA TO INCREASE ITS REACTIVITY WITH SO 2IN DRY INJECTION SYSTEM." Doctoral dissertation, University of Cincinnati, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1185822434

    Chicago Manual of Style (17th edition)

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This open access ETD is published by University of Cincinnati and OhioLINK.