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Environmental Engineering Research 1998;3(2): 105-113.
Kinetic Study of Limestone Calcination and Sulfation Reaction Under AFBC Environment
Hyung-Taek Kim, and Hyuk-Bo Kwon
1Dept. of Energy, Ajou University Wonchon-dong san-5, Paldal-gu, Suwon, 442-749, Korea
2Dept. of Environmental Protection, Kyungnam University, Masan, Korea
Corresponding Author: Hyung-Taek Kim ,
Received: November 12, 1997;  Accepted: May 11, 1998.
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ABSTRACT
Limestone as a SO2 sorbent in AFBC process, was subject to bench scale testing under gaseous environment typical to those experienced in the actual AFBC power plant These environments were generated in the bench-scale, tubular reactor with a gas mixture of O2, CO2, H2O, N2 and SO2. The limestone was rapidly injected into the reactor to simulate shock treatment and subsequently extracted from the reactor under a dry N2 cooling procedure. These treated samples were then analyzed to obtain weight change, porosity and pore size distribution as a function of the composition of the calcining or sulfating gas environment, the time of calcination or sulfation and the reaction temperature. Chemical and physical properties of the treated limestone are investigated and discussed with the relationship with the properties of the untreated limestone. Activation energies and reaction orders for calcination and sulfation reactions of limestone are calculated as a function of limestone particle size of 0.2-0.6, 1.0-1.7, 2.0-2.4, respectively and in the temperature range of 750-950℃. These shock calcination and sulfation experiments were conducted to evaluate the effects of limestone particle size, temperature, gas concentration and velocity, and time of exposure to the test conditions. Acquisition of data during and subsequent to the tests provided microstructural and kinetic information on calcination/sulfation reactions and on limestone physical/chemical properties which is important in Ca utilization in the AFBC plant.
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