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- W2548342018 abstract "Two types of kinetic models have been proposed as the rate law for high pressure char oxidation. The first, an nth order rate expression in the form of r = A exp(-Ea/RT) COs n where COs is the oxygen concentration at the external surface of the burning particle, was the assumed model for the work of Monson et al.(2). They obtained data in a high pressure drop tube reactor using conditions from 1400 to 2100 K, 5% to 21% O2 and 1 to 15 atmospheres. Their data showed a significant pressure dependence on the apparent rate coefficients (A and Ea) using an assumed oxygen reaction order of n = 0.5. Their conclusion was that the nth order rate expression was not adequate at high pressure conditions (2). The second type of kinetic model that has been used is a Langmuir expression of the form rin = kCO2/ (1+ KCO2). Essenhigh and Mescher (3) attempted to apply this model to the data of Monson et al. by using a so-called “second effectiveness factor” and were able to predict Monson’s data within a factor of two. Croiset et al. (4) performed experiments in a fixed-bed reactor from 2-10 atmospheres and 850-1200K with a bituminous coal char, and showed a decrease in pre-exponential factor with increasing pressure and a very weak total pressure effect above 6 atm. Ranish and Walker (5) studied graphite combustion and used the Langmuir model to explain changes in apparent activation energy and reaction order with changing temperature (733 to 842 K) and pressure (1 to 64 atm). Their data showed a slight decrease in oxygen order with increasing temperature. In light of the limited high pressure kinetic data available and the conflicting conclusions resulting from the data that are available, it is clear that there is a need for extensive studies of the kinetics of char oxidation at high pressure. The objective of this study is to determine the intrinsic (low temperature) high pressure kinetic rate expression for char oxidation over a range of char types and char preparations. Specifically, since this is still a work in progress, the objective of this paper is to report the effect of pressure on the char oxidation kinetics of Pittsburgh #8 char." @default.
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- W2548342018 title "KINETICS OF HIGH PRESSURE CHAR OXIDATION" @default.
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