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- W91284116 abstract "Interest in char combustion derives from the need to utilize the char produced during some gasification processes. Successful use of char in combustion may depend on use with supplementary fuel. The critical factor determining this appears to be the char reactivity which may be variations in intrinsic reactivity depending on differences in thermal history, or it may be dependent on differences in internal surface. In preparation for an experimental program to determine the relative significance of these alternatives (or others), what are considered relevant contributions in the existing experimental literature have been re-evaluated. Although overall surface reaction rates have been evaluated for many coal chars there appears to have been a fundamental omission in the kinetic analysis, and an attempt to remedy this has been made. The picture now developed is that of char particles that may burn either in Zone I or Zone II depending on the particle permeability. Zone III combustion is not encountered with particles below about 100 microns. In Zone I and II combustion, however, the intrinsic reaction is evidently a zero order, high activation energy process (E about 45 kcal) at temperatures in the region of 1000/sup 0/K, changing to a first order, low activationmore » energy process (E about 7 kcal) at temperatures approaching 2000/sup 0/K, with both processes significant in the transition range between the two limits. This new evaluation modifies the conventional views of reaction order and activation energies.« less" @default.
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- W91284116 date "1976-01-01" @default.
- W91284116 modified "2023-09-27" @default.
- W91284116 title "Problems in pulverized coal and char combustion" @default.
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