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- W1555291269 abstract "It has been established that mass transport in pores of molecular dimensions in coals and coal chars is an activated process. The rate of activated diffusion under typical coal processing conditions can be at least an order of magnitude slower than Knudsen diffusion, and, of course, even slower in comparison to ordinary bulk diffusion. The current project is concerned with the development and application of a new technique to measure micropore diffusion under actual gasification conditions. The method is an outgrowth of and related to the transient kinetics approach to the measurement of kinetic rate parameters for char-gas reactions that has been developed in our laboratory. It can be shown that the initial transient behavior of a species introduced as a step-function into a ''gradientless'' reactor in which char is present, is controlled by the transport resistance offered by the char micropores. Therefore, this data can be analyzed for micropore diffusion time constants. In addition, due to the time-resolved nature of the process in the reactor, the initial diffusion step is separated (in time) from any subsequent gas-solid reaction steps. Therefore, diffusion measurements can be performed under gasification conditions. Since the primary experimental variables to be examined in this study,more » other than gas species type, are pressure and temperature, we have considered the potential effects of these variables on our data. The new contribution to this area from our work will be in measuring activation energies and other appropriate model parameters under reactive conditions. The development of a numerical model of activated diffusion in char micropores has also been undertaken and is intended as a tool for comparison and interpretation of the data. The principal technique is a Monte Carlo method whereby the diffusion process is simulated by the random motion of gas phase species in a randomly constructed pore network.« less" @default.
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- W1555291269 date "1987-01-01" @default.
- W1555291269 modified "2023-09-27" @default.
- W1555291269 title "Microprobe diffusion in coal chars under reactive conditions: Annual topical report, 15 September 1986-15 September 1987" @default.
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