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- W219905855 abstract "The current research program is directed to study the effects of preignition on pulverized-coal combustion. The objectives of the program are to: optimize the reactivity of the coal char with respect to variations in the pore structure that occur during pretreatment; and develop a porous transport theory that can be used to extract the dominant primary and secondary chemical reactions from existing pyrolysis data. The data obtained for Texas Lignite suggest that porosity (hence reactivity) is strongly dependent on the final pyrolysis temperature with the maximum porosity occurring at 1300 K. The data also indicate that, to a lesser extent, the heating rate affects pore structure. Higher heating rates increase the relative number of large pores and can enhance reactivity by a factor of two. Hence, the optimum pore structure for char reactivity may be obtained by preparing char at 1300 K and high heating rates (> 1000 K/s). Such chars could be four times as reactive as chars prepared at 2000 K and 1 to 10 K/s. Typical experiments involve heating coal particles to various final temperatures at different heating rates. The resulting char is collected and subjected to analysis for pore distribution within the char. The primary functionmore » of the experimental program is, as discussed, the determination of the optimum pretreatment process for the enhancement of char reactivity. The second primary function of the experimental program is to direct and verify a theoretical model of pore evolution and volatile species transport.« less" @default.
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- W219905855 date "1982-12-01" @default.
- W219905855 modified "2023-09-26" @default.
- W219905855 title "Effects of preignition on pulverized-coal combustion. Final report, 19 September 1980-30 September 1982" @default.
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