Recent investigations of rapid coal pyrolysis have generally been limited to two approaches - entrained flow techniques and heated grid devices. The heated grid techniques provide a more clearly defined time-resolved thermal environment for small particles (60-100 mu m) and allow determination of the volatile species evolved into a cold environment surrounding the grid. Due to the mode of heating of the particles in the grid technique one is limited to the particle size ranges that can be employed. In experiments, a reactor has been constructed in which small samples of coal (20-60 mg) are rapidly injected (approximately 25 msec) into a preheated environment. The injection device allows one to deliver particles as small as 100 mu m or as large as several millimeters in diameter. Injection of the small samples into a preheated zone insures that the particles experience initial heating rates comparable to those expected in coal combustors. The gases produced by the thermal decomposition process are monitored in situ by use of a Nicolet FTIR Spectrometer operated in the rapid scan mode. Experimental data are presented graphically.
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