Abstract
A continuous autothermal two-stage pyrolysis/partial combustion process has been tested at the bench scale. Coal (or oil shale) up to 5 kg/h is fed to a spouted bed pyrolyzer in which the volatiles are driven off for tar recovery. Part of the resulting char is passed to a spouted bed partial combustor which produces the hot flue gas to provide heat and a spouting medium in the pyrolyzer. The two reactors are placed in a compact vertical configuration. The process is tested on two coals of different rank, and on oil shale. The effect of prime operating variables on yield are established and a number of operating modes demonstrated.
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