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Abstract

A calorimetry system for measurement of the heating value of coal, having a combustor 24 and a mixing unit 30 wherein heat from combustion gases is transferred to air. The system has a gravimetric feeder 64 for providing coal at a measured mass feed rate; the coal including any moisture present therein. The coal is pulverized in an air-driven mill or pulverizer 14 which is fed coal from the feeder and is separated by a cyclone separator 16 into two streams; one carrying coal and air mixed together in a controlled ratio to the combustor. The air which drives the separator, together with fines of the coal and moisture is fed to an afterburner 26 of the combustor so that the thermal dynamics of the entire coal stream is involved in the heating value measurement. The gravimetric feeder is especially adapted for use in the calorimetry system since the length of the body 260 of coal on the belt is precisely controlled by limiting the angle of repose of the coal where it leaves the belt through the use of a head end pulley 204 of minimum diameter and a shaper 262 disposed above the head pulley which engages the leading edge of the body of coal.

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First Claim