,12 Ignition and Combustion Reaction
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Proximate analysis is used to quantify the amounts of moisture, volatile matter, fixed carbon, and ash contents. The amounts of moisture and volatile matter contents of a sample of solid fuel are evaluated by measuring the weight losses in air at 107 6 28C for 1 h and in an inert gas at 900 6 208C for 7 min., respectively. The amount of fixed carbon content is supposed to correspond to the weight loss after further heating in air at 815 6 108C for 1 h, and the residual is regarded as ash. Thus, the dried sample consists of combustible matter and ash, and the combustible matter comprises volatile matter, which easily volatilizes to the gas phase, and fixed carbon, which remains in the char even at high temperature.