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The burning of black liquor char was studied using a laboratory char bed reactor. The results show that increasing the O2 concentration in the reactant gas stream and the sulfate concentration in the char increases the burning rate, while increasing the carbonate concentration in char or adding CO* and/or Hz0 to the gas stream did not considerably affect the burning rate. Char bed burning appears to follow two paths. The major path is the combustion of carbon which is controlled mainly by- the rate of 02 mass transfer from the gas to the bed. The minor path is the consumption of carbon as a result of the sulfate reduction reactions.
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Experimental Study of Black Liquor Char Bed Buning, 1998 Engineering Conference Proceedings