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Carbon dioxide gasification of kraft black liquor char has been studied in different systems in order to predict the consumption rate of organic carbon. In the present study carbon was gasified by CO2 supplied as a jet impinging on the top surface of a bed of slow pyrolysis black liquor char contained within a tubular furnace. The rate of carbon gasification was determined from the product gas composition using on-line CO/CO2 analysis and GC analysis of gas collected in Tedlar sampling bags. The experimentally determined gasification rates are very low, suggesting that the process is controlled by mass transfer resistances. A shrinking core model modified with a volumetric outflow term was applied to the carbon conversion rates to determine the external mass transfer and “ash” layer resistances of the char bed.
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Measurement of Carbon Dioxide Gasification of Kraft Black Liquor Char in a Laboratory Char Bed React