7 types of hardwood chips commonly used in sulfate pulp mills in southern China were cooked by laboratory kraft pulping(KP)process.The various hardwood chips were cooked to Kappa value about 18 by KP.Analysis the components and recoverable heat energy from black liquor of per unit of wood(Q)of black liquor.Analysis the linear regression relationship between the weighted experimental value(Qs)and production measurement(QN)of recoverable heat value of black liquor under mixed cooking conditions,and a relevant prediction model was established.The results showed that the Q values of Hainan eucalyptus and Australian eucalyptus globulus were the highest,reaching 490 kcal/kg and 468 kcal/kg,respectively,Q value of Vietnamese acacia was the lowest,only 157 kcal/kg,other Q value of tree species ranged from 244～304 kcal/kg.The functional relationship between QN(y)and Qs(x)was obtained as y=0.672x-121.41.Using the model to predict the black liquor properties of the new raw material,the error of the prediction result was less than 5 kcal/kg,indicating that the model could be used to predict the heat value of the black liquor obtained from the KP process of mixed hardwood chips in industrial production.
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