| Abstract:By analysis the chemical components of various hardwood commonly used in the production of KP mills. The various hardwoods were cooked to Kappa18 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 experimental results showed that the Eucalyptus nitens from Chile and Australia were considered to be excellent pulping materials based on their chemical components. The Q values of Hainan eucalyptus and Australian eucalyptus globulus were the highest, reaching 490 kcal.kg-1 and 468 kcal.kg-1, respectively. The Vietnamese acacia was the lowest, only 157 kcal.kg-1. other tree species ranged from 244~304 kcal.kg-1. 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 less than 5 kcal.kg-1 , indicating that the model can be used to guide production. |