Pyrolysis Characteristics and Correlation Analysis with the Major Components of Seven Kinds of Nutshell

[ Objective ] Nutshells are important forest biomass resources for energy in China. In order to provide theoretic supports for the thermal conversation and utilization of nutshells,the pyrolysis characteristics of nutshells and the correlations of cellulose,hemicellulose and lignin were investigated in this study. [ Method] The cellulose, hemicellulose and lignin contents of seven kinds of nutshells, including Camellia shell, Coconut shell, Tung shell, Walnut shell, Chestnut shell, Pistachio shell and Cashew nut shell, were measured. Using the thermogravimetric analysis the correlations between pyrolysis peak temperature and the cellulose, hemicellulose and lignin content of nutshells were also analyzed. [ Result ] The major components of the six kinds of nutshell except Cashew nut shell are cellulose, lignin and hemicellulose, and the total content of these three components is more than 73% , while the total content of that in Cashew nut shell is only 47.41%. Several mass loss peaks are observed on temperature range from 200 to 410℃ during the whole pyrolysis process for six kinds of nutshells except Tung shell. Obviously pointed pyrolysis peaks on the left of the maximum pyrolysis peaks are appeared for Coconut shell, Camellia shell, Pistachio shell and Cashew nut shell, while for Walnut shell and Chesnut shell, acromion pyrolysis kinetic equations ranged in 40 – 85 of all seven kinds of nutsh pe ell kJ.mol-1 The correlation b aks on the left of the maximum pyrolysis peaks are found. The pyrolysis s meet first-order kinetic equation, and the pyrolysis activation energy is etween the maximum pyrolysis peak temperature and the lignin content ofnutshells is significantly positive (R = 0. 800, P = 0.03 〈 0.05 ) , the correlation between the maximum pyrolysis peak temperature and the cellulose content of nutshells is weakly positive (R = 0. 446, P = 0.32 〉 0.05 ), and that between the maximum pyrolysis peak temperature and the hemicellulose content of nutshells is weakly positive too (R = 0. 509, P=0