# Influences of the Pretreatments of Residual Biomass on
## 4 Discussion  
Before a detailed discussion of devolatilization results, it is worth to stress that this study aimed to strictly examine the influences from wheat straw pretreatments and devolatilization temperatures on pellets thermochemical behavior. For this reason, tests were carried out in an inert atmosphere and with a unique bed material, devoid of those oxidative properties typical of the OC investigated within CLARA project [5; 10; 15; 31]. In such a way, results did not depend on the type of bed material or any external oxygen supply. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Type of Biomass** & **Species of Gas** & \(\mathbf{m}\) & \(\mathbf{q}\) \\  & & **(Mol Mol N\({}_{\text{2}}\) Free\({}^{-1}\)\({}^{\circ}\)C\({}^{-1}\))** & **(Mol Mol N\({}_{\text{2}}\) Free\({}^{-1}\))** \\ \hline \multirow{4}{*}{WSP-T1} & H\({}_{2}\) & \(1.213\times 10^{-3}\) & \(-7.106\times 10^{-1}\) \\  & C\({}_{3}\)H\({}_{\text{seq}}\) & \(-4.654\times 10^{-4}\) & \(4.514\times 10^{-1}\) \\  & CO & \(8.298\times 10^{-6}\) & \(3.733\times 10^{-1}\) \\  & CO\({}_{2}\) & \(-3.932\times 10^{-4}\) & \(4.429\times 10^{-1}\) \\  & CH\({}_{4}\) & \(-3.631\times 10^{-4}\) & \(4.429\times 10^{-1}\) \\ \hline \multirow{4}{*}{WSP-T2} & H\({}_{2}\) & \(1.217\times 10^{-3}\) & \(-7.064\times 10^{-1}\) \\  & C\({}_{3}\)H\({}_{\text{seq}}\) & \(-4.272\times 10^{-4}\) & \(4.177\times 10^{-1}\) \\  & CO & \(6.025\times 10^{-5}\) & \(3.311\times 10^{-1}\) \\  & CO\({}_{2}\) & \(-4.774\times 10^{-4}\) & \(5.125\times 10^{-1}\) \\  & CH\({}_{4}\) & \(-3.721\times 10^{-4}\) & \(4.450\times 10^{-1}\) \\ \hline \multirow{4}{*}{WSP-T3} & H\({}_{2}\) & \(1.221\times 10^{-3}\) & \(-6.999\times 10^{-1}\) \\  & C\({}_{3}\)H\({}_{\text{seq}}\) & \(-4.802\times 10^{-4}\) & \(4.624\times 10^{-1}\) \\  & CO & \(9.178\times 10^{-5}\) & \(2.936\times 10^{-1}\) \\  & CO\({}_{2}\) & \(-4.400\times 10^{-4}\) & \(4.780\times 10^{-1}\) \\  & CH\({}_{4}\) & \(-3.924\times 10^{-4}\) & \(4.659\times 10^{-1}\) \\ \hline \multirow{4}{*}{WSP-T1W} & H\({}_{2}\) & \(1.255\times 10^{-3}\) & \(-7.466\times 10^{-1}\) \\  & C\({}_{3}\)H\({}_{\text{seq}}\) & \(-5.867\times 10^{-4}\) & \(5.553\times 10^{-1}\) \\  & CO & \(2.963\times 10^{-5}\) & \(3.747\times 10^{-1}\) \\  & CO\({}_{2}\) & \(-3.447\times 10^{-4}\) & \(3.892\times 10^{-1}\) \\  & CH\({}_{4}\) & \(-3.535\times 10^{-4}\) & \(4.274\times 10^{-1}\) \\ \hline \multirow{4}{*}{WSP-T2W} & H\({}_{2}\) & \(1.224\times 10^{-3}\) & \(-7.107\times 10^{-1}\) \\  & C\({}_{3}\)H\({}_{\text{seq}}\) & \(-5.705\times 10^{-4}\) & \(5.420\times 10^{-1}\) \\ \cline{1-1}  & CO & \(1.980\times 10^{-4}\) & \(2.247\times 10^{-1}\) \\ \cline{1-1}  & CO\({}_{2}\) & \(-4.458\times 10^{-4}\) & \(4.715\times 10^{-1}\) \\ \cline{1-1}  & CH\({}_{4}\) & \(-4.053\times 10^{-4}\) & \(4.725\times 10^{-1}\) \\ \hline \multirow{4}{*}{WSP-T3W} & H\({}_{2}\) & \(1.256\times 10^{-3}\) & \(-7.236\times 10^{-1}\) \\ \cline{1-1}  & C\({}_{3}\)H\({}_{\text{seq}}\) & \(-5.044\times 10^{-4}\) & \(4.821\times 10^{-1}\) \\ \cline{1-1}  & CO & \(-3.523\times 10^{-6}\) & \(3.903\times 10^{-1}\) \\ \cline{1-1}  & CO\({}_{2}\) & \(-4.187\times 10^{-4}\) & \(4.457\times 10^{-1}\) \\ \cline{1-1}  & CH\({}_{4}\) & \(-3.295\times 10^{-4}\) & \(4.054\times 10^{-1}\) \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Slopes (\(m\), Equation (7)) and y-axis intercepts (\(q\), Equation (7)) of the regression straight lines of \(Y_{\text{\it,out}}^{p}\) (Equation (5)), \(i=\text{H}_{2}\), CO, CO\({}_{2}\), CH\({}_{4}\), and C\({}_{3}\)H\({}_{8,\text{eq}}\)) for torrefied and torrefied-washed pellets.