## 3 Results and Discussion
### Analysis Inputs
#### 3.3.2 Biomass:  
For all the biomass outputs, the three most important input parameters are carbon and hydrogen content and the LHV of the fuel (see Table 6). For the first three outputs, 'gross power', 'gross efficiency' and 'CHP efficiency', the 'LHV' has more impact than the 'hydrogen' input. The three parameters together have an impact of 75.99% for the 'FEGT' output, while the impact for the 'adiabatic flame temperature' is 98.81%. For all the others, the sum of the impact is in between these two parameters. For the 'FEGT' output, the input 'carbon-to-soot conversion rate' parameter has an impact of 6.42%. The impact of 'weight percentage ash' (4.76%), 'waterwall radiant flux correction factor' (4.77%) and 'non-uniform radiant flux factor' (4.32%) can also have some impact but are already significantly lower. For all the other inputs, the impact on the outputs is lower than 4%. Comparison of the results of the Sobol' indices for coal and biomass shows that the carbon and hydrogen content of the fuel and the LHV of the fuel are the most impactful input parameters for both. Only for some output parameters of coal, the evaporator steam outlet temperature has also a certain impact, while this input parameter has no influence on the same output parameters in the biomass case. As explained in Paragraph 'Plant Gross Power' in Section 3.2.1, the nominal steam temperature cannot be achieved without decreasing the nominal steam pressure and steam flow rate in the biomass case. It seems that the evaporator steam outlet temperature only has influence on the output parameters when the nominal steam parameters are reached. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline  & **Plant** & **Plant Gross** & **Plant CHP** & **Live Steam** & **Live Steam** & **Adiabatic** & **Effective** \\  & **Gross** & **Electric** & **Efficiency** & **Pressure** & **Flow Rate** & **Flame** & **FGT** & **Radiation** \\  & **Power** & **Efficiency** & **Efficiency** & **Pressure** & **Flow Rate** & **Temperature** & **Temperature** & **Temperature** \\ \hline
**Fuel** & & & & & & & & \\ \hline Solid-fuel-weight percent of moisture & & & & & 1.65 & & 1.53 \\ Solid-fuel-weight percent of ash & 1.04 & 1.17 & 2.39 & & & 1.48 & 5.59 & 2.02 \\ Solid-fuel-weight percent of C & 37.60 & 38.48 & 39.37 & 44.43 & 40.21 & 53.63 & 44.86 & 53.03 \\ Solid-fuel-weight percent of H & 27.07 & 27.06 & 27.40 & 29.21 & 27.36 & 36.71 & 29.23 & 35.90 \\ Solid-fuel-weight percent of S & & & & 2.60 & & & \\ Solid-fuel-specified LHV @ 2 SC & 8.69 & 8.75 & 11.24 & 7.90 & 6.57 & 8.75 & 8.66 & 8.86 \\
**Fumace** & & & & & & & & \\ \hline Evaporator steam outlet temperature & 12.86 & 12.87 & 10.64 & 1.48 & 15.94 & & & \\ Flugas @\(\Omega_{\rm{o}}\) content & & 1.02 & 1.11 & 1.08 & & 1.09 & & 1.05 \\ Waterwall radiant flow correction factor & & & & & & 2.05 & & \\ Carbon-to-so convection rate & & & & & & 2.79 & \\ Ash emissivity percent correction factor & & & & & & 1.17 & \\ Ash particle mean diameter & & & & & & 2.11 & \\ Non-uniform radiant flow factor & & & & & & 2.07 & \\ Radant cooler: minor heat loss & 2.83 & 2.90 & 1.57 & & & & \\ Gas/air safe convective heat transfer & & & & & & & \\ coefficient adjustment factor–SHI & & & & & & & \\ Gas/air side convective heat transfer & 2.64 & 1.97 & 1.02 & 3.96 & 1.19 & & & \\ coefficient adjustment factor–SHZ & & & & & 2.98 & 2.42 & & \\ coefficient adjustment factor–SHS & & & & & & & \\ \hline
**Combustion air** & & & & & & & \\ \hline Rotary air heater: deneliness factor & 2.55 & 2.51 & 1.87 & & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Sobol’ indices in % of the impactful input parameters per output parameter for coal.