Table 2 Biomass combustion reactions
From: Modelling and simulation of wood chip combustion in a hot air generator system
Reaction | Chemical reaction | Reaction rate (kg/m3 s) |
|---|---|---|
Drying | \(wet\;biomass \to dry\;biomass + {\text{H}}_{2} {\text{O}}_{\left( g \right)}\) | \(r_{dry} = 5.6.10^{6} \exp \left( {\frac{ - 10584}{ts}} \right)\left( {1 - \varepsilon_{b} } \right)\rho_{s} Y_{{{\text{H}}_{2} {\text{O}},s}}\) |
Devolatilization (Yang et al. 2005) | \(dry\;biomass \to volatile\;gas + char\) | \(r_{pr,i} = 7.10^{4} \exp \left( {\frac{ - 9977}{ts}} \right)\left( {1 - \varepsilon_{b} } \right)\rho_{s} Y_{i,s}\) |
Char combustion (Jurena 2012) | \(char + \alpha {\text{O}}_{2} \to 2\left( {1 - \alpha } \right){\text{CO}} + \left( {2\alpha - 1} \right){\text{CO}}_{2}\) | \(r_{char} = A_{p} \left( {\frac{{{\text{C}}_{{{\text{O}}_{ 2} }} }}{{\frac{1}{{k_{r} }} + \frac{1}{{k_{d} }}}}} \right)\) \(k_{r} = 290t_{s} \exp \left( {\frac{ - 10344}{ts}} \right)\) \(\frac{\text{CO}}{{{\text{CO}}_{2} }} = 33\;{ \exp }\left( {\frac{ - 4700}{ts}} \right)\) |