This paper reports on the rate kinetics for the devolatilisation and combustion of bagasse and its char. Devolatilisation is a first order reaction with activation energy around 88 kJ/mol. The combustion reaction has an activation energy of 188 kJ/mol and a reaction order with respect to oxygen of 0.65. These kinetic parameters are similar to those of brown coal. These parameters were used in a boiler model, whose output shows encouraging agreement with available plant measurements