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A dynamic mathematical model of ash deposit growth and shedding on a horizontal cooled probe in a straw fired grate boiler has been developed and validated. The model includes submodels of deposition (impaction, thermophoresis, Brownian and eddy diffusion, and condensation) and shedding by deposit surface melting. Three new submodels describing deposit formation on the downstream side of the probe,...
Mechanisms of nitric oxide (NO) formation and reduction in fixed-bed combustion of straw have been modeled mathematically and verified experimentally. The model for the straw combustion and nitrogen chemistry consists of sub-models for evaporation, pyrolysis, tar and char combustion, nitrogen conversion, and energy and mass conservation. Twenty chemical reactions are included, of which 12 belong to...
Straw is being used as main renewable energy source in grate boilers in Denmark. For optimizing operating conditions and design parameters, a one-dimensional unsteady heterogeneous mathematical model has been developed and experiments have been carried out for straw combustion in a fixed bed. The straw combustion processes include moisture evaporation, straw pyrolysis, gas combustion, and char combustion...
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