combustion biomass 45 simulation and modelling 43 fuels (chemistry) 23 combustion physics 17 coal 16 air pollution 16 more ... wastes 13 issues 12 internal combustion motors 12 steam boilers 11 heating 11 fluid boilers 10 imissions 10 optimization 10 combustion products 10 solid fuel boilers 9 waste disposal services 9 biofuels 8 power engineering 8 physical chemistry 8 carbon dioxide 8 pyrolysis 8 mechanical engineering 8 thermodynamics 7 solid fuels 7 brown coal 6 boilers 6 heat-generating plants 6 environmental pollution 6 less ...