combustion 234 biomass 45 simulation and modelling 43 fuels (chemistry) 19 combustion physics 17 air pollution 16 wastes 15 more ... coal 14 issues 12 steam boilers 11 internal combustion motors 11 fluid boilers 10 imissions 10 waste disposal services 10 optimization 10 combustion products 10 heating 10 pyrolysis 9 biofuels 8 power engineering 8 physical chemistry 8 solid fuel boilers 8 carbon dioxide 8 mechanical engineering 8 solid fuels 7 compression ignition engines 7 exhaust gases 7 brown coal 6 unconventional energy sources 6 recycling of wastes 6 less ...