This work concerns a novel concept of diesel engine, which was invented, developed and investigated in Technical University of Radom. The concept consists in dual fuelling: a base fuel, which in the first approach-is diesel fuel (DF) and-in the second approach – rape oil methyl ester (RME) is injected by the standard fuel system and additionally ethanol is injected into inlet port during suction stroke, in order to enhance burning of DF/RME fuel droplets. Before self-ignition of DF/RME ethanol forms with air homogeneous mixture. After ignition by burning DF or RME droplets (which have self-
The hot gases from the recirculation cyclones are cooled initially in a heat recovery steam generator and finally in combustion air preheaters. The cooled gases are exhausted to the atmosphere via the induced draught fan and stack. The steam from the heat recovery steam generator goes to the turbine control valve and is expanded in the steam turbine. The steam turbine has facilities for steam extraction to allow for transfer of steam to the feedwater heaters and to the deaerator tank. The low pressure steam from the steam turbine is condensed and the condensate is pumped by the low pressure (LP) pump through the LP heater to the deaerator tank and the high pressure (HP) pump through the HP heater, before reaching the heat recovery steam generator and completing the steam cycle.
 Simulation Results
The two power plants were modelled using the ECLIPSE process simulation software and technical, environmental and economic analyses made. The larger scale 1000 MWth CFBC was assessed when fuelled by a high-ash, medium sulphur Puertollano coal, and also when co-fired with 8% (by thermal input) with biomass. The 80 MWth CFBC was analysed when fuelled by the same amount (and type) of biomass as in the 1000 MWth plant.