THERMAL INTEGRATION OF WASTE HEAT IN COAL-FIRED UNITS WITH POST-COMBUSTION CARBON CAPTURE

摘要

Computer simulations were performed on a pulverized coal-fired steam cycle unit with post combustion carbon capture to determine the effects on unit performance of using waste heat from the CO_2 compressor and stripper condenser to predry coal, preheat boiler feedwater and regenerate CO_2 solvent. The unit modeled includes a pulverized coal-fired boiler, a regenerative reheat supercritical steam cycle, an MEA post-combustion carbon capture system and an inline CO_2 compressor. The simulations, which were carried out for a lignite, an Illinois bituminous coal and PRB coal show that heat rate reductions of more than ten percent would be possible for some cases. The magnitude of the heat rate improvement would depend on factors such as coal rank, coal moisture content and type of heat sink.