Study on Optimization of HRSG in IGCC System

Heat recovery steam generator (HRSG) is a thermal equipment contacting gas cycle with steam cycle, and it play a connecting link role, its reasonable selection and matching of process and parameters has an important effect on the whole IGCC system. The 200 MW IGCC system model was established first, then IGCC systems with double pressure, double pressure reheat, three-pressure and three-pressure reheat HRSG were calculated and compared, the three-pressure reheat HRSG system is the best process was obtained. Aiming at three-pressure reheat HRSG system, the matching schemes of HRSG with waste heat cooler were reasonably designed according to cascade utilization of energy, and the system gross power, system efficiency, steam turbine power and heat rate of different schemes were compared, the best matching scheme was obtained.