Multi-objective optimization of heat recovery steam generators

In this paper, a multi-objective method is used to optimize a heat recovery steam generator (HRSG). Two objective functions have been used in the optimization, which are irreversibility and HRSGequivalent volume. The former expresses the exergetic efficiency and the latter demonstrates the cost of the HRSG. Decision variables aregeometric and operational parameters of the HRSG. The results of the multi-objective optimization are shown in a famous curve called thePareto curve. The resulting Pareto curve can be used as a decision making tool by designers. Different optimal parameters are presentedfor different weight coefficients in the function. Volume and exergy optimization are special cases of the proposed algorithm. It is alsoshown that thermoeconomic and multi-objective optimizations can also be specific cases of the proposed algorithm if the proper weightcoefficient is used. This weight coefficient depends on local prices of energy and construction costs of the HRSG.

Keywords:

Combined Cycle , HRSG , Multi-objective Optimization , Thermoeconomic