engleski

A novel method for finding optimal heat recovery steam generator heat exchangers layout

A new method of determining an optimal heat recovery steam generator (HRSG) heat exchangers layout and its operating parameters is presented in this paper. A robust mathematical model is developed where an arbitrary steam pressure levels and steam reheater levels can be set up. Method takes into consideration all the possible heat exchanger layouts, both in serial and parallel heat exchanger position between different steam pressure levels or steam reheater levels. In this paper the maximum thermodynamic efficiency of the steam turbine cycle was set as the objective function. The results show that the optimal high pressure in HRSG’s without reheating is in the region of subcritical pressures while in HRSG’s with reheating, optimal high pressure is in the region of supercritical pressures. It is proven that, in a case of similar water or steam temperature profiles in the heat exchangers of different steam pressure levels or reheaters level, from a thermodynamic aspect it is justified to use parallel heat exchangers arrangement.

combined power plant; bottom steam cycle; heat recovery steam generator; pinch point; optimal heat exchangers layout; optimal operating parameters

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