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5 Modelling of HRSG 5.1 HRSG temperature profiles and steam generation. Starting point for the engineering of the HRSG is the evaluation of the steam temperature profile and gas and steam generation function. For firing steam generator convention alone can be from assuming an outlet gas temperature and steam flow rate desired to calculate the required amount of supplementary fuel to meet the demand for steam. Due to a lower inlet gas temperature and a large gas/steam ratio, the unfired HRSG behaves differently. If assuming arbitrary gas temperature or steam generation rate, "temperature cross situations" may occur. Figures 5.1 and 5.2 show the generic layout and the temperature profile of a HRSG consisting of economizer, evaporator and superheater at a single pressure. Two variables that affect the steam temperature profile and steam production rate are the approach point and the pinch point temperature difference, as given in Fig. 5.2. The pinch point is the difference between the temperature of saturated steam and the gas temperature leaving the evaporator. Approach point is the difference between the temperature of the water entering the evaporator and temperature of saturated steam. Selection of these two variables will affect the size of the economizer and evaporator heat exchangers and therefore the cost of the HRSG. For typical unfired HRSG hardware that can be built and shipped economically in terms of size and complexity, both the pinch and approach point temperature difference vary between 7 °C to 25 °C, usually [11]. Figure 5.1: Temperature and enthalpy parameters in a HRSG with a steam cycle 24PDF Image | waste heat recovery steam power system for ACE Embilipitiya
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