Does adding or removing water at temperatures within the normal range improve or reduce the efficiency of the unit?
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For example: the water supply pressure is 10 Mpa, the temperature is 200°C, and the enthalpy is 856 KJ/KG. The steam at the exit of the turbine has a pressure of 8.3 Kpa, a temperature of 42.3°C, and an enthalpy of 2578 KJ/KG. I would like to know what the impact of adding or removing cooling water is on the efficiency of the boiler-turbine unit, while ensuring that the temperature remains within normal ranges
Is there anyone who can answer this question?
Since the desuperheating water is taken from the boiler feedwater, increasing the amount of desuperheating water leads to a decrease in the water flow entering the economizer, which raises the exhaust temperature of the boiler and reduces its thermal efficiency. This is just one of the reasons; generally speaking, an increase in the amount of water used for cooling will certainly lead to a certain decline in the boiler’s thermal efficiency.