In the start up of a combined power plant we have 3 hrsg working each at 100 mw and we are on a position control mode with bypass open . The turbine control valve is set at 98 MW load and the bypass pressure set point is 70 bar . my question is if we change the pressure of set point to 80 bar ( for example), the bypass will closes a little to achieve the new pressure , also the control valve will repond to this new change , but how about flow rates ? I know it will decrease in the path of bypass but will it increase in the path of turbine ? Does the increase of pressure will affects the flow rate from the boilers drums taking in consideration that the load of the gas turbines are constant ?
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