Power Plant Technology Steam and Gas Cycle Power Plant (Assignment 1)

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Power Plant Technology Steam and Gas Cycle Power Plant (Assignment 1) by Mohamad Firdaus Basrawi, Dr. (Eng) Mechanical Engineering Faculty mfirdausb@ump.edu.my

Example 1 Consider an ideal Rankine cycle shown below. The steam enters turbine at 350ºC and 3 MPa. Then, leaves the condenser at 75 kPa. Determine the cycle thermal efficiency.

Example 2 Consider a non-ideal Rankine cycle. Isentropic efficiency for turbine and pump is 87%. Steam enters the turbine at 500oC and 7 MPa. Then, it enters the condenser and at pressure of 10kPa. The net output of the turbine is 45 MW. Sketch T-s diagram considering saturation lines. Then, mass flow rate of steam and the thermal efficiency of the cycle. are to be determined

Example 3 A steam power plant shown in figure below has a turbine that that has adiabatic efficiency of 87%. If adiabatic efficiency of the pump is 85%, Thermal efficiency of the cycle, and Net power output when mass flow rate is 15 kg/s. are to be determined

CL 1A Consider a steam power plant that operates on a reheat Rankine cycle that has a 140 MW power output. Turbine inlet pressure and temperature for high pressure turbine is 15 MPa and 600°C, respectively. Whereas turbine inlet pressure and temperature for low-pressure turbine is 1 MPa and 600°C, respectively. Condenser operates at a pressure of 10 kPa. The isentropic efficiency of the turbines and pump are 85% and 95%, respectively. Sketch the cycle on a T-s diagram with respect to saturation lines: If steam expanded isentropically in the LP-Turbine and leave the turbine as saturated liquid, determine the steam quality If steam at LP-Turbine outlet is in superheated condition in actual process, determine temperature of the superheated steam. The thermal efficiency. The steam mass flow rate.

Example: Two OPEN Feedwater Heaters for Ideal Regenerative Rankine Cycle Stage 1: Superheated vapor (P1=10MPa). Stage 2: Saturated liquid-vapor mixture (P2= 5MPa, x2= 0.98). Stage 3: Saturated liquid-vapor mixture (P3= 1MPa, x3= 0.80). Stage 4: Saturated liquid-vapor mixture (P4= 0.01MPa) Stage 5: Saturated liquid Condition of steam at outlet of FWHs and condenser is saturated liquid. Since ideal, process at turbine and pump process are isentropic. Sketch T-s diagram. Calculate mass fractions of m1 & m2.

CL 1B Stage 1: Superheated vapor (P1=10MPa, T1=350oC). Stage 2: Saturated liquid-vapor mixture (P2= 5MPa). Stage 3: Saturated liquid-vapor mixture (P3= 1MPa). Stage 4: Saturated liquid-vapor mixture (P4= 0.01MPa) Stage 5: Saturated liquid Condition of steam at outlet of FWHs and condenser is saturated liquid. Since ideal, process at turbine and pump process are isentropic. Sketch T-s diagram. Calculate mass fractions of m1 & m2. If the power plant capacity 100 MW, calculate mass flow rate of the steam. Finally, Calculate its efficiency.