QUESTION 4
4. What is the function of a condenser in a steam power plant?
2 A steam plant produces steam at a pressure of 2,95MPa and a rate of 5165 k(g)/(h). The feed water temperature is 96,7deg C, while the steam is 3,18% wet at the evaporator exit. At the superheater exit, steam with a heat capacity of 2,3k(J)/(k)g.K and a temperature of 271,46 is fed into a turbine, which develops 3,618MW of power. Fuel with a calorific value of 33,61M(J)/(k)g flows in at 498k(g)/(h). The atmospheric temperature is 24,7deg C. Flue gases at a temperature of 289deg C are produced at a rate of 19,43kg for each kilogram of fuel burnt. The flue gases have a heat capacity of 1,06k(J)/(k)g.K.
Use steam tables and determine the following:
4.2.1 The heat lost of the flue gases per kilogram of fuel; express it as a percentage of supplied energy
4.2.2 The specific enthalpy of the feed water at the evaporator exit and a: the turbine inlet
4.2.3 The evaporator thermal efficiency, the plant thermal efficiency anc the plant mechanical efficiency
QUESTION4
4.1
What is the function of a condenser in a steam power plant?
42
A steam plant produces steam at a pressure of 2,95 MPa and a rate of 5 165 kg/h.The feed water temperature is 96,7C,while the steam is 3,18% wet at
The flue gases have a heat capacity of 1,06 kJ/kg.K. Use steam tables and determine the following:
4.2.1
percentage of supplied energy
4.2.2
the turbine inlet
4.2.3
the plant mechanical efficiency
