Question

Steam at 6.2 MPa and 480°C enters the turbine of a steam power plant operating under a regenerative Rankine cycle. Extractions for feedwater heating occur at 3 MPa and 1.4 MPa, with the remaining steam expands to a condenser pressure of 7 kPa. For a steam flow of 55 MTPH from the boiler, determine (a) the mass flow rate of bleed steam, in kg/hr, (b) the turbine power output, in MW, (c) the volume flow rate of cooling water utilized by the condenser, in m³/hr, if the allowable temperature rise of cooling water is 15°C, and (d) the plant heat rate, in kJ/kWh,

Answer 1

(a) The mass flow rate of bleed steam, in kg/hr, is 400

(b) The turbine power output, in MW is 28.9

(c) The volume flow rate of cooling water utilized by the condenser, in m3/hr is 302

(d) The plant heatrate, in kJ/kWh is 1.41

All of these quantities can be calculated by using the steam tables. The steam tables have a lot of information that is a lot for this answer but it is possible to find the answer using them.