SP18

– The boilers at Purdue’s Wade Utility Plant

produce steam at 600 psig (~4.2 MPa)

Question

SP18 – The boilers at Purdue’s Wade Utility Plant produce steam at 600 psig (~4.2 MPa)

and

825 F (~440°C). After partial expansion through the turbine generator, steam at 15 psig (~205

kPa) and 350 F (~175°C) and at 125 psig (~960 kPa) and 530 F (~275°C) is bled off and routed to campus for heating and processing.

[https://stemedhub.org/resources/772/download/What_Would_It_Take_To_Power_Purdue_University.pdf]

Assume that one of the boilers feeds one of the turbines 120,000 lb/hr of steam. This is about 15 kg/s. Also assume that 15% of the ~4 MPa/440°C flow is bled off to the ~1000 kPa/~280°C line and an additional 10% is bled off to the ~200 kPa/~160°C line. The remaining 75% exits the turbine at a pressure of 0.1 bar and a quality of 90%.

What is the turbine power rate? Report your answer in MW.

Mechanical Engineering