Unformatted text preview: 1 bar. Assuming that the approach velocity of the steam is negligible, how fast does the steam exit the nozzle? (5) Your first task as a newly graduated ChemE is to design a boiler to produced saturated steam at 300 °C. Because energy costs money, you decide to use “waste” hot water streams already in the plant to feed the boiler. The two waste liquid streams available (120 kg/hr @ 60 °C and 180 kg/hr at 90 °C) are mixed and fed to the boiler; steam leaves the boiler through a 5 cm pipe. Answer the following questions and make sure to state your assumptions: a) What is the boiler outlet pressure? b) What is the steam velocity coming out of the boiler? c) If electricity is roughly $0.05 per kW-hr, how much does it cost to operate the boiler per day ?...
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- Fall '09
- Chemical Engineering, stream, boiler outlet pressure, flash vaporization drum