The design for an advanced electric generating plant will use a Superheated Stea
ID: 1858113 • Letter: T
Question
The design for an advanced electric generating plant will use a Superheated Steam cycle, in which the feed water enters the high temperature heater (usually still called the "boiler") at a pressure above the critical pressure. It is heated to a high temperature, but there is no phase change because the pressure is above Pc. The high-T, high-P supercritical steam is then expanded to a low pressure through an adiabatic turbine. The steam entering the turbine is at the following conditions: T = 1200 degree F, P = 5000 psia. The outlet pressure of the turbine is 10 psia. (This is maintained by controlling the flow rate of cooling water to the condenser). if the turbine were both reversible and adiabatic, how much condensation would occur? (i.e. express the quality of the steam exiting the turbine as %-age liquid and %-age vapor) What would be the maximum power output of the reversible/adiabatic turbine, in Btu/lbm? If the mechanical efficiency of the turbine is expected to be 90%, what steam circulation rate (in lbm/hr) is required to produce 108 Btu/hr of power? If the mechanical efficiency of the turbine is 90%, how much condensation will occur? ? (i.e. express the quality of the steam exiting the turbine as %-age liquid and %-age vapor) Suggest a method for preventing condensation within the turbine. (This is an essay question. The reasoning behind the answer is the important concept. Be sure to explain your answer well.)Explanation / Answer
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