Q1: A steam turbine gets its supply of steam at 70bar and 450 °C after expanding to 25bar in high pressure stages, it is reheated to 420 °C at the constant pressure. Next it is expanded in intermediate pressure stage to an appropriate minimum pressure such that part of the steam bled at this pressure heats the open feed water to a temperature of 180 °C .The remaining steam expands from this pressure to a condenser pressure of 0.07 bar in the low pressure stage. The isentropic efficiency of the h.p. stage is 78.5%, while that of the intermediate and I.p. stage is 83% each .From the above data (a) determine the minimum pressure at which bleeding is necessary, and sketch a line diagram of the arrangement of the plant, (b)sketch on the T-S diagram all the processes (c) determine the quantity of steam bled per kg of flow at the turbine inlet, and (d)calculate the efficiency .Neglect pump work.
Q1: A steam turbine gets its supply of steam at 70bar and 450 °C after expanding to 25bar in high pressure stages, it is reheated to 420 °C at the constant pressure. Next it is expanded in intermediate pressure stage to an appropriate minimum pressure such that part of the steam bled at this pressure heats the open feed water to a temperature of 180 °C .The remaining steam expands from this pressure to a condenser pressure of 0.07 bar in the low pressure stage. The isentropic efficiency of the h.p. stage is 78.5%, while that of the intermediate and I.p. stage is 83% each .From the above data (a) determine the minimum pressure at which bleeding is necessary, and sketch a line diagram of the arrangement of the plant, (b)sketch on the T-S diagram all the processes (c) determine the quantity of steam bled per kg of flow at the turbine inlet, and (d)calculate the efficiency .Neglect pump work.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text:Q1: A steam turbine gets its supply of steam at 70bar and 450 °C after expanding to 25bar
in high pressure stages, it is reheated to 420 °C at the constant pressure. Next it is expanded
in intermediate pressure stage to an appropriate minimum pressure such that part of the
steam bled at this pressure heats the open feed water to a temperature of 180 °C.The
remaining steam expands from this pressure to a condenser pressure of 0.07 bar in the low
pressure stage.
The isentropic efficiency of the h.p. stage is 78.5%, while that of the intermediate and I.p.
stage is 83% each .From the above data (a) determine the minimum pressure at which
bleeding is necessary, and sketch a line diagram of the arrangement of the plant, (b)sketch
on the T-S diagram all the processes (c) determine the quantity of steam bled per kg of flow
at the turbine inlet, and (d)calculate the efficiency .Neglect pump work.
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