1. A steam turbine system has a boiler pressure of 40 bar and the emergentsteam is superheated to 500°C. The condenser pressure is 0.04 bar. If theexpansion and compression stages have ideal efficiency,(i)What is the thermal efficiency, dryness fraction and specific steam consumption ofthe cycle considered, If the cycle is having one reheat stage to the superheattemperature?What is the thermal efficiency, dryness fraction and specific steam consumption ofthe cycle considered, if the cycle is having one bleed point (open heater) at thepressure where the steam become saturated after first expansion?(ii)

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Answered: 1. A steam turbine system has a boiler…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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Question 4 a. A factory requires electrical power for its machinery along with 80 MW of heat for process heating. The combined demand is achieved by using a superheated Rankine steam cycle in which the turbine is used to supply the electrical power required and the condenser cooling water provides the process heating to the factory. Steam is generated in a boiler at a pressure of 70 bar and it leaves the superheater at a temperature of 400°C. The steam expands through the turbine to a condenser pressure of 3 bar. The turbine isentropic efficiency is 0.85. The steam is condensed to saturated liquid in the condenser and a feed pump increases the condensate pressure to 70 bar for return to the boiler. The feed pump work may be neglected in the calculation. i. Sketch the cycle in a T-s diagram. ii. Calculate the steam mass flow rate required to satisfy the process heating demand. iii. Calculate the power available from the turbine. iv. Determine the thermal efficiency of the cycle.
My Question: In the steam plant problem#2, the reheater developed a leak and it was decided to run the plant bypassing the reheater. Determine the thermal efficiency and steam flow rate to develop the same power output.Problem 2 (In a reheat cycle steam enters the high-pressure turbine at 40 bar and 400C. It expands isentropically to 6 bar and is reheated at constant pressure to 400C. This steam is expanded isentropically in the low pressure turbine to the condenser pressure of 0.1 bar. Calculate the thermal efficiency and steam consumption for 10 MW output.)
1. A reheat steam cycle has 13,580 kPa of throttle pressure at the turbine inlet and a 37.50308414 atm reheat pressure, the throttle and reheat temperature of the steam is 1302 R, condenser pressure is 4.3 kPa. Determine the difference between the simple Rankine cycle efficiency and the reheat Rankine cycle efficiency, in percent.
A steam power plant is operating on the ideal Rankine cycle. The boiler is maintained at 4 MPa, and the condenser at 40 kPa. The steam quality leaving the turbine is at 90%. a.) Draw the proper T-S diagram of the cycle with proper label for the points. b.) Find the temperature of the steam entering the turbine, Qa, Qr, Wt, Wp, Wnet, efficiency, and steam rate
Draw a schematic diagram of this problem.
Rankine Cycle (Thermodynamics) Show the illustration diagram and complete and step by step solution.
In a reheat cycle steam at 15 MPa, 540°C enters the engine and expands to 1.95 MPa. At this point the steam is withdrawn and passed through a reheater. It reenters the engine at 540°C. Expansion now occurs to the condenser pressure of 0.0035 MPa. (a) For the ideal cycle, find e. (b) A 60,000 kw turbine operates between the same state points except that the steam enters the reheater at 1.95 MPa and 260°C, departs at 1.8 MPa and 540°C. The steam flow is 147,000 kg/hr, generator efficiency is 96%. For actual engine, finde, m,, and m, (c) Determine the approximate enthalpy of the exhaust steam if the heat lost through the turbine casing is 2% of the combined work. Ans.: (a) 46.1%, (b) 37.3%, 2.45 kg/kwh, 79.3%, (c) 2489.6 kJ/kg
A binary-vapour cycle operates on mercury and steam. Saturated mercury vapour at 4.5 bar is suppliedto the mercury turbine, from which it exhaust at 0.04 bar. The mercury condenser generates saturatedsteam at 15 bar which is expanded in a steam turbine to 0.04 bar.(i) Find the overall efficiency of the cycle.(ii) If 50000 kg/h of steam flows through the steam turbine, what is the flow through the mercuryturbine ?(iii) Assuming that all processes are reversible, what is the useful work done in the binary vapour cyclefor the specified steam flow ?(iv) If the steam leaving the mercury condenser is superheated to a temperature of 300°C in a superheaterlocated in the mercury boiler, and if the internal efficiencies of the mercury and steam turbinesare 0.85 and 0.87 respectively, calculate the overall efficiency of the cycle. The properties ofsaturatedmercury are given below :
A set of data for a steam power plant operates with a Rankine cycle is obtained as the following: Boiler pressure Steam temperature 11 MPa 430°C High pressure turbine exhaust pressure Reheat temperature 1.5 MPa 400°C Condenser pressure 0.007 MPa Isentropic efficiency of high pressure turbine 85% Isentropic efficiency of low pressure turbine 87% a. Sketch and label the process cycle on the T- s diagram. b. Assume the work done on the boiler feed-water pump is not neglected, determine the following: i. Total heat supplied. ii. Total work output from both turbines. iii. Thermal efficiency. iv. Specific steam consumption.

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