Steam turbines, Mechanical Engineering

Assignment Help:

The steam that leaves the super-heater is expanded from 130bar at 535°C to 25.2bar at 310°C in a high pressure turbine. The steam from the exit of the HP turbine is reheated to 535°C in the boiler. The reheated steam is then expanded to 8.5bar at 378°C in the intermediate pressure turbine, after which a certain percentage of the steam is bled off to a feedwater heater. The remaining steam is then expanded through a low pressure turbine to 0.05 bar and a dryness fraction of 0.94. All 'steam' entering the feed pumps shall be a saturated fluid.  Produce a schematic diagram of the system, together with an appropriate T-s diagram. Using steam tables only, calculate

  1. The isentropic efficiencies of  the three turbines;
  2. The cycle efficiencies; 
  3. The percentage of steam bled off to the feedwater heater;
  4. The power generated by the turbines per unit mass of steam leaving the boiler;
  5. If the turbines generate 200MW power, how much cooling water must be used per hour, assuming that water can be returned to the river at only 10°C above its extraction temperature? (Assume that the specific heat capacity of water is 4.18 kJ/(kg·K));
  6. If a high pressure surface-type feedwater heater is placed between the boiler and HP feedwater pump to raise the feedwater temperature, configure the cycle and analyse the impact on the cycle performance.

Related Discussions:- Steam turbines

Explain the semi universal drilling machine, Explain the semi universal dri...

Explain the semi universal drilling machine The semi universal drilling machine this machines, in addition to the above three basic movements, carry provision for swinging of

Compute the total force which shall be acting on the springs, Compute the t...

Compute the total force which shall be acting on the springs: An automobile of mass 1300 kg, travelling at a speed of 60 kmph hits a depression in the road that has a radius o

Governor, where expendable pattern is used?

where expendable pattern is used?

Load on beam, Load on beam: A beam AB as shown in the figure give...

Load on beam: A beam AB as shown in the figure given below is hinged at A and supported at B by a vertical cord that passes over two frictionless pulleys C and

Explain the importance of jigs and fixtures, Explain the Importance of jigs...

Explain the Importance of jigs and fixtures: Enhance productivity. Rapid production work. Reduces manufacturing costs. Complex and heavy components can be

Describe the basic concept of descriptive interface, Describe the basic con...

Describe the basic concept of descriptive interface Descriptive interfaces are the window to other CAD systems, to the master databases or to the manufacturing activities. The

Coil-fundamentals of electricity , Coil: A coil is used in ignition s...

Coil: A coil is used in ignition system to increase the voltage supplied by the battery or magneto. Coil

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd