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

Calculate the spindle speed in milling operation, Calculate the Spindle Spe...

Calculate the Spindle Speed in Milling Operation Calculate the spindle speed (N) if a copper job is to be milled by  (a) stellite cutter  (b) cemented carbide cutter.

Determine the maximum stress developed in the beam, Determine the maximum s...

Determine the maximum stress developed in the beam: An I section in Figure is utilized as a beam. The beam is subjected to a bending moment of 2.5 kN m at its neutral axis. De

Sizing a Motor that has a cable Pulley, I am stumped as to how to figure th...

I am stumped as to how to figure this out. It is a motor with a cable pulley to move the carriage in a wave tank. (the part that pulls the boat, etc). I have to build it on paper

Select a flat belt drive, It is essential to select a flat belt drive for a...

It is essential to select a flat belt drive for a compressor running at 720 r.p.m which is driven by a 25kW, 1440 r.p.m. motor. Space is available for a distance of 3m. The belt is

Ignition, how does catalytic ignition operate

how does catalytic ignition operate

Find out the intensity of the external pressure, Find out the intensity of ...

Find out the intensity of the external pressure: A thick cylinder of 0.5 m external diameter & 0.4 m internal diameter is subjected simultaneously to internal & external press

Necessity of transmission system , Necessity of Transmission System ...

Necessity of Transmission System The main purpose of Transmission system is to provide a means to vary the torque ratio between the engine and the road wheels. It means th

Systematic layout planning, What are the primary benefits of using computer...

What are the primary benefits of using computerized layout procedures vs. Systematic Layout Planning (SLP) procedures done by hand?

Contrary to the misconception, Contrary to the misconception that the grow...

Contrary to the misconception that the growth in automobile industry has catered only to the higher income-stratum of society by producing mostly passenger cars, the fastest growt

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