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 thermodynamics system, Explain Thermodynamics System In thermod...

Explain Thermodynamics System In thermodynamics the system is illustrated as the quantity of matter or region in space upon which the concentration is concentrated for the sake

Clearance volume, Clearance Volume ( V C ) : The nominal volume of the c...

Clearance Volume ( V C ) : The nominal volume of the combustion chamber above the piston when it is at the top dead centre is the clearance volume. It is designated as V C an

Define the advantages of abrasive jet cutting machines, Advantages of Abras...

Advantages of Abrasive Jet Cutting Machines 1. Ability to cut brittle or heat sensitive material without damage. 2. Capability to cut intricate holes in material of any hard

Klein construction, how to find acceleration by Klein construction

how to find acceleration by Klein construction

Basic blocks of a generalized measurement system, Can you explain the basic...

Can you explain the basic blocks of a generalized measurement system? Draw them and illustrate their functions.

Types of coated electrodes, TYPES OF COATED ELECTRODES Following are the ...

TYPES OF COATED ELECTRODES Following are the types of coated electrodes: a. Cellulosic electrodes b. Rutile electrodes c. Iron powder electrodes d. Low hydrogen e

Work done - thermodynamics, Work done - thermodynamics: A free expansi...

Work done - thermodynamics: A free expansion process is a process in which system expands freely without experience any resistance. I.E. is constant at the time of state chang

Angular speed of the cylinder, Angular speed of the cylinder: A cylind...

Angular speed of the cylinder: A cylinder of mass 70 kg rotates from rest in frictionless bearing under the action of a mass of 7.0 kg carried by a rope wrapped around the cyl

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