improve the efficiency of power plant by some

7/28/2019 Improve the Efficiency of Power Plant by Some

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Improve the efficiency of power plantby some changes in rankine cycle

Submitted By:

Ajay Chobey

Gaurav Kumar

Pavan Kumar

Narendra Kumar

Santosh Rai

Presentation on

Submitted to:

PROF. MADHUMALATI ADHIKARI

Profession English (HS-501)


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Introduction

The Rankine cycle is an idealized

thermodynamic cycle of a heat engine that

converts heat into mechanical work.

Also called power plant cycle

It is named after William John Rankine, a

Scottish professor of mathematics at Glasgow

University .
http://en.wikipedia.org/wiki/Thermodynamic_cyclehttp://en.wikipedia.org/wiki/Heat_enginehttp://en.wikipedia.org/wiki/William_John_Macquorn_Rankinehttp://en.wikipedia.org/wiki/Glasgow_Universityhttp://en.wikipedia.org/wiki/Glasgow_Universityhttp://en.wikipedia.org/wiki/Glasgow_Universityhttp://en.wikipedia.org/wiki/Glasgow_Universityhttp://en.wikipedia.org/wiki/William_John_Macquorn_Rankinehttp://en.wikipedia.org/wiki/Heat_enginehttp://en.wikipedia.org/wiki/Thermodynamic_cycle


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Hypothesis

This cycle follows the idea of the Carnot cycle but

It can be practically implemented still has lowefficiency. If we directly use this cycle into the

power plant for generation power then this willproduce the less amount of mechanical work. sohere we will modify this cycle by using following

methods and assuming that this will increase the

efficiency1. Reheat

2. Regeneration


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Methodology

Reheat-split a single turbine stage into twoturbine stage for using the wet steam at exit

of a single turbine stage to generate the work


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Regeneration

in ideal rankine cycle when the workingsubstance comes from the pump it enters theboiler. But until a certain point temperature

stays low. this diminishes efficiency. Toovercome this drawback following step maytake

We can bleed the flow from turbine and heat

it before reentering boiler. This process iscalled as regeneration


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Regeneration

Preheats steam entering boiler using a feedwater heater, improving efficiency.


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AnalysisIdeal Rankine Cycle

This cycle consists four processes1-2 isentropic pump 2-3 constant pressure heat addition

3-4 isentropic turbine 4-1 constant pressure heat rejection


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Efficiency of Simple Rankine Cycle:

As we know, efficiency is the ratio between output and

input. Here the output is work done and input is heatenergy.

Net work done = work done in turbine + work done inpump

Net heat transfer = heat produced in boiler + heatrejected in condenser


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Reheat rankine cycle


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Regenerative rankine cycle

3412

7665

17

45

1

1

1

hhhhyW

hhyhhW

hhyQ

hhsQ

pump

turbine

out

Define yas fraction of mass extraction:

total

extraction

m

my


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Result

After the mathematical analysis of the cyclewe found that the efficiency of the cycle isincreased i.e. we are getting more mechanical

work from the previous one


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References

Figures from Cengel and Boles,

Thermodynamics, An Engineering Approach,6th ed., McGraw Hill, 2008.

Basic thermodynamics by P K Nag. 3rdedition.2006


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improve the efficiency of power plant by some

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