Thermal power plant by sarvesh
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Transcript of Thermal power plant by sarvesh
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NAME: SARVESH KUMAR
CLASS: X DIV : A:SCHOOL:LIPS
THERMAL POWER PLANT
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CONTENTS
INTRODUCTION OF POWER PLANT OBJECTIVE OF INSTRUMENTATION & CONTROL CLASSIFICATION OF POWER PLANTS THERMAL POWER PLANT SUB CYCLES OF THERMAL POWER PLANT QUANTITIES TO BE MEASURED MEASUREMENT POINT & VARIABLES MEASUREMENT PROCESS REFERENCES
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INTRODUCTION
Power plant is assembly of systems or sub-systems to generate electricity.
Power plant must be useful economically & environmental friendly to the society.
Design of power plant incorporate two important aspects:
(1)Selection of power generating equipments should be such so that maximum of return will result from minimum expenditure over the working life of the plant.
(2)Operation should be such so as to provide cheap, reliable & continuous service.
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This entire task is often taken up by control & instrumentation or simply instrumentation system which has following functions:
a) Measurementb) Controlc) Operationd) Monitoringe) Protection
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For a plant Measurement system needs to be: Very accurate Reliable Delays should be as small as possible Should be switched on manually when
a overall control system fails
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Objective OF Instrumentation &
Control Efficient Operation of the plant Economic Operation of the plant Safe operation of the plant Pollution control
GURUNANAK THERMAL POWER PLANT, BATHINDA(PUNJAB)
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Classification Of Power Plants
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Thermal Power Plant
A Generating station which convert heat energy into electrical energy
The Steam Power Plant, Diesel Power Plant, Gas Turbine Power Plant& Nuclear Power Plant are called THERMAL POWER PLANT. Works on RANKINE
Cycle.
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Coal Mines In India
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Operation
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Layout OF Steam Power Plant
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Sub Cycles Of Thermal Power Plant
WATER CYCLE -------- CONDENSATION, FEEDPUMP, ECONOMIZER
COMBUSTION CYCLE ---------- ECONOMIZER, BOILER, SUPER HEATER
STEAM CYCLE ------------------ BOILER, SUPER HEATER, TURBINE
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Quantities To Be Measured
Pressure Temperature Flow Level Expansion/ Contraction Analysis of (1) Water (2) Steam (3) Flue
Gases And Others
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Measurement Points & Variables
Variables/ Measuring Points Types Of Sensors/ Approx. number Parameters Instruments in the plant
(1) Pressure (a) Boiler Bourdon Tube, (b) Turbine Diaphragm, (c) Turbine Throttle Bellows 375-
400 (d) Furnace Bell Gauges
(2) Tempera (a Steam at superheater Thermocouple ture inlet & outlet (b Feed Water at economiser inlet (c Water at condenser RTD 700-750 inlet (d Air Preheater (e Flue Gases Thermocouple
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Measurement Of Pressure
Varies from vacuum as in furnace to 200 Mpa at the main steamline.
Pressure measuring devices are divided into two groups: (1) Liquid Columns (2) Expansion Elements
Liquid columns: Manometric type instruments Low range pressure measurement P =0
h Patm
WELL TYPE MANOMETER
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Measurement Of Pressure
These are not favoured in modern power plant but are still used in older power plants.
Expansion elements: Used in modern power plants Usually metallic & its movement indicates
the pressure Either directly coupled with mechanical
linkages or indirectly by an electrical transducer
connected to a read out device
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Measurement Of Pressure
Expansion elements
Diaphragms Bellows Bourdon tube Diaphragms: Commonly corrugated diaphragms are used
because large deflection can be produced without nonlinearity compared with flat type.
In order to increase the deflection capabilities two or more corrugated diaphragms are welded at the circumferences--- Capsule element.
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Measurement Of Pressure
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Measurement Of Pressure
Bellows
Manufactured from Brass, Brass alloys,
Stainless steel.
Used for low pressure
measurement.
For high pressure measurement bellows are
connected with spring.
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Measurement Of Pressure
Bourdon TubeC shaped & made into an arc
of about 2700
Material from which it made depends upon the pressure
range of the device
Bourdon tubes are also used in forms other than C type Spiral element: large movement than C tube.
Helical element: produce more or less circular
movement which is useful for driving a recorder pen
directly.
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Measurement Of Temperature
Since power generation is a Thermodynamic process so up to date knowledge of temperature of the plant is most important.
The efficiency of generation also depend on the temperature measurement
T2 = Temp. inside the condenserT1= Superheater temperature Temp. can be measured only by using indirect
methods.
121TT
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Measurement Of Temperature
THERMOELECTRIC THERMOMETRY The actual value depend upon the
material used & on temperature difference between the junctions.
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Measurement Of Temperature
TYPE METAL A METAL B TEMPERATURE RANGE
POINT TO KNOW
T COPPER COPPER- NICKEL (CONSTANTAN)
4000C RESISTANT TO CORROSION IN MOST ATMOSPHERE
J IRON COPPER- NICKEL (CONSTANTAN)
8500C NOT COMMONLY USED BECAUSE OF RUSTING & EMBRITTLEMENT
E NICKEL-CHROMIUM(CHROME)
COPPER- NICKEL (CONSTANTAN)
7000C SUITABLE FOR OXIDISING & INERT ATMOSPHERE
K NICKEL-CHROMIUM(CHROME)
NICKEL- ALUMINIUM (ALUMEL)
11000C MOST COMMONLY USED
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Measurement Of Temperature
TYPE METAL A METAL B TEMPERATURE RANGE
POINT TO KNOW
R PLATINUM13%RHODIUM
PLATINUM 14000C SUITABLE FOR OXIDISING & INERT ATMOSPHERE
S PLATINUM10%RHODIUM
PLATINUM 14000C SUITABLE FOR OXIDISING & INERT ATMOSPHERE, CAN BE USED IN VACUUM FOR SHORT PERIOD
THERMISTOR ARE NOT USED IN THERMAL POWER PLANTS BECAUSE ITS RANGE IS -600 TO 150
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Measurement Of Temperature
RESISTANCE THERMOMETRY Suggested by Siemens in 1871- but not
satisfactory used for high temperature Today RTD is given by H.L.Calender in 1891 PROPERTY-The resistance of the conductor
changes when its temperature is changed. Copper is occasionally used Platinum, nickel or nickel alloys are commonly
used Tungsten is used for high temperature
applications
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Measurement Of Temperature
METAL MIN. TEMP. MAX.TEMP. MELTING POINT
PLATINUM -2600C 1100C 17730CCOPPER 00C 1800C 10830CNICKEL -2200C 3000C 14350CTUNGSTEN -2000C 10000C 33700C
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Measurement Of Flow
A universal flow meter for all applications in power station is not available.
Infact there are more ways of measuring flow than measuring pressure & temperature.
Dual function meters usually measure flow rate with linear output & minimum error.
Vortex & Ultrasonic meters have become available in recent years (1986) & their full potential is not still fully developed.
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Measurement Of Flow
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Analysis pH, DO,TURBIDITY & HYDRAZINE: Need to be checked for acidity (pH),
Dissolved oxygen(DO) Turbidity arising out of contamination
by suspended particles . Hydrazine which is added from outside
to the feed water but the excess should be monitored.
Oxygen reacts with thallium to form thallium oxide which in aqueous solution show good conductivity.
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ANALYSIS
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Analysis
Turbidity is measured at the outlet of the condenser.
Hydrazine is added to decrease dissolved oxygen
Hydrazine nitrogen + water Its also makes water alkaline & prevent
acidic corrosion. Its is also toxic so its overuse can effect
the aquatic life.
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References
British Electricity International,Modern Power station practice, control & instrumentation, vol F.
A.K. Sawhney, “A course in Electrical & Electronic measurements & instrumentation”, Danpat Rai & CO.,seventeenth edition.
D Patranabis, “Principles of Industrial Instrumentation”,TMH, second edition.
Frederick T. Morse, “ Power Plant Engineering”. “Power Plant Engineering”,
http://en.wikipedia.org/wiki/power plant engineering A.K. Raja, “Power plant Engineering”,New Age
International Publishers.
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References
Educational Technology Service Centre- IIT KHARAGPUR; S. BANERJEE; EE Deptt., Energy resource & technology.
V.K. Mehta, “Principles Of Power System”, S Chand.
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