02.boiler fundamentals
TRANSCRIPT
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04/07/23 S.VISWANATHAN 1
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04/07/23 S.VISWANATHAN 2
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04/07/23 S.VISWANATHAN 3
STEAM GENRATION
• CONVERSION WATER INTO STEAM
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04/07/23 S.VISWANATHAN 4
BOILING PROCESS
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04/07/23 S.VISWANATHAN 5
BOILING PROCESS OF WATER
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04/07/23 S.VISWANATHAN 6
HEAT TRANSFER IN BOILER
• RADIATION
• CONVECTION
• CONDUCTION
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04/07/23 S.VISWANATHAN 7
HEAT TRANSFER IN BOILER
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04/07/23 S.VISWANATHAN 8
HEAT TRANSFER IN BOILER
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04/07/23 S.VISWANATHAN 9
HEAT TRANSFER IN BOILER
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04/07/23 S.VISWANATHAN 10
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04/07/23 S.VISWANATHAN 11
PressureKg/cm2
Sat.Temp.0C
Sp.EnthalpyKcal/Kg
Sp.Volumem3/Kg
At sattemp.
At S.H.Temp.5400C
At sattemp.
At S.H.Temp.5400C
1 99 638 854 1.725 3.824
10 179 663 852 0.198 0.3802
50 263 667 842 0.04 0.074
100 310 652 828 0.0184 0.032
150 341 626 817 0.0106 0.023
224 374 520 797 0.0037 0.015
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04/07/23 S.VISWANATHAN 12
INCREASING STEAM PARAMETERS
STEAM GENERATION AT
ATMOSPHERC PRESSURE
INCREASING PRESSURE
INCREASING TEMPERATURE
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04/07/23 S.VISWANATHAN 13
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04/07/23 S.VISWANATHAN 14
BOILER-CIRCULATION
• SUFFICIENT FLOW / CIRCULATION OF FLUID IS REQUIRED THROUGH THE BOILER TUBES TO KEEP THE INNER SURFACE CONTINUOUSLY WETTED / COOLED
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04/07/23 S.VISWANATHAN 15
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04/07/23 S.VISWANATHAN 16
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04/07/23 S.VISWANATHAN 17
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04/07/23 S.VISWANATHAN 18
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04/07/23 S.VISWANATHAN 19
CIRCULATION NUMBER
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04/07/23 S.VISWANATHAN 20
EFFECTS OF CIRCULATION NUMBER
• HIGH– CHANCES OF SCALE FORMATION
LESS– LESS POSSIBLITY OF DNB– NEEDS LARGER EVAPORATOR
• LOW– EVAPORATOR COMPACT– CHANCES OF SCALE FORMATION
MORE– OCCURANCE OF DNB
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04/07/23 S.VISWANATHAN 21
CIRCULATION NUMBER FOR DIFFERENT BOILERS• NATURAL CIRCULATION – INDUSTRIAL BOILERS 12 TO 15– UTILITY BOILERS 7 TO 9
• ASSISTED CIRCULATION 2 TO 3
• FORCED CIRCULATION/
ONCE THROUGH 1
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04/07/23 S.VISWANATHAN 22
CONTROLLED CIRCULATION
• ORIFICES ARE INSTALLED BETWEEN BOTTOM HEADER AND WATER WALL TUBES TO REGULATE FLOW OF WATER INTO A TUBE BASED ON THE HEAT RECEIVED BY IT / ITS RELATIVE POSITION IN THE FURNACE.
• MINIMISE OCCURANCE OF DNB
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04/07/23 S.VISWANATHAN 23
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04/07/23 S.VISWANATHAN 24