Velox boiler Principal of bolier Construction of bolier Working of bolier

1. POWERPLANT ENGINEERING
(2171910)
Prepared By : Sajan Gohel (160123119010)
Branch: - Mechanical
Batch: - 7D1
Guided by: Prof.:- Nirav Joshi
Gandhinagar Institute of Technology
VELOX BOILER

2. PRINCIPLE OF VELOX BOILER
• When the velocity of the gas is greater than the speed of
sound, its heat transfer rate is also increases. So more heat is
transfer from gas to water as compare when the heat transfer
at the subsonic speed. This is the basic principle of of it. This
boiler can increase the heat transfer rate or can say steam
generation rate without increasing boiler size. This is why;
Velox boiler is most successful boiler in the gas turbine
industries.
P.P.E (2171910)
VELOX BOILER
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3. CONSTRUCTION OF VELOX BOILER
Feed pump
Economiser
Gas turbine
Axial compressor
Tube
evaporating
section
Water
circulation
pump
Steam
seperator
P.P.E (2171910)
VELOX BOILER
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4. Working of velox boiler
• The Velox boiler works as a basic heat exchanger. The working of this boiler is
as follow.
• The air is compressed by air compressor driven by gas a turbine driven. This
compressed air passes from the combustion chamber, where more heat
release by the fuel which increase the velocity of the flue gases up to sound
velocity. From the bottom of combustion chamber, this flue gases pass from
the fire tubes. These fire tubes surrounded by the evaporator water tubes.
• The water from the economizer passes from the evaporator tube force by a
circulating pump. This water passes 15 - 20 time from the evaporator tube at
very high speed. Due to this high speed circulation, heat is transfer from the
gases to the water at very high rate. The mixture of water and steam is
formed which further passes from the water and steam separator.
P.P.E (2171910)
VELOX BOILER
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5. • The steam from the steam separator passes to the super
heater and further for process work. The remaining water in
the steam separator again passes from the evaporator tube.
The flue gases from the fire tubes send to the super heater
tubes, where it increases the steam temperature. The gas from
the super heater sends to the turbine where it rotates the gas
turbine and then passes from the economizer.
• This is the working of Velox boiler.
P.P.E (2171910)
VELOX BOILER
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6. Thank you......!!!!
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