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For the first
time
in India, DESEIN
designed and
constructed
single
pass tower
type design
boiler to produce
690 tonnes per
hour of steam at
a temperature of
540 Deg C and a
pressure
of 156
ata.
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Desein
as the engineering & project consultant to Vijayawada
Thermal Power Station Units 3,4,5 & 6, each of 210MW capacity,
was involved in the execution of this prestigious project.
Many new engineering concepts were introduced by Desein,
for the first time in the power station.
Now, with the
success of Vijayawada Thermal Power Station (over 90%
PLF),
these concepts are being adopted in various other power
stations. |
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STEAM GENERATORS & AUXILIARIES
The drum type boiler is equipped with horizontal
drainable heating surfaces. The entire boiler including
the platforms at various levels are suspended from the
steel ceiling girders. A passenger lift and freight lift
is provided in the pylons for access to various platform
levels. PYLONS are supported on well foundations sunk
and anchored to hard work.
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DIRECT IGNITION PULVERIZED
COAL BURNERS (DIPC)
The source of substantial expenditure
in thermal power stations is found to be the use of oil
during Boiler light-up. |
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Use of DIPC burners helps instant start-up of boiler using
pulverized coal; and these burners are ignited by spark
ignition. Dependence on oil for start-up, stabilization
and loading is eliminated resulting in drastic reduction
in the use of supporting fuel oil.
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STEAM TURBINES AND GENERATORS
WITH AUXILIARIES
Brushless excitation with rotating diodes
is provided eliminating the problems associated with sliprings
due to vibration, wear of brushes etc. as is the case
with the conventional static excitation.
Single pass CONDENSERS
are installed with cupro-nickel tubes.
HIGH PRESSURE AND
LOW PRESSURE HEATERS in the regenerative cycle are provided
with horizontal U-tube construction for effective drainage.
A highly sophisticated Electronic System is provided for
Automatic Turbine Run-up System (ATRS). This is integrated
with Turbine Stress Evaluator to compute stress margins
for permitting a safe loading of the Turbine.
INSTRUMENTATION
AND CONTROLS are based on the highly sophisticated DIGITAL
DISTRIBUTED CONTROL SYSTEM (DDC) with computers,
etc.
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DIGITAL
DISTRIBUTED CONTROL
SYSTEM
DESEIN has built-up since the last several years
rich experience in engineering of DISTRIBUTED
CONTROL SYSTEMS (DDC) FOR POWER STATION
APPLICATIONS. |
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It has also engineered a number of Microprocessor
based Programmable Logic Controllers (PLC) for
Plant Interlocks and Sequential Controls for Control
of Auxiliary Plants such as coal handling plant,
ash handling plant etc. |
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