DRYCON™
Continuous
"Dry" Bottom Ash Removal Technology |
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In today's competitive power market industry,
operators must be economical in their
decisions to run plants efficiently at
minimal cost. In order to assist with this
strategy, Clyde Bergemann Delta Ducon
presents the DRYCON™ system which extracts
bottom ash from coal-fired boilers using a
dry mechanical solution. The more commonly
used ‘wet’ bottom ash systems can now be
safely replaced with DRYCON™ to ensure a
more cost effective system is installed that
is designed to increase efficiency and
comply with environmental protection
regulations. |
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The DRYCON™ Process
Air is induced into DRYCON™ at the top end
and along the length of the conveyor
by the negative pressure inside the boiler.
Air travels along the surface of the ash
which rests on the steel plate conveyor.
This air travels in counter flow direction
along the ash.
A re-burning process of the glowing ash is
activated. This reduces the unburned
carbon level and frees up additional thermal
energy.
Before entering the combustion chamber, the
air is heated and adds additional
thermal energy to the steam generating
process within the boiler.
The combustion process and exhaust gas
composition are not adversely affected
(no more additional air than approx. 1% of
the combustion air is added to the
boiler) |
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Below the upper level of the steel belt,
impact tables
are positioned to support the
belt in the event of
significantly large ash
pieces falling. |
Advantages of using DRYCON™
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Increased boiler efficiency
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Elimination of water
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Profitable bottom ash quality
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Increased ash capacity
- Simple
fines removal
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Enhanced ash cooling
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Handles large lumps
- High
resistance to temperature
- Easy
maintenance
- Low
Overall Height
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 The DRYCON™ Arrangement
Boiler Collection Hopper and Isolation Gates
- installed underneath the combustion
chamber and supported by a steel structure.
The hopper is lined with a special
refractory and insulation to withstand
radiation from the combustion chamber of the
boiler.
Compensator - A heat resistant fabric
compensator will typically be installed
between the boiler/hopper outlet and the DRYCON™ to compensate the movement between
the cold and hot condition of the boiler.
Steel Plate Conveyor - Direct drive provided
by two round link chains and a frequency
controlled drive station. The speed of the
conveyor can have step-less variation from
0,005 to 0,10 m/s. Optimal conveyor speed is
provided by a torque-dependant drive system
based on the accumulating ash on the
conveyor.
Drive Station - an electro mechanical or
hydraulic variable speed drive can be used.
Independent Spring-Loaded or Automatic
Hydraulic Tensioning Station - maintains the
tension of each chain (provided with a limit
switch and a scale for in-service monitoring
of tension adjustment). Sensors for remote
control of tension and temperature can also
be added.
Rail System - DRYCON™ can be built on a
rail system which allows it to be
repositioned to the side when the boiler is
out of operation. This allows free access to
the boiler combustion chamber for
maintenance and repairs.
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