Coolers and heat recovery
In mineral processing plant, the temperatures of discharged products from thermal
processing are high. In order to lower that temperature, or to recover some
heat, or both, coolers are
used. Most of
the coolers are inversely working dryers, however, with a higher capacity per
installed unit.
Normally there
are three basic designs:
• Air Swept Coolers built similar as a counter flow direct heat
rotary dryer, where hot gasses are replaced with ambient air
• Water cooled shell coolers where the drum shell is cooled with water or
is submerged in a pool of water.
• Water tube coolers having the same design as a steam tube dryer,
where the steam is replaced with cool water
Coolers of fluid bed type
The principles
of fluid bed can be used also for cooling purposes. In this case the
fluid bed is
cooled by internal water pipes.
Ash Cooling
Circulating
Fluidized Bed Boiler
Coolers and heat recovery
Thermal
processing is a question of limiting the energy input for each part of the operation.
This is the strongest argument (together with environmental issues) in a competitive
situation for systems selection. The system with the best heat balance has
probably also the best heat recovery system utilizing the energy released from
cooling.
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