REQUIREMENT of Air Preheater REQUIREMENT of Air Preheater | Page 3

g) the exchange of punctured tubes is a major task, which requires more downtime
at the boiler.
With the number of disadvantages, the use of recuperative air heaters in large-
capacity boilers is unpopular. In certain boilers, however, the pipe air heater is used to heat
the primary air separately to avoid transfer of fly ash for pulverization.
Regenerative Air-Heater
In this category, there are two types of air heaters. One of the Ljungstrom-type
rotary heater matrix and the other Davidson-type with stationary heating elements. The
Ljungstrorm-air heaters are mainly used in Indian power
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