What is Recuperative or Tubular Type?

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    Recuperative type of air preheaters is preferably used in small and medium size boilers. In this type heat energy exchange is carried out through the walls of heating surface that separate the heat energy carrier and air to be heated.

    Ambient air is forced by a fan through ducting at one end of the preheater tube and at other end the heated air from inside the tubes emerges into another set of ducting Tubular preheaters consist of straight tube bundles which pass through the outlet ducting of the boiler and open at each end outside of the ducting. The hot furnace gases pass around the preheater tubes inside the ducting which transfers that carries it to the furnace of a boiler for combustion.

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