The invention provides a heat
recovery device of an
air preheater, relates to the field of heat
recovery of air preheaters, and aims to solve the problems of
flue gas heat loss and insufficient heat
recovery in the prior art. The device comprises an
air preheater body, a
flue gas filter, a fan, a preheating outer frame body, a heat preservation shell plate and the like. The
air preheater body is provided with an air inlet
pipe opening, an air outlet
pipe opening and a heat exchange cavity, and a two-stage filter screen plate of the
flue gas filter ensures that the
flue gas is clean. The fan drives the spiral blades to make
smoke flow spirally, and the circulation path is increased. A spiral liquid guide channel of the preheating outer frame body is communicated with a heat exchange pipeline, and heat exchange between water and
smoke and heat exchange between the water and the
smoke and the outer shell body are achieved through a
booster pump. The heat preservation shell plate reduces heat loss. All the components work cooperatively, heat loss of the shell is effectively reduced, heat recovery efficiency is improved, and the
heat exchanger is suitable for the fields of industrial boilers and the like and has remarkable energy-saving and environment-friendly significance.