AIR PREHEATER HEAT TRANSFER SURFACE

摘要

An air preheater (10) has heat transfer elements (40) with a first series of corrugated elements (50) having longitudinally oriented, mutually parallel corrugations (51) formed generally continuously across the lateral direction. Positioned on either side of each of the corrugated elements (50) of the first series are a series of notched plates (52) each having mutually parallel spaced apart notches. Each notch (54) is formed by parallel double ridges (56) projecting transversely from opposite sides and the element (50) has flat sections (58) between the notches (54). The notches (54) are oriented obliquely in mutually opposite directions relative to the corrugations (51) of the adjacent elements (50) whereby the notched elements (52) are in contact with the corrugated elements (50) solely at the points of intersection of the notches (54) and corrugations (51). This produces an increased number of boundary layer breaks and improves heat transfer as well as providing straight line passages through the elements (50).