Recuperative heat exchanger having radiation absorbing turbulator
AssigneeThe Air Preheater Company, Inc.
InventorWayne S. Counterman
Life of this patent
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Abstract
A tubular recuperative heat exchanger (10) is adapted for transferring heat from a hot gas stream having a temperature of 1200 F. flowing over the outside surface of the heat exchange tubes (12) to a cold gas stream flowing therethrough. A turbulator (22) is disposed within each heat exchange tube (12) to improve convective heat exchange. The turbulator (22) is coated with a material having a higher absorptivity than that of the underlying surface of the turbulator. Further, the inside surface (24) of the heat exchange tubes (12) may be coated with a material having a higher emissivity than that of the underlying inside surface of the heat exchange tubes.
Claims6
A recuperative heat exchanger for use in transferring heat from a hot gas stream having a temperature of about 1200.degree. F. and higher to a cold stream, comprising:
- a. a housing defining a flow conduit therethrough, said housing having an inlet and an outlet for directing the hot gas stream through said flow conduit;
- b. a plurality of heat exchange tubes extending through said housing transversely to the flow of hot gas through said flow conduit for directing the cold gas stream therethrough in indirect heat exchange relationship with the hot gas stream flowing over said heat exchange tubes, and
- c. turbulator means disposed within said heat exchange tubes for preventing laminar flow in the cold gas stream passing through said heat exchange tubes, said turbulator means being coated with a radiation absorbing material having an absorptivity greater than the absorptivity of the underlying surface of said turbulator means whereby said turbulator means is made a better radiation receiver.
Dependencies are inferred from the claim text.