US 4,930,571 AGranted

Heat recovery apparatus

AssigneeIndustrial Energy Corporation

InventorJames B. Paull

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Abstract

A heat recovery system for at least partially cooling and at least partially cleaning an exhaust stream of hot air from a heating operation which is contaminated with vaporized, condensable liquids and with finely divided particulate solids comprising (a) a first indirect heat exchange means for partially cooling the hot exhaust stream with a fresh stream of cold air to a temperature not significantly above the dew point of vaporized liquids entrained in the hot air stream and for partially heating the fresh stream of air, (b) solids collecting means for centrifugally separating a substantial portion of the finely divided solids from the partially cooled exhaust stream and (c) second indirect heat exchange means for further cooling the exhaust stream to a temperature below the dew point of vaporized liquids initially contained therein to thereby liquefy a significant portion of the vaporized liquids and to further heat the stream of fresh air.

Claims3

Dependent claims

A heat recovery system for cleaning and cooling an exhaust stream of hot air contaminated with vaporized, condensible liquids and finely divided particulate solids emanating from a heating operation and flowing through a lateral elongate duct which comprises:

a. an elongate frame mounted laterally and transversely of said elongate duct;
b. first indirect heat exchange means comprising first lateral heat exchange tubes carried by said frame and interconnected with said duct for inducting lateral flow of said exhaust hot air stream through said first tubes;
c. second indirect heat exchange means carried by said frame comprising second lateral heat exchange tubes mounted in parallelism with said first tubes and interconnected with said duct for laterally returning said inducted hot air stream to said duct;
d. chambered solids collecting means laterally interconnected with said first and second tubes for laterally receiving said hot air stream from said first tubes, laterally reversing the direction of flow of said hot air stream and laterally delivering said hot air stream to said second tubes, and for laterally centrifugally separating finely divided solids in said hot air stream therefrom;
e. air fan means for laterally cross-flowing fresh air through said frame and across the outsides of said first and second heat exchange means at a predetermined flow set to partially cool said hot air stream flowing through said first tubes to a temperature not lower than a temperature within 5.degree. F. above the dew point of said vaporized liquids in said hot air stream and for partially heating said fresh stream of air and for further cooling said hot air stream in said second tubes to a temperature below the dew point of said vaporized liquids to thereby liquefy a significant portion thereof and for further heating said fresh stream of air;
and
f. means for delivering said thus-heated fresh air to a desired heating operation.

4 more elements

In a heating operation wherein an exhaust stream of hot air contaminated with vaporized liquids and finely divided solid particles is removed from the heating operation through an elongate lateral exhaust duct, the improved recovery device for removing vaporized liquids and solid particles from said exhaust stream and for recovering at least a portion of the heat contained therein comprising:

(a) a pair of end plates and a plurality of elongate lateral heat exchange tubes mounted thereinbetween to thereby provide a tube bundle consisting of lateral inlet tubes and lateral outlet tubes;
(b) a frame secured to and surrounding said tube bundle, said frame having an inlet opening in one side thereof and a discharge opening at the other side thereof defining an air space for the flow of fresh air across said heat exchange tubes, said frame being laterally mounted adjacent said exhaust duct and disposed so that said heat exchange tubes are transversely laterally aligned with respect to the longitudinal axis of flow of hot air through said exhaust duct;
(c) a transfer chamber laterally mounted to the duct end of said frame, said transfer chamber having a partition to separate said inlet tubes from said outlet tubes;
(d) a lateral inlet branch duct interconnecting the inlet side of said transfer chamber with said exhaust duct;
(e) a lateral outlet branch duct interconnecting the outlet side of said transfer chamber with said exhaust duct;
(f) means in said exhaust duct for diverting the flow of said hot air to said inlet duct;
(g) a collection chamber laterally mounted to the obverse end of said frame to permit air to centrifugally laterally flow from said inlet tubes to said outlet tubes;
(h) fan means for drawing fresh cold air laterally through said inlet opening of said frame, across said tube bundles and through said outlet opening in said frame at a predetermined flow rate set to cool said hot air in said exhaust stream as it flows through said inlet tubes to a temperature not lower than a temperature within 5.degree. F. above the dew point of vaporized liquids entrained therein, whereby finely divided solids entrained in said exhaust air will be laterally selectively centrifugally separated therefrom in said collection chamber and to further cool said vaporized liquids below the dew point thereof for liquefication and collection as said hot air flows laterally through said outlet tubes.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/912,992Filed 29 Sep 1986 · continuation in part
Priority: 8 May 1985
Granted: 5 Jun 1990
Term ends: Not estimatedThe source records don’t support an estimate.

Classification20 codes

F28D 7/1661
The conduit assemblies having a square or rectangular shape: with particular pattern of flow of the heat exchange media, e.g. change of flow direction
F24F 12/001
Use of energy recovery systems in air conditioning, ventilation or screening: with heat-exchange between supplied and exhausted air
F26B 23/002
Using waste heat: recovered from dryer exhaust gases
F26B 25/005
Details of general application not covered by group F26B21/00 or F26B23/00: treatment of dryer exhaust gases