F - Mech Eng,Light,Heat,Weapons – 22 – B
Patent
F - Mech Eng,Light,Heat,Weapons
22
B
257/29, 122/93
F22B 33/00 (2006.01)
Patent
CA 1248826
ABSTRACT A heat recovery apparatus for boilers, or the like, comprising a heat recovery housing generally having a pair of side walls, a pair of end walls connected to the side walls, a top and a bottom. A com- bustion gas inlet is disposed within the bottom, and a combustion gas outlet is positioned within the top. A plurality of interconnected water conduit tubes is provided with a cold water inlet in communica- tion with one of the end walls and a hot water exit also in communica- tion with one of the end walls. The water conduit tubes pass circuitous- ly through the heat recovery housing. A tube roof is interconnected between the pair of end walls above the water conduit tubes and above the cold water inlet and above the hot water exit. A plurality of by- pass dampers pivotally connect between the pair of end walls such that when the by-pass dampers are in a closed position the closed by- pass dampers define a generally flat by-pass structure angularly dis- posed with respect to the horizontal plane and extended between the pair of end walls and from one of the pair of side walls to the tube roof in order to divert or change the direction of flow of combustion gases from the combustion gas inlet towards the water conduit tubes. A condensate drain is positioned in the bottom of the recovery housing and underneath the water conduit tubes. A plurality of exit dampers is pivotally connected between the pair of end walls such that when the exit dampers are in a closed position, the closed exit dampers de- fine a generally horizontal flat exit structure extending between the pair of end walls, and from the opposed other wall of the pair of end walls from which the by-pass dampers extend from, to the tube roof in order to pivotally open to allow the flow of combustion gases from the water conduit tubes through the combustion gas outlet. The pro- cess for recovering heat from hot combustion gases flowing through the combustion gas inlet comprises closing pivotally the by-pass dampers which essentially simultaneously divert or change the direction of flow of the hot combustion gases towards the water conduit tubes in order to effect a heat transfer between the hot gases and the water passing circuitously through the conduit tubes and extract con- densate from the hot gases which accumulates in the bottom of the heat recovery housing. The process additionally includes opening pivotally the exit dampers to allow the passage of gases from the water conduit tubes to the combustion gas outlet, and draining accu- mulated condensate from the bottom of the heat recovery housing through the condensate drain.
494912
Gordon Merrill K. Jr.
Smart & Biggar
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