Abstract 1,072,904. Heat exchanges. AMERICAN MACHINE & FOUNDRY CO. Nov. 2, 1964 [Nov. 26, 1963], No. 44598/64. Heading F4S. [Also in Divisions F1 and F2] An exhaust gas heat recovery silencer comprises a easing formed as two detachable parts 1, 2, having its interior space divided by a baffle 10 into two chambers interconnected only by an annular array of shroud tubes 15 (see also Fig. 6) which are either closely spaced or touch another and which extend through the baffle. The casing is connected into the exhaust gas line of an I.C. engine, furnace or other hot gas generator by way of ducts 6, 7 at each end of the casing, and heat is recovered from the gases by a liquid passing through longitudinally finned tubes 17 which extend through the shroud tubes and are joined at their opposite ends respectively to a return header 19 and a partitioned header 20 (see also Fig. 11) having inlet and outlet connections 22, 23 which extend through stuffing box glands (see also Fig. 9) in an end wall 4 of the casing. The connection 6 is elongated as shown to extend into the tube annulus thereby providing a tortuous path for the gases. Either of the connections 6 or 7 may comprise the exhaust gas inlet and similarly the liquid may enter the tubes through either of the connections 22 or 23. By removing the bolts 3 holding the casing sections together, the subassembly of tubes 15 and 17 and the baffle 10 may be withdrawn enabling relative axial movement between the tubes 15 and 17 to be effected to break up deposits of ash &c. from the gases. Such deposits may be removed by injecting air or steam and by using swabs or brushes between the fins 18 of the tubes 17.
A SILENCER AND HEAT-RECOVERY UNIT FOR INSERTION IN THE EXHAUST LINE OF AN ENGINE, COMPRISING: (A) TWO SEPARABLE SHELLS MATING AT A COUPLING ZONE TO FORM A CLOSED VESSEL AND HAVING AN EXHAUST-LINE PIPE EXTENDING THROUGH THE END OF EACH SHELL AND PARALLEL WITH THE AXIS OF THE VESSEL WHEN THE SHELLS ARE MATED; (B) A BAFFLE PLATE INSERTED IN THE VESSEL AND LYING THEREACROSS IN SAID ZONE WHERE THE SHELLS MATE; (C) MEANS FOR SECURING TOGETHER THE SHELLS AND THE BAFFLE PLATE AT SAID ZONE; (D) A MULTIPLICITY OF SHROUD TUBES EACH EXTENDING THROUGH AND SECURED TO THE BAFFLE PLATE, THE ENDS OF THE TUBES COMMUNICATING WITH THE TWO EXHAUST LINE PIPES BUT BEING OFFSET FROM AND OUT OF ALIGNMENT THEREWITH AND THE TUBES EXTENDING NEARLY THE FULL LENGTH OF THE VESSEL IN THE AXIAL DIRECTION; (E) A MULTIPLICITY OF HEAT-EXCHANGE TUBES WITHIN THE VESSEL AND EACH PASSING THROUGH A SHROUD TUBE IN SPACED RELATION THERETO, AND THE HEAT-EXCHANGE TUBES BEING INTERCONNECTED AT THEIR ENDS; AND
Claim 2
Dependent Claim
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A SILENCER AND HEAT-RECOVERY UNIT FOR INSERTION IN THE EXHAUST LINE OF AN ENGINE, COMPRISING: (A) TWO SEPARABLE SHELLS MATING AT A COUPLING ZONE TO FORM A CLOSED VESSEL AND HAVING AN EXHAUST-LINE PIPE EXTENDING THROUGH THE END OF EACH SHELL AND PARALLEL WITH THE AXIS OF THE VESSEL WHEN THE SHELLS ARE MATED; (B) A BAFFLE PLATE INSERTED IN THE VESSEL AND LYING THEREACROSS IN SAID ZONE WHERE THE SHELLS MATE; (C) MEANS FOR SECURING TOGETHER THE SHELLS AND THE BAFFLE PLATE AT SAID ZONE; (D) A MULTIPLICITY OF SHROUD TUBES EACH EXTENDING THROUGH AND SECURED TO THE BAFFLE PLATE, THE ENDS OF THE TUBES COMMUNICATING WITH THE TWO EXHAUST LINE PIPES BUT BEING OFFSET FROM AND OUT OF ALIGNMENT THEREWITH AND THE TUBES EXTENDING NEARLY THE FULL LENGTH OF THE VESSEL IN THE AXIAL DIRECTION; (E) A MULTIPLICITY OF HEAT-EXCHANGE TUBES WITHIN THE VESSEL AND EACH PASSING THROUGH A SHROUD TUBE IN SPACED RELATION THERETO, AND THE HEAT-EXCHANGE TUBES BEING INTERCONNECTED AT THEIR ENDS; AND