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Publication numberUS3529579 A
Publication typeGrant
Publication dateSep 22, 1970
Filing dateApr 24, 1969
Priority dateApr 24, 1969
Publication numberUS 3529579 A, US 3529579A, US-A-3529579, US3529579 A, US3529579A
InventorsLeon Jacques Wanson
Original AssigneeLeon Jacques Wanson
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Multitubular boiler
US 3529579 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

United States Patent lnve ntor Le'on Jacques Wanson 118 Avenue lsidore Gheyskens, Auderghem, Belgium Appl. No. 819,054 Filed April 24, 1969 Patented Sept. 22, I970 MULTITUBULAR BOILER 1 Claim, 2 Drawing Figs.

US. Cl 122/248 int. Cl F22b 21/28 Field of Search l22/ 247,

[56] References Cited UNITED STATES PATENTS 1,970,747 8/1934 Hamm et al. V l22/248X 2,645,210 7/1953 Harris et al. 122/248 Primary Examiner-Kenneth W. Sprague Attorney-Young and Thompson ABSTRACT: A multitubular boiler including several layers of coiled tubes wherein two adjacent coils pertain to two different tubes in the same layer is provided with a double jacket wherein at least a fraction of the air admitted to the burner is circulated for preheating it.

MULTITUBULAR BOILER FIELD OF THE INVENTION The present invention relates to a multitubular boiler for a heat transfer fluid designed to be used with a circulation loop feeding heat exchanging apparatuses.

BACKGROUND OF THE INVENTION Boilers provided with a double-jacket wherein at least a fraction of the air admitted to the burner is circulated for preheating it are well known. Multitubular boilers provided with several layers of coiled tubes wherein two adjacent coils pertain to two different tubes in the same layer are also known.

SUMMARY OF THE INVENTION The object of the invention is a boiler combining the advantages of the boilers of said both types, with none of the drawbacks thereof. The invention consists in arranging a coil system identical to that of a boiler of the second type in a jacket-system similar to that of a boiler of the first type. It has been found that a very compact boiler is obtained in this way, which, notwithstanding its small dimensions, yields a great calorific power that is higher than that which could theoretically be anticipated by merely adding together the particulars of the boilers of said both types. It is believed that the novel effect obtained by the inventive apparatus results from the relative arrangement of the different circuits.

DRAWING In the appended drawing:

FIG. 1 shows a longitudinal section of a boiler according to the present invention.

FIG. 2 shows a detail of the boiler of FIG. 1, taken along arrow P on FIG. 1.

The boiler according to the present invention comprises a plurality (illustratively three) of layers 100, 200, 300, each including a number of concentric coiled tubes. The internal layer defines the peripheral wall of a fire box 10 provided with a central burner 25. The adjacent successive coils 1, 2, 3, 4 of the external layer 100 are connected to a distributor 5--as shown as 6, 7, 8, 9. The next following coils l, 2, 3', 4 are connectcdto the preceding ones in the same order, coil 1 being continued by coil 1', coil 2 beingcontinued by coil 2 and soon. The general flowing direction is from the left to the right as viewed on FIG. 1 in the layer 100, then from the right to the left in layer 200 and from the left to the right in the layer 300. The fluid is discharged from the coils placed at the right end of layer 300 by means of tubes such as 301 provided with individual flow-rate controlling devices (not shown).

Layer 100, which is fed with cold fluid through distributor 5 is surrounded by a first sheet jacket 23. A second jacket 22 surrounds thejacket 23 with a first annular space 320 between them. A third jacket 21 surrounds jacket 22 with a second annular space between them. These annular spaces 320 and 120 are closed by means of a common wall 132 at their end adjacent to the distributor 5. An annular fume box 13 is connected to a stack 14. Fume tubes 12, connected to fire box 10 by the end of the tubes located on the burner side, extend through space 320 and are connected to the fume box 13. The latter is enclosed as a whole in the external jacket 21. The end of space 320, on the burner side, is connected through an annular space 15 to an air inlet chamber 17. This chamber is fed by the fan 16 through chamber 26 and passages 18. Other passages 19, the aperture of which is ad ustable through axial displacement of an annular register 27 are connected with a chamber 24 surrounding externally the annular chamber 15 and that is connected to the annular space 120 on the burner side of the boiler. The air fed by the fan 16 passes from chamber 26 to chamber 24 along arrows f4 while being preheated. It passes around the fume box 13 and flows along arrows f5 into chamber 15 and hence it reaches the burner along arrows f6. The temperature of the air increases gradually as it progresses along the fume tubes 12, which are circulating hot fumes in the opposite direction.


1. Boiler for heat transfer fluid comprising a plurality of similarly shaped tube means circulating a heat transfer fluid, arranged in several coaxially extending layers, each layer being comprised of a number of successive sets of adjacent coils wound such that at least two adjacent coils in each set pertain to two different ones of said tube means, the most internal of said layers defining a cylindrical fire box having first and second ends, a central burner means adjacent to said first end of said fire box and having at least one inlet for combustion-supporting air, a first end wall for said fire box at said second end thereof, a first jacket means surrounding the most external of said layers, a second jacket means extending coaxially to said first jacket means and surrounding same in a spaced apart relationship to form between said first and second jacket means a first annular chamber, a third jacket means extending coaxially to said first and second jacket means and surrounding said second jacket means in a spaced apart relationship to form between said second and third jacket means a second annular chamber, a second end wall for said first and second annular chambers at said second end of said fire box, a fume box means near said second end of said fire box and adapted to be connected to a stack, a plurality of fume tube means having a first end thereof adjacent to said first end of said fire box and communicating with same, extending longitudinally to said first annular chamber and having a second end thereof connected to said fume box means, a passage between said first and second annular chamber adjacent to said second end of said fire box, a third chamber adjacent to said first end of said fire box and coupling said first annular chamber to said air inlet to said burner means, and means to intake air under pressure into said second annular chamber on the side of said fire box, which is adjacent to said first end thereof, distributor means for said heat transfer fluid adjacent to said second end of said fire box and independently connected to the first set of adjacent coils of said most external layer.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3831560 *May 10, 1973Aug 27, 1974Bertrans H AgCoil-type continuous flow heater
US3841273 *Sep 27, 1973Oct 15, 1974Sioux Steam Cleaner CorpMulti-pass heating apparatus with expandable air cooled jacket
US4029056 *Jan 16, 1976Jun 14, 1977Leon Jacques WansonCompact indirect heating vapor generator
US4055952 *Nov 11, 1975Nov 1, 1977Forenade FabriksverkenHeating device for an external combustion engine
US4357910 *Nov 28, 1980Nov 9, 1982Blockley Eugene TMulti-pass helical coil thermal fluid heater
US4377132 *Feb 12, 1981Mar 22, 1983Texaco Development Corp.Synthesis gas cooler and waste heat boiler
US4497281 *Apr 23, 1984Feb 5, 1985Bs&B Engineering Company Inc.Heater
US5555850 *May 13, 1994Sep 17, 1996Morris F. GarciaMethod and apparatus for heating liquid
US5713310 *Apr 22, 1996Feb 3, 1998Clarke Industries, Inc.Heat exchanger for pressure washer
US6085701 *Apr 12, 1999Jul 11, 2000Clean Burn, Inc.Coil tube heater for a used-oil fired furnace
US8122855 *Jan 9, 2007Feb 28, 2012Viessmann Werke Gmbh & Co. KgBoiler
US9316409 *Aug 16, 2012Apr 19, 2016Enerpro Inc.Heat exchanger including waste heat recovery
US20060192388 *Feb 27, 2006Aug 31, 2006Miura Co., Ltd.Boiler driving power supply system
US20090056647 *Jan 9, 2007Mar 5, 2009Viessmann Werke Gmbh & Co., KgBoiler
US20130042823 *Aug 16, 2012Feb 21, 2013Seyed Jafar MirjalaliHeat exchanger including waste heat recovery
EP0197049A1 *Aug 29, 1985Oct 15, 1986Vapor CorporationAir preheater for a compact boiler
EP0197049A4 *Aug 29, 1985Aug 10, 1987Vapor CorpAir preheater for a compact boiler.
EP0786624A3 *Jan 24, 1997Mar 1, 2000Nippon Furnace Kogyo Kabushiki KaishaSmall once-through boiler
WO1990011472A1 *Mar 19, 1990Oct 4, 1990Cubit LimitedHeat exchanger
U.S. Classification122/248
International ClassificationF22B31/08, F22B21/26
Cooperative ClassificationF22B21/26, F22B31/08
European ClassificationF22B21/26, F22B31/08