(19)
(11)EP 2 828 586 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
04.05.2016 Bulletin 2016/18

(21)Application number: 13718920.5

(22)Date of filing:  15.03.2013
(51)International Patent Classification (IPC): 
F24H 1/26(2006.01)
F24H 1/44(2006.01)
F24H 1/40(2006.01)
(86)International application number:
PCT/PL2013/000032
(87)International publication number:
WO 2013/141727 (26.09.2013 Gazette  2013/39)

(54)

FIRED HEAT EXCHANGER

BEHEIZTER WÄRMETAUSCHER

ÉCHANGEUR DE CHALEUR À COMBUSTION


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 22.03.2012 PL 39858512

(43)Date of publication of application:
28.01.2015 Bulletin 2015/05

(73)Proprietor: AIC Spólka Akcyjna
81-577 Gdynia (PL)

(72)Inventors:
  • KUZMA, Mariusz
    PL-83-000 Pruszcz Gda ski (PL)
  • SIEMIENCZUK, Tomasz
    PL-81-351 Gda sk (PL)

(74)Representative: Pomianek, Grazyna 
Kancelaria Patentowo-Prawna Grazyna Pomianek ul. Subislawa 23 C lok. 7
80-354 Gdansk
80-354 Gdansk (PL)


(56)References cited: : 
CA-A1- 2 583 645
GB-A- 1 233 534
US-A- 1 642 600
FR-A1- 2 273 239
GB-A- 1 448 670
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description


    [0001] The invention relates to a fired heat exchanger, used especially in industrial central heating systems.

    [0002] Polish patent application PL 383 188 A3 discloses a heat exchanger for heating fluids in central heating systems, which comprises a set of tubes of different diameters and dual walls forming cylindrical gaps along the entire length of the tubes, through which water flows and which are closed at the bottom and top and all the gaps in the walls, through which water flows are connected with stub pipes at the bottom and top. Cylindrical channels are located between the tubes around their entire circumference and along the full height, through which exhaust flows. The set of tubes is concentrically and vertically arranged. The external tube of the exchanger with dual walls is closed at the top with an external and internal bottom. The exhaust tube passes through the bottom sides and between the external and internal bottom, and there is a stabilisation and drainage tank for hot fluid. The external tube of the exchanger is higher than the internal tubes; it forms a cylindrical chamber at the bottom that houses a burner or other source of heat.

    [0003] Polish patent application PL 386 411 A3 discloses a heat exchanger for heating fluids in central heating systems, which comprises a tightly connected set of elements through which heated fluid flows. These elements are located in a cylindrical jacket and positioned in spaced arrangement to create gaps for exhaust flow. The exchanger jacket is longer than the remaining elements and is covered at the top with a dual wall head, which forms a stabilisation and drainage tank for hot fluid. The chamber that houses the burner, over which an exhaust deflector is located, is placed on the bottom in the exchanger axis.

    [0004] International patent application PCT /KR2008/006438 (WO2009/078577) discloses a known boiler that has a cylindrical enclosure, a vertical fluid-gas exchanger with combustion chamber located in the top section as well as a set of tube elements through which exhaust flows, located inside the external jacket, forming a chamber through which heated water flows.

    [0005] GB 1 233 534 A discloses a heat exchanger according to the preamble of claim 1 which comprises an inner metal shell forming an internal combustion chamber, one or both end walls of the shell having its or their heat transmission surface area extended, and an outer shell surrounding the or each end and forming in combination with the inner shell conduit means for passing heat-transfer liquid over the exterior of the or each end wall of the inner shell in heat exchange relation with its outer surface.

    [0006] The purpose of the invention is to develop a heat exchanger design facilitating control of the heated fluid flow rate and to reduce exchanger dimensions, which allows for a gain of material savings.

    [0007] Fired heat exchanger comprising an external jacket, combustion chamber equipped with an inlet for the introduction of a burner and a flow chamber of heated fluid equipped with an inlet and outlet stub pipe, and inside the external jacket of a cylindrical shape, closed at one end with a bottom and on the other with bottom fitted with a hole, there is an internal jacket also in the shape of a cylinder, closed on the same side as the external jacket with a bottom and on the other with a bottom fitted with a hole, however, between the holes in the bottoms, there is a common inlet for introducing a burner to the combustion chamber located inside the internal jacket, and in the side wall of the internal and external jacket, there is a common exhaust outlet hole, and between the internal and external jacket, there is a sealed chamber for heated fluid flow, according to the invention, is characterised in that a tube array connected to the heated fluid flow chamber is located inside the exhaust outlet hole. Preferably, the ratio of fluid flow chamber cross-section radius Rz to combustion chamber cross-section radius Rw is within the range:


    To reduce the size of the exchanger, the combustion chamber is misaligned in relation to the heated fluid flow chamber.
    Moreover, the flow direction control baffles are located inside the heated fluid flow chamber.
    Preferably, an additional tube array for heat exchange is connected to the external jacket within the area of the exhaust outlet hole.

    [0008] The fired heat exchanger, according to the invention, provides easy control of space inside the heated fluid flow chamber and of flow rate.

    [0009] The invention is presented in exemplary embodiments in figures in which fig. 1 - presents exchanger equipped with array of tubes in axonometric projection, fig. 2 - side view of exchanger given in fig. 1, fig. 3 - axial section of exchanger shown in fig. 1, fig. 4 - cross-section of exchanger with misaligned combustion chamber without array of tubes, fig. 5 - cross-section of exchanger shown in fig. 4 with tube array, fig. 6 - exchanger with additional heat exchange array.

    [0010] According to the invention, the fired heat exchanger comprises an external jacket 2 in a cylindrical shape closed on one end with a bottom 9 and on the other with a bottom 10 fitted with hole.
    The external jacket 2 houses an internal jacket 1 also of a cylindrical shape, closed on one end like the external jacket 2 with a bottom 11 and on the other with a bottom 12 fitted with hole. Between the holes in the bottoms 10 and 12, a common passage 5 is formed to introduce a burner into the combustion chamber 13 located inside the internal jacket 1. A common outlet hole 14 for exhaust is made in the side wall of the internal jacket 1 and the side wall of the external jacket 2. Between the internal jacket 1 and the external jacket 2, there is a scaled chamber 4 for heated fluid flow, wherein flow direction control baffles 6 are located. The combustion chamber 13 is misaligned in relation to the flow chamber 4 of heated fluid, so that the chamber axes are misaligned by value x. The exchanger is equipped with a tube array 3 installed in the exhaust outlet hole 14, which expands the heat exchange area, connected to the heated fluid flow chamber 4. Chamber 4 is equipped with two inlet stub pipes 8 of heated fluid located in the lower part of the bottom 9 and the outlet stub pipe 7 located in the upper part of the bottom 9. Heat generated in the combustion chamber 13 is collected by fluid circulating in chamber 4 and tube array 3.

    [0011] According to the second embodiment of the invention, the exchanger described in the first embodiment is equipped with an additional heat exchange tube array 15 connected to the external jacket 2 within the area of the exhaust outlet hole 14. The tube array 15 can be releasably or non-releasably connected. Hot exhaust out-flowing from the combustion chamber 13 through the exhaust outlet 14 flows around the tube array 15, providing heat to the fluid heated inside.


    Claims

    1. A fired heat exchanger comprising an external jacket, sealed heated fluid flow chamber (4) equipped with an inlet and outlet stub pipe and a combustion chamber equipped with an inlet for the introduction of a burner, and inside the external jacket (2) of a cylindrical shape, closed at one end with a bottom (9) and on the other with a bottom (10) fitted with a hole, there is an internal jacket (1) also in the shape of a cylinder, closed on the same side as the external jacket (2) with a bottom (11) and on the other with a bottom (12) fitted with a hole, however, between the holes in the bottoms (10, 12), there is a common inlet (5) for introducing a burner to the combustion chamber (13) located inside the internal jacket (1), and in the side wall of both jackets, internal (1) and external (2), there is a common exhaust outlet hole (14), and between the internal jacket (1) and external jacket (2), there is said sealed chamber (4) for heated fluid flow, characterised in that a tube array (3) connected to the sealed heated fluid flow chamber (4) is located inside the exhaust outlet hole (14).
     
    2. The exchanger according to claim 1, characterised in that the ratio of fluid flow chamber (4) cross-section radius Rz to combustion chamber (13) cross-section radius Rw is within the range: 1<Rz/Rw≤10.
     
    3. The exchanger according to claim 1 or 2, characterised in that the combustion chamber (13) is misaligned in relation to the heated fluid flow chamber (4).
     
    4. The exchanger according to claim 1 through 3, characterised in that flow direction control baffles (6) are located inside the heated fluid flow chamber (4).
     
    5. The exchanger according to claim 1, characterised in that an additional heat exchange tube array (15) is connected to the external jacket (2) within the exhaust outlet hole (14) area.
     


    Ansprüche

    1. Beheizter Wärmetauscher mit Außenmantel, dichter Durchflusskammer (4) für die zu erwärmende Flüssigkeit mit Ein- und Austrittsstutzen sowie mit Brennkammer mit Öffnung zum Einführen des Brenners. Im Innern des zylinderförmigen Außenmantels (2), der auf der einen Seite durch den Boden (9) und auf der anderen Seite durch den Boden (10) mit Öffnung verschlossen ist, befindet sich der innere, ebenfalls zylindrische Mantel (1), der auf der gleichen Seite wie der Außenmantel (2) mit einem Boden (11) und auf der anderen Seite durch den Boden (12) mit Öffnung verschlossen ist, wobei sich zwischen den Öffnungen in den Böden (10, 12) der gemeinsame Eingang (5) für das Einführen des Brenners in die Brennkammer (13) befindet, der im Innern des inneren Mantels (1) platziert ist. In der Außenwand des Innenmantels (1) und des Außenmantel (2) befindet sich die gemeinsame Ausgängsöffnung (14) für die Abgase. Zwischen dem Innenmantel (1) und dem Außenmantel (2) befindet sich die bereits erwähnte dichte Durchflusskammer (4) für die zu erwärmende Flüssigkeit, die dadurch gekennzeichnet ist, dass sich in der Austrittsöffnung (14) für die Abgase ein Rohrbündel (3) befindet, das mit der dichten Durchflusskammer (4) für die zu erwärmende Flüssigkeit verbunden ist.
     
    2. Wärmetauscher nach Anspruch 1, der dadurch gekennzeichnet ist, dass sich das Verhältnis des Radius Rz des Querschnitts der Durchflusskammer (4) für die zu erwärmende Flüssigkeit zum Radius Rw des Querschnitts der Brennkammer (13) im Bereich 1<Rz/Rw≤10 befindet.
     
    3. Wärmetauscher nach Anspruch 1 oder 2, der dadurch gekennzeichnet ist, dass sich die Brennkammer (13) nicht in der gleichen Achse befindet, wie die Durchflusskammer (4) für die zu erwärmende Flüssigkeit.
     
    4. Wärmetauscher nach Anspruch 1 bis 3, der dadurch gekennzeichnet ist, dass sich in der Durchflusskammer (4) für die zu erwärmende Flüssigkeit Wände (6) für die Regulierung der Fließrichtung befinden.
     
    5. Wärmetauscher nach Anspruch 1, der dadurch gekennzeichnet ist, dass an den Außenmantel (2) in der Nähe der Austrittsöffnung (14) für die Abgase ein zusätzliches Wärmetauscherrohrbündel (15) angeschlossen ist.
     


    Revendications

    1. Échangeur de chaleur à combustion possédant une chemise extérieure, une chambre étanche (4) de passage du liquide à chauffer équipée d'un manchon d'admission et d'un manchon de refoulement, une chambre de combustion équipée d'une entrée pour l'introduction d'un brûleur et, à l'intérieur de ladite chemise extérieure (2) d'une forme cylindrique, fermée d'un côté par un fond (9) et de l'autre côté d'un fond (10) avec une ouverture, se trouve une chemise intérieure (1) ayant également une forme cylindrique, fermée d'un côté, comme ladite chemise extérieure (2), par un fond (11) et, de l'autre côté, par un font (12) avec une ouverture, dans lequel, entre les ouvertures dans les fonds (10, 12) se trouve une entrée commune (5) pour l'introduction d'un brûleur dans la chambre de combustion (13) située à l'intérieur de la chemise intérieure (1), dans lequel, dans les parois latérales des deux chemises, intérieure (1) et extérieure (2), est ménagée une ouverture commune (14) d'évacuation des gaz d'échappement, et dans lequel, entre la chemise intérieure (1) et la chemise extérieure (2) se trouve ladite chambre étanche (4) pour le passage du liquide à chauffer, caractérisé en ce que dans l'ouverture de sortie (14) des gaz d'échappement se trouve un ensemble de tubes (3) connecté à la chambre étanche (4) de passage du liquide à chauffer.
     
    2. L'échangeur selon la revendication 1 caractérisé en ce que le rapport entre le rayon Rz de la section transversale de la chambre (4) pour le passage du liquide à chauffer et le rayon Rw de la section transversale de la chambre de combustion (13) est comprise dans la plage : 1<Rz/Rw≤10.
     
    3. L'échangeur selon la revendication 1 ou 2, caractérisé en ce que la chambre de combustion (13) est située de façon excentrée par rapport à la chambre (4) de passage du liquide à chauffer.
     
    4. L'échangeur selon les revendication de 1 à 3, caractérisé en ce que dans la chambre (4) de passage du liquide à chauffer se trouvent des cloisons (6) pour ajuster la direction du flux.
     
    5. L'échangeur selon la revendication 1 caractérisé en ce qu'un ensemble de tubes (5) d'échange de chaleur est connecté à la chemise extérieure (2) dans l'espace de l'ouverture d'évacuation (14) des gaz d'échappement.
     




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    Cited references

    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description