EP0634610A1 - Combined burner air supply and combustion gas discharge system - Google Patents

Combined burner air supply and combustion gas discharge system Download PDF

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Publication number
EP0634610A1
EP0634610A1 EP94201864A EP94201864A EP0634610A1 EP 0634610 A1 EP0634610 A1 EP 0634610A1 EP 94201864 A EP94201864 A EP 94201864A EP 94201864 A EP94201864 A EP 94201864A EP 0634610 A1 EP0634610 A1 EP 0634610A1
Authority
EP
European Patent Office
Prior art keywords
combustion gas
gas discharge
pipe
air supply
apron
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP94201864A
Other languages
German (de)
English (en)
French (fr)
Inventor
Ietse Jan Pestoor
Andreas Bernard Cantineaux
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Meulink & Grol Bv
Original Assignee
Meulink & Grol Bv
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Meulink & Grol Bv filed Critical Meulink & Grol Bv
Publication of EP0634610A1 publication Critical patent/EP0634610A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L17/00—Inducing draught; Tops for chimneys or ventilating shafts; Terminals for flues
    • F23L17/02—Tops for chimneys or ventilating shafts; Terminals for flues
    • F23L17/04—Balanced-flue arrangements, i.e. devices which combine air inlet to combustion unit with smoke outlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2211/00—Flue gas duct systems
    • F23J2211/10—Balanced flues (combining air supply and flue gas exhaust)
    • F23J2211/101—Balanced flues (combining air supply and flue gas exhaust) with coaxial duct arrangement

Definitions

  • the present invention relates to a combined burner air supply and combustion gas discharge system, comprising an air supply pipe and accommodated therein a combustion gas discharge pipe, which pipes are provided at one end with connections shut off relative to each other, for connection to the air supply and the combustion gas discharge respectively of a burner, and the opposite-lying outside ends of which pipes open out into the environment and form an air inlet opening and a combustion gas discharge opening, the combustion gas discharge pipe running past the air supply pipe.
  • the object of the invention is to provide a combination with considerably less recirculation. This is achieved by a combination in which the air inlet opening and/or the combustion gas discharge opening open out radially on the periphery into the environment only at one respective side of the combination, and can be rotated about the longitudinal axis of the combination, for purposes of orientation relative to the prevailing air flow in the environment under the influence of wind orientation means.
  • the invention is also directed to provide a combination of simple structure, which is effectively to fabricate and is reliable in its function.
  • the invention is directed to the provision of features for solving the problem of pressure-built up in the air intake, preferably in combination with the decrease of recirculation.
  • a so-called cowl which is placed on the top end of a flue duct is known per se from e.g. FR-A-1 169 667. Its purpose is to prevent smoke from being blown back down by the wind.
  • the cowl consists of a cap-shaped part which can swivel about a vertical axis, which axis lies essentially concentrically with the flue duct.
  • This cap-shaped part can be regarded as part of a dome-shaped vault with sloping upright walls extending through an arc angle of approximately 135 .°When it is being fixed on a flue duct, it is ensured that the bottom edge of the cap-shaped part lies essentially flush with the wall of the flue duct.
  • cowl By means of a weather vane placed on the cowl, the latter is directed with its side facing away from the flue duct towards the windward side, thus providing a certain protection against wind beating into the flue duct.
  • the object of this known cowl is not to direct the flue gas discharge opening of the combustion gas discharge pipe in order to discharge the combustion gases in a directed manner.
  • a cowl is used only for conventional combustion gas discharge ducts of wood stoves and the like.
  • Such a cowl is not used in forced-draught closed duct systems, as in the case of a combined burner air supply and combustion gas discharge system according to the present subject.
  • FIG 1 shows diagrammatically an air supply and combustion gas discharge combination 1, with a combustion air supply pipe 2 and a combustion gas discharge pipe 3.
  • a central heating combustion boiler (not shown) is to be connected to the combustion air supply pipe 2 or the combustion gas discharge pipe 3, for example as indicated in Figure 1 of EP-A-0491444.
  • the burner is inside a building, and the pipes 2 and 3 debouch into the surrounding atmosphere.
  • the pipes 2, 3 run concentrically from a branch pipe 4 which is known per se, with the combustion gas discharge pipe 3 inside the combustion air supply pipe 2. Above the roof, the position of which is shown only diagrammatically here by means of dashed and dotted lines 5, the pipes 2, 3 open out into the environment, as usual the combustion gas discharge pipe 3 opening out at a higher level.
  • the combustion gas discharge pipe 3 opens out into a duct part 6 which is deflected, so that the gases rising vertically through the combustion gas discharge pipe 3 are deflected in a horizontal direction, in such a way that the gases leave the combination 1 radially on the periphery only at one side.
  • This deflected duct part 6 is accommodated in a cap 7, which is freely rotatable about the longitudinal axis of the combustion gas discharge pipe 3.
  • This duct part 6 is narrowed towards the free mouth, in order to accelerate the combustion gases, which reduces the recirculation even further.
  • Fixed on top of the cap 7 is a weather vane 8, which is fitted on the cap 7 in a manner known to the person skilled in the art, in such a way that the duct part 6 in each case opens out into the atmosphere at the leeward side.
  • the top side of said apron 9 is flat, so that any downgoing combustion gases are made turbulent, and recirculation is thus limited further.
  • said apron 9 has on the lower edge thereof an inward directed flange 11, which with the exception of a peripheral part runs through to the outside wall of the combustion air supply pipe 2 and connects to it in an essentially gastight manner.
  • a gap 12 is formed between the underside of the apron 9 and the outer casing 13 of the combination 1, through which gap 12 the air inflow from the environment to the combustion air supply pipe 2 essentially occurs.
  • said gap 12 runs halfway round the periphery.
  • the gap can extend over a shorter distance, or it can be divided into connecting parts with flange material between them. Due to the provision of this gap 12 and its shape, recirculation is decreased even further, while its structure is rather simple.
  • This apron 9 is also mounted so that it is freely rotatable about the longitudinal axis of the combustion gas discharge pipe 3, in such a way that the gap 12 is also on the windward side of the combination 1.
  • the apron 9 is coupled to the vane 8. Consequently, combustion air is in each case supplied at the windward side of the combination 1, while combustion gases are in each case discharged at the leeward side thereof. This largely prevents downward drifting combustion gases from being sucked hack in again through the combustion air supply pipe 2.
  • the combustion air supply pipe 2 is reliably screened off by means of the flange 11 bounding the gap 12 from the influence of wind gusts on the prevailing pressure inside the combination 1 and the combustion boiler (not shown) coupled thereto.
  • This calming action is reinforced even further by an outward projecting annular flange 14 which is fitted at a distance below the apron 9 around the outer casing 13.
  • this flange 14 can be left out under circumstances.
  • Another advantage is provided by the gap 12 delimited by the flange 11 and the side wall of the pipe 13 in that there is less tendency of pressure-built up in the air intake pipe 2 due to enviromental wind forces which could lead to malfunctioning of the burner. It is thought that this effect is caused due to the small width of the gap 12 w.r.t. the distance between the pipe 13 and the apron 9.
  • the above mentioned EP-A is directed to the problem of pressure built up as well, but does not provide an improved recirculation behaviour at the same time.
  • the gap 12 would run around the pipe 13 for more than 1/2 of its periphery, e.g. 3/4 or fully around, the recirculation effect would be less, however the pressure-built up effect would be maintained.
  • the feature of the gap 12 could be applied without the features of directing the inlet and/or the outlet according to the winddirection.
  • a further decrease of pressure built-up is attained by the flange 14 which provides a further, horizontal directed, gap in cooperation with the apron 9 and the flange 11.
  • the apron 9 itself is moveable, but it is meant that the gap 12 can be moved around the pipe 13.
  • the gap 12 could be running all around the pipe 13, and could be partly covered by a shut-off means such as a plate (not shown) which is sliding over the flange 11 and which can be rotated around the pipe 13.
  • a shut-off means such as a plate (not shown) which is sliding over the flange 11 and which can be rotated around the pipe 13.
  • the top of the apron 9 can be inclined as well in stead of being almost horizontal as shown.
  • the gap 12 is shown closest to the pipe 13, while the flange 11 is connected to the apron 9.
  • the outlet of the duct part 6 and the gap 12 are thus always directed in such a way to the prevailing wind direction that they lie diametrically opposite each other relative to the longitudinal axis of the combustion gas discharge pipe 3, with the gap 12 in each case facing the windward side and the mouth of the duct part 6 always facing the leeward side of the combination 1.
  • FIG. 3 shows a second embodiment of the present invention, in which principally the shape of the apron 9 is changed.
  • said apron 9 now grips more tightly around the outer casing 13, while roughly around half the periphery said apron is provided with a series of vertical slits 15 of uniform mutual pitch. Combustion air is sucked from the environment into the combustion air supply pipe 2 through said slits 15.
  • the cap 7 and the apron 9 are freely rotatable about the longitudinal axis of the combustion gas discharge pipe 3, and here again in each case the vane 8 ensures that the duct part 6 opens out at the leeward side and the slits 15 are directed to the windward side.
  • the vane 8, the cap 7 with the duct 6 immovably fixed therein and the apron 9 are attached to one another by means of a pipe part 16 which grips in a freely rotatable manner around the combustion gas discharge pipe 3.
  • annular flange 14 Since by comparison with the embodiment according to Figure 1 the annular flange 14 does not have any effect here in limiting the influence of wind gusts on the prevailing pressure in the combination 1, said flange is omitted from Figure 3.
  • This embodiment requires only few components for preventing recirculation, and is therefor a relatively cheap, reliable structure.
  • the amount and dimensions of the slits 15 can be selected such that pressure built-up and recirculation can be kept to a minimum.
  • the top of the apron 9 can be inclined in stead of horizontal too.
  • FIG 4 shows diagrammatically another embodiment of the cap 7 to be connected to the top end of the combustion gas discharge pipe 3.
  • a duct part 6, which again is tapered towards the free mouth, runs inside the cap 7, which is now in the form of an essentially cylindrical housing, and which is freely rotatable about the longitudinal axis of the duct 3.
  • This duct part 6 is now deflected through an angle of less than 90 °.
  • the gazes flowing vertically upwards through the duct 3 are accelerated by the duct part 6, and are deflected in such a way that they flow away radially at one side of the combination 1.
  • FIG. 5 A third variant of the invention is shown in Figures 5 and 6.
  • the cap 7 only partially surrounds the deflected duct part 6.
  • Vertical slits 17 are provided in the cap 7, both at the side of the free mouth of the duct part 6 and diametrically opposite such opening.
  • a forced air stream all around the top end of the duct part 6 in the direction of the arrow shown in Fig. 6A is maintained by means of such slits, in order to reinforce the discharge of the combustion gases to the leeward side.
  • Transverse bars 18 are placed in the free opening, as shown. They prevent, for example, birds from gaining access to the combination 1.
  • the duct part 6 tapers towards the free mouth.
  • the underside of the duct part 6 connects directly to the apron 9, and the cap 7 ends a good distance above the underside of the duct part 6.
  • said apron 9 is shown cut away at the underside in Fig. 5, so that the parts situated therein are visible.
  • an inward facing flange 11 is again situated on the underside of the apron 9, but together with the outer casing 13 (here shown in an imaginary fashion in Fig. 5) it bounds a gap 12 running around the full periphery of the combination.
  • the gap 12 runs through the downward facing side of a duct 20 also running around half the periphery of the combination 1.
  • This duct 20 is open at both longitudinal sides, and opens out there into the space enclosed by the apron 9 and the flange 11, in order to be in communication with the combustion air supply pipe 2, which is not shown here (see Fig. 1).
  • this duct 20 is bounded on the inside by a plate 19, extending to below the flange 11 and surrounding the pipe 13.
  • said plate 19 has an outward directed collar (not visible), which runs along the entire top edge of the plate 19, and which connects to the apron 9.
  • the air supply is greatly limited from the side of the combination 1 at the mouth of the duct part 6, while air still flowing in from that side, for example due to an unexpected gust of wind, is guided through the duct 20 to the combustion air supply pipe 2.
  • FIG. 7 a fourth embodiment of the invention is shown in Figures 7 and 8.
  • the combination 1 has a cap 7, into which the combustion gas discharge pipe 3 opens directly.
  • Said cap 7 is freely rotatable about the longitudinal axis of the duct 3.
  • a weather vane of the type shown in Figure 1 can be placed on top of said cap 7, which is a symmetrical round shape, viewed from the top.
  • the cap 7 has an otherwise closed, disc-shaped top plate 21, and a likewise disc-shaped bottom plate 22 of corresponding diameter.
  • Both plates 21, 22 are held apart by means of four narrow strips 23 uniformly distributed around the periphery, only two of which can be seen here.
  • the duct 3 is in communication with the environment by way of said slits 25, 26.
  • a buffer plate 27 is also disposed inside the cap 7 and, as can be seen from Fig. 8, runs around the duct 3, enclosing half of it, and then also runs radially outwards relative to said duct 3 from positions diametrically opposite the duct 3.
  • said buffer plate 27 viewed from the side, one half of the cap 7 is thus separated in a gastight manner from the other half.
  • a gap 12 is provided in the bottom plate 22 at the side of the buffer plate 27 facing away from the duct 3. As shown, said gap 12 opens out into the combustion air supply duct 2, which in this embodiment connects with its casing 13 in an airtight manner to the bottom plate 22 of the cap 7. The gap 12 runs only over a peripheral part of the casing 13 therein.
  • the cap 7 in this embodiment consequently acts both for the air supply and for the combustion gas discharge, and by means of the buffer plate 27 the supply and discharge are largely separated from each other in a gastight manner. With this cap it is also possible to direct the supply to windward and the discharge to leeward, so that the air flow is in the direction indicated by the arrows.
  • the gap 12 and/or the buffer plate 27, for example can be formed differently, for example they can extend further or not as far along the casing 13 or the duct 3. What is important here is that a buffer plate is situated in the cap as a continuation of the discharge duct 3 and/or the supply duct 2, on either side of which the supply opening 12 or the discharge opening is situated. Making the cap 7 in such a way that it can be directed towards the wind means that the recirculation can be limited even further. However, the cap 7 can be made so that it is immovable.
  • apron 9 with the duct 20 as according to fig. 5 and 6 can be combined with other caps 7, such as according to fig. 1 or 4.
  • the cap according to fig. 4 can also be used in the embodiment according to fig. 1 or 3.
  • the object of the invention is thus to direct the mouth of the combustion air supply duct or the combustion gas discharge duct into the environment in such a way relative to the prevailing air flow that combustion gases are prevented as effectively as possible from being sucked in again.
EP94201864A 1993-07-15 1994-06-28 Combined burner air supply and combustion gas discharge system Withdrawn EP0634610A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9301246A NL9301246A (nl) 1993-07-15 1993-07-15 Gecombineerde branderluchttoevoer en verbrandingsgasafvoer.
NL9301246 1993-07-15

Publications (1)

Publication Number Publication Date
EP0634610A1 true EP0634610A1 (en) 1995-01-18

Family

ID=19862661

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94201864A Withdrawn EP0634610A1 (en) 1993-07-15 1994-06-28 Combined burner air supply and combustion gas discharge system

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EP (1) EP0634610A1 (nl)
NL (1) NL9301246A (nl)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1001077C2 (nl) * 1995-08-28 1997-03-03 Muelink & Grol Bv Van weerstandsorganen voorzien fluïdumvoerend kanaalelement alsmede van weerstandsorganen voorzien hulsdeel voor aanbrenging op een dergelijk kanaalelement.
EP1504804A1 (en) * 2003-08-01 2005-02-09 Eurotecno S.R.L. Arrangement for partial recirculation of exhaust gases from heating boilers powered by gas or other fuels
CN110081453A (zh) * 2018-01-26 2019-08-02 博世热力技术（上海）有限公司 锅炉气体循环装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1169667A (fr) * 1956-03-02 1959-01-05 Mitre ou appareil aspirateur de fumées pour cheminées
US3315586A (en) * 1965-06-03 1967-04-25 Autocrat Corp Vent and air inlet assembly
US4273032A (en) * 1979-10-18 1981-06-16 Spain Robert C Ventilator apparatus
US4893608A (en) * 1988-07-05 1990-01-16 Coleman Heating & Air Conditioning Products, Inc. Furnace roof jack with pivoting flashing plate
EP0491444A1 (en) * 1990-12-17 1992-06-24 Burgerhout B.V. Combined burner air supply and combustion gas exhaust

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1169667A (fr) * 1956-03-02 1959-01-05 Mitre ou appareil aspirateur de fumées pour cheminées
US3315586A (en) * 1965-06-03 1967-04-25 Autocrat Corp Vent and air inlet assembly
US4273032A (en) * 1979-10-18 1981-06-16 Spain Robert C Ventilator apparatus
US4893608A (en) * 1988-07-05 1990-01-16 Coleman Heating & Air Conditioning Products, Inc. Furnace roof jack with pivoting flashing plate
EP0491444A1 (en) * 1990-12-17 1992-06-24 Burgerhout B.V. Combined burner air supply and combustion gas exhaust

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1001077C2 (nl) * 1995-08-28 1997-03-03 Muelink & Grol Bv Van weerstandsorganen voorzien fluïdumvoerend kanaalelement alsmede van weerstandsorganen voorzien hulsdeel voor aanbrenging op een dergelijk kanaalelement.
EP0762054A1 (en) * 1995-08-28 1997-03-12 Muelink & Grol B.V. Pressure ring for roof duct
EP1504804A1 (en) * 2003-08-01 2005-02-09 Eurotecno S.R.L. Arrangement for partial recirculation of exhaust gases from heating boilers powered by gas or other fuels
CN110081453A (zh) * 2018-01-26 2019-08-02 博世热力技术（上海）有限公司 锅炉气体循环装置

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Publication number Publication date
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