WO2005093322A1 - Verfahren und heizölbrenner zur optimierung des verbrennungsvorgangs - Google Patents
Verfahren und heizölbrenner zur optimierung des verbrennungsvorgangs Download PDFInfo
- Publication number
- WO2005093322A1 WO2005093322A1 PCT/EP2005/002549 EP2005002549W WO2005093322A1 WO 2005093322 A1 WO2005093322 A1 WO 2005093322A1 EP 2005002549 W EP2005002549 W EP 2005002549W WO 2005093322 A1 WO2005093322 A1 WO 2005093322A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tube
- combustion chamber
- combustion
- oil burner
- flow
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/36—Details, e.g. burner cooling means, noise reduction means
- F23D11/40—Mixing tubes or chambers; Burner heads
- F23D11/404—Flame tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/006—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber the recirculation taking place in the combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/36—Details, e.g. burner cooling means, noise reduction means
- F23D11/40—Mixing tubes or chambers; Burner heads
- F23D11/408—Flow influencing devices in the air tube
Definitions
- the invention relates to a method and a heating oil burner for optimizing the nerburning process using a combustion chamber pipe which opens into a combustion chamber and to which a mixture of finely divided fuel and combustion air is fed at the end face.
- a heating oil burner of the type mentioned at the outset is known, for example, from DE-G 77 00 459.
- this device which is referred to as a blue-burning oil burner
- the fuel-air mixture is passed via a diaphragm opening which is coaxial to the axis of the pressure atomizing nozzle into a mixing tube which is connected to a flame tube is surrounded.
- the arrangement is such that on the outside of the mixing tube, some of the combustion products from the flame tube flow back into an intermediate space between the orifice and the adjacent end of the mixing tube, with the choice of the ratio of length to diameter of the mixing tube and flame tube on the one hand and the diameter of the flame tube and mixing tube, on the other hand, the desired combustion ratios are to be achieved.
- the object of the present invention is to design a method and a heating oil burner of the type mentioned at the outset in a manner which is technically simple to implement and in particular also retrofittable in such a way that, with the highest possible use of fuel and at the same time minimized environmental pollution caused by exhaust gases, there is a clear
- This object is achieved according to the invention essentially with respect to the method in that the mixture is fed to the combustion chamber tube in the form of a bundle flow, the cross-sectional area of which is smaller than the cross-sectional area of the combustion chamber tube and the flow velocity of which is considered asymmetrical across the cross-section of the bundle flow and in one Cross-sectional half predominantly has flow components at a higher speed than in the other half.
- a heating oil burner suitable for solving the task with a fuel atomizing nozzle, an arrangement for generating a flow of a mixture of finely divided fuel and combustion air, a guiding device for introducing the flow mixture into a combustion chamber and a device for igniting the mixture is characterized in that the guiding device comprises a combustion chamber tube extending into the respective combustion chamber, to which the fuel mixture is fed via a nozzle on the nozzle side smaller diameter than the combustion chamber tube having the combustion head tube is supplied, which, due to the design, differently delays the mixture flow supplied at a predetermined speed and passing through the combustion head tube over its circumference, in particular in the region of one half of the circumference.
- this flow configuration greatly favors the backflow effect of not yet completely burned-out fuel gases from the combustion chamber back into the flame area due to the associated vacuum formation, which in turn leads to a further increase in efficiency.
- the bundle flow is preferably guided essentially horizontally, the flow components being present at at least predominantly higher speed in the upper half of the bundle flow with respect to the horizontal, so that the bundle flow is in its
- Axial direction is directed downwards with respect to the horizontal over the axis of the combustion chamber tube, whereby the desired and desired flame insertion towards the center of the flame is further favored.
- This beveled design results in different flow conditions in the combustion chamber tube for the flow bundle, which leads to a different delay and, as a result, results in an asymmetrical distribution of the flow velocity components across the cross section of the flow bundle. This asymmetrical speed distribution is, in turn, a major reason why the desired, rotating flame is achieved.
- a flame guide tube located within the combustion chamber tube is provided downstream of the combustion head tube, which has a predeterminable distance with respect to the combustion head tube, is shorter than the combustion chamber tube and has a smaller diameter in comparison thereto and preferably on its free one End is also beveled.
- the axially longer area of the flame guide tube forms an organ for influencing the extent of the fuel gas recirculation, which also applies to the combustion chamber tube which is preferably bevelled at its free end and is arranged in the combustion chamber.
- the return of fuel gases in the area of the combustion chamber tube adjoining the combustion head tube can also be via openings in the Combustion chamber tube take place, which can be formed distributed over the circumference of the combustion chamber tube in its initial area.
- the burner tube does not run coaxially with the combustion chamber tube, but that the burner tube is inclined slightly downward with respect to the horizontal, so that the axis of the burner tube and the axis of the combustion chamber tube form an angle in the range of approximately 10 ° include.
- the head part of the burner nozzle which is arranged directly adjacent to the burner head tube, in a rounded and preferably partially or hemispherical manner, the distance between this head part and the lower region of the burner head tube, i. the area with the greater wall length is minimized and is preferably about 1 to 3 mm.
- combustion chamber tube, combustion head tube and, if appropriate, flame guide tube are expediently designed as a structural unit and in particular as a retrofittable structural unit.
- a particularly advantageous embodiment of the invention also consists in that at least two combustion chamber tubes extending into the respective combustion chamber are provided, which can be switched on individually, in groups or together, in particular depending on the heat requirement.
- three symmetrically distributed combustion chamber tubes are provided, but this number does not constitute a restrictive indication. This embodiment makes it possible to achieve very significant heating oil savings.
- a common combustion air supply is provided, with each combustion head tube being assigned a controllable closure element which, when the nozzle is inactive, that is to say when the combustion chamber tube is not in operation, enables the
- Fig. 1 is a schematic axial sectional view of the main components of a heating oil burner designed according to the invention
- FIG. 8 shows a schematic representation of a preferred embodiment variant with a plurality of combustion chamber tubes assigned to a combustion chamber, and 9 shows an end view of the combustion chamber tubes in the arrangement according to FIG. 8.
- Fig. 1 shows a combustion chamber tube 2, which is arranged in a combustion chamber tube 2, which is identified by the general reference number 1, but is not otherwise shown in detail, and which has a combustion head tube 4 at its end associated with the burner nozzle 3 and which is located in the otherwise closed end wall 10 of the combustion chamber Combustion chamber tube 2 is supported.
- the air flow generated by the fan provided runs in the axial direction, the distance between the end wall 10 and the burner nozzle 3 which can be seen in the drawing being optimized in individual cases.
- the combustion chamber tube 2 is bevelled in the embodiment shown, the angle of the bevel being selectable and the size of this angle having to be determined with regard to the desired amount of the returning fuel gases, which is due to the negative pressure which forms during operation be returned to the beginning of the combustion chamber tube 2.
- the combustion chamber tube 2 can be provided with openings distributed over its circumference, preferably approximately at the level at which the combustion head tube 4 opens into the combustion chamber tube 2.
- the combustion head tube 4 is followed, within the combustion chamber tube 2, by a flame guide tube 5, which is also beveled at its free end, the beveling being essentially analogous to the beveling of the combustion chamber tube 2 at its free end, although this is not a generally applicable requirement.
- the combustion chamber tube 2, flame guide tube 5 and combustion head tube 6 are in this case aligned coaxially and arranged horizontally.
- the outside diameter of the combustion head tube 4 is smaller than the inside diameter of the flame guide tube 5, which has a predeterminable axial distance with respect to the combustion head tube 4, so that gases flowing back inside the combustion chamber tube 2 re-enter the flame guide tube 5 via the open area between the combustion head tube 4 and the flame guide tube 5 can.
- combustion gases can be recirculated within the combustion chamber 1 after exiting the combustion chamber tube 2 in the area between the combustion head tube 4 and the flame guide tube 5.
- the practical return of fuel gases which results in the formation of a blue combustion flame is a consequence of the flow velocities which are produced according to the invention and which are larger in the horizontally upper region in relation to the fuel gas or flame bundle and thus lead to the formation of a negative pressure in this region.
- the extent of the fuel gas recirculation can be predetermined by the combustion chamber tube 2, specifically by the choice of the final design of the outlet area of the combustion chamber tube, a hot spot 8 favoring the flame preparation being obtained at the end of the combustion chamber tube 2.
- FIGS. 2 to 6 Different configurations of the free end of the combustion chamber tube 2 are shown in FIGS. 2 to 6.
- an oblique section adjoins a straight section running approximately in the middle of the combustion chamber tube 2 at a predeterminable angle.
- the bevel contour 7 is formed in several steps.
- FIG. 5 shows a beveling contour 7, which is slightly curved in the upper half of the combustion chamber tube 2 and in particular slopes towards the end of the combustion chamber tube, while in the lower half of the combustion chamber tube 2 the beveling consists of a sequence of adjoining partial curvatures.
- FIG. 6 shows a particularly simple design, in which over a predeterminable length range of the combustion chamber tube 2 this combustion chamber tube 2 is essentially designed as a half tube, which then preferably changes directly into a solid tube at a predetermined distance from the free end.
- Fig. 7 shows a schematic representation of a top view of the open end of the combustion chamber tube 2 and the flame 11 forming therein and also outside of the combustion chamber tube 2, for which the screwing effect shown in the drawing is characteristic.
- This flame movement with centric swirling also results in the generation of negative pressure, which in turn is the cause of the back suction of the combustion gases and the resulting optimal evaporation of the fuel.
- bores 12 can be provided in the manner already explained, through which the sucked-back gases are again included in the combustion.
- Hollow-cone nozzles are preferably used as the nozzles 3, the distance between the nozzle 3 and the burner head tube 4 being adjustable to the respective optimum, if appropriate by experiments. It is also possible, instead of the arrangement of the burner head tube 4 and the flame guide tube 5 shown in FIGS. 1 to 6, in this case coaxial, with respect to the combustion chamber tube 2, an acute-angled course between the axis of the combustion chamber tube 2 and the preferably coaxially arranged burner head and flame guide tubes 4, 5 to choose.
- the diameter ratios of the combustion head tube 4, flame guide tube 5 and combustion chamber tube 2 are preferably selected so that the desired best possible fuel gas recirculation results in each case and complete use of fuel gas is ensured with minimal exhaust gas pollution.
- the design of a heating oil burner according to the invention also makes it possible to work with a lower oil pressure at the nozzle and also with a lower air pressure and still ensure stable operation of the burner.
- the oil pressure can be less than 10 atm and in some cases even reduced to about 5 atm, while the air pressure generated by a fan can be around 10 mbar.
- the above values do not represent any restrictive features, they only illustrate that, in comparison to conventional blue burners, both low oil pressure and low air pressure can be used and stable operation can be guaranteed. Fig.
- FIG. 8 shows a particularly advantageous embodiment according to the invention, in which, taking advantage of the fact that the system described above requires comparatively little oil and also a low air pressure for optimal function, the heating power is not generated with a single burner tube, but with several individual, correspondingly smaller sized combustion pipes is divided.
- several, in particular two or three, combustion chamber tubes 2 are assigned to one combustion chamber, in accordance with the schematic illustration in FIG. 8, these combustion chamber tubes being connectable individually, in groups or together, in particular depending on the heat requirement.
- a common burner air supply is provided for all combustion chamber tubes 2, each with an associated nozzle 3, which can also be regulated in particular as a function of the number of burner tubes that are in operation.
- each burner head tube 4 which is inclined downward with respect to the axis of the respective combustion chamber tube 2 by an angle ⁇ , which can preferably be in the range of approximately 10 °, is assigned a closure slide 13, which over an actuating device 14 is controlled such that the combustion head tube 4 is fully open when the combustion chamber tube is in operation and is fully closed when the combustion chamber tube is inactive.
- FIG. 9 shows the relative arrangement of the various combustion chamber tubes on the carrier surface assigned to them, to which an air guide chamber connects to the nozzles 3.
- the combustion system according to the invention In connection with the combustion system according to the invention, it generally has a favorable effect that, compared to the blue burners known from the prior art, the pressures required are around a third and the oil consumption is compared to. the conventional burning systems is reduced.
- the interaction of the specially designed and downwardly inclined combustion head tube 4 with the respectively assigned nozzle 3 ensures an optimal flame pattern, the radius of the partially spherical being preferred
- Head part of the nozzle 3 corresponds approximately to the radius of the burner head tube 4 assigned to the nozzle and arranged directly adjacent to it.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion Of Fluid Fuel (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004013434.0 | 2004-03-18 | ||
DE200410013434 DE102004013434B4 (de) | 2004-03-18 | 2004-03-18 | Verfahren und Heizölbrenner zur Optimierung des Verbrennungsvorgangs |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005093322A1 true WO2005093322A1 (de) | 2005-10-06 |
Family
ID=34961130
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2005/002549 WO2005093322A1 (de) | 2004-03-18 | 2005-03-10 | Verfahren und heizölbrenner zur optimierung des verbrennungsvorgangs |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE102004013434B4 (de) |
WO (1) | WO2005093322A1 (de) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2796923A (en) * | 1953-03-11 | 1957-06-25 | Nat Fuel Conservation Co Inc | Oil-burner and combustion head construction and installation |
DE2821932A1 (de) * | 1978-05-19 | 1979-11-22 | Karl Bodemer | Mischeinrichtung zur verbrennung von fluessigen kohlenwasserstoffen, insbesondere heizoel und dieseloel |
DE4238529A1 (de) * | 1992-11-14 | 1994-05-19 | Deutsche Forsch Luft Raumfahrt | Brenner zur Heißgaserzeugung |
DE19626766A1 (de) * | 1996-07-03 | 1997-02-27 | Heinrich Dr Ing Koehne | Mischeinrichtung für flüssige, gas- und/oder staubförmige Brennstoffe |
DE20203768U1 (de) * | 2001-03-17 | 2002-06-27 | Giersch Gmbh | Brenner |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4440716C2 (de) * | 1994-11-15 | 1997-02-27 | Daimler Benz Ag | Rußfilteranlage für Verbrennungsmotor |
-
2004
- 2004-03-18 DE DE200410013434 patent/DE102004013434B4/de not_active Expired - Fee Related
-
2005
- 2005-03-10 WO PCT/EP2005/002549 patent/WO2005093322A1/de active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2796923A (en) * | 1953-03-11 | 1957-06-25 | Nat Fuel Conservation Co Inc | Oil-burner and combustion head construction and installation |
DE2821932A1 (de) * | 1978-05-19 | 1979-11-22 | Karl Bodemer | Mischeinrichtung zur verbrennung von fluessigen kohlenwasserstoffen, insbesondere heizoel und dieseloel |
DE4238529A1 (de) * | 1992-11-14 | 1994-05-19 | Deutsche Forsch Luft Raumfahrt | Brenner zur Heißgaserzeugung |
DE19626766A1 (de) * | 1996-07-03 | 1997-02-27 | Heinrich Dr Ing Koehne | Mischeinrichtung für flüssige, gas- und/oder staubförmige Brennstoffe |
DE20203768U1 (de) * | 2001-03-17 | 2002-06-27 | Giersch Gmbh | Brenner |
Also Published As
Publication number | Publication date |
---|---|
DE102004013434B4 (de) | 2008-04-17 |
DE102004013434A1 (de) | 2005-10-06 |
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