EP1597516A1 - Systeme pour amener de l'air de combustion et du combustible liquide dans un bruleur - Google Patents

Systeme pour amener de l'air de combustion et du combustible liquide dans un bruleur

Info

Publication number
EP1597516A1
EP1597516A1 EP03722202A EP03722202A EP1597516A1 EP 1597516 A1 EP1597516 A1 EP 1597516A1 EP 03722202 A EP03722202 A EP 03722202A EP 03722202 A EP03722202 A EP 03722202A EP 1597516 A1 EP1597516 A1 EP 1597516A1
Authority
EP
European Patent Office
Prior art keywords
fuel
needle
combustion air
fuel needle
burner
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Withdrawn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
EP03722202A
Other languages
German (de)
English (en)
Inventor
Christian Bäcker
Felix Wolf
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.)
Webasto SE
Original Assignee
Webasto SE
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 Webasto SE filed Critical Webasto SE
Publication of EP1597516A1 publication Critical patent/EP1597516A1/fr
Withdrawn legal-status Critical Current

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
    • F23D11/38—Nozzles; Cleaning devices therefor
    • 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
    • F23D11/10—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour
    • F23D11/101—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour medium and fuel meeting before the burner outlet
    • F23D11/102—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour medium and fuel meeting before the burner outlet in an internal mixing chamber

Definitions

  • the invention relates to a system for supplying combustion air and liquid fuel into a burner with a Venturi nozzle for supplying the combustion air and a fuel needle arranged in the combustion air flow area for supplying the liquid fuel.
  • Generic systems can be used, for example, for burners in vehicle heaters.
  • Vehicle heaters of this type are used, for example, as additional heaters or as auxiliary heaters.
  • Venturi nozzle The effect of the Venturi nozzle is used to atomize the fuel emerging from the fuel needle, so that a mixture of combustion air and atomized fuel can be fed to the combustion chamber of the burner.
  • the fuel needle represents an obstacle to the air flow.
  • the fuel needle In order to counteract the increase in the flow resistance through the fuel needle, it is possible to enlarge the cross section of the generally cylindrical region of the Venturi nozzle.
  • This has the consequence that a larger overall space is required for the feed device.
  • the invention is based on the object of providing a system for supplying combustion air and liquid fuel to a burner while circumventing the disadvantages described, it being possible, in particular, to work without an undesired pressure drop over the flow path of the combustion air, and furthermore an undesirable one Enlargement of the required space is avoided.
  • the invention is based on the generic system in that the fuel needle applies to the ratio of inner diameter di to outer diameter d a :
  • the fuel needle is therefore designed to be extremely thin-walled, so that the smallest possible outer diameter is ensured with a given fuel throughput, that is to say a given inner diameter. Ultimately, this leads to a particularly low flow obstacle due to the presence of the needle.
  • the specified tolerance range is selected such that the needle can still be manufactured without major difficulties, the principle underlying the present invention being fulfilled the better the closer the ratio of the inside diameter to the outside diameter of the fuel needle approaches the value 1 ,
  • the system according to the invention is further developed in that the Venturi nozzle is axially symmetrical and in that the fuel needle is aligned axially. Due to the axial alignment of the fuel needle, it offers low flow resistance for the combustion air. However, one is tends to introduce the fuel at a certain angle into the flow area of the Venturi nozzle, it is also possible to tilt the fuel needle against the axis of the Venturi nozzle. In this case, too, the indicated useful ratio between inner diameter and outer diameter contributes to minimizing the flow resistance.
  • combustion air means all or part of the combustion air that is used to atomize the fuel.
  • the exit plane of the liquid fuel from the fuel needle is perpendicular to the direction of flow of the liquid fuel through the fuel needle. In this way, neglecting gravity results in an axially symmetrical exit of the fuel from the fuel needle.
  • the exit plane of the liquid fuel from the fuel needle extends obliquely to the direction of flow of the liquid fuel through the fuel needle.
  • a preferred direction when the fuel emerges from the fuel needle can be realized without tilting the fuel needle as a whole against the axis of the Venturi nozzle.
  • the oblique cut of the fuel needle in the outlet area thus avoids an increase in the flow resistance due to the tilted fuel needle, although it is still possible for the fuel to emerge from the fuel needle, for example against gravity.
  • the outlet opening of the fuel needle is provided with tips and / or crenellations. This enables the fuel to be introduced into the combustion chamber over a large radial extent, which is sometimes not optimally achievable in openings without a structure at the edge of the outlet due to constriction effects.
  • the system according to the invention is further developed in a preferred manner in that the venturi nozzle has an essentially cylindrical part which has a transition to a part which changes in cross section, in that the outlet opening of the fuel needle is arranged in the essentially cylindrical part of the venturi nozzle and that there is an axial distance between the outlet opening of the fuel needle and the transition.
  • the system according to the invention is developed with particular advantages in that, with regard to the at least one installation position of the burner in a motor vehicle, it is designed such that the opening of the fuel needle is above the axis of the Venturi nozzle. In this way it is possible to arrange the fuel needle parallel to the axis of the Venturi nozzle and at the same time to counteract a gravitational effect.
  • the installation position of the fuel needle with respect to the valve nozzle axis is selected such that it is displaced radially upward from the axis and then still in the circumferential direction, then two installation positions of the burner can be permitted, the favorable position in both installation positions Gravity is compensated by the position of the opening above the axis of the Venturi nozzle.
  • the invention is based on the knowledge that a particularly thin-walled fuel needle can have positive effects on the construction and flow behavior of a fuel supply device with a Venturi nozzle and a fuel needle.
  • the outside diameter is as small as possible enables so that the flow behavior of the combustion air is minimally influenced.
  • DE 100 39 152 A1 discloses a heater with an atomizer burner, in particular for use in a motor vehicle auxiliary heater, and an atomizer nozzle for processing the fuel, an ignition device and a combustion chamber in which an air-guiding device is connected upstream of a nozzle assembly of the atomizer nozzle is which impinges a swirl on the combustion air flowing into the atomizer nozzle.
  • Another object is to provide a heater for mobile applications, within which combustion processes take place in a stable manner and whose installation space is further reduced compared to heaters known from the prior art.
  • the heating device according to the invention advantageously has the advantages illustrated in connection with the system according to the invention for supplying combustion air and liquid fuel.
  • Figure 1 is a schematic representation of a system according to the invention
  • Figure 2 is a sectional view taken along the II marked in Figure 1
  • FIG. 3 shows a fuel needle with a first outlet opening for use in a system according to the invention
  • FIG. 4 shows a fuel needle with a second outlet opening for use in a system according to the invention
  • FIG. 5 shows a fuel needle with a third outlet opening for use in a system according to the invention
  • FIG. 6 shows a variant of FIG. 4
  • FIG. 7 shows a heating device according to the invention in a partially sectioned view, which has the system according to the invention.
  • FIG. 1 shows a schematic representation of a system according to the invention.
  • the system serves to mix combustion air 10 with liquid fuel 12, this mixture ultimately being to be fed to the burner 14 of a vehicle heater.
  • the system comprises a Venturi nozzle 16, which in the most general case means a tube with a constriction.
  • the constriction of the Venturi nozzle is formed by a cylindrical part 26. This is followed by a part with an increasing cross section 28. Due to the fluid mechanics, the incoming combustion air 10 assumes a high flow velocity in the narrowed cylindrical area 26 of the Venturi nozzle 16.
  • a fuel needle 18 for supplying the fuel 12 is arranged in this cylindrical part 26 of the Venturi nozzle 16.
  • the fuel needle 18 makes sense to arrange the fuel needle 18 in precisely this narrowed cylindrical region 26 of the Venturi nozzle 16, since the combustion air 10 flowing at high flow speed favors the atomization of the fuel.
  • the fuel needle 18 also represents a flow obstacle for the incoming combustion air 10.
  • FIG. 2 shows a sectional view along the plane marked II in FIG. 1. It can be seen how the present invention solves the problem described in connection with FIG. 1.
  • the fuel needle By choosing the ratio between the inside diameter dj and outside diameter d a of the fuel needle 18 as close as possible to the value 1, the fuel needle provides a minimal len flow resistance for the incoming combustion air in the Venturi nozzle 16.
  • FIG. 3 shows a fuel needle 18 with a first outlet opening for use in a system according to the invention.
  • the exit plane 20 of the fuel from the fuel needle 18 is perpendicular to the main direction of flow of the fuel 12. This results in a constriction of the fuel 12 outside the fuel needle, sometimes with a view to a homogeneous distribution of the fuel in the Venturi nozzle and ultimately in the Combustion chamber can be disadvantageous.
  • FIG. 4 shows a fuel needle 18 with a second outlet opening for use in a system according to the invention.
  • the outlet opening of the fuel needle 18 has battlements 24. These battlements bundle the emerging fuel 12 in certain areas, and ultimately it is achieved that the fuel is distributed almost homogeneously over the entire flow cross-section available to it.
  • FIG. 5 shows a fuel needle 18 with a third outlet opening for use in a system according to the invention.
  • a fuel needle 18 with a beveled exit plane 22 can be seen here. This gives the outflowing fuel 12 a preferred direction so that, for example, a gravitational effect can be counteracted. If such a fuel needle 18 is rotatably mounted in the Venturi nozzle 16, it can be aligned and fixed accordingly after the heater has been installed in order to compensate for the force of gravity.
  • FIG. 6 shows a variant of FIG. 4, in which the outlet opening of the fuel needle 18 has tips 25 instead of the rectangular pinnacles 24.
  • the effect of bundling the fuel 12 is similar, with additional mixing or swirling of the fuel being achieved.
  • the battlements 24 and / or the tips 25, mixed forms also being possible, can be used both with a vertical exit plane 20 and with an inclined exit plane 22.
  • FIG. 7 shows a partially sectioned schematic illustration of a heating device in which the present invention can be used.
  • a heater 110 is shown with a burner 14 for burning a fuel / air mixture.
  • the heating device comprises an annular duct blower 114 with a blower motor 36.
  • the annular duct blower 114 draws combustion air 10 through an air inlet connection 116 and blows it into a combustion air plenum 118 on the pressure side.
  • the combustion air available in the combustion air collecting space 118 is divided into primary air and secondary air.
  • the primary air is conveyed into the combustion chamber 124 through a nozzle 16, which in the present example is designed as a Venturi nozzle.
  • the secondary air is conveyed into the combustion chamber 124 through secondary air bores 122.
  • the division of the combustion air into primary air and secondary air is useful in order to provide a rich, ignitable mixture at the outlet of the nozzle 16.
  • the nozzle 16 includes a settling zone 126 and a diffuser 130 to provide the venturi effect.
  • the fuel needle 18 described above is arranged within the nozzle 16.
  • the fuel needle 18 is supplied with fuel 44 via a fuel line 82. Due to the high flow velocity of the combustion air in the calming zone 126, the fuel emerging from the fuel needle 18 with almost no pressure is drawn into threads which then disintegrate into droplets. The high air velocities required for good atomization can be achieved by good pressure recovery of the diffuser 130.
  • the flow rate of the fuel / air mixture is drastically reduced in the course of the diffuser 130, as a result of which low flow rates are achieved in the area of a glow plug which is not shown here but is known from DE 100 39 152 A1 - to which reference is hereby made in full.
  • the glow plug is switched off. It can subsequently be used for flame monitoring using a resistance measurement.
  • a baffle plate 132 is arranged within the combustion chamber 124. This represents a flow obstacle, so that the air emerging from the nozzle 16 is forced outwards. This results in a good mixing of the primary air with the secondary air, which is useful in terms of good burnout.
  • the region between the nozzle 16 and the baffle plate 132 thus serves as a mixing zone 134, and the region beyond the baffle plate 132, that is to say the region lying downstream with respect to the baffle plate 132, serves as the reaction zone 138.
  • the mixture produced burns in the further course of the combustion tube 140 and is passed through the exhaust gas-carrying parts from the heater 110.
  • the generated heat heats up cold water 146 in the heat exchange with the exhaust gas-carrying parts, so that warm water 148 emerges from the heater 110.
  • Air for example, can also be used as the heat transfer medium.
  • exit plane of the fuel perpendicular to the longitudinal axis of 16
  • exit plane of the fuel oblique to the longitudinal axis of 16

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Spray-Type Burners (AREA)
  • Nozzles For Spraying Of Liquid Fuel (AREA)

Abstract

L'invention concerne un système servant à amener de l'air de combustion (10) et du combustible liquide (12) dans un brûleur (14) et comprenant un tube de Venturi (16) pour amener l'air de combustion (10) et une aiguille à combustible (18) placée dans la zone d'écoulement de l'air de combustion et servant à amener le combustible liquide (12). L'invention est caractérisée en ce que le rapport du diamètre intérieur di au diamètre extérieur da de l'aiguille à combustible (18) est compris dans la plage 0,7 = di/da < 1. L'invention concerne également un appareil de chauffage comprenant un système selon l'invention.
EP03722202A 2003-02-28 2003-02-28 Systeme pour amener de l'air de combustion et du combustible liquide dans un bruleur Withdrawn EP1597516A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE2003/000665 WO2004076923A1 (fr) 2003-02-28 2003-02-28 Systeme pour amener de l'air de combustion et du combustible liquide dans un bruleur

Publications (1)

Publication Number Publication Date
EP1597516A1 true EP1597516A1 (fr) 2005-11-23

Family

ID=32913723

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03722202A Withdrawn EP1597516A1 (fr) 2003-02-28 2003-02-28 Systeme pour amener de l'air de combustion et du combustible liquide dans un bruleur

Country Status (4)

Country Link
EP (1) EP1597516A1 (fr)
AU (1) AU2003229483A1 (fr)
DE (1) DE10394235D2 (fr)
WO (1) WO2004076923A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6793487B2 (en) * 2000-03-24 2004-09-21 Webasto Thermosysteme International Gmbh Binary burner with Venturi tube fuel atomization and Venturi jets for the atomization of liquid fuel
EP1158814B1 (fr) * 2000-05-26 2008-03-26 Nokia Siemens Networks Gmbh & Co. Kg Méthode pour le contrôle de destinations dans un réseau intelligent
DE10039152A1 (de) 2000-08-06 2002-02-14 Webasto Thermosysteme Gmbh Zerstäuberbrenner

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004076923A1 *

Also Published As

Publication number Publication date
AU2003229483A1 (en) 2004-09-17
WO2004076923A1 (fr) 2004-09-10
DE10394235D2 (de) 2006-01-19

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