EP1653153A1 - Tube foyer pour un brûleur à gaz chauds et procédé de fabrication d'un tel tube - Google Patents

Tube foyer pour un brûleur à gaz chauds et procédé de fabrication d'un tel tube Download PDF

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Publication number
EP1653153A1
EP1653153A1 EP04025624A EP04025624A EP1653153A1 EP 1653153 A1 EP1653153 A1 EP 1653153A1 EP 04025624 A EP04025624 A EP 04025624A EP 04025624 A EP04025624 A EP 04025624A EP 1653153 A1 EP1653153 A1 EP 1653153A1
Authority
EP
European Patent Office
Prior art keywords
flame tube
hollow body
lateral surface
branch pipes
flame
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.)
Granted
Application number
EP04025624A
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German (de)
English (en)
Other versions
EP1653153B1 (fr
Inventor
Merz Erwin
Böhm Michael
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.)
Kaercher Futuretech GmbH
Original Assignee
Kaercher Futuretech GmbH
Alfred Kaercher SE and Co KG
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 Kaercher Futuretech GmbH, Alfred Kaercher SE and Co KG filed Critical Kaercher Futuretech GmbH
Priority to EP04025624A priority Critical patent/EP1653153B1/fr
Priority to ES04025624T priority patent/ES2379548T3/es
Priority to AT04025624T priority patent/ATE543046T1/de
Priority to DE202005013430U priority patent/DE202005013430U1/de
Priority to CA002524136A priority patent/CA2524136A1/fr
Priority to US11/261,069 priority patent/US20060093981A1/en
Publication of EP1653153A1 publication Critical patent/EP1653153A1/fr
Application granted granted Critical
Publication of EP1653153B1 publication Critical patent/EP1653153B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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

Definitions

  • the present invention relates to a flame tube for a burner for hot gas production, comprising a hollow body which forms an at least partially enclosed combustion chamber, wherein the hollow body has a first end, which is designed for connection to a flame-generating unit, and wherein the hollow body has a jacket surface the at least one branch pipe is arranged.
  • Such a flame tube and such a method are known for example from DE 42 44 400 A1.
  • the applicant distributes flame tubes of the aforementioned type already together with mobile field kitchens and mobile cooking modules for such field kitchens.
  • Mobile kitchen kitchens are needed above all when a large number of people have to be cared for away from civilization over an extended period of time.
  • Classic applications are military exercises or deployments of larger groups of troops, but also humanitarian applications, such as disaster relief in an earthquake area.
  • the field kitchens must be mobile and above all robust for such applications. This means that the field kitchens can be transported, set up and operated even under strongly changing requirements and difficult conditions. For example, a transport on a vehicle even in rough terrain must be possible, what appropriate Impacts and mechanical loads can result.
  • the mobile field kitchens must work reliably both in hot environments, for example in the desert, and in very cold environments, such as in winter in high mountains.
  • the present Applicant sells such field kitchens and cooking modules for such applications.
  • diesel or multi-fuel burners are used to heat the cooking zones.
  • the burners must be able to operate with fuels of varying quality and, moreover, enable reliable operation under the aforementioned conditions.
  • a high heat output is needed to heat large cooking areas for the preparation of large quantities of food.
  • the branch pipes are used for discharging the hot gas (flue gas) generated in the hollow body, and they are arranged so that the outflowing hot gas heats a surrounding air volume and / or a cooking plate, a grill plate, a water bath or the like.
  • the flame tubes used so far have a limited service life or service life, especially when used under changing, harsh conditions. It has been shown that the guided through the branch pipes hot gas around the branch pipes leads to a scaling up to a complete material dissolution. After a long period of operation of the previously used flame tubes, holes are formed around the branch pipes and in some cases, branch pipes fall downwards into the flame tube. In addition, the production of flame tubes used so far is relatively complex and therefore expensive, since 15 branch pipes had to be welded individually to the lateral surface of the hollow body.
  • a burner with a flame tube is known, whose lateral surface is penetrated by branch pipes.
  • the branch pipes are not used in this case for the discharge of flue gas from the combustion chamber of the hollow body, but on the contrary to the renewed feeding (recycling) of flue gas, which has already leaked out of the flame tube.
  • This recirculation of flue gas is called recirculation and it serves to reduce the nitrogen oxide emission of the burner by returning the flue gas to the combustion process.
  • the branch pipes in the burner from DE 42 44 400 A1 are thus not flowed through by the hot flue gas from the inside to the outside, but it flows cooled flue gas from the outside back into the combustion chamber. Problems with scaling and material shrinkage in the field of branch pipes are not described in DE 42 44 400 A1.
  • a flame tube of the type mentioned in which the branch pipe is connected on its outer side with an intermediate piece and in which the intermediate piece is fixed to the lateral surface.
  • the intermediate piece is welded to the lateral surface.
  • the present invention is based on the idea that at least one branch pipe - at least in addition - to attach via an intermediate piece on the lateral surface of the hollow body. Characterized in that the intermediate piece is connected to the branch pipe on the outside thereof, the intermediate piece is not in direct contact with the hot flue gas in the interior of the hollow body. If the flue gas can reach the intermediate piece at all, which depends on the geometry of the branch pipes and the spatial conditions around the flame tube around, it has already cooled compared to the temperatures which the hot flue gas has in the interior of the hollow body.
  • the very hot flue gas from the interior of the hollow body does not flow with its high kinetic energy past the intermediate piece. Overall, the intermediate piece is therefore exposed to a lower energetic load than the branch pipe itself.
  • the new flame tube in which the branch pipes are fastened to the jacket surface via said intermediate piece, has a considerably longer service life, the end of which is not yet foreseeable in Applicants' current tests.
  • branch pipes can be very easily attached due to the new spacers in different angles of inclination and at almost any point of the hollow body, so that the heat distribution of the new heating tube can be flexibly optimized.
  • the branch pipe and the intermediate piece are formed in two parts, wherein the branch pipe and the intermediate piece are preferably welded together.
  • branch pipe and intermediate piece is - as well as the welding of spacer and lateral surface - preferred because can be produced in a very cost-effective manner very robust and suitable for the application described above flame tubes with this joining process.
  • the branch pipe is attached only via the intermediate piece on the lateral surface.
  • the preferred embodiment has the advantage that no joint lies in the immediate region of the hot gas stream, that is, the material which is directly exposed to the hot gas stream experiences no "pre-damage". The risk that in the region of the joint between branch pipe and lateral surface a material shrinkage occurs, is thus further reduced. The service life of the new flame tube is even higher.
  • the branch pipe is placed flush from the outside on the lateral surface.
  • the branch pipe does not protrude into the interior space (combustion chamber) of the hollow body.
  • the embodiment has the advantage that there are no material-weak edges and projections in the immediate area of influence of the flame and the hot gases flowing in the combustion chamber. The risk of a material transfer and the associated limitation of the useful life are further reduced.
  • this design also contributes to a simpler and more cost-effective production with consistent manufacturing quality.
  • the lateral surface below the branch pipe has an opening with a first inner diameter and the branch pipe has a second inner diameter, wherein the second inner diameter is greater than the first inner diameter.
  • This embodiment contributes to a further simplification of the production of the new flame tube, since the branch pipe in this embodiment is easy on the lateral surface from the outside can be put on. Moreover, this embodiment further reduces the risk of material removal on or around the branch pipe.
  • the intermediate piece is an angle piece with at least two, preferably three legs, which surround the branch pipe.
  • a very stable attachment of the branch pipe is achieved on the lateral surface, in particular when the branch pipe has no or at most a slight, provisional attachment to the lateral surface.
  • the stability is particularly advantageous for the rough mobile use of the new flame tube.
  • the attachment of the branch pipe or tubes in this embodiment can be carried out very easily with a consistently high quality standard.
  • the circumferential surface in the circumferential direction has a first and a second half and only on the first half a plurality of branch pipes are attached.
  • This embodiment is particularly advantageous for the use of the new flame tube as a heat source for mobile field kitchens and the like, since the new flame tube hot flue gas can flow out here with a defined preferred direction.
  • this makes it possible to heat a cooking plate, grill plate or the like located directly above the branch pipes very efficiently.
  • the second half is completely closed.
  • this embodiment allows to use the second half of the flame tube without special insulation or sealing in a burner for a mobile field kitchen. This heat can be radiated over the second half, which avoids excessive thermal stress on the material in the second half and therefore also contributes to an extension of the useful life of the new flame tube.
  • the at least one branch pipe is a hot gas outlet.
  • This embodiment is based on the already described use of the flame tube for heating hot plates, grill plates and the like. Especially with this use, the advantages of the invention come particularly to advantage.
  • the use of the branch pipe as a hot gas outlet allows a very efficient heating even of large-scale cooking zones, such as These are needed for the meals of many persons. Especially in such applications, the problems described above occur as a result of the high energy load of the branch pipe.
  • the present invention can also be used advantageously in branch pipes in which the branch pipes serve for recirculation, that is to say for returning partially cooled flue gas into the combustion chamber.
  • the hollow body has a second end which is at least largely closed.
  • This refinement is also particularly advantageous if the new flame tube is to be used for heating hotplates, grill plates and the like in a mobile field kitchen.
  • the closure of the hollow body at the second end of the hot gas outlet is concentrated on the or the branch pipes, which allows a particularly efficient heating of large cooking areas.
  • the new flame tube has at least four branch pipes, which are arranged on one half of the lateral surface so that they open in a plan view of the half approximately a rectangle.
  • exactly four branch pipes are provided.
  • the four branch pipes include two first branch pipes located closer to the first end and two second branch pipes farther from the first end, the two first branch pipes being inclined toward the first end while the first branch pipes are inclined two second branch pipes are inclined away from the first end.
  • This embodiment also contributes to an optimal heat distribution when the new flame tube is used for heating a large, rectangular cooking area.
  • the rearward inclination of the two first branch pipes has the consequence that the hot gas flowing through undergoes a deflection of more than 90 °.
  • the hot gas flows from the combustion chamber with a much lower deflection through the two second branch pipes. It has been found that in this embodiment about 60% of the hot flue gas flows through the second branch pipes while only about 40% of the hot flue gas flows through the first branch pipes.
  • this unequal distribution will compensated by the fact that in the rear region of the flame tube, a higher radiant heat occurs as a result of the flame generating unit arranged there.
  • this preferred embodiment leads to an excellent heat distribution on a large hob, while on the other hand, the production costs compared to the previously used flame tube are significantly reduced. In addition, it has been shown that by the tendency strain forces are well derived and still a stable fit of the branch pipes is achieved.
  • a burner with an exemplary embodiment of the new flame tube is denoted by the reference numeral 10 in its entirety.
  • the burner 10 is here a so-called push-in burner, which can be inserted in the position shown in Figure 1 from left to right in a cooking module (not shown here), as offered by the assignee of the present invention under the name BFK.
  • the new flame tube is designated in its entirety by the reference numeral 12.
  • the flame tube 12 has a hollow body 14, which is cylindrical here. This is manufacturing technology and in terms of heat distribution advantage.
  • the invention is but not limited thereto and can equally be used in differently shaped hollow bodies for flame tubes.
  • the flame tube 12 has in the region of its second end 27 four branch pipes, of which only the branch pipes 28 and 30 are visible in FIG. Two further branch pipes are in a mirror-image arrangement on the not visible in Figure 1 side of the flame tube 12, as can be seen from Figure 2. There, the mirror images of each other lying branch tubes at the end of the flame tube 12 are designated by the reference numerals 28a and 28b.
  • the branch pipes 28, 30 are attached to the lateral surface 34 of the hollow body 14 by means of intermediate pieces 32. Furthermore, they are arranged such that they are inclined with respect to the longitudinal central axis 36 of the hollow body 14, wherein the two end-side flame tubes 28 a, 28 b are inclined away from the flame-generating unit 18, while the branch tubes 30 (see Fig. 4) are inclined to the flame-generating unit 18. In all cases, the angle of inclination here is in each case 45 ° with respect to the longitudinal central axis 36 of the hollow body 14.
  • the second end 27 of the hollow body 14 is closed here. Furthermore, the lateral surface 34 is circumferentially closed here, so that the branch pipes 28, 30 represent the only outlets for flue gas or hot gas from the interior of the hollow body 14.
  • the branch pipes 28, 30 thus act as outlet nozzles, from which a hot gas stream emerges upwards. This hot gas stream is used in the cooking modules (not shown here) of the applicant to heat a cooking area (also not shown here), such as a cooking or grill plate.
  • each intermediate piece 32 is designed as angle pieces with a U-shaped profile in plan view (see FIG. 4).
  • each intermediate piece 32 has a triangular profile, which is adapted to the desired angle of inclination of the branch pipes 28, 30.
  • the flame tube 12 is arranged in the burner 10 in a trapezoidal trough 38 ( Figure 2).
  • the trough 38 is completed with an inserted metal sheet 40.
  • Below the trough 38 is located at the burner 10, an insulating layer 42 of heat-insulating ceramic material. Due to the new construction of the flame tube 12, however, the insulating layer 42 can also be dispensed with in the future, and instead only a radiation protection plate can be used, as shown in FIG.
  • the new flame tube 12 is shown below a hotplate 50, as is the case with the intended use in the burner 10.
  • the new flame tube can also be used in other environments, for example in combustion chambers, from which hot gas is supplied to a "consumer" via a pipeline system.
  • An example of this are ovens, in which the hot gas emerging from the flame tube 12 is passed through a heat exchanger.
  • the new flame tube is not limited to applications in mobile field kitchens, but it can be used anywhere where a hot gas flow is to be generated by means of a burner.
  • the branch pipes 28, 30 are here placed flush on the outer surface 34 of the hollow body 14 from the outside.
  • Each branch tube 28, 30 has an inner diameter D which is slightly larger than the inner diameter d of an opening 58 located below the branch tubes 28, 30 in the lateral surface 34.
  • the branch tubes 28, 30 can thus be easily placed on the lateral surface 34.
  • the branch tubes 28, 30 are then provisionally fixed to the lateral surface 34 with a small welding point or with a soldering or adhesive connection and then aligned with the desired angle of inclination with respect to the longitudinal central axis 36.
  • the final attachment of the branch pipes 28, 30 via the angular intermediate pieces 32 which are placed around the branch pipes 28, 30 around on the lateral surface 34 and then outside the branch pipes 28, 30 are welded to the lateral surface 34.
  • the branch pipes 28, 30 are also welded to the angle-shaped intermediate pieces 32, in order to achieve a stable attachment of the branch pipes 28, 30 on the lateral surface 34.
  • the welding points are each set so that no spot weld in the direct gas stream 54 is located.
  • the branch pipes 28, 30 are first welded to the angle-shaped intermediate pieces 32 and then the combination of branch pipe and intermediate piece on the lateral surface 34 of the hollow body 14 is positioned, aligned and also welded.
  • This second alternative has the advantage that the branch pipes 28, 30 can be fastened to the hollow body 14 without a "direct" fastening point.
  • the branch pipes 28, 30 may project into the combustion chamber 52 of the hollow body 14, as is known, for example, from the two publications DE 42 32 181 A1 and DE 42 44 400 A1 mentioned above is. It is understood that in this case the (inner) diameter D of the branch pipes 28, 30 must be smaller than the inner diameter d of the openings 58.
  • the intermediate pieces 32 are in the preferred embodiment shown here, two-angled sheet metal pieces with two triangular side panels 60 which are connected via a rectangular base 62. In plan view, this results in a U-shaped profile which surrounds the branch pipes 28, 30 (see FIG. 4).
  • the angular relationships of the triangular side parts 60 correspond to the desired angle of inclination of the branch pipes 28, 30 with respect to the longitudinal central axis 36 of the hollow body 14, as can be seen in FIG.
  • the spacers 32 may be formed differently in other embodiments of the invention, for example as V-shaped tabs, one leg of which is attached to a branch pipe 28, 30 and a second leg to the lateral surface 34 of the hollow body 14 (not shown here).
  • the intermediate pieces are connected to the outside of the branch pipes with these and that the intermediate pieces in turn fix the branch pipes on the lateral surface, so that the attachment points, in particular welds, does not flow directly from the hot gas be exiting from the combustion chamber 52 through the branch pipes.
  • the hollow body 14 here consists of two half-shells 68, 70, wherein only the upper half-shell 68 is provided with branch pipes 28, 30.
  • an approximately trapezoidal beveled radiation protection plate 72 is releasably attached to the lower half-shell 70.
  • the radiation protection plate 72 is provided with slots 74, engage with the hook 76 on the lateral surface 34 with play.
  • the four radiation tubes 28, 30 are arranged on the upper half-shell 68 in such a way that they form a rectangle 80 in plan view.
  • the branch pipes 28, 30 in the end portion 82 of the hollow body 14, that is, the branch pipes 28, 30 are closer to the second end 27 of the hollow body 14 as the first end 16, to which the flame generating unit 18 is connected.
  • both the hollow body 14 and the branch pipes 28, 30 and the intermediate pieces 32 are made of sheets having a thickness of 2 mm.
  • the comparatively large thickness of the sheet metal parts also contributes to an extension of the service life of the new flame tube.
  • the new flame tube 12 is particularly well suited for small, low combustion chambers in the described embodiment.
  • the described arrangement and distribution of the branch pipes allows a good heat distribution on flat surfaces and moreover, the new flame tube is very inexpensive and easy to manufacture.
  • the use of steel sheets and the attachment of the branch pipes over welds on the spacers to a very robust design, which also in mobile use and under changing operating conditions (Fuel quality, ambient temperatures, alternating operation, etc.) allows a reliable and long-lasting operation.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
EP04025624A 2004-10-28 2004-10-28 Tube foyer pour un brûleur à gaz chauds et procédé de fabrication d'un tel tube Not-in-force EP1653153B1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP04025624A EP1653153B1 (fr) 2004-10-28 2004-10-28 Tube foyer pour un brûleur à gaz chauds et procédé de fabrication d'un tel tube
ES04025624T ES2379548T3 (es) 2004-10-28 2004-10-28 Tubo de combustión para un quemador para generar gas caliente y procedimiento para la fabricación de dicho tubo
AT04025624T ATE543046T1 (de) 2004-10-28 2004-10-28 Flammrohr für einen brenner zur heissgaserzeugung sowie verfahren zum herstellen eines solchen flammrohrs
DE202005013430U DE202005013430U1 (de) 2004-10-28 2005-08-17 Flammrohr für einen Brenner zur Heißgaserzeugung
CA002524136A CA2524136A1 (fr) 2004-10-28 2005-10-25 Tube a flamme de bruleur pour la production de gaz chauds
US11/261,069 US20060093981A1 (en) 2004-10-28 2005-10-27 Flame tube for a burner for hot gas generation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04025624A EP1653153B1 (fr) 2004-10-28 2004-10-28 Tube foyer pour un brûleur à gaz chauds et procédé de fabrication d'un tel tube

Publications (2)

Publication Number Publication Date
EP1653153A1 true EP1653153A1 (fr) 2006-05-03
EP1653153B1 EP1653153B1 (fr) 2012-01-25

Family

ID=34927148

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04025624A Not-in-force EP1653153B1 (fr) 2004-10-28 2004-10-28 Tube foyer pour un brûleur à gaz chauds et procédé de fabrication d'un tel tube

Country Status (6)

Country Link
US (1) US20060093981A1 (fr)
EP (1) EP1653153B1 (fr)
AT (1) ATE543046T1 (fr)
CA (1) CA2524136A1 (fr)
DE (1) DE202005013430U1 (fr)
ES (1) ES2379548T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11261529B2 (en) * 2020-03-31 2022-03-01 Futuretech Capital, Inc. Reduced visibility conductive micro mesh touch sensor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4232181A1 (de) * 1992-09-25 1994-03-31 Man B & W Diesel Ag Brenner mit Stabilisatoren
DE4244400A1 (de) * 1992-12-29 1994-06-30 Deutsche Forsch Luft Raumfahrt Brenner zur Heißgaserzeugung
DE9321525U1 (de) * 1993-07-20 1999-01-28 Elco Klöckner Heiztechnik GmbH, 72379 Hechingen Brenner zur Verbrennung von flüssigen oder gasförmigen Brennstoffen in Feuerungsanlagen
DE20020441U1 (de) * 2000-12-01 2002-04-11 Viessmann Werke Kg Heizkessel-Brenner

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US721478A (en) * 1902-05-06 1903-02-24 John C Teller Apparatus for generating and burning gas.
US1221535A (en) * 1916-10-12 1917-04-03 Theodore A Holmberg Gas-burner.
US2216075A (en) * 1939-08-29 1940-09-24 James R Henderson Tobacco curing apparatus
US2340120A (en) * 1940-11-08 1944-01-25 Herbert L Grapp Pressure heating device
US2498263A (en) * 1947-08-23 1950-02-21 Daniel And Florence Guggenheim Ignition apparatus for combustion chambers using intermingled combustion liquids
US2826248A (en) * 1953-12-22 1958-03-11 Jay L Angel Internally fired gas burner
US2898978A (en) * 1956-02-20 1959-08-11 Lucas Rotax Ltd Gaseous fuel combustion apparatus
US3118489A (en) * 1960-12-01 1964-01-21 Union Carbide Corp Reverse flow jet burner with gas vortex flame holders
JP2905627B2 (ja) * 1991-08-13 1999-06-14 パロマ工業株式会社 パルス燃焼器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4232181A1 (de) * 1992-09-25 1994-03-31 Man B & W Diesel Ag Brenner mit Stabilisatoren
DE4244400A1 (de) * 1992-12-29 1994-06-30 Deutsche Forsch Luft Raumfahrt Brenner zur Heißgaserzeugung
DE9321525U1 (de) * 1993-07-20 1999-01-28 Elco Klöckner Heiztechnik GmbH, 72379 Hechingen Brenner zur Verbrennung von flüssigen oder gasförmigen Brennstoffen in Feuerungsanlagen
DE20020441U1 (de) * 2000-12-01 2002-04-11 Viessmann Werke Kg Heizkessel-Brenner

Also Published As

Publication number Publication date
US20060093981A1 (en) 2006-05-04
ATE543046T1 (de) 2012-02-15
EP1653153B1 (fr) 2012-01-25
ES2379548T3 (es) 2012-04-27
DE202005013430U1 (de) 2005-10-27
CA2524136A1 (fr) 2006-04-28

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