EP3997384B1 - Modularer brenner und ofen mit diesem brenner - Google Patents

Modularer brenner und ofen mit diesem brenner

Info

Publication number
EP3997384B1
EP3997384B1 EP20750708.8A EP20750708A EP3997384B1 EP 3997384 B1 EP3997384 B1 EP 3997384B1 EP 20750708 A EP20750708 A EP 20750708A EP 3997384 B1 EP3997384 B1 EP 3997384B1
Authority
EP
European Patent Office
Prior art keywords
burner
tube
combustion
distribution
fuel
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.)
Active
Application number
EP20750708.8A
Other languages
English (en)
French (fr)
Other versions
EP3997384C0 (de
EP3997384A1 (de
Inventor
Eric Rogemond
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.)
Eratec
Original Assignee
Eratec
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 Eratec filed Critical Eratec
Publication of EP3997384A1 publication Critical patent/EP3997384A1/de
Application granted granted Critical
Publication of EP3997384C0 publication Critical patent/EP3997384C0/de
Publication of EP3997384B1 publication Critical patent/EP3997384B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • 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 
    • F23C6/00—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
    • F23C6/02—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in parallel arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F23D14/10—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with elongated tubular burner head
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F23N1/027—Regulating fuel supply conjointly with air supply using mechanical means
    • 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 
    • F23C2201/00—Staged combustion
    • F23C2201/20—Burner staging
    • 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 
    • F23C2201/00—Staged combustion
    • F23C2201/30—Staged fuel supply
    • 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 
    • F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
    • F23C2900/06043—Burner staging, i.e. radially stratified flame core burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/101—Flame diffusing means characterised by surface shape
    • F23D2203/1017—Flame diffusing means characterised by surface shape curved
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/103—Flame diffusing means using screens
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/106—Assemblies of different layers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/14—Special features of gas burners
    • F23D2900/14041—Segmented or straight line assembly of burner bars
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/14—Special features of gas burners
    • F23D2900/14641—Special features of gas burners with gas distribution manifolds or bars provided with a plurality of nozzles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2237/00—Controlling
    • F23N2237/02—Controlling two or more burners

Definitions

  • the present invention relates to a burner and an oven comprising this burner.
  • Burners are combustion devices designed to produce heat by burning a mixture of fuel (classically a gas) and an oxidizer (usually air).
  • burners such as atmospheric burners, forced-air burners, or premix burners.
  • Premix burners are burners where air is mixed with gas in a premix chamber, with or without the aid of a fan, before being distributed onto the surface of a porous support where the flame develops.
  • the fibers are typically made of a fire-resistant alloy, for example Fecralloy® , configured to resist corrosion at temperatures exceeding 1000°C.
  • These metallic fibers can be woven to create a flexible textile capable of producing a wide variety of shapes.
  • the metallic textile is traditionally mounted on a steel casing containing distribution plates designed to ensure even combustion.
  • Porous support burners offer numerous advantages over other burners, such as homogeneous combustion with a wide modulation range. These burners allow for heat transfer either by radiation (infrared) or convection (blue flame), as well as an easy transition between these two modes of heat transfer. Furthermore, porous support burners offer high thermal efficiency with low emission levels (CO, NOx), low pressure drop, low thermal inertia, safety against flashback, and resistance to mechanical and thermal shock.
  • porous support burners in various fields such as drying or surface treatment of paints or coatings, heat treatment of technical textiles, or even for cooking food such as biscuits, pancakes, breads, brioches, etc., in agri-food ovens.
  • porous support burners can extend to a length of approximately 2 to 3 meters.
  • the width of this conveyor belt can exceed 4 to 8 meters. Therefore, there is a need for large burners.
  • Another drawback is the edge effect occurring at the sides of the oven.
  • the same amount of energy must be supplied across the entire width of the conveyor belt to ensure even cooking. Since the heat is lower at the sides of the oven due to energy absorption by its lateral walls, a large burner is needed to compensate for these edge effects.
  • US 4,543,940 refers to a burner according to the preamble of claim 1.
  • CN 204 213 927 U aims for a modularized flame treatment burner system device.
  • WO 2008/003869 aims for a tunnel oven, particularly for biscuit manufacturing.
  • the present invention aims to overcome all or part of these disadvantages by proposing a burner allowing a reduction in deflection, a reduction in size to reduce transport costs and facilitate assembly, and a homogeneous heat transfer over its entire length.
  • the present invention relates to a burner as defined by claim 1 and comprising a porous support and a combustion tube along which the porous support is mounted, the combustion tube having one or more openings to allow fuel to pass to the porous support, characterized in that the combustion tube is formed of a plurality of tubular modules assembled together and in that the burner further comprises at least one distribution tube extending inside the combustion tube to distribute the fuel in a predetermined manner in the combustion tube.
  • the burner according to the invention through its combustion tube formed by an assembly of modular sections, makes it possible to have a large burner while limiting the deflection and reducing the overall size. and transport costs.
  • the distribution tube allows for a homogeneous distribution of fuel within the combustion tube.
  • the opening(s) of the combustion tube are slots orthogonal to a longitudinal axis of the burner.
  • the burner has a feed module comprising sparking means and one or more sparking orifices arranged under the sparking means and configured to allow more fuel to pass through than a section of the same length of the combustion tube.
  • the burner includes fastening means configured to securely fix adjacent tubular modules.
  • the fastening means include fastening flanges bearing against each other.
  • This flange-to-flange contact between the support and the surface ensures an effective seal between two modules. It also helps to reduce deflection.
  • the fixing flanges support said at least one distribution tube inside the combustion tube.
  • the fastening means include calibrated leakage means allowing fuel to pass into the porous support at the junction of adjacent tubular modules.
  • calibrated leakage means can be formed by a notched portion of the mounting flanges.
  • the burner comprises several distribution tubes, including a primary distribution tube for distributing fuel into a first combustion zone formed by one or more tubular modules of the combustion tube, and at least one secondary distribution tube configured to distribute the fuel in a predetermined manner in a combustion zone downstream of the first combustion zone and formed by one or more other tubular modules of the combustion tube.
  • said at least one secondary distribution tube includes a blind portion extending at least through said first combustion zone.
  • both the primary distribution tube and said at least one secondary distribution tube have a perforated part having an upstream portion having a perforation area larger than a downstream portion.
  • This feature ensures flame continuity. It prevents a dark area from appearing at the beginning of the perforated section due to the fuel's propagation speed.
  • a larger perforation area on an upstream portion compared to a downstream portion of the perforated section of the distribution tube means that the total perforated surface area is greater than that of a downstream portion of the same length. Therefore, more fuel escapes through this upstream portion than through a downstream portion of the same length.
  • upstream and downstream are defined here in relation to the overall direction of fuel flow inside the burner.
  • the primary distribution tube and said at least one secondary distribution tube have a perforated part comprising distribution orifices arranged opposite the porous support.
  • This feature allows for better fuel distribution.
  • the fuel flow is not obstructed by the presence of the other distribution tube(s).
  • the primary distribution tube and said at least one secondary distribution tube have a terminal portion comprising an axial plug and a radial outlet opening.
  • the radial outlet is arranged opposite the porous support.
  • the terminal portion is arranged at a distance from a downstream end of the corresponding combustion zone, preferably at level of an upstream end of the last of the tubular modules forming said corresponding combustion zone.
  • This feature allows for a homogeneous distribution of fuel in the corresponding area of the combustion tube, avoiding an excess of fuel in the last tubular module of this area.
  • each distribution tube extends along only a part of the corresponding zone of the combustion tube.
  • each zone of the combustion tube is formed of several consecutive tubular modules, and the terminal portion extends into the last tubular module of the corresponding zone, near the upstream end of that tubular module, the terminal portion being preferably closer to the upstream end than to the downstream end of the last tubular module of the corresponding zone.
  • the burner includes adjustment means configured to independently regulate the fuel flow entering each distribution tube.
  • the invention also relates to an oven comprising a burner having the aforementioned characteristics.
  • the illustration shows a burner 1 according to an explanatory embodiment, but not according to the invention.
  • the burner 1 is intended to equip an oven, in particular a food processing oven.
  • the burner 1 extends longitudinally along an axis A, preferably over a length of at least 4 m, and which may be, for example, between 4 and 8 meters.
  • the burner 1 is therefore a large burner.
  • the burner 1 comprises a combustion tube 2 formed of several tubular modules 20, a distribution tube 4 arranged inside the combustion tube 2, and a porous support 6 supported by the combustion tube 2 and on the surface of which a premix of air and gas is intended to burn.
  • the burner 1 is advantageously a premixed surface combustion burner.
  • the porous support 6 is a fuel-permeable support, for example, a premix of gas and air.
  • the porous support 6 advantageously comprises metallic fibers, which can be woven so that the porous support 6 forms a flexible metallic fabric. These metallic fibers are made from a fire-resistant alloy, configured to resist corrosion at temperatures above 1000°C, such as Fecralloy® .
  • the porous support 6 selectively allows the use of either radiative (infrared) or convective (blue flame) heat transfer, and offers an easy transition between these two modes.
  • Radiative (infrared) heat transfer refers to a heat transfer with a power density on the order of 100 to 500 kW ⁇ m ⁇ 2 .
  • Convective (blue flame) heat transfer refers to a heat transfer with a power density on the order of 500 to 10,000 kW ⁇ m ⁇ 2 .
  • the combustion tube 2 extends longitudinally along axis A and supports the porous support 6.
  • the porous support 6 can be attached to the combustion tube 2 by spot welding (fusion of the fabric forming the porous support 6 with the combustion tube 2).
  • the porous support 6 therefore also extends longitudinally along axis A, specifically along the entire length of the combustion tube 2.
  • the combustion tube 2 is hollow and advantageously cylindrical.
  • the combustion tube 2 has an upstream end, connected and sealed by a feed module 8, and a downstream end, connected and sealed by a closure module 10.
  • the combustion tube 2 is perforated. As shown on the figure 2
  • the combustion tube 2 has, along its lateral wall, a plurality of combustion openings 22, which pass through and are arranged beneath the porous support 6 to allow fuel to flow from the inside of the combustion tube 2 to the porous support 6 where combustion takes place.
  • These openings 22 can be arranged longitudinally at regular intervals from each other. They have the form of slots orthogonal to the longitudinal axis A. For example, they are aligned along the axis A, as illustrated in the figure 2 .
  • the combustion tube 2 comprises a plurality of tubular modules 20 aligned and connected one after the other to form the combustion tube 2.
  • Each tubular module 20 thus constitutes a section of the combustion tube.
  • Each tubular module 20 supports a portion of the porous support 6.
  • each tubular module 20 includes through-holes, such as those illustrated in the figure 2 allowing the fuel to pass from the inside of the tubular module 20 to the porous support 6.
  • the 20 tubular modules are advantageously similar. In particular, they can be of equal length.
  • the combustion tube 2 comprises eight tubular modules 20. It could comprise fewer or more.
  • the combustion tube 2 comprises for example nine tubular modules 20.
  • the 20 tubular modules are joined end to end to form the combustion tube.
  • the burner 1 includes fastening means for rigidly and securely fixing the adjacent tubular modules 20.
  • These fastening means include, in particular, fixing flanges 24, intended to be pressed together in pairs, these flanges 24 being able to be held tightly against each other by screw-nut type clamping means.
  • each tubular module 20 comprises a first fixing flange 24 at an upstream end 20a of the tubular module 20, and a second fixing flange 24 at a downstream end.
  • the first fixing flange 24 of a tubular module 20 is intended to be fixed to the second fixing flange 24 of a preceding tubular module 20.
  • the flanges 24, possibly plate-shaped, have a flange projecting radially from the side wall of the tubular modules 20 and thus from the combustion tube.
  • the flanges 24 are, for example, orthogonal to the longitudinal axis A.
  • the mounting flanges 24 have an advantageously flat mounting face 240, designed to receive the mounting face of another mounting flange 24.
  • the mounting flanges 24 do not extend all the way around the combustion tube. They may, in fact, have a primary notch 242 allowing the passage of the porous support 6 at the junction of two adjacent tubular modules 20. As illustrated in the figure 4 (where the porous support 6 is not shown), the mounting flanges 24 may include one or more secondary notches 244 at the bottom of the primary notch 242, to allow gas to escape towards the porous support 6 at the junction of the tubular modules 20. This or these secondary notches 244 form calibrated leakage means, between the tubular module 20 and the porous support 6 on the one hand, and between two adjacent tubular modules 20 on the other. The calibrated leakage means are located below the porous support 6, to ensure flame continuity at the junction of two tubular modules 20.
  • the 24 fixing flanges extend not only outside the combustion tube 2, forming a collar, but also inside the combustion tube 2, forming a partition wall 246 preventing the passage of fuel located in the combustion tube 2 of a module tubular 20 to the other (except via calibrated leakage means), as illustrated on the figure 3
  • This partitioning allows for a more homogeneous distribution of the fuel along the burner 1.
  • the partition wall 246 extends in an annular manner around the distribution tube(s) 4 responsible for distributing the fuel into the tubular modules 20.
  • the mounting flanges 24 may have one or more axial through openings 248 allowing the passage of a distribution tube 4. Each through opening 248 preferably has a shape complementary to that of the distribution tube 4 it receives.
  • the through opening(s) 248 extend through the partition wall 246 to allow the distribution tube(s) to pass through the junction of two adjacent tubular modules 20.
  • the fixing flanges 24 comprise a single, central, through opening 248, allowing passage of the single distribution tube 4.
  • the fixing flanges 24 include one, two or three through openings 248 each allowing the passage of a separate distribution tube 4.
  • the mounting flanges 24 thus seal the ends of the tubular modules 20, except to create the calibrated leak or to allow the passage of the distribution tubes 4 from one module 20 to the other.
  • the mounting flanges 24 also support the distribution tubes 4 that extend inside the combustion tube 2. These distribution tubes 4 rest on the inner edge defining the corresponding through opening 248.
  • the distribution tubes 4 are intended to distribute the fuel in a predetermined manner within the combustion tube 2.
  • Each distribution tube 4 extends inside the combustion tube, along the longitudinal axis A, and includes (see for example the figure 18 ) an inlet port 40 allowing the fuel to enter.
  • This inlet port 40 can extend inside a feed module 8 of the burner 1.
  • the distribution tubes 4 are advantageously not modularly designed and can extend in a single piece from their upstream end, where the intake port is located, to their downstream end.
  • the distribution tubes 4 have a smaller diameter than the combustion tube 2 to allow fuel to flow around the distribution tubes 4, i.e., within the combustion tube 2, once the fuel has left the distribution tube 4.
  • each distribution tube 4 can be supported and held in place inside the combustion tube 2 by means of the fixing flanges 24.
  • Each distribution tube 4 includes a perforated portion 42, comprising one or more distribution orifices 420 (see figures 14, 15 ) through a side wall of the distribution tube 4, to allow the passage of fuel from the inside of the distribution tube 4 into the combustion tube 2.
  • the distribution orifices 420 may be in the form of slots, advantageously orthogonal to the longitudinal axis A of the burner 1. They may be arranged in a staggered pattern.
  • the burner 1 comprises, not according to the invention, a single distribution tube 4 and therefore a single combustion zone.
  • This single distribution tube 4 more precisely its perforated portion 42, extends through all the tubular modules 20 of the combustion tube 2 in order to distribute the fuel into each of these tubular modules 20, along the entire length of the burner 1.
  • the distribution orifices 420 are preferably arranged diametrically opposite the porous support 6 in order to distribute the mixture homogeneously within the combustion tube.
  • these distribution orifices 420 can be distributed at regular intervals along axis A, and for example, aligned.
  • the burner 1 comprises several distribution tubes 4 for creating several combustion zones A, B, C that can be controlled independently of each other.
  • Each distribution tube 4 is intended to distribute fuel into a predetermined combustion zone of the combustion tube 2.
  • these distribution tubes 4 include a primary distribution tube 4 which is intended to distribute the fuel in the combustion zone A furthest upstream of the combustion tube 2, and one or more (two depending on the example of the figures 10 to 13 ) 4 secondary distribution tubes intended to distribute fuel to combustion zones B, C located downstream.
  • the combustion tube 2 comprises three combustion zones A, B, C, and consequently three distribution tubes 4 to distribute the fuel to each of the three combustion zones A, B, C.
  • each combustion zone can be formed by the same number of tubular modules 20, for example three (the combustion tube 2 here comprising nine tubular modules 20).
  • the figure 11 shows the first area of combustion, the figure 12 the second combustion zone, the figure 13 the final combustion zone.
  • the primary and secondary distribution tubes 4 all include a perforated portion 42 having distribution orifices 420 intended to allow the passage of fuel from the interior of the distribution tube 4, primary or secondary, to the corresponding area of the combustion tube 2. These distribution orifices 420 are preferably arranged opposite the porous support 6.
  • the perforated portion 42 extends preferably from the first to the penultimate of the tubular modules 20 forming the combustion area concerned.
  • the perforated portion 42 has an upstream section 42a which, for the same segment length, has a larger perforation area than a downstream section 42b.
  • the upstream section 42a has more distribution orifices 420 than a segment of the same length of the downstream section 42b and/or distribution orifices 420 distributed over a wider angle than for the downstream section 42b.
  • the distribution orifices 420 of the upstream section 42a are arranged all around, i.e., at 360°, around the axis A.
  • the downstream section 42b has distribution orifices 420 distributed over an angular range, for example, between 100° and 140°, preferably between 110° and 130°, for example 119°, around the axis A.
  • the perforated portion 42 of the primary and secondary distribution tubes 4 advantageously comprises a terminal portion 44 which is axially closed by a deflector plug 440, allowing the fuel to slow down at the end of the combustion zone, as illustrated in the figure 17 Furthermore, as can be seen on the figure 16
  • the terminal section 44 includes a radial outlet 442 for releasing the remaining fuel inside the last tubular module 20 of the corresponding combustion zone. Unlike the distribution orifices 420 of the perforated section 42, this radial outlet 442 is advantageously arranged diametrically opposite the porous support 6.
  • the terminal portion 44 extends into the last of the tubular modules 20 forming the combustion zone served by the corresponding distribution tube 4.
  • this terminal portion 44 is arranged at the upstream end 20a of this tubular module 20, or in any case at a distance from the downstream end 20b, advantageously closer to the upstream end 20a than to the downstream end 20b.
  • the terminal portion 44 extends over a significantly shorter length than the perforated portion 42.
  • the length of the tube of distribution 4 in the last tubular module 20 of the combustion zone served is less than one fifth, preferably less than one tenth of the length of this tubular module 20.
  • the secondary distribution tubes 4 further include a blind portion 46 which is located upstream of their perforated portion 42.
  • This blind portion 46 in the form of a tube without perforations on its lateral wall, is intended to extend through the combustion zone(s) located upstream of that served by the perforated portion 42 of the same distribution tube 4.
  • the first combustion zone A is formed by the first three tubular modules 20.1, 20.2, 20.3 of the combustion tube 2, and the primary distribution tube 4A extends through these first three tubular modules 20.1, 20.2, 20.3.
  • the perforated part 42 of the primary combustion tube 2 extends through the first and second tubular modules 20.1, 20.2.
  • the perforated part 42 has an upstream portion 42a having a larger perforation area than a downstream portion, for example at 360°.
  • the perforated portion 42 has perforations arranged opposite the porous support 6, with a perforation area smaller than the upstream portion 42a, for example at 119°.
  • the primary distribution tube 4 includes a terminal portion 44 having the deflector plug 440 and a radial outlet opening 442. This terminal portion 44 extends near the upstream end 20a of the last of the tubular modules 20.3 forming the first combustion zone A, for approximately one-tenth of the length of this last tubular module 20.3.
  • the second combustion zone B is formed by the next three tubular modules 20.4, 20.5, 20.6 (fourth, fifth, and sixth modules) of the combustion tube.
  • the secondary distribution tube 4 which supplies the third combustion zone C, has its blind section 46 extending through modules 20.4, 20.5, and 20.6, so that it does not distribute fuel into this second combustion zone B.
  • the perforated section 42 of the secondary distribution tube 4 supplying the second combustion zone B extends through the fourth and fifth tubular modules 20.4 and 20.5.
  • the perforated section 42 has an upstream portion 42a with a larger perforation area, for example, 360°, than the downstream portion 42b.
  • the perforated portion 42 has distribution orifices 420 arranged opposite the porous support 6, with a perforation area smaller than the upstream portion 42a, for example at 119°.
  • the secondary distribution tube 4 serving this second combustion zone B includes a terminal portion 44 having a deflector plug 440 and a radial outlet opening 442. This terminal portion 44 extends near the upstream end of the last of the tubular modules 20.6, over approximately one-tenth of the length of this last tubular module 20.6.
  • the third combustion zone C is formed by the next three tubular modules 20.7, 20.8, 20.9 (seventh, eighth, and ninth modules) of the combustion tube.
  • the perforated portion 42 of the secondary distribution tube 4 serving this third combustion zone C extends through the seventh and eighth tubular modules 20.7, 20.8.
  • the perforated portion 42 has an upstream portion 42a with a larger perforation area, for example, 360°, than a downstream portion 42b.
  • the perforated portion 42 has distribution orifices 420 arranged opposite the porous support 6, with a perforation area smaller than the upstream portion 42a, for example at 119°.
  • the distribution tube 4 includes an end portion 44 having a deflector plug 440 and a radial outlet opening 442. This end portion 44 extends near the upstream end of the last of the tubular modules 20.9, over approximately one-tenth of the length of this last tubular module 20.9.
  • the burner 1 includes a feed module 8 connected upstream of the combustion tube 2 to supply each distribution tube 4 with fuel.
  • the feed module 8, as well as the closure module 10 if present, can be connected to the first, and respectively the last, of the tubular modules 20 forming the combustion tube 2 by means of the previously described fastening means, such as the fastening flanges 24.
  • the feed module 8 enables the supply of fuel to the distribution tube(s) 4.
  • the burner 1 advantageously includes means for adjusting the fuel flow rate entering each tube of Distribution 4. Having several distribution tubes 4, the adjustment means allow the fuel flow rate to be adjusted for each distribution tube 4 independently of each other. As illustrated on the figure 18
  • the adjustment means may include, for each distribution tube 4, an adjustment screw 80.
  • the power supply module 8 includes sparking means, such as electrodes 82 visible on the figure 8 enabling combustion, and a terminal portion connected to the first tubular module 20, this terminal portion 84 comprising one or more sparking orifices 840 passing through a side wall of the feed module 8 below the sparking means to allow fuel to pass to the sparking means.
  • the porous support 6 extends between the sparking means and the sparking orifice(s) 840.
  • the perforation area of this terminal portion 84 is advantageously larger than that of the combustion tube 2 downstream.
  • the sparking orifices 840 may be in the form of slots, advantageously orthogonal to the longitudinal axis A of the burner 1. These sparking orifices may be arranged in a staggered pattern.
  • the invention also relates to an oven comprising a burner 1 as previously described.
  • this oven can be a food-grade oven intended for baking foods such as biscuits, pancakes, bread, brioches, etc.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Wick-Type Burners And Burners With Porous Materials (AREA)

Claims (10)

  1. Brenner (1), umfassend einen porösem Träger (6) und ein Brennrohr
    (2), entlang dessen der poröse Träger (6) montiert ist, wobei das Brennrohr (2) eine oder mehrere Öffnungen aufweist, um einen Brennstoff in den porösen Träger (6) durchfließen zu lassen, wobei das Brennrohr (2) aus einer Vielzahl von miteinander verbundenen Rohrmodulen (20) gebildet ist und wobei der Brenner (1) ferner mindestens ein Verteilerrohr (4) umfasst, das sich innerhalb des Brennrohrs (2) erstreckt, um den Brennstoff in vorbestimmter Weise in dem Brennrohr zu verteilen, wobei der Brenner (1) mehrere Verteilerrohre (4) umfasst, darunter ein primäres Verteilerrohr (4), das dazu bestimmt ist, den Brennstoff in einen ersten Brennbereich zu verteilen, der durch ein oder mehrere Rohrmodule (20) des Brennrohrs gebildet wird, und mindestens ein sekundäres Verteilerrohr (4), das so eingerichtet ist, dass es den Brennstoff in einer vorbestimmten Weise in einem nachgelagerten Brennbereich in Bezug auf den ersten Brennbereich verteilt, der durch ein oder mehrere andere Rohrmodule (20) des Brennrohrs gebildet wird, wobei der Brenner dadurch gekennzeichnet ist, dass die Öffnung(en) (22) des Brennrohrs (2) Schlitze orthogonal zu einer Längsachse (A) des Brenners (1) sind, und dass sowohl das primäre Verteilerrohr (4) als auch das mindestens eine sekundäre Verteilerrohr (4) einen gelochten Teil (42) aufweisen, der einen vorgelagerten Abschnitt (42a) aufweist, der einen Perforationsbereich aufweist, der größer ist als ein nachgelagerter Abschnitt (42b) mit derselben Länge wie der des vorgelagerten Abschnitts (42a), wobei die perforierte Gesamtfläche des vorgelagerten Abschnitts (42a) größer ist als die des nachgelagerten Abschnitts (42b).
  2. Brenner (1) nach Anspruch 1, wobei der Brenner (1) Befestigungsmittel umfasst, die so eingerichtet sind, dass sie benachbarte Rohrmodule (20) dicht befestigen.
  3. Brenner (1) nach dem vorhergehenden Anspruch, wobei die Befestigungsmittel Befestigungsflansche (24) umfassen, die aneinander anliegen.
  4. Brenner (1) nach dem vorhergehenden Anspruch, wobei die Befestigungsflansche (24) das mindestens eine Verteilerrohr (4) innerhalb des Brennrohrs tragen.
  5. Brenner (1) nach einem der Ansprüche 2 bis 4, wobei die Befestigungsmittel kalibrierte Leckmittel umfassen, mit denen Brennstoff zu dem porösen Träger (6) an der Verbindung der benachbarten Rohrmodule (20) durchfließen kann.
  6. Brenner (1) nach einem der Ansprüche 1 bis 5, wobei das primäre Verteilerrohr (4) und das mindestens eine sekundäre Verteilerrohr (4) den offenen Teil (42) aufweisen, der gegenüber dem porösen Träger (6) angeordnete Verteileröffnungen (420) umfasst.
  7. Brenner (1) nach einem der Ansprüche 1 bis 6, wobei das primäre Verteilerrohr (4) und das mindestens eine sekundäre Verteilerrohr (4) einen Endabschnitt aufweisen, der einen axialen Stopfen (440) und eine radiale Auslassöffnung (442) umfasst.
  8. Brenner (1) nach dem vorhergehenden Anspruch, wobei der Endabschnitt in einem Abstand von einem nachgelagerten Ende des entsprechenden Brennbereichs angeordnet ist, vorzugsweise an einem vorgelagerten Ende des letzten der Rohrmodule (20), die den entsprechenden Brennbereich bilden.
  9. Brenner (1) nach einem der Ansprüche 1 bis 8, wobei der Brenner (1) Einstellmittel umfasst, die so eingerichtet sind, dass sie unabhängig die in jedes Verteilerrohr (4) eintretende Brennstoffmenge einstellen.
  10. Ofen, umfassend einen Brenner (1) nach einem der vorhergehenden Ansprüche.
EP20750708.8A 2019-07-11 2020-07-10 Modularer brenner und ofen mit diesem brenner Active EP3997384B1 (de)

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FR1907813A FR3098568B1 (fr) 2019-07-11 2019-07-11 Brûleur et four comprenant ce brûleur
PCT/FR2020/051250 WO2021005316A1 (fr) 2019-07-11 2020-07-10 Brûleur modulaire et four comprenant ce brûleur

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EP2914903A1 (de) * 2012-10-31 2015-09-09 Bekaert Combustion Technology B.V. Gasvormischungsbrenner

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US4543940A (en) * 1983-08-16 1985-10-01 Gas Research Institute Segmented radiant burner assembly and combustion process
JPH08270914A (ja) * 1995-02-15 1996-10-18 Nederland Gasunie Nv バーナー
US6354831B1 (en) * 1998-04-20 2002-03-12 R & R Holdings, Inc. Porous gas burner
FR2903278B1 (fr) * 2006-07-07 2008-09-26 Gen Biscuit Sa Four tunnel notamment pour biscuiterie.
CN204213927U (zh) * 2014-10-28 2015-03-18 上海艾迪迦热能科技有限公司 模块化火焰处理燃烧器系统装置

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EP2914903A1 (de) * 2012-10-31 2015-09-09 Bekaert Combustion Technology B.V. Gasvormischungsbrenner

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EP3997384A1 (de) 2022-05-18
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ES3059955T3 (en) 2026-03-24
CA3146685A1 (fr) 2021-01-14
US20220186925A1 (en) 2022-06-16
FR3098568B1 (fr) 2021-10-08
FR3098568A1 (fr) 2021-01-15

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