WO2011057897A1 - Brûleur radiant à écrans multiples - Google Patents

Brûleur radiant à écrans multiples Download PDF

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Publication number
WO2011057897A1
WO2011057897A1 PCT/EP2010/066358 EP2010066358W WO2011057897A1 WO 2011057897 A1 WO2011057897 A1 WO 2011057897A1 EP 2010066358 W EP2010066358 W EP 2010066358W WO 2011057897 A1 WO2011057897 A1 WO 2011057897A1
Authority
WO
WIPO (PCT)
Prior art keywords
radiant
screen
burner
radiant burner
screens
Prior art date
Application number
PCT/EP2010/066358
Other languages
English (en)
Inventor
Geert Dumortier
Valérie OLALDE
Original Assignee
Nv Bekaert Sa
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 Nv Bekaert Sa filed Critical Nv Bekaert Sa
Publication of WO2011057897A1 publication Critical patent/WO2011057897A1/fr

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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
    • F23D14/12—Radiant burners
    • F23D14/14—Radiant burners using screens or perforated plates
    • F23D14/149—Radiant burners using screens or perforated plates with wires, threads or gauzes as radiation intensifying means
    • 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
    • F23D14/12—Radiant burners
    • F23D14/14—Radiant burners using screens or perforated plates
    • F23D14/145—Radiant burners using screens or perforated plates combustion being stabilised at a screen or a perforated plate
    • 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
    • F23D14/12—Radiant burners
    • F23D14/14—Radiant burners using screens or perforated plates
    • F23D14/148—Radiant burners using screens or perforated plates with grids, e.g. strips or rods, as radiation intensifying means

Definitions

  • the present invention relates to radiant burners comprising a radiant
  • Radiant burners comprising a radiant burner plate and a screen are known e.g. from US4799879 or EP0539279.
  • the screen together with the radiant burner plate provides the radiative output of the burner, which averages at levels around 50% efficiency.
  • the radiative output of the burners has been increased by modification of the radiant burner plate from a radiant burner plate with rows of through holes or perforations serving to channel the mixture of air and combustion agent from the rear of the plate to the radiating face, to a radiant burner plate wherein the through holes or perforations are arranged in what is nowadays called honeycomb pattern as described in e.g. US4,569,657 or US4, 799,879.
  • An aspect of the claimed invention provides a radiant burner which
  • the radiant burner comprises a body defining a premixing chamber and a combustion chamber.
  • the premixing chamber is separated from the combustion chamber by at least one radiant burner plate.
  • the combustion chamber is further delimited by a first radiant screen.
  • the radiant burner further comprises a second radiant screen in the combustion chamber.
  • the second radiant screen is spaced from the radiant burner plate(s) and the first radiant screen. Any further radiant screen in the combustion chamber is arranged in the same way with respect to other radiant screens in the combustion chamber and/or the radiant burner plate(s).
  • the open area ratio (OAR) of the radiant burner is ranging between 0 and 45%, preferably ranging between 15 and 35%. It was found that such an OAR of the radiant burner increases the radiant burner efficiency with improved gas combustion, i.e. reduction of CO emission. The overall reduction of CO emission can amount up to 70%. However, the lifetime of the radiant burner plate(s) can decrease.
  • the radiant burner can further be provided with a further screen at the
  • Such outer screen is mainly functioning as protection in case of screen breakage or screen deformation protecting the passing web from contact with the burner screen.
  • Such outer screen can also be made of highly heat resistant or radiant material, as described further.
  • Such screen generally has an OAR higher than 90%.
  • a further aspect of the present invention provides a radiant burner as
  • An alternative further aspect of the present invention provides a radiant burner as described in paragraph 005, 006 or 007, wherein the at least one radiant burner plate is provided with a high emissivity coating or layer, such as e.g. metal oxide coatings, such as those of cobalt, nickel, chromium, and thorium, as well as metal silicates and siliceous carbide (SiC).
  • a high emissivity coating or layer such as e.g. metal oxide coatings, such as those of cobalt, nickel, chromium, and thorium, as well as metal silicates and siliceous carbide (SiC).
  • the first, second and/or any further radiant screen is an arrangement of parallel spaced round rods or square bars.
  • the first, second and/or any further radiant screen is a woven grid.
  • the radiant screens are produced from highly heat resistant materials such as ceramics, especially aluminium or zirconium oxide, aluminium titanate, silicon oxide, corundum or mullite, silicon carbide, silicon nitride or metal infiltrated ceramics, such as silicon- infiltrated silicon carbide.
  • the radiant screens can also be fabricated from heat-resistant materials of other nature such as e.g.
  • the radiant screens are fabricated from highly heat resistant steel grades, such as high level stainless steel grades like Kanthal APM or APMT, different grades of FeCrAI alloy designed for high temperature corrosion, Chrome/Nickel steel grades like Avesta 253 MA, 153 MA, Inconel 601 , Incoloy 800HT, Incoloy MA956.
  • the different radiant screens can be made from different materials.
  • the first radiant screen is a metal woven grid and the further radiant screen(s) is an arrangement of parallel spaced round rods or square bars, or the other way around.
  • the radiant burner plate is preferably made of a cerannic material with high temperature resistance, and excellent mechanical and thermodynamic properties such as e.g. cordierite or zirconia; partially stabilised zirconia (PSZ), alumina, silicon carbides or other high level technical ceramics.
  • the radiant burner plate can be any conventional type of burner plate. It can be a multilevel burner plate as described in e.g. US 3,683,058 or FR 1 ,297,959; honeycomb patterned burner plates as described e.g. US 4,569,657; a radiant element with continuous ducts being hollow space radiators as e.g. described in US 6,575,736 or flat radiant elements as e.g. described in GB 1 ,247,1 17.
  • the distance between the radiant screen is the distance between the radiant screen
  • nearest the radiant burner plate(s) and the radiant burner plate(s) is ranging between 3mm and 20mm, more preferably, ranging between 4mm and 10mm.
  • the plate(s) is preferably ranging between 15mm and 40mm, more preferably the distance between the first radiant screen and the radiant burner plate(s) is less than 25mm.
  • the distance between the individual radiant screens is preferably ranging between 3mm and 20mm, even more preferably between 5mm and 15mm.
  • the individual radiant screens are all
  • the first radiant screen is preferably a metal grid.
  • the first radiant screen is an arrangement of parallel spaced round rods or square bars. More preferably, the first and second radiant screens are made of an arrangement of parallel spaced round rods or square bars.
  • the first and second radiant screens are arranged in the same direction.
  • the direction of the first and second radiant screens are arranged at an angle with respect to one another. More preferably, the first and second radiant screens are shifted at a 90° angle. In case further radiant screens are present in the radiant burner, the direction of the individual radiant screens can further be tuned for optimal burner efficiency.
  • Open Area ratio (OAR) of a radiant screen is the percentage of the
  • Open Area ratio (OAR) of the radiant burner is the combined ratio of the intersection of the openings of the individual radiant screens in relation to the average area of the first screen and the area of burner surface. This ratio is expressed as a percentage.
  • the Open Area Ratio of a radiant burner can e.g. be measured by using graphical measuring methods such as digital image processing wherein a picture of the burner viewed from the front (with a white paper at the radiant burner plate(s)) is processed for white spaces.
  • Other useful technologies comprise e.g. Nikon®'s Nexiv system.
  • Figure 1 shows an example embodiment of the present invention, with cut out for better view of the build up of the radiant burner.
  • Figure 2 shows a side view of the example radiant burner of figure 1 , also with cut out for better view of the build up of the radiant burner.
  • Figure 3 shows an alternative example embodiment of the present
  • Figure 4 shows a side view of the example radiant burner of figure 3, also with cut out for better view of the build up of the radiant burner.
  • Figure 5 shows a schematic side view of an exemplary radiant burner.
  • Figures 1 and 2 show an example embodiment of the present invention.
  • the first radiant screen 3 is a highly heat resisting metal grid fabricated from highly heat resistant steel grades, such as high level stainless steel grades like Kanthal APM or APMT, different grades of FeCrAI alloy designed for high temperature corrosion, Chrome/Nickel steel grades like Avesta 253 MA, 153 MA, Inconel 601 , Incoloy 800HT, Incoloy MA956.
  • the second radiant screen 4 is made of a highly heat resisting ceramic material, in this example aluminium or zirconium oxide, aluminium titanate, silicon oxide, corundum or mullite, silicon carbide, silicon nitride or metal infiltrated ceramics, such as silicon-infiltrated silicon carbide with a silicon infiltration grade of 5 to 50 % or even more.
  • the radiant screens can also be fabricated from heat-resistant materials of other nature such as e.g. materials which contain more than 50% by weight of a metal silicide, such as molybdenum disilicide (M0S12) or tungsten disilicide (WS12).
  • M0S12 molybdenum disilicide
  • WS12 tungsten disilicide
  • the radiant burner plate 2 is a ceramic tile made of cordorite or alternate thermodynamically suited ceramics as mentioned above.
  • An example of a radiant burner according to the present invention and figures 1 and 2 has a first screen with an OAR of 43% and a second screen with an OAR of 63%.
  • This burner also has an outer screen 9, which is present to overcome possible problems in case of breakage or deformation of the first screen 3.
  • the first screen is a metal grid 3 made of Kanthal APM and the second screen 4 is made of ceramic SiC isostatic bars.
  • the distance between screens is 10 mm and the distance between the second screen and the ceramic tile is 9 mm.
  • the overall OAR of the radiant burner is then 28%. An increase of burner efficiency of 4% was observed when compared to a radiant burner with only the woven screen.
  • FIGS 3 and 4 show an alternative example embodiment of the present invention.
  • the first and second radiant screens are at differing directions, in this example they are at an angle of 90°.
  • the first and second radiant screens are made of highly heat resisting material, in this example a ceramic such as aluminium or zirconium oxide, aluminium titanate, silicon oxide, corundum or mullite, silicon carbide, silicon nitride or metal infiltrated ceramics, such as silicon-infiltrated silicon carbide with a silicon infiltration grade of 5 to 50 % or even more.
  • the radiant screens can also be fabricated from heat-resistant materials of other nature such as e.g. materials which contain more than 50% by weight of a metal silicide, such as molybdenum disilicide (M0S12) or tungsten disilicide.
  • M0S12 molybdenum disilicide
  • An example of a radiant burner according to the present invention has a first screen with an OAR of 27% and a second screen with an OAR of 30%.
  • the first and the second screens are made of ceramic SiC isostatic bars.
  • the screens are arranged in directions which are 90° with respect to one another.
  • the distance between screens is 17mm and the distance between the second screen and the ceramic tile is 9 mm.
  • the overall OAR of the radiant burner in this example is 8%. This set up has an increase in burner efficiency of 14% and a reduction in CO emission of 70%.
  • An example of a radiant burner according to the present invention has a first screen with an OAR of 27% and a second screen with an OAR of 67%.
  • the first and the second screens are made of ceramic isostatic bars.
  • the screens are arranged in directions which are 90° with respect to one another. Also in this example the distance between screens is 17mm and the distance between the second screen and the ceramic tile is 9 mm.
  • the overall OAR of the radiant burner in this example is 18%. This set up has an increase a reduction in CO emission of 25%.
  • Another example of a radiant burner according to the present invention has a first screen with an OAR of 30% and a second screen with an OAR of 27%.
  • the first and second screens are made of ceramic isostatic bars.
  • the screens are arranged in directions which are 45° with respect to one another.
  • the overall OAR of the radiant burner in this example is 29%.
  • FIG. 1 Another example of a radiant burner according to the present invention is a burner with two screens of isostatic bars. Both screens have the same number of bars and are arranged in directions which are 0° with respect to one another and are completely shifted with respect to one another, which means that each isostatic bar of the first screen 3 is in front of the space inbetween the bars of the second screen 4. Both screens each have an OAR of 50%. The overall OAR of the radiant burner is then 0%.
  • FIG. 1 Another example of a radiant burner according to the present invention is a burner with 2 identical screens with isostatic bars.
  • the screens are arranged in directions which are 0° with respect to one another but the isostatic bars are on top each other, which means that each isostatic bar of the first screen 3 is in front of an isostatic bar of the second screen 4.
  • Each screen has an OAR of 50%.
  • This burner has an OAR of 50%.
  • Another example of a radiant burner according to the present invention has a first screen with an OAR of 25% and a second screen with an OAR of 75%.
  • the first and second screens are made of ceramic isostatic bars.
  • the distance between screens is 10mm and the distance between the second screen and the ceramic tile is 9mm.
  • the screens are arranged in directions which are 90° with respect to one another.
  • the overall OAR of the radiant burner in this example is 19%.
  • a further example of a radiant burner according to the present invention has a first screen with an OAR of 39%, a second screen with an OAR of 67% and a third screen of 88%.
  • the second and third screen are made of ceramic isostatic bars and the first screen is a highly heat resisting metal grid fabricated from highly heat resistant steel grade Kanthal APM.
  • the distance between the last screen and the ceramic tile is 9 mm.
  • the distance between the third screen 5 and the second screen 4 is 13 mm and the distance between the second screen 4 and the first screen 3 is 10 mm.
  • the second screen is arranged in a direction which is at a 90° angle with respect to the third screen.
  • the overall OAR of the radiant burner in this example is 23%.
  • Figure 5 shows a schematic side view of an exemplary radiant burner having four radiant screens.
  • the first radiant screen 3 delimiting the combustion chamber from the exterior of the radiant burner 1.
  • the second radiant screen 4 is, in this example, parallel to the first radiant screen 3 and also parallel to the radiant burner plate 2, and is located in the combustion chamber 8.
  • the third radiant screen 5 and fourth radiant screen 6 are also located inside the combustion chamber 8 of radiant burner 1 and are also located parallel to the first 3 and second 4 radiant screens and parallel to the radiant burner plate and to one another. All radiant screens in the radiant burner 1 do not touch each other.
  • the OAR's of the individual radiant screens is preferably decreasing in downstream direction.
  • Example ranges of such AOR are given in table 1 , for a radiant burner having 2, 3 and 4 screens.
  • the possible increases in burner efficiency, and reduction in CO emission, are dependent on the OAR of the individual screens and the arrangement of the screens in the burner.
  • the overall OAR of the radiant burner can be tuned to the distance between the first radiant screen and the radiant burner plate(s). E.g. if the distance between the first radiant screen and the radiant burner plate(s) is less than 30mm, the OAR of the radiant burner is preferably larger than 15%.
  • a further enhancement of the radiant burners was obtained by using a high emissivity coating, in this example SiC, on the radiant burner plate(s) 2.
  • a high emissivity coating in this example SiC
  • An exemplary radiant burner according to the present invention wherein the radiant burner plate(s) is provided with a SiC coating is compared to a radiant burner with uncoated radiant burner plate(s) but also according to the present invention in table 2.
  • the radiant burner of the present invention are particularly suitable for drying web materials at high web speeds.
  • One preferred area of application is the drying of moving paper webs.
  • the new improved radiant burner 1 comprises a body defining a premixing chamber 7 and a combustion chamber 8.
  • the premixing chamber 7 is separated from the combustion chamber 8 by at least one radiant burner plate 2.
  • the combustion chamber 8 is further limited by a first radiant screen 3.
  • the radiant burner 1 further comprises at least one second radiant screen 4 in the combustion chamber 8.
  • the second radiant screen 4 is spaced from the radiant burner plate 2 and spaced from said first radiant screen 3.
  • the radiant burner 1 having an open area ratio (AOR) ranging between 10 and 45%.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)

Abstract

L'invention porte sur un brûleur radiant (1), qui comprend un corps définissant une chambre de pré-mélange (7) et une chambre de combustion (8). La chambre de pré-mélange (7) est séparée de la chambre de combustion (8) par au moins une plaque de brûleur radiant (2). La chambre de combustion (8) est de plus délimitée par un premier écran radiant (3). Le brûleur radiant comprend de plus un deuxième écran radiant (4) dans la chambre de combustion. Le brûleur radiant (1) a un rapport de surface ouverte (AOR) compris entre 0 et 45 %.
PCT/EP2010/066358 2009-11-13 2010-10-28 Brûleur radiant à écrans multiples WO2011057897A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP09175945.6 2009-11-13
EP09175945 2009-11-13

Publications (1)

Publication Number Publication Date
WO2011057897A1 true WO2011057897A1 (fr) 2011-05-19

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ID=42077164

Family Applications (1)

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PCT/EP2010/066358 WO2011057897A1 (fr) 2009-11-13 2010-10-28 Brûleur radiant à écrans multiples

Country Status (1)

Country Link
WO (1) WO2011057897A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015210060A (ja) * 2014-04-30 2015-11-24 株式会社Ihi 燃焼加熱器
JP2018514736A (ja) * 2015-03-30 2018-06-07 エドワーズ リミテッド 汚染ガスを焼却するための放射バーナー
WO2018197069A1 (fr) * 2017-04-28 2018-11-01 Voith Patent Gmbh Émetteur infrarouge

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1297959A (fr) 1961-06-15 1962-07-06 Radiant Heat N V Surface rayonnante à combustion profonde
GB1247117A (en) 1969-06-05 1971-09-22 Westinghouse Electric Corp Radiant heater assembly
US3683058A (en) 1969-08-25 1972-08-08 Maurice Partiot Infrared burners and high efficiency radiant plates
US3847536A (en) 1972-05-08 1974-11-12 Antargaz Radiant burner operating at high temperature
JPS60114615A (ja) * 1983-11-24 1985-06-21 Osaka Gas Co Ltd 赤外線輻射ガスバ−ナ
US4569657A (en) 1982-10-11 1986-02-11 Solaronics Vaneecke Plate with alveolar radiating face for radiant burner
US4799879A (en) 1985-12-02 1989-01-24 Solaronics Vaneecke Radiant burners with a ceramic frame
EP0539278A1 (fr) * 1991-10-25 1993-04-28 Gaz De France Brûleur radiant à écran céramique
EP0539279A1 (fr) 1991-10-21 1993-04-28 SAGEM ALLUMAGE Société Anonyme Coiffe de connecteur de liaison pour câble électrique
US5326257A (en) * 1992-10-21 1994-07-05 Maxon Corporation Gas-fired radiant burner
US5711661A (en) * 1994-05-03 1998-01-27 Quantum Group, Inc. High intensity, low NOx matrix burner
US6575736B1 (en) 1999-01-14 2003-06-10 Kreiger Gmbh & Co. Kg Infrared radiator that is designed as surface radiator
US20050017203A1 (en) * 2002-02-12 2005-01-27 Richard Aust Infrared emitter embodied as a planar emitter
DE102004044194A1 (de) * 2004-09-13 2006-03-16 Gogas Goch Gmbh & Co. Kg Doppelgitter

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1297959A (fr) 1961-06-15 1962-07-06 Radiant Heat N V Surface rayonnante à combustion profonde
GB1247117A (en) 1969-06-05 1971-09-22 Westinghouse Electric Corp Radiant heater assembly
US3683058A (en) 1969-08-25 1972-08-08 Maurice Partiot Infrared burners and high efficiency radiant plates
US3847536A (en) 1972-05-08 1974-11-12 Antargaz Radiant burner operating at high temperature
US4569657A (en) 1982-10-11 1986-02-11 Solaronics Vaneecke Plate with alveolar radiating face for radiant burner
JPS60114615A (ja) * 1983-11-24 1985-06-21 Osaka Gas Co Ltd 赤外線輻射ガスバ−ナ
US4799879A (en) 1985-12-02 1989-01-24 Solaronics Vaneecke Radiant burners with a ceramic frame
EP0539279A1 (fr) 1991-10-21 1993-04-28 SAGEM ALLUMAGE Société Anonyme Coiffe de connecteur de liaison pour câble électrique
EP0539278A1 (fr) * 1991-10-25 1993-04-28 Gaz De France Brûleur radiant à écran céramique
US5326257A (en) * 1992-10-21 1994-07-05 Maxon Corporation Gas-fired radiant burner
US5711661A (en) * 1994-05-03 1998-01-27 Quantum Group, Inc. High intensity, low NOx matrix burner
US6575736B1 (en) 1999-01-14 2003-06-10 Kreiger Gmbh & Co. Kg Infrared radiator that is designed as surface radiator
US20050017203A1 (en) * 2002-02-12 2005-01-27 Richard Aust Infrared emitter embodied as a planar emitter
DE102004044194A1 (de) * 2004-09-13 2006-03-16 Gogas Goch Gmbh & Co. Kg Doppelgitter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015210060A (ja) * 2014-04-30 2015-11-24 株式会社Ihi 燃焼加熱器
JP2018514736A (ja) * 2015-03-30 2018-06-07 エドワーズ リミテッド 汚染ガスを焼却するための放射バーナー
US11112110B2 (en) 2015-03-30 2021-09-07 Edwards Limited Radiant burner
WO2018197069A1 (fr) * 2017-04-28 2018-11-01 Voith Patent Gmbh Émetteur infrarouge

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