WO2019057483A1 - Brûleur à gaz à prémélange cylindrique dans un échangeur de chaleur - Google Patents

Brûleur à gaz à prémélange cylindrique dans un échangeur de chaleur Download PDF

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Publication number
WO2019057483A1
WO2019057483A1 PCT/EP2018/073726 EP2018073726W WO2019057483A1 WO 2019057483 A1 WO2019057483 A1 WO 2019057483A1 EP 2018073726 W EP2018073726 W EP 2018073726W WO 2019057483 A1 WO2019057483 A1 WO 2019057483A1
Authority
WO
WIPO (PCT)
Prior art keywords
burner
cylindrical shell
textile fabric
cylindrical
fabric
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.)
Ceased
Application number
PCT/EP2018/073726
Other languages
English (en)
Inventor
Marc BUS
Gertjan Zwiggelaar
Arnoldus Martinus VAN WIJK
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.)
Bekaert Combustion Technology BV
Original Assignee
Bekaert Combustion Technology BV
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 Bekaert Combustion Technology BV filed Critical Bekaert Combustion Technology BV
Publication of WO2019057483A1 publication Critical patent/WO2019057483A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • 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
    • 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
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/101—Flame diffusing means characterised by surface shape
    • F23D2203/1012—Flame diffusing means characterised by surface shape tubular
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/102—Flame diffusing means using perforated plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2211/00—Thermal dilatation prevention or compensation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2212/00—Burner material specifications
    • F23D2212/10—Burner material specifications ceramic
    • F23D2212/103—Fibres
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2212/00—Burner material specifications
    • F23D2212/20—Burner material specifications metallic
    • F23D2212/201—Fibres
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/12—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium
    • F24H1/124—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium using fluid fuel

Definitions

  • the invention relates to the field of heat cells in which cylindrical premix gas burners are used. Such heat cells are used in boilers.
  • Cylindrical premix gas burners can be installed in the combustion chamber of a heat exchanger of a boiler. Cylindrical premix gas burners can be installed in cast aluminum heat exchangers (e.g. in sectional cast heat exchangers as in WO2015/024712 A1 ) or in heat exchangers provided by spirally winding one or more metal tubes (see e.g.
  • Cylindrical gas burners exist in different types.
  • a first type comprises a cylindrical burner deck provided by a perforated metal plate, as is e.g. disclosed in WO2009/077505A1.
  • a second type comprises a cylindrical burner deck provided by a fabric composed out of ceramic or metal fibers.
  • US4721456A provides an example of a cylindrical premix gas burner having a cylindrical burner deck provided by a fabric out of ceramic fibers.
  • WO2012/152571A1 discloses a cylindrical premix gas burner having a cylindrical burner deck comprising a fiber based substrate, e.g. comprising metal fibers.
  • the invention relates to a heat cell comprising a cylindrical premix gas burner and a heat exchanger.
  • the cylindrical premix gas burner comprises a mixing chamber, a cylindrical shell provided around the mixing chamber, an impervious end cap provided at a first end of the cylindrical shell, an inlet at the second end of the cylindrical shell provided for the supply of premix gas into the mixing chamber; and a textile fabric comprising heat resistant fibers.
  • the cylindrical shell comprises a gas permeably burner deck onto which combustion is stabilized after premix gas has flown from the mixing chamber through the burner deck.
  • the textile fabric comprises along the circumference of the cylindrical shell a fabric section extending freely at the side of the end cap in the length direction of the burner beyond the end of the cylindrical shell.
  • the heat exchanger comprises a combustion chamber having an end wall.
  • the cylindrical premix gas burner is installed in the combustion chamber.
  • the fabric section of the textile fabric is configured for providing a seal along the circumference of the cylindrical shell between the end of the burner and the end wall of the combustion chamber when the burner is in use. Cylindrical premix gas burners get hot when the burner is in use. An expansion of the burner is the consequence. When the burner is provided in a combustion chamber of a heat exchanger, thermal expansion of the burner must be possible. Therefore, it is common practice to provide a gap between the impervious end cap of the cylindrical gas premix burner and the end wall of the heat exchanger.
  • a bigger gap needs to be provided for longer cylindrical premix gas burners.
  • the presence of the gap provokes a flow of flue gas into the gap generated by the burner. If this flow of flue gas is too big, excessive heating of the end cap occurs.
  • This phenomenon leads to early mechanical failure of the burner, e.g. through mechanical failure of the end cap, of the connection between the end cap and the cylindrical shell of the burner; or of the shell of the burner itself.
  • the fabric section of the textile fabric along the circumference of the cylindrical shell extending freely at the side of the end cap in the length direction of the burner beyond the end of the cylindrical shell will create a seal.
  • the fabric section of the textile fabric will touch the end wall of the heat exchanger along part of or along the full circumference of the burner, creating a flexible seal around the gap between the end of the cylindrical burner and the end wall of the heat exchanger, minimizing or fully preventing the flow of flue gas into the gap.
  • the flexibility of the seal allows thermal expansion of the burner when the burner is in use. Therefore, the invention provides heat cells with cylindrical premix gas burners with a longer lifetime when installed in the heat exchanger of the heat cell.
  • the gap is - in cold condition of the burner - at least 5 mm, more preferably at least 10 mm.
  • the fabric section extends over a length of at least 5 mm - and preferably over at least 10 mm, more preferably over at least 15 mm, more preferably over at least 20 mm, even more preferably over at least 25 mm - beyond the end of the cylindrical shell.
  • the length of the cylindrical shell is at least 500 mm, preferably at least 750 mm, more preferably at least 1000 mm. Burners that have a longer length of the cylindrical shell will expand more when in use, as the thermal expansion is directly proportional to the length of the cylindrical shell. As the thermal expansion of such burners is bigger, a larger gap needs to be provided between the end of the cylindrical shell and the end wall of the heat exchanger when installing the burner in the combustion chamber of the heat exchanger.
  • the diameter of the burner is at least 200 mm, more preferably at least 250 mm; even more preferably at least 300 mm.
  • the diameter of a burner is most cases related to its length, burners with larger diameter have a higher risk of early failure because of flue gas flowing into the gap between the end of the cylindrical shell and the end wall of the heat exchanger.
  • the end cap closes the mixing chamber. More preferably, the end cap is connected to the cylindrical shell by means of welds or by means of a crimped connection.
  • the end cap is concave when observed from the outside of the burner.
  • Such embodiments facilitate the provision of the seal by the fabric section of the textile fabric sealing the gap between the burner and the end wall of the heat exchanger.
  • the freely extending fabric section of the textile fabric is folded over, preferably towards to the inside of the burner.
  • the fabric section of the textile fabric is folded over are beneficial as they provide a more effective seal.
  • the folded over end is bonded onto the end cap, e.g. by means of spot welds or by means of an adhesive. In a more preferred
  • the textile fabric provides the burner deck onto which combustion is stabilized; and the freely extending fabric section of the textile fabric which is folded over is a separate textile fabric from the textile fabric providing the burner deck onto which combustion is stabilized.
  • the textile fabric is a woven, knitted or braided burner deck. More preferably, the textile fabric comprises metal fibers. Even more preferably, the woven, knitted or braided fabric comprises yarns which comprise a plurality of metal fibers in their cross section. Textile fabrics as disclosed in WO9704152A1 can be advantageously used in the invention.
  • the textile fabric provides the burner deck onto which combustion is stabilized. It is meant that - when the burner is in use - the flames are anchored onto the textile fabric. More preferably, the cylindrical shell comprises a perforated plate, woven wire mesh or an expanded metal sheet; and the textile fabric providing the burner deck is provided around and contacting the perforated plate, woven wire mesh or expanded metal sheet.
  • the fabric section extending freely at the side of the end cap in the length direction of the burner beyond the end of the cylindrical shell is another textile fabric than the textile fabric providing the burner deck onto which combustion is stabilized.
  • the fabric section extending freely at the side of the end cap can e.g. be a fabric strip; more preferably, the fabric strip is folded over such that the seal is provided by a double layer of the fabric strip.
  • the burner deck is provided by a perforated metal plate. It is meant that the flames are anchored onto the perforated metal plate. More preferably, the perforated plate comprises circular perforations as well as slit shaped perforations.
  • the end cap is concave when observed from the outside of the burner. The end cap comprises a rim; and the textile fabric - which provides the fabric section extending freely at the side of the end cap in the length direction of the burner beyond the end of the cylindrical shell - is fixed onto the inside or onto the outside of the rim of the end cap.
  • the cylindrical shell comprises a perforated plate, woven wire mesh or an expanded metal sheet; and a textile fabric is provided around and contacting the perforated plate, woven wire mesh or expanded metal sheet, thereby providing the burner deck of the burner.
  • the textile fabric providing the burner deck can be the same textile fabric that provides the fabric section; or it can be a second, separate textile fabric.
  • the cylindrical premix gas burner is installed in the combustion chamber, such that when the burner is in cold condition, the fabric section of the textile fabric provides a seal along the circumference of the cylindrical shell between the end of the burner and the end wall of the combustion chamber.
  • the fabric section of the textile fabric is folded such that the seal is provided at least in part by a multiple number of layers (e.g. two layers) of the textile fabric.
  • the fold is made folding the fabric to the inside of the burner.
  • the heat exchanger is a sectional heat exchanger comprising a plurality of cast aluminium sections assembled into the heat exchanger.
  • Such heat exchangers are suited to build big heat cells that need to accommodate cylindrical premix gas burners of long length e.g. longer than 500 mm, or even longer than1000 mm or even longer than 2000 mm.
  • Heat cells according to the invention can be advantageously used in boilers, e.g. boilers used for central heating installations.
  • Figures 1 - 6 show sections through the central axis of examples of burners that can be used in the invention.
  • Figure 7 shows an example of a heat cell according to the invention.
  • FIG. 1 shows a section through the central axis of a first example of a cylindrical premix gas burner 100 that can be used in the invention.
  • the cylindrical premix gas burner 100 comprises a mixing chamber 102, a cylindrical shell 104 provided around the mixing chamber, an impervious end cap 106 provided at a first end of the cylindrical shell, an inlet 108 at the second end of the cylindrical shell provided for the supply of premix gas into the mixing chamber; and a textile fabric 1 10.
  • the inlet is provided by means of a flange 1 12.
  • the flange also allows mounting the burner in a heat exchanger to build a heat cell.
  • the end cap 106 closes the mixing chamber.
  • the end cap 106 is connected to the cylindrical shell by means of welds 120.
  • the end cap can be connected to the cylindrical shell by means of a crimped connection.
  • the end cap 106 is concave when observed from the outside of the burner.
  • the textile fabric 1 10 of the exemplary burner is a knitted fabric comprising yarns which comprise in their cross section a plurality of heat resistant metal fibers. Fabrics as disclosed in WO9704152A1 can be used in the invention.
  • the cylindrical shell comprises a perforated metal plate 1 14.
  • the perforations 1 16 of the perforated metal plate are covered by the textile fabric 1 10.
  • the textile fabric 1 10 provides the gas permeably burner deck onto which combustion is stabilized after premix gas has flown from the mixing chamber through the burner deck.
  • the textile fabric has along the circumference of the cylindrical shell a fabric section 1 18 extending freely at the side of the end cap in the length direction of the burner beyond the end of the cylindrical shell.
  • the length L of the cylindrical shell of the exemplary burner of figure 1 is 1000 mm.
  • the diameter D of the cylindrical burner of figure 1 is 300 mm.
  • the fabric section extends over a length I equal to 28 mm beyond the end of the cylindrical shell.
  • FIG. 2 shows a section through the central axis of a second example of a cylindrical premix gas burner 200 that can be used in the invention.
  • the cylindrical premix gas burner 200 comprises a mixing chamber 202, a cylindrical shell 204 provided around the mixing chamber, an impervious end cap 206 provided at a first end of the cylindrical shell, an inlet 208 at the second end of the cylindrical shell provided for the supply of premix gas into the mixing chamber; and a textile fabric 210.
  • the inlet is provided by means of a flange 212.
  • the end cap 206 closes the mixing chamber.
  • the end cap 206 is connected to the cylindrical shell by means of welds 220.
  • the end cap can be connected to the cylindrical shell by means of a crimped connection.
  • the end cap 206 is concave when observed from the outside of the burner.
  • the textile fabric 210 of the exemplary burner is a knitted fabric comprising yarns which comprise in their cross section a plurality of heat resistant metal fibers. Fabrics as disclosed in WO9704152A1 can be used in the invention.
  • the cylindrical shell comprises a perforated metal plate 214.
  • the perforations 216 of the perforated metal plate are covered by the textile fabric 210.
  • the textile fabric 210 provides the gas permeably burner deck onto which combustion is stabilized after premix gas has flown from the mixing chamber through the burner deck.
  • the textile fabric has along the circumference of the cylindrical shell a fabric section 218 extending freely at the side of the end cap in the length direction of the burner beyond the end of the cylindrical shell.
  • the freely extending fabric section of the textile fabric is folded over towards the inside of the burner, thereby creating an additional fabric layer 230, such that two fabric layers are provided to form the seal sealing the gas between the end of the cylindrical shell of the burner and the end wall of the heat exchanger in which the burner is installed.
  • the length L of the cylindrical shell of the exemplary burner of figure 1 is 1500 mm.
  • the diameter D of the cylindrical burner of figure 1 is 400 mm.
  • the fabric section extends over a length I equal to 20 mm beyond the end of the cylindrical shell.
  • FIG. 3 shows a section through the central axis of a third example of a cylindrical premix gas burner 300 as can be used in the invention.
  • the cylindrical premix gas burner 300 comprises a mixing chamber 302, a cylindrical shell 304 provided around the mixing chamber, an impervious end cap 306 provided at a first end of the cylindrical shell, an inlet 308 at the second end of the cylindrical shell provided for the supply of premix gas into the mixing chamber; and a textile fabric 310.
  • the inlet is provided by means of a flange 312. The flange also allows mounting the burner in a heat cell.
  • the end cap 306 closes the mixing chamber.
  • the end cap 306 is connected to the cylindrical shell by means of welds 320.
  • the end cap can be connected to the cylindrical shell by means of a crimped connection.
  • the end cap 306 is concave when observed from the outside of the burner.
  • the perforated metal plate acts as burner deck, as the flames are anchored onto the perforated metal plate after premix gas has flown from the mixing chamber through the perforations of the perforated metal plate; and ignition taking place after the premix gas has flown through the perforations of the perforated metal plate.
  • the textile fabric 310 of the exemplary burner is a knitted fabric comprising yarns which comprise in their cross section a plurality of heat resistant metal fibers. Fabrics as disclosed in WO9704152A1 can be used in the invention.
  • the fabric can be bonded onto the cylindrical shell 304 by means of welds.
  • the textile fabric has along the circumference of the cylindrical shell a fabric section 318 extending freely at the side of the end cap in the length direction of the burner beyond the end of the cylindrical shell.
  • the length L of the cylindrical shell of the exemplary burner of figure 1 is 1000 mm.
  • the diameter D of the cylindrical burner of figure 1 is 300 mm.
  • the fabric section extends over a length I equal to 20 mm beyond the end of the cylindrical shell.
  • FIG. 4 shows a section through the central axis of an example of a cylindrical premix gas burner 400 as can be used in the invention.
  • the cylindrical premix gas burner 400 comprises a mixing chamber 402, a cylindrical shell 404 provided around the mixing chamber, an impervious end cap 406 provided at a first end of the cylindrical shell, an inlet 408 at the second end of the cylindrical shell provided for the supply of premix gas into the mixing chamber; and a textile fabric 410.
  • the inlet is provided by means of a flange 412. The flange also allows mounting the burner in a heat exchanger to build a heat cell.
  • the end cap 406 closes the mixing chamber.
  • the end cap 406 is connected to the cylindrical shell by means of welds 420.
  • the end cap can be connected to the cylindrical shell by means of a crimped connection.
  • the end cap 406 is concave when observed from the outside of the burner.
  • the textile fabric 410 of the exemplary burner is a knitted fabric comprising yarns which comprise in their cross section a plurality of heat resistant metal fibers. Fabrics as disclosed in WO9704152A1 can be used in the invention.
  • the textile fabric 410 is fixed onto the inside of the rim 468 of the concave end cap, e.g. by spot welding or by means of adhesive.
  • the textile fabric 410 has along the circumference of the cylindrical shell a fabric section 418 extending freely at the side of the end cap in the length direction of the burner beyond the end of the cylindrical shell.
  • the cylindrical shell comprises a perforated metal plate 414.
  • the perforations 416 of the perforated metal plate are covered by a second textile fabric 470.
  • the second textile fabric 470 - e.g. as disclosed in WO9704152A1 - provides the gas permeably burner deck onto which combustion is stabilized after premix gas has flown from the mixing chamber through the burner deck.
  • FIG. 5 shows a section through the central axis of an example of a cylindrical premix gas burner 500 as can be used in the invention.
  • the cylindrical premix gas burner 500 comprises a mixing chamber 502, a cylindrical shell 504 provided around the mixing chamber, an impervious end cap 506 provided at a first end of the cylindrical shell, an inlet 508 at the second end of the cylindrical shell provided for the supply of premix gas into the mixing chamber.
  • the inlet is provided by means of a flange 512.
  • the flange also allows mounting the burner in a heat exchanger to build a heat cell.
  • the end cap 506 closes the mixing chamber.
  • the end cap 506 is connected to the cylindrical shell by means of welds 520. Alternatively, the end cap can be connected to the cylindrical shell by means of a crimped connection. In the example, the end cap 506 is concave when observed from the outside of the burner.
  • the burner comprises a textile fabric 570 providing the gas permeably burner deck onto which combustion is stabilized after premix gas has flown from the mixing chamber through the burner deck.
  • the textile fabric 570 is provided around a perforated cylindrical metal plate 514.
  • the perforations 516 of the perforated metal plate are covered by the textile fabric 570.
  • the burner further comprises a second textile fabric 510 which has along the
  • the folded over fabric section is provided by another textile fabric than the textile fabric providing the burner deck.
  • only one textile fabric is used and the textile fabric providing the burner deck is folded over and fixed - in the same way as the second textile fabric of figure 5 - to the inside of the rim of the concave end cap.
  • FIG. 6 shows a section through the central axis of an example of a cylindrical premix gas burner 600 as can be used in the invention.
  • the cylindrical premix gas burner 600 comprises a mixing chamber 602, a cylindrical shell 604 provided around the mixing chamber, an impervious end cap 606 provided at a first end of the cylindrical shell, and an inlet 608 at the second end of the cylindrical shell provided for the supply of premix gas into the mixing chamber.
  • the inlet is provided by means of a flange 612.
  • the flange also allows mounting the burner in a heat exchanger to build a heat cell.
  • the end cap 606 closes the mixing chamber.
  • the end cap 606 is connected to the cylindrical shell by means of welds 620.
  • the end cap 606 is concave when observed from the outside of the burner.
  • the cylindrical shell comprises a perforated metal plate 614.
  • the perforations 616 of the perforated metal plate are covered by a first textile fabric 670.
  • the first textile fabric 670 - e.g. as disclosed in WO9704152A1 - provides the gas permeably burner deck onto which combustion is stabilized after premix gas has flown from the mixing chamber through the burner deck.
  • the burner comprises a metal plate structure having a shape of a disc 666 with a rim 668.
  • the diameter of the disc is slightly smaller than the diameter of the end cap.
  • the disc 666 is fixed onto the end cap by means of one or more rivets 672.
  • other techniques can be used to fix the disc onto the end cap (e.g. by means of an adhesive).
  • Fixed (e.g. by means of welds) to the outside of the rim 668 is a textile fabric 610.
  • the textile fabric 610 provides along the circumference of the cylindrical shell a fabric section 618 extending freely at the side of the end cap in the length direction of the burner beyond the end of the cylindrical shell. The fabric section will provide a seal when the burner is installed in a heat exchanger.
  • FIG. 7 shows an example of a heat cell 700 according to the invention.
  • the heat cell 700 comprises a cylindrical premix gas burner 701 as in the first aspect of the invention (e.g. the burner of figure 1 ) and a heat exchanger 740.
  • the heat exchanger comprises a combustion chamber 742 having an end wall 744.
  • the cylindrical premix gas burner is installed in the combustion chamber, such that when the burner is in use, the fabric section 718 of the textile fabric 710 provides a seal along the circumference of the cylindrical shell between the end of the burner and the end wall of the combustion chamber.
  • the heat exchanger is a sectional heat exchanger comprising a plurality of cast aluminium sections assembled into the heat exchanger.
  • the sectional heat exchanger comprises two end segments 753, 754 and one or more intermediate segments 756 provided between the two end segments.
  • the intermediate segments and the two end segments are assembled in the heat exchanger.
  • the combustion chamber 742 is provided in the sectional heat exchanger, perpendicular to the one or more intermediate segments.
  • Each of the one or more intermediate segments comprises at least one flow channel 758 for a fluid to be heated.
  • a flow channel 760 for flue gas is present, wherein the flow channel extends from at the combustion chamber, allowing flue gas generated in the combustion chamber by the burner 701 to flow from the combustion chamber through the flow channels for flue gas.
  • the walls 762 of the intermediate segments and of the end segments between the flow channel for fluid to be heated and the flow channel for flue gas are provided with means, e.g. pins 764 extending from the walls into the flue gas channel to increase the heat transfer through the walls.

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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)

Abstract

L'invention concerne une source calorifique comprenant un brûleur à gaz à prémélange cylindrique et un échangeur de chaleur. Le brûleur à gaz à prémélange cylindrique comprend une chambre de mélange, une enveloppe cylindrique disposée autour de la chambre de mélange, un capuchon d'extrémité imperméable disposé au niveau d'une première extrémité de l'enveloppe cylindrique, une entrée au niveau de la seconde extrémité de l'enveloppe cylindrique pour l'alimentation en gaz de prémélange de la chambre de mélange; et une matière textile comprenant des fibres résistant à la chaleur. L'enveloppe cylindrique comprend une platine de brûleur perméable au gaz sur laquelle la combustion est stabilisée après écoulement du gaz de prémélange depuis la chambre de mélange et à travers la platine de brûleur. La matière textile comprend, le long de la circonférence de l'enveloppe cylindrique, une section de tissu se prolongeant librement du côté du capuchon d'extrémité dans la direction longitudinale du brûleur au-delà de l'extrémité de l'enveloppe cylindrique. L'échangeur de chaleur comprend une chambre de combustion comportant une paroi d'extrémité. Le brûleur à gaz à prémélange cylindrique est installé dans la chambre de combustion. La section de tissu de la matière textile est conçue pour assurer l'étanchéité le long de la circonférence de l'enveloppe cylindrique entre l'extrémité du brûleur et la paroi d'extrémité de la chambre de combustion lorsque le brûleur est utilisé.
PCT/EP2018/073726 2017-09-21 2018-09-04 Brûleur à gaz à prémélange cylindrique dans un échangeur de chaleur Ceased WO2019057483A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP17192296 2017-09-21
EP17192296.6 2017-09-21

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WO2019057483A1 true WO2019057483A1 (fr) 2019-03-28

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024208984A1 (fr) 2023-04-07 2024-10-10 Bekaert Combustion Technology B.V. Brûleur à gaz de prémélange pour la combustion d'un gaz de prémélange contenant de l'hydrogène ayant un élément d'insertion

Citations (8)

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US5355841A (en) * 1993-08-27 1994-10-18 Sabh (U.S.) Water Heater Group, Inc. Water heater with integral burner
WO1997004152A1 (fr) 1995-07-14 1997-02-06 N.V. Bekaert S.A. Tissu textile constitue de faisceaux de filaments metalliques usines
US6428312B1 (en) * 2000-05-10 2002-08-06 Lochinvar Corporation Resonance free burner
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WO2024208984A1 (fr) 2023-04-07 2024-10-10 Bekaert Combustion Technology B.V. Brûleur à gaz de prémélange pour la combustion d'un gaz de prémélange contenant de l'hydrogène ayant un élément d'insertion
NL2034527B1 (en) 2023-04-07 2024-10-14 Bekaert Combustion Tech Bv Premix gas burner for combusting a hydrogen-containing premix gas having an insertion element

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