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WO2010058180A2 - Ensemble brûleur radiant à gaz - Google Patents

Ensemble brûleur radiant à gaz Download PDF

Info

Publication number
WO2010058180A2
WO2010058180A2 PCT/GB2009/002724 GB2009002724W WO2010058180A2 WO 2010058180 A2 WO2010058180 A2 WO 2010058180A2 GB 2009002724 W GB2009002724 W GB 2009002724W WO 2010058180 A2 WO2010058180 A2 WO 2010058180A2
Authority
WO
WIPO (PCT)
Prior art keywords
assembly
radiant
air
casing
control means
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/GB2009/002724
Other languages
English (en)
Other versions
WO2010058180A3 (fr
Inventor
Michael Pollitt
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.)
ADVANCED COMBUSTION ENGINEERING Ltd
Original Assignee
ADVANCED COMBUSTION ENGINEERING Ltd
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 ADVANCED COMBUSTION ENGINEERING Ltd filed Critical ADVANCED COMBUSTION ENGINEERING Ltd
Priority to GB1108202A priority Critical patent/GB2479664A/en
Publication of WO2010058180A2 publication Critical patent/WO2010058180A2/fr
Anticipated expiration legal-status Critical
Publication of WO2010058180A3 publication Critical patent/WO2010058180A3/fr
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
    • F23D14/12—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
    • F23D14/46—Details
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/78—Cooling burner parts

Definitions

  • the present invention relates to a radiant gas burner assembly and, in particular, to such an assembly incorporating a metal fibre radiant.
  • Radiant gas burner assemblies that utilize a metal fibre mat as the permeable and/or perforated medium which forms the burner radiant have been known for some time.
  • the advantages of such mats is that they overcome the problems of slow heat up and cool down associated with other types of radiant, which also reduces the risk of fire in breakdown situations.
  • the low thermal mass and rapid heat dissipation characteristics of these mats provide a radiant surface which is cool enough to handle within seconds of the burner being turned off.
  • One or more such mats typically form the front face of a casing to the interior of which a gas/air mixture is supplied. The gas/air mixture permeates the mat and is combusted on the other side of the mat to the exterior of the casing.
  • Mats used in such burners are typically rectangular with dimensions up to 2000 mm long and up to 200 mm wide.
  • burner assemblies are in conveyor ovens where they mounted above the conveyor with the metal fibre radiants in a horizontal position to radiate heat downwards on to the articles to be baked that are transported through the oven on the conveyor.
  • the mounting of the burners in this position can cause problems as the air within the conveyor is also heated by the burner and this rises upwards around the casing of the burner and is lost from the interior of the oven.
  • the air flow around the casing heats it and over time can cause it to become distorted in shape to the extent that it may have to be replaced to prevent leakage of the air/gas fuel mixture into the body of the oven around the sides of the radiant mat.
  • An object of the present invention is to provide a radiant gas burner assembly that overcomes or substantially mitigates the aforementioned problems and that is suitable for use in a wide range of apparatus.
  • a radiant gas burner assembly comprising a casing defining a plenum to which a gas/air mixture can be supplied, a front face of the casing comprising a metal fibre radiant, a canopy located around the casing such that an air gap is defined between the casing and the canopy, and an air blowing means for blowing air through the air gap such that it issues from the air gap to form an air curtain around the radiant.
  • the assembly comprises a control means adapted to control the supply of gas/air mixture to the plenum, operation of the radiant and operation of the air blowing means.
  • the air blowing means comprises a first fan the operation of which is controlled by the control means.
  • the gas/ air mixture is supplied to the plenum by a second fan the operation of which is controlled by the control means.
  • control means controls speed of operation of the second fan whereby the temperature of the radiant is also varied.
  • a non-contact thermocouple linked to the control means is provided to detect the temperature of the area being heated and to transmit this information back to the control means which is operates to control operation of the second fan dependent on the temperature detected.
  • control means controls operation of the first fan independently of the operation of the second fan.
  • the radiant stands proud of the edge of the canopy defining the air gap around the periphery of the radiant.
  • an ignition electrode and an ionisation probe for the burner assembly are mounted such that they are cooled by air issuing through the air gap around the periphery of the radiant.
  • operation of the ignition electrode is controlled by the control means.
  • the ionisation probe is linked to operation of a gas valve controlling the gas supply to the plenum whereby in use the gas valve is closed if the ionisation probe does not detect the presence of a flame within the radiant.
  • the assembly preferably comprises a frame on which the casing is moveably mounted while the radiant is in operation, a drive means being provided to move the casing along the frame.
  • a drive means being provided to move the casing along the frame.
  • operation of the drive means is controlled by the control means.
  • the frame is made up of modular sections in order that its size can be varied as required.
  • the casing may also comprise a plurality of metal fibre radiants, each of which is independently operable with respect to the other or others.
  • Fig. i is a side elevation of a first embodiment of a radiant gas burner assembly in accordance with the present invention such as would be suitable for incorporation in an oven;
  • Fig. 2 is a view from below of the assembly shown in Fig. i;
  • Fig. 3 is a perspective view of a second embodiment of radiant gas burner assembly which is portable and suitable for use in road repair work.
  • a radiant gas burner assembly i comprises a casing 2 defining a plenum 3 to which a gas/ air mixture is supplied via pipework 4 from a pre-mix fan assembly 5.
  • the fan assembly 5 is linked to a gas supply 6 and comprises a gas valve 7, an air/gas mixing chamber 8 and a fan 9 which blows the air/gas mixture from the chamber 8 into the plenum 2.
  • the casing 2 comprises a rectangular box with a rear and side walls, 10 and 11 respectively, that are preferably made of stainless steel and a front face that comprises a metal fibre mat 12 which forms the radiant of the burner assembly 1.
  • the mat 12 is secured to the casing 2 by mountings (not shown) which are also preferably made of stainless steel.
  • a canopy 13 which is attached to the casing 2 by mountings 14 such that an air gap 15 is defined therebetween.
  • a fan 16 is provided for blowing air into the canopy 13 via pipework 17 such that this air issues from the air gap around the periphery of the radiant mat 12.
  • the radiant mat 12 stands proud of the edge 18 of the canopy 13 defining the air gap 15 around the periphery of the radiant mat 12. As the area of the radiant mat 12 is slightly larger that the area of the aperture in the casing 2 which is covered by it, this ensures that the airflow issuing from the canopy 13 is not impeded by the mat 12.
  • An ignition electrode 19 and ionisation probe 20 for the burner assembly 1 are mounted on the exterior of the canopy 13 adjacent one edge of the mat 12. In this way they are cooled by air issuing from the canopy 13.
  • the fan assembly 5, the fan 16 and the ignition electrode 19 are controlled by a control means (not shown) which opens and closes the gas valve 7 and fires up the burner assembly 1 via the ignition electrode 19 when desired.
  • the ionisation probe 20 is linked to the gas valve 7 controlling the gas supply to the plenum 2. A signal from the probe 20 is used to trigger closure of the gas valve 7 should no flame be detected with the radiant when the burner assembly 1 is in use.
  • the control means opens gas valve 7 and fires up the burner assembly 1 when desired by starting the fan 9 to blows an air/gas mixture to the plenum 3 where it permeates the mat 12, is ignited by the electrode 19 and combusted on the face of the mat 12 to the exterior of the plenum 3.
  • the ionisation probe 20 is used to detect that the gas is being combusted.
  • operation of the fan 16 is also commenced so that air is blown through the canopy 13.
  • operation of the fan 16 is preferably controlled by the control means separately from that of the first fan 9 so that its operation can be continued even after the burner has been switched off in order to cool the casing 2.
  • the air inlet for the fan 16 is to the exterior of any apparatus within which the burner assembly 1 is incorporated to prevent the recycling of hot air from within the apparatus.
  • This hot air which will contain combustion gases created when the gas/air mixture is combusted in the mat 12, is preferably removed from the apparatus by a suitable exhaust system (not shown) mounted above the casing 2.
  • the air passing through the air gap 15 created by the canopy 13 cools the casing 2 in order to reduce any tendency to lose its shape owing to the high temperatures created by the radiant mat 12.
  • the air flow issuing from the canopy 13 is directed downwards in the same direction as the radiant heat from the mat 12. This forms an air curtain around the radiant and creates forced convention currents within the apparatus such as an oven within which the burner assembly 1 is incorporated. These currents assist in the transfer of heat from the burner assembly 1 to the articles to be heated and the reduce stratification of the air between the face of the mat 12 and these articles, which tends to delay heat transfer.
  • a second embodiment of radiant gas burner assembly 20 shown in Fig. 3 is a portable assembly adapted for localized heating of an area such as part of a road surface.
  • a portable assembly 20 could incorporate a burner arrangement similar to that described above.
  • a housing 21 is split into a plurality of separate burner arrangements 22a, 22b, 22c each of which is similar to the casing 2 described above and comprises a plenum to which a gas/air mixture can be independently supplied via a pre-mix fan assembly 23 and its own metal fibre mat forming a radiant.
  • each arrangement 22a, 22b and 21c has its own gas valve so that a fan of the assembly 23 can blow the air/gas mixture from an air/gas mixing chamber into the relevant plenum dependent on which radiants are to be switched on.
  • Each of the burner arrangements 22a, 22b, 22c may also comprise its own ignition electrode and ionisation probe (not shown) that are again mounted so that they are cooled in the same way as in the first embodiment. It will be appreciated that any one, any two or all three of the burner arrangements 22a, 22b, 22c can be used as desired.
  • one of the burner arrangements 22a, 22b, 22c may be used to ignite the other two so that only one ignition electrode and ionisation probe will be required. In this modification either said one or all three of the burner arrangements 22a, 22b, 22c are ignited at any one time.
  • the fan assembly 23 is linked to a gas supply 24, which in this embodiment comprises a bottled gas supply such as bottled liquefied petroleum gas (LPG) or an equivalent rather than a mains gas supply.
  • a gas supply 24 which in this embodiment comprises a bottled gas supply such as bottled liquefied petroleum gas (LPG) or an equivalent rather than a mains gas supply.
  • LPG bottled liquefied petroleum gas
  • the housing 21 forms a single canopy defining an air gap around all of the burner arrangements 22a, 22b, 22c and a fan 25 mounted on top of the housing 21 is provided for blowing air into this gap.
  • operation of the fan assembly 23, the fan 25 and the ignition electrodes is controlled by a control means 26 which in this embodiment is powered by a generator 27.
  • the control means 26 could be adapted to be powered by a mains electrical supply.
  • thermocouple 28 Mounted on the exterior of the housing 21 is a non-contact thermocouple 28 that is also linked to the control means 26.
  • the thermocouple is orientated to detect the temperature of the area being heated and adapted to transmit this information back to the control means 26.
  • the control means 26 is adapted to automatically control operation of the fan assembly 23 dependent on the temperature detected so that the area reaches the desired temperature quickly but is not over-heated.
  • a thermocouple could be included in the first embodiment shown in Figs. 1 and 2 if desired.
  • the burner arrangements 22a, 22b and 22c each operate in the same manner as that described above with reference to Figs. 1 and 2.
  • the fan assembly 23 and ignition electrodes are controlled by the control means 26 which opens the appropriate gas valve or valves and fires up the appropriate arrangement 22a, 22b, 22c when desired, the ionisation probe or probes being used to detect the presence of a flame.
  • the housing 21 and burner arrangements 22a, 22b and 22c are moveably mounted on a frame 29, for example on rails (not shown) in order that they can be reciprocated to and fro along the frame 29 while the burner arrangements 22a, 22b and 22c are in operation.
  • a drive means 30 comprising a motor powered by the generator 27, a gearbox and a pinion drive system is provided to move the housing 21 along the frame 29.
  • the frame 29 is preferably modular so that additional frame sections 31 can be added to increase its length as desired dependent on the total surface area it is desired to heat.
  • the assembly 20 is transported to the appropriate location and erected over the relevant part of the road surface with the modular frame 29 made large enough to cover it.
  • the control means 26 is set up to heat the relevant area, an operator programming it so that all or some of the relevant burner arrangements 22a, 22b, 22c will be deployed to heat only that portion of the road surface which requires repair.
  • the housing 21 is moved to and fro over the road surface by the drive means 30 so that the area to be repaired is evenly heated. Patching of the road surface can then be accomplished in a conventional manner and, if necessary, the patching material can also heated and cured using the assembly 20.
  • the control means 26 controls operation of the fan assembly 23 dependent on the data received from the thermocouple 28 to give controlled heating of the area of the road surface being repaired.
  • the air passing through the air gap defined by the housing 21 cools the burner arrangements 22a, 22b, 22c.
  • the air flow issuing from the housing 21 is directed downwards in the same direction as the radiant heat from the arrangements 22a, 22b, 22c. This forms an air curtain around the area being heated to contain the heat within the confines of the curtain. This significantly reduces loss of heat to the environment and makes the heating process more efficient.

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 concerne un ensemble brûleur radiant à gaz (l; 20) comportant un carter (2; 22a-22c) définissant un plénum (3) dans lequel un mélange gaz/air peut être alimenté. Une face avant du carter (2) comporte un panneau radiant en fibres métalliques (12). Un capot (13; 21) est situé autour du carter (2; 22a, 22b, 22c) de sorte qu'un intervalle d'air (15) est défini entre le carter (2; 22a, 22b, 22c) et le capot (13). Des moyens (16) sont mis en œuvre pour souffler de l'air au travers de l'intervalle d’air (15) à des fins d’émission depuis l'intervalle d'air (15) pour former un rideau d'air autour du panneau radiant (12). Dans certains modes de réalisation, l'ensemble (1) est adapté à des fins d'incorporation dans un appareil tel un four. Dans d'autres modes de réalisation, l'ensemble (20) est adapté pour être portable et peut comporter un cadre (29) le long duquel le capot (21) et le carter (22a, 22b, 22c) sont montés de manière mobile par un moyen d'entraînement (30).
PCT/GB2009/002724 2008-11-21 2009-11-20 Ensemble brûleur radiant à gaz Ceased WO2010058180A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1108202A GB2479664A (en) 2008-11-21 2009-11-20 A radiant gas burner assembly

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0821260.7 2008-11-21
GBGB0821260.7A GB0821260D0 (en) 2008-11-21 2008-11-21 A radiant gas burner assembly

Publications (2)

Publication Number Publication Date
WO2010058180A2 true WO2010058180A2 (fr) 2010-05-27
WO2010058180A3 WO2010058180A3 (fr) 2011-10-06

Family

ID=40230593

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2009/002724 Ceased WO2010058180A2 (fr) 2008-11-21 2009-11-20 Ensemble brûleur radiant à gaz

Country Status (2)

Country Link
GB (2) GB0821260D0 (fr)
WO (1) WO2010058180A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012016812A1 (fr) * 2010-08-04 2012-02-09 Robert Bosch Gmbh Dispositif brûleur à manchon de chambre de combustion
CN103157930A (zh) * 2013-03-20 2013-06-19 上海锅炉厂有限公司 一种管排预热装置

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU419183B2 (en) * 1967-06-20 1971-11-25 Caloric Corporation Infra red ray generating space heater
US3805763A (en) * 1972-08-21 1974-04-23 E Cowan Flush-mountable, self-cooling gas-fired heater
US4255123A (en) * 1979-05-11 1981-03-10 Slyman Manufacturing Corporation Non-warping radiant burner construction
JPS57207716A (en) * 1981-06-16 1982-12-20 Nippon Steel Corp Method of removing heat in surface combustor
US4634373A (en) * 1985-09-24 1987-01-06 David Rattner Gas-fired radiant heater
GB9707396D0 (en) * 1997-04-11 1997-05-28 Jones Philomena J Heaters
US6190162B1 (en) * 1999-02-11 2001-02-20 Marsden, Inc. Infrared heater and components thereof
DE10028669A1 (de) * 2000-06-09 2001-12-13 Ruhrgas Ag Verfahren und Vorrichtung zum Erwärmen von flächigem Material
US6827079B2 (en) * 2002-02-26 2004-12-07 Solaronics, Inc. Apparatus and method for reducing peak temperature hot spots on a gas fired infrared industrial heater
DE10233340B4 (de) * 2002-07-23 2004-07-15 Rational Ag Porenbrenner sowie Gargerät, enthaltend mindestens einen Porenbrenner
US6971871B2 (en) * 2004-02-06 2005-12-06 Solaronics, Inc. Variable low intensity infrared heater

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012016812A1 (fr) * 2010-08-04 2012-02-09 Robert Bosch Gmbh Dispositif brûleur à manchon de chambre de combustion
CN103157930A (zh) * 2013-03-20 2013-06-19 上海锅炉厂有限公司 一种管排预热装置

Also Published As

Publication number Publication date
GB201108202D0 (en) 2011-06-29
GB0821260D0 (en) 2008-12-31
WO2010058180A3 (fr) 2011-10-06
GB2479664A (en) 2011-10-19

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