WO2007113186A1 - Burner - Google Patents

Burner Download PDF

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Publication number
WO2007113186A1
WO2007113186A1 PCT/EP2007/052962 EP2007052962W WO2007113186A1 WO 2007113186 A1 WO2007113186 A1 WO 2007113186A1 EP 2007052962 W EP2007052962 W EP 2007052962W WO 2007113186 A1 WO2007113186 A1 WO 2007113186A1
Authority
WO
WIPO (PCT)
Prior art keywords
combustion chamber
burner
section
interspace
air
Prior art date
Application number
PCT/EP2007/052962
Other languages
French (fr)
Inventor
Rinaldo Annovi
Original Assignee
Nbp S.R.L.
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 Nbp S.R.L. filed Critical Nbp S.R.L.
Priority to CN2007800153772A priority Critical patent/CN101438100B/en
Priority to EP07727434A priority patent/EP2008022A1/en
Publication of WO2007113186A1 publication Critical patent/WO2007113186A1/en

Links

Classifications

    • 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 
    • F23C3/00—Combustion apparatus characterised by the shape of the combustion chamber
    • F23C3/002—Combustion apparatus characterised by the shape of the combustion chamber the chamber having an elongated tubular form, e.g. for a radiant tube
    • 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 
    • F23C7/00—Combustion apparatus characterised by arrangements for air supply
    • F23C7/02—Disposition of air supply not passing through burner
    • F23C7/04—Disposition of air supply not passing through burner to obtain maximum heat transfer to wall of combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/36—Details, e.g. burner cooling means, noise reduction means
    • F23D11/40—Mixing tubes or chambers; Burner heads
    • F23D11/404—Flame tubes
    • 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
    • F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
    • F23D14/22—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L15/00—Heating of air supplied for combustion
    • 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
    • F23C2900/03005—Burners with an internal combustion chamber, e.g. for obtaining an increased heat release, a high speed jet flame or being used for starting the combustion
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Definitions

  • the invention relates to a burner, particularly a burner for industrial ovens, such as ceramic ovens, ovens for baking tableware, ovens for firing sanitary fixtures, ovens for bricks .
  • burners for industrial ovens comprising a burner body inside which a combustion chamber is defined, in which a fuel and air are introduced and mixed and the combustion of the so formed mixture occurs.
  • the combustion chamber comprises a tubular element that is designed to protrude into the oven.
  • an immersion burner for heating a liquid placed inside a tank.
  • This burner comprises a burner body inside which a combustion chamber exists having the shape of a truncated cone, into which a fuel and air are introduced and mixed, to form a mixture, the combustion of which is produced inside said combustion chamber.
  • the fuel is introduced into the combustion chamber through a nozzle arranged substantially on the longitudinal axis of the combustion chamber.
  • Air is introduced into the burner body through an opening made in a side wall of said body and passes through an interspace existing between the burner body and the combustion chamber, before being introduced into said combustion chamber.
  • the combustion chamber terminates, at a smaller diameter end thereof, with an exhaust opening, through which the combustion products of the fuel and air mixture are discharged.
  • the exhaust opening is connected with a tube, which is immersed within the tank containing the liquid to be heated.
  • Burners known from the prior art exhibits an unsatisfactory efficiency since a non negligible part of the heat produced by the combustion of the air and fuel mixture is designed to heat the air composing the mixture, which is introduced into the combustion chamber substantially at room temperature. This produces a flame temperature remarkably lower than the temperature theoretically obtainable, with consequent decrease of the amount of heat that can be exchanged with the material to be heated within the oven, or with the liquid in the tank, in the case of the burner described in US patent 6, 050, 809.
  • the object of the present invention is to improve the efficiency of a burner for industrial ovens.
  • a burner comprising a burner body, a combustion chamber into which a fuel means and air are introduced, first introducing means for introducing said fuel means into said combustion chamber, second introducing means for introducing said air into said body, through an opening of said body, characterized in that between the burner body and a first section of said combustion chamber an intermediate hollow body is interposed, which surrounds, at least for a portion of its length, said first section of the combustion chamber.
  • the air introduced into the burner body, before being introduced into the combustion chamber passes in a first interspace defined between the burner body and said intermediate body and, subsequently, in a second interspace defined between the combustion chamber and the intermediate body.
  • the air warms up due to the heat passing into said interspaces through the combustion chamber walls and is introduced into the combustion chamber at a temperature remarkably higher than the room temperature. That enables a higher flame temperature to be obtained, which makes more effective the heat transmission to the products that are present within the oven so improving the burner efficiency.
  • Figure 1 is a longitudinal section of a burner according to the invention
  • Figure 2 is a view from the left of the burner in Figure 1;
  • Figure 3 is a top view of the burner in Figure 1.
  • a burner 1 comprises a burner body 2 provided with a flange F for fixing to the oven wall.
  • a combustion chamber 3 is fixed comprising a first section 3a, having a hollow truncated cone shape, a second section 3b, having a substantially hollow cylinder shape and a diameter equal to the minimal diameter of the truncated cone shaped section 3a, and a third section 3c having a hollow truncated cone shape, with a first end 4a connected with the second section 3b and having a diameter equal to the diameter of the second section 3b, and a second end 4b having a diameter lower than the diameter of the end 4a and extending in a short cylindrical section.
  • the second section 3b and the third section 3c are designed to be inserted in a through hole made in the wall of an oven, so that the end 4b communicates with the interior of the oven, or protrudes into said oven.
  • the first section 3a of the combustion chamber 3 is surrounded, for a portion of the length thereof, by an intermediate hollow body 5, for example a cylindrical body, interposed between the combustion chamber 3 and the burner body 2.
  • a first interspace 6 is defined between the cylindrical hollow body 5 and the body 2 of the burner 1.
  • a second interspace 7 is defined between the cylindrical hollow body 5 and the first section 3a of the combustion chamber 3.
  • annular passage 8 is defined between the end 5a of the cylindrical hollow body 5 facing the flange 3 and the first section 3a of the combustion chamber 3 making the first interspace 6 and the second interspace 7 communicate with each other.
  • the interspaces 6 and 7 are heated by heat coming from the combustion chamber through the walls of said chamber.
  • the burner body 2 is provided with an opening 9 communicating with an air inlet conduit 10.
  • the path of the air from the conduit 10 to the combustion chamber 3 is highlighted by means of arrows in Figure 1.
  • the air introduced through the conduit 10 absorbs heat and warms up so that its temperature when it enters the combustion chamber is remarkably higher than the room temperature. From tests performed by the applicant the efficiency of a burner according to the invention proved to exceed the efficiency of a burner according to the prior art up to about 16%.
  • the fuel is introduced into the combustion chamber through a nozzle 13, substantially aligned with the longitudinal axis of the combustion chamber and mixed with the air coming from the distributor element 12.
  • the ignition of the mixture is obtained by means of ignition means 14, arranged into the combustion chamber.

Landscapes

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

Abstract

A burner (1) comprising a burner body (2), a combustion chamber (3) into which a fuel means and air are introduced, first introducing means (13) for introducing said fuel means into said combustion chamber, second introducing means (10) for introducing said air into said body (2), through an opening (9) of said body (2); between the burner body (2) and a first section (3a) of said combustion chamber (3) an intermediate hollow body (5) is interposed, surrounding, for at least a portion of the length thereof, said first section (3a).

Description

Burner
The invention relates to a burner, particularly a burner for industrial ovens, such as ceramic ovens, ovens for baking tableware, ovens for firing sanitary fixtures, ovens for bricks .
In the prior art burners for industrial ovens are known comprising a burner body inside which a combustion chamber is defined, in which a fuel and air are introduced and mixed and the combustion of the so formed mixture occurs. The combustion chamber comprises a tubular element that is designed to protrude into the oven.
From US 6,050,809 an immersion burner is known for heating a liquid placed inside a tank. This burner comprises a burner body inside which a combustion chamber exists having the shape of a truncated cone, into which a fuel and air are introduced and mixed, to form a mixture, the combustion of which is produced inside said combustion chamber. The fuel is introduced into the combustion chamber through a nozzle arranged substantially on the longitudinal axis of the combustion chamber. Air is introduced into the burner body through an opening made in a side wall of said body and passes through an interspace existing between the burner body and the combustion chamber, before being introduced into said combustion chamber. The combustion chamber terminates, at a smaller diameter end thereof, with an exhaust opening, through which the combustion products of the fuel and air mixture are discharged. The exhaust opening is connected with a tube, which is immersed within the tank containing the liquid to be heated.
Burners known from the prior art exhibits an unsatisfactory efficiency since a non negligible part of the heat produced by the combustion of the air and fuel mixture is designed to heat the air composing the mixture, which is introduced into the combustion chamber substantially at room temperature. This produces a flame temperature remarkably lower than the temperature theoretically obtainable, with consequent decrease of the amount of heat that can be exchanged with the material to be heated within the oven, or with the liquid in the tank, in the case of the burner described in US patent 6, 050, 809. The object of the present invention is to improve the efficiency of a burner for industrial ovens.
According to the present invention a burner is provided comprising a burner body, a combustion chamber into which a fuel means and air are introduced, first introducing means for introducing said fuel means into said combustion chamber, second introducing means for introducing said air into said body, through an opening of said body, characterized in that between the burner body and a first section of said combustion chamber an intermediate hollow body is interposed, which surrounds, at least for a portion of its length, said first section of the combustion chamber.
Owing to the presence of the intermediate body, the air introduced into the burner body, before being introduced into the combustion chamber passes in a first interspace defined between the burner body and said intermediate body and, subsequently, in a second interspace defined between the combustion chamber and the intermediate body. Along this path through the two interspaces the air warms up due to the heat passing into said interspaces through the combustion chamber walls and is introduced into the combustion chamber at a temperature remarkably higher than the room temperature. That enables a higher flame temperature to be obtained, which makes more effective the heat transmission to the products that are present within the oven so improving the burner efficiency.
Also in the burner disclosed in US 6,050,809 the air introduced into the burner body warms up in a certain amount, passing through the interspace existing between the burner body and the combustion chamber. However, in the burner according to the invention, the path made by the air passing through the two interspaces existing between the intermediate body and the burner body and between the intermediate body and the combustion chamber, is much longer than the path the air has to cover in a burner according to US 6,050,809 before entering the combustion chamber. This implies that in a burner according to the invention the heat amount absorbed by the air, before entering into the combustion chamber, is remarkably higher than in a burner according to US 6,050,809. Consequently, in a burner according to the invention, the air enters the combustion chamber at a remarkably higher temperature, which enables a higher flame temperature to be obtained, with consequent improvement of the heat exchange inside the oven.
In the enclosed drawing table, an exemplifying and not limitative embodiment of the invention is disclosed, by way of example only, wherein:
Figure 1 is a longitudinal section of a burner according to the invention;
Figure 2 is a view from the left of the burner in Figure 1; Figure 3 is a top view of the burner in Figure 1.
A burner 1 according to the invention comprises a burner body 2 provided with a flange F for fixing to the oven wall. Within the body 2 a combustion chamber 3 is fixed comprising a first section 3a, having a hollow truncated cone shape, a second section 3b, having a substantially hollow cylinder shape and a diameter equal to the minimal diameter of the truncated cone shaped section 3a, and a third section 3c having a hollow truncated cone shape, with a first end 4a connected with the second section 3b and having a diameter equal to the diameter of the second section 3b, and a second end 4b having a diameter lower than the diameter of the end 4a and extending in a short cylindrical section. The second section 3b and the third section 3c are designed to be inserted in a through hole made in the wall of an oven, so that the end 4b communicates with the interior of the oven, or protrudes into said oven. The first section 3a of the combustion chamber 3 is surrounded, for a portion of the length thereof, by an intermediate hollow body 5, for example a cylindrical body, interposed between the combustion chamber 3 and the burner body 2. A first interspace 6 is defined between the cylindrical hollow body 5 and the body 2 of the burner 1. A second interspace 7 is defined between the cylindrical hollow body 5 and the first section 3a of the combustion chamber 3. Between the end 5a of the cylindrical hollow body 5 facing the flange 3 and the first section 3a of the combustion chamber 3 an annular passage 8 is defined making the first interspace 6 and the second interspace 7 communicate with each other. The interspaces 6 and 7 are heated by heat coming from the combustion chamber through the walls of said chamber.
The burner body 2 is provided with an opening 9 communicating with an air inlet conduit 10. The air introduced through the conduit 10 and the opening 9 enters the first interspace 6, passes through the annular opening 8 entering the second interspace and is finally introduced in the combustion chamber 3 through openings 11 made in the combustion chamber wall and a distributor element 12 inserted into said combustion chamber. The path of the air from the conduit 10 to the combustion chamber 3 is highlighted by means of arrows in Figure 1. Along said path, the air introduced through the conduit 10 absorbs heat and warms up so that its temperature when it enters the combustion chamber is remarkably higher than the room temperature. From tests performed by the applicant the efficiency of a burner according to the invention proved to exceed the efficiency of a burner according to the prior art up to about 16%.
The fuel is introduced into the combustion chamber through a nozzle 13, substantially aligned with the longitudinal axis of the combustion chamber and mixed with the air coming from the distributor element 12. The ignition of the mixture is obtained by means of ignition means 14, arranged into the combustion chamber.
In the practical embodiment, materials, dimensions and execution details may be different from those indicated, but technically equivalent thereto, without departing thereupon from the juridical domain of the present invention.

Claims

1. Burner (1) comprising a burner body (2), a combustion chamber (3) into which a fuel means and air are introduced, first introducing means (13) for introducing said fuel means into said combustion chamber, second introducing means (10) for introducing said air into said body (2), through an opening (9) of said body (2), characterized in that between the burner body (2) and a first section (3a) of said combustion chamber (3) an intermediate hollow body (5) is interposed, surrounding, for at least a portion of the length thereof, said first section (3a) .
2. Burner according to claim 1, wherein said first section (3a) has a substantially truncated cone shape and is connected at an end of smaller diameter thereof with a second section (3b) of the combustion chamber (3) having substantially cylindrical shape, a third section (3c) of the combustion chamber (3) having truncated cone shape being connected with said second section (3b) .
3. Burner according to claim 1, or 2, wherein said intermediate body (5) has a substantially cylindrical shape.
4. Burner according to any of claims 1 to 3, wherein between said burner body (2) and said intermediate body (5) a first interspace (6) is defined.
5. Burner according to claim 4, wherein said first interspace (6) communicates with said introducing means (10) through said opening (9) .
6. Burner according to claim 4, or 5, wherein between said intermediate body (5) and said first section (3a) of the combustion chamber (3) a second interspace (7) is defined.
7. Burner according to claim 6, wherein between an end
(5a) of said intermediate body (5) and said first portion
(3a) of the combustion chamber (3) a passage (8) is defined making said first interspace (6) communicate with said second interspace (7) .
8. Burner according to any of claims 3 to 7, wherein said first portion (3a) of the combustion chamber (3) is provided with openings (11) making said second interspace (7) communicate with a distributor element (12) of said air, said distributor element (12) communicating with said combustion chamber (3) .
9. Burner according to any of the preceding claims, wherein said first introducing means comprises nozzle means
(13) .
10. Burner according to any of the preceding claims, further comprising ignition means (14) suitable for causing the combustion of said mixture within said combustion chamber
(3) .
PCT/EP2007/052962 2006-03-31 2007-03-28 Burner WO2007113186A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2007800153772A CN101438100B (en) 2006-03-31 2007-03-28 Burner
EP07727434A EP2008022A1 (en) 2006-03-31 2007-03-28 Burner

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMO2006A000110 2006-03-31
IT000110A ITMO20060110A1 (en) 2006-03-31 2006-03-31 BURNER

Publications (1)

Publication Number Publication Date
WO2007113186A1 true WO2007113186A1 (en) 2007-10-11

Family

ID=38226656

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/052962 WO2007113186A1 (en) 2006-03-31 2007-03-28 Burner

Country Status (4)

Country Link
EP (1) EP2008022A1 (en)
CN (1) CN101438100B (en)
IT (1) ITMO20060110A1 (en)
WO (1) WO2007113186A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1918639A2 (en) 2006-10-30 2008-05-07 J. Eberspächer GmbH & Co. KG Burner unit
EP2813683A1 (en) * 2013-06-13 2014-12-17 Delavan Inc. Continuous ignition systems
EP2813684A1 (en) * 2013-06-13 2014-12-17 Delavan Inc. Continuous ignition
WO2016016817A1 (en) 2014-07-29 2016-02-04 Nbp S.R.L. Burner

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105782971B (en) * 2016-04-27 2018-11-13 广州宇能新能源科技有限公司 The pre- burner of highly effective energy-conserving environmental-protecting type
CN108534179A (en) * 2018-06-08 2018-09-14 哈尔滨工业大学 Burner
CN110207147B (en) * 2019-05-27 2024-04-12 永能动力（北京）科技有限公司 Dry-type low-nitrogen combustion chamber

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19705552A1 (en) * 1997-02-14 1998-08-20 Alpro Aluminium Processing Gmb Gas or oil burner
US6050809A (en) * 1997-09-23 2000-04-18 Eclipse Combustion, Inc. Immersion tube burner with improved flame stability
US20050048426A1 (en) * 2003-08-25 2005-03-03 Kinosihta Tatsumi Gasification burner using high-pressure swirled air

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3634325B2 (en) * 2002-05-30 2005-03-30 住重機器システム株式会社 Supersonic jet burner

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19705552A1 (en) * 1997-02-14 1998-08-20 Alpro Aluminium Processing Gmb Gas or oil burner
US6050809A (en) * 1997-09-23 2000-04-18 Eclipse Combustion, Inc. Immersion tube burner with improved flame stability
US20050048426A1 (en) * 2003-08-25 2005-03-03 Kinosihta Tatsumi Gasification burner using high-pressure swirled air

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1918639A2 (en) 2006-10-30 2008-05-07 J. Eberspächer GmbH & Co. KG Burner unit
EP1918639A3 (en) * 2006-10-30 2008-12-17 J. Eberspächer GmbH & Co. KG Burner unit
EP2813683A1 (en) * 2013-06-13 2014-12-17 Delavan Inc. Continuous ignition systems
EP2813684A1 (en) * 2013-06-13 2014-12-17 Delavan Inc. Continuous ignition
US9080772B2 (en) 2013-06-13 2015-07-14 Delavan Inc Continuous ignition
US9567912B2 (en) 2013-06-13 2017-02-14 Delavan Inc Continuous ignition systems
WO2016016817A1 (en) 2014-07-29 2016-02-04 Nbp S.R.L. Burner

Also Published As

Publication number Publication date
EP2008022A1 (en) 2008-12-31
CN101438100A (en) 2009-05-20
CN101438100B (en) 2011-11-16
ITMO20060110A1 (en) 2007-10-01

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