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EP1370800A1 - Radiant tube gas burner - Google Patents

Radiant tube gas burner

Info

Publication number
EP1370800A1
EP1370800A1 EP02704026A EP02704026A EP1370800A1 EP 1370800 A1 EP1370800 A1 EP 1370800A1 EP 02704026 A EP02704026 A EP 02704026A EP 02704026 A EP02704026 A EP 02704026A EP 1370800 A1 EP1370800 A1 EP 1370800A1
Authority
EP
European Patent Office
Prior art keywords
pipe
burner
separate
inner pipe
gas burner
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.)
Withdrawn
Application number
EP02704026A
Other languages
German (de)
French (fr)
Inventor
Hans LÖVGREN
Thomas Lewin
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.)
Sandvik AB
Original Assignee
Sandvik AB
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 Sandvik AB filed Critical Sandvik AB
Publication of EP1370800A1 publication Critical patent/EP1370800A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • 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
    • F23D14/126—Radiant burners cooperating with refractory wall surfaces
    • 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, e.g. noise reduction means
    • F23D14/66—Preheating the combustion air or gas
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/00018—Means for protecting parts of the burner, e.g. ceramic lining outside of the flame tube
    • 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
    • F23L2900/00—Special arrangements for supplying or treating air or oxidant for combustion; Injecting inert gas, water or steam into the combustion chamber
    • F23L2900/15043—Preheating combustion air by heat recovery means located in the chimney, e.g. for home heating devices
    • 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 present invention relates to a gas burner.
  • the invention is primarily intended for industrial furnaces.
  • Swedish Patent Specification No. 9800473-2 describes a method and a burner for cleaning waste gases emitted from a gas burner or from some other combustion source, such as oil- fired burners.
  • the fuel normally used is natural gas, although other gases may be used, such as propane, butane and liquefied petroleum gas or bottled gas.
  • An example of an efficient gas burner is a burner of the type in which the burner head is placed at one end of an inner pipe and in which the inner pipe is surrounded by an outer protective pipe which is closed at its bottom.
  • the combustion gases from the combustion chamber pass down inside the inner pipe to the bottom of the outer pipe, where they turn to flow back between the outer pipe and the inner pipe and into a waste gas channel which leads to the surroundings.
  • the protective pipe delivers heat to a furnace space by convection, corresponding to 30%, and by radiation, corresponding to 70%.
  • a similar type of burner also comprises an inner pipe and an outer protective pipe that surrounds the inner pipe, although the bottom of the protective pipe is not closed in this case.
  • the protective pipe is curved, for instance in a U-shaped configuration, and the free end of the protective pipe is connected to a waste gas channel.
  • the inner pipe equipped with the burner head is straight and is thus located within the straight section of the protective pipe.
  • the outer pipe It is desirable to keep the outer pipe at a temperature of up to 1150-1200°C, so as to thereby enhance the power concentration of the burner.
  • This can be achieved by producing the outer pipe from a high temperature material, such as silicon carbide (SiC) or APM.
  • SiC silicon carbide
  • APM is an acronym of Advanced Powder Metallurgy, and the material concerned contains about 73% Fe, 22% Cr and 5% Al.
  • the powder material is extruded into a tubular form.
  • One problem is that when the flame leaves the burner head and comes into contact with the inner pipe, there is formed a region in which the temperature of the inner pipe tends to become too high on relation to the temperature at which the inner pipe is intended to operate.
  • the present invention solves this problem.
  • the present invention thus relates to a furnace-heating gas burner of the kind in which the burner head 1 is situated at one end of an inner pipe which is surrounded by an outer protective pipe and wherein a first part of the inner pipe that surrounds the burner head is provided, and wherein a separate inner pipe is provided in the extension of the first pipe which separate inner pipe lies axially in line with the first pipe and commences at the open end thereof, and wherein the burner is characterised in that the outlet of the first pipe has an inner diameter which is smaller than the remainder of the pipe at the end of said first pipe that faces towards the separate pipe.
  • Figure 1 illustrates a known type of gas burner for heating furnaces.
  • the gas burner is of the kind in which the burner head 1 is situated at one end of an inner pipe 2, which is surrounded by an outer protective pipe 3.
  • the bottom 4 of the protective pipe 3 is closed.
  • the waste gases from the burner head will pass down inside the inner pipe 2 to the bottom 4 of the outer pipe 3 and then turn to flow back between the outer pipe and the inner pipe, as shown by the arrows, and thereafter flow into an exhaust channel 5 that leads to the surroundings.
  • Figure 1 shows a first part 2 of the inner pipe that surrounds the burner head, and also shows a separate inner pipe 8 situated in the extension of the inner pipe 2.
  • This separate inner pipe 8 is axially in line with the first pipe and commences at the open end of the first pipe 2.
  • the first pipe 2 and the separate inner pipe 8 are thus axially in line with each other.
  • the separate inner pipe 8 commences at the open end of the first pipe 2.
  • the invention is not restricted to any particular gas burner or to any other type of burner, but may equally as well have been described with reference to the above-mentioned type of burner, which also has an inner pipe that is surrounded by an outer protective pipe, but where the bottom of the protective pipe is not closed but where the protective pipe is curved and the free end of said pipe is connected to a waste gas channel.
  • Gaseous fuel is fed into an inlet 6 and air of combustion is fed into an inlet 7.
  • the outlet of the first pipe has a smaller inner diameter than the remainder of the tube at that end which faces towards the separate pipe.
  • the first pipe 2 narrows at its lower end.
  • the tapering part 9 causes the speed of the gas to increase towards the mouth 10.
  • the longer flame means that the area of the inner surface of the separate pipe that is heated directly by the flame, i.e. the surface area contacted by the flame, will be much greater than in the case of conventional burners.
  • the smaller inner diameter of the mouth 10 is 10% to 50% of the inner diameter of the remainder of the pipe.
  • the mouth 10 of the first pipe 2 is located essentially at the proximal opening 12 of the separate pipe 8.

Landscapes

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

Abstract

A furnace-heating gas burner of the kind in which the burner head (1) is situated at one end of an inner pipe (2) which is surrounded by an outer protective pipe (3), and where a first part of the inner tube (2) that surrounds the burner head is provided, and wherein a separate inner pipe (8) is provided in the extension of the first pipe (2), which separate inner pipe (8) lies axially in line with the first pipe and commences at the open end of said first pipe (2). The invention is characterised in that at the end of the first pipe (2) which faces towards the separate pipe (8), the outlet of said first pipe has an inner diameter which is smaller than the diameter of the pipe in general.

Description

Rad i ant tube gas burner
The present invention relates to a gas burner.
The invention is primarily intended for industrial furnaces.
Swedish Patent Specification No. 9800473-2 describes a method and a burner for cleaning waste gases emitted from a gas burner or from some other combustion source, such as oil- fired burners.
It is usual to heat industrial furnaces with the aid of gas burners. The fuel normally used is natural gas, although other gases may be used, such as propane, butane and liquefied petroleum gas or bottled gas.
An example of an efficient gas burner is a burner of the type in which the burner head is placed at one end of an inner pipe and in which the inner pipe is surrounded by an outer protective pipe which is closed at its bottom. The combustion gases from the combustion chamber pass down inside the inner pipe to the bottom of the outer pipe, where they turn to flow back between the outer pipe and the inner pipe and into a waste gas channel which leads to the surroundings. The protective pipe delivers heat to a furnace space by convection, corresponding to 30%, and by radiation, corresponding to 70%.
A similar type of burner also comprises an inner pipe and an outer protective pipe that surrounds the inner pipe, although the bottom of the protective pipe is not closed in this case. The protective pipe is curved, for instance in a U-shaped configuration, and the free end of the protective pipe is connected to a waste gas channel. The inner pipe equipped with the burner head is straight and is thus located within the straight section of the protective pipe.
It is desirable to keep the outer pipe at a temperature of up to 1150-1200°C, so as to thereby enhance the power concentration of the burner. This can be achieved by producing the outer pipe from a high temperature material, such as silicon carbide (SiC) or APM. APM is an acronym of Advanced Powder Metallurgy, and the material concerned contains about 73% Fe, 22% Cr and 5% Al. The powder material is extruded into a tubular form. One problem is that when the flame leaves the burner head and comes into contact with the inner pipe, there is formed a region in which the temperature of the inner pipe tends to become too high on relation to the temperature at which the inner pipe is intended to operate.
The present invention solves this problem.
The present invention thus relates to a furnace-heating gas burner of the kind in which the burner head 1 is situated at one end of an inner pipe which is surrounded by an outer protective pipe and wherein a first part of the inner pipe that surrounds the burner head is provided, and wherein a separate inner pipe is provided in the extension of the first pipe which separate inner pipe lies axially in line with the first pipe and commences at the open end thereof, and wherein the burner is characterised in that the outlet of the first pipe has an inner diameter which is smaller than the remainder of the pipe at the end of said first pipe that faces towards the separate pipe.
The invention will now be described in more detail partly with reference to an exemplifying embodiment thereof illustrated in the accompanying drawing, in which - Figure 1 illustrates a burner constructed in accordance with the invention.
Figure 1 illustrates a known type of gas burner for heating furnaces. The gas burner is of the kind in which the burner head 1 is situated at one end of an inner pipe 2, which is surrounded by an outer protective pipe 3. The bottom 4 of the protective pipe 3 is closed. Thus, the waste gases from the burner head will pass down inside the inner pipe 2 to the bottom 4 of the outer pipe 3 and then turn to flow back between the outer pipe and the inner pipe, as shown by the arrows, and thereafter flow into an exhaust channel 5 that leads to the surroundings.
Figure 1 shows a first part 2 of the inner pipe that surrounds the burner head, and also shows a separate inner pipe 8 situated in the extension of the inner pipe 2. This separate inner pipe 8 is axially in line with the first pipe and commences at the open end of the first pipe 2. The first pipe 2 and the separate inner pipe 8 are thus axially in line with each other. The separate inner pipe 8 commences at the open end of the first pipe 2. The invention is not restricted to any particular gas burner or to any other type of burner, but may equally as well have been described with reference to the above-mentioned type of burner, which also has an inner pipe that is surrounded by an outer protective pipe, but where the bottom of the protective pipe is not closed but where the protective pipe is curved and the free end of said pipe is connected to a waste gas channel.
Gaseous fuel is fed into an inlet 6 and air of combustion is fed into an inlet 7.
According to the invention, the outlet of the first pipe has a smaller inner diameter than the remainder of the tube at that end which faces towards the separate pipe.
In the Figure 1 embodiment, the first pipe 2 narrows at its lower end. The tapering part 9 causes the speed of the gas to increase towards the mouth 10. In turn, this means that the flame 11 issuing from the mouth will be longer than it would otherwise be when using a typical fully cylindrical first pipe. In turn, the longer flame means that the area of the inner surface of the separate pipe that is heated directly by the flame, i.e. the surface area contacted by the flame, will be much greater than in the case of conventional burners.
It has surprisingly been found that this enlargement of the flame eliminates the aforementioned problem, despite the fact that the flame develops as much heat as in the case of a conventional burner and despite the fact that the inner pipe 8 is heated from both sides.
According to a preferred embodiment of the invention, the smaller inner diameter of the mouth 10 is 10% to 50% of the inner diameter of the remainder of the pipe.
According to another preferred embodiment, the mouth 10 of the first pipe 2 is located essentially at the proximal opening 12 of the separate pipe 8.
Although certain embodiments have been described above, it will be understood that the tapering may have a conical shape or some other shape. It will therefore be understood that the present invention shall not be considered to be restricted to the aforedescribed exemplifying embodiments but that variations can be made within the scope of the accompanying Claims.

Claims

1. A furnace-heating gas burner of the kind in which the burner head (1) is situated at one end of an inner pipe (2) which is surrounded by an outer protective pipe (3), and wherein a first part of the inner tube (2) that surrounds the burner head is provided, and wherein a separate inner pipe (8) is provided in the extension of the first pipe (2), which separate inner pipe (8) lies axially in line with the first pipe and commences at the open end of said first pipe (2), characterised in that at the end of the first pipe (2) which faces towards the separate pipe (8) the outlet of said first pipe has an inner diameter which is smaller than the diameter of the pipe in general.
2. A burner according to Claim 1, characterised in that said smaller inner diameter is 10% to 50% of the inner diameter of the first pipe (2) in general.
3. A burner according to Claim 1 or 2, characterised in that the mouth (10) of the first pipe (2) is situated essentially at the nearby opening (12) of the separate pipe (8).
EP02704026A 2001-03-19 2002-03-13 Radiant tube gas burner Withdrawn EP1370800A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0100948A SE0100948L (en) 2001-03-19 2001-03-19 Burner for gas
SE0100948 2001-03-19
PCT/SE2002/000463 WO2002075209A1 (en) 2001-03-19 2002-03-13 Radiant tube gas burner

Publications (1)

Publication Number Publication Date
EP1370800A1 true EP1370800A1 (en) 2003-12-17

Family

ID=20283422

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02704026A Withdrawn EP1370800A1 (en) 2001-03-19 2002-03-13 Radiant tube gas burner

Country Status (7)

Country Link
US (1) US20040096794A1 (en)
EP (1) EP1370800A1 (en)
JP (1) JP2004526118A (en)
CN (1) CN1498325A (en)
SE (1) SE0100948L (en)
TW (1) TW593927B (en)
WO (1) WO2002075209A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE527766C2 (en) * 2004-10-22 2006-05-30 Sandvik Intellectual Property Procedure for combustion with burners for industrial furnaces, as well as burners
US7802421B2 (en) * 2005-11-14 2010-09-28 Ngk Insulators, Ltd. PM generating apparatus
WO2009096562A1 (en) * 2008-02-01 2009-08-06 Ihi Corporation Combustion heater
IT1397333B1 (en) * 2009-06-26 2013-01-10 Ergo Design S R L BURNER
ITPD20120282A1 (en) * 2012-09-27 2014-03-28 Systema Polska Sp Zo O GAS COMBUSTION HEAD FOR PREMIXED BURNERS
JP6019165B2 (en) * 2015-04-27 2016-11-02 東京瓦斯株式会社 Heat exchanger with combustor for fluid heating

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2857961A (en) * 1954-07-13 1958-10-28 Brown Fintube Co Oil burners
US4375949A (en) * 1978-10-03 1983-03-08 Exxon Research And Engineering Co. Method of at least partially burning a hydrocarbon and/or carbonaceous fuel
DE2920902A1 (en) * 1979-05-23 1981-04-09 Loi Industrieofenanlagen Gmbh, 4300 Essen DEVICE FOR HEATING AN INDUSTRIAL STOVE
GB2128727B (en) * 1982-09-29 1985-08-29 British Gas Corp Heating elements
FR2616518B1 (en) * 1987-06-11 1990-11-30 Gaz De France INTERNAL CERAMIC TUBE IN PARTICULAR FOR A RADIANT TUBE WITH A RECIRCULATION GLOVE
DE19505401C1 (en) * 1995-02-17 1996-04-04 Ws Waermeprozestechnik Gmbh Ceramic jet pipe for industrial furnace
SE518816C2 (en) * 1997-10-20 2002-11-26 Kanthal Ab Procedure for exhaust gas purification and gas burner
JPH11201416A (en) * 1998-01-06 1999-07-30 Chugai Ro Co Ltd Exhaust gas circulation type low nox radiant tube burner
SE518704C2 (en) * 2001-03-19 2002-11-05 Sandvik Ab Burner provided with mixing chamber for fuel and air

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO02075209A1 *

Also Published As

Publication number Publication date
WO2002075209A1 (en) 2002-09-26
CN1498325A (en) 2004-05-19
SE0100948D0 (en) 2001-03-19
US20040096794A1 (en) 2004-05-20
SE0100948L (en) 2002-09-20
TW593927B (en) 2004-06-21
JP2004526118A (en) 2004-08-26

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