US3529812A - Burner with air-preheated recovery - Google Patents

Burner with air-preheated recovery Download PDF

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Publication number
US3529812A
US3529812A US784963*A US3529812DA US3529812A US 3529812 A US3529812 A US 3529812A US 3529812D A US3529812D A US 3529812DA US 3529812 A US3529812 A US 3529812A
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United States
Prior art keywords
burner
air
canals
flue gas
nozzle
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.)
Expired - Lifetime
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US784963*A
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English (en)
Inventor
Joachim Wunning
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.)
Firma J Aichelin
Original Assignee
Firma J Aichelin
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Filing date
Publication date
Priority claimed from DE19671551761 external-priority patent/DE1551761A1/de
Application filed by Firma J Aichelin filed Critical Firma J Aichelin
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Publication of US3529812A publication Critical patent/US3529812A/en
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Expired - Lifetime legal-status Critical Current

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    • 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

Definitions

  • Means such as an accordion-type folded body, is mounted in the annular gap to provide a plurality of radially extending partitions which form a plurality of axial canals in said annular gap. Air flowing in alternate canals is preheated by heat transferred thereto from the hot flue gases flowing in the remaining alternate canals.
  • the invention relates to industrial-type burners, preferably for gaseous fuels, and more particularly to burners having heat exchange surfaces for preheating of air.
  • a rib recuperator In prior art industrial burners using jet heating tubes and more particularly burners having jacket jet heating tubes, incoming air flowing in a direction opposite to the waste gases, is preheated on its way to the mouth of the burner nozzle.
  • a rib recuperator is generally provided which consists mainly of radially positioned heat exchange sheets which extend in an axial direction in the air supply canal over which flows the air to be heated. These sheets have additional portions which project into a waste gas discharge canal in which the hot waste gases flowing over the additional portions of the sheets transfer heat to said sheets.
  • a heat transfer efficiency rate of about 70% can be achieved with such known rib recuperators at furnace temperature of around 900 C.
  • the main object of this invention is to provide a burner which is more efficient than the abovedescribed known burners, which does not require increased space, which is economical to manufacture and operate, and which emits exhaust gases having reduced temperatures.
  • a burner comprises a central fuel nozzle and an air duct cylinder surrounding the nozzle.
  • a jacket tube surrounds and is spaced from the air duct cylinder to form an annular gap therebetween.
  • an air inlet and a flue gas outlet are also provided.
  • the above described type of burner according to this invention provides relatively large heat exchange surfaces between the gas discharge and air supply canals. Also, due to the multiple subdivision of the air canals, a very favor- 3,529,812 Patented Sept. 22, 1970 able flame formation develops in the burner. Moreover, the heat exchange canals are relatively small so that a good heat exchange is ensured while still providing a relatively large free space within the air duct cylinder which can be used for ignition devices, air cooling ducts with oil nozzles, or the like.
  • FIG. 1 is a sectional view of a jacket jet heating tube having a burner according to the invention
  • FIG. 2 is a sectional view of the jet heating tube of FIG. 1 taken along line IIII;
  • FIG. 3 is a sectional view of another industrial burner according to the invention.
  • a jacket jet heating tube is mounted into a furnace wall 1.
  • the heating tube comprises a jacket tube 2 of heat resistant material which is fastened on one end to furnace sheet 4 via members 3.
  • Tube 2 is terminated at its other end by an end portion 5 made of the same material as 2.
  • end portion 5 made of the same material as 2.
  • Nozzle 6 is mounted in a lid 7 and fuel, such as oil or gas for example, is fed thereto via duct 8.
  • An inspection hole 9 is provided and an ignition electrode 10 is mounted to lid 7.
  • Fuel nozzle 6 is surrounded by a concentric air duct cylinder 11 which cooperates with jacket tube 2 to form an annular gap 12 therebetween.
  • Cylinder 11 is necked down at its upper end and is fastened to a cylindrical member 14 of lid 7 by means of screw 15.
  • This mounting arrangement allows adjustment of the position of cylinder 11.
  • axially extending canals 17 and 18 are formed by means of axially extending partition walls 16.
  • Alternate canals 17 and 18 are designated as air canals 17 and as flue gas canals 18.
  • Flue gas canals 18 are connected to a waste gas collecting duct 19 which ends in a waste gas discharge connection 20 connected to a suction draft device 35.
  • the air supply canals 17 are connected with an annular space 21 through which air enters from an air supply duct 22.
  • the subdivision of the annular gap 12 into axial canals 17, 18 is accomplished by inserting a molded sheet body 23 into the annular gap 12.
  • the molded body 23 as can be seen from FIG. 2 (left side), is folded in accordionlike manner. The folds on one side of body 23 cooperate with jacket tube 2 to define the axial flue gas canals 18, and the folds on the other side of body 23 cooperate with cylinder 11 to define the air supply canals 17.
  • the molded sheet body 23 consists of a heat resistant material.
  • the molded sheet body 23 can also be formed from a number of sheet strips of different materials, because a higher temperature is present substantially in the area of the mouth of burner nozzle 6.
  • Air supply duct canals 17 are terminated at their lower ends by walls 24 at the front side facing the mouth of burner nozzle 6.
  • the walls 24 are arranged in an oblique manner inclined toward the axis of the burner tube 6 to permit all air in canals 17 to escape towards the burner.
  • the partition walls 16, as can be seen from FIG. 1 can also be cut in a corresponding oblique manner.
  • Air duct cylinder 11, in the area of the burner nozzle month, has a conical ring-shaped front wall 25, which, as indicated by air flow arrows in FIG. 1, conducts the air escaping from air canals 17 substantially laterally into the flame of burner 6.
  • interior tube 26 which is secured to the molded sheet body 23 in the vicinity of the extended lower part of air duct cylinder 11.
  • the molded sheet body 23 shown in FIG. 2 on the left side has partition walls 16 which are substantially radial, the edges of the folds of sheet 23 extending parallel to the burner axis.
  • a molded sheet body 23a (indicated on the right side in FIG. 2) is shaped in such a manner that the folds thereof run tangentially with respect to the burner axis so that the escaping air, at the mouth of the burner nozzle 6 is provided with a twist. This results in a twist flame being produced.
  • the folds of sheet 23a can run in spiral-like manner; the characteristics of the twist can be adjusted to the specific requirements to provide the desired air flow.
  • FIG. 3 a burner similar to that of FIGS. 1 and 2 is shown wherein the same elements are given the same reference numerals.
  • interior tube 26 is inserted into a perforated burner stone 27 and jacket tube 2' is open at its lower end 28 which is located toward the interior space of the furnace.
  • the flue gases coming from burner stone 27 enter the interior furnace space. From there they can enter through an annular space 29, located between burner stone 27 and the front wall of jacket tube 2 (at 28) into flue gas canals 18, which canals are not shown in detail since the arrangement of FIG. 3 is the same as the arrangement of FIGS. 1 and 2.
  • the molded body 23 of FIGS. 1 and 2 may be made by means of any well known method.
  • One such method consists of shaping a sheet metal strip of suitable heat resistant material between two rollers into a corrugated sheettype form.
  • the corrugated metal strip is then gathered together to form the accordionlike folds shown in FIG. 2.
  • the corrugated strip is then provided with front Walls 24 on alternate channels thereof which are welded on and directed such that the supply air is blown into the flame of the burner 6 in substantially a lateral direction.
  • the sheet-molded body 23 is then bent around and inserted into the annular gap 12, as shown in FIGS. 1 and 2.
  • the air duct cylinder 11 is arranged in such a manner that it can be axially shifted. This is accomplished by means of loosening the set screw 13 and axially adjusting the position of cylinder 11. The set screw 13 is re-tightened when the desired position is reached. This effectively varies the dimensions of the opening between slanted walls 24 and 25, which in turn varies the exit speed of the supply air.
  • bodies which increase the turbulence of the air or flue gas flowing in the canals may be provided.
  • wire nets or screens may be provided in the canals.
  • a burner was built according to the invention and was examined and tested in detail to confirm the abovementioned clear advantages over conventional types of burners.
  • the fold recuperator which, according to the invention, is accommodated in the relatively small annular gap 12 is small enough so that there is suflicient space for the accommodation of auxiliary devices, such as ignition devices and the like, While using a burner having the same length and the same outer diameter as the known prior art burners.
  • the kF value is a well known characteristic which is used for expressing the efliciency of such a recuperator.
  • the actual burner which was built featured a jacket tube 2 having an outer diameter of 150 mm.
  • the length of the recuperator, that is of the folded'molded-sheet part 23 was about 400 mm., which corresponds to a nonmal industrial furnace so that the recupreator does not project to the outside.
  • a flue gas temperature of 350 C. was obtained at the burner outlet. This corresponds to a furnace efficiency rate of more than 85%.
  • a very favorable flame formation was achieved, which is due, at least in part, to the multiple subdivision of the current of supply air.
  • the supply air was preheated to about 750 C. at the mouth of the burner nozzle 6up to a point above the ignition temperature of the fuel. This further enhanced the performance of the burner under test.
  • a burner comprising:
  • recuperative air preheating means including: an air duct cylinder (11) mounted within the space between said nozzle (6) and said jacket tube (2);
  • annular gap (12) being formed between said cylinder (11) and said jacket tube (2);
  • said terminating means (24) includes front walls (24) positioned such that all of said walls (24) form a conical segment, said Walls being inclined toward the center axis of the burner.
  • said air duct cylinder (11) includes means (13) for enabling the position of said air duct cylinder (11) to be shifted in an axial direction.
  • a burner according to claim 1 wherein said flue gas canals (18) are connected to a suction draft device on one side.
  • a burner according to claim 5 wherein said partition walls (16) and the folds of the molded sheet part (23) respectively, are chamfered at the ends thereof which face the mouth of said fuel nozzle (6 13.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)
US784963*A 1967-08-17 1968-08-15 Burner with air-preheated recovery Expired - Lifetime US3529812A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19671551761 DE1551761A1 (de) 1967-08-17 1967-08-17 Industriebrenner mit rekuperativer Luftvorwaermung

Publications (1)

Publication Number Publication Date
US3529812A true US3529812A (en) 1970-09-22

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ID=5676834

Family Applications (1)

Application Number Title Priority Date Filing Date
US784963*A Expired - Lifetime US3529812A (en) 1967-08-17 1968-08-15 Burner with air-preheated recovery

Country Status (5)

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US (1) US3529812A (cs)
AT (1) AT287163B (cs)
CS (1) CS172303B2 (cs)
FR (1) FR1576983A (cs)
GB (1) GB1193046A (cs)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3797558A (en) * 1971-02-01 1974-03-19 Kleinewefers Ind Co Gmbh Metallic recuperator and method of operating same
US3811497A (en) * 1971-04-29 1974-05-21 Philips Corp Heat exchanger
US4480986A (en) * 1983-09-14 1984-11-06 Sea-Labs, Inc. Liquid fuel vaporizing burner
US4516935A (en) * 1982-07-23 1985-05-14 Gerhard Sanders Arrangement for heating and/or heat retaining of containers
US4545329A (en) * 1983-09-23 1985-10-08 Pvi Industries, Inc. Water heater
US4854863A (en) * 1987-12-02 1989-08-08 Gas Research Institute Convective heat transfer within an industrial heat treating furnace
US5059117A (en) * 1988-02-11 1991-10-22 Stordy Combustion Engineering Limited Radiant tube furnace and method of burning a fuel
US20040091830A1 (en) * 2002-04-19 2004-05-13 Ws Warmeprozesstechnik Gmbh Flameless oxidation burner
US20040209129A1 (en) * 2001-10-01 2004-10-21 Elisabetta Carrea Combustion process, in particular for a process for generating electrical current and/or heat
US20050014102A1 (en) * 2003-06-12 2005-01-20 Wolfgang Harbeck Recuperator burner including recuperator
US20110244409A1 (en) * 2008-12-10 2011-10-06 Soichiro Kato Comubstor
US20130260326A1 (en) * 2010-09-28 2013-10-03 Paulo Jorge Ferreira Goncalves Oil premix burner
JP2014163581A (ja) * 2013-02-25 2014-09-08 Spinworks Llc 直火型熱交換器一体バーナー
CN109458268A (zh) * 2018-12-29 2019-03-12 杭州温斯特新能源科技有限公司 一种基于斯特林热机吸热器的燃气加热系统

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2912519C2 (de) * 1979-03-29 1984-03-15 Kernforschungsanlage Jülich GmbH, 5170 Jülich Brenner für flüssigen Brennstoff und Verbrennungsluft
DE2948048C2 (de) * 1979-11-29 1981-10-08 Aichelin GmbH, 7015 Korntal Industriebrenner
GB2082753B (en) * 1980-08-29 1984-08-30 British Gas Corp Recuperative burner
GB2128727B (en) * 1982-09-29 1985-08-29 British Gas Corp Heating elements
DE3243399C2 (de) * 1982-11-24 1985-07-25 Danfoss A/S, Nordborg Verbrennungsvorrichtung für eine hohlzylindrischen Wärmetauscher

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2202498A (en) * 1938-10-27 1940-05-28 Land O Lakes Creameries Inc Machine and method for cooling powdered products
US2985438A (en) * 1958-09-26 1961-05-23 Todd Shipyards Corp Outflow control device for high heat release combustion apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2202498A (en) * 1938-10-27 1940-05-28 Land O Lakes Creameries Inc Machine and method for cooling powdered products
US2985438A (en) * 1958-09-26 1961-05-23 Todd Shipyards Corp Outflow control device for high heat release combustion apparatus

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3797558A (en) * 1971-02-01 1974-03-19 Kleinewefers Ind Co Gmbh Metallic recuperator and method of operating same
US3811497A (en) * 1971-04-29 1974-05-21 Philips Corp Heat exchanger
US4516935A (en) * 1982-07-23 1985-05-14 Gerhard Sanders Arrangement for heating and/or heat retaining of containers
US4480986A (en) * 1983-09-14 1984-11-06 Sea-Labs, Inc. Liquid fuel vaporizing burner
US4545329A (en) * 1983-09-23 1985-10-08 Pvi Industries, Inc. Water heater
US4854863A (en) * 1987-12-02 1989-08-08 Gas Research Institute Convective heat transfer within an industrial heat treating furnace
US5059117A (en) * 1988-02-11 1991-10-22 Stordy Combustion Engineering Limited Radiant tube furnace and method of burning a fuel
US20040209129A1 (en) * 2001-10-01 2004-10-21 Elisabetta Carrea Combustion process, in particular for a process for generating electrical current and/or heat
US20040091830A1 (en) * 2002-04-19 2004-05-13 Ws Warmeprozesstechnik Gmbh Flameless oxidation burner
US7029271B2 (en) * 2002-04-19 2006-04-18 Ws Warmeprozesstechnik Gmbh Flameless oxidation burner
US20050014102A1 (en) * 2003-06-12 2005-01-20 Wolfgang Harbeck Recuperator burner including recuperator
US20110244409A1 (en) * 2008-12-10 2011-10-06 Soichiro Kato Comubstor
US20130260326A1 (en) * 2010-09-28 2013-10-03 Paulo Jorge Ferreira Goncalves Oil premix burner
JP2014163581A (ja) * 2013-02-25 2014-09-08 Spinworks Llc 直火型熱交換器一体バーナー
CN109458268A (zh) * 2018-12-29 2019-03-12 杭州温斯特新能源科技有限公司 一种基于斯特林热机吸热器的燃气加热系统
CN109458268B (zh) * 2018-12-29 2023-12-05 杭州英洛威能源技术有限公司 一种基于斯特林热机吸热器的燃气加热系统

Also Published As

Publication number Publication date
AT287163B (de) 1971-01-11
GB1193046A (en) 1970-05-28
FR1576983A (cs) 1969-08-01
CS172303B2 (cs) 1976-12-29

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