EP0884528A2 - Brennerkopf für Gasbrenner - Google Patents

Brennerkopf für Gasbrenner Download PDF

Info

Publication number: EP0884528A2
Authority: EP; European Patent Office
Prior art keywords: conveyor; air; combustion head; flame; head according
Prior art date: 1997-06-11
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.): Granted

Application number

EP98830356A

Other languages

English (en)

French (fr)

Other versions

EP0884528B1 (de

EP0884528A3 (de

Inventor

Claudio Pancolini

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.)

CIB Unigas SpA

Original Assignee

CIB Unigas SpA

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.)

1997-06-11

Filing date

1998-06-09

Publication date

1998-12-16

1997-06-11 Priority claimed from IT97CR000006 external-priority patent/IT1297671B1/it

1998-05-12 Priority claimed from ITCR980007 external-priority patent/IT244956Y1/it

1998-06-09 Application filed by CIB Unigas SpA filed Critical CIB Unigas SpA

1998-12-16 Publication of EP0884528A2 publication Critical patent/EP0884528A2/de

1999-07-28 Publication of EP0884528A3 publication Critical patent/EP0884528A3/de

2003-10-15 Application granted granted Critical

2003-10-15 Publication of EP0884528B1 publication Critical patent/EP0884528B1/de

2018-06-09 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Images

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
- F23D14/46—Details, e.g. noise reduction means
- F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
- F23D14/78—Cooling burner parts
- 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
- 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
- F23D14/84—Flame spreading or otherwise shaping

Definitions

the present invention concerns a combustion head for burners, in particular boilers, stoves, ovens, dryers and similar fed with combustible gas.
the front part of the burners consists of a combustion head that is introduced inside the combustion chamber, and the functions whereof are to optimize the mixture of combustible and burning air so as to obtain the best management of the flame in any point thereof, thus reducing the emission of polluting substances, in particular of nitrogen oxide, usually shown with NO x .
combustion heads mainly comprising an outer tu-bular case; an inner tubular pipe for the gas feeding, fixed at the back of the burner's body, and ending up in the front part with a gas distributor; an air conveyor applied to a collar placed on said gas feeder; and an outer nozzle of tubular shape, which is a prolongation of said outer tu-bular case, ending up in the front part with an end in the shape of a converging truncated cone.
openings are provided for the emission of the combustible gas, or tubular nozzles for the emission of said gas are applied in sunburst.
said nozzles may be slightly frontwards inclined relating to the direction of emission of the burning air.
small holes are provided on the gas distributor, for the emission of the so-called root gas which prevents the detachment of the flame from the combustion head, assures the stability of the flame and favours the ignition of the burner.
the air conveyor usually has the shape of a cylinder, is open on the front side and is provided with holes (or openings) for the passage of the air, which are uniformly distributed onto its annular plane bottom fixed to the collar, also provided with holes, of the gas feeder. Said openings allow the burning air to pass in the area determined for the mixing with the combustible and for the ignition of the flame.
the outer tubular case leads the burning air blown by a fan provided on the burner, by means of its cylindrical body.
the nozzle with its end part converging in the shape of a truncated cone, favours the forming and burning of the air-gas mixture and shapes the flame in the combustion chamber.
a further aim is the one of shaping the flame, so as to reduce the length thereof in use in boilers with combustion chambers with passing flame, or for increasing said length in use in boilers with combustion chambers with flame reversal, when it is requested that the flame has a greater penetration power.
a combustion head for gas burners comprising a tubular outer case for canalizing the burning air, an inner tubular pipe for feeding the combustible provided with nozzles for the emission of the same, characterized in that it comprises a disc air conveyor provided with means for the passage of the burning air, and a shaped flame conveyor.
the edge of the disc air conveyor is placed near the end part of the outer tubular case, for obtaining a better post-mixture of the gas and the burning air, and the outlet opening of the nozzles is provided on the combustion front of the head with respect to said air conveyor, so that the plane passing through the outlet opening of each nozzle meets that plane with the greatest circumference of said air conveyor disc, at a distance from the axis of the combustion head which is not less than the radius of said circumference.
the disc air conveyor has the shape of a diverging truncated cone, and the shaped flame conveyor stretches far beyond the section of the nozzle's mouth, also having a diverging shape.
the disc air conveyor is plane and has the shape of circular crown, and the flame conveyor stretches little beyond the section of the nozzle's mouth, with a mainly cylindric shape.
the flame conveyor is connected with a coaxial piping internal to the gas piping for favouring the cooling down of the same; in said piping, air from the burner's fan flows and it comprises at least one outlet hole for said air.
the advantages obtained by means of the present invention mainly consist in that the emission levels of the NO x compounds are comprised between 15 and 20 p.p.m.; in that extremely low levels of carbon monoxide are maintained, i.e. equal to those obtained by means of the actually known combustion heads; in that an optimal ignition of the flame is obtained even in conditions of strong air excess, and a good stability of said flame; in that the flame may be shaped in such a way as to reduce or increase the length thereof, so as to improve the combustion efficiency in boilers with ocmbustion chambers of small dimensions with passing flame as well as in combustion chambers with flame inversion; and in that the combined action of the disc air conveyor and of the shaped flame conveyor allws to obtain a re-circulating effect of the burned gases without ducting the flame, as it is necessary in the con-ventioal burners, and without increasing the electric po-wer of the fan's engine inserted in the burner.
Figure 1 shows a lateral and partially section view of a combustion head for gas burners, in particular for boilers with combustion chambers with passing flame, according to the present invention.
Figure 2 shows a longitudinal and partially exploded view of said combustion head.
Figures 3 and 4 respectively show a longitudinal section and a front view of an air conveyor of the combustion head of figures 1 and 2.
Figure 5 shows a longitudinal section and partially exploded view of a variant of the combustion head, provided with additional piping for the adduction of air to the flame conveyor.
Figure 6 shows a front view of the flame conveyor of figure 5.
Figure 7 shows a front view of the front part of a combustion head for gas burners, in particular for boilers with combustion chambers with flame inversion.
Figure 8 shows a longitudinal axial view according to line VII-VII of figure 7, of said combustion head.
Figure 9 shows a lateral view of a burner provided with a combustion head, in particular for boilers with combustion chambers with passing flame, according to the present invention.
the combustion head for gas burners mainly comprises an outer tubular case 1, and inner tubular pipe 2, an air conveyor 3, a flame conveyor 4 and gas emission nozzles 5.
the outer tubular case 1 has a mainly cylindrical shape and has the function of canalizing piping for burning air which flows between the iner tubular piping 2 and said case, blown by a fan of known kind provided in the back part 8 of said burner.
Said case 1 begins near a flange 7 for the connection of the burner to the boiler, and ends near the edge of said air conveyor 3.
the inner diameter of said case 1 is greater, in each section, than the one of the inner tubular piping 2 as well as than the edge circumference of said air conveyor 3.
Said inner air pipe 2 mainly consists of a piping for supplying combustible gas, which at the rear end is connected to the mouth 9 for the gas inlet and at the front end to a flame conveyor 4.
said pipe 2 is provided with a collar 10 for fixing said air conveyor 3.
Said collar 10 is also provided with holes 11 for the passage of the burning air.
nozzles 5 for the emission of the combustible are screwed to said pipe 2.
Said nozzles 5 are arranged in sunburst to the axis of said pipe 2.
the outlet mouth of said nozzles 5 is provided on the combustion front of the head with respect to the air conveyor 3 disc, and the plane passing through the outlet mouth of each nozzle meets the plane with the greatest circumference of said air conveyor 3 at a distance from the axis of the combustion head not inferior to the radius of said circumference.
a small hole 12 is performed on said pipe 2 in correspondence with each nozzle 5, for the emission of root gas.
the air conveyor 3 is realized by means of a disc provided with means for the passage of the burning air, advantageously consisting of holes 6 or openings of appropriate shape, regularly distributed on the surface of said conveyor and regularly spaced out with said nozzles 5.
the flame conveyor 4 comprises a shaped element, intemally hollow, that stretches coaxially to said pipe 2 beyond the end section of said nozzles 5.
the end of said flame conveyor 4 consists of a plane surface of circular shape.
the combustion head is finished with an ignition and a survey electrode of the known kind, not shown in the figures.
the air conveyor 3 disc is advantageously folded in the shape of a truncated cone, diverging in the advancing sense of the burning air flow, and the nozzles 5 are consequently forward inclined of about 30° with respect to the plane normal to the axis of the combustion head, for mainly following the inclination of said disc 3.
the shape of the flame conveyor 4 is advantageously realized by means of two diverging surfaces 13 and 14 in the shape of a truncated cone, connected by a cylindric portion 15.
angles obtained by the conical surfaces 13 and 14 with the combustion head's axis are respectively about 45° and 25°.
the same is provided with a further pipe 16 internal to the gas pipe, in which air blown by said fan of the burner is flown, for preventing the flame conveyor 4 from overheating due to the nearness to said flame.
Said pipe 16 ends up in the hollow body of the flame conveyor 4, which in this case is provided with pipes 17 and emission holes 18.
cooling air supplied through pipe 16 comes out from pipe 17 through holes 18, so as to prevent the overheating of the flame conveyor 4 and to supply further oxygen for the combustion.
the air conveyor disc 3 is advantageously plane, in the shape of a circular crown and arranged perpendicularly to the combustion head's axis in correspondence with the end portion of the outer tubular case 1, which is shaped with a converging lip 19.
nozzles 5 are normal to the combustion head's axis.
Said flame conveyor 4 has a mainly cylindrical shape, with an outer diameter equal to the one of said pipe 2, and stretches little beyond the end front section of said pipe 2. Such stumpy shape of the flame conveyor allows the flame to extend more in length.
the combustion head is advantageously provided with a further pipe 16, coaxial and internal to the gas pipe, in which air blown from the burner's fan flows, for preventing the flame conveyor 4 from excessively overheating and for assuring a furthe oxygen supply for the combustion.
Pipe 16 ends up in the flame conveyor 4 which is provided with at least one hole 18 for the emission of said air.
the combustible gas is led to nozzles 5 and to holes 12 through pipe 2, while the burning air, blown by the fan in the back portion 8 of the burner, passes through the annular duct with decreasing section that is obtained between the case 1, the pipe 2 and the air conveyor 3, as well as through holes 11 and 6 respectively on said collar 10 and on said air conveyor 3.
the combustible gas is fed to nozzles 5 and to holes 12 through the inner tubular pipe 2.
the burning air blown by said fan of mainly known kind in the burner passes through the annular duct that is obtained between the outer case 1 and the inner pipe 2, as well as through pipe 16.
the main flow of burning air comes out from the circular crown with variable section, obtained between the shaped end portion with the converging lip 19 of said outer case 1 and the edge of said air conveyor 3, as well as from the openings 6 on said air conveyor.
the secondary air flow fed by pipe 16 comes our directly from hole 18 present on the flame conveyor 4.

Landscapes

Engineering & Computer Science (AREA)
Chemical & Material Sciences (AREA)
Combustion & Propulsion (AREA)
Mechanical Engineering (AREA)
General Engineering & Computer Science (AREA)
Gas Burners (AREA)
Pre-Mixing And Non-Premixing Gas Burner (AREA)

EP98830356A 1997-06-11 1998-06-09 Brennerkopf für Gasbrenner Expired - Lifetime EP0884528B1 (de)

Applications Claiming Priority (4)

Application Number	Priority Date	Filing Date	Title
IT97CR000006 IT1297671B1 (it)	1997-06-11	1997-06-11	Testa di combustione per bruciatori di gas
ITCR970006		1997-06-11
ITCR980007 IT244956Y1 (it)	1998-05-12	1998-05-12	Testa di combustione per bruciatori di gas
ITCR980007U		1998-05-12

Publications (3)

Publication Number	Publication Date
EP0884528A2 true EP0884528A2 (de)	1998-12-16
EP0884528A3 EP0884528A3 (de)	1999-07-28
EP0884528B1 EP0884528B1 (de)	2003-10-15

Family

ID=26330482

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP98830356A Expired - Lifetime EP0884528B1 (de)	1997-06-11	1998-06-09	Brennerkopf für Gasbrenner

Country Status (3)

Country	Link
EP (1)	EP0884528B1 (de)
AT (1)	ATE252216T1 (de)
DE (1)	DE69818909T2 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US6443728B1 (en) *	2001-03-19	2002-09-03	Alstom (Schweiz) Ag	Gas pipe ignitor
WO2013134640A1 (en) *	2012-03-09	2013-09-12	The Gsi Group, Llc	Burner for gas-fired air heater
ITMI20131223A1 (it) *	2013-07-22	2015-01-23	Ceba S R L	Bruciatore radiale
WO2019002908A1 (en) *	2017-06-26	2019-01-03	C.I.B. Unigas S.P.A.	NOX LOW NOx COMBUSTION HEAD FOR BURNER AND BURNER COMPRISING SUCH A HEAD
CN113167468A (zh) *	2018-09-27	2021-07-23	C．I．B．优尼瓦斯股份公司	用于废气再循环燃烧器的混合器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE102017116529B4 (de) *	2017-07-21	2022-05-05	Kueppers Solutions Gmbh	Brenner

Citations (7)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US2684711A (en) *	1952-04-23	1954-07-27	Fault Homer D Du	Gas burner secondary air feed and flame baffle
DE2428622A1 (de) *	1973-06-15	1975-01-09	O F R Officine Fratelli Riello	Brennerkopf, insbesondere fuer gasfoermige brennstoffe
GB1537037A (en) *	1976-03-17	1978-12-29	Nu Way Heating Plants Ltd	Burners for fluid fuels
EP0284004A1 (de) *	1987-03-26	1988-09-28	Kabushiki Kaisha Kuwabara Seisakusho	Wandstrahlungsbrenner-Apparat
GB2274510A (en) *	1993-01-23	1994-07-27	Riedhammer Gmbh Co Kg	Gas burner for furnaces or kilns
EP0660039A1 (de) *	1993-12-24	1995-06-28	Gaz De France (Service National)	Brennerkopf für Gasbrenner, Brenner versehen mit einem solchen Kopf und Verbrennungsverfahren
EP0738854A2 (de) *	1995-04-19	1996-10-23	Tokyo Gas Co., Ltd.	Verbrennungsverfahren und Vorrichtung mit niedrigen Stickstoffoxidemissionen

1998
- 1998-06-09 DE DE69818909T patent/DE69818909T2/de not_active Expired - Fee Related
- 1998-06-09 EP EP98830356A patent/EP0884528B1/de not_active Expired - Lifetime
- 1998-06-09 AT AT98830356T patent/ATE252216T1/de not_active IP Right Cessation

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US2684711A (en) *	1952-04-23	1954-07-27	Fault Homer D Du	Gas burner secondary air feed and flame baffle
DE2428622A1 (de) *	1973-06-15	1975-01-09	O F R Officine Fratelli Riello	Brennerkopf, insbesondere fuer gasfoermige brennstoffe
GB1537037A (en) *	1976-03-17	1978-12-29	Nu Way Heating Plants Ltd	Burners for fluid fuels
EP0284004A1 (de) *	1987-03-26	1988-09-28	Kabushiki Kaisha Kuwabara Seisakusho	Wandstrahlungsbrenner-Apparat
GB2274510A (en) *	1993-01-23	1994-07-27	Riedhammer Gmbh Co Kg	Gas burner for furnaces or kilns
EP0660039A1 (de) *	1993-12-24	1995-06-28	Gaz De France (Service National)	Brennerkopf für Gasbrenner, Brenner versehen mit einem solchen Kopf und Verbrennungsverfahren
EP0738854A2 (de) *	1995-04-19	1996-10-23	Tokyo Gas Co., Ltd.	Verbrennungsverfahren und Vorrichtung mit niedrigen Stickstoffoxidemissionen

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US6443728B1 (en) *	2001-03-19	2002-09-03	Alstom (Schweiz) Ag	Gas pipe ignitor
WO2013134640A1 (en) *	2012-03-09	2013-09-12	The Gsi Group, Llc	Burner for gas-fired air heater
US9194604B2 (en)	2012-03-09	2015-11-24	The Gsi Group, Llc	Burner for gas-fired air heater
ITMI20131223A1 (it) *	2013-07-22	2015-01-23	Ceba S R L	Bruciatore radiale
WO2019002908A1 (en) *	2017-06-26	2019-01-03	C.I.B. Unigas S.P.A.	NOX LOW NOx COMBUSTION HEAD FOR BURNER AND BURNER COMPRISING SUCH A HEAD
CN111033122A (zh) *	2017-06-26	2020-04-17	C．I．B．优尼瓦斯股份公司	具有低NOx排放的用于燃烧器的燃烧头部及包括该头部的燃烧器
EA037363B1 (ru) *	2017-06-26	2021-03-18	С.И.Б. Унигас С.П.А.	ГОЛОВКА ГОРЕНИЯ С НИЗКИМИ ВЫБРОСАМИ NOx ДЛЯ ГОРЕЛОК И ГОРЕЛКА, СОДЕРЖАЩАЯ ТАКУЮ ГОЛОВКУ
US11415317B2 (en) *	2017-06-26	2022-08-16	C.I.B. Unigas S.P.A.	Combustion head with low emission of NOx for burners and burner comprising such a head
CN113167468A (zh) *	2018-09-27	2021-07-23	C．I．B．优尼瓦斯股份公司	用于废气再循环燃烧器的混合器
CN113167468B (zh) *	2018-09-27	2023-10-24	C．I．B．优尼瓦斯股份公司	用于废气再循环燃烧器的混合器

Also Published As

Publication number	Publication date
EP0884528B1 (de)	2003-10-15
DE69818909D1 (de)	2003-11-20
ATE252216T1 (de)	2003-11-15
EP0884528A3 (de)	1999-07-28
DE69818909T2 (de)	2004-08-19

Publication	Publication Date	Title
US5241949A (en)	1993-09-07	Recuperative radiant tube heating system especially adapted for use with butane
US4488869A (en)	1984-12-18	High efficiency, low NOX emitting, staged combustion burner
US4705022A (en)	1987-11-10	Recuperative radiant tube heating system
US4673350A (en)	1987-06-16	Burner assembly for radiant tube heating system
EP0935097A3 (de)	2000-01-19	Brennkammer
US6036481A (en)	2000-03-14	Burner with flame retainer insert
WO2003081132A3 (en)	2004-02-12	Improved burner with low nox emissions
CN104613473B (zh)	2017-11-10	一种多孔燃气射流烧嘴
US4428309A (en)	1984-01-31	Pulverized-coal and liquid-fuel dual-purpose burner
CA2372346A1 (en)	2001-09-20	Low nox radiant wall burner
JP2004508527A5 (de)	2005-01-06
US6652268B1 (en)	2003-11-25	Burner assembly
CA3009668C (en)	2024-01-30	Low nox burner apparatus and method
US9945555B2 (en)	2018-04-17	Multi-air chamber burner with swirl generator
EP0884528A2 (de)	1998-12-16	Brennerkopf für Gasbrenner
US7052273B2 (en)	2006-05-30	Premixed fuel burner assembly
US4979894A (en)	1990-12-25	Arrangement for burning fuels in a narrow combustion space
CN112189113A (zh)	2021-01-05	燃料喷嘴系统
CN211399774U (zh)	2020-09-01	燃烧器以及锅炉-燃烧器组件
EP3712497A1 (de)	2020-09-23	Brenner sowie kessel-brenneranordnung
KR200249581Y1 (ko)	2001-11-16	토치용 화구
FI127741B (fi)	2019-01-31	Bioöljypoltin
KR100187029B1 (ko)	1999-03-20	2중 벤츄리 버너
JPS6042247Y2 (ja)	1985-12-25	Ｌｐｇ水素混焼バ−ナにおけるノズル構造
JP3331384B2 (ja)	2002-10-07	ガスバーナー

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