EP0698766A2 - Brûleur à gaz - Google Patents
Brûleur à gaz Download PDFInfo
- Publication number
- EP0698766A2 EP0698766A2 EP95305876A EP95305876A EP0698766A2 EP 0698766 A2 EP0698766 A2 EP 0698766A2 EP 95305876 A EP95305876 A EP 95305876A EP 95305876 A EP95305876 A EP 95305876A EP 0698766 A2 EP0698766 A2 EP 0698766A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- wall
- ports
- gas
- gas burner
- burner according
- 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.)
- Granted
Links
- 239000007789 gas Substances 0.000 claims description 53
- 239000000203 mixture Substances 0.000 claims description 18
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 12
- 239000003345 natural gas Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 230000003292 diminished effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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
- F23D14/48—Nozzles
- F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
-
- 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
- F23D14/30—Inverted burners, e.g. for illumination
-
- 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
- F23D14/34—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air
- F23D14/36—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air in which the compressor and burner form a single unit
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2203/00—Gaseous fuel burners
- F23D2203/10—Flame diffusing means
- F23D2203/101—Flame diffusing means characterised by surface shape
- F23D2203/1012—Flame diffusing means characterised by surface shape tubular
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2203/00—Gaseous fuel burners
- F23D2203/10—Flame diffusing means
- F23D2203/102—Flame diffusing means using perforated plates
- F23D2203/1023—Flame diffusing means using perforated plates with specific free passage areas
-
- 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
- F23D2900/00003—Fuel or fuel-air mixtures flow distribution devices upstream of the outlet
Definitions
- the invention relates to gas burners, and is concerned especially, but not necessarily exclusively, with a gas burner suitable for domestic boilers.
- the present invention addresses the disadvantage explained above and as a solution it provides a gas burner having a body into the interior of which a gas and air mixture is fed to pass out through ports in an outer perforated wall of the body for development of a flame on the exterior of the body characterised in that an inner perforated wall is positioned adjacent the outer wall and defines therewith a sub-chamber, the inner wall has ports through which the gas and air mixture flows into the sub-chamber, and the flow resistance through the inner wall is greater than that through the outer wall.
- the volume of the sub-chamber should be small in relation to the volume of the interior of the body.
- a separation of not greater than 1.2 mm between the inner wall member and the outer perforated wall is appropriate. Due to the high flow resistance of the inner wall member, pressure pulses are not transmitted through into the main volume of the burner sufficiently to cause troublesome noise generation.
- Another drawback of the prior art gas burners discussed above is that the pressure generated within the burner by the fan is limited by including in the flow path a restriction needed for producing a pressure differential signal indicative of the air flow rate, which signal is used to control a gas valve in order to maintain an appropriate ratio of gas to air in the mixture fed to the burner.
- a pressure differential signal of at least 1 mb is needed for effective control, and in order to provide this signal a restricted orifice has been provided in the fan inlet, which limits the outlet pressure the fan can produce so that a larger fan than might otherwise be used may be needed.
- means are provided for sensing the pressure differential across the inner wall member of the burner.
- This pressure differential signal is representative of the air flow through the burner and can be used for controlling the gas valve to ensure the correct ratio of gas to air in the mixture fed to the burner. By avoiding a restriction in the fan inlet, the pressure which the fan is able to deliver to the interior of the burner is increased.
- a preferred solution to this problem is to so arrange the gas ports that the velocity of the gas/air mixture through the ports of the outer skin varies over the area of the outer skin, i.e. the outer skin has a variable port loading.
- the ratio of the maximum outer wall port loading to the minimum outer wall port loading is in the range of 1.5:1 to 3:1, e.g. about 2:1.
- the port areas are chosen so that the pressure drop across the inner wall is at least four times greater than that across the outer wall of the burner, and preferably the pressure drop is about ten times greater.
- regions of maximum port loading are spaced apart at a distance of up to 25 mm, such as around 15 mm.
- Illustrated in Figure 1 is a gas burner with a cylindrical body 1 mounted with its axis upright and connected to a fan 2 for delivering a premix of natural gas (mostly methane) and air into the interior of the burner through the lower end thereof.
- the upper end of the burner body is closed by an end wall 3, and the body has a double side wall structure formed by an outer perforated wall or screen 4 and an inner perforated wall or screen 5 lining the outer wall and spaced therefrom at a radial distance in the range of 0.5 to 1.2 mm, and preferably about 0.8 to 1.0 mm.
- the density of the ports in the outer screen is greater than that of the ports in the inner screen so that as the gas and air mixture passes out through the double wall structure most of the pressure drop occurs across the inner wall 5.
- the ports 8 in the outer screen are positioned in groups, in each group there being a central port 8a surrounded by a plurality of equispaced further ports 8b, there being six such further ports as illustrated.
- Each of the ports 8 may be approximately 0.8 mm in diameter with the outer ports 8b having their centres 1.6 mm from the centre of the central port 8a.
- the groups may be arranged with their central ports 8a at the corners of a square grid pattern having a pitch of 5 mm.
- the outer screen may be perforated stainless steel.
- the ports 10 of the inner screen are fewer in number and may be positioned to register with the central ports 8a of the groups of ports in the outer screen, as clearly shown in Figures 4 and 5.
- the flame generated by the central port 8a of each group of ports in the outer screen 4 is surrounded and stabilised by six flames generated by the outer ports 8b of the same group, which outer flames are developed closer to the surface of the screen because their ports carry a lower loading of gas and air mixture. In this way there is established a stable burner flame spaced a small distance from the exterior surface of the burner body.
- each port 10 is surrounded by a ring of eight ports (e.g. port 10' is surrounded by ports 8') four of which are equally spaced from the port 10 at a distance somewhat less than that at which the other four are spaced from the port 10.
- the latter ports are positioned to receive gas entering the cavity between the walls through two inner wall ports.
- Figure 7 illustrates a preferred port arrangement in which, like in the previous embodiments, the ports 10 of the inner wall or skin are arranged in rows, and the outer skin ports 8 are located in groups which are arranged in rows and uniformly distributed.
- the inner and outer skins are spaced at a radial distance in the range 0.5 to 1.2 mm, and preferably about 0.8 to 1 mm.
- Each row of inner skin ports (A,B%) is aligned with a row of outer skin ports (A2,B2%) and each port 10 registers with the central port 8a of a respective group of outer skin ports, although this is not crucial to the working of the invention.
- each port 10 it is preferred nonetheless for the centre of each port 10 to lie within a circle joining the centres of the ports 8b of the group of outer skin ports. Between adjacent rows of the outer skin port groups which confront the inner skin ports 10 are two other rows of skin port groups (A1,A3,B1,B3). As a result of this disposition of the ports, the velocity of gas/air mixture through the outer skin ports, i.e. the port loading, varies across the area of the outer skin with the ratio of the maximum to the minimum port loading being approximately 2:1. It will be appreciated that due to the variation in port loading, the flame height will differ over the area of the burner and as a consequence the tendency to generate noise in the combustion chamber will not be concentrated at any one frequency.
- each of the inner skin ports 10 is approximately 2.2 mm in diameter, and the rows of inner skin ports A,B are spaced approximately 15 mm apart.
- the outer skin ports 8a,8b are approximately 0.8 mm in diameter with ports 8b in each group having their centres on a circle of diameter of around 3.2 mm and concentric with the central port 8a of that group.
- the groups of outer skin ports have their centres located at the corners of a square grid pattern with a length of side of about 5.0 mm.
- the pressure drop produced across the inner skin is approximately 10 times that across the outer skin.
- any pressure fluctuations in the combustion chamber will not be transmitted to the interior of the burner and will instead be confined to the relatively small volume of the sub-chamber 7 defined between the inner and outer perforated walls. As a consequence tendency for resonant noise generation upon burner ignition is substantially diminished.
- a gas valve adjusted in accordance with air flow is employed.
- the pressure drop across the inner perforated wall 5 is detected.
- a high pressure sensing orifice 12 is located at the outlet of the fan 2, and three alternative arrangements for sensing the low pressure in the sub-chamber 7 between the inner and outer walls 4,5 are shown in Figure 1.
- the low pressure is sensed by an orifice 15 opening through the outer wall 4 at a location below the perforated area of this wall.
- the low pressure is sensed by an orifice 16 opening through the inner wall member below the perforated sections of the two wall members, a tube 17 connected to this orifice being led in a sealed manner out through the double wall structure.
- the pressure is sensed through an orifice 18 in an upper end wall 6 of the inner screen, this orifice being connected to a tube 19 extending along the interior of the burner and then out through a hole in the wall of the fan outlet.
- the invention is applicable to cylindrical burners mounted horizontally as well as cylindrical burners having their axes substantially vertical. Furthermore, the invention is not restricted to cylindrical burners and can be applied to burners of other forms.
- Figure 2 for example there is shown a gas burner embodying the invention and having a substantially flat or planar face at which the flames are produced. More particularly, the burner 20 has a body of rectangular configuration with a perforated top wall 24 with gas ports which could be arranged in a pattern similar to that described above in connection with Figs. 4 to 7 or in any other suitable array.
- an inner wall member 25 mounted in the body and spaced about 1 mm below the wall 24 is an inner wall member 25 also provided with gas ports but providing a smaller aggregate through flow area than the gas ports to the top wall 24, and hence a greater flow resistance.
- a fan 22 delivers a gas and air mixture into the interior of the burner through an inlet in the bottom wall.
- sensing orifices 12 and 13 connected to respective tubes are positioned to sense the high pressure in the body interior and the low pressure in the small volume sub-chamber confined between the walls 24 and 25.
- the burner in Fig 3 is of essentially the same construction as that of Fig. 2 except that is inverted so that the burner is down firing instead of upfiring.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas Burners (AREA)
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9417292 | 1994-08-26 | ||
GB9417292A GB9417292D0 (en) | 1994-08-26 | 1994-08-26 | Gas burners |
GB9500777 | 1995-01-16 | ||
GBGB9500777.9A GB9500777D0 (en) | 1995-01-16 | 1995-01-16 | Gas burners |
GBGB9506615.5A GB9506615D0 (en) | 1995-03-31 | 1995-03-31 | Gas burners |
GB9506615 | 1995-03-31 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0698766A2 true EP0698766A2 (fr) | 1996-02-28 |
EP0698766A3 EP0698766A3 (fr) | 1996-09-04 |
EP0698766B1 EP0698766B1 (fr) | 1998-07-22 |
Family
ID=27267345
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19950305876 Expired - Lifetime EP0698766B1 (fr) | 1994-08-26 | 1995-08-22 | Brûleur à gaz |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0698766B1 (fr) |
DE (1) | DE69503581T2 (fr) |
GB (1) | GB2292794A (fr) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL1003311C2 (nl) * | 1996-06-10 | 1997-12-17 | Radson Alutherm Nv | Vlamverdeelinrichting bestemd voor een brander van een warmwatertoestel. |
NL1005494C2 (nl) * | 1997-03-11 | 1998-09-14 | Fasto Nefit Bv | Gasbrander. |
EP1498658A1 (fr) * | 2003-07-16 | 2005-01-19 | Aeromatix Limited | Brûleurs à gaz |
ES2293768A1 (es) * | 2005-04-11 | 2008-03-16 | Jose Maria Vergara Uranga | Cuerpo de caldeo polivalente. |
ITMI20102181A1 (it) * | 2010-11-24 | 2012-05-25 | Worgas Bruciatori Srl | Bruciatore ad elevata stabilita' |
ITMI20110390A1 (it) * | 2011-03-11 | 2012-09-12 | Bertelli & Partners Srl | Bruciatore a gas perfezionato per combustione premiscelata |
ITVI20110181A1 (it) * | 2011-07-05 | 2013-01-06 | Aldo Polidoro | Bruciatore di gas combustibile |
IT202000002209A1 (it) * | 2020-02-05 | 2021-08-05 | Polidoro S P A | Bruciatore a premiscelamento |
WO2023057937A1 (fr) * | 2021-10-07 | 2023-04-13 | Polidoro S.P.A. | Brûleur à prémélange |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2316479B (en) * | 1996-08-14 | 1999-12-15 | Aeromatic Co Ltd | Improvements in or relating to gas burners |
FR2835042B1 (fr) * | 2002-01-22 | 2004-12-17 | Mer Joseph Le | Bruleur a gaz, a face de combustion bipartite et chaudiere equipee d'un tel bruleur |
DE102008019854A1 (de) * | 2008-04-23 | 2009-10-29 | J. Eberspächer GmbH & Co. KG | Wandstruktur und Brenner sowie System |
DE102012104741A1 (de) * | 2012-06-01 | 2013-12-05 | Ulrich Dreizler | Verfahren zur vollständigen und geräuschreduzierten Verbrennung eines Brennstoff-Luft-Gemisches sowie Brenner hierzu |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB431335A (en) * | 1933-01-02 | 1935-07-01 | Paul Bornkessel | Improvements in or relating to mouthpieces for compressed gas burners |
GB1520402A (en) * | 1974-07-30 | 1978-08-09 | Mitsubishi Electric Corp | Combustion apparatus |
GB2176588B (en) * | 1985-06-13 | 1989-02-08 | British Gas Plc | Fuel fired burner |
EP0309838B1 (fr) * | 1987-09-26 | 1992-03-04 | Ruhrgas Aktiengesellschaft | Brûleur à gaz |
CA2005415C (fr) * | 1989-01-10 | 1994-03-01 | Willie H. Best | Bruleur a gaz a rendement eleve |
US4960335A (en) * | 1989-11-13 | 1990-10-02 | The Timken Company | Unitary enclosure and cover therefor |
GB9013849D0 (en) * | 1990-06-21 | 1990-08-15 | Furigas Uk Ltd | A gas burner |
US5439372A (en) * | 1993-06-28 | 1995-08-08 | Alzeta Corporation | Multiple firing rate zone burner and method |
-
1995
- 1995-08-22 GB GB9517196A patent/GB2292794A/en not_active Withdrawn
- 1995-08-22 DE DE1995603581 patent/DE69503581T2/de not_active Expired - Fee Related
- 1995-08-22 EP EP19950305876 patent/EP0698766B1/fr not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
None |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL1003311C2 (nl) * | 1996-06-10 | 1997-12-17 | Radson Alutherm Nv | Vlamverdeelinrichting bestemd voor een brander van een warmwatertoestel. |
EP0816758A1 (fr) * | 1996-06-10 | 1998-01-07 | N.V. Radson-Alutherm | Dispositif de répartition des flammes pour un brûleur d'un appareil à eau chaude |
NL1005494C2 (nl) * | 1997-03-11 | 1998-09-14 | Fasto Nefit Bv | Gasbrander. |
EP0864813A1 (fr) * | 1997-03-11 | 1998-09-16 | Nefit Fasto B.V. | Brûleur à gaz |
EP1498658A1 (fr) * | 2003-07-16 | 2005-01-19 | Aeromatix Limited | Brûleurs à gaz |
GB2404008A (en) * | 2003-07-16 | 2005-01-19 | Aeromatix Ltd | A burner including a ceramic burner head and an associated baffle |
ES2293768A1 (es) * | 2005-04-11 | 2008-03-16 | Jose Maria Vergara Uranga | Cuerpo de caldeo polivalente. |
WO2012069970A1 (fr) * | 2010-11-24 | 2012-05-31 | Worgas Bruciatori S.R.L. | Brûleur à stabilité élevée |
ITMI20102181A1 (it) * | 2010-11-24 | 2012-05-25 | Worgas Bruciatori Srl | Bruciatore ad elevata stabilita' |
CN103299130A (zh) * | 2010-11-24 | 2013-09-11 | 瓦盖斯燃烧器有限责任公司 | 高稳定性燃烧器 |
US20130302741A1 (en) * | 2010-11-24 | 2013-11-14 | Worgas Bruciatori S.R.L. | High-stability burners |
CN103299130B (zh) * | 2010-11-24 | 2015-12-02 | 瓦盖斯燃烧器有限责任公司 | 高稳定性燃烧器 |
ITMI20110390A1 (it) * | 2011-03-11 | 2012-09-12 | Bertelli & Partners Srl | Bruciatore a gas perfezionato per combustione premiscelata |
WO2012123805A1 (fr) * | 2011-03-11 | 2012-09-20 | Bertelli & Partners S.R.L. | Brûleur à gaz perfectionné pour une combustion prémélangée |
CN103443544A (zh) * | 2011-03-11 | 2013-12-11 | 贝尔泰利联合公司 | 用于预混式燃烧的改进的气体燃烧器 |
ITVI20110181A1 (it) * | 2011-07-05 | 2013-01-06 | Aldo Polidoro | Bruciatore di gas combustibile |
IT202000002209A1 (it) * | 2020-02-05 | 2021-08-05 | Polidoro S P A | Bruciatore a premiscelamento |
WO2023057937A1 (fr) * | 2021-10-07 | 2023-04-13 | Polidoro S.P.A. | Brûleur à prémélange |
Also Published As
Publication number | Publication date |
---|---|
DE69503581T2 (de) | 1999-01-14 |
DE69503581D1 (de) | 1998-08-27 |
EP0698766A3 (fr) | 1996-09-04 |
GB9517196D0 (en) | 1995-10-25 |
EP0698766B1 (fr) | 1998-07-22 |
GB2292794A (en) | 1996-03-06 |
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