WO2003087668A1 - Bruleur a gaz ameliore - Google Patents

Bruleur a gaz ameliore Download PDF

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Publication number
WO2003087668A1
WO2003087668A1 PCT/AU2003/000418 AU0300418W WO03087668A1 WO 2003087668 A1 WO2003087668 A1 WO 2003087668A1 AU 0300418 W AU0300418 W AU 0300418W WO 03087668 A1 WO03087668 A1 WO 03087668A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
baffle
outlet
burner
manifold
Prior art date
Application number
PCT/AU2003/000418
Other languages
English (en)
Inventor
Souhel Khanania
Original Assignee
Industrial Engineering Technology Pty Ltd
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 Industrial Engineering Technology Pty Ltd filed Critical Industrial Engineering Technology Pty Ltd
Priority to AU2003213865A priority Critical patent/AU2003213865A1/en
Publication of WO2003087668A1 publication Critical patent/WO2003087668A1/fr

Links

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
    • F23D14/70—Baffles or like flow-disturbing devices
    • 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
    • F23D14/26—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid with provision for a retention flame
    • 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
    • F23D2900/14—Special features of gas burners
    • F23D2900/14641—Special features of gas burners with gas distribution manifolds or bars provided with a plurality of nozzles

Definitions

  • the present invention relates to oven burners and more particularly relates to heavy duty gas burners for use in particular though not exclusively in industrial cooking applications.
  • the present invention relates to an improvement in an oven burner which provides an even bum along the length of the burner and which prevents or reduces poor flame retention.
  • Heavy duty ovens are used in a variety of industrial applications. These ovens include heavy duty gas burners which provide high levels of heat over relatively wide areas. The burners are very effective in mass production cooking applications. Finger snacks such as chips shapes and the like are generally cooked on conveyors which progressively pass the foodstuffs by cooking burners adjacent the conveyor.
  • the known burners suffer from a number of disadvantages which compromise the cooking efficiency and results in uneven cooking of foodstuffs. This is caused by " black spots" along the burner.
  • the main objective in burner design is to ensure flame retention to maximize heating by making sure that the gas keeps the heating flame igmted to maximize flame retention and to eliminate the risk of unwanted black spots which can be caused where the flame leaves its seat.
  • the known burners suffer from the disadvantage that they do not have efficient flame retention qualities and are prone to flame separation. This is in one part due to the inefficient geometry at the gas discharge location of the burners. Flame retention in a gas burner is related to the velocity of the gas flow. When the gas delivery velocity is greater than the bum back or flame retention velocity the flame will lift off When this occurs, the heat produced at the burn source will be reduced as there will be gas which is not ignited because the high gas delivery velocity.
  • United States Patent 5,899,681 to Maughan of May 4, 1999 discloses an atmospheric gas burner assembly for improved flame retention and stability.
  • the gas burner assembly is for connection to a source of gas comprising a burner body having a sidewall and a main gas conduit.
  • the main gas conduit has a burner throat and the sidewall has an inner surface, an outer surface and a top surface.
  • a plurality of primary burner ports are disposed within the sidewall dividing the sidewall into a plurality of sidewall islands.
  • a burner cap is removeably disposed on the sidewall.
  • a plurality of paired opposing ridges are disposed on the top surface of the sidewall wherein a single pair of opposing ridges are disposed on a respective sidewall island so as to define a plurality of carryover slots between the opposing ridges, the top surface and the burner cap.
  • Each carryover slot has an inlet and an outlet
  • the paired ridges comprise a radial taper that narrows from a point adjacent the inner surface of the sidewall to a point adjacent the outer surface of the sidewall such that the flow area at the inlet of the carryover slot has a value that is less than the value of the flow area at the outlet of the carryover slot so as to reduce fuel-air mixture velocity and produce a low velocity, stable carryover flame that reduces the tendency of the main flame to lift.
  • United States Patent 5,915,956 to Kwiatek discloses a gaseous fuel burner with reduced velocity flame generating ports.
  • the burner has a cast aluminum burner base which has a tubular inlet communicating with a cavity formed in an enlarged diameter flange remote from the inlet. The cavity is closed by a east aluminum cap registered against the base.
  • the base and cap are each castellated along the parting line such that the castellatfons are interdigitated. Grooves having semi-circular cross sections and formed radially across the casteltations and the spaces between and close on the parting line to form circular cross section primary flame-generating ports.
  • the castellations on the cap are truncated and tapered to provide flame stabilizing passages adjacent alternate flame-generating ports.
  • the grooves forming the primary flame generating ports are configured to preferably form a converging-diverging nozzle; and, the flame stabilizing passages are formed as a diverging nozzle, both for reducing flow velocity to pressurize flame separation.
  • United States Patent 6,322,354 to Carbone , et al. of November 27, 2001 discloses a stacked dual gas burner which achieves good performance at high firing rates as well as good simmer performance at low firing rates.
  • the stacked dual gas burner includes a main burner and a second (simmer) burner.
  • the main burner and second burner are positioned in a stacked relation in a burner assembly, with the second burner positioned coaxially with and below the main burner.
  • the second burner radius is smaller than the main burner radius, such that a portion of the main burner overhangs the second burner adjacent to the second burner ports. Recirculation underneath the overhanging edge of the main burner above the simmer burner ports helps maintain flame attachment at the second burner ports.
  • a valve may be used to provide separately controllable flows of fuel to each of the main and second burners.
  • the present invention seeks to provide an improved gas burner which overcomes the aforesaid prior art problems associated with tile known burners.
  • the invention provides a gas burner having means which eliminates the tendency of flame separation away from a gas supply to said burner. Further the present invention provides an improved burner which has efficient burning properties, high flame retention and which is free from black spots where burning is eliminated or reduced due to poor flame retention.
  • the present invention comprises:
  • a gas burner including; a manifold in communication with a source of combustible gas, an inlet on said manifold for receiving said gas; at least one outlet from said manifold capable of discharging said gas to at least one combustion zone; at least one baffle adjacent at least one said outlets which deflects gas exiting at least one said outlet; wherein gas from said at least one outlet adjacent said at least one baffle supplements ignition at said at least one other outlet to maintain flame retention .
  • the burner is suitable for use in cooking appliances such as an oven.
  • the baffle causes gas flow from at least one outlet to supplement flow gas flow from at least one other outlet to enhance said ignition, wherein the baffle comprises a longitudinal member which is disposed near a plurality of longitudinally disposed gas discharge outlets.
  • the baffle may contribute to mixing of gas exiting from said at least one outlet with gas exiting from at least one other outlet.
  • the baffle preferably has a generally U shaped profile wherein each leg of said U shape terminates in a splayed portion near the gas outlets and has a free end which contributes to the deflection of said gas exiting said openings.
  • the splayed portions form a narrow opening or constriction through which ignited gas passes and which is preferably constant along the length of said burner.
  • the splayed portions are disposed at an angle so as to prevent gas escape before ignition; wherein the baffle ensures even burning of said gases along the length of the burner .
  • the baffle may be detachably fixed to said manifold such that the opening dimension is defined by an angle of repose of the splayed portions.
  • the gas burner will according to one embodiment, typically comprises a first set of gas discharge openings on a first side of the burner and a second set of gas discharge openings on a second side of said burner; wherein the first and second sets of gas discharge openings face opposite directions.
  • a first of said splayed portions of the baffle is preferably disposed adjacent the first set of gas discharge openings and a second of said splayed portions of the baffle is disposed adjacent the second set of gas discharge openings; wherein an extremity of each splay portion is equidistant from an axis of symmetry of the baffle.
  • the axis of symmetry of the baffle is preferably co axial with an axis of symmetry of said burner and the splay portions are angled to accelerate gas exiting the baffle opening.
  • the baffle ensures flame retention back to each gas outlet.
  • the baffle geometry and configuration including length and splay angle causes the velocity of gas just prior to exiting each of the outlets to be less than or equal to the flame retention velocity of the gas exiting each said outlets; wherein the flame is retained by the baffle back to each said outlets.
  • the flame generated by the burner travels ctrcumferentially along heating walls which extend from near each outlets.
  • the manifold includes a first outlet which discharges gas into a combustion zone of the burner and a second outlet which discharges gas against the baffle thereby directing gas from the second outlet in the direction of gas discharged from the first outlet; wherein the gas from the second outlet supplements ignition of gas from said first outlet to maintain optimal flame retention.
  • the flame retention ensures even an constant heat distribution.
  • the present invention comprises: a gas burner for use in cooking appliances such as an oven; the gas burner including; a manifold in communication with a source of combustible gas, an inlet on said manifold for receiving gas from said source of gas; at least one outlet from said manifold capable of discharging said gas to at least one combustion zone; at least one baffle adjacent at least one said outlets and disposed so as to deflect gas exiting at least one said outlet so as to cause the gas exiting one outlet to supplement gas exiting another outlet; wherein, gas from said at least one outlet adjacent said at least one baffle supplements ignition at said at least one other outlet to maintain flame retention.
  • the present invention comprises: a baffle for a gas burner; the gas burner including; a manifold in communication with a source of combustible gas, an inlet on said manifold for receiving said gas; at least one outlet from said manifold capable of discharging said gas to at least one combustion zone; wherein the baffle is located adjacent at least one said outlets and which deflects gas exiting at least one said outlet; wherein the baffle supplements ignition at said at least one other outlet to maintain optimal flame retention.
  • the baffle causes gas flow from at least one outlet to supplement gas flow from at least one other outlet to enhance said ignition.
  • the baffle causes mixing of gas exiting from the at least one outlet with gas exiting from at least one other outlet.
  • the baffle has a free end which contributes to the deflection of the gas exiting said openings.
  • the splayed portions are disposed at an angle so as to prevent gas escape before ignition; wherein, the baffle ensures even burning of said gases along the length of the burner .
  • the baffle is detachably fixed to said manifold.
  • the present invention comprises : a baffle for use with a gas burner for use in cooking appliances such as an oven; the gas burner including; a manifold in communication with a source of combustible gas, an inlet on said manifold for receiving said gas; at least one outlet from said manifold capable of discharging said gas to at least one combustion zone; wherein said baffle comprises at least one splayed free end disposed adjacent or near at least one said outlets which directs gas exiting one said outlet in the general direction of at. least one other outlet; wherein gas from said at least one outlet adjacent said baffle supplements ignition at said at least one other outlet to maintain flame retention .
  • a free end of the baffle is placed at an angle to an axis of the adjacent outlet between 40 -60 degrees to the vertical or horizontal.
  • a gas burner for use in cooking appliances such as an oven; the gas burner including; a manifold in communication with a source of combustible gas, an inlet on said manifold for receiving said gas; at least one outlet from said manifold capable of discharging said gas to at least one combustion zone; a baffle adjacent at least one said outlets which directs gas exiting one said outlet in the general direction of at least one other outlet; wherein, gas from said at least one outlet adjacent said baffle supplements ignition at said at least one other outlet to maintain flame retention; wherein the manifold includes a first outlet which discharges gas into a combustion zone of said burner and a second outlet which discharges gas against said baffle thereby directing gas from said second outlet in the direction of gas discharged from the first outlet; wherein the gas from said second outlet supplements ignition of gas from said first outlet to maintain optimal flame retention.
  • the present invention comprises: a gas burner for use in cooking appliances such as an oven; the gas burner comprising a generally elongated body including gas delivery outlets thereralong which propagate a flame; a manifold in communication with a source of combustible gas, an inlet on said manifold for receiving said gas; at least one outlet from said manifold capable of discharging said gas to at least one combustion zone; a baffle adjacent at least one said outlets which directs gas exiting one said outlet in the general direction of at least one other outlet; wherein gas from said at least one outlet adjacent said baffle supplements ignition at said at least one other outlet to maintain flame retention .
  • a baffle for use with a gas burner far use in cooking appliances such as an oven the gas burner including; a manifold in communication with a source of combustible gas, an inlet on said manifold for receiving said gas; at least one outlet from said manifold capable of discharging said gas to at least one combustion zone; wherein said baffle comprises at least one splayed free end disposed adjacent or near al least one said outlets which directs gas exiting one said outlet in the general direction of at least one other outlet; wherein gas from said at least one outlet adjacent said baffle supplements ignition at said at least one other outlet to maintain flame retention .
  • a baffle for use with a gas burner for use in cooking appliances such as an oven the gas burner including; a manifold in communication with a source of combustible gas, an inlet on said manifold for receiving said gas; at least one outlet from said manifold capable of discharging said gas to at least one combustion zone; wherein said baffle comprises at least one splayed free end disposed adjacent or near at least one said outlets which directs gas exiting an outlet in a direction so that flame retention is maintained along the length of the burner.
  • the flame retention is enabled by the geometry of the baffle including the splay angle and distance of the splay end from the gas outlet working in conjunction with the burn surface.
  • Figure 1 shows a sketch of a cross section of a combustion zone of a prior art burner.
  • Figure 2 shows a perspective view through a burner according lo a preferred embodiment ;
  • Figure 3 shows a top perspective view of the burner of figure 2.
  • Figure 4 shows an underside perspective view of the burner of figure 2.
  • Burner 1 includes a casting 2 which houses ceramic heat reflector 3. Burner 1 also includes an outlet 4 which discharges combustable gas into a combustion zone 5, Combustion zone 5 further includes a return 6 which directs gas from the outlet 4 along surface 7 to combustions zone 5. Should the velocity of the discharge gas exiting outlet 4 exceed the flame retention velocity, the flame will leap away from the ignition source causing a reduction in heating capability of the gas burner. This will result in black spots causing a reduction in efficiency of heating.
  • the prior art combustion zone 5 of the burner 1 relies on gas flow to be retarded by friction or surface tension between the gas and surface 7 of return 6.
  • the surface tension is generally not sufficient to prevent poor flame retention so black spots are inevitable with the existing burners. Contributing to this poor flame retention are the unfavourable geometry of the return relative to the gas outlet and also the contour of the heating surface. These three parameters must be designed efficiently to maximize flame retention but in the prior art burners there are black spots or in other words areas where the heating in uneven. This compromises the quality of the food product which is cooked by the burner and can lead to consumer resistance to the product.
  • the burner and particularly the burn station shown in figure 1 is merely one example of an inefficient gas burner and the outlet configuration which contributes to poor flame retention.
  • FIG. 2 shows a cross sectional view through a combustion zone of a dual heating station burner 10 according to a preferred embodiment of the invention.
  • Burner 10 includes a manifold 11 which is in communication via pipe 12 with a gas supply line 13.
  • Manifold 11 includes outlets which supply gas to separate combustions zones 14 and 15.
  • Combustion zone 14 is fed by outlets 16 and 17 and combustion zone 15 is fed by outlets 18 and 19.
  • FIG 2 shows a cross section it will be appreciated that there are corresponding out lets preferably evenly spaced along the length of the burner and near each combustion zone.
  • burner 10 is symmetrical about axis 20 the behavior and in particular gas delivery and combustion of the discharge gases at combustion zones 14 and 15 are essentially the same.
  • Baffle 22 will, due to its geometry, angle of repose and width W ( indicated by numeral 31), also have the effect of accelerating gas exiting only one gas outlet such as outlet 16 on its own to ensure that the delivery velocity does not exceed the flame retention velocity thereby maintaining flame retention velocity.
  • Baffle 22 is disposed at an angle which optimizes the supplemental delivery of gas from oudet 17 to combustion zone 14.
  • the angle of flange 23 of baffle 22 may be adjusted according to the particular design of oven manifold to which the baffle is attached but would ideally be within 40 - 60 degrees off the vertical or horizontal.
  • the superstructure of burner 10 of figure 2 comprises an exterior casing 24 of metal defining a recess which receives and retains an insert 25 made of ceramic or other insulating material.
  • Burner 10 has a symmetrical mirror image configuration about line 26 thereby creating the two combustion zones 14 and 15.
  • Casing 24 is thermally isolated from the combustion zones 14 and 15 as a result of which it will not retain flame heat improving safety and reducing contact burn risk.
  • the inclusion of two burners increases the heating area and intensity which is defined by heating surfaces 27 and 28 of inserts 25 and 29.
  • Heating surfaces 27 and 28 are formed by webs which increase surface area and divide the heating surfaces into small heating zones
  • Baffle 22 further includes a second free end flange 30 which operates in the same manner as that described for free end flange 23. Baffle 22 may be detachably fixed to manifold 11 via bolts 32.
  • FIG 3 shows a top perspective view of the burner 10 of figure 2 and including corresponding numbering.
  • Burner 10 includes a manifold 11 which is in communication via pipe 12 with a gas supply line 13.
  • Manifold I I includes outlets which supply gas to separate combustions zones 14 and 15. Gas supplied via manifold 11 exits into combustion zone 14 and 15 whereupon the gas ignites as previously described.
  • FIG. 1 shows an inverted view of the burner assembly 10 of figure 3.
  • Burner 10 includes a manifold 11 which is in communication with a gas supply line 13.
  • Manifold 11 includes outlets which supply gas to separate combustions zones 14 and 15.
  • gas supplied via manifold 11 exits into combustion zone 14 whereupon the gas ignites.

Landscapes

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

Abstract

L'invention concerne un brûleur à gaz (10) qui comprend une rampe (11) communiquant avec une source de gaz combustible, un orifice d'entrée (12) situé sur la rampe (11) et destiné à recevoir le gaz, au moins un orifice de sortie (16, 17) de cette rampe (11) pouvant évacuer le gaz vers au moins une zone de combustion (14, 15), au moins une chicane (22) adjacente à au moins un des orifices de sortie (16, 17) et qui dévie le gaz sortant d'au moins un des orifices de sortie (16, 17). Le gaz provenant du ou des orifices de sortie (16, 17) adjacents au ou aux chicanes (22) fournit l'allumage au ou aux autres orifices de sortie (16, 17) pour maintenir la rétention de la flamme.
PCT/AU2003/000418 2002-04-08 2003-04-08 Bruleur a gaz ameliore WO2003087668A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003213865A AU2003213865A1 (en) 2002-04-08 2003-04-08 Improved gas burner

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPS1611A AUPS161102A0 (en) 2002-04-08 2002-04-08 Improved gas burner
AUPS1611 2002-04-08

Publications (1)

Publication Number Publication Date
WO2003087668A1 true WO2003087668A1 (fr) 2003-10-23

Family

ID=3835189

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2003/000418 WO2003087668A1 (fr) 2002-04-08 2003-04-08 Bruleur a gaz ameliore

Country Status (2)

Country Link
AU (1) AUPS161102A0 (fr)
WO (1) WO2003087668A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8167114B2 (en) 2008-01-03 2012-05-01 Souhel Khanania System and method for product removal
US8201493B2 (en) 2008-01-03 2012-06-19 Souhel Khanania Oven
US10398148B2 (en) 2008-01-03 2019-09-03 Souhel Khanania Oven

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2626656A (en) * 1947-04-16 1953-01-27 De Witt H Wyatt Gas burner and internal baffle for gas distribution
GB2226124A (en) * 1988-12-08 1990-06-20 Frymaster Corp Flashback resistant infrared gas burner apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2626656A (en) * 1947-04-16 1953-01-27 De Witt H Wyatt Gas burner and internal baffle for gas distribution
GB2226124A (en) * 1988-12-08 1990-06-20 Frymaster Corp Flashback resistant infrared gas burner apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8167114B2 (en) 2008-01-03 2012-05-01 Souhel Khanania System and method for product removal
US8201493B2 (en) 2008-01-03 2012-06-19 Souhel Khanania Oven
US8869971B2 (en) 2008-01-03 2014-10-28 Souhel Khanania System and method for product removal
US10398148B2 (en) 2008-01-03 2019-09-03 Souhel Khanania Oven
US10794598B2 (en) 2008-01-03 2020-10-06 Souhel Khanania Oven

Also Published As

Publication number Publication date
AUPS161102A0 (en) 2002-05-16

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