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US20150192291A1 - Multi-Cone Fuel Burner Apparatus For Multi-Tube Heat Exchanger - Google Patents

Multi-Cone Fuel Burner Apparatus For Multi-Tube Heat Exchanger Download PDF

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Publication number
US20150192291A1
US20150192291A1 US14/148,204 US201414148204A US2015192291A1 US 20150192291 A1 US20150192291 A1 US 20150192291A1 US 201414148204 A US201414148204 A US 201414148204A US 2015192291 A1 US2015192291 A1 US 2015192291A1
Authority
US
United States
Prior art keywords
fuel
burner
burners
air
support plate
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.)
Abandoned
Application number
US14/148,204
Other languages
English (en)
Inventor
Amin Akbarimonfared
Timothy J. Shellenberger
Darryl J. Farley
Nathan T. Whalen
Trent E. Thompson
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.)
Rheem Manufacturing Co
Original Assignee
Rheem Manufacturing Co
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 Rheem Manufacturing Co filed Critical Rheem Manufacturing Co
Priority to US14/148,204 priority Critical patent/US20150192291A1/en
Assigned to RHEEM MANUFACTURING COMPANY reassignment RHEEM MANUFACTURING COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SHELLENBERGER, TIMOTHY J., FARLEY, DARRYL, THOMPSON, Trent E., WHALEN, NATHAN TAYLOR, AKBARIMONFARED, AMIN
Priority to MX2016008732A priority patent/MX373890B/es
Priority to PCT/US2015/010227 priority patent/WO2015103575A1/en
Priority to CN201580003736.7A priority patent/CN105934638B/zh
Priority to AU2015203977A priority patent/AU2015203977B2/en
Priority to CA2935267A priority patent/CA2935267C/en
Publication of US20150192291A1 publication Critical patent/US20150192291A1/en
Abandoned legal-status Critical Current

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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
    • F23D14/12—Radiant burners
    • F23D14/14—Radiant burners using screens or perforated plates
    • 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
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D23/00—Assemblies of two or more burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D5/00—Hot-air central heating systems; Exhaust gas central heating systems
    • F24D5/02—Hot-air central heating systems; Exhaust gas central heating systems operating with discharge of hot air into the space or area to be heated
    • F24D5/04—Hot-air central heating systems; Exhaust gas central heating systems operating with discharge of hot air into the space or area to be heated with return of the air or the air-heater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/06—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators
    • F24H3/08—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators by tubes
    • F24H3/087—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators by tubes using fluid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1854—Arrangement or mounting of grates or heating means for air heaters
    • F24H9/1877—Arrangement or mounting of combustion heating means, e.g. grates or burners
    • F24H9/1881—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/103—Flame diffusing means using screens
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H2210/00—Burner and heat exchanger are integrated

Definitions

  • the present invention relates generally to fuel-fired heating appliances, such as air heating furnaces, and more particularly provides specially designed combustion apparatus for such fuel-fired heating appliances.
  • a known firing method is to flow a fuel/air mixture into a burner box structure in which a burner structure and an associated igniter structure are disposed and are operative to combust the fuel/air mixture and thereby create hot combustion gases used to heat air (or another fluid as the case may be) for delivery to a location served by the heating appliance.
  • the hot combustion gases are flowed through a series of heat exchanger tubes, externally across which the fluid to be heated is flowed, and then discharged from the heating appliance into a suitable flue structure.
  • FIG. 1 schematically depicts a conventional fuel-fired heating appliance combustion section 10 comprising, from left to right in FIG. 1 , a burner box 12 , a heat exchange housing 14 , and a collector box 16 , joined together as indicated.
  • the burner box 12 forwardly terminates at a rear wall 18 of the heat exchange housing 14
  • the heat exchange housing 14 forwardly terminates at a rear wall 20 of the collector box 16 .
  • a spaced plurality of heat exchanger tubes 22 extend through the interior of the heat exchange housing 14 and have open rear inlet ends 24 supported in corresponding openings in the rear wall 18 of the heat exchange housing 14 , and open front outlet ends 26 supported in corresponding openings in the rear wall 20 of the collector box 16 .
  • the open rear inlet ends 24 of the heat exchanger tubes 22 are interdigitated with imperforate sections 28 of the rear heat exchange housing wall 18 .
  • a draft inducer fan 30 is operatively positioned as shown in the collector box 16 .
  • a representative conventional elongated rectangular flat metal mesh burner 32 is positioned within the burner box 12 in a rearwardly spaced, facing relationship with the open inlet ends 24 of the heat exchanger tubes 22 .
  • Burner 32 is carried within a suitable metal frame 34 (see FIG. 2 ) secured to an interior flange portion 36 of the burner box 12 .
  • a conventional igniter 38 is operatively associated with the flat burner 32 .
  • a flow 40 of pre-mixed fuel and air is forwardly drawn through the burner box 12 to the burner 32 at which point the flow 40 is combusted by the igniter 38 to form along an elongated reaction flame pattern 42 emanating from the front side of the burner 32 .
  • portions of the flame 42 are drawn into the heat exchanger tube inlets 24 and form therein hot combustion gases 44 , while the balance of the flame 42 is directed against the imperforate portions 28 of the rear wall 18 of the heat exchange housing 14 .
  • air 46 (or other fluid as the case may be) is suitably flowed externally across the heat exchanger tubes 22 to create heated air 48 for delivery to a conditioned space served by the heating appliance.
  • the draft inducer fan 30 draws cooled combustion gases 50 from the heat exchanger tube outlet ends 26 , through the interior of the collector box 16 , and then exhausts the cooled combustion gases 50 to a suitable flue.
  • the flat burner 32 by virtue of presenting a fairly large single combustion zone within the burner box 12 , causes a large amount of the created combustion products to exist within and heat up the burner box 12 prior to being drawn through the heat exchanger tubes 22 by the draft inducer fan 30 .
  • High temperatures inside the heating appliance cabinet is not desirable because it can cause problems for the other components and it also is a form of efficiency reducing heat loss.
  • the flat burner 32 has been found to often be a primary source of an undesirable source of operating noise, including ignition noise, structural vibration noise and steady state high frequency noise. Replacing the flat burner 32 with a curved single burner has been found to at least somewhat alleviate the bowing problem of the flat burner, but still can create an unacceptably large level of operational noise when used in a premixed fuel/air combustion application.
  • FIG. 1 is a schematic cross-sectional view through a portion of a conventional flat burner-based combustion section of a fuel-fired heating appliance
  • FIG. 2 is a cross-sectional view through the combustion section taken along line 2 - 2 of FIG. 1 ;
  • FIG. 3 is a schematic cross-sectional view through a portion of a specially designed fuel-fired heating appliance combustion section embodying principles of the present invention
  • FIG. 4 is a front side perspective view of a unique multi-cone burner assembly portion of the FIG. 3 combustion section;
  • FIG. 5 is an exploded perspective view of the FIG. 4 multi-cone burner assembly
  • FIG. 6 is a rear side perspective view of the FIG. 4 multi-cone burner assembly
  • FIG. 7 is a schematic cross-sectional view through a heat exchanger tube portion of the FIG. 3 combustion section.
  • FIG. 8 is a schematic side edge elevational view of an alternate embodiment of the FIG. 4 multi-cone burner assembly.
  • FIG. 3 Cross-sectionally depicted in schematic form in FIG. 3 is a portion of a fuel-fired heating appliance, representatively an air heating furnace 60 , that incorporates therein a premixed fuel/air combustion section 62 embodying principles of the present invention. While the heating appliance 60 is representatively an air heating furnace, principles of the present invention are not limited to furnaces, and could be employed to advantage in a variety of other types of fuel-fired heating appliances including, but not limited to, water heaters, boilers and pool heaters.
  • the combustion section 62 comprises, from left to right in FIG. 3 , a mixing box 64 , a burner box or combustion chamber 66 , a heat exchange housing 68 , and a collector box 70 joined together as indicated.
  • a perforated diffuser plate 72 which may be similar in configuration and operation to the perforated diffuser plate 64 illustrated and described in copending U.S. application Ser. No. 14/084,095 owned by the assignee of the present application.
  • the burner box 66 forwardly terminates at a rear wall 74 of the heat exchange housing 68
  • the heat exchange housing 68 forwardly terminates at a rear wall 76 of the collector box 70 .
  • a spaced plurality of heat exchanger tubes 78 extend through the interior of the heat exchange housing 68 and have open rear inlet ends 80 supported in corresponding openings in the rear wall 74 of the heat exchange housing 68 , and open front outlet ends 82 supported in corresponding openings in the rear wall 84 of the collector box 70 .
  • the open rear inlet ends 80 of the heat exchanger tubes 78 are interdigitated with imperforate sections 86 of the rear heat exchange housing wall 74 .
  • a draft inducer fan 88 is operatively positioned as shown in the collector box 70 .
  • burner assembly 90 is supported within the burner box 66 between the perforated diffuser plate 72 and the open inlet ends 80 of the heat exchanger tubes 78 .
  • burner assembly 90 includes a support structure comprising an elongated rectangular metal support plate 92 , an elongated rectangular metal mesh backing member 94 , and an elongated rectangular metal mounting frame 96 , the backing member 94 being sandwiched as shown between the support plate 92 and the mounting frame 96 .
  • the support plate 92 has front and rear sides 98 and 100 , and five longitudinally spaced circular openings 102 extending therethrough and being joined by slots 104 formed through the support plate 92 .
  • the burner assembly 90 further includes five hollow metal mesh cone-shaped burners 106 pressed, apexes first, forwardly through the circular openings 102 , and projecting forwardly beyond the front support plate side 98 along cone axes 108 .
  • the burners 106 are positioned in the circular support plate openings 102 , they are retained therein by placing the backing member 94 on the rear side 100 of the support plate 92 and securing the mounting frame 96 to a peripheral portion of the support plate 92 , as with suitable fasteners 110 .
  • the conical burners 106 are lit by a suitable igniter 112 illustratively positioned between the bottom two burners 106 as viewed in FIG. 3 .
  • a created flame on either of these two burners is passed to the other four burners via a metal mesh flame carryover structure 114 (see FIG. 4 ) disposed in the support plate slots 104 interconnecting the circular plate openings 102 , and thus interconnecting the burner cones 106 .
  • the plate-mounted burner cones 106 are operatively positioned within the burner box 66 with the burner cones 106 projecting forwardly, apexes-first, toward the heat exchanger tube inlets 80 , the burner cone axes 108 aligned with the tube axes 116 , and the cone burner apexes projecting slightly into the heat exchanger tube inlet ends 80 , by securing the support plate 92 to an interior burner box flange portion 118 over an opening 120 therein.
  • burner assembly 90 While this illustrative positioning of the burner assembly 90 within the burner box 66 positions the burner cone apexes slightly within the heat exchanger tube inlets 80 , the burner assembly could be alternatively positioned somewhat forwardly or rearwardly of its indicated FIG. position within the burner box 66 without departing from principles of the present invention.
  • an initially pre-mixed flow 122 is forwardly drawn by the draft inducer fan 88 through the interior of the mixing box 64 and into the interior of the burner box 66 via the plate perforations 124 to form further mixed flows 126 of the fuel/air mixture that in turn are drawn forwardly into the interiors of the burner cones 106 .
  • the flows 126 of fuel/air mixture entering the burner cones 106 are combusted to create at the burner cones 106 a spaced series of individual flames 128 that are interdigitated with the imperforate sections 86 of the rear wall 74 of the heat exchanger housing 68 and enter the heat exchanger tube inlets 80 .
  • flames 128 are drawn forwardly through the heat exchanger tubes 78 while air 130 (or another type of fluid as the case may be) is suitably flowed externally across the heat exchanger tubes 78 , receives combustion heat therefrom, and is discharged from the heating appliance 60 as heated air.
  • This heat transfer from the heat exchanger tubes 78 to the air 130 cools the hot combustion gases created within the heat exchanger tubes 78 , with the cooled combustion gases 132 entering the interior of the collector box 70 for discharge from the collector box 70 to a suitable flue (not shown) by the draft inducer fan 88 .
  • the use of the specially designed multi-cone burner assembly 90 provides several advantages over the conventional single elongated flat burner 32 shown in FIG. 1 , or a laterally curved version thereof.
  • the flame pattern generated by the multi-cone burner assembly 90 of the present invention is defined by a spaced series of individual flames 128 that directly enter the heat exchanger tubes 78 without appreciably extending across the imperforate portions 86 of the heat exchange housing wall 74 , as compared to the blanketing of the corresponding imperforate wall areas 28 by the single extended flame pattern 42 generated by the conventional flat burner 32 shown in FIG. 1 .
  • This feature of the present invention reduces the inefficiency caused in the FIG. 1 system by undesirably transferring a substantial portion of the generated combustion heat to the burner box 12 instead of to the heat exchanger tubes 22 .
  • the reduction of combustion heat transfer to the burner box 66 diminishes the potential damage to other components of the heating appliance 60 due to combustion heat transferred thereto.
  • the cone burners 106 of the present invention due to their hollow, forwardly projecting configurations, are substantially more dimensionally stable when being fired than the conventional flat burner 32 shown in FIG. 1 which may tend to bow forwardly to its dotted line position during firing, thereby creating undesirable operational noise. This operational noise is substantially reduced, if not entirely eliminated, in the burner assembly 90 of the present invention.
  • the forward extension of the hollow burner cones 106 beyond their supporting structure increases the total active burner surface beyond that of a corresponding number of flat circular burners used in place of the cone burners 106 .
  • the cone burners 106 may be sized to provide generally the same overall burner area of a corresponding single flat burner (such as the flat burner 32 in FIGS. 1 and 2 ), thereby providing the cone burners 106 with operational temperatures similar to that of the single flat burner 32 .
  • burners 106 shown in FIGS. 3-6 are illustratively of hollow conical configurations, the present invention is not limited to conical configurations, and a variety of other hollow, forwardly projecting burner configurations may be utilized if desired without departing from principles of the present invention.
  • an alternate embodiment 90 a of the previously described burner assembly 90 is shown in FIG. 8 .
  • components in the burner assembly 90 a similar to those in burner assembly 90 have been given identical reference numerals to which the subscripts “a” have been appended.
  • the burner assembly 90 a representatively has five spaced apart hollow, generally dome-shaped metal mesh burners 106 a extending through spaced apart circular openings (not visible in FIG. 8 ) in the metal support plate 92 a and projecting forwardly from its front side 98 a .
  • the dome-shaped burners 106 a are interconnected by metal mesh flame carryover sections 114 a disposed in slots (not visible in FIG. 8 ) in the support plate 92 a .
  • the igniter 112 a is representatively disposed between the two rightmost burners 106 a and is operative to create the spaced apart individual burner flames 128 a from the pre-mixed flows 126 a of fuel and air sequentially passing forwardly through the mounting frame 96 a , the perforate backing member 94 a , the circular support plate holes (not visible in FIG. 8 ) and into the interiors of the burners 106 a.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Gas Burners (AREA)
US14/148,204 2014-01-06 2014-01-06 Multi-Cone Fuel Burner Apparatus For Multi-Tube Heat Exchanger Abandoned US20150192291A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US14/148,204 US20150192291A1 (en) 2014-01-06 2014-01-06 Multi-Cone Fuel Burner Apparatus For Multi-Tube Heat Exchanger
MX2016008732A MX373890B (es) 2014-01-06 2015-01-06 Aparato de quemador de combustible de varios conos para intercambiador de calor de varios tubos.
PCT/US2015/010227 WO2015103575A1 (en) 2014-01-06 2015-01-06 Multi-cone fuel burner apparatus for multi-tube heat exchanger
CN201580003736.7A CN105934638B (zh) 2014-01-06 2015-01-06 用于多管换热器的多锥体燃料燃烧器设备
AU2015203977A AU2015203977B2 (en) 2014-01-06 2015-01-06 Multi-cone fuel burner apparatus for multi-tube heat exchanger
CA2935267A CA2935267C (en) 2014-01-06 2015-01-06 Multi-cone fuel burner apparatus for multi-tube heat exchanger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US14/148,204 US20150192291A1 (en) 2014-01-06 2014-01-06 Multi-Cone Fuel Burner Apparatus For Multi-Tube Heat Exchanger

Publications (1)

Publication Number Publication Date
US20150192291A1 true US20150192291A1 (en) 2015-07-09

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ID=53494111

Family Applications (1)

Application Number Title Priority Date Filing Date
US14/148,204 Abandoned US20150192291A1 (en) 2014-01-06 2014-01-06 Multi-Cone Fuel Burner Apparatus For Multi-Tube Heat Exchanger

Country Status (6)

Country Link
US (1) US20150192291A1 (es)
CN (1) CN105934638B (es)
AU (1) AU2015203977B2 (es)
CA (1) CA2935267C (es)
MX (1) MX373890B (es)
WO (1) WO2015103575A1 (es)

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US20160131398A1 (en) * 2014-11-07 2016-05-12 Trane International Inc. Furnace burner holders, cartridges, assemblies and methods for their installation
WO2018227137A1 (en) * 2017-06-08 2018-12-13 Rheem Manugacturing Company Optimized burners for boiler applications
US20190101308A1 (en) * 2017-10-03 2019-04-04 Lennox Industries Inc. PRE-MIX BURNER ASSEMBLY FOR LOW NOx EMISSION FURNACE
WO2019193025A1 (en) * 2018-04-05 2019-10-10 Bekaert Combustion Technology B.V. Conical premix gas burner
US10544961B2 (en) * 2016-02-18 2020-01-28 Lennox Industries Inc. Premix burner internal flue shield
US10697668B2 (en) 2016-02-18 2020-06-30 Lennox Industries Inc. Flue baffle
US10711997B2 (en) 2017-10-03 2020-07-14 Lennox Industries Inc. Burner box liner for low NOx emission furnace
US10711998B2 (en) 2017-10-03 2020-07-14 Lennox Industries Inc. Fresh air intake for low NOx emission furnace
US20210140632A1 (en) * 2019-11-07 2021-05-13 Lg Electronics Inc. Gas furnace
US11162677B2 (en) 2019-01-18 2021-11-02 Lennox Industries Inc. Air intake coupling with noise suppression for low NOx emission furnace
US11428403B2 (en) * 2019-06-14 2022-08-30 Lg Electronics Inc. Gas furnace
US11441785B2 (en) * 2019-05-31 2022-09-13 Lg Electronics Inc. Gas furnace
US11493209B2 (en) * 2020-01-23 2022-11-08 Industrial Ceramic Linings B.V. Liner device for a furnace

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CA2935267C (en) 2018-01-23
MX2016008732A (es) 2016-09-08
CN105934638B (zh) 2019-08-06
AU2015203977A1 (en) 2016-07-07
CN105934638A (zh) 2016-09-07
MX373890B (es) 2020-07-09
CA2935267A1 (en) 2015-07-09
WO2015103575A1 (en) 2015-07-09

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