US20100116226A1 - Boiler with a combustion head cooling system - Google Patents

Boiler with a combustion head cooling system Download PDF

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Publication number
US20100116226A1
US20100116226A1 US12/514,064 US51406407A US2010116226A1 US 20100116226 A1 US20100116226 A1 US 20100116226A1 US 51406407 A US51406407 A US 51406407A US 2010116226 A1 US2010116226 A1 US 2010116226A1
Authority
US
United States
Prior art keywords
burner
tubes
diffuser
boiler according
boiler
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
US12/514,064
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English (en)
Inventor
Nicola Lovascio
Raffaello Rastelli
Claudio Zatti
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.)
Gas Point Srl
Original Assignee
Gas Point Srl
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 Gas Point Srl filed Critical Gas Point Srl
Assigned to GAS POINT S.R.L. reassignment GAS POINT S.R.L. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LOVASCIO, NICOLA, RASTELLI, RAFFAELLO, ZATTI, CLAUDIO
Publication of US20100116226A1 publication Critical patent/US20100116226A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/40—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes
    • 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
    • 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
    • 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
    • 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
    • F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
    • F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
    • F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners 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
    • F24H8/00—Fluid heaters characterised by means for extracting latent heat from flue gases by means of condensation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/30—Technologies for a more efficient combustion or heat usage

Definitions

  • An embodiment of the present invention relates to a boiler with cooling system of the combustion head of the burner.
  • the present invention relates to a heater with air-gas premixing burner, to which explicit reference will be made in the following description without loosing in generality.
  • boilers with total air-gas premixing burner are designed to work with burners using only combustion air mixed with combustible gas upstream of the combustion head of the burner and, thus, without any contribution of secondary air downstream of the combustion head of the burner.
  • the known boilers with air-gas premixing burners comprise a mixer in which the total air-gas premixing is performed, a fan, a burner, a combustion chamber downstream of the burner, and a heat exchanger which comprises, in turn, a plurality of tubes defining the path of the water in a heating system.
  • the mixer may be located upstream or downstream of the fan according to the choice made by the manufacturer.
  • the boilers of the above-described type may present the severe problem related to the excessive heating of the combustion head of the burner, and specifically the overheating of the diffuser element which represents the part of the combustion head in contact with the flame of the burner.
  • diffusers formed by materials presenting a high resistance to high temperatures which however imply other disadvantages.
  • the diffusers formed by high alloy steel or high-temperature-resistant metallic mesh present the disadvantage of being too expensive
  • the diffusers formed by ceramic material, such as the diffusers of porous matrix or ceramic matrix in addition to being costly, present the disadvantage of being particularly fragile.
  • An embodiment of the present invention is a cooling system for the combustion head of a total air-gas premixing burner, the technical features of which are such to overcome the drawbacks of the known art.
  • the external element of the combustion head of the burner is a diffuser.
  • a plurality of seats adapted to accommodate part of the tubes are obtained in the diffuser element.
  • FIG. 1 is a section of a condensing boiler with total air-gas premixing burner according to an embodiment of the present invention with parts removed for the sake of simplicity;
  • FIG. 2 is an enlarged detail of FIG. 1 ;
  • FIG. 3 is an exploded view of part of FIG. 1 ;
  • FIG. 4 is a section of a non-condensing boiler with total air-gas premixing burner according to an embodiment of the present invention with parts removed for the sake of simplicity.
  • numeral 1 indicates an embodiment of a condensing boiler as a whole.
  • the boiler 1 comprises a fan 2 adapted to blow the air-gas mixtures into a burner 3 arranged underneath the fan 2 it is connected to, a combustion chamber 4 faced by the burner 3 , and a heat exchanger 5 comprising a plurality of tubes 6 in which the water of a heating system (not shown) runs.
  • the burner 3 , the combustion chamber 4 and the heat exchanger 5 are accommodated inside a containing structure 7 , the side walls of which at the combustion chamber 4 are protected by ceramic fiber panels 12 .
  • the burner 3 comprises a covering plate 8 adapted to close the containing structure 7 and presenting a hole 9 for the input of the air-gas mixture from the fan 2 , a baffle 10 arranged at the hole 9 and fixed to the covering plate 8 , and a combustion head 11 , which faces the combustion chamber 4 and comprises a distributor element 14 and a diffuser element 15 .
  • the covering plate 8 is fixed to the structure 7 in reversible manner to open and close the structure 7 itself, while the combustion head 11 is fixed to the covering plate 8 by means of fastening devices 24 and rests on a part of the tubes 6 as described below. In this manner, after having lifted the burner 3 , the combustion chamber 4 may be easily inspected.
  • the distributor element 14 and the diffuser element 15 are constituted by two corresponding appropriately perforated plates, in which the sum of the holes obtained in the distributor element 14 has a total passage surface of generally smaller size than that of the holes obtained in the diffuser element 13 .
  • the distributor 14 and the diffuser 15 are reciprocally coupled with the protrusions 16 a of the diffuser 15 which engage the grooves 16 of the distributor 14 .
  • the heat exchanger 5 at least in the specific embodiment shown in FIG. 1 , comprises a first plurality of circular section tubes 6 a arranged in the upper part of the combustion chamber 4 , and accommodated inside the longitudinal grooves 16 obtained in the diffuser 15 .
  • the boiler 1 comprises a plurality of interposition elements 17 formed by heat-conducting material, such as for example metallic meshes, each of which is positioned between each tube 6 a and the corresponding groove 16 in which it is accommodated.
  • the heat exchanger 5 further comprises a second plurality of elliptical section tubes 6 b arranged in two reciprocally offset rows, and a third plurality of circular section tubes 6 c arranged underneath the tubes 6 b and also arranged on two reciprocally offset rows.
  • the second plurality of tubes 6 b is designed to exploit the heat coming directly from the flame and from the fumes and the latent condensation heat of the combustion fumes
  • the third plurality of tubes 6 c is designed to further exploit the latent condensation heat of the combustion fumes.
  • a plurality of fins 18 is coupled to the tubes 6 b to assist the heat exchange between the fumes and the water.
  • the boiler 1 comprises ignition means of the flame 19 (known and not described in detail).
  • a drain tap through which the fume condensate is evacuated, and an inlet mouth of an evacuation stack of the fumes themselves.
  • numeral 20 shows a non-condensing boiler as a whole, with total premixing according to an embodiment of the present invention.
  • the boiler 20 differs from the boiler 1 both for the total exchanging surface of the exchanger which, having a smaller number of tubes and a smaller exchange fin surface, does not allow the fumes to cool down to the extent of condensing the vapor contained therein, both for the arrangement of the burner and of the heat exchanger, which, the condensate production ceasing, may possibly be arranged with the heat exchanger located over the burner.
  • the combustion chamber 4 may be easily inspectable after extracting the burner 3 downwards, since the burner is also in this case easily removable from the containing structure 7 .
  • the boiler 20 comprises a heat exchanger 21 comprising, in turn, a plurality of tubes 22 in which the water of a heating system (not shown) runs.
  • the plurality of tubes 22 comprise a first type of circular section tubes 22 a accommodated inside the longitudinal grooves 16 obtained in the diffuser 15 with the interposition of interposition elements 17 formed by heat conducting material, and a second type of elliptical section tubes 22 b designed to exploit the heat coming directly from the flame and from the fumes.
  • a plurality of fins 23 is coupled to the tubes 22 b to assist the heat exchange between the fumes and the water.
  • the boiler 20 comprises a pipe 24 for discharging the fumes which in this case will not undergo a condensation process.
  • one or more embodiments of the present invention ensuring a constant cooling of the diffuser, offer the advantage of using diffusers formed by low-cost steel, without, because of this, increasing the complexity of the burner components.
  • the hydraulic circuit responsible for the cooling of the diffuser belongs to the heat exchanger as a whole without, therefore, adding a new hydraulic circuit and the corresponding components.
  • the boiler of an embodiment of the present invention comprising part of the tubes of the heat exchanger in contact with the combustion head of the burner, contemplates a heat exchange directly from the burner estimatable in a fraction ranging from 5% to 15% according to the heat supply developed by the burner itself, with a consequent increase of the total exchange capacity of the exchanger-burner system.
  • the tubes 6 a and 22 a responsible for the cooling of the diffuser 15 may have a different shape from that described above and, above all, may be in direct contact with the diffuser 15 , which may either present different seats from those shown in the description or be entirely free thereof.
  • the tubes 6 a and 22 a responsible for the cooling of the diffuser 15 may be in different number from those described above and at a reciprocally different distance, providing that the number and distance are such to sufficiently cool the diffuser 15 .
  • the reciprocal distance between distributor 14 and diffuser 15 may be different from that shown in the figures, for example, according to the known art.
  • the dimensions of the chamber formed by the covering plate 8 and the distributor 14 may be different from that shown in the figures, for example, according to the known art.
  • the surfaces of the diffuser 15 and of the distributor 14 may be, taken individually, either flat or curved with curving radius facing either inwards or outwards with respect to the burner chamber, in order to allow the displacements deriving from the thermal expansions in a known and predetermined direction.
  • the distributor 14 may be made in one piece or in several pieces coupled to the diffuser 15 so as to prevent the escape of air-gas mixture directly from the chamber inside the burner 3 to the diffuser.
  • the number of holes or slots and the shape of the holes and the slots of the distributor 14 and the diffuser 15 may be variable at will, for example, according to the known art.
  • the distributor 14 and the diffuser 15 may be either rigidly fixed to the covering plate 8 , e.g., by means of the fastening devices 24 , or be coupled to the covering plate 8 by means of the same fastening devices which are used to fasten the covering plate 8 onto the structure 7 , for example, according to the known art.
  • the circulation of water in the tubes 6 a and 22 a may be in series and/or in parallel according to the specific needs of the water circuit of the heating system.

Landscapes

  • 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)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US12/514,064 2006-11-08 2007-11-07 Boiler with a combustion head cooling system Abandoned US20100116226A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT000758A ITBO20060758A1 (it) 2006-11-08 2006-11-08 Caldaia con sistema di raffreddamento della testa di combustione
ITBO2006A000758 2006-11-08
PCT/IB2007/003398 WO2008056238A2 (fr) 2006-11-08 2007-11-07 Chaudière munie d'un système de refroidissement de tête de combustion

Publications (1)

Publication Number Publication Date
US20100116226A1 true US20100116226A1 (en) 2010-05-13

Family

ID=39364889

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/514,064 Abandoned US20100116226A1 (en) 2006-11-08 2007-11-07 Boiler with a combustion head cooling system

Country Status (4)

Country Link
US (1) US20100116226A1 (fr)
EP (1) EP2087295A2 (fr)
IT (1) ITBO20060758A1 (fr)
WO (1) WO2008056238A2 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170211845A1 (en) * 2016-01-25 2017-07-27 Hamilton Engineering, Inc. Device for dispensing a heated fluid
US20180347858A1 (en) * 2012-10-18 2018-12-06 Thermolift, Inc. Combination Solar and Combustion Heater
CN109931691A (zh) * 2017-12-19 2019-06-25 林内株式会社 燃烧装置
CN109931692A (zh) * 2017-12-19 2019-06-25 林内株式会社 燃烧装置
US10527279B2 (en) * 2015-10-20 2020-01-07 Rinnai Corporation Combustion apparatus
US11226133B2 (en) * 2017-05-22 2022-01-18 Noritz Corporation Water heating apparatus
JP7119712B2 (ja) 2018-07-27 2022-08-17 株式会社ノーリツ 燃焼装置および温水装置
US11448472B2 (en) * 2018-12-28 2022-09-20 Kyungdong Navien Co., Ltd. Heat transfer fin and fin-tube type heat exchanger unit using the same
US11835262B2 (en) 2018-06-05 2023-12-05 Kyungdong Navien Co., Ltd. Heat exchanger unit

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1402383B1 (it) * 2010-09-09 2013-09-04 Riello Spa Scambiatore di calore per caldaie a condensazione e caldaia a condensazione provvista di tale scambiatore di calore
PL221028B1 (pl) * 2011-06-24 2016-02-29 Aic Spółka Akcyjna Pakiet rurowy wymiennika ciepła
JP6475092B2 (ja) * 2015-06-01 2019-02-27 リンナイ株式会社 燃焼装置
KR102365698B1 (ko) 2018-06-05 2022-02-22 주식회사 경동나비엔 콘덴싱 보일러

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2119581A (en) * 1936-01-28 1938-06-07 Babcock & Wilcox Co Combination fuel burner
US5201807A (en) * 1992-02-26 1993-04-13 Gas Research Institute Gas-fired water heater
EP1314932A1 (fr) * 2001-11-26 2003-05-28 Worgas Bruciatori S.R.L. Appareil de chauffage
FR2835042A1 (fr) * 2002-01-22 2003-07-25 Mer Joseph Le Bruleur a gaz, a face de combustion bipartite et chaudiere equipee d'un tel bruleur
US20030148240A1 (en) * 2000-02-02 2003-08-07 Feliciano Lasagni Burner provided with means against the overheating of the burner head
US20040182107A1 (en) * 2003-01-29 2004-09-23 Kyeong-Hwa Kang Condenser
US6971335B2 (en) * 2003-08-20 2005-12-06 Paloma Industries, Limited Water heater
US20070000453A1 (en) * 2005-06-29 2007-01-04 Grit Industries Inc. Heat exchange apparatus
US20070204980A1 (en) * 2004-10-13 2007-09-06 Kyungdong Boiler Co., Ltd. Heat Exchanger for Common Use for Boiler and Hot Water Supply

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITBO20050155A1 (it) * 2005-03-15 2006-09-16 Tec Lab So Co Modulo monotermico e bitermico per caldaie murali a condensazione

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2119581A (en) * 1936-01-28 1938-06-07 Babcock & Wilcox Co Combination fuel burner
US5201807A (en) * 1992-02-26 1993-04-13 Gas Research Institute Gas-fired water heater
US20030148240A1 (en) * 2000-02-02 2003-08-07 Feliciano Lasagni Burner provided with means against the overheating of the burner head
EP1314932A1 (fr) * 2001-11-26 2003-05-28 Worgas Bruciatori S.R.L. Appareil de chauffage
FR2835042A1 (fr) * 2002-01-22 2003-07-25 Mer Joseph Le Bruleur a gaz, a face de combustion bipartite et chaudiere equipee d'un tel bruleur
US20040182107A1 (en) * 2003-01-29 2004-09-23 Kyeong-Hwa Kang Condenser
US6971335B2 (en) * 2003-08-20 2005-12-06 Paloma Industries, Limited Water heater
US20070204980A1 (en) * 2004-10-13 2007-09-06 Kyungdong Boiler Co., Ltd. Heat Exchanger for Common Use for Boiler and Hot Water Supply
US20070000453A1 (en) * 2005-06-29 2007-01-04 Grit Industries Inc. Heat exchange apparatus

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180347858A1 (en) * 2012-10-18 2018-12-06 Thermolift, Inc. Combination Solar and Combustion Heater
US10527279B2 (en) * 2015-10-20 2020-01-07 Rinnai Corporation Combustion apparatus
US20170211845A1 (en) * 2016-01-25 2017-07-27 Hamilton Engineering, Inc. Device for dispensing a heated fluid
US11226133B2 (en) * 2017-05-22 2022-01-18 Noritz Corporation Water heating apparatus
US10767901B2 (en) * 2017-12-19 2020-09-08 Rinnai Corporation Combustion apparatus
US10753642B2 (en) * 2017-12-19 2020-08-25 Rinnai Corporation Combustion apparatus
CN109931692A (zh) * 2017-12-19 2019-06-25 林内株式会社 燃烧装置
CN109931691A (zh) * 2017-12-19 2019-06-25 林内株式会社 燃烧装置
US11835262B2 (en) 2018-06-05 2023-12-05 Kyungdong Navien Co., Ltd. Heat exchanger unit
US11835261B2 (en) 2018-06-05 2023-12-05 Kyungdong Navien Co., Ltd. Heat exchanger unit
US11879666B2 (en) 2018-06-05 2024-01-23 Kyungdong Navien Co., Ltd. Heat exchanger unit
JP7119712B2 (ja) 2018-07-27 2022-08-17 株式会社ノーリツ 燃焼装置および温水装置
US11448472B2 (en) * 2018-12-28 2022-09-20 Kyungdong Navien Co., Ltd. Heat transfer fin and fin-tube type heat exchanger unit using the same

Also Published As

Publication number Publication date
WO2008056238A3 (fr) 2008-08-21
WO2008056238A2 (fr) 2008-05-15
EP2087295A2 (fr) 2009-08-12
ITBO20060758A1 (it) 2008-05-09

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AS Assignment

Owner name: GAS POINT S.R.L.,ITALY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LOVASCIO, NICOLA;RASTELLI, RAFFAELLO;ZATTI, CLAUDIO;REEL/FRAME:023560/0189

Effective date: 20091020

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION