EP0811811A2 - Wandheizkessel mit abgeschlossener Brennkammer - Google Patents

Wandheizkessel mit abgeschlossener Brennkammer Download PDF

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Publication number
EP0811811A2
EP0811811A2 EP96115437A EP96115437A EP0811811A2 EP 0811811 A2 EP0811811 A2 EP 0811811A2 EP 96115437 A EP96115437 A EP 96115437A EP 96115437 A EP96115437 A EP 96115437A EP 0811811 A2 EP0811811 A2 EP 0811811A2
Authority
EP
European Patent Office
Prior art keywords
boiler
combustion
chamber
combustion air
sealed
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.)
Withdrawn
Application number
EP96115437A
Other languages
English (en)
French (fr)
Other versions
EP0811811A3 (de
Inventor
Lamberto Del Grosso
Livio Baggio
Giovanni Merlo
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.)
BAXI S.P.A.
Original Assignee
OCEAN IDROCLIMA SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by OCEAN IDROCLIMA SpA filed Critical OCEAN IDROCLIMA SpA
Publication of EP0811811A2 publication Critical patent/EP0811811A2/de
Publication of EP0811811A3 publication Critical patent/EP0811811A3/de
Withdrawn legal-status Critical Current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
    • F24H9/00—Details
    • F24H9/02—Casings; Cover lids; Ornamental panels
    • 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
    • F24H2203/00—** to be deleted **

Definitions

  • This invention relates to a forced-draught wall-mounted boiler provided with an an atmospheric gas burner, a fan and a sealed combustion chamber.
  • Burners of atmospheric type are used both on natural-draught boilers and on forced-draught boilers provided with a fan and a sealed combustion chamber.
  • the particular design of atmospheric boilers operating with primary and secondary air requires the combustion to take place with an excess of secondary air and a consequent high combustion temperature. This excess air, when in the presence of a high temperature, causes the nitrogen molecules contained in the air to split during combustion, so that they combine with the oxygen and lead to an undesirably high emission of NOx.
  • One method for reducing NOx emission is to provide an atmospheric burner operating mainly with primary air.
  • This type of burner operates correctly if applied to natural-draught boilers, in that the combustion air reaches the venturi slowly and uniformly.
  • forced-draught boilers of sealed chamber type these latter may not operate correctly because the combustion air drawn in by the fan enters on the opposite side to that housing the burner venturi, so that it is compelled to graze all the surfaces of the components present within the sealed casing of the boiler, with consequent creation of high turbulence regions opposed by excessively calm regions.
  • This unbalance means that the combustion air reaches the burner in a disordered, excessively turbulent and non-uniform manner. This makes its entry into the burner venturis difficult, leading to poor combustion and a disordered flame face.
  • An object of the present invention is to improve forced-draught boilers provided with an atmospheric gas burner, fan and sealed combustion chamber, in such a manner as to improve combustion and obtain an ordered flame face stable under the various conditions, and with substantially reduced NOx emission.
  • the reference numeral 1 indicates overall the wall-mounted boiler of the invention. It comprises a sealed body or casing 2 with a connector 3 for combustion air entry and a connector 4 for burnt gas discharge positioned centrally on its upper side.
  • the connector 3 opens into a plenum chamber 5 bounded by walls 6 (extending towards the interior) and by the upper wall 7 and rear wall 8 of the casing.
  • the manifold 10 opens at 12 into a duct 13 which, as can be seen in Figures 1 and 3, is substantially box-shaped and extends along one side of the conventional sealed combustion chamber 14 to open at the bottom at 15, at the level of the atmospheric burner unit 16.
  • the manifold 11 opens at 17 into a duct 18, symmetrical to the duct 13 and extending along the opposite side of the combustion chamber 14 to open at 19 at the level of the burner unit 16.
  • the reference numeral 20 indicates a conventional heat exchanger and 21 indicates a conventional suction fan unit, the delivery side of which is connected to the burnt gas discharge connector 4.
  • the described boiler is connected via the connectors 3 and 4 to concentric pipes 22 leading to the outside via the wall 23 of a building, to open externally via spaced-apart exits 24, 25, the more outer 25 of which is for burnt gas discharge.
  • the boiler 1A shown in Figures 4 to 6 differs from the preceding merely in that the combustion air entry connector 3A is not concentric with but separated from the burnt gas discharge connector 4A, to allow the combustion air to be drawn in, and the products of combustion to be discharged, via two separate pipes 30, 31 respectively, which open at different points in the example shown in Figure 6, namely in the external environment and in a chimney or the like 32.
  • the combustion air flows in an ordered and uniform manner into the region in which the burner unit 16 is located.
  • the boiler which operates mainly on primary air, operates under the same conditions as a natural-draught boiler.
  • the boiler in order to satisfy emission regulations, in case a fault should occur in the fan velocity control device, the boiler must be provided with special safety devices which prevent it operating with emissions exceeding the allowable value.
  • the described combustion air plenum, conveying and distribution devices not only create an environment suitable for the operation of an atmospheric burner with mainly primary air, but also, in the case of a fault developing in the fan velocity control device, prevent emissions exceeding the allowable limits, without the use of additional safety systems.
  • sealed chamber boilers can generally be arranged for connection to the following discharge and suction systems.
  • known boilers with a sealed chamber provided with an atmospheric burner operating mainly with primary air can operate adequately only with the coaxial discharge-suction system, after mounting suitable registers on the gas discharge or on the combustion air feed, of size depending on the system length.
  • the split discharge-suction system does not allow correct operation of known boilers because there may be unbalance between the combustion air inlet pressure and the outlet pressure of the products of combustion, with consequent poor combustion air distribution to the burner venturis.
  • the means of the present invention enable a boiler with a sealed chamber and atmospheric burner operating mainly with primary air to be formed which can be connected to either coaxial or split discharge-suction devices of the normal length used for traditional boilers and without mounting registers.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Supply (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
  • Building Environments (AREA)
  • Roof Covering Using Slabs Or Stiff Sheets (AREA)
EP96115437A 1996-06-07 1996-09-26 Wandheizkessel mit abgeschlossener Brennkammer Withdrawn EP0811811A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT96MI001173A IT1283114B1 (it) 1996-06-07 1996-06-07 Caldaia murale a camera stagna
ITMI961173 1996-06-07

Publications (2)

Publication Number Publication Date
EP0811811A2 true EP0811811A2 (de) 1997-12-10
EP0811811A3 EP0811811A3 (de) 1998-12-09

Family

ID=11374398

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96115437A Withdrawn EP0811811A3 (de) 1996-06-07 1996-09-26 Wandheizkessel mit abgeschlossener Brennkammer

Country Status (2)

Country Link
EP (1) EP0811811A3 (de)
IT (1) IT1283114B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10351117B3 (de) * 2003-11-03 2005-02-17 Abb Research Ltd. Drehtransformator

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7904813A (nl) * 1978-12-22 1980-06-24 Nederlandse Gasunie Nv Stookinrichting voor centrale verwarming.
NL8000460A (nl) * 1980-01-24 1981-08-17 Laurentius Cornelis Johannes L Verwarmingsinrichting.
EP0323921A1 (de) * 1988-01-05 1989-07-12 SAUNIER DUVAL EAU CHAUDE CHAUFFAGE S.D.E.C.C. - Société anonyme Gasheizkessel des gasdichten Typs mit verstellbarem Abgasventilator und damit verbundenen von einem Druckschalter Überwachten Sicherheitssystem

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7904813A (nl) * 1978-12-22 1980-06-24 Nederlandse Gasunie Nv Stookinrichting voor centrale verwarming.
NL8000460A (nl) * 1980-01-24 1981-08-17 Laurentius Cornelis Johannes L Verwarmingsinrichting.
EP0323921A1 (de) * 1988-01-05 1989-07-12 SAUNIER DUVAL EAU CHAUDE CHAUFFAGE S.D.E.C.C. - Société anonyme Gasheizkessel des gasdichten Typs mit verstellbarem Abgasventilator und damit verbundenen von einem Druckschalter Überwachten Sicherheitssystem

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10351117B3 (de) * 2003-11-03 2005-02-17 Abb Research Ltd. Drehtransformator

Also Published As

Publication number Publication date
IT1283114B1 (it) 1998-04-07
ITMI961173A1 (it) 1997-12-07
ITMI961173A0 (it) 1996-06-07
EP0811811A3 (de) 1998-12-09

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