EP1130319B1 - Gasbefeuerter Wasserkessel - Google Patents

Gasbefeuerter Wasserkessel Download PDF

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Publication number
EP1130319B1
EP1130319B1 EP00200751A EP00200751A EP1130319B1 EP 1130319 B1 EP1130319 B1 EP 1130319B1 EP 00200751 A EP00200751 A EP 00200751A EP 00200751 A EP00200751 A EP 00200751A EP 1130319 B1 EP1130319 B1 EP 1130319B1
Authority
EP
European Patent Office
Prior art keywords
boiler
pressure
tube
venturi
venturi tube
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.)
Expired - Lifetime
Application number
EP00200751A
Other languages
English (en)
French (fr)
Other versions
EP1130319A1 (de
Inventor
Giorgio Ing. Pastorino
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.)
Riello SpA
Original Assignee
Riello 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 Riello SpA filed Critical Riello SpA
Priority to AT00200751T priority Critical patent/ATE296994T1/de
Priority to ES00200751T priority patent/ES2240007T3/es
Priority to DE60020517T priority patent/DE60020517T2/de
Priority to EP00200751A priority patent/EP1130319B1/de
Priority to CN01111246A priority patent/CN1344890A/zh
Publication of EP1130319A1 publication Critical patent/EP1130319A1/de
Application granted granted Critical
Publication of EP1130319B1 publication Critical patent/EP1130319B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N5/188—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N2005/181—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using detectors sensitive to rate of flow of air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • F23N2225/06—Measuring pressure for determining flow

Definitions

  • the present invention relates to a gas boiler.
  • the present invention relates to a gas boiler comprising a tight combustion chamber; an air intake duct connected to the combustion chamber; a gas exhaust duct connected to the combustion chamber; a pressure switch for detecting the flow of the gas exhaust; a tube for acquiring the stationary pressure in the gas exhaust duct; a venturi tube for acquiring the dynamic pressure in the gas tube; and a fan comprising a fan scroll located along the gas exhaust duct.
  • a gas boiler of the above described type is disclosed in EP 790,465, in which the tubes for respectively relieving the dynamic pressure and the static pressure are located along the exhaust duct downwardly from the fan.
  • the above described boiler is efficient in detecting eventual blockage of the gas exhaust duct but it is not particularly reliable in detecting the pressure since the latter is influenced by the natural draught of the exhaust duct and cannot fulfil the requirements of the gas boilers provided with tight combustion chamber.
  • the object of the present invention is to provide a gas boiler having a tight combustion chamber improving its performance and passing the test required by PrEN483, according to which gas boiler of the above mentioned type shall be submitted to a 2 mbar vacuum. Under this condition the gas boiler shall light regularly and the flame shall remain steady
  • FIME fans type GR00680P used for Basic boilers, incorporate the venturi tube (see Fig. 6) and the hooked pressure tube (see Fig. 7) into the scroll.
  • the venturi tube reads a pressure, which is lower than the static pressure present in the scroll and is proportional to the speed of flue gases at that point
  • the choice of the pressure tube position has been of the utmost importance; actually measurements are read by a pressure switch detecting pressure changes.
  • the pressure switch reading shall be stable under normal operating conditions and shall decrease in abnormal operating conditions, in order to assure that the boiler is switched off.
  • the correct signal decrease depends upon the position of the venturi and hooked tubes inside the fan's scroll. Therefore, the location of the two pressure detectors is crucial and required long testing efforts.
  • the venturi shall not be very sensitive to the flows imposed by simulating a suction when the boiler is off (test C5), but shall be highly sensitive to the speed changes of the fluid vein when the fan is operating, thus enabling the boiler to automatically shut-off, in case of either fan malfunctioning or incidental closure of the flue gases exhaust tube.
  • Purpose of the invention is to improve the performance of the tight chamber boiler, passing the tests required by prEN483 standard for C5 configuration.
  • This standard specifies the requirements and test methods for the construction, safety, performance, rational use of power, classification and marking of gas-fired boiler, designed for central heating.
  • C5 configuration is defined by prEN 483 as a system where a type C (tight) boiler is connected, though separate ducts, to two terminal units located in areas having a different pressure. In practice, the following two conditions occur:
  • PrEn 483 states that the exhaust of flue gases for a boiler installed according to this configuration shall be submitted to a 2 mbar vacuum; under these conditions, the machine shall light regularly and the flame shall remain steady.
  • the pressure tube reads a vacuum, changing with the change of the air speed passing through it.
  • the pressure switch is an electromechanical device with a ON position at 100 +/-6 Pa and an OFF position at 72 +/-5 Pa.
  • FIME fans type GR00680P used for Basic boilers, incorporate the venturi tube into the scroll (see Fig.8).
  • the venturi tube reads the pressure intake proportionally to the speed of flue gases, at that point; the vacuum signal thus generated is then detected by the pressure switch. Therefore, it "perceives” a pressure change (PD) generated by two pressure signals coming from the venturi tube and from a static pressure tube (see Fig. 4).
  • PD pressure change
  • the static pressure tube consisted of a straight tube (see Fig.4) taking the signal from flue gases exhaust.
  • the static pressure tube consists only of the positive tube of the pressure switch, reading the vacuum existing in the boiler's air box (see Fig. 3).
  • the minimum PD to be assured during boiler's operation is 120 Pa, in the worst conditions (i.e. tubes of the maximum width and operation at the maximum power).
  • Such PD could be generated by working both on the location of the venturi tube inside the scroll and on the diameter of the venturi throat, which is presently 4.6 +/-0,1 mm.
  • the venturi generates a vacuum signal of approx. 150 Pa.
  • the second pressure sensor of the pressure switch perceives a vacuum of approx. 30 Pa.
  • the signal reaching the pressure switch shall be stable under the normal operating conditions and shall decrease in abnormal operating conditions, in order to assure that boiler goes off.
  • the correct reduction of the signal is typical of the venturi positive action.
  • venturi location inside the fan scroll enables to pass the C5 tests (as per standard prEN483/1998); actually in that position, it is not affected by the air flow caused by the natural draught of the stack, when the boiler is off.
  • the venturi shall not be sensitive to the flows imposed by simulating a suction , when the boiler is off (C5 test), but shall be highly sensitive to the speed changes of the fluid vein when the fan is operating, thus enabling the boiler to automatically shut-off, in case of either fan malfunctioning or incidental closure of the flue gases exhaust.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Chimneys And Flues (AREA)
  • Treating Waste Gases (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Measuring Fluid Pressure (AREA)
  • Incineration Of Waste (AREA)
  • Glass Compositions (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)

Claims (1)

  1. Gasbefeuerter Wasserkessel umfassend:
    eine gasdichte Brennkammer;
    eine an die Brennkammer angeschlossene Lufteinlassleitung (Lufteinlassrohr);
    eine an die Brennkammer angeschlossene Abgasauslassleitung (Abgasauslassrohr);
    ein Druckwächter zum Messen des Abgasflusses; ein Rohr zum Erfassen des stationären Drucks im Abgasrohr;
    ein Venturi-Rohr zum Erfassen des dynamischen Drucks im Gasrohr; und
    ein Gebläse, das eine entlang der Abgasauslassleitung (des Abgasauslassrohrs) platzierte Gebläseschnecke umfasst;
    wobei der Wasserkessel dadurch gekennzeichnet ist, dass das Rohr und das Venturi-Rohr innerhalb der Gebläseschnecke angeordnet sind.
EP00200751A 2000-03-03 2000-03-03 Gasbefeuerter Wasserkessel Expired - Lifetime EP1130319B1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AT00200751T ATE296994T1 (de) 2000-03-03 2000-03-03 Gasbefeuerter wasserkessel
ES00200751T ES2240007T3 (es) 2000-03-03 2000-03-03 Caldera de gas.
DE60020517T DE60020517T2 (de) 2000-03-03 2000-03-03 Gasbefeuerter Wasserkessel
EP00200751A EP1130319B1 (de) 2000-03-03 2000-03-03 Gasbefeuerter Wasserkessel
CN01111246A CN1344890A (zh) 2000-03-03 2001-03-05 文丘里管

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP00200751A EP1130319B1 (de) 2000-03-03 2000-03-03 Gasbefeuerter Wasserkessel

Publications (2)

Publication Number Publication Date
EP1130319A1 EP1130319A1 (de) 2001-09-05
EP1130319B1 true EP1130319B1 (de) 2005-06-01

Family

ID=8171141

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00200751A Expired - Lifetime EP1130319B1 (de) 2000-03-03 2000-03-03 Gasbefeuerter Wasserkessel

Country Status (5)

Country Link
EP (1) EP1130319B1 (de)
CN (1) CN1344890A (de)
AT (1) ATE296994T1 (de)
DE (1) DE60020517T2 (de)
ES (1) ES2240007T3 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20022365A1 (it) * 2002-11-07 2004-05-08 Riello Spa Caldaia
ITVR20070139A1 (it) * 2007-10-08 2009-04-09 Cola S R L Dispositivo di misurazione e di regolazione della portata di aria alimentata alla camera di combustione di apparecchi alimentati a pellets

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0644377B1 (de) * 1993-09-16 1996-10-23 Honeywell B.V. Regeleinrichtung für Gasbrenner
DE19605380A1 (de) * 1996-02-14 1997-08-21 Bosch Gmbh Robert Einrichtung zur Überwachung eines Heizgerätes
IT1287317B1 (it) * 1996-07-12 1998-08-04 Rbl Spa Dispositivo di sicurezza per il controllo della produzione di ossido di carbonio nei bruciatori.
ATE211809T1 (de) * 1997-10-17 2002-01-15 Riello Spa Kombiniertes regelsystem für gas und luft zur verbrennungsregelung eines gasheizkessels

Also Published As

Publication number Publication date
EP1130319A1 (de) 2001-09-05
ES2240007T3 (es) 2005-10-16
CN1344890A (zh) 2002-04-17
ATE296994T1 (de) 2005-06-15
DE60020517T2 (de) 2006-05-04
DE60020517D1 (de) 2005-07-07

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