WO2009047249A2 - Dispositif de mesure et de réglage du débit d'air transmis à la chambre de combustion de dispositifs alimentés en pastilles de combustible - Google Patents

Dispositif de mesure et de réglage du débit d'air transmis à la chambre de combustion de dispositifs alimentés en pastilles de combustible Download PDF

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Publication number
WO2009047249A2
WO2009047249A2 PCT/EP2008/063396 EP2008063396W WO2009047249A2 WO 2009047249 A2 WO2009047249 A2 WO 2009047249A2 EP 2008063396 W EP2008063396 W EP 2008063396W WO 2009047249 A2 WO2009047249 A2 WO 2009047249A2
Authority
WO
WIPO (PCT)
Prior art keywords
measurement
adjustment device
combustion chamber
pressure transducer
pressure
Prior art date
Application number
PCT/EP2008/063396
Other languages
English (en)
Other versions
WO2009047249A3 (fr
Inventor
Dante Ferroli
Original Assignee
Cola S.R.L.
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 Cola S.R.L. filed Critical Cola S.R.L.
Priority to EP08838269A priority Critical patent/EP2210046A2/fr
Publication of WO2009047249A2 publication Critical patent/WO2009047249A2/fr
Publication of WO2009047249A3 publication Critical patent/WO2009047249A3/fr

Links

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
    • F23N5/184—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using electronic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G01F1/40—Details of construction of the flow constriction devices
    • G01F1/44—Venturi tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2900/00—Special features of, or arrangements for controlling combustion
    • F23N2900/05181—Controlling air to fuel ratio by using a single differential pressure detector

Definitions

  • the present invention relates to a device for measuring and adjusting the flow-rate of air supplied to the combustion chamber of apparatuses such as for example pellet-fueled stoves or boilers and, consequently, the pressure inside the combustion chamber.
  • pellet-fueled stoves have, proximate to the combustion chamber, a vacuum gauge, such as a pressure transducer, which is suitable to allow, generally during installation, to act on the operating parameters of the stove in order to make the combustion process efficient and optimum.
  • a vacuum gauge such as a pressure transducer
  • the measurement head (or nozzle) of the vacuum gauge is arranged proximate to the exhaust fumes evacuation region: accordingly, it is observed that the measurement nozzle rapidly becomes dirty, with an evident deterioration of measurement precision.
  • the aim of the present invention is to provide a device for measuring and adjusting the flow-rate of air supplied to the combustion chamber of pellet-fueled apparatuses, which is capable of eliminating, or at least reducing drastically, the drawbacks cited above that occur in the vacuum gauges currently used.
  • an object of the present invention is to provide a measurement and adjustment device that can operate effectively, limiting the risk that it might become dirty.
  • Another object of the present invention is to devise a measurement and adjustment device that is particularly reliable.
  • a further object of the present invention is to ensure fully the safety of the apparatus in all operating conditions and to optimize the operating parameters as the external conditions vary.
  • Still another object of the invention is to devise a measurement and adjustment device that has a very simple structure and has a particularly competitive production and especially management cost, so that its use is advantageous also from an economical standpoint.
  • a device for measuring and adjusting the flow-rate of the air supplied to the combustion chamber of pellet-fueled apparatuses characterized in that it comprises, along the intake duct of the air to be fed to said combustion chamber, a Venturi tube that is designed to be crossed by the stream of air, a sensor associated with a pressure transducer being arranged along said Venturi tube.
  • Figure 1 is a perspective view, in phantom lines, of a measurement device according to the invention that is associated with an intake duct;
  • Figure 2 is a side elevation view of the device shown in Figure 1 ;
  • Figure 3 is a longitudinal sectional view, taken along a diametrical plane, of the intake duct associated with the measurement device according to the invention
  • Figure 4 is a sectional view of the intake duct, taken along the plane of arrangement defined by the line IV-IV of Figure 3.
  • a device for measuring and adjusting the flow-rate of the air supplied to a combustion chamber of pellet-fueled apparatuses such as stoves or boilers is generally designated by the reference numeral 1 and comprises, along an intake duct 2 for the air to be fed to the combustion chamber, a Venturi tube 3.
  • the Venturi tube 3 is arranged so that its longitudinal extension is parallel to the longitudinal extension of the intake duct 2.
  • the intake duct 2 extends between an intake port 2a, which is generally arranged outside the space to be heated, and a delivery port 2b, which has a fluid connection to the combustion chamber.
  • the Venturi tube 3 is designed to be crossed at one end by portion of the supply air stream that passes through the intake duct 2 and is designed to supply the combustion chamber of the stove or boiler.
  • a first sensor 4 is arranged along the Venturi tube 3 and is connected to a first pressure transducer 7.
  • the first sensor 4 allows to measure the pressure, and consequently the speed, of the air stream in the Venturi tube 3. It has been found that it is particularly advantageous to arrange the first sensor 4 proximate to a choke 3 a provided along the longitudinal extension of the Venturi tube 3.
  • Venturi tube 3 the flow-rate of air supplied to the combustion chamber of the stove or boiler and the pressure (partial vacuum) in said chamber.
  • the first sensor 4 can be constituted by a nozzle 5, which is connected, for example by means of a tube 6 made of silicone or other heat-resistant flexible material, to the first pressure transducer 7.
  • the first pressure transducer 7 can be constituted for example by a mechanical pressure detector but also advantageously by a digital pressure gauge.
  • the digital pressure gauge can be provided by means of an electronic board integrated with a pressure sensor.
  • a second sensor 9 which also is connected to the first pressure transducer 7, for example by means of a second silicone tube 6a.
  • first pressure transducer 7 is a so-called “differential transducer”. However, it is evident that the same functionality can be obtained by connecting the first sensor 4 to the first transducer 7 and by connecting the second sensor 9 to a second pressure transducer.
  • the first and second pressure transducers which in this case are so- called “absolute transducers”, in this case can be associated with a device for comparing the absolute pressure values that are measured, so as to be able to provide in practice the difference in pressure between what is measured by the second sensor 9 and by the first sensor 4.
  • the pressure transducer 7 is connected to a control unit 8, which is designed to receive the data measured by the pressure transducer 7 and is adapted to act, on the basis of programs or tables, on the combustion parameters of the pellet-fueled apparatus.
  • the same control unit 8 can have as inputs, in addition to the pressure values, and therefore the values of the flow-rate of air in input to the combustion chamber, a set of measurements which, combined with each other or with the flow-rate value, can be used to optimize automatically the operating parameters, and particularly the combustion parameters, of the apparatus.
  • a diaphragm ring 12 which is designed to define the port for the passage of the air fed to the combustion chamber.
  • a typical example of operating cycle provides that when the stove is started, the control unit 8, conveniently consisting of an electronic control unit provided with an integrated software program, checks, by reading the input values of the various probes, the condition of the stack, of the door for accessing the combustion chamber, and whether the intake duct and the combustion fumes discharge and extraction tubes are clear. Once the combustion fumes extraction fan is operating, the control unit checks that all the data in input are correct and gradually increases its speed until the first sensor 4 provides a value that ensures that a partial vacuum within the combustion chamber corresponds to a reference value (for example 40 pascals). In practice, during this step, the control unit 8 acts on the device for controlling the speed of the exhaust fumes extraction fan in order to ensure, as mentioned, that inside the combustion chamber it is equal to the reference value of this step.
  • a reference value for example 40 pascals
  • the control unit 8 activates the pellet loading function within the ignition brazier, and simultaneously the combustion fumes extraction fan increases its own speed (and therefore the flow-rate of the extractor) until the control unit 8 detects, by processing the data received from the pressure transducer 7, an optimum value of the partial vacuum within the combustion chamber, said value being, by way of example, 70 pascals.
  • the combustion fumes extraction fan further increases its own speed in order to further reduce the pressure within the combustion chamber until the control unit detects, within such chamber, a combustion start partial vacuum of substantially 65 pascals.
  • control unit 8 acts again on the speed of the combustion fumes extraction fan in order to stabilize the flame, bringing the partial vacuum within the combustion chamber to a stabilization value of 56 pascals.
  • the indicated pressure, or rather, partial vacuum values can vary as a function of the apparatus in which they are installed, on the installation conditions, for example the draft of the stack, and on the operating conditions, for example the cleaning of said apparatus.
  • control unit 8 then increases or decreases the speed of the combustion fumes extraction fan.
  • the second sensor 9 connected to the pressure transducer 7 can be used to detect anomalies in intake.
  • the materials used, as well as the contingent shapes and dimensions may be any according to requirements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Feeding And Controlling Fuel (AREA)

Abstract

La présente invention concerne un dispositif (1) de mesure et de réglage du débit d'air transmis à la chambre de combustion d'appareils alimentés en pastilles de combustible. Ledit dispositif comprend, le long d'un conduit d'admission (2) de l'air qui doit être transmis à la chambre de combustion, un tube de Venturi (3) qui est conçu pour être traversé par le flot d'air, un capteur (4) associé à un transducteur de pression (7) qui est disposé le long du tube de Venturi (3).
PCT/EP2008/063396 2007-10-08 2008-10-07 Dispositif de mesure et de réglage du débit d'air transmis à la chambre de combustion de dispositifs alimentés en pastilles de combustible WO2009047249A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08838269A EP2210046A2 (fr) 2007-10-08 2008-10-07 Dispositif de mesure et de réglage du débit d'air transmis à la chambre de combustion de dispositifs alimentés en pastilles de combustible

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVR2007A000139 2007-10-08
ITVR20070139 ITVR20070139A1 (it) 2007-10-08 2007-10-08 Dispositivo di misurazione e di regolazione della portata di aria alimentata alla camera di combustione di apparecchi alimentati a pellets

Publications (2)

Publication Number Publication Date
WO2009047249A2 true WO2009047249A2 (fr) 2009-04-16
WO2009047249A3 WO2009047249A3 (fr) 2009-09-03

Family

ID=40251847

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/063396 WO2009047249A2 (fr) 2007-10-08 2008-10-07 Dispositif de mesure et de réglage du débit d'air transmis à la chambre de combustion de dispositifs alimentés en pastilles de combustible

Country Status (3)

Country Link
EP (1) EP2210046A2 (fr)
IT (1) ITVR20070139A1 (fr)
WO (1) WO2009047249A2 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20100632A1 (it) * 2010-04-14 2011-10-15 Tecno Cover S R L Metodo e apparato per il controllo della combustione in una caldaia o stufa e caldaia o stufa comprendente detto apparato
ITUD20110021A1 (it) * 2011-02-16 2012-08-17 Palazzetti Lelio Spa Dispositivo e procedimento per controllare la combustione in un'apparecchiatura di riscaldamento
US9103288B2 (en) 2013-09-26 2015-08-11 Ford Global Technologies, Llc Parallel aspirator arrangement for vacuum generation and compressor bypass
US9382825B2 (en) 2013-04-25 2016-07-05 Ford Global Technologies, Llc System and method for gas purge control
US9404453B2 (en) 2013-08-08 2016-08-02 Ford Global Technologies, Llc Systems and methods for multiple aspirators for a constant pump rate
CN107631766A (zh) * 2017-09-14 2018-01-26 国网山西省电力公司电力科学研究院 火电厂一次风道中文丘里风量测量管的在线吹扫系统

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2588639A1 (fr) * 1985-10-15 1987-04-17 Gaz De France Procede d'interruption automatique du fonctionnement d'une ou plusieurs chaudieres et dispositif comportant application de ce procede
JPS63204017A (ja) * 1987-02-20 1988-08-23 Matsushita Electric Ind Co Ltd 燃焼装置
FR2687212A1 (fr) * 1992-02-06 1993-08-13 Chaffoteaux Et Maury Perfectionnements aux dispositifs de securite pour chaudieres a gaz a flux force d'air ou analogues.
US5613479A (en) * 1995-12-08 1997-03-25 Ford Motor Company Pressure feedback exhaust gas recirculation system
US5873356A (en) * 1995-06-26 1999-02-23 Control Options, Inc. High efficiency wood pellet stove
WO1999036747A1 (fr) * 1998-01-13 1999-07-22 Rosemount Inc. Debitmetre a friction
EP1130319A1 (fr) * 2000-03-03 2001-09-05 IABER S.p.A. Tuyau de venturi
WO2001071289A1 (fr) * 2000-03-21 2001-09-27 Broen Armatur A/S Clapet de commande
DE20216653U1 (de) * 2002-10-19 2003-01-16 Wodtke Gmbh Ofen oder Kleinfeuerungsanlage
DE202004020320U1 (de) * 2004-01-22 2005-04-21 Bbt Thermotechnik Gmbh Festbrennstoffkessel
US7004084B1 (en) * 2002-08-05 2006-02-28 Anderson C Merton Corn burner

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3889536A (en) * 1973-03-29 1975-06-17 Wehr Corp Flow measuring and monitoring apparatus

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2588639A1 (fr) * 1985-10-15 1987-04-17 Gaz De France Procede d'interruption automatique du fonctionnement d'une ou plusieurs chaudieres et dispositif comportant application de ce procede
JPS63204017A (ja) * 1987-02-20 1988-08-23 Matsushita Electric Ind Co Ltd 燃焼装置
FR2687212A1 (fr) * 1992-02-06 1993-08-13 Chaffoteaux Et Maury Perfectionnements aux dispositifs de securite pour chaudieres a gaz a flux force d'air ou analogues.
US5873356A (en) * 1995-06-26 1999-02-23 Control Options, Inc. High efficiency wood pellet stove
US5613479A (en) * 1995-12-08 1997-03-25 Ford Motor Company Pressure feedback exhaust gas recirculation system
WO1999036747A1 (fr) * 1998-01-13 1999-07-22 Rosemount Inc. Debitmetre a friction
EP1130319A1 (fr) * 2000-03-03 2001-09-05 IABER S.p.A. Tuyau de venturi
WO2001071289A1 (fr) * 2000-03-21 2001-09-27 Broen Armatur A/S Clapet de commande
US7004084B1 (en) * 2002-08-05 2006-02-28 Anderson C Merton Corn burner
DE20216653U1 (de) * 2002-10-19 2003-01-16 Wodtke Gmbh Ofen oder Kleinfeuerungsanlage
DE202004020320U1 (de) * 2004-01-22 2005-04-21 Bbt Thermotechnik Gmbh Festbrennstoffkessel

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20100632A1 (it) * 2010-04-14 2011-10-15 Tecno Cover S R L Metodo e apparato per il controllo della combustione in una caldaia o stufa e caldaia o stufa comprendente detto apparato
ITUD20110021A1 (it) * 2011-02-16 2012-08-17 Palazzetti Lelio Spa Dispositivo e procedimento per controllare la combustione in un'apparecchiatura di riscaldamento
EP2489933A1 (fr) 2011-02-16 2012-08-22 Palazzetti Lelio Spa Dispositif et procédé de contrôle de combustion dans un appareil de chauffage
US9382825B2 (en) 2013-04-25 2016-07-05 Ford Global Technologies, Llc System and method for gas purge control
US9404453B2 (en) 2013-08-08 2016-08-02 Ford Global Technologies, Llc Systems and methods for multiple aspirators for a constant pump rate
US10208679B2 (en) 2013-08-08 2019-02-19 Ford Global Technologies, Llc Systems and methods for multiple aspirators for a constant pump rate
US9103288B2 (en) 2013-09-26 2015-08-11 Ford Global Technologies, Llc Parallel aspirator arrangement for vacuum generation and compressor bypass
CN107631766A (zh) * 2017-09-14 2018-01-26 国网山西省电力公司电力科学研究院 火电厂一次风道中文丘里风量测量管的在线吹扫系统

Also Published As

Publication number Publication date
ITVR20070139A1 (it) 2009-04-09
WO2009047249A3 (fr) 2009-09-03
EP2210046A2 (fr) 2010-07-28

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