EP0682210A1 - Verbrennungsregeleinrichtung - Google Patents

Verbrennungsregeleinrichtung Download PDF

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Publication number
EP0682210A1
EP0682210A1 EP95103639A EP95103639A EP0682210A1 EP 0682210 A1 EP0682210 A1 EP 0682210A1 EP 95103639 A EP95103639 A EP 95103639A EP 95103639 A EP95103639 A EP 95103639A EP 0682210 A1 EP0682210 A1 EP 0682210A1
Authority
EP
European Patent Office
Prior art keywords
flow
amount
duct
flame vibration
combustion
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.)
Granted
Application number
EP95103639A
Other languages
English (en)
French (fr)
Other versions
EP0682210B1 (de
Inventor
Kazuo C/O Yamatake-Honeywell Co. Ltd. Seki
Yasuji C/O Yamatake-Honeywell Co. Ltd. Morita
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.)
Azbil Corp
Original Assignee
Azbil Corp
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 Azbil Corp filed Critical Azbil Corp
Publication of EP0682210A1 publication Critical patent/EP0682210A1/de
Application granted granted Critical
Publication of EP0682210B1 publication Critical patent/EP0682210B1/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
    • F23N5/184—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/16—Systems for controlling combustion using noise-sensitive detectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/06—Ventilators at the air intake
    • F23N2233/08—Ventilators at the air intake with variable speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/02—Air or combustion gas valves or dampers
    • F23N2235/06—Air or combustion gas valves or dampers at the air intake
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/16—Fuel valves variable flow or proportional valves

Definitions

  • the present invention relates to a combustion control apparatus for preventing flame vibration which occurs in a burning appliance, for example, a gas combustion type hot water supply system.
  • gas combustion type hot water systems which mixes combustion air supplied from a fan motor, provided on an end of a duct and gas (city gas, propane gas), and burns them in order to obtain hot water through a heat exchanger mounted beside the burner, for example.
  • flame vibration which means expansion and contraction of flame from the burner, occurs in a hot water supply system which locally heats combustion air flowing within a duct. If flame vibration occurs, uncomfortable noise is generated. Depending on situations, a burner or a heat exchanger may be damaged. There is such a method in order to prevent flame vibration available as determines whether or not flame vibration occurs by detecting vibration of fire current flowing between the surface of a burner and a heat exchanger and controlling the condition of combustion depending on the vibration of the fire current.
  • an object of the present invention is to solve the aforementioned problem and provide a combustion control apparatus capable of effectively preventing flame vibration by controlling the condition of combustion depending on the amplitude of flame vibration.
  • the combustion control apparatus of the present invention is provided with a detecting means for detecting the amount of flow of combustion air flowing through a duct, the detecting means being mounted near the node of pressure distribution within the duct, and is further provided with a control means for determining the amplitude of flame vibration according to the change of air flowing therethrough, controlling the amount of flowing air when flame vibration is small and controlling the amount of flowing fuel as well as the amount of flowing air when flame vibration increases.
  • the combustion control apparatus is capable of detecting the amount of the air flow stably and further detecting even slight changes of the amount of the flow to achieve highly accurate detection of the changes of the amount of flowing air. Further, the control means determines the amplitude of flame vibration according to the changes of the air flow, controls the amount of the combustion air when flame vibration is small and further controls the amount of flowing fuel when flame vibration increases in order to effectively prevent flame vibration.
  • Fig. 1 is a partial sectional view of the structure of an embodiment of the present invention.
  • Fig. 2 is a front view of a flow meter applied to the embodiment shown in Fig. 1.
  • Fig. 3 is a perspective view of a flow sensor in the flow meter shown in Fig. 2.
  • Fig. 4(a) is a partial sectional view of a hot water supply system for explaining the mounting positions of a gas burner and a flow sensor.
  • Fig. 4(b) is a characteristic view for showing the pressure distribution of combustion air in a duct.
  • Fig. 4(c) is a characteristic view for showing the flow speed distribution of combustion air in the duct.
  • Fig. 1 is a partial sectional view for showing the structure of an embodiment of the present invention.
  • reference numeral 1 denotes a duct having a fan motor 2 which is provided on an end of the duct 1.
  • the fan motor 2 comprises a fan which rotates at a predetermined rotation speed. External air is sucked by the fan and fed into the duct 1.
  • the air outlet of the fan motor 2 is provided with a dumper 3 for adjusting the amount of combustion air flowing into the duct 1.
  • the dumper 3 is rotated around a shaft 5 by a driving unit 4.
  • the degree of the opening of the dumper 3 is adjusted so that the air fuel ratio (air: fuel) of a gas burner is approximately 1.2. The reason why the air fuel ratio is fixed to 1.2 is that combustion under this ratio is most excellent.
  • a gas burner 6 is provided in the downstream of the duct 1.
  • the gas burner 6 is supplied with a predetermined amount of gas (city gas, propane gas) from outside the duct.
  • propane gas is used as fuel gas
  • the gas is supplied from a gas cylinder 7.
  • a heat exchanger 8 is provided downward of the gas burner 6.
  • the heat exchanger 8 comprises cooling pipes of copper and fins connecting them. Water supplied from an end of the cooling pipe passes through the cooling pipe and then is discharged from the other end. The other end of the duct 1 discharges combustion gas passing through the duct 1, as an exhaust port.
  • a flow sensor 9a is mounted in the center of the fan motor 2 and a flow sensor 9b is mounted adjacent to the gas burner 6, upward of the gas burner 6.
  • the flow sensors 9a, 9b detect the amount of combustion air flowing through the duct 1 and supply a flow signal FS corresponding to the amount of passing air to a control circuit 10.
  • thermal type flow sensors are used as the flow sensors 9a, 9b.
  • only one flow sensor 9 is depicted to facilitate understanding of the following description.
  • Fig. 2 is a front view showing the structure of the thermal type flow sensor.
  • the thermal type flow sensor comprises two cylinders 21, 22 mounted in parallel to each other so that they are perpendicular to the direction of air flowing through the duct 1, a portion in which the ends of the cylinders protruding outside the duct 1 are connected to a through hole 25 of the sensor body 24 by means of tubes 26, 27 and a flow sensor portion 28 provided within the through hole 25.
  • Fig. 3 shows the structure of the flow sensor portion 28.
  • Fig. 3 is a perspective view showing the flow sensor portion 28 of the thermal type flow sensor.
  • the flow sensor portion 28 has a diaphragm 32 less than 20 ⁇ m in thickness on a semiconductor chip 31 which is 1.7 mm square and further a micro flow sensor placed on the diaphragm, the micro flow sensor containing an exothermic resisting pattern and a heat sensitive resisting pattern.
  • the exothermic resisting pattern becomes to be exothermic.
  • the resistance of the heat sensitive resisting pattern is set to a certain constant value. Combustion air flowing through the duct 1 enters one cylinder 21 through a hole 21a, passes through the tube 26, the through hole 25, and the tube 27, and finally goes out from a hole 22a of the other cylinder 22. At this time, heat on the semiconductor chip changes depending on the amount of air flowing over the micro flow sensor. Consequently, the resistance of the heat sensitive pattern changes. The change of the resistance is detected by the control circuit 10.
  • the flow sensor portion 28 is constructed with a very small structure, the flow sensor has a very high sensitivity and an excellent responsibility (several meters sec), so that it is always capable of measuring the amount of flow accurately. It is permissible to provide the internal surfaces of the cylinders 21, 22 of the micro flow sensor with minute unevenness in order to collect dust contained in combustion air. Or it is permissible to provide the internal surfaces of the cylinders 21, 22 of the micro flow sensor with a trap, a partition plate coated with adhesive or porous agent or a dust catching plate.
  • the control circuit 10 measures the change of the resistance of the heat sensitive resisting pattern.
  • the change of the resistance of the heat sensitive resisting pattern corresponds to the change of the flow amount of combustion air.
  • the control circuit 10 determines that flame vibration occurs and transmits control signals S1, S2.
  • the control signal S1 is supplied to the driving unit 4 and the control signal S2 is supplied to a gas flow adjusting valve 11.
  • the driving unit 4 drives the dumper 3 according to the control signal S1 and adjusts the degree of the opening in order to control the flow amount of combustion air flowing through the duct 1. Or it is permissible to control the flow amount of combustion air flowing through the duct 1 by changing the rotation speed of the fan motor 2.
  • the adjusting valve 11 controls the flow amount of gas supplied to the gas burner 6 according to the control signal S2.
  • Figs. 4(a), 4(b), 4(c) are figures for explaining the method for determining the mounting positions of the gas burner and the flow sensor.
  • Fig. 4(a) is a partial sectional view of the same hot water supply system as shown in Fig. 1.
  • Fig. 4(b) is a characteristic diagram for showing the pressure distribution of combustion air in the duct
  • Fig. 4(c) is a characteristic diagram for showing the flow speed distribution of combustion air within the duct.
  • the flow sensors 9a, 9b are mounted in the vicinity of a position in which the amplitude of pressure is minimized or the amplitude of flow speed is maximized. Because the change of pressure is small at this position, it is possible to detect the amount of air flow stably and further it is possible to detect a minute change of air flow. Further, because flame vibration is maximum, it is possible to achieve a high precision detection. Whether or not flame vibration occurs is determined by the change of air flow detected by the flow sensors 9a, 9b, that is, a deflection of the amplitude of pressure or amplitude of flow speed.
  • the control circuit 10 drives the driving unit 4 by the control signal S1 depending on the change of flow in order to adjust the degree of the opening of the dumper 3 or the rotation speed of the fan. As a result, the air fuel ratio of the gas burner 6 is changed, so that the combustion condition changes, thereby suppressing flame vibration. If flame vibration increases to produce noise, the change of the flow amount thereof detected by the flow sensors 9a, 9b increases.
  • the control circuit 10 outputs the control signal S2 corresponding to the change of the flow amount as well as the control signal S1.
  • the adjusting valve 11 is driven so as to adjust the amount of the flow of gas.
  • the amount of the flow amount of gas is controlled by means of the adjusting valve as well as the degree of the opening of the dumper and the rotation speed of the fan. Consequently, the air fuel ratio of the gas burner 6 is changed further, so that the condition of combustion changes, thereby further suppressing flame vibration.
  • the present invention is not restricted to this case but can be applied to burners using other fuel such as kerosene, gas oil and the like.
  • the combustion control apparatus is provided with a detecting means for detecting the amount of the flow of combustion air flowing through the duct, the detecting means being placed in the vicinity of the node of the pressure distribution within the duct and determines the amplitude of flame vibration according to the change of the flow amount.
  • the combustion control apparatus comprises a control means for controlling the amount of fuel as well as controlling the amount of the flow of combustion air when flame vibration increases.
  • this combustion control apparatus is capable of detecting a large flame vibration as well as a small flame vibration, and controlling the condition of combustion depending on the amplitude of flame vibration.
  • the combustion control apparatus of the present invention is capable of preventing flame vibration very effectively.

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)
EP95103639A 1994-03-18 1995-03-14 Verbrennungsregeleinrichtung Expired - Lifetime EP0682210B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP6049004A JP2880398B2 (ja) 1994-03-18 1994-03-18 燃焼制御装置
JP49004/94 1994-03-18

Publications (2)

Publication Number Publication Date
EP0682210A1 true EP0682210A1 (de) 1995-11-15
EP0682210B1 EP0682210B1 (de) 1997-10-29

Family

ID=12819037

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95103639A Expired - Lifetime EP0682210B1 (de) 1994-03-18 1995-03-14 Verbrennungsregeleinrichtung

Country Status (3)

Country Link
EP (1) EP0682210B1 (de)
JP (1) JP2880398B2 (de)
DE (1) DE69500945T2 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1450102A1 (de) * 2003-02-20 2004-08-25 Robert Bosch Gmbh Heizgerät und zugehöriges Betriebsverfahren
EP2829803A1 (de) * 2013-07-25 2015-01-28 Honeywell Technologies Sarl Stabilisierung der Verbrennung eines Gasbrenners mittels Fast-Fourier-Transformation (FFT)
EP2743584A3 (de) * 2012-12-13 2018-01-17 Robert Bosch Gmbh Regeleinrichtung mit einem Schwingungssensor, Verfahren zu deren Betrieb und Heizeinrichtung mit einer solchen Regeleinrichtung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9746176B2 (en) 2014-06-04 2017-08-29 Lochinvar, Llc Modulating burner with venturi damper

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2042221A (en) * 1979-02-16 1980-09-17 Kobe Steel Ltd Automatic control of burner combustion
JPS59191812A (ja) * 1983-04-14 1984-10-31 Nippon Kokan Kk <Nkk> 点火確認装置
EP0349384A1 (de) * 1988-06-22 1990-01-03 Centre National De La Recherche Scientifique (Cnrs) Verfahren und Einrichtung zur aktiven Kontrolle von Verbrennungsinstabilitäten
JPH02103312A (ja) * 1988-10-12 1990-04-16 Nakayama Steel Works Ltd 熱風発生装置
WO1991006809A1 (en) * 1989-10-30 1991-05-16 Honeywell Inc. Microbridge-based combustion control

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2042221A (en) * 1979-02-16 1980-09-17 Kobe Steel Ltd Automatic control of burner combustion
JPS59191812A (ja) * 1983-04-14 1984-10-31 Nippon Kokan Kk <Nkk> 点火確認装置
EP0349384A1 (de) * 1988-06-22 1990-01-03 Centre National De La Recherche Scientifique (Cnrs) Verfahren und Einrichtung zur aktiven Kontrolle von Verbrennungsinstabilitäten
JPH02103312A (ja) * 1988-10-12 1990-04-16 Nakayama Steel Works Ltd 熱風発生装置
WO1991006809A1 (en) * 1989-10-30 1991-05-16 Honeywell Inc. Microbridge-based combustion control

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 009, no. 057 (M - 363) 13 March 1985 (1985-03-13) *
PATENT ABSTRACTS OF JAPAN vol. 014, no. 311 (M - 0994) 4 July 1990 (1990-07-04) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1450102A1 (de) * 2003-02-20 2004-08-25 Robert Bosch Gmbh Heizgerät und zugehöriges Betriebsverfahren
EP2743584A3 (de) * 2012-12-13 2018-01-17 Robert Bosch Gmbh Regeleinrichtung mit einem Schwingungssensor, Verfahren zu deren Betrieb und Heizeinrichtung mit einer solchen Regeleinrichtung
EP2829803A1 (de) * 2013-07-25 2015-01-28 Honeywell Technologies Sarl Stabilisierung der Verbrennung eines Gasbrenners mittels Fast-Fourier-Transformation (FFT)

Also Published As

Publication number Publication date
JPH07260140A (ja) 1995-10-13
DE69500945T2 (de) 1998-04-02
EP0682210B1 (de) 1997-10-29
DE69500945D1 (de) 1997-12-04
JP2880398B2 (ja) 1999-04-05

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