WO2001094846A2 - Electrothermal device for ignition and flame detection in gas burners - Google Patents
Electrothermal device for ignition and flame detection in gas burners Download PDFInfo
- Publication number
- WO2001094846A2 WO2001094846A2 PCT/IB2001/001800 IB0101800W WO0194846A2 WO 2001094846 A2 WO2001094846 A2 WO 2001094846A2 IB 0101800 W IB0101800 W IB 0101800W WO 0194846 A2 WO0194846 A2 WO 0194846A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ignition
- gas
- flame
- metal
- metal elements
- Prior art date
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 19
- 230000003197 catalytic effect Effects 0.000 claims abstract description 7
- 230000000694 effects Effects 0.000 claims abstract description 6
- 229910052751 metal Inorganic materials 0.000 claims description 41
- 239000002184 metal Substances 0.000 claims description 26
- 150000002739 metals Chemical class 0.000 claims description 8
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 238000002485 combustion reaction Methods 0.000 abstract description 2
- 239000004020 conductor Substances 0.000 abstract description 2
- 230000006870 function Effects 0.000 abstract description 2
- 230000005678 Seebeck effect Effects 0.000 abstract 1
- 230000003321 amplification Effects 0.000 abstract 1
- 230000002596 correlated effect Effects 0.000 abstract 1
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 27
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000004913 activation Effects 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 229910000809 Alumel Inorganic materials 0.000 description 1
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000011195 cermet Substances 0.000 description 1
- 229910001179 chromel Inorganic materials 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- -1 methane-based) Chemical compound 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- PXXKQOPKNFECSZ-UHFFFAOYSA-N platinum rhodium Chemical compound [Rh].[Pt] PXXKQOPKNFECSZ-UHFFFAOYSA-N 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- F23D14/725—Protection against flame failure by using flame detection devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
- F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q9/00—Pilot flame igniters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2207/00—Ignition devices associated with burner
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2227/00—Ignition or checking
- F23N2227/38—Electrical resistance ignition
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2227/00—Ignition or checking
- F23N2227/42—Ceramic glow ignition
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/1407—Combustion failure responsive fuel safety cut-off for burners
- Y10T137/1516—Thermo-electric
Definitions
- the present invention concerns an electrothermal device for ignition and flame detection in gas burners .
- the present invention concerns an electrothermal device for ignition and continuous flame detection in burners that operate with natural gas (mainly methane-based) , mains gas, LPG and similar.
- natural gas mainly methane-based
- mains gas mainly methane-based
- thermocouple which automatically stops the gas flow, via a solenoid valve, when it cools down due to the fact that it is no longer heated by the flame.
- the aim of the present invention is to provide a device for ignition and flame detection for gas burners that does not have the disadvantages of the traditional devices described above.
- the subject of the present invention is therefore an electrothermal device for ignition and flame detection in gas burners which comprises a pair of metal elements consisting of different metals, preferably with wire-type structure, welded together, each supported on a rheophore, said metal elements being able to generate thermoelectric voltages and currents when the junction is placed in an environment with temperature different from that of the rheophores and being able to generate heat by Joule effect when the rheophores are connected to an electrical power source.
- the metal elements used to produce the device subject of the present invention generally consist of circular section filaments with diameter between 0.1 and 0.8 mm.
- metal straps can be used with thickness between 0.1 and 0.8 mm and width between 2 and 0.5 mm.
- Said elements are supported on rheophores which are also metal, consisting of stainless steel or alloys such as brass and bronze, resistant to corrosion.
- thermoelectric voltage and current for example voltages above 0.03 volts or currents above 3 mA, when only the junction point is in contact with the gas flame, or generate heat by Joule effect
- pairs of said metals are: platinum, platinum-rhodium, Chromel/Alumel .
- Pairs of metals in which at least one of the metals has catalytic properties for oxidisation of the gas are preferable. These pairs of metals are preferred as they permit lower gas ignition temperatures and longer duration of the materials or self-heating of the metal with consequent possibility of reducing the diameter of the metal elements since, once the surface catalysis temperature has been exceeded, the oxidisation (combustion) increases the temperature of the metal, rapidly enabling it to ignite the whole gaseous current.
- Metal pairs able to generate only Joule effect in which at least one of the metals is coated by a metal with catalytic surface properties for oxidisation of the gas, can also be used.
- the electrothermal device for ignition and flame detection in gas burners can consist of a heating element in which the metal elements are replaced by a ceramic or ceramic-metal element in a solid or hollow cylindrical shape activated with metal powder with catalytic activity for oxidisation of the gas. This solution permits miniaturisation of the part of the present device in contact with the flame (hot spot) .
- the present device comprises (Fig. 1-1) the two rheophores Cl and C2 which support the two metal elements A and B joined at point AB which is in contact with the flame F of the burner not illustrated.
- Figures 1-2 and 1-3 represent alternative forms of embodiment of the present invention in which the wire-type metal elements A and B are replaced by a ceramic or cermet element, either solid Dl or hollow D2.
- Figure 2 shows further alternative forms of embodiment of the present invention.
- one of the rheophores (Cl) has a hollow, basically cylindrical or truncated cylindrical shape while the other rheophore (C2) is represented by a vertical bar coaxial with the first one.
- the metal element A supported on the hollow cylindrical-shaped rheophore has a dome structure containing the junction point AB with the metal element B supported on the coaxial rheophore.
- Figure 2-2 shows an embodiment which is similar but provided with window F in which the metal element A forms a hot joint with the wire made of platinum (or similar catalyst) which is heated by the flame through the window F.
- An appliance for sparking ignition in a gas burner and continuously detecting the presence of the flame functioning with the device subject of the present invention, can operate with a low
- impedance circuit in the order of 10-1000 m ⁇ or with a high impedance circuit, in the order of 0.1-
- the appliance for sparking ignition and detecting the flame illustrated in figure 3, comprises: a. an ignition control unit 1; b. a timer 2; c. a two-level inverter 3 connected to the timer; d. a transformer 4 and a comparator 5, connected to the outputs of the two-level inverter, and respectively connected to the ignition and flame detection device 6 and to a gas cut-off system 7.
- the ignition control unit 1 When the ignition control unit 1 is activated, the timer 2 activates the inverter 3 at the highest level to transfer voltage to the transformer 4 and spark the ignition device (thermoelement) 6 which, simultaneously, is in contact with the gas to be ignited.
- the inverter reduces the level of power sent to the transformer, switching to the control level.
- the flame is ignited and keeps the thermoelement junction AB at the required temperature, therefore producing a thermoelectric current.
- the impedance of the thermoelement is read and compared with a value in memory by means of the comparator 5. If the impedance value measured is the same as or above the one in memory, it means that the flame is ignited. When the impedance value measured drops, it means that the intensity of the thermoelectric current is dropping as a result of reduction in temperature of the thermoelement junction AB, due to extinguishing of the flame.
- the equipment for sparking ignition and detecting the flame comprises: e. an ignition control unit 1; f. a timer 2; g. a switching unit 8 connected to the ignition and flame detection device 6; and h. a comparator 5, connected to a gas cutoff system 7.
- the equipment for sparking ignition and detecting the flame operates as in the previous case except that a switching unit is used instead of the inverter/transformer unit.
- the switching unit 8 detects the electromotive force at the ends of the thermoelement 6, comparing it with the reference value. If the above electromotive force is below the reference value, the comparator activates the gas cut-off system which blocks delivery of the gas .
- the electrothermal device for ignition and flame detection in gas burners subject of the present invention offers the following advantages : no electromagnetic emission (spark ignition systems are impulse radiation sources) ; - virtually immediate flame detection (low response time from thermoelement) ; no electrical shocks in the event of contact with the operator; no noise during ignition; immediate ignition (given the energy available for activation) ; presence of one single element able to perform both ignition and flame control; - possibility of forming the hot spot on a point of the device which cannot come into contact with the operator; central control of several burners by connection to a control unit which also controls gas supply cut-off; possibility of detecting accidental gas leakage permanently and on several burners .
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Combustion (AREA)
- Gas Burners (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2001287998A AU2001287998A1 (en) | 2000-06-09 | 2001-06-08 | Electrothermal device for ignition and flame detection in gas burners |
US10/297,271 US7256344B2 (en) | 2000-06-09 | 2001-06-08 | Electrothermal device for ignition and flame detection in gas burners |
DE60129689T DE60129689T2 (en) | 2000-06-09 | 2001-06-08 | ELECTROTHERMIC DEVICE FOR FLAME IGNITION AND MONITORING OF GAS BURNERS |
PL01359177A PL359177A1 (en) | 2000-06-09 | 2001-06-08 | Electrothermal device for ignition and flame detection in gas burners |
EP01967630A EP1287291B1 (en) | 2000-06-09 | 2001-06-08 | Electrothermal device for ignition and flame detection in gas burners |
HK03106324.1A HK1055620A1 (en) | 2000-06-09 | 2003-09-05 | Electrothermal device for ignition and flame detection in gas burners |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT2000MI001286A IT1319453B1 (en) | 2000-06-09 | 2000-06-09 | ELECTROTHERMIC DEVICE FOR THE IGNITION AND DETECTION OF FLAMES IN GAS BURNERS. |
ITMI2000A001286 | 2000-06-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2001094846A2 true WO2001094846A2 (en) | 2001-12-13 |
WO2001094846A3 WO2001094846A3 (en) | 2002-05-30 |
Family
ID=11445222
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2001/001800 WO2001094846A2 (en) | 2000-06-09 | 2001-06-08 | Electrothermal device for ignition and flame detection in gas burners |
Country Status (11)
Country | Link |
---|---|
US (1) | US7256344B2 (en) |
EP (1) | EP1287291B1 (en) |
AT (1) | ATE368828T1 (en) |
AU (1) | AU2001287998A1 (en) |
DE (1) | DE60129689T2 (en) |
ES (1) | ES2291348T3 (en) |
HK (1) | HK1055620A1 (en) |
IT (1) | IT1319453B1 (en) |
PL (1) | PL359177A1 (en) |
RU (2) | RU2002133230A (en) |
WO (1) | WO2001094846A2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003052320A1 (en) * | 2001-12-18 | 2003-06-26 | Nanogate Technologies Gmbh | Flame monitoring |
JP5322636B2 (en) * | 2006-05-11 | 2013-10-23 | 一般財団法人化学及血清療法研究所 | How to spread influenza virus |
US9410525B2 (en) | 2013-08-07 | 2016-08-09 | Denso International America, Inc. | Valve controlled combustion system |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100565143C (en) * | 2007-01-10 | 2009-12-02 | 中国科学院工程热物理研究所 | Straight line butt welding thermopair and measurement modification method |
US8853518B2 (en) * | 2011-09-09 | 2014-10-07 | Eaton Corporation | System employing a thermoelectric device to power an electronic circuit from heat generated by semiconductor devices, and method of powering a system |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB796874A (en) * | 1954-12-10 | 1958-06-18 | Metropolitan Water Board | Improvements in or relating to electrical measuring apparatus |
US3070645A (en) * | 1961-09-12 | 1962-12-25 | Gulf Research Development Co | Catalyst coated thermocouple elements |
FR2224751A1 (en) * | 1973-04-06 | 1974-10-31 | Italiana Tecnomeccanica Precis | |
US4207053A (en) * | 1978-08-18 | 1980-06-10 | Essex Group, Inc. | Igniter and flame sensor assembly for gas burning appliance |
DE3927413A1 (en) * | 1989-08-19 | 1991-02-21 | Dieter Clement | Oil burner ignition element - has glow element supplied via electric leads fed through oil inlet connection |
US5092938A (en) * | 1984-04-14 | 1992-03-03 | Kabushiki Kaisha Kobe Seiko Sho | Temperature detector for use in high temperature and high pressure furnaces |
US5808233A (en) * | 1996-03-11 | 1998-09-15 | Temple University-Of The Commonwealth System Of Higher Education | Amorphous-crystalline thermocouple and methods of its manufacture |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3430856A (en) * | 1967-04-04 | 1969-03-04 | Pyro Serv Instr Inc | Heat control apparatus |
US3650154A (en) * | 1970-02-25 | 1972-03-21 | Instrulab Inc | Thermocouple input temperature sensing circuitry |
US4203779A (en) * | 1978-11-24 | 1980-05-20 | Honeywell Inc. | Flame detection thermocouple |
JPS62272017A (en) * | 1986-05-21 | 1987-11-26 | Nippon Shiirasu Kk | Ignition and flame detecting device for burner |
-
2000
- 2000-06-09 IT IT2000MI001286A patent/IT1319453B1/en active
-
2001
- 2001-06-08 AT AT01967630T patent/ATE368828T1/en not_active IP Right Cessation
- 2001-06-08 RU RU2002133230/06A patent/RU2002133230A/en not_active Application Discontinuation
- 2001-06-08 AU AU2001287998A patent/AU2001287998A1/en not_active Abandoned
- 2001-06-08 EP EP01967630A patent/EP1287291B1/en not_active Expired - Lifetime
- 2001-06-08 WO PCT/IB2001/001800 patent/WO2001094846A2/en active IP Right Grant
- 2001-06-08 US US10/297,271 patent/US7256344B2/en not_active Expired - Fee Related
- 2001-06-08 PL PL01359177A patent/PL359177A1/en not_active IP Right Cessation
- 2001-06-08 ES ES01967630T patent/ES2291348T3/en not_active Expired - Lifetime
- 2001-06-08 DE DE60129689T patent/DE60129689T2/en not_active Expired - Lifetime
-
2003
- 2003-09-05 HK HK03106324.1A patent/HK1055620A1/en unknown
-
2005
- 2005-12-05 RU RU2005138384/06A patent/RU2395038C2/en not_active IP Right Cessation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB796874A (en) * | 1954-12-10 | 1958-06-18 | Metropolitan Water Board | Improvements in or relating to electrical measuring apparatus |
US3070645A (en) * | 1961-09-12 | 1962-12-25 | Gulf Research Development Co | Catalyst coated thermocouple elements |
FR2224751A1 (en) * | 1973-04-06 | 1974-10-31 | Italiana Tecnomeccanica Precis | |
US4207053A (en) * | 1978-08-18 | 1980-06-10 | Essex Group, Inc. | Igniter and flame sensor assembly for gas burning appliance |
US5092938A (en) * | 1984-04-14 | 1992-03-03 | Kabushiki Kaisha Kobe Seiko Sho | Temperature detector for use in high temperature and high pressure furnaces |
DE3927413A1 (en) * | 1989-08-19 | 1991-02-21 | Dieter Clement | Oil burner ignition element - has glow element supplied via electric leads fed through oil inlet connection |
US5808233A (en) * | 1996-03-11 | 1998-09-15 | Temple University-Of The Commonwealth System Of Higher Education | Amorphous-crystalline thermocouple and methods of its manufacture |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003052320A1 (en) * | 2001-12-18 | 2003-06-26 | Nanogate Technologies Gmbh | Flame monitoring |
JP5322636B2 (en) * | 2006-05-11 | 2013-10-23 | 一般財団法人化学及血清療法研究所 | How to spread influenza virus |
US9410525B2 (en) | 2013-08-07 | 2016-08-09 | Denso International America, Inc. | Valve controlled combustion system |
Also Published As
Publication number | Publication date |
---|---|
EP1287291B1 (en) | 2007-08-01 |
HK1055620A1 (en) | 2004-01-16 |
DE60129689D1 (en) | 2007-09-13 |
IT1319453B1 (en) | 2003-10-10 |
RU2395038C2 (en) | 2010-07-20 |
WO2001094846A3 (en) | 2002-05-30 |
US20030136439A1 (en) | 2003-07-24 |
AU2001287998A1 (en) | 2001-12-17 |
RU2005138384A (en) | 2007-06-20 |
ES2291348T3 (en) | 2008-03-01 |
EP1287291A2 (en) | 2003-03-05 |
ITMI20001286A1 (en) | 2001-12-09 |
PL359177A1 (en) | 2004-08-23 |
ITMI20001286A0 (en) | 2000-06-09 |
US7256344B2 (en) | 2007-08-14 |
ATE368828T1 (en) | 2007-08-15 |
DE60129689T2 (en) | 2008-04-30 |
RU2002133230A (en) | 2004-08-10 |
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