GB1214521A - Improvements relating to multi-burner furnaces - Google Patents

Improvements relating to multi-burner furnaces

Info

Publication number
GB1214521A
GB1214521A GB863468A GB863468A GB1214521A GB 1214521 A GB1214521 A GB 1214521A GB 863468 A GB863468 A GB 863468A GB 863468 A GB863468 A GB 863468A GB 1214521 A GB1214521 A GB 1214521A
Authority
GB
Grant status
Application
Patent type
Prior art keywords
transistor
flame
circuit
element
photo
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
Application number
GB863468A
Inventor
John Anthony Bloice
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.)
MEMCO ELECTRONICS Ltd
Original Assignee
MEMCO ELECTRONICS Ltd
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

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N5/00Systems for controlling combustion
    • F23N5/02Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/08Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements
    • F23N5/082Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements using electronic means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N2029/00Flame sensors
    • F23N2029/06Flame sensors with periodical shutters; Modulation signals

Abstract

1,214,521. Controlling burners. MEMCO (ELECTRONICS) Ltd. 23 Jan., 1969 [22 Feb., 1968], No. 8634/68. Heading F4T. [Also in Divisions G1 and H3] Photoelectric apparatus is designed to monitor a burner flame, which is located near to the flames of other burners, and includes a lightsensitive element, viewing the root of the flame of interest, and connected in a circuit which detects the quantity of relatively high pulsation frequencies (> 1000 c.p.s.) in the element output signal. This avoids for example, the difficulties arising when monitoring one of two opposed flames which was previously done by investigation of the flicker of flame front (at about 100 c.p.s.). The light-sensitive element used may be a photo-cell, photo-resistor or, as in the arrangement of Fig. 2, a photo-transistor. In each case the load for the detector element is a seriesconnected forward biased silicon diode 27 having a logarithmic impedance characteristic substantially matched with the characteristic of the element. In Fig. 2, the output of the phototransistor 6 is fed through coupling capacitor 28 to a limiting amplifier 32, which by means of a feedback loop to give it a low-frequency degenerative characteristic, passes only frequencies in a range above 10,000 c.p.s. The output pulses are all of substantially the same amplitude and are differentiated by resistorcapacitor arrangement 40-41 and detected by rectifier 43 to bias transistor 42, connected as an emitter follower, with a voltage dependent on the pulse repetition rate of the relatively highfrequency pulses passed by amplifier 32. A potentiometer 44 is preadjusted to a predetermined setting so that only voltages above the preset value will maintain SCR 51 conducting, this being fed via time-delay circuit 47. Thus if the flame fails, the high-frequency components of the detector signal disappear and the SCR is shut off causing relay 52 to cause operation of alarm 53. The circuit also includes a system indicating if the sighting window, through which the element 6 views the flame, has become obscured. This operates whether the flame is present or not, since the effect is for light incident on the photo-transistor 6 to diminish in intensity so that the current necessary to supply it falls. Normally the photo-transistor is supplied through two circuits 17 and 18, the latter providing a smoothed supply while the former has a 100 c.p.s. ripple. When the supply required falls below a certain value, circuit 17 does not supply current, so that no signal is passed by capacitor 61 into the indicator circuit 60. The latter comprises amplifier transistor 63, rectifier 68 and smoothing circuit 70-71 supplying transistor 73 which controls magnetic indicator 74. In a modification of the latter circuit, in which a quantitative measure of the intensity of light falling on the detector, is indicated, Fig. 3 (not shown), variations in the intensity of light incident on the detector cause amplitude modulation of a 100 c.p.s. signal which is taken across a bias resistor (113) and is amplified by a feedback stabilized transistor (116) before detection and application to a milliammeter (127). The detector may view the flame through an ultra-violet filter.
GB863468A 1968-02-22 1968-02-22 Improvements relating to multi-burner furnaces Expired GB1214521A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB863468A GB1214521A (en) 1968-02-22 1968-02-22 Improvements relating to multi-burner furnaces

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
GB863468A GB1214521A (en) 1968-02-22 1968-02-22 Improvements relating to multi-burner furnaces
CA 42483 CA930446A (en) 1968-02-22 1969-02-10 Multi-burner furnaces
US3613062A US3613062A (en) 1968-02-22 1969-02-10 Flame quality and presence monitor for multiburner furnaces
FR6904504A FR2002416A1 (en) 1968-02-22 1969-02-21
BE728782A BE728782A (en) 1968-02-22 1969-02-21
FI55469A FI50458C (en) 1968-02-22 1969-02-21 Multi-burner furnace control equipment
JP1288469A JPS4829891B1 (en) 1968-02-22 1969-02-21
DE19691909029 DE1909029A1 (en) 1968-02-22 1969-02-22 Flammenueberwachungsvorrichtung for indicating the state of a burner flame in the presence of a plurality of burner flames in a furnace
NL6902862A NL6902862A (en) 1968-02-22 1969-02-24

Publications (1)

Publication Number Publication Date
GB1214521A true true GB1214521A (en) 1970-12-02

Family

ID=9856246

Family Applications (1)

Application Number Title Priority Date Filing Date
GB863468A Expired GB1214521A (en) 1968-02-22 1968-02-22 Improvements relating to multi-burner furnaces

Country Status (9)

Country Link
US (1) US3613062A (en)
JP (1) JPS4829891B1 (en)
BE (1) BE728782A (en)
CA (1) CA930446A (en)
DE (1) DE1909029A1 (en)
FI (1) FI50458C (en)
FR (1) FR2002416A1 (en)
GB (1) GB1214521A (en)
NL (1) NL6902862A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2660829A1 (en) * 1975-03-20 1982-09-16

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1455034A (en) * 1973-03-20 1976-11-10 Electricite De France Flame monitoring apparatus
US3958126A (en) * 1974-11-25 1976-05-18 Electronics Corporation Of America Logic circuitry
US4039844A (en) * 1975-03-20 1977-08-02 Electronics Corporation Of America Flame monitoring system
JPH0316564B2 (en) * 1982-09-03 1991-03-05 Hitachi Ltd
EP0527464A1 (en) * 1991-08-12 1993-02-17 R.B.L. Riello Bruciatori Legnago Spa Device for checking the combustion quality
US5886783A (en) * 1994-03-17 1999-03-23 Shapanus; Vincent F. Apparatus for isolating light signals from adjacent fiber optical strands
US5550629A (en) * 1994-03-17 1996-08-27 A R T Group Inc Method and apparatus for optically monitoring an electrical generator
US5552880A (en) * 1994-03-17 1996-09-03 A R T Group Inc Optical radiation probe
US5513002A (en) * 1994-03-17 1996-04-30 The A.R.T. Group, Inc. Optical corona monitoring system
US5764823A (en) * 1994-03-17 1998-06-09 A R T Group Inc Optical switch for isolating multiple fiber optic strands
US5550631A (en) * 1994-03-17 1996-08-27 A R T Group Inc Insulation doping system for monitoring the condition of electrical insulation
US5617208A (en) * 1995-02-03 1997-04-01 Huntsman Petrochemical Corporation Ignition detection method and device for a reaction vessel
DE19847832C1 (en) * 1998-10-16 1999-11-04 Siemens Ag Optical system operation method for supervision of flame of combustion chamber
EP1054215A1 (en) * 1999-05-17 2000-11-22 Daewoo Electronics Co., Ltd Boiler with combustion control apparatus
CA2421664A1 (en) * 2003-03-11 2004-09-11 International Thermal Investments Ltd. Improved flame sensor and method of using same
US7618254B2 (en) * 2006-02-02 2009-11-17 Aga Ab Method for igniting a burner

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125693A (en) * 1964-03-17 Constant
US2304641A (en) * 1940-05-04 1942-12-08 Brown Instr Co Control apparatus
US2834008A (en) * 1953-04-28 1958-05-06 Petcar Res Corp Flame detector system
US2762034A (en) * 1954-02-12 1956-09-04 Electronics Corp America Fire and explosion detection apparatus
US2911540A (en) * 1955-02-14 1959-11-03 Gen Controls Co Flame detection system
US3156908A (en) * 1961-12-04 1964-11-10 Viking Corp Flame responsive apparatus
US3316409A (en) * 1963-04-17 1967-04-25 Fenwall Inc Radiation sensitive surveillance flame detector with reduced extraneous pickup
US3321634A (en) * 1964-08-17 1967-05-23 Babcock & Wilcox Ltd Photosensitive flame monitoring circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2660829A1 (en) * 1975-03-20 1982-09-16

Also Published As

Publication number Publication date Type
BE728782A (en) 1969-08-01 grant
FI50458C (en) 1976-03-10 grant
CA930446A (en) 1973-07-17 grant
CA930446A1 (en) grant
FR2002416A1 (en) 1969-10-17 application
DE1909029A1 (en) 1970-01-22 application
FI50458B (en) 1975-12-01 application
US3613062A (en) 1971-10-12 grant
NL6902862A (en) 1969-08-26 application
JPS4829891B1 (en) 1973-09-14 grant

Similar Documents

Publication Publication Date Title
US3553428A (en) Apparatus and method for controlling the power supplied to a load
US3553429A (en) Temperature control circuit
US3476945A (en) Flame detector for a multiple fuel-fired furnace
US4361049A (en) Apparatus for calculating cardiac output
US4538063A (en) Photo transducer circuit for setting minimum and maximum current flow between power terminals
US4784643A (en) Detector of air bubbles in a circuit of liquid
US3988725A (en) Detector system
US4249264A (en) Method and system for transmitting signals by fiber optics
US4128760A (en) Ambient light compensating circuit
US4389903A (en) Indicating system for atmospheric pump arrangement
US3020529A (en) Reflected power alarm for a variable power output antenna system
US5539386A (en) Sensor for detecting air/liquid transitions in a transparent tubing
US2956234A (en) Industrial process control apparatus
US2442910A (en) Electronic comparator densitometer
US4529949A (en) Bias control circuit for light-emitting diode having temperature compensation
US4169663A (en) Eye attention monitor
US3976052A (en) Respiration monitor
US4305659A (en) Photometric apparatus and method
US4060715A (en) Linearized bridge circuitry
US4977375A (en) Fan operating status sensing circuit
US3821516A (en) Method and apparatus for sensing and regulating the temperature of a fluid
US4077718A (en) Receiver for optical radar
US3723989A (en) Electronic planter monitor
US4275393A (en) Method and apparatus for sensing pressure
US2045800A (en) Arc length indicator

Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years