EP0527464A1 - Device for checking the combustion quality - Google Patents

Device for checking the combustion quality

Info

Publication number
EP0527464A1
EP0527464A1 EP19920113620 EP92113620A EP0527464A1 EP 0527464 A1 EP0527464 A1 EP 0527464A1 EP 19920113620 EP19920113620 EP 19920113620 EP 92113620 A EP92113620 A EP 92113620A EP 0527464 A1 EP0527464 A1 EP 0527464A1
Authority
EP
Grant status
Application
Patent type
Prior art keywords
flame
tension
resistance
combustion
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.)
Withdrawn
Application number
EP19920113620
Other languages
German (de)
French (fr)
Inventor
Gianluca Ambrosi
Bruno Tagliaferro
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.)
R B L RIELLO BRUCIATORI LEGNAGO SpA
Original Assignee
R B L RIELLO BRUCIATORI LEGNAGO 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

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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

Abstract

The invention discloses a device for the control of the quality of the light of the flame in a combustion system. It comprises an electronic circuit to which a photo resistance is connected. At the terminals (11, 12) of said photo resistance a tension signal is read which, after being suitably treated, feeds an amplifier (7) controlling the lighting up of some leds (8) arranged in a scale, so that the lighting up of the maximum number of leds corresponds with the maximum tension read at the terminals of the photo resistance and vice-versa.

Description

  • [0001]
    The invention concerns a device for checking the combustion quality obtained through the checking of the flame light.
  • [0002]
    The strict relationship between the colour of the flame and the quality of the combustion has been known for quite some time. For instance, the presence of a blue flame in gas combustion guarantees a good combustion, while a white flame indicates that the combustion is not perfect. Thus, also in the combustion of oils, a good combustion is obtained when the flame is completely white, while a yellow flame tending to red shows an imperfect combustion.
  • [0003]
    Repeated observations and tests have led to the conclusion that there is a direct relation between the good quality of the combustion and the low exhaust emission of fumes containing nitric oxides NOx which are highly harmful. For this reason it becomes extremely important to obtain a continuous source of information referring to the quality of the combustion, so as to minimize the emission of harmful fumes. With reference to what has just been said, it has been seen that in the gas combustion the blue flame entails a low emission of fumes of the NOx groups, while, as the flame turns increasingly whiter, the emission of NOx becomes increasingly higher. As for the combustion of oils in the burners, when the flame tends to become yellow-reddish, the NOx-percentage increases. At the present time there is in all burners a photo resistance device checking the presence of the flame. This device is of the ON-OFF type, i.e. it causes the interruption of the fuel inlet into the burner, whenever the flame goes off for any reason. As a consequence, the air inlet into the burner is also interrupted, even with a certain delay. Because of the very nature of its function, the photo resistance ON-OFF device is not able to give off any signal concerning the quality of the flame seen by the photo resistance. In actuality, there is no way of checking whether the combustion occurs in a satisfactory fashion with a low emission of NOx or whether it is necessary to operate a correction of the parameters in the burner.
  • [0004]
    The purpose of the present invention is to overcome the previously described limits and also the inconveniences caused by the impossibility of knowing the quality of the flame and, therefore, the quality of the combustion occurring in the burner.
  • [0005]
    The just mentioned purpose and others which will be better described hereinafter, are reached by a device for the control of the quality of the flame-light, strictly in relation with the combustion quality, in a combustion system which is characterized in that it comprises:
    • an electronic circuit, to which a photo resistance is connected having a resistance which varies in inverse proportion to the intensity of the light hitting said photo resistance, a tension signal being recorded at the terminals of said photo resistance, which, after being suitably treated, feeds a control amplifier causing some leds arranged in a scale to light up, so that the maximum lighting of the leds corresponds with the maximum tension surveyed at the terminals of the photo resistance and vice-versa.
  • [0006]
    Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific example, while indicating a preferred embodiment of the electronic circuit constituting the device, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description and from the drawings, wherein:
    • Fig. 1 represents a block diagram of the device according to the invention;
    • Fig. 2 represents in a diagram the development of the NOx emission in relation to the light (LUX) of the flame.
  • [0007]
    With reference to Fig. 1 it will be observed that the electronic circuit is supplied between the terminals A and B by a stabilized direct-current network tension. Said stabilized tension, which in the example given is of about 15 Volts, supplies the terminals 12 and 11 of the circuit, between which are inserted the photo resistance 2 and the tension adapter 3. The tension adapter 3 is necessary, since it is important and basic that there be at the terminals 12 and 11 an insured pre-set tension, in relation with a light source of a known intensity. Since the photo resistances have a certain degree of variability, through the tension adapter 3, which presents an adjustable resistance 4, it is possible to obtain the desired tension, when the photo resistance 2 is hit by a known source. During lab tests it has been seen that, for instance, with a source of 3 lux it is possible to intercept a tension signal corresponding to 1 Volt between the terminals 12 and 11. Since, as is well known, photoresistances are electrical elements such that the resistance varies in relation with the quantity of light hitting said photoresistances, when the photo resistance intercepts complete darkness, the maximum resistance is reached, which means an open circuit between the terminals 11 and 12. If, on the other hand, the photo resistance is hit by light, the inherent resistance becomes lower, so that there is a passage of current between the terminals 11 and 12 and thus the tension between said terminals becomes lower. In other words, in the presence of complete darkness the maximum tension will be present between the terminals 11 and 12, while the tension will decrease as the light increases. This tension variation is intercepted by the terminals 13 and 14 of a section 5 of the electronic circuit operating as a filter, a limiting device and a delaying device. The filtering function concerns the filtering of the disturbance tensions induced by the transformer of the burner. The tension limiting function is just as important in order to avoid induced excess voltage and the delaying circuit is also necessary in order for the electronic device to read the intensity of the flame without being interfered with by the flame pulsations which inevitably occur during the normal working cycle of the burner. At the limiting outlet of the filter, limiting device and delaying device, indicated as a whole with 5, a signal 15 is let out, which is sent to the comparing circuit 6 which amplifies the tension interval let out of section 5 of the electronic circuit and sends it to the amplifier 7 supplying the leds, which are indicated with 8. It is easy to understand that when the tension is at its maximum between the terminals 11 and 12 of the photo resistance 2, which corresponds practically with darkness and, therefore, with the best combustion conditions, since the flame is blue, the maximum tension supplying the leds 8 also is let out of amplifier 7. In this case, then, all the leds are lit up and reach their utmost luminosity. As the tension increasingly decreases, which means that the luminosity of the flame increases, and as a consequence the combustion worsens, the intensity of the tension let out by amplifier 7 is also decreased and the leds 8 go increasingly off.
  • [0008]
    Through the leds 8 it is then possible to check the quality of the combustion , since, when all the leds are lit up the flame is at its best, since its luminosity is low, while as the leds go increasingly off, the luminosity of the flame increases and this indicates bad combustion.
  • [0009]
    In Fig. 2 it can be observed that the development of the NOx-emission is practically linear in relation with the flame luminosity.
  • [0010]
    The quantity of NOx present in the exhaust fumes is recorded in the abscissae and the lux of the burner flame are recorded in the ordinates.
  • [0011]
    Obviously, it will be observed that with a low flame luminosity there is a low emission of NOx and that the NOx quantity increases in relation to the luminosity of the flame itself. Therefore, the purpose of the invention which proposed to obtain a device for visualizing the quality of the combustion in relation with the luminosity of the flame has been reached, the quality of the combustion and the luminosity of the flame being in inverse relationship.

Claims (2)

  1. A device for checking the quality of the flame-light in a combustion system characterized in that it comprises:
    - an electronic circuit, to which a photo resistance is connected having a resistance which varies in inverse proportion to the intensity of the light hitting said photo resistance, a tension signal being read at the terminals (11, 12) of said photo resistance, which feeds a control amplifier (7) causing some leds (8) arranged in a scale to light up, such that the maximum lighting of the leds corresponds with the maximum tension surveyed at the terminals of the photo resistance and vice-versa
  2. A device according to claim 1, characterized in that the tension signal which is read at the terminals of the photo resistance, is treated with an electronic circuit (5) comprising filters for the elimination of disturbance frequencies, a tension limiting device and a delaying device in order to minimize the effects of the flame pulsations during the normal working cycle.
EP19920113620 1991-08-12 1992-08-10 Device for checking the combustion quality Withdrawn EP0527464A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ITVI910134 1991-08-12
ITVI910134 1991-08-12

Publications (1)

Publication Number Publication Date
EP0527464A1 true true EP0527464A1 (en) 1993-02-17

Family

ID=11424725

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920113620 Withdrawn EP0527464A1 (en) 1991-08-12 1992-08-10 Device for checking the combustion quality

Country Status (1)

Country Link
EP (1) EP0527464A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2553597C2 (en) * 2013-10-18 2015-06-20 Федеральное государственное казенное военное образовательное учреждение высшего профессионального образования Военная академия Ракетных войск стратегического назначения имени Петра Великого МО РФ Method of determination of modes of ignition and burning of explosive filling of ammunition at utilisation by burning out

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB962800A (en) * 1959-11-05 1964-07-01 Babcock & Wilcox Ltd Improvements in flame monitoring apparatus
US3613062A (en) * 1968-02-22 1971-10-12 Memco Ltd Flame quality and presence monitor for multiburner furnaces
DE3224500A1 (en) * 1982-07-01 1984-01-05 Klaus Rothenburg Device for monitoring the combustion behaviour of a combustion appliance
US4882573A (en) * 1988-03-25 1989-11-21 Pullman Canada Ltd. Apparatus and method for detecting the presence of a burner flame

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB962800A (en) * 1959-11-05 1964-07-01 Babcock & Wilcox Ltd Improvements in flame monitoring apparatus
US3613062A (en) * 1968-02-22 1971-10-12 Memco Ltd Flame quality and presence monitor for multiburner furnaces
DE3224500A1 (en) * 1982-07-01 1984-01-05 Klaus Rothenburg Device for monitoring the combustion behaviour of a combustion appliance
US4882573A (en) * 1988-03-25 1989-11-21 Pullman Canada Ltd. Apparatus and method for detecting the presence of a burner flame

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2553597C2 (en) * 2013-10-18 2015-06-20 Федеральное государственное казенное военное образовательное учреждение высшего профессионального образования Военная академия Ракетных войск стратегического назначения имени Петра Великого МО РФ Method of determination of modes of ignition and burning of explosive filling of ammunition at utilisation by burning out

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Legal Events

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Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE

17P Request for examination filed

Effective date: 19930812

17Q First examination report

Effective date: 19950217

18W Withdrawn

Withdrawal date: 19950622