KR20110098171A - Flame sensor for buner - Google Patents

Flame sensor for buner Download PDF

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Publication number
KR20110098171A
KR20110098171A KR1020100017635A KR20100017635A KR20110098171A KR 20110098171 A KR20110098171 A KR 20110098171A KR 1020100017635 A KR1020100017635 A KR 1020100017635A KR 20100017635 A KR20100017635 A KR 20100017635A KR 20110098171 A KR20110098171 A KR 20110098171A
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KR
South Korea
Prior art keywords
burner
ultraviolet
flame
sensor
convex lens
Prior art date
Application number
KR1020100017635A
Other languages
Korean (ko)
Other versions
KR101140998B1 (en
Inventor
김구용
이철우
Original Assignee
현대제철 주식회사
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Priority to KR20100017635A priority Critical patent/KR101140998B1/en
Publication of KR20110098171A publication Critical patent/KR20110098171A/en
Application granted granted Critical
Publication of KR101140998B1 publication Critical patent/KR101140998B1/en

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    • 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
    • F23N5/08—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/26—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q9/00—Pilot flame igniters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/02—Details
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/22—Absorbing filters
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/12—Actuation by presence of radiation or particles, e.g. of infrared radiation or of ions

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Control Of Combustion (AREA)
  • Emergency Management (AREA)
  • Optics & Photonics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Business, Economics & Management (AREA)

Abstract

The present invention relates to a flame detector for a burner, the sensing member for sensing the ultraviolet wavelength generated when the burner 10 is ignited, and disposed on one side of the sensing member to detect the ultraviolet wavelength generated when the burner is ignited. It includes a light absorbing member for condensing to the side. The sensing member is an ultraviolet sensor 21, and the light absorbing member is a convex lens 31 having a curved portion 33 on one side thereof.
According to the present invention, since the convex lens 31 having the curved portion 33 is disposed on the ultraviolet sensor 21 to condense the ultraviolet wavelength generated when the burner 10 is ignited, the measurement output of the ultraviolet wavelength is enhanced so that the flame detection efficiency is improved. There is an excellent advantage.

Description

Flame sensor for burner {Flame sensor for buner}

The present invention relates to a flame detector for a burner, and more particularly, to a flame detector for a burner installed in the burner to prevent the explosion to detect the flame.

In general, an annealing furnace of a steelmaking facility is equipped with a client tube which can heat a strip steel sheet by radiant heat.

In the inside of the client tube, a pilot burner which can be combusted by igniting the main burner capable of injecting combustion fuel and the combustion air supplied to the radiant tube and the combustion fuel injected from the main burner. ) Is mounted.

Disclosure of Invention An object of the present invention is to provide a flame detector for a burner with excellent UV detection efficiency of a flame so as to detect ultraviolet wavelength generated by a flame even when installed in a narrow space such as a client tube or a pilot burner. will be.

According to a feature of the present invention for achieving the above object, the present invention is a sensing member for sensing the ultraviolet wavelength generated when the burner ignition, and disposed on one side of the sensing member ultraviolet light generated when the burner ignition It includes a light absorbing member for condensing a wavelength to the sensing member side.

The sensing member is an ultraviolet sensor.

The ultraviolet sensor has a diameter of 3 to 6 mm.

The ultraviolet sensor includes a gas having an operating temperature of less than 120 ℃ inside.

The light absorbing member is a convex lens having a curved portion on one side.

The present invention enhances the measurement output of the ultraviolet wavelength in condensing the ultraviolet wavelength by disposing a convex lens on one side of the ultraviolet sensor. This can provide a flame detector for a burner with excellent flame detection efficiency by applying a small diameter UV sensor even in a narrow space such as a client tube or a pilot burner.

Therefore, there is an effect that it is possible to provide a burner flame detector with improved operation reliability and excellent flame detection efficiency.

1 is a cross-sectional view showing a flame detector is installed on the burner.
Figure 2 is a cross-sectional view showing a state that the ultraviolet sensor is applied to the flame detector.
3 is a cross-sectional view showing a flame detector for a burner according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail.

The flame detector for a burner of the present invention (hereinafter referred to as "flame detector") is a sensing member for sensing the ultraviolet wavelength generated when the burner is ignited, and is disposed on one side of the sensing member to detect the ultraviolet wavelength generated when the burner is ignited. And a light absorbing member for condensing to the member side.

Flame detector 20 is to detect the state of the flame generated from the burner (10). The flame detector 20 is installed in the radiant tube 11 or the pilot burner 13 in a cylindrical pipe shape to detect the state of the flame generated by the burner 10.

For reference, in the present embodiment, a case where the flame detector 20 is installed in the pilot burner 13 will be described as an example.

Combustion of the burner 10 is achieved by a suitable level combination of air and fuel. Combustion can produce smoke or explode if the ratio of air and fuel is not adjusted.

For example, when sufficient air is not supplied to fuel, contaminants such as carbon monoxide may be generated due to incomplete combustion, and combustion may be impossible when the supply of fuel is insufficient compared to air. In particular, combustion is caused by three conditions: fuel, air, and ignition source. If fuel is continuously supplied without ignition, explosion may occur due to rapid combustion.

Therefore, by detecting the ultraviolet wavelength of the flame generated from the burner 10 to detect whether the combination of air and fuel is an appropriate level.

1 and 3, the sensing member is provided at the end A of the flame detector 20 facing the flame. The sensing member is an ultraviolet (UV) sensor 21 for sensing the ultraviolet wavelength generated by the flame.

The ultraviolet sensor 21 includes a light receiving unit 23 and a detection unit 27. The light receiving unit 23 is a surface where ultraviolet light is received, and the detection unit 27 is a portion that converts the received ultraviolet light into an electric signal. The ultraviolet sensor 21 includes an internal gas 29 having an operating temperature of 120 ° C. or less.

The principle of the ultraviolet sensor 21 is that when the ultraviolet rays generated from the flame enter the light receiving portion 23, the internal gas 29 is ionized and discharged, and the photoelectrons pop out from the light receiving portion 23 to be amplified so that a current flows. Shall be.

The ultraviolet sensor 21 employs a diameter of 3 to 6 mm. Since the radiant tube 11 or the pilot burner 13 has a small space, the ultraviolet tube 21 having a small diameter should be used. By the way, the ultraviolet sensor 21 with a small diameter has low flame detection efficiency.

As a result of the measurement, the UV sensor 21 having a small diameter in the range of 3 to 6 mm has a low UV measurement output of 3.1 to 3.8 kW. In addition, when the flame of the burner 10 is higher than 500 ° C., when excessive heat transfer occurs in the internal gas 29 of the ultraviolet sensor 21, the operation efficiency is also lowered.

Therefore, even if the diameter is small so as to be installed in a narrow space, it is important that the ultraviolet detection efficiency generated by the flame is high, and that the operating efficiency of the ultraviolet sensor 21 does not decrease.

To this end, a light absorbing member is provided. The light absorbing member is a convex lens 31 having a curved portion 33 on one side thereof. That is, the flame detector 20 has a structure in which the convex lens 31 is disposed in front of the ultraviolet sensor 21 so as to increase the detection efficiency of the ultraviolet rays generated by the flame.

As shown in FIG. 3, the convex lens 31 serves to increase the UV transmittance of the flame and block heat. The convex lens 31 uses the optical convex lens 31 which withstands high heat of 1000 degrees C or less. In FIG. 3, the part labeled with UV is an ultraviolet wavelength generated from the flame, and the part labeled with Heat represents heat generated from the flame.

The convex lens 31 amplifies the ultraviolet wavelength by condensing the ultraviolet wavelength generated during ignition and condensing on the diode 25. This is because the ultraviolet wavelength is concentrated and the diode 25 detects the ultraviolet wavelength, which makes it possible to more accurately detect the ultraviolet wavelength caused by the flame.

The curved portion 33 of the convex lens 31 may reduce the curvature in order to increase the degree to which the ultraviolet wavelength is focused on the diode.

Although not shown, the side surfaces of the ultraviolet sensor 21 and the convex lens 31 are wrapped to prevent the UV sensor 21 from being scratched or the convex lens 31 is damaged during operation of the burner 10. A protective cover can be placed. The protective cover may be hollow cylindrical.

And, although not shown, the flame detector 20 is a junction box for connecting and combining the signal received from the cable and the cable for transmitting the ultraviolet rays detected by the ultraviolet sensor 21 as an optical signal, and the signal received from the junction box It includes a control unit for detecting the state of the flame by calculating and controlling the fuel supply amount and the air supply amount.

If there is an abnormal operation in the burner 10 or no combustion occurs, the flame detector 20 signals such a situation to the controller and the controller stops fuel or sends a malfunction signal to the burner 10 when an abnormality occurs. Allow safety measures to be taken.

In addition, in the case of the present invention, the diameter of the ultraviolet sensor is limited to 3 to 6mm to implement a configuration capable of enhancing the measurement output of the ultraviolet wavelength even when the diameter of the sensor is narrow. Therefore, the configuration of the present invention is applicable even when the diameter of the ultraviolet sensor is larger than the above range.

Hereinafter, the present invention will be described in detail through experiments.

Experiment 1

Table 1 shows the ultraviolet light output of the flame detector 20 (FIG. 2_ Comparative Example) to which only the ultraviolet sensor is applied, and the flame detector 20 (FIG. 3_ invention example) in which the convex lens is disposed in front of the ultraviolet sensor.

division Combustion conditions Measurement output lower limit
(㎂) Comparative example

Lean combustion Air> fuel 3.1 Theoretical equivalent combustion Air = fuel 3.8 Rich combustion Air <fuel 3.4 Inventive Example

Lean combustion Air> fuel 5.5 (+ 77% power boost) Theoretical equivalent combustion Air = fuel 4.9 (+ 29% power boost) Rich combustion Air <fuel 5.2 (+ 53% power boost)

Lean combustion is the case where the fuel supply is insufficient compared to air, theoretical equivalent combustion is the case where the air and fuel supply ratio are appropriate, and Rich combustion is the case where the air supply is insufficient compared with the fuel.

In addition, numerical values indicated as output enhancement in Inventive Example 1 and Inventive Example 2 are shown in comparison with Comparative Examples.

Referring to Table 1 and FIG. 2, the flame detector 20 using only the ultraviolet sensor is incident on the light receiving unit 23 of the ultraviolet sensor 21 at the same time when the flame is generated in the burner 10. Ultraviolet wavelength is input to a wide range of parallel light so that only a part of it is focused on the diode 25.

According to the experimental results, the lower limit of the measurement output of the ultraviolet wavelength is low, in the range of 3.1 to 3.8 kW.

On the other hand, referring to Table 1 and Figure 3, the flame detector 20 having the convex lens 31 disposed in front of the ultraviolet sensor 21, when the flame occurs in the burner 10, heat is blocked and only the ultraviolet wavelength of the flame The light is collected through the convex lens 31 and is incident on the light receiving units 23 and 23 of the ultraviolet sensor 21.

At this time, the ultraviolet wavelength is collected by the curved portion while passing through the convex lens. Therefore, the range in which the diode detects ultraviolet wavelengths is wider.

Further, the increase in the lower limit of the measurement output of the ultraviolet wavelength also has the effect of blocking the heat of the convex lens 31, which may cause excessive heat transfer to the gas inside the ultraviolet sensor 21.

Through the experimental results, even when the ultraviolet sensor 21 having a diameter of 3 to 6 mm is applied, the convex lens 31 is disposed in front of the ultraviolet sensor 21 to condense the ultraviolet wavelength, thereby enhancing the measurement output of the ultraviolet wavelength. It can be seen that.

It can be seen that precise flame detection is possible even if a small flame detector 20 is applied to a radiant tube 11 or a regenerative burner 10 having a narrow space. Therefore, it is possible to provide a flame detector for a burner having excellent flame detection efficiency even in a narrow space.

Within the scope of the basic technical idea of the present invention, many other modifications are possible to those skilled in the art, and the scope of the present invention should be interpreted based on the appended claims. will be.

10: Burner 11: Radiant Tube
13: Pilot Burner 20: Flame Detector
21: UV sensor 23: light receiving unit
25: diode 27: detection unit
29: internal gas 31: convex lens
33: curved surface

Claims (5)

Sensing member for detecting the ultraviolet wavelength generated when the burner ignition,
And a light absorbing member disposed at one side of the sensing member and focusing the ultraviolet wavelength generated when the burner is ignited to the sensing member. The method according to claim 1,
The sensing member is a flame sensor for a burner, characterized in that the ultraviolet sensor. The method according to claim 2,
The ultraviolet sensor is a flame detector for a burner, characterized in that the diameter of 3 ~ 6mm. The method according to claim 3,
The ultraviolet sensor is a flame sensor for a burner, characterized in that it comprises a gas having an operating temperature of 120 ℃ or less inside. The method according to any one of claims 1 to 4,
The light absorbing member is a flame detector for a burner, characterized in that the convex lens having a curved portion on one side.
KR20100017635A 2010-02-26 2010-02-26 Flame sensor for buner KR101140998B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR20100017635A KR101140998B1 (en) 2010-02-26 2010-02-26 Flame sensor for buner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR20100017635A KR101140998B1 (en) 2010-02-26 2010-02-26 Flame sensor for buner

Publications (2)

Publication Number Publication Date
KR20110098171A true KR20110098171A (en) 2011-09-01
KR101140998B1 KR101140998B1 (en) 2012-05-02

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Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100492189B1 (en) * 2002-09-11 2005-06-02 주식회사 금륜방재산업 Discernment device for far distance fire confirmation
KR101015349B1 (en) * 2008-07-21 2011-02-16 박기태 Explosive-proof ultraviolet flame detector

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