JP3258778B2 - Flame detection and combustion diagnostic device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flame detection and combustion diagnosis apparatus for detecting the presence or absence of a flame in a combustion furnace of a thermal power plant and diagnosing the combustion state.

[0002]

2. Description of the Related Art From the viewpoint of environmental measures, it is desired that combustion devices such as boilers do not generate pollutants such as nitrogen oxides, soot and carbon monoxide. In order to form such a combustion state, a flame in which the fuel and the air are appropriately mixed in the combustion furnace is formed, and thereby, an extremely high temperature region or an extremely low temperature region is not formed in the combustion furnace. It is necessary. As one of the apparatuses for monitoring such a combustion state, there is a combustion diagnosis apparatus that analyzes the spectrum intensity of light emission of a combustion flame and diagnoses the combustion state based on the analysis result. This will be described with reference to FIGS.

FIG. 13 is a block diagram of a conventional combustion diagnostic apparatus, and FIG. 14 is a perspective view of the spectroscopic analyzer shown in FIG.
In FIG. 13, reference numeral 1 denotes a burner, 2 denotes a flame of the burner 1, 3 denotes an optical probe that receives light emitted by the flame 2, 4 denotes a spectral analysis unit that separates light into monochromatic light having different wavelengths, and 5 denotes an optical probe 3. A relay optical fiber for guiding light to the spectroscopic analysis unit 4, a low-pass filter 6, and a data analysis unit 7.

The optical probe 3 has one or more visual fields, is installed near the burner 1 of the combustion furnace, and receives light from the burner flame 2. Light emitted from the burner flame 2 received by the optical probe 3 installed in the combustion furnace is sent to the spectroscopic analyzer 4 via the relay optical fiber 5. As will be described later, the spectroscopic analysis unit 4 splits the transmitted light at predetermined wavelengths in the visible to near-infrared wavelength range, and converts the split light into an electric signal by a photodetector. From this electric signal, a low-pass filter (electrical filter) 6 directs (DC)
C) The signal component is taken out, the emission spectrum intensity analysis is performed by the data analysis unit 7 based on the DC component, and the combustion state is diagnosed based on the analysis result.

[0005] As shown in FIG. 14, the spectroscopic analyzer 4 shown in FIG. 13 comprises a tip 10 of an optical fiber 5 and a photodetector 11.
A disk 13 in which several optical interference filters 12 having different transmission wavelengths are arranged on a concentric circle is rotatably mounted between the optical disk and the optical disk, and the disk 13 is rotated by a motor 14 so that light incident on the photodetector 11 is rotated. Of the flame, the light of each predetermined wavelength of the flame emission is converted into an electric signal by the photodetector 11 and transmitted to the amplifying unit 16 via the cable 15. Input to the filter 6.

On the other hand, in a recent power generation boiler, a point fire extinguishing operation of a burner is frequently performed by an intermediate load operation or a DSS (daily start / stop) operation, and a flame detecting device for detecting the ignition and extinguishing state of a burner flame is provided. It is an important component. Most of the devices generally used as a flame detecting device detect the emission of the flame to determine the presence or absence of the flame. In a multi-burner furnace such as a boiler for power generation, the flame shape changes temporally and spatially due to the influence of adjacent and opposed flames. It is valid. As for the wavelength of light, a visible-near-infrared wavelength region is often used. Such a flame detection device will be described with reference to the drawings.

FIG. 15 is a block diagram of a conventional flame detector. As shown in the figure, this flame detection device uses the optical probe 20 and the relay optical fiber 2 to emit light of the flame 2 of the burner 1.
The light is guided to the photoelectric conversion amplifier 22 by 1, converts light in a predetermined wavelength range into an electric signal, and a bandpass filter (electric filter) 23 extracts a signal of a specific frequency band of the electric signal, and the rectifier 24 specifies the signal. The data is converted into a DC signal corresponding to the signal strength in the frequency band, and the data analysis unit 25 determines the ignition and extinction of the flame based on the magnitude of the DC signal.

[0008]

According to the prior art, when a flame detecting device and a combustion diagnosing device are installed in a combustion furnace, they are separate devices, and a single optical probe and a relay optical fiber are separately provided. Alternatively, the system has a system configuration in which the emission of a flame guided by the same relay optical fiber, received by the same optical probe, is branched by an optical coupler, and the branched light is guided to a flame detector and a combustion diagnostic device.

In the former configuration, there is a problem that a large space is required for mounting around the burner, and the cost of attaching the optical probe and the relay optical fiber is high. Further, in the latter configuration, the amount of light incident on each of the photodetectors of the flame detecting device and the combustion diagnosing device is greatly reduced due to the two branches of light by the optical coupler as compared with a case where the devices are installed alone. There was.

An object of the present invention is to solve the above-mentioned problems in the prior art, and to provide a flame detection and combustion diagnosis apparatus which can use the same optical probe and relay optical fiber and can prevent a decrease in light quantity. To provide.

[0011]

In order to achieve the above object, the present invention comprises an optical probe for receiving light emitted from a flame of a burner, and an optical fiber for extracting the light received by the optical probe to the outside. The light extracted by the optical fiber is split into a plurality of monochromatic lights having different wavelengths.
And the monochromatic light from the spectroscopic section
A plurality of photoelectric conversion units for converting the
Of a predetermined wavelength of the electrical signal converted by the photoelectric conversion unit.
Combustion of the burner based on an electrical signal corresponding to monochromatic light
A combustion diagnosis unit for diagnosing a state and conversion by each of the photoelectric conversion units
Of the electrical signals other than the monochromatic light of the predetermined wavelength
And a flame detector for detecting the presence or absence of a flame of the burner based on an electric signal corresponding to monochromatic light .

[0012]

[0013]

In the present invention, the light of the optical probe is introduced into the light splitting unit and split into a plurality of monochromatic lights having different wavelengths. Minute
Each monochromatic light emitted is introduced into the photoelectric conversion unit, and
It is converted into an electric signal proportional to the amount of light. Each converted power
Among the air signals, the electric signal corresponding to a predetermined wavelength is a combustion diagnosis.
Used for diagnosis of burner flame combustion status
The electric signals corresponding to the wavelengths other than those described above are input to the flame detector and used for determining whether the burner flame is ignited or extinguished.

[0014]

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. FIG. 1 is a block diagram of a flame detection and combustion diagnosis apparatus according to an embodiment of the present invention. In this figure, 1 is a burner,
2 is a flame of the burner 1, 3 is an optical probe, and 5 is a relay optical fiber. Reference numeral 20 denotes a spectroscopic / photoelectric conversion unit that splits the introduced light into different wavelengths and converts each split light into an electric signal proportional to the amount of the light. 40 is a low-pass filter, 50 is a combustion diagnosis unit, 60 is a band-pass filter, and 70 is a flame detection unit.

FIG. 2 is a block diagram showing the configuration of the spectral / photoelectric conversion unit 30 shown in FIG. In this figure, reference numeral 31 denotes a light splitting unit for splitting the light introduced from the relay optical fiber 5 into light having a plurality of different wavelengths. In this embodiment, the light is split into light having six types of wavelengths. Reference numeral 32 denotes six light detection elements to which light of each wavelength split by the light splitting unit 31 is directly irradiated, and outputs an electric signal proportional to the light amount of the irradiated light. The photoelectric conversion unit 33 is configured by these light detection elements. Reference numeral 34 denotes an amplifying unit that amplifies the electric signal converted by each of the photodetectors 32. The amplified electric signal is output to the low-pass filter 40 and the band-pass filter 60.

FIGS. 3 and 4 are diagrams showing specific examples of the spectroscopy unit 31 shown in FIG. In FIG. 3, reference numeral 310 denotes a prism. In FIG. 4, reference numeral 311 denotes a diffraction grating, and the incident light is separated from the normal line 312 for each wavelength. Prism 31
0 or the diffraction grating 311, for example, in the wavelength range of 0.7 to 1.
The light is split at several points from 0 μm and several points from a wavelength range of 1.3 to 1.5 μm. For the former wavelength range, a silicon photodiode is used for the photodetector 32 shown in FIG. 2, and for the latter wavelength range, a germanium photodiode is used.

Next, the operation of this embodiment will be described. The optical probe 3 has one or more visual fields and is attached to or near each burner 1 of the combustion furnace, and receives light from the burner flame 2. The light received by the optical probe 3 is guided to the spectral / photoelectric conversion unit 30 via the relay optical fiber 5. In the spectral / photoelectric conversion unit 30, the light emission of the flame is divided into monochromatic lights having predetermined detection points (six in the illustrated example) by the spectral unit 31, and each monochromatic light is converted into the light amount by the photoelectric conversion unit 33. Convert to the corresponding electric signal. Each electric signal amplified by the photoelectric conversion amplifier 34 has a DC component in the low-pass filter 40,
An AC component of a specific frequency is extracted by the bandpass filter 60. The DC component extracted by the low-pass filter 40 is input to the combustion diagnostic section 50, and the spectrum intensity at a plurality of predetermined detection wavelengths is calculated from each of the AC components, and the combustion state is diagnosed based on the result. At the same time, the AC component of the specific frequency extracted by the band-pass filter 60 is input to the flame detection unit 70, and the specific frequency band, for example, 30 to
The level of the AC component in the 300 Hz band is determined, and the ignition and extinction of the flame are determined.

In order to analyze the alternating current (flickering) component of the emission of the flame, that is, the alternating current component of each output electric signal of each photodetector 32 of the photoelectric conversion unit 33, each output electric signal is generated online. There is a need. For this purpose, a method of spectrally analyzing the light emission of a flame by mechanically switching several optical interference filters 12 having different transmission wavelengths as in the conventional spectral analysis unit shown in FIG. 14 is not suitable. On the other hand, in the present embodiment, the emission of the flame can be spectrally analyzed on-line as shown.

Here, an outline of a diagnosis method of the combustion diagnosis unit 50 and a detection method of the flame detection unit 70 will be described. The combustion diagnosis unit 50 calculates the flame temperature calculated from the emission spectrum intensity in the wavelength range of 0.7 to 1.0 μm in the above-described example in the visible to near-infrared wavelength range of the flame emission, and 1.3. ~
The combustion state is diagnosed based on the amount of water vapor absorbed calculated from the emission spectrum intensity of 1.5 μm. FIG.
FIG. 3 is a diagram showing the emission spectrum intensity of a heavy oil combustion flame.
On the longer wavelength side than 0.7 μm, a continuous spectrum due to soot (carbonaceous particles) in the flame is observed. On this continuous spectrum, a decrease in spectral intensity due to water vapor absorption is observed at around 1.1 μm and 1.4 μm. . The soot has a light emission characteristic close to a black body, and is generally treated as a gray body. The relationship between the wavelength of the gray body and the radiant energy (spectral intensity) is given as a temperature relationship by the following Plank equation. The flame temperature is calculated from the spectrum intensity measurement using this relationship.

M _λ = {ε · C ₁ / λ ⁵ } / ｛exp (C
₂ / λT) -1｝ M _λ ; radiant energy (spectral intensity) at wavelength λ; emissivity λ; wavelength T; absolute temperature C ₁ , C ₂ ; first and second constants in the Plank equation: around 1.4 μm Is decreased by the flow of the exhaust gas containing water vapor between the optical probe 3 and the flame, so that the absorption band of the water vapor (1.4, 1.9, 2.7 μm).
m) only as a result of the absorption of light from the flame. The combustion diagnosis unit 50 diagnoses a combustion state based on a database of a causal relationship between a change in a flame temperature and a light absorption amount of water vapor and a combustion condition. The diagnosis of such a combustion state is described in, for example, Journal of Fuel Association, Vol. 70.
No. 4 P359, 29th Japan Heat Transfer Symposium Lecture Papers (1992-5) P851.

Next, a detection method of the flame detection unit 70 will be described. The flame detecting unit 70 includes a band-pass filter 60.
A specific frequency band, for example, 30
The strength of the signal in the frequency band of ~ 300 Hz is determined. That is, the presence or absence of a flame is determined from the flicker (alternating current) component of light in the visible to near-infrared wavelength region of the flame emission. FIG. 6 is a diagram showing the intensity of the AC component from the flame when the burner is igniting and extinguishing. A is the state of ignition and B is the state of fire extinguishing. The ignition / extinguishing of the flame can be determined by focusing on a specific frequency band in which the presence / absence of a burner flame appears remarkably.

As described above, according to the present embodiment, since the optical branching is not performed, there is no significant decrease in the amount of light, and the flame detecting function and the combustion diagnosing function are performed using the same optical probe and the relay optical fiber. The effect which can comprise the apparatus provided with this is acquired.

FIG. 7 is a block diagram of a spectral / photoelectric converter of a flame detection and combustion diagnosis apparatus according to another embodiment of the present invention. This embodiment is different from the previous embodiment only in the configuration of the spectral / photoelectric conversion unit 30, and the other configuration is the same as the previous configuration. 7, the same parts as those shown in FIG. 2 are denoted by the same reference numerals. 35 is an optical fiber. In the present embodiment, the respective photodetectors 32 are arranged via the respective optical fibers 35, whereas the respective photodetectors 32 in the previous embodiment are arranged at the arrival positions of the respective beams split by the spectroscope 31.

In this embodiment, by using an optical fiber, it is not necessary to use the photoelectric conversion unit 33 in which the respective photodetectors are accurately arranged as in the previous embodiment, and a single photodetector 32 is used. And the cost of the apparatus can be reduced. Other effects are the same as those of the previous embodiment.

FIG. 8 is a block diagram of a spectral / photoelectric converter of a flame detection and combustion diagnosis apparatus according to still another embodiment of the present invention. This embodiment is different from the embodiment shown in FIG. 1 in that the configuration of the spectral / photoelectric conversion unit 30 and that the electric signals to the low-pass filter 40 and the band-pass filter 60 are divided are shown in FIG. The configuration is the same as that of the embodiment shown. 8, the same parts as those shown in FIG. 1 are denoted by the same reference numerals. Reference numeral 301 denotes a spectral / photoelectric conversion unit according to this embodiment.

FIG. 9 is a diagram showing a configuration of the photoelectric conversion section 301 shown in FIG. In this figure, 5 is a relay optical fiber, 3
11 is a collimator lens, 312a to 312g are multilayer interference filters, 313a to 313d are silicon photodiodes, 313e to 313g are germanium photodiodes, 313h is a lead sulfide (PbS) photoconductive element,
314 is a glass block for accommodating each of the multilayer interference filters 312a to 312g.

Next, the operation of this embodiment will be described. The emission of the flame, which has been made into a parallel light beam by the collimator lens 311 via the optical fiber 5, is emitted by the multilayer interference filters 312a to 312.
The light enters the glass block 314 containing 2 g. Each multilayer interference filter deteriorates over time due to the surrounding atmosphere (gas, moisture) and the like, so that the transmittance, the reflectance, and the like decrease.
To prevent this, each multilayer interference filter is covered with a glass block 314 to reduce the effects of aging. The light incident on the multilayer interference filter 312a is light in a wavelength range of 0.4 to 1.6 μm due to the wavelength transmission characteristics of the optical fiber 5. The multilayer interference filter 312a has a thickness of 0.4 to 1.1 μm.
, And reflects light in other wavelength ranges.

The light in the wavelength range of 0.4 to 1.1 μm transmitted through the multilayer interference filter 312a first enters the multilayer interference filter 312b. FIG. 10 is a spectrum characteristic diagram of the multilayer interference filter 312b. As shown, the multilayer interference filter 312b transmits only light in a narrow wavelength band centered on a wavelength of 0.8 μm, and the transmitted light is converted into an electric signal by a silicon photodiode 313a.
This electric signal is input to the low-pass filter 40. Light in other wavelength ranges in the multilayer interference filter 312b is reflected and enters the multilayer interference filter 312c.
The multilayer interference filter 312c transmits only light in a narrow wavelength band centered on a wavelength of 0.9 μm, and the transmitted light is converted into an electric signal by the silicon photodiode 313b and input to the low-pass filter 40. Light in other wavelength ranges in the multilayer interference filter 312c is reflected and enters the multilayer interference filter 312d.

The multilayer interference filter 312d has a wavelength of 1.0
Only light in a narrow wavelength band centered on μm is transmitted, and the transmitted light is similarly converted into an electric signal by the silicon photodiode 313 c and input to the low-pass filter 40.
Light in the other wavelength range in the multilayer interference filter 312d is reflected and incident on the silicon photodiode 313d, converted into an electric signal, and input to the bandpass filter 60. The light incident on the silicon photodiode 313d has a wavelength of 0.1 mm transmitted through the multilayer interference filter 312a.
Of the light in the sensitivity wavelength range of the silicon photodiode of 4 to 1.1 μm, wavelengths of 0.8, 0.9, and 1.0 μm, respectively.
This is light in a wavelength range excluding light in a narrow wavelength band around m. Flame detection is performed from the signal intensity of a specific frequency band of the output electric signal of the silicon photodiode 313d, for example, a frequency band of 30 to 300 Hz. That is, as described above, the emission spectrum of a flame in the visible to near-infrared region is mainly a continuous spectrum due to the emission (solid emission) of solid particles (such as soot) in the flame. Since the light in the visible to near-infrared region is light from the same light source, the frequency characteristics of the electric signal converted by the photodetector have the same characteristics regardless of the wavelength.
Therefore, even if light in a wavelength range excluding light in a narrow wavelength band centered on 0.8, 0.9, and 1.0 μm is used as an input for flame detection, the flame using the relationship shown in FIG. It is possible to determine the presence or absence of a flame based on the detection principle.

The light reflected by the multilayer interference filter 312a is similarly transmitted to the multilayer interference filters 312e and 312.
f, 312 g, wavelength 1.3, 1.4, 1.5 μm
Only the light in the narrow wavelength band centered on each is transmitted,
Germanium photodiodes 313e, 313f, 3
The signal is converted into an electric signal by 13g. These electric signals are input to the low-pass filter 40. Light in other wavelength ranges enters the lead sulfide photoconductive element 313h and is converted into an electric signal. The signal intensity of this electric signal in a specific frequency band is input to the band-pass filter 60 in the same manner as the signal of the silicon photodiode 313d. And used for flame detection. The light incident on the lead sulfide photoconductive element 313h is 0.4 to 1.1 μm out of the emission of the flame and the wavelength is 1.3, 1..
This is light in a wavelength range excluding light in a narrow wavelength band having a center wavelength of 4, 1.5 μm. FIG. 11 is a characteristic diagram of the spectral sensitivity of the silicon photodiode and the lead sulfide photoconductive element. C indicates the characteristic of the silicon photodiode, and D indicates the characteristic of the lead sulfide photoconductive element.

In the description of the above embodiment, a silicon photodiode, a germanium photodiode, and a lead sulfide photoconductive element are used as photodetectors. However, a lead sulfide photoconductive element is used instead of a germanium photodiode. Alternatively, a germanium photodiode may be used instead of the lead sulfide photoconductive element. Also,
Instead of a germanium photodiode and a lead sulfide photoconductive element, a lead selenide (PbSe) photoconductive element may be used.

Further, the spectral / photoelectric conversion unit 3 of the above embodiment
In FIG. 1, the light transmitted by one optical fiber has been described as being configured to be split into monochromatic light having a predetermined number of wavelengths and light in other wavelength ranges. 5, a plurality of silicon photodiodes 313a to 313d, germanium photodiodes 313e to 313g, and a lead sulfide photoconductive element 313h are arranged in the depth direction corresponding to the number of optical fibers, and a multilayer film interference filter 312a The size of the flame transmitted by the plurality of optical fibers is set to a predetermined number by setting the size in the depth direction toward the paper surface of 〜312 g to a size capable of receiving or transmitting or reflecting the light transmitted by the plurality of optical fibers. The light can be separated into monochromatic light having a wavelength at a point and light in other wavelength ranges and photoelectrically converted. This configuration is shown in FIG.

That is, the optical probe installed in each burner of the combustion furnace has one or more visual fields, and three visual fields are often used. The relay optical fiber is composed of three optical fibers when transmitting the light emission of the flame from the three visual fields. FIG.
In 2, the light emitted from the flame in three fields of view is guided by the three optical fibers 5 to the collimator lens 311, converted into three parallel light beams, and incident on the glass block 314. 3
The light beams enter the multilayer interference filter 312a, and thereafter, for each of the three light beams, as in FIG. 9, the monochromatic light having a predetermined number of wavelengths and the other monochromatic light beams for the other wavelength regions are output by the multilayer interference filters 312a to 312g. Dispersed into light.

In FIG. 12, an optical fiber 315 is used to correct the aging of the multilayer interference filters 312a to 312g and the like. The light from a standard white light source (tungsten lamp) is guided to the spectroscopic section, and this light is measured. In the same manner as the light of the optical fiber 5 for conversion, and is converted into an electric signal by a photodetector for correction. Although only the correction photodetector 316 is shown in FIG. 12, a silicon photodiode, a germanium photodiode, and a lead sulfide photoconductive element are arranged at the emission positions of the separated light, as in the measurement. Aging deterioration of the multilayer interference filter is determined from the aging of these correction photodetector output signals, and the measured value is corrected. Although the optical fibers are arranged in only one direction in FIG. 12, they may be arranged two-dimensionally in the vertical and horizontal directions.

The effect of this embodiment is the same as that of the embodiment shown in FIG. Further, with the configuration as shown in FIG. 12, a plurality of optical fibers can be arranged and the light can be separated by the same optical system using the same multilayer interference filter. In addition, the optical fiber for correction is similarly arranged, and the aging of the optical performance of the multilayer interference filter can be measured and corrected using standard white light. It should be noted that the configuration shown in FIGS. 9 and 12 can be used for the spectral / photoelectric conversion unit shown in FIG.

[0037]

As described above, according to the present invention, the light of the flame guided by the optical fiber is transmitted to a plurality of units having different wavelengths.
A spectroscopic unit that splits the light into color light, and each monochromatic light from this spectroscopic unit.
A plurality of photoelectric conversion units that convert the electric signal according to the light amount
And of the electric signals converted by these photoelectric conversion units
Based on an electrical signal corresponding to monochromatic light of a predetermined wavelength,
A combustion diagnostic section for diagnosing the combustion state of the burner;
Of the predetermined wavelength of the electric signal converted by the conversion unit.
Based on an electrical signal corresponding to monochromatic light other than monochromatic light
A flame detector that detects the presence of a burner flame
It is characterized by the following. Therefore, flame detection and combustion diagnosis can be performed without causing a significant decrease in the amount of light and using the same optical probe and relay optical fiber.

[Brief description of the drawings]

FIG. 1 is a block diagram of a flame detection and combustion diagnosis apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of a spectral / photoelectric conversion unit illustrated in FIG. 1;

FIG. 3 is a diagram illustrating a configuration of a spectroscopy unit illustrated in FIG. 2;

FIG. 4 is a diagram illustrating a configuration of a spectroscopy unit illustrated in FIG. 2;

FIG. 5 is a spectrum characteristic diagram illustrating a diagnosis method of a combustion diagnosis unit.

FIG. 6 is an optical signal intensity characteristic diagram illustrating a detection method of a flame detection unit.

FIG. 7 is a diagram illustrating a configuration of a spectral / photoelectric conversion unit of a flame detection and combustion diagnosis apparatus according to another embodiment of the present invention.

FIG. 8 is a block diagram of a flame detection and combustion diagnosis apparatus according to still another embodiment of the present invention.

FIG. 9 is a diagram illustrating a configuration of a spectral / photoelectric conversion unit illustrated in FIG. 8;

FIG. 10 is a spectrum characteristic diagram of the multilayer interference filter shown in FIG. 9;

11 is a spectral sensitivity characteristic diagram of the photoelectric conversion element shown in FIG.

12 is a top view of the spectral / photoelectric conversion unit shown in FIG. 9 in a case of a multi-view.

FIG. 13 is a block diagram of a conventional combustion state diagnostic apparatus.

FIG. 14 is a perspective view of the spectroscopic analyzer shown in FIG.

FIG. 15 is a block diagram of a conventional flame detection device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Burner 2 Flame 3 Optical probe 5 Relay optical fiber 30 Spectroscopic / photoelectric conversion part 40 Low-pass filter 50 Combustion diagnostic part 60 Band-pass filter 70 Flame detection part

Continuation of the front page (72) Inventor Kiichiro Honda 6-9 Takara-cho, Kure City, Hiroshima Prefecture Inside the Kure Plant of Babkotsuk Hitachi Ltd. (56) References JP-A-61-138022 (JP, A) JP-A-5-79624 (JP, A) JP-A-62-134418 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23N 5/08 G01J 3/443 G01N 21/27

Claims (6)

(57) [Claims] 1. An apparatus comprising: an optical probe for receiving light emitted by a flame of a burner; and an optical fiber for extracting the light received by the optical probe to the outside, wherein the light extracted by the optical fiber has a different wavelength. A spectroscopic unit that splits the light into a plurality of monochromatic lights, a plurality of photoelectric conversion units that convert each monochromatic light from the spectroscopic light into an electric signal corresponding to the amount of light, and an electric signal that is converted by each of the photoelectric conversion units. A combustion diagnostic unit for diagnosing the combustion state of the burner based on an electric signal corresponding to the monochromatic light having a predetermined wavelength, and the electric signals converted by the photoelectric conversion units other than the monochromatic light having the predetermined wavelength. A flame detection unit for detecting the presence or absence of flame of the burner based on an electric signal corresponding to the monochromatic light. Wherein Oite to claim 1, wherein the spectroscopic unit, flame detection and combustion diagnosis apparatus, characterized in that a prism or Kaiori grating. 3. Oite to claim 1, wherein the spectroscopic unit, flame detection and combustion diagnosis apparatus characterized by being composed of a multilayer interference filter. 4. Oite to claim 1, wherein the photoelectric conversion unit,
A flame detection and combustion diagnosis device, which is arranged at a position where light from the spectroscopic unit is directly received. 5. A Oite to claim 1, wherein the photoelectric conversion unit,
A flame detection and combustion diagnosis apparatus, wherein light from the beam splitting unit is received via an optical fiber. 6. The flame detection and combustion diagnosis apparatus according to claim 3 , wherein the multilayer interference filter is housed in a glass block.