JPH01210720A - Burning condition monitoring device - Google Patents

Abstract

PURPOSE:To provide an operator with a proper guidance, by a method wherein the comparison and checking of an information on the nature of the flame of a burner, which produces burning condition, and another information on the nature of exhaust gas in an exhaust gas flow passage are permitted with respect to respective burners. CONSTITUTION:Measuring points, corresponding to respective burners 1 one-to-one, are set in the predetermined sections 16 of the flow passage of exhaust gas or a flue 12 while exhaust gas, sucked from respective measuring points is supplied to a gas analyzer 18. One set of luminous intensity distribution measuring means 33 is provided so as to correspond to a plurality of burners whereby the nature of flames of a plurality of burners can be measured by one set of the luminous intensity distribution measuring means 33. Information on the nature of exhaust gas, which is obtained by the gas analyzer 18, and another information on the flames, which is obtained by the luminous intensity distribution measuring means 33, are inputted into a central processing unit 28 whereby the burning conditions of respective burners 1 are decided whether they are within an allowable range or they are really abnormal. When the central processing unit 28 decides that the burning condition is really abnormal, the central processing unit 28 calls the attention of an operator by the sound of a buzzer or the like and indicates an operation guidance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a combustion state monitoring device in a combustion device such as a large boiler, and particularly to a device for accurately monitoring the combustion state of each burner in a device having a plurality of burners. The present invention relates to a combustion state monitoring device that can provide operational support to an operator.

[Conventional technology]

BACKGROUND ART Multi-burner systems in which a large number of burners are installed are used in large-scale combustion equipment for various industries, including large-scale boilers for thermal power plants.

In such a multi-burner system, the combustion state of each burner often differs, making it difficult to control the combustion state appropriately. Further, the large fluctuation range of load requests due to day/night, holidays, etc., and the requirement for rapid response, also make control difficult. Furthermore, to ensure the security of supply of fossil fuels such as oil, coal, and gas,
There is a trend toward multiple coal types and longer oil types, which is also one of the factors that complicates combustion control. Furthermore, when these fuels are burned, air pollutants in the exhaust gas such as nitrogen oxides (NOX), sulfur oxides (SOX), unburned components, and soot must be reduced as much as possible. Since the occurrence of these phenomena is affected by the multiple rotors of the combustion system, this is also a factor that makes combustion control difficult.

However, the advancement of operating technology for highly efficient combustion,
There is a strong demand to reduce the number of operators (the conventional uniform combustion control for the entire combustion equipment requires a lot of time and effort, so the combustion status of each individual burner must be constantly monitored). Therefore, driving support systems are being developed that quickly make the operator aware of the occurrence of an abnormality and provide countermeasure driving guidance.

One method of the combustion state monitoring device for driving support is disclosed in Japanese Patent Application Laid-open No. 61-31816, which was previously proposed by the applicant of the present application.
There are techniques found in Japanese Utility Model Application Publication No. 62-63552. The combustion state monitoring devices disclosed in these earlier applications measure the properties of exhaust gas at multiple points on a predetermined cross section of the exhaust gas flow path based on the recognition that the flow of exhaust gas is approximately laminar, and then The combustion state of the burner was ascertained using exhaust gas property measurement information, and operational guidance was provided for individual burners or groups of burners.

In addition, as another technique for a combustion state monitoring device for driving support, the applicant of the present invention also proposed the method disclosed in Japanese Unexamined Patent Publication No. 62
There is a technique found in Japanese Patent No.-134418. The combustion state monitoring device disclosed in this prior application optically measures the flame properties of each burner, and provides operational guidance for each burner or a group of burners based on this flame property measurement information.

[Problem to be solved by the invention]

The methods seen in the above two conventional technologies are one that promotes the distribution of exhaust gas properties in the exhaust gas flow path (flue), and the other that measures the light intensity distribution in the primary combustion region of the flame. Combustion conditions are monitored using only one side of the information, which is too sensitive to provide optimal comments and guidance to operators, and can cause anxiety to operators or sometimes give incorrect analysis results. In some cases, it was.

In addition, the flow of exhaust gas in the exhaust gas passage changes slightly due to the influence of the flow in the passage due to changes in the burner pattern used, boiler load, etc., so the exhaust gas property measurement point and the corresponding burner are always 100% There was no guarantee that it would be possible to respond and identify the problem with certainty.

Furthermore, when coal is used as a fuel, the light intensity of the burner flame produced by pulverized carbonized coal is excessively affected by coal properties such as volatile content and ash content, which poses a problem in the reliability of the latter combustion monitoring system mentioned above. There was a risk that it would be given.

Therefore, the technical problem to be solved by the present invention is to solve the above-mentioned problems of the prior art. An object of the present invention is to provide a condition monitoring device.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the combustion state monitoring device of the present invention provides one burner for each burner set for a predetermined cross section of the exhaust gas flow path in a combustion device equipped with a plurality of burners. gas analysis means for measuring the gas at each of a plurality of measurement points corresponding to pair 1; a light intensity distribution measuring means for measuring the light intensity distribution of the flame for each burner; and the gas analysis means at a predetermined measurement point. collating means for collating the information regarding the exhaust gas properties obtained by the above measurement point with the information regarding the burner flame properties obtained by the light intensity distribution measuring means in the burner corresponding to the predetermined measurement point, and determining whether or not the characteristics according to both pieces of information match; and is configured to issue operational guidance based on the verification result by the verification means and the information regarding the exhaust gas properties and/or the information regarding the burner flame properties.

[Effect]

Since the present invention is configured as described above, the flame property information measured by the burner that creates the combustion state and the exhaust gas property information in the exhaust gas flow path that appears as a result of this can be matched and compared for each burner. Since the information on the side and result side is compared, it is possible to accurately understand the combustion status of each burner.
Based on this, it becomes possible to provide appropriate guidance using case study information prepared in advance and each measurement information.

〔Example〕

Hereinafter, the present invention will be explained with reference to illustrated embodiments.

1 to 8 relate to one embodiment of the present invention, and FIG. 1 is an explanatory diagram showing a combustion state monitoring device partially in blocks.

In Fig. 1, 1... is a burner, and a large number of burners are installed on the morning side and the afternoon side of the furnace 2 of the boiler device (combustion device), and each burner 1 is supplied with fuel from the fuel pipe 3. Fuel is supplied with the flow rate controlled individually by the fuel flow control valve 4. In addition, combustion air heated by an air preheater 7 via a damper 5 and a combustion air fan 6 is supplied from a wind box 8 to each burner 1 with its flow rate controlled individually, and the burner flame is heated in the furnace 2. form 9. Furthermore, each burner l is provided with a swirler, an air register, a flame holder, etc., although not shown.

The high temperature combustion gas from the furnace 2 is transferred to a superheater 10, W1.
It reaches the flue 12 through the return device 1) 9, a denitrification device (not shown),
It is discharged from the system through an electrostatic precipitator, etc.

At this time, part of the exhaust gas is transferred to the damper 13 and the recirculation fan 14.
It is supplied to furnace 2 through (or may be supplied to burner 1)
, low NOX combustion is implemented.

At this time, the flow of exhaust gas is controlled even if obstacles such as the superheater IQ and the economizer 1) are placed in the flow path.
Furthermore, even if seal air leaks from the vent house 15, it is known that the seal air flows approximately in a layered manner as shown in FIG. Therefore, by measuring the exhaust gas properties such as the type and concentration distribution of the exhaust gas at a predetermined cross section of the exhaust gas flow path, the combustion state of each burner 1 corresponding to this measurement position can be estimated and understood quite accurately.

On the predetermined cross section of the exhaust gas flow path described above, that is, the predetermined cross section 16 of the flue 12 shown in FIG. It is set as follows. That is, lines 81 to B6 in the cross direction of the flue 12 and h1 to h6 in the height direction of the flue 12 shown in FIG.
The lattice points with the lines correspond to the above measurement points, and the tip suction port of the probe 17 for exhaust gas sampling is positioned at each measurement point, and the exhaust gas sucked by each probe I7 is sent to the gas analyzer 18. It is now being supplied.

Specifically, as shown in FIG. 4, each probe 17 is connected to a suction pipe 19, and connected to a suction pump 20 via valves S, -S7, and is also connected to a suction pump 20 through valves S, -S, . A sampling pipe 21 is branched, and the exhaust gas sampled for each probe 17 is sequentially supplied to the gas analyzer 18 from the sampling pipe 21. Note that the answer valves 31 to Sfi are controlled by the valve driving device 22. In this configuration, the suction pump 20
The system is in constant operation, sucking in a predetermined amount of exhaust gas at each measurement point, and constantly updating the exhaust gas to be sampled. In this state, the valve driving device 22 selectively and sequentially controls the responses S and -S7, and the exhaust gas at a predetermined negative measurement point is supplied to the gas analyzer 18.

Reference numeral 23 denotes a suction pump for sucking sample gas in the gas analyzer 18, and the sampled exhaust gas from the suction pump 23 is supplied to the analyzer 24. The analyzer 24 analyzes the properties of the exhaust gas, such as the type and concentration of the exhaust gas, and outputs this as an electrical signal to a subsequent circuit. In FIG. 4, reference numeral 25 denotes an n-channel sampling automatic switching device, and the sampling automatic switching device 25 controls the valve driving device 22 to arbitrarily set the exhaust gas sampling order at each measurement point as necessary. It is possible to select or change the sampling suction time width corresponding to each measurement point. By doing this, it is possible to preferentially perform exhaust gas analysis only at specific measurement points, shorten the sampling suction time for each individual when urgently obtaining analysis results, and lengthen the sampling suction time when a value close to the true value is desired. Can be set.

The data indicating the exhaust gas properties from the analyzer 24 of the gas analyzer 18 described above is once captured as data for each measurement point into a data recorder 26 having an n-channel scanner as shown in the first figure, and then transferred to the A/ D converter 2
7, the signal is converted into a digital signal and sent to the central processing unit 28. This central processing unit 28 compares the exhaust gas property information for each measurement point with information stored in advance as a case study in its own recording unit or external storage device 29, and refers to a predetermined calculation table. The result of calculation processing is
The results are outputted by an external output means such as the display 30 or the printer 31, and the results are stored in the external storage device 29 as necessary.

For example, the central processing unit 28 displays the concentration of CO, Oz, NOx, etc. in the exhaust gas at each measurement point as a plus or minus deviation value from the standard value on the display 30 for each measurement, and displays it to the operator. The gas concentration distribution within the flue 12 is made to be recognized by the user. That is,
As shown in FIG. 6 as an example, in the area corresponding to each measurement point on the display 30, the bar above the reference line L has a 0□ concentration and a co concentration higher than the reference value, and vice versa. It is designed to display that it is below. This display format can be changed as desired, such as directly displaying the deviation value or the true concentration in numbers, and the operator can freely select this using the keyboard input device 32. Furthermore, if the exhaust gas properties at a specific measurement point reach an abnormal value that exceeds a predetermined allowable range, this can be displayed in red or blinking to alert the operator.

On the other hand, in order to measure the burner flame properties of each burner 1 described above, an optical detection means is provided corresponding to each burner 1 or a group of burners. This optical detection means is for measuring the luminous intensity distribution of the burner flame,
Although an appropriate flame detector can be employed, in this embodiment, one luminous intensity distribution measuring means 33 as shown in FIG. It is said that flame properties can be measured.

That is, as shown in FIG. 5, the tip of the fine scope 34 is installed at a position where the interior of the furnace 2 can be observed, and the light from the burner flame is transmitted to the imaging means 36 via the fine scope 34 and optical systems such as the lens system 35. and the imaging means 36
Red (R), Green (G), Blue (B)
The light information is separated into three types, and the separated optical information is once taken in as an electric signal (analog signal) as data for each burner 1 into a data recorder 37 having a built-in scanner having an appropriate number of channels. The optical system 34, 35 and the imaging means 36 are integrated, and a drive means 38 moves the tip of the fine scope 34 to a desired burner 1.
The lens system 35 can move toward the flame, and the lens system 35 performs an AP (automatic focusing) operation accordingly.

Reference numeral 39 denotes an automatic measurement switching device which controls the drive means 38 to select the burner flames 9 to be measured sequentially or in a desired order. The control signal from this automatic measurement switching device 39 is also supplied to the data recorder 37.

The fine scope 34 is housed in a heat-resistant sleeve 40 to prevent thermal damage, and cooling air from a cooling air supply means 41 flows through the heat-resistant sleeve 40.

Further, 42 is a temperature sensor, and a temperature measurement unit 43 receiving the output from the temperature sensor controls the cooling air supply means 41 n! It is supposed to be done.

R, G as flame property information for each burner 1 described above,
The data stored in the data recorder 37 as the B spectral component signal is sent to the A/D converter 44 as shown in the first diagram.
The signal is converted into a digital signal and sent to the central processing unit 28. The central processing unit 28 divides the flame property information for each burner 1 into a large number of pixels in the virtual image frame, recognizes the intensity of the R, G, and B component brightness for each pixel, and divides the flame property information for each burner 1 into a large number of pixels. Calculate the brightness distribution of the flame.

That is, the data for dividing and defining the intensity of the luminance for the pixel into a large number of gradations is stored in advance in the storage unit of the central processing unit 28 itself or in the external recording device 29, and this and the input flame By comparing the information with the property information, the brightness intensity and its distribution of each pixel of the virtual image frame are calculated.

More specifically, in the central processing unit 28 or external storage device 29, R, G, and R, G, etc., as shown in FIG.
It is equipped with B component standard brightness information and a gradation division regulation table based on this information, and accurate brightness classification is performed for each burner 1 and boiler load. In addition, the central processing unit 28 or the external storage device 29 stores data regarding brightness distribution information such as flame area, flame dimensions, flame center of gravity, flame position, flame maximum and minimum brightness positions, etc. for each boiler load. A case study is stored in advance, and a calculation table based on this data is used to determine whether the brightness distribution of the virtual image frame for each burner flame 9 is within a good range.In other words, whether each burner flame 9 is in a good range It is now possible to judge whether or not the fuel is in a proper combustion state. Then, the central processing unit 28 displays the processing data regarding the flame properties of each burner I as necessary, for example, on the display 3.
0 along with the identification number of burner 1 as shown in Figure 8,
The positive side is displayed as good and the negative side is displayed as abnormal, and the processed data is also stored in the external storage device 29 as necessary.
Store it in.

In this embodiment, the central processing unit 28 is configured as described above.
1:1 to each burner 1 by the gas analyzer 18.
exhaust gas property information corresponding to and the light intensity distribution measuring means 3
3, flame property information of each burner 1 is input. The central processing unit 28 is also equipped with a calculation table for comparing and comparing the two pieces of information and determining whether the combustion state of each burner l is truly abnormal 4fLi outside of the allowable range. , the exhaust gas property information and the flame property information regarding a specific burner 1 are compared to see if their properties match using a predetermined comparison equation based on a case study, and it is determined whether they are within the allowable range or truly abnormal. It is now certified. For example, when it is determined that the exhaust gas properties corresponding to one burner I are abnormal based on the exhaust gas property information, the central processing unit 28 transmits the flame property information of the corresponding burner 1 at least once, preferably for a predetermined period of time. The various characteristic values based on the flame property information are compared with the characteristic values based on the exhaust gas properties, and if the comparison characteristic value difference is within a certain range, it is determined that it is truly abnormal. Further, when the comparison characteristic value difference exceeds a certain range, the exhaust gas property information indicating the abnormal value is considered to be transient, and abnormality determination is suspended, and the comparison is performed again after a predetermined period of time. In this way, the overly sensitive judgments that have become commonplace and the occasional erroneous judgments can be avoided as much as possible.

Then, as mentioned above, the central processing unit 2 consists of burner I.
Alternatively, if it is determined that the combustion state of the burner group is truly abnormal, for example, a buzzer sound is generated to certainly alert the operator, and the display 30 displays operational guidance for countermeasures. This operation guidance is output based on case study information in advance and the exhaust gas property information and/or burner flame property information. Supply amount and air supply amount and ゛20
% and increase the swirler output by 30% to generate a strong vortex. '', ``Since NOx is generated by the PM number 6.7 burner, the amount of exhaust gas supplied for this is reduced by 30%, and in order to increase the pressure in the reducing flame area to reduce NOx, each internal rotation It is now possible to give appropriate guidance to operators, such as "Please reduce the power of the equipment by 25% to weaken the vortex flow." Therefore, the operator can quickly and accurately respond to the ever-changing combustion conditions and perform operations, making it possible to perform advanced operations with fewer personnel. The above-mentioned operation guidance is output so that each burner 1 maintains the desired standard combustion state according to the boiler load and from the viewpoint of the entire combustion apparatus.In other words, the exhaust gas characteristics of each burner 1 are Information and flammability information are output so as to be standardized to reference values depending on each individual case.

FIG. 9 shows another embodiment of the present invention, in which the following configuration is added to the configuration of the previous embodiment.

That is, in this embodiment, each burner 1 is selectively injected with a tracer substance, for example, argon (Ar).
, gas such as helium (He), or aluminum (A
1) Substances that can be transported by combustion gas, such as powder, are injected. Reference numeral 45 denotes a tracer tank containing the tracer substance, and the tracer substance is fed from the tracer tank 45 through a supply pump 46, and then through tracer injection valves 47, injection nozzles 48, etc. provided for each burner 1, respectively.・
It is designed to be selectively supplied to each burner 1 via. Reference numeral 49 denotes valve drive control means, which controls the opening and closing states of each of the tracer injection valves 47 . . . .

In the above configuration, for example, if the arrangement of the first group of boilers on the front side of the can is horizontally A-D and vertically a-d as shown in No. 10E, a predetermined cross section of the flue 12 corresponding to each panat... The exhaust gas sampled from the probes 17 placed at each of the 16 measurement points (half of the total measurement points) causes the gas analyzer 18 to detect, for example, 0. Analyze the concentration, and based on this analysis information, the central processing unit 2
8 indicates the 0□ concentration at each measuring point corresponding to each burner l on the front side of the can as shown in the first part of the figure on the display 30. As is clear from this first) illustration,
Measurement point 02 in the exhaust gas flow path corresponding to burner 1 of Bb
It is assumed that the concentration is significantly low and the amount of combustion air supplied to burner 1 of Bb is abnormally small, but it is dangerous to assert with 100% certainty that the burner lacking combustion air is Bb.

Therefore, by operating the valve drive control means 49, the Bb
Only the tracer injection valve 47 corresponding to the burner 1 is opened for a predetermined time, and a predetermined amount of Ar gas (tracer substance), for example, is injected into the burner Bb and is transported to the flue 12 by the combustion gas flow.

The gas analyzer 18 similarly analyzes the concentration of Ar gas at measurement points corresponding to each burner I on the front side of the can, and the central processing unit 28 analyzes the concentration of Ar gas at each fixed point on each side corresponding to each burner I on the front side of the can. The 02 concentration and the Ar (tracer substance) concentration are combined and displayed on the display 30 as shown in Figure 12.

Then, as shown in Figure 12, when the measurement point with the highest A r ffA degree and the measurement point with the lowest 08 concentration coincide,
It is considered that the combustion state of burner 1 of Bb reflects the exhaust gas properties at the corresponding exhaust gas measurement point with extremely high accuracy, and the central processing unit 28 determines the combustion state of burner 1 of Bb.
i should be made normal (driving guidance will be output.

In this embodiment, by measuring the tracer substance concentration at each measurement point in the exhaust gas flow path, it is possible to correctly identify the burner corresponding to each exhaust gas outer pot measurement position, and to identify burner 1 or a group of burners in an abnormal combustion state. It is possible to provide accurate and prompt driving guidance without error. In the case of this embodiment, since the combustion state can be monitored with considerably high accuracy without referring to the flame property information of each burner 1, it is possible to omit the flame property measuring means in some cases. It is.

FIG. 13 shows a modification of the second embodiment of the latter described above, in which a movable probe 50 whose tip is movable to each position corresponding to the exhaust gas property measurement point is provided, and this is used as a probe exclusively for tracer detection. The movable prong 50 has a horizontal movement actuator 51 and a vertical movement actuator 52.
It is designed to be driven to a desired position by.

Furthermore, the present invention can be modified in various ways other than the embodiments described above without departing from the spirit of the present invention. For example, the sampling probe for measuring exhaust gas properties may be made movable as shown in Figure 13. However, it is also possible to use other means such as a spectrum analyzer as a means for measuring the luminous intensity distribution, and if the tracer substance is something other than gas, modifications such as the addition of a dedicated analysis device are conceivable; Of course, all of these are included within the scope of the claims.

〔Effect of the invention〕

As detailed above, according to the present invention, there is provided a combustion state monitoring device that can extremely accurately grasp and specify the combustion state of each burner and provide accurate and advanced operational guidance, and its industrial value is It's a huge amount.

[Brief explanation of the drawing]

1 to 8 relate to one embodiment of the present invention, in which FIG. 1 is an explanatory diagram showing a partially blocked combustion state monitoring device, FIG. 2 is a sectional view of a boiler showing the flow state of exhaust gas, and FIG. The figure is a cross-sectional view of the exhaust gas flow path showing the arrangement of the probe, Fig. 4 is an explanatory diagram showing the arrangement of piping with respect to the probe, Fig. 5 is a block diagram showing the light intensity distribution measuring means, and Fig. 6 is the diagram on the display. An explanatory diagram showing one form of display of exhaust gas concentration distribution,
Fig. 7 is a characteristic diagram showing the relationship between flame brightness and boiler load, Fig. 8 is an explanatory diagram showing one display form of flame property information displayed on the display, and Figs. 9 to 12 are illustrations of the present invention. Regarding other embodiments, Fig. 9 is an explanatory diagram showing a partial block diagram of the combustion state monitoring device, Fig. 10 is an explanatory diagram showing the arrangement of the boiler group on the can side, and Fig. 1) is an explanatory diagram showing the arrangement of the boiler group on the boiler side on the morning side. An explanatory diagram showing an example of the 0tta degree distribution at each exhaust gas property measurement point corresponding to the morning boiler group. Figure 12 is an example of the 0□ concentration distribution/tracer substance concentration distribution at each exhaust gas property measurement point corresponding to the morning side boiler group. FIG. 13 is an explanatory diagram showing a modification of the latter embodiment. 1...burner, 2...furnace, 3...
... Fuel piping, 4... Fuel flow control valve, 5.
...damper, 6...combustion air fan,
7... Air preheater, 8... Wind box, 9.
...Burner flame, 10...Superheater, 1)
...Coal saver, 12...Flute, 13...
... Damper, 14 ... Recirculation fan, 15
......Vent house, 16...Predetermined cross section of exhaust gas flow path (flue), 17...Probe,
18... Gas analyzer, 19... Suction piping, S, -S,... Valve, 20... Suction pump, 21...・Sampling piping, 22・
... Valve drive device, 23 ... Suction pump,
24... Analyzer, 25... Automatic sampling switching device, 26... Data recorder, 28... Central processing unit, 29...
・External storage device, 30...Display, 31
... Printer, 32 ... Keyboard input device, 33 ... Light intensity distribution measuring means, 34 ...
... Fine scope, 35 ... Lens system, 36 ... Imaging means, 37 ... Data recorder, 38 ... Drive means, 39 ... ...
・Automatic switching device, 40...Heat-resistant sleeve,
41... Cooling air supply means, 42...
Temperature sensor, 43...Temperature measurement section, 44...
...A/D converter, 45...Tracer tank, 46...Supply pump, 47...
Tracer injection valve, 48... Injection nozzle, 49.
... Valve drive control means, 50 ... Movable prong, 51 ... Lateral movement actuator, 52
...Actuator for vertical movement. Figure 5 Figure 6 Figure 2: 02 Density Mercenary 1) Katana: CO Nomaro's -L difference Il Figure 7 Figure 8 Figure 9 Figure 10 Figure 1) Figure

Claims (3)

[Claims] (1) a gas analysis means for measuring gas at each of a plurality of measurement points corresponding one-to-one to each burner set for a predetermined cross section of an exhaust gas flow path in a combustion device equipped with a plurality of burners; A light intensity distribution measuring means for measuring the light intensity distribution of the flame for each burner; information regarding exhaust gas properties obtained by the gas analysis means at a predetermined measurement point; and information based on the light intensity distribution measurement means at the burner corresponding to the predetermined measurement point. a collation means for collating information regarding burner flame properties and determining whether or not the characteristics according to both information match; A combustion state monitoring device characterized in that it issues driving guidance based on information regarding flame properties. (2) In claim (1), it is provided that operation guidance is output such that each exhaust gas property measurement information at each of the exhaust gas property measurement points and/or each burner flame property measurement information at each burner is standardized. Characteristic combustion condition monitoring device. (3) In claim (1), tracer injection means for injecting a tracer substance into any one of the burners;
tracer detection means for detecting the tracer substance at each of a plurality of measurement points corresponding one-to-one to each burner set for a predetermined cross section of the exhaust gas flow path, and measuring the distribution of the tracer substance in the exhaust gas flow path; A combustion state monitoring device characterized in that a burner or burner group corresponding to a position of an exhaust gas property measurement point is specified based on information.