Flame state determination device

Abstract

The present invention addresses the problem of making it possible to determine the state of a flame using an ultraviolet sensor for monitoring the presence or absence of the flame. The invention relates to a flame state determination device. The adjustment unit (102) adjusts the amount of ultraviolet light generated by the flame (131) and measured by the measurement unit (101). The adjustment unit (102) may include, for example, an aperture mechanism that reduces light including ultraviolet rays generated by the flame (131) and reaching the measurement unit (101). Furthermore, for example, the adjustment unit (102) adjusts the amount of ultraviolet light generated by the flame (131) and measured by the measurement unit (101) by adjusting the sensitivity of ultraviolet light measured by the measurement unit (101).

Description

Technical Field

[0001] The present invention relates to a flame state determination device. Background Art

[0002] The state of the flame of combustion devices such as combustion furnaces, drying furnaces, and boilers affects, for example, the thermal efficiency of the combustion device. Therefore, it is important to grasp the state of the flame of the combustion device. Since the state of the flame of the combustion device is determined by the flame conditions, it is necessary to determine the flame conditions.

[0003] The state of the flame mainly changes under two conditions: the combustion amount and the air ratio. The combustion amount is the amount of heat to be generated using the combustion device (the flow rate of the combustible gas supplied to the burner of the combustion device). If the combustion amount is changed, mainly the shape or size of the flame changes. The air ratio is the amount of air when the amount of air that completely burns the supplied combustible gas is set to 1, and is usually adjusted so that the air ratio is always around 1.1 to 1.2. If the air ratio changes, in addition to the shape or size of the flame changing, the color of the flame also changes.

[0004] On the other hand, for monitoring combustion, a flame detection device (Patent Document 1) is used. The flame detection device is used to monitor the presence or absence of a flame at the burner of the combustion device, and a ultraviolet sensor is used. Since a flame emits ultraviolet rays, by detecting the presence or absence of the emitted ultraviolet rays using the ultraviolet sensor, the presence or absence of the flame can be monitored. In addition, the ultraviolet sensor is not limited to measuring the presence or absence of a flame, and can also measure the amount of ultraviolet rays. It has been found that the amount of ultraviolet rays emitted by a flame changes according to the shape, size, and color of the flame.

[0005] [Prior Art Documents]

[0006] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2023-106773 Summary of the Invention

[0008] [Problems to be Solved by the Invention]

[0009] Based on the above content, by measuring the amount of ultraviolet rays emitted by the flame, the state of the flame can be speculated to a certain extent and judged. However, for the combustion devices actually used, they are not limited to being operated under certain usage conditions. Therefore, in order to improve the accuracy of speculating the state of the flame, there is room for improvement. In addition, generally speaking, in order to reliably detect the presence or absence of the flame, the ultraviolet sensor is set at a position or angle where it can receive as much ultraviolet rays from the flame as possible. Therefore, in most cases, the amount of ultraviolet rays measured by the used ultraviolet sensor is measured in a state where it reaches the upper limit of the measurement range of the ultraviolet sensor. As a result, the change in the amount of ultraviolet rays caused by the change in the shape, size, and color of the flame cannot be captured, and thus the state of the flame cannot sometimes be judged.

[0010] The present invention is made to solve the above-mentioned problems, and its object is to improve the accuracy of speculating the state of the flame. In addition, its object is to be able to judge the state of the flame by using an ultraviolet sensor for monitoring the presence or absence of the flame.

[0011] [Technical means for solving the problem]

[0012] The flame state determination device of the present invention includes: a measurement unit that measures the ultraviolet rays generated by the flame generated by the combustion device; an acquisition unit configured to acquire the combustion amount of the flame; a storage unit configured to store the reference of the ultraviolet ray amount and the combustion amount; and a determination unit configured to determine the state of the flame by comparing the ultraviolet ray amount measured by the measurement unit and the combustion amount acquired by the acquisition unit with the reference.

[0013] In the flame state determination device, the storage unit stores a model representing the relationship between the ultraviolet ray amount and the combustion amount, and the determination unit determines the state of the flame by comparing the measured ultraviolet ray amount and the combustion amount acquired by the acquisition unit with the model.

[0014] In the flame state determination device, it includes a model making unit, and the model making unit makes a model related to the ultraviolet ray amount and the combustion amount stored in the storage unit according to the ultraviolet ray amount measured by the measurement unit and the combustion amount acquired by the acquisition unit.

[0015] In the flame state determination device, the storage unit stores a model representing the relationship between the ultraviolet ray amount, the combustion amount, and the air ratio, and the determination unit speculates the air ratio by comparing the ultraviolet ray amount measured by the measurement unit and the combustion amount acquired by the acquisition unit with the model, and uses it as the state of the flame.

[0016] In a structural example of the flame state determination device, the acquisition unit acquires the air ratio during model production. The flame state determination device includes a model production unit that produces a model stored in the storage unit, which represents the relationship among the ultraviolet ray amount, the combustion amount, and the air ratio, based on the ultraviolet ray amount measured by the measurement unit and the combustion amount and air ratio acquired by the acquisition unit.

[0017] In a structural example of the flame state determination device, the acquisition unit acquires the combustion amount, the air temperature, and the furnace internal pressure. The storage unit stores a model representing the relationship among the ultraviolet ray amount, the combustion amount, the air temperature, the furnace internal pressure, and the air ratio. The determination unit estimates the air ratio, as the state of the flame, by comparing the ultraviolet ray amount measured by the measurement unit and the combustion amount, the air temperature, and the furnace internal pressure acquired by the acquisition unit with the model.

[0018] In a structural example of the flame state determination device, the acquisition unit acquires the air ratio during model production. The flame state determination device includes a model production unit that produces a model stored in the storage unit, which represents the relationship among the ultraviolet ray amount, the combustion amount, the air temperature, the furnace internal pressure, and the air ratio, based on the ultraviolet ray amount measured by the measurement unit and the combustion amount and air temperature and furnace internal pressure acquired by the acquisition unit.

[0019] In a structural example of the flame state determination device, an adjustment unit is included, and the adjustment unit is configured to adjust the ultraviolet ray amount generated by the flame and measured by the measurement unit.

[0020] In a structural example of the flame state determination device, the adjustment unit includes: an optical introduction structure that introduces the ultraviolet ray measured by the measurement unit into the measurement unit and is configured in a cylindrical shape; and a field of view adjustment unit that is configured to adjust the monitoring position of the flame for ultraviolet ray introduction.

[0021] [Effects of the Invention]

[0022] As described above, according to the present invention, since the comparison of the ultraviolet ray amount measured by the measurement unit and the combustion amount of the flame acquired by the acquisition unit with a reference is performed, the accuracy of estimating the state of the flame can be improved. Further, according to the present invention, since the adjustment unit adjusts the ultraviolet ray amount generated by the flame and measured by the measurement unit, the state of the flame can be determined using an ultraviolet ray sensor for monitoring the presence or absence of the flame. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1A It is a structural view showing the structure of the flame state determination device according to Embodiment 1 of the present invention.

[0024] Figure 1B It is a flowchart for explaining an operation example of the flame state determination device according to Embodiment 1 of the present invention.

[0025] Figure 2A It is a structural diagram showing the structure of the flame state determination device according to Embodiment 2 of the present invention.

[0026] Figure 2B It is a flowchart for explaining an operation example of the flame state determination device according to Embodiment 2 of the present invention.

[0027] Figure 3A It is an explanatory diagram of a model produced by the model production unit 107 of the flame state determination device according to Embodiment 1 of the present invention.

[0028] Figure 3B It is an explanatory diagram of a model produced by the model production unit 107 of the flame state determination device according to Embodiment 1 of the present invention.

[0029] Figure 3C It is an explanatory diagram of a model produced by the model production unit 107 of the flame state determination device according to Embodiment 1 of the present invention.

[0030] Figure 3D It is an explanatory diagram of a model produced by the model production unit 107 of the flame state determination device according to Embodiment 1 of the present invention.

[0031] Figure 3E It is an explanatory diagram for explaining the determination of the usage model of the determination unit 105 of the flame state determination device according to Embodiment 1 of the present invention.

[0032] Figure 3F It is an explanatory diagram for explaining the determination of the usage model of the determination unit 105 of the flame state determination device according to Embodiment 1 of the present invention.

[0033] Figure 4 It is a structural diagram showing a part of the structure of another flame state determination device according to an embodiment of the present invention.

[0034] Figure 5 It is a structural diagram showing the hardware structure of the acquisition unit 103, storage unit 104, determination unit 105, and model production unit 107 of the flame state determination device according to an embodiment of the present invention.

[0035] [Explanation of symbols]

[0036] 101: Measurement unit

[0037] 102: Adjustment unit

[0038] 103: Acquisition unit

[0039] 104: Storage unit

[0040] 105: Determination unit

[0041] 106: Display unit

[0042] 131: Flame Detailed implementation manners

[0043] The present invention focuses on the fact that although the ultraviolet ray amount and the combustion amount are in a non - linear relationship, they are in a monotonic relationship (mutually monotonic relationship), and is realized by adopting a structure based on the ultraviolet ray amount and the combustion amount. The flame state determination device of the implementation manner of the present invention will be described below.

[0044] [Embodiment 1]

[0045] First, with reference to Figure 1A The flame state determination device of Embodiment 1 of the present invention will be described. The flame state determination device includes a measurement unit 101, an adjustment unit 102, an acquisition unit 103, a storage unit 104, a determination unit 105, and a display unit 106.

[0046] The measurement unit 101 measures the ultraviolet rays generated by the flame 131 generated by a combustion device (not shown).

[0047] The measurement unit 101 may include, for example, an ultraviolet sensor such as an ultraviolet detection tube that detects ultraviolet rays in a specified wavelength range. The ultraviolet detection tube is a discharge tube in which, when ultraviolet rays radiated from the flame are incident in a state where a high voltage is applied between a pair of electrodes provided in a glass tube, a discharge is generated between the electrodes.

[0048] The adjustment unit 102 adjusts the amount of ultraviolet rays generated by the flame 131 and measured by the measurement unit 101. The adjustment unit 102 may include, for example, an aperture mechanism that narrows the light including the ultraviolet rays generated by the flame 131 and reaching the measurement unit 101. Additionally, for example, the adjustment unit 102 adjusts the sensitivity of the ultraviolet rays measured by the measurement unit 101, thereby adjusting the amount of ultraviolet rays generated by the flame 131 and measured by the measurement unit 101.

[0049] The acquisition unit 103 acquires data related to the combustion amount of the flame 131. For example, the acquisition unit 103 acquires data related to the combustion amount such as the gas flow rate, air flow rate, gas pressure, air pressure, operation amount (control valve opening, frequency or rotational speed of a blower motor, etc.) of a combustion device (not shown). Additionally, the acquisition unit 103 can acquire the air temperature and furnace pressure of a combustion device (not shown). Additionally, the acquisition unit 103 can arbitrarily acquire the air ratio.

[0050] The storage unit 104 stores the benchmarks for the amount of ultraviolet rays and the amount of combustion. The storage unit 104 can store a model representing the relationship between the amount of ultraviolet rays and the amount of combustion. In addition, the storage unit 104 can store a model representing the relationship between the amount of ultraviolet rays, the amount of combustion, and the air ratio (a model for estimating the air ratio) as a benchmark. The storage unit 104 can store a model representing the relationship between the amount of ultraviolet rays, the amount of combustion, the air ratio, the air temperature, and the furnace pressure (a model for estimating the air ratio). In addition, the storage unit 104 stores, for example, the upper limit value and the lower limit value of the amount of ultraviolet rays for each of the plurality of set amounts of combustion as a determination unit (benchmark).

[0051] The determination unit 105 determines the state of the flame 131 by comparing the amount of ultraviolet rays measured by the measurement unit 101 and the amount of combustion of the flame acquired by the acquisition unit 103 with the benchmark. For example, the determination unit 105 estimates the air ratio by applying the amount of ultraviolet rays measured by the measurement unit 101 and the amount of combustion acquired by the acquisition unit 103 to the model stored in the storage unit 104 as a benchmark (comparing with the model), and sets it as the determination result of the state of the flame 131. For example, it is compared with a model representing the relationship between the amount of ultraviolet rays and the amount of combustion, a model representing the relationship between the amount of ultraviolet rays, the amount of combustion, and the air ratio, and a model representing the relationship between the amount of ultraviolet rays, the amount of combustion, the air ratio, the air temperature, and the furnace pressure. For example, the air ratio can be estimated by comparing with a model representing the relationship between the amount of ultraviolet rays, the amount of combustion, and the air ratio (a model for estimating the air ratio) or a model representing the relationship between the amount of ultraviolet rays, the amount of combustion, the air ratio, the air temperature, and the furnace pressure (a model for estimating the air ratio). In addition, for example, the determination unit 105 determines whether the amount of ultraviolet rays measured by the measurement unit 101 exceeds the benchmark region of the upper limit value and the lower limit value based on the amount of combustion acquired by the acquisition unit 103. The determination result obtained by the determination unit 105 is displayed on the display unit 106.

[0052] Next, refer to Figure 1B An operation example of the flame state determination device according to the first embodiment will be described. First, in step S101, the adjustment unit 102 adjusts the amount of ultraviolet rays generated by the flame 131 and measured by the measurement unit 101. Next, in step S102, the measurement unit 101 acquires ultraviolet rays, and the acquisition unit 103 acquires other flame-related data. Next, in step S103, the determination unit 105 estimates the flame state or the air ratio based on the model stored in the storage unit 104 and the acquired data.

[0053] According to Embodiment 1, since the storage unit 104 stores the reference values of the ultraviolet ray amount and the combustion amount, it is possible to compare the ultraviolet ray amount measured by the measurement unit 101 and the combustion amount of the flame acquired by the acquisition unit 103 with the reference values. Furthermore, even if the measurement unit 101 is arranged at a position where it can receive as much ultraviolet rays from the flame 131 as possible, the adjustment unit 102 can limit the ultraviolet ray amount measured by the measurement unit 101. Therefore, it is possible to capture the change in the ultraviolet ray amount caused by the change in the shape, size, and color of the flame 131. As a result, according to Embodiment 1, by using the ultraviolet sensor for monitoring the presence or absence of the flame, the state of the flame 131 can be accurately determined.

[0054] [Embodiment 2]

[0055] Next, Figure 2A a description will be given of the flame state determination device according to Embodiment 2 of the present invention. Similar to Embodiment 1, the flame state determination device includes a measurement unit 101, an adjustment unit 102, an acquisition unit 103, a storage unit 104, a determination unit 105, and a display unit 106.

[0056] In Embodiment 2, a model creation unit 107 is further included. The model creation unit 107 creates a reference related to the ultraviolet ray amount and the combustion amount based on the ultraviolet ray amount measured by the measurement unit 101 and the combustion amount of the flame acquired by the acquisition unit 103. The model creation unit 107 can use data related to the flame state, such as the ultraviolet ray amount measured by the measurement unit 101, the combustion amount acquired by the acquisition unit 103, the air ratio, the temperature, and the furnace internal pressure, to create the reference.

[0057] The model creation unit 107 can create a model for estimating the air ratio based on the ultraviolet ray amount measured by the measurement unit 101, the combustion amount acquired by the acquisition unit 103, and the air ratio as the reference. In addition, the model creation unit 107 can create a model for estimating the air ratio based on the ultraviolet ray amount measured by the measurement unit 101, the combustion amount acquired by the acquisition unit 103, the air ratio, the air temperature, and the furnace internal pressure. The reference (model) created by the model creation unit 107 is stored in the storage unit 104. For example, the storage unit 104 can store a model for estimating the air ratio, a reference (model) related to the ultraviolet ray amount and the combustion amount, a model representing the relationship between the ultraviolet ray amount, the combustion amount, and the air ratio, and a model representing the relationship between the ultraviolet ray amount, the combustion amount, the air ratio, the air temperature, and the furnace internal pressure.

[0058] Next, Figure 2B an operation example of the flame state determination device according to Embodiment 2 will be described. First, in step S101, the adjustment unit 102 adjusts the ultraviolet ray amount generated by the flame 131 and measured by the measurement unit 101.

[0059] Next, in step S104, the model production unit 107 determines whether a reference (model) is stored in the storage unit 104. When a model is stored in the storage unit 104 (Yes in step S104), in step S102, the measurement unit 101 acquires ultraviolet rays, and the acquisition unit 103 acquires other flame-related data. Next, in step S103, the determination unit 105 infers the flame state or the air ratio based on the model stored in the storage unit 104 and the acquired data.

[0060] On the other hand, when no model is stored in the storage unit 104 (No in step S104), in step S105, the measurement unit 101 acquires ultraviolet rays, and the acquisition unit 103 acquires other flame-related data. Next, in step S106, the model production unit 107 produces a model for inferring the flame state or the air ratio based on the acquired data. Thereafter, in step S102, the measurement unit 101 acquires ultraviolet rays, and the acquisition unit 103 acquires other flame-related data. Next, in step S103, the determination unit 105 infers the flame state or the air ratio based on the model stored in the storage unit 104 and the acquired data.

[0061] Regarding the model, a more detailed description will be given. For example, the air ratio is changed at a prescribed interval (0.2 step), the combustion amount (the amount of combustion gas supplied to the burner) is changed at each air ratio, and the combustion device is operated. The measurement unit 101 measures the ultraviolet rays generated by the flame 131 when the combustion device is operated under each condition. Based on these measurement results, the model production unit 107 obtains the relationship between the change in the ultraviolet ray amount and the change in the combustion amount for each air ratio. The model production unit 107 stores the obtained relationship f under each air ratio in the storage unit 104 as a model representing the relationship among the combustion amount, the air ratio, and the ultraviolet ray amount.

[0062] The model produced as described above can be used to apply the measured ultraviolet ray amount and the value of the combustion amount when the ultraviolet ray amount is measured to each relationship f, and infer the air ratio based on the matching relationship f. When the inferred air ratio is different from the normal air ratio, it can be determined that the state of the combustion device (flame 131) is abnormal.

[0063] For example, the model (ultraviolet ray characteristics of the burner) is obtained as shown below and stored in the storage unit 104.

[0064] First, at a certain air ratio (for example, 0.9), the ultraviolet ray amount is measured for a certain time for each combustion amount ( Figure 3A ). The relationship v = f(e, r = 0.9) between the combustion amount and the ultraviolet ray amount when the air ratio is 0.9 is inferred ( Figure 3B ).

[0065] Set the air ratio to 1.1, measure the ultraviolet ray amount in the same manner as described above, and infer the relationship v = f(e, r = 1.1) between the combustion amount and the ultraviolet ray amount when the air ratio is 1.1 ( Figure 3C ).

[0066] Perform the measurement and inference in the same manner for all air ratios (e.g., 0.9, 1.1, 1.3), infer the relationship v = f(e, r = 1.3) between the combustion amount and the ultraviolet ray amount when the air ratio is 1.3, and thereby obtain the ultraviolet ray characteristics (ultraviolet ray amount with respect to the air ratio and the combustion amount) of the burner ( Figure 3D ).

[0067] By using the ultraviolet ray characteristics of the burner obtained as described above, the determination unit 105 estimates the air ratio during actual operation.

[0068] For example, in a combustion device where the air ratio should be 1.1, when the ultraviolet ray amount measured by the measurement unit 101 at the combustion amount e1 reaches v1, it approaches the relationship v = f(e, r = 1.1) of the air ratio 1.1, and it can be determined as normal ( Figure 3E ).

[0069] In the combustion device where the air ratio should be 1.1, when the ultraviolet ray amount measured by the measurement unit 101 at the combustion amount e1 after one year reaches v2, it approaches the relationship v = f(e, r = 9) of the air ratio 0.9. It is inferred that the air ratio has decreased, and it can be determined as abnormal ( Figure 3F ).

[0070] Incidentally, generally speaking, as Figure 4 shown, the measurement unit 101 is housed in a cylindrical light guiding structure 121. The light guiding structure 121 includes an introduction port 122 for introducing ultraviolet rays to be measured at one end side, and the measurement unit 101 is provided at the other end side. Through the light guiding structure 121, the ultraviolet rays from the flame 131 measured by the measurement unit 101 can be selectively introduced into the measurement unit 101. For example, by arranging the flame 131 on the optical path connecting the measurement unit 101 and the introduction port 122, the ultraviolet rays emitted by the flame 131 can be selectively measured.

[0071] Here, as long as the position of the introduction port 122 is offset in the direction intersecting the optical path by the visual field adjustment unit 123 to adjust the monitoring position of the flame for ultraviolet ray introduction of the light guiding structure 121, the visual field measured by the measurement unit 101 can be changed. By changing the visual field measured by the measurement unit 101, the change in the ultraviolet ray amount caused by the change in the shape, size, and color of the flame 131 can be captured more accurately in consideration of the swaying / unsteadiness of the flame or the relative position between the flame 131 and the measurement unit 101.

[0072] In addition, as Figure 5 shown, the acquisition unit 103, storage unit 104, determination unit 105, and model creation unit 107 of the embodiment can be configured as a computer device including a central processing unit (CPU) 301, main storage device 302, external storage device 303, network connection device 304, and the like. The network connection device 304 is connected to the network 305. Through the program expanded in the main storage device 302 of the computer device, the CPU 301 operates (executes the program), thereby implementing the functions of the acquisition unit 103, storage unit 104, determination unit 105, and model creation unit 107.

[0073] In addition, the acquisition unit 103, storage unit 104, determination unit 105, and model creation unit 107 of the embodiment can also include programmable logic devices (PLDs) such as field-programmable gate arrays (FPGAs). For example, by including each of the acquisition unit 103, storage unit 104, determination unit 105, and model creation unit 107 as circuits in the logic elements of the FPGA, it can function as a flame state determination device. Each of the acquisition circuit, storage circuit, determination circuit, and reference creation circuit can be connected to a prescribed writing device to write to the FPGA. In addition, the respective circuits written to the FPGA can be confirmed through the writing device connected to the FPGA.

[0074] As described above, according to the present invention, the amount of ultraviolet rays generated by the flame and measured by the measurement unit is adjusted by the adjustment unit, so the state of the flame can be determined using an ultraviolet sensor for monitoring the presence or absence of the flame. Since the measurement unit for measuring ultraviolet rays is arranged at a position where it can receive as much ultraviolet rays from the flame as possible, in the ignited state, the amount of ultraviolet rays from the flame exceeds the measurement range of the measurement unit. In such a state, the change in the amount of ultraviolet rays caused by the change in the shape, size, and color of the flame cannot be captured by the measurement unit. In contrast, if the amount of ultraviolet rays measured by the measurement unit is limited by the adjustment unit, the change in the amount of ultraviolet rays caused by the change in the shape, size, and color of the flame can be captured. As a result, the state of the flame can be accurately determined using the measurement unit for ultraviolet rays for monitoring the presence or absence of the flame.

[0075] In addition, the present invention is not limited to the embodiments described above, and it is obvious that various modifications and combinations can be implemented by those skilled in the art within the technical idea of the present invention.

Claims

1. A flame state determination device, comprising: A measurement unit that measures ultraviolet rays generated by a flame produced by a combustion device; An acquisition unit configured to acquire the combustion amount of the flame; A storage unit configured to store the benchmarks of the ultraviolet ray amount and the combustion amount; And A determination unit configured to determine the state of the flame by comparing the ultraviolet ray amount measured by the measurement unit and the combustion amount acquired by the acquisition unit with the benchmarks.

2. The flame state determination device according to claim 1, wherein The storage unit stores a model representing the relationship between the ultraviolet ray amount and the combustion amount, The determination unit determines the state of the flame by comparing the measured ultraviolet ray amount and the combustion amount acquired by the acquisition unit with the model.

3. The flame state determination device according to claim 2, comprising: A model creation unit that creates the model related to the ultraviolet ray amount and the combustion amount stored in the storage unit based on the ultraviolet ray amount measured by the measurement unit and the combustion amount acquired by the acquisition unit.

4. The flame state determination device according to claim 2, wherein The storage unit stores the model representing the relationship between the ultraviolet ray amount, the combustion amount, and the air ratio, The determination unit infers the air ratio by comparing the ultraviolet ray amount measured by the measurement unit and the combustion amount acquired by the acquisition unit with the model, and takes it as the state of the flame.

5. The flame state determination device according to claim 4, wherein The acquisition unit acquires the air ratio during model creation, The flame state determination device includes: a model creation unit that creates the model representing the relationship between the ultraviolet ray amount, the combustion amount, and the air ratio stored in the storage unit based on the ultraviolet ray amount measured by the measurement unit and the combustion amount, air ratio acquired by the acquisition unit.

6. The flame state determination device according to claim 2, wherein The acquisition unit acquires the combustion amount, the air temperature, and the furnace internal pressure, The storage unit stores the model representing the relationship between the ultraviolet ray amount, the combustion amount, the air temperature, the furnace internal pressure, and the air ratio, The determination unit infers the air ratio by comparing the ultraviolet ray amount measured by the measurement unit and the combustion amount, air temperature, furnace internal pressure acquired by the acquisition unit with the model, and takes it as the state of the flame.

7. The flame state determination device according to claim 6, wherein The acquisition unit acquires the air ratio during model creation, The flame state determination device includes: a model creation unit that creates the model representing the relationship between the ultraviolet ray amount, the combustion amount, the air temperature, the furnace internal pressure, and the air ratio stored in the storage unit based on the ultraviolet ray amount measured by the measurement unit and the combustion amount, air temperature, furnace internal pressure acquired by the acquisition unit.

8. The flame state determination device according to any one of claims 1 to 7, comprising: An adjustment unit configured to adjust the ultraviolet ray amount generated by the flame and measured by the measurement unit.

9. The flame state determination device according to claim 8, wherein The adjustment unit includes: An optical introduction structure that introduces the ultraviolet rays measured by the measurement unit into the measurement unit and is configured to be cylindrical; and The visual field adjustment unit is configured to adjust the monitoring position of the flame for ultraviolet ray introduction.

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