Flame state determination device

Abstract

To provide a flame state determination device capable of determining a state of flame by using an ultraviolet sensor employed for monitoring the existence of the flame.SOLUTION: An adjustment part 102 adjusts the amount of ultraviolet which is generated from a flame 131 and which is measured by a measurement part 101. The adjustment part 102, for example, can be formed by a diaphragm mechanism for narrowing light including the ultraviolet which is generated from the flame 131 and which reaches the measurement part 101. Also, the adjustment part 102, for example, adjusts the sensitivity of the ultraviolet which is measured by the measurement part 101, so as to adjust the amount of the ultraviolet which is generated from the flame 131 and which is measured by the measurement part 101.SELECTED DRAWING: Figure 1A

Description

[Technical Field]

[0001] The present invention relates to a flame state determining device. [Background technology]

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

[0003] The state of a flame changes mainly depending on two conditions: the combustion amount and the air ratio. The combustion amount is the amount of heat you want to generate using the combustion device (the flow rate of combustible gas supplied to the burner of the combustion device). Changing the combustion amount mainly changes the shape and size of the flame. The air ratio is the amount of air when the amount of air required to completely combust 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. When the air ratio changes, the color of the flame changes in addition to the shape and size of the flame.

[0004] On the other hand, flame detection devices are used to monitor combustion (Patent Document 1). Flame detection devices are used to monitor the presence or absence of a flame in a burner in a combustion device, and an ultraviolet sensor is used. Because a flame emits ultraviolet rays, the presence or absence of a flame can be monitored by detecting the presence or absence of the emitted ultraviolet rays with an ultraviolet sensor. Furthermore, the ultraviolet sensor can measure not only the presence or absence of a flame, but also the amount of ultraviolet rays. It has been found that the amount of ultraviolet rays emitted from a flame varies depending on the shape, size, and color of the flame. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2023-106773 Summary of the Invention [Problem to be solved by the invention]

[0006] From the above, it is possible to estimate and determine the state of a flame to a certain extent by measuring the amount of ultraviolet radiation emitted from the flame. However, since combustion equipment used in reality is not necessarily operated under constant operating conditions, there is still room for improvement in order to improve the accuracy of estimating the state of the flame. In general, to reliably detect the presence or absence of a flame, ultraviolet sensors are installed at positions and angles that allow them to receive as much ultraviolet radiation from the flame as possible. For this reason, the amount of ultraviolet radiation measured by the ultraviolet sensor in use is often measured at the upper limit of the sensor's measurement range. As a result, it is sometimes impossible to detect changes in the amount of ultraviolet radiation due to changes in the shape, size, and color of the flame, making it impossible to determine the state of the flame.

[0007] The present invention has been made to solve the above problems, and aims to improve the accuracy of estimating the state of a flame, and also to make it possible to determine the state of a flame using an ultraviolet sensor that is used to monitor the presence or absence of a flame. [Means for solving the problem]

[0008] The flame state determination device of the present invention comprises a measurement unit that measures ultraviolet rays generated from a flame produced by a combustion device, an acquisition unit configured to acquire the amount of combustion of the flame, a memory unit configured to store standards for the amount of ultraviolet rays and the amount of combustion, and a determination unit configured to determine the state of the flame by comparing the amount of ultraviolet rays measured by the measurement unit and the amount of combustion acquired by the acquisition unit with the standards.

[0009] In the above-mentioned flame state determination device, the memory unit stores a model showing the relationship between the amount of ultraviolet light and the amount of combustion, and the determination unit determines the state of the flame by comparing the measured amount of ultraviolet light and the amount of combustion obtained by the acquisition unit with the model.

[0010] The flame state determination device includes a model creation unit that creates a model relating to the amount of ultraviolet light and the amount of combustion stored in the memory unit from the amount of ultraviolet light measured by the measurement unit and the amount of combustion acquired by the acquisition unit.

[0011] In the above-mentioned flame state determination device, the memory unit stores a model showing the relationship between the amount of ultraviolet light, the amount of combustion, and the air ratio, and the determination unit estimates the air ratio as the state of the flame by comparing the amount of ultraviolet light measured by the measurement unit and the amount of combustion acquired by the acquisition unit with the model.

[0012] In one example configuration of the above-mentioned flame state determination device, the acquisition unit acquires the air ratio when creating a model, and is equipped with a model creation unit that creates a model showing the relationship between the amount of ultraviolet light, the amount of combustion, and the air ratio stored in the memory unit from the amount of ultraviolet light measured by the measurement unit and the amount of combustion and the air ratio acquired by the acquisition unit.

[0013] In one example configuration of the above-mentioned flame judgment device, the acquisition unit acquires the combustion amount, air temperature, and furnace pressure, the memory unit stores a model showing the relationship between the amount of ultraviolet light, combustion amount, air temperature, furnace pressure, and air ratio, and the judgment unit estimates the air ratio as the state of the flame by comparing the amount of ultraviolet light measured by the measurement unit and the combustion amount, air temperature, and furnace pressure acquired by the acquisition unit with the model.

[0014] In one example configuration of the above-mentioned flame judgment device, the acquisition unit acquires the air ratio when creating a model, and is equipped with a model creation unit that creates a model showing the relationship between the amount of ultraviolet light, the amount of combustion, the air temperature, the furnace pressure, and the air ratio stored in the memory unit from the amount of ultraviolet light measured by the measurement unit and the amount of combustion, the air temperature, and the furnace pressure acquired by the acquisition unit.

[0015] In one configuration example of the above-described flame state determination device, an adjustment unit is provided that is configured to adjust the amount of ultraviolet light generated from the flame and measured by the measurement unit.

[0016] In one example configuration of the above-mentioned flame state determination device, the adjustment unit includes a cylindrical light introduction structure that introduces ultraviolet light to be measured by the measurement unit into the measurement unit, and a field of view adjustment unit configured to adjust the flame monitoring position for introducing ultraviolet light. [Effects of the Invention]

[0017] As described above, according to the present invention, the amount of ultraviolet light measured by the measurement unit and the amount of flame combustion acquired by the acquisition unit are compared with a reference, thereby improving the accuracy of estimating the state of the flame. Furthermore, according to the present invention, the amount of ultraviolet light generated from 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 that is used to monitor the presence or absence of a flame. [Brief explanation of the drawings]

[0018] [Figure 1A] FIG. 1A is a configuration diagram showing the configuration of a flame state determining device according to a first embodiment of the present invention. [Figure 1B] FIG. 1B is a flowchart illustrating an example of the operation of the flame state determining device according to the first embodiment of the present invention. [Figure 2A] FIG. 2A is a configuration diagram showing the configuration of a flame state determining device according to a second embodiment of the present invention. [Figure 2B] FIG. 2B is a flowchart illustrating an example of the operation of the flame state determining device according to the second embodiment of the present invention. [Figure 3A] FIG. 3A is an explanatory diagram for explaining a model created by model creation unit 107 of the flame state determination device according to the first embodiment of the present invention. [Figure 3B] FIG. 3B is an explanatory diagram for explaining a model created by model creation unit 107 of the flame state determination device according to the first embodiment of the present invention. [Figure 3C] FIG. 3C is an explanatory diagram for explaining a model created by model creation unit 107 of the flame state determination device according to the first embodiment of the present invention. [Figure 3D] FIG. 3D is an explanatory diagram for explaining a model created by model creation unit 107 of the flame state determination device according to the first embodiment of the present invention. [Figure 3E]FIG. 3E is an explanatory diagram for explaining determination using a model in determining unit 105 of the flame state determining device according to the first embodiment of the present invention. [Figure 3F] FIG. 3F is an explanatory diagram for explaining determination using a model in determination unit 105 of the flame state determination device according to the first embodiment of the present invention. [Figure 4] FIG. 4 is a diagram showing a partial configuration of another flame state determination device according to an embodiment of the present invention. [Figure 5] FIG. 5 is a configuration diagram showing the hardware configuration of the acquisition unit 103, storage unit 104, determination unit 105, and model creation unit 107 of the flame state determination device according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] The present invention was realized by focusing on the fact that the amount of ultraviolet light and the amount of combustion have a monotonic relationship (mutually monotonic relationship) despite the nonlinear relationship between them, and by adopting a configuration that adopts standards for the amount of ultraviolet light and the amount of combustion.The following describes a flame state determination device according to an embodiment of the present invention.

[0020] [Embodiment 1] First, a flame state determination device according to a first embodiment of the present invention will be described with reference to Fig. 1A. This 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.

[0021] The measuring unit 101 measures ultraviolet rays generated from a flame 131 produced by a combustion device (not shown). The measuring unit 101 can be configured, for example, from an ultraviolet sensor such as an ultraviolet detection tube that detects ultraviolet rays in a predetermined wavelength range. The ultraviolet detection tube is a discharge tube that generates an electric discharge between a pair of electrodes provided inside a glass tube when ultraviolet rays emitted from the flame are incident thereon while a high voltage is applied between the electrodes.

[0022] Adjustment unit 102 adjusts the amount of ultraviolet light generated from flame 131 and measured by measurement unit 101. Adjustment unit 102 can be configured, for example, from an aperture mechanism that narrows down the light, including ultraviolet light, that is generated from flame 131 and reaches measurement unit 101. Furthermore, for example, adjustment unit 102 adjusts the sensitivity of ultraviolet light measured by measurement unit 101, thereby adjusting the amount of ultraviolet light generated from flame 131 and measured by measurement unit 101.

[0023] 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, and operation amount (control valve opening, blower motor frequency or rotation speed, etc.) of a combustion device (not shown). The acquisition unit 103 can also acquire the air temperature and furnace pressure of the combustion device (not shown). The acquisition unit 103 can also arbitrarily acquire the air ratio.

[0024] The memory unit 104 stores standards for the amount of ultraviolet light and the amount of combustion. The memory unit 104 can store a model showing the relationship between the amount of ultraviolet light and the amount of combustion. The memory unit 104 can also store a model showing the relationship between the amount of ultraviolet light, the amount of combustion, and the air ratio (a model for estimating the air ratio) as a standard. The memory unit 104 can also store a model showing the relationship between the amount of ultraviolet light, the amount of combustion, the air ratio, the air temperature, and the pressure inside the furnace (a model for estimating the air ratio). The memory unit 104 also stores, for example, upper and lower limit values for the amount of ultraviolet light for each of a plurality of set combustion amounts as a judgment unit (standard).

[0025] The determination unit 105 determines the state of the flame 131 by comparing the amount of ultraviolet light measured by the measurement unit 101 and the amount of combustion of the flame acquired by the acquisition unit 103 with a reference. For example, the determination unit 105 estimates the air ratio as the state of the flame 131 and sets it as a determination result by applying (comparing) the amount of ultraviolet light measured by the measurement unit 101 and the amount of combustion acquired by the acquisition unit 103 to a reference model stored in the storage unit 104. For example, the determination unit 105 compares the amount of ultraviolet light measured by the measurement unit 101 and the amount of combustion acquired by the acquisition unit 103 with the model, and compares the amount of ultraviolet light with a model showing the relationship between the amount of ultraviolet light and the amount of combustion, a model showing the relationship between the amount of ultraviolet light, the amount of combustion, and the air ratio, and a model showing the relationship between the amount of ultraviolet light, the amount of combustion, the air ratio, the air temperature, and the pressure inside the furnace. For example, the air ratio can be estimated by comparing the amount of ultraviolet light with a model showing the relationship between the amount of ultraviolet light, the amount of combustion, and the air ratio (a model for estimating the air ratio) and a model showing the relationship between the amount of ultraviolet light, the amount of combustion, the air ratio, the air temperature, and the pressure inside the furnace. Furthermore, for example, the determination unit 105 determines whether or not the amount of ultraviolet rays measured by the measurement unit 101 exceeds a reference range defined by the upper and lower limit values of the amount of combustion acquired by the acquisition unit 103. The determination result by the determination unit 105 described above is displayed on the display unit 106.

[0026] Next, an example of the operation of the flame state determination device according to the first embodiment will be described with reference to Fig. 1B. First, in step S101, adjustment unit 102 adjusts the amount of ultraviolet rays generated from flame 131 and measured by measurement unit 101. Next, in step S102, measurement unit 101 acquires the ultraviolet rays, and acquisition unit 103 acquires other flame-related data. Next, in step S103, determination unit 105 estimates the flame state and the air ratio from the model stored in memory unit 104 and the acquired data.

[0027] According to the first embodiment, since memory unit 104 stores standards for the amount of ultraviolet light and the amount of combustion, it becomes possible to compare the amount of ultraviolet light measured by measurement unit 101 and the amount of flame combustion acquired by acquisition unit 103 with the standards. Furthermore, even if measurement unit 101 is installed in a position where it can receive as much ultraviolet light as possible from flame 131, adjustment unit 102 can limit the amount of ultraviolet light measured by measurement unit 101, making it possible to capture changes in the amount of ultraviolet light due to changes in the shape, size, and color of flame 131. As a result, according to the first embodiment, it becomes possible to accurately determine the state of flame 131 using an ultraviolet sensor that is used to monitor the presence or absence of a flame.

[0028] [Embodiment 2] Next, a flame state determination device according to a second embodiment of the present invention will be described with reference to Fig. 2A. Similar to the first embodiment described above, this 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.

[0029] The second embodiment further includes a model creation unit 107. The model creation unit 107 creates standards related to the amount of ultraviolet light and the amount of combustion from the amount of ultraviolet light measured by the measurement unit 101 and the amount of combustion of the flame acquired by the acquisition unit 103. The model creation unit 107 can create the above-mentioned standards using data related to the flame state, such as the amount of ultraviolet light measured by the measurement unit 101, the amount of combustion acquired by the acquisition unit 103, the air ratio, the temperature, and the furnace pressure.

[0030] The model creation unit 107 can create a model that estimates the air ratio as the above-mentioned standard from the amount of ultraviolet light measured by the measurement unit 101 and the combustion amount and air ratio acquired by the acquisition unit 103. The model creation unit 107 can also create a model that estimates the air ratio from the amount of ultraviolet light measured by the measurement unit 101 and the combustion amount, air ratio, air temperature, and furnace pressure acquired by the acquisition unit 103. The standard (model) created by the model creation unit 107 is stored in the memory unit 104. For example, the memory unit 104 can store a model that estimates the air ratio, a standard (model) related to the amount of ultraviolet light and the combustion amount, a model showing the relationship between the amount of ultraviolet light, the combustion amount, and the air ratio, and a model showing the relationship between the amount of ultraviolet light, the combustion amount, the air ratio, the air temperature, and the furnace pressure.

[0031] Next, an example of the operation of the flame state determination device according to embodiment 2 will be described with reference to Fig. 2B. First, in step S101, adjustment unit 102 adjusts the amount of ultraviolet light generated from flame 131 and measured by measurement unit 101.

[0032] Next, in step S104, model creation unit 107 determines whether or not a reference (model) is stored in memory unit 104. If a model is stored in memory unit 104 (yes in step S104), in step S102, measurement unit 101 acquires ultraviolet rays, and acquisition unit 103 acquires other flame-related data. Next, in step S103, determination unit 105 estimates the flame state and the air ratio from the model stored in memory unit 104 and the acquired data.

[0033] On the other hand, if no model is stored in memory unit 104 (no in step S104), in step S105, measurement unit 101 acquires ultraviolet rays, and acquisition unit 103 acquires other flame-related data. Next, in step S106, model creation unit 107 creates a model that estimates the flame state and air ratio from the acquired data. After this, in step S102, measurement unit 101 acquires ultraviolet rays, and acquisition unit 103 acquires other flame-related data. Next, in step S103, determination unit 105 estimates the flame state and air ratio from the model stored in memory unit 104 and the acquired data.

[0034] The model will be described in more detail. For example, the combustion device is operated by changing the air ratio at predetermined intervals (0.2 steps) and changing the combustion amount (the amount of combustion gas supplied to the burner) at each air ratio. The measurement unit 101 measures the change in the amount of ultraviolet light generated from the flame 131 when the combustion device is operated under each condition. Based on the results of these measurements, the model creation unit 107 determines the relationship between the change in the amount of ultraviolet light and the change in the combustion amount for each air ratio. The model creation unit 107 stores the obtained relationship f for each air ratio in the memory unit 104 as a model showing the relationship between the combustion amount, air ratio, and amount of ultraviolet light.

[0035] Using the model created as described above, the measured amount of ultraviolet light and the amount of combustion when this amount of ultraviolet light was measured are applied to each relationship f, and the air ratio can be estimated from the matching relationship f. If the estimated air ratio differs from the normal air ratio, it can be determined that the state of the combustion device (flame 131) is abnormal.

[0036] For example, a model (ultraviolet characteristics of the burner) is obtained in advance as follows and stored in the storage unit 104.

[0037] First, at a certain air ratio (e.g., 0.9), the amount of UV radiation is measured for a certain period of time for each combustion volume (Fig. 3A).The relationship between the combustion volume and the amount of UV radiation at an air ratio of 0.9, v = f(e, r = 0.9), is estimated (Fig. 3B).

[0038] The air ratio is set to 1.1, the amount of UV rays is measured in the same manner as above, and the relationship between the amount of combustion and the amount of UV rays at an air ratio of 1.1, v = f(e,r = 1.1), is estimated (Figure 3C).

[0039] Similar measurements and estimations are carried out for all air ratios (e.g., 0.9, 1.1, 1.3), and the relationship between the combustion volume and the amount of ultraviolet light at an air ratio of 1.3, v = f(e, r = 1.3), is estimated to obtain the ultraviolet light characteristics of the burner (amount of ultraviolet light relative to the air ratio and amount of combustion) (Fig. 3D).

[0040] By using the ultraviolet characteristics of the burner obtained as described above, the determining unit 105 estimates the air ratio during actual operation.

[0041] For example, in a combustion device where the air ratio should be 1.1, if the amount of ultraviolet light measured by the measuring unit 101 at a combustion amount e1 is v1, it can be determined that the relationship v=f(e,r=1.1) for an air ratio of 1.1 is close to normal (Figure 3E).

[0042] In a combustion device where the air ratio should be 1.1 as described above, if the amount of ultraviolet light measured by the measuring unit 101 at a combustion amount e1 after one year becomes v2, it is estimated that the air ratio is close to the relationship v=f(e,r=9) for an air ratio of 0.9, and can be determined to be abnormal (Figure 3F).

[0043] Generally, the measurement unit 101 is housed in a cylindrical light introduction structure 121, as shown in Fig. 4. The light introduction structure 121 has an inlet 122 at one end for introducing ultraviolet light to be measured, and the measurement unit 101 is installed at the other end. The light introduction structure 121 allows ultraviolet light from a flame 131 to be measured by the measurement unit 101 to be selectively introduced into the measurement unit 101. For example, by placing the flame 131 on the optical path connecting the measurement unit 101 and the inlet 122, it becomes possible to selectively measure ultraviolet light emitted from the flame 131.

[0044] Here, by using field of view adjustment unit 123 to shift the position of inlet 122 in a direction intersecting the optical path, the flame monitoring position for introducing ultraviolet light into light introduction structure 121 can be adjusted, thereby changing the field of view measured by measurement unit 101. By changing the field of view measured by measurement unit 101, it becomes possible to take into account the fluctuation and wobble of the flame and the relative position of flame 131 and measurement unit 101, and to more accurately capture changes in the amount of ultraviolet light due to changes in the shape, size, and color of flame 131.

[0045] 5, the acquisition unit 103, storage unit 104, determination unit 105, and model creation unit 107 according to the above-described embodiment can be implemented as a computer device including a CPU (Central Processing Unit) 301, a main storage device 302, an external storage device 303, and a network connection device 304. The network connection device 304 is connected to a network 305. The CPU 301 operates (executes) a program loaded in the main storage device 302 of the computer device, thereby realizing the functions of the acquisition unit 103, storage unit 104, determination unit 105, and model creation unit 107.

[0046] The acquisition unit 103, storage unit 104, determination unit 105, and model creation unit 107 according to the above-described embodiment can also be configured using a programmable logic device (PLD) such as an FPGA (field-programmable gate array). For example, the acquisition unit 103, storage unit 104, determination unit 105, and model creation unit 107 can be provided as circuits in a logic element of an FPGA, thereby functioning as a flame state determination device. Each of the acquisition circuit, storage circuit, determination circuit, and reference creation circuit can be written into the FPGA by connecting a predetermined writing device. Furthermore, each of the above circuits written into the FPGA can be confirmed by the writing device connected to the FPGA.

[0047] As described above, according to the present invention, the adjustment unit adjusts the amount of ultraviolet light generated from the flame and measured by the measurement unit, thereby enabling the state of the flame to be determined using an ultraviolet sensor used to monitor the presence or absence of a flame. The measurement unit that measures ultraviolet light is installed in a position that allows it to receive as much ultraviolet light from the flame as possible. Therefore, when the flame is ignited, the amount of ultraviolet light from the flame exceeds the measurement range of the measurement unit. In this state, the measurement unit cannot detect changes in the amount of ultraviolet light due to changes in the shape, size, and color of the flame. In contrast, by limiting the amount of ultraviolet light measured by the measurement unit using the adjustment unit, it becomes possible to detect changes in the amount of ultraviolet light due to changes in the shape, size, and color of the flame. As a result, the state of the flame can be accurately determined using the ultraviolet measurement unit used to monitor the presence or absence of a flame.

[0048] It should be noted that the present invention is not limited to the embodiments described above, and it is clear that many modifications and combinations can be made by a person having ordinary knowledge in the art within the technical concept of the present invention. [Explanation of symbols]

[0049] 101...Measurement section, 102...Adjustment section, 103...Acquisition section, 104...Storage section, 105...Judgment section, 106...Display section, 131...Flame.

Claims

1. a measuring unit for measuring ultraviolet rays generated from a flame of a combustion device; an acquisition unit configured to acquire a combustion amount of the flame; a storage unit configured to store a reference for the amount of ultraviolet light and the amount of combustion; a determination unit configured to determine the state of the flame by comparing the amount of ultraviolet light measured by the measurement unit and the amount of combustion acquired by the acquisition unit with the reference; A flame state determination device comprising:

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

3. 3. The flame state determination device according to claim 2, A flame state determination device comprising a model creation unit that creates the model regarding the amount of ultraviolet light and the amount of combustion stored in the memory unit from the amount of ultraviolet light measured by the measurement unit and the amount of combustion acquired by the acquisition unit.

4. 3. The flame state determination device according to claim 2, the storage unit stores the model indicating the relationship between the amount of ultraviolet light, the amount of combustion, and the air ratio; The determination unit estimates an air ratio as a flame state by comparing the amount of ultraviolet light measured by the measurement unit and the amount of combustion acquired by the acquisition unit with the model. Flame condition determination device.

5. 5. The flame state determination device according to claim 4, The acquisition unit acquires an air ratio when creating a model, A flame state determination device comprising a model creation unit that creates the model showing the relationship between the amount of ultraviolet light, the amount of combustion, and the air ratio stored in the memory unit based on the amount of ultraviolet light measured by the measurement unit and the amount of combustion and the air ratio acquired by the acquisition unit.

6. 3. The flame state determination device according to claim 2, The acquisition unit acquires the combustion amount, the air temperature, and the furnace pressure, the storage unit stores the model showing the relationship between the amount of ultraviolet light, the amount of combustion, the air temperature, the pressure inside the furnace, and the air ratio; The determination unit estimates the air ratio as the state of the flame by comparing the amount of ultraviolet light measured by the measurement unit and the amount of combustion, air temperature, and furnace pressure acquired by the acquisition unit with the model. Flame condition determination device.

7. 7. The flame state determination device according to claim 6, The acquisition unit acquires an air ratio when creating a model, A flame state determination device comprising a model creation unit that creates the model showing the relationship between the amount of ultraviolet light, combustion amount, air temperature, furnace pressure, and air ratio stored in the memory unit based on the amount of ultraviolet light measured by the measurement unit and the combustion amount, air temperature, and furnace pressure acquired by the acquisition unit. Flame condition determination device.

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

9. The flame state determination device according to claim 8, The adjustment unit a cylindrical light introduction structure that introduces ultraviolet light to be measured by the measurement unit into the measurement unit; a field of view adjustment unit configured to adjust the flame monitoring position for introducing ultraviolet light; A flame state determination device comprising:

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