Temperature measurement method, temperature measurement device, and coke oven

Abstract

To reduce a work load such as temperature measurement and maintenance when measuring the temperature of a combustion chamber of a coke oven.SOLUTION: The temperature of the combustion chamber of the coke oven is measured by using a temperature measuring device equipped with a moving mechanism moving on the upper surface of the coke oven and a two color radiation thermometer provided in the moving mechanism and measuring the temperature of the combustion chamber. At this time, the moving mechanism moves along the oven battery direction in which the carbonization chamber and the combustion chamber of the coke oven are aligned, and the two color radiation thermometer detects radiation light from the combustion chamber through a slit-shaped opening of a flue lid installed in an observation hole at the top of the combustion chamber to measure the temperature of the combustion chamber.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a temperature measuring method for measuring the temperature of a combustion chamber of a coke oven, a temperature measuring device, and a coke oven. [Background technology]

[0002] Coke ovens operate by adjusting the fuel gas supply rate based on the temperature of the combustion chamber. The temperature of the combustion chamber is typically measured using a radiation thermometer through an observation hole called a "flue port" located at the top of the chamber. To measure the temperature of the combustion chamber using a radiation thermometer, an operator removes the flue port cover (hereinafter also referred to as the "flue port cover") that covers the observation hole, looks into the combustion chamber with a handheld radiation thermometer, measures the temperature, and then replaces the flue port cover once the temperature reading is obtained. This measurement requires the operator to directly view the combustion chamber, which is open to the atmosphere, with the radiation thermometer, exposing them to flames and high-temperature hot air from the combustion chamber. Furthermore, since a single coke oven contains approximately 100 combustion chambers, each with approximately 30 flue ports, simply measuring the temperature at the few specific flue ports for each combustion chamber requires a significant amount of work.

[0003] As a method for measuring the temperature of a combustion chamber, for example, Patent Document 1 proposes a method in which an optical window is provided in the flue lid and the temperature of the combustion chamber is measured through the optical window using a two-color radiation thermometer. The method described in Patent Document 1 allows temperature measurement without removing the flue lid. Furthermore, the two-color radiation thermometer detects spectral radiance at two different wavelengths and uses the measurement principle of the ratio of these spectral radiances (two-color ratio) as a function of temperature. This allows for accurate temperature measurement without being affected by dust adhering to the optical window, which reduces the observed radiance, or by a "field of view defect" where part of the field of view of the two-color radiation thermometer falls outside the optical window. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2022-144765 Summary of the Invention [Problem to be solved by the invention]

[0005] In the method described in Patent Document 1, an optical window is provided in the flue lid of the coke oven, allowing the combustion chamber temperature to be measured using a two-color radiation thermometer without removing the flue lid. However, the optical window is exposed to the outdoors and becomes contaminated. When the optical window becomes heavily contaminated, even two-color radiation thermometers that are not susceptible to "field of view defects" may not be able to accurately detect the thermal radiation from the furnace bottom due to factors such as insufficient light intensity. To accurately measure the combustion chamber temperature using a two-color radiation thermometer, it is sufficient to remove the dirt from the optical window, but cleaning all of the optical windows in a coke oven is a heavy burden.

[0006] Therefore, the present invention has been made in consideration of the above problems, and an object of the present invention is to provide a temperature measurement method, a temperature measurement device, and a coke oven for measuring the temperature of the combustion chamber of a coke oven, which can reduce the workload of temperature measurement, maintenance, etc. [Means for solving the problem]

[0007] In order to solve the above problem, according to one aspect of the present invention, there is provided a temperature measurement method for measuring the temperature of a combustion chamber of a coke oven, which uses a temperature measurement device including a moving mechanism that moves along the upper surface of the coke oven and a two-color radiation thermometer that is attached to the moving mechanism and measures the temperature of the combustion chamber, and moves the moving mechanism along the furnace battery direction, which is the direction in which the carbonization chamber and the combustion chamber of the coke oven are aligned, and uses the two-color radiation thermometer to detect radiant light from the combustion chamber through a slit-shaped opening in a flue lid installed in an observation hole at the top of the combustion chamber, thereby measuring the temperature of the combustion chamber.

[0008] The opening of the flue cover may have a longitudinal direction that is aligned with the furnace length direction perpendicular to the furnace battery direction, and the longitudinal length may be set to be greater than or equal to the deviation in the furnace length direction when the moving mechanism is running.

[0009] Furthermore, when the visual field defect rate α of the two-color radiation thermometer is expressed by taking a state in which the visual field of the two-color radiation thermometer is not defective at all as 0 and a state in which the visual field of the two-color radiation thermometer is completely blocked as 1, the length of the opening in the flue cover in the short side direction may be set so that the visual field defect rate α is 0.9 or less.

[0010] The moving mechanism may be a coal car that supplies coal to the coking chamber.

[0011] In addition, in order to solve the above-mentioned problems, according to another aspect of the present invention, there is provided a temperature measuring device for measuring the temperature of a combustion chamber of a coke oven, comprising: a moving mechanism that moves on the upper surface of the coke oven in a furnace battery direction, which is the direction in which the carbonization chamber and the combustion chamber of the coke oven are aligned; and a two-color radiation thermometer that is provided on the moving mechanism and measures the temperature of the combustion chamber, wherein the two-color radiation thermometer detects radiant light from the combustion chamber through a slit-shaped opening provided in an observation hole at the top of the combustion chamber.

[0012] Furthermore, in order to solve the above-mentioned problems, according to another aspect of the present invention, there is provided a coke oven in which a flue lid that seals an observation hole at the top of the combustion chamber of the coke oven is provided with a slit-shaped opening. [Effects of the Invention]

[0013] As described above, according to the present invention, it is possible to reduce the workload of temperature measurement, maintenance, etc. when measuring the temperature of the combustion chamber of a coke oven. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a schematic diagram showing a schematic configuration of a coke oven according to an embodiment of the present invention. [Figure 2] 3 is a schematic diagram showing a state in which the temperature measurement device according to the embodiment measures the temperature of a combustion chamber. FIG. [Figure 3] 1 is a graph showing an example of the relationship between blackbody temperature and dichroic ratio. [Figure 4] FIG. 1 is a schematic diagram showing the relationship between a two-color radiation thermometer and a flue lid installed in an observation hole at the top of a combustion chamber when the temperature measuring device is viewed from above. [Figure 5] FIG. 10 is an explanatory diagram for explaining the relationship between the opening of the flue lid and the measurement field of view of the two-color radiation thermometer. [Figure 6] 1 is a graph showing a relationship between the visual field defect rate α of a two-color radiation thermometer and the variation ΔT of the measured temperature. [Figure 7] 10 is a graph showing a relationship between the slit width W of the opening and the visual field defect rate α, with the diameter Ds of the visual field of the two-color radiation thermometer as a parameter. [Figure 8] 8 is a graph based on FIG. 7 showing the relationship between the diameter Ds of the field of view of a two-color radiation thermometer and the slit width W when the field loss rate α is 0.9. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this specification and drawings, components having substantially the same functional configurations are designated by the same reference numerals, and redundant explanations will be omitted.

[0016] [1. Structure of a coke oven] First, the schematic configuration of a coke oven 1 according to one embodiment of the present invention will be described with reference to Figures 1 and 2. Figure 1 is a schematic diagram showing the schematic configuration of a coke oven 1 according to this embodiment. Figure 2 is a schematic diagram showing the state of temperature measurement of a combustion chamber 20 by a temperature measurement device 50 according to this embodiment.

[0017] A coke oven 1 is a furnace for producing coke. As shown in FIG. 1, in the upper part of the furnace body of the coke oven 1, carbonization chambers 10 and combustion chambers 20 are alternately arranged in the direction of the furnace bed (the furnace width direction, the direction in which the carbonization chambers 10 and combustion chambers 20 are aligned, the Y direction), and a heat regenerator 60 is provided in the lower part. Coke is produced by burning combustion gas preheated in the heat regenerator 60 and combustion air in the combustion chamber 20, and carbonizing coal charged in the carbonization chamber 10 using the generated heat. The coke produced by carbonizing the coal (coke 5 in FIG. 2) is pushed by an extruder (not shown) from the extruder side to the coke discharge side on the opposite side, and is discharged from the carbonization chamber 10.

[0018] At the furnace top 30 on the top surface of each combustion chamber 20, a combustion chamber observation hole (also called a flue port, hereinafter referred to as "observation hole") 35 for checking the combustion state inside the combustion chamber 20 opens vertically, connecting the combustion chamber 20 with the atmospheric space above the coke oven 1. Multiple observation holes 35 are arranged along the furnace length direction (the direction perpendicular to the furnace battery direction, the X direction).

[0019] As shown in Figure 2, each observation hole 35 is provided with a removable flue lid 40 that seals the observation hole 35 to prevent the flame and hot air from the combustion chamber 20 from leaking through the opening of the observation hole 35. Therefore, it is also possible to measure the temperature by opening the flue lid 40 and inserting a thermocouple into the combustion chamber 20. The flue lid 40 according to this embodiment has a slit-shaped, elongated opening 45. By providing the opening 45 in the flue lid 40, it is possible to measure the temperature of the combustion chamber 20 without removing the flue lid 40.

[0020] [2. Measuring the temperature of the combustion chamber using a temperature measuring device] [2-1.Temperature measurement device] Next, a temperature measuring device 50 for measuring the temperature of the combustion chamber 20 of the coke oven 1 will be described with reference to Fig. 2. The temperature measuring device 50 according to this embodiment is a device for measuring the temperature of the combustion chamber 20 of the coke oven. The temperature measuring device 50 measures the temperature of the combustion chamber 20 through an opening 45 in a flue lid 40 installed in an observation hole 35 in the furnace top 30. As shown in Fig. 2, the temperature measuring device 50 includes a moving mechanism 51 for moving over the top surface of the coke oven, and a two-color radiation thermometer 53 for measuring the temperature of the combustion chamber 20.

[0021] (Moving mechanism) The moving mechanism 51 moves along the direction of the oven battery on the top surface of the coke oven 1. The moving mechanism 51 moves the two-color radiation thermometer 53 provided on the moving mechanism 51 by moving on the top surface of the furnace structure outside the coke oven. By moving the two-color radiation thermometer 53 with the moving mechanism 51, it becomes possible to automate the temperature measurement of the combustion chamber 20 of the coke oven 1, thereby reducing the burden on the worker.

[0022] The moving mechanism 51 may be, for example, a coal loading car, which is a moving machine that supplies coal from the top of the coke oven 1 to the coke chamber 10, or may be a moving carriage for the temperature measuring device 50. The moving mechanism 51 moves, for example, on a rail laid on the top surface of the coke oven 1 along the direction of the oven battery. This allows the temperatures of all combustion chambers 20 of the coke oven 1 to be easily measured by the two-color radiation thermometer 53 installed on the moving mechanism 51.

[0023] (Two-color radiation thermometer) The two-color radiation thermometer 53 is a thermometer that measures the temperature of the combustion chamber 20. Specifically, the two-color radiation thermometer 53 is a temperature measurement device that uses two-color radiation thermometry, which detects the spectral radiance of thermal radiation at two different wavelengths and uses the measurement principle that the ratio of these spectral radiances (two-color ratio) changes depending on the temperature.

[0024] Radiation thermometry is a method of measuring the temperature of an object without contact, utilizing the phenomenon that the thermal radiance increases as the temperature of the object rises, and is widely used in the scientific and industrial fields. A typical radiation thermometer that detects the thermal radiance (intensity of radiated light) at a certain wavelength of light is strictly called a "monochromatic radiation thermometer."

[0025] In contrast, two-color radiation thermometry is a method for measuring the temperature of an object without contacting it, utilizing the fact that the wavelength distribution of thermal radiation changes as the temperature of the object increases. A two-color radiation thermometer 53 that measures temperature based on two-color radiation thermometry determines the temperature T of the object from the ratio of the spectral radiances L1 and L2 of the two wavelengths λ1 and λ2. The spectral radiances L1 and L2 of the two observed wavelengths λ1 and λ2 are expressed by the Wien approximation formula for blackbody radiation, as shown in the following equations (1) and (2):

[0026]

number

[0027] Here, τ1 is the spectral transmittance at wavelength λ1 along the optical path from the measurement object to the two-color radiation thermometer 53, τ2 is the spectral transmittance at wavelength λ2 along the optical path from the measurement object to the two-color radiation thermometer 53, and c1 and c2 are the first and second constants of blackbody radiation, respectively. Note that in general radiation thermometry, the emissivity of the measurement object is an issue, but in measuring the temperature of the combustion chamber 20 of the coke oven 1, the combustion chamber 20 is a cavity with a uniform temperature, so it can be considered a pseudo-blackbody (emissivity = 1) regardless of wavelength. Furthermore, the wavelengths λ1 and λ2 take on fixed values ​​for each two-color radiation thermometer.

[0028] If the spectral transmittances at the two wavelengths λ1 and λ2 are equal (i.e., τ1 = τ2 = τ), the dichroic ratio R, which is the ratio between the above equations (1) and (2), is expressed as the following equation (3).

[0029]

number

[0030] In the above formula (3), R λ Since λ and Λ are constants determined by the detection wavelength, the dichroic ratio R is a function of only the temperature T. Therefore, if the dichroic ratio R can be obtained, the temperature T of the object to be measured can be determined. As an example, Figure 3 shows the relationship between the temperature T and the dichroic ratio R calculated using the above formula (3) with λ1 = 1350 nm and λ2 = 1550 nm. As shown in Figure 3, the dichroic ratio R increases monotonically with temperature T.

[0031] In this way, with the two-color radiation thermometer 53, it is not necessary to measure the absolute value of the intensity of thermal radiance; the temperature T of the object can be determined as long as the two-color ratio R can be obtained. With a monochromatic radiation thermometer, the temperature of the object is determined based on the absolute value of the detected thermal radiance, so if the observation light weakens due to disturbances, the measured temperature will also decrease. In contrast, the two-color radiation thermometer 53 can measure the temperature without being affected by light attenuation, because the two-color ratio R does not change even if the observation light weakens.

[0032] [2-2. Temperature measurement method] In the temperature measurement method for measuring the temperature of the combustion chamber 20 of the coke oven 1 according to this embodiment, the two-color radiation thermometer 53 measures the temperature of the combustion chamber 20 at a predetermined timing as the moving mechanism 51 carrying the two-color radiation thermometer 53 moves toward the furnace battery. The two-color radiation thermometer 53 detects radiant light from the combustion chamber 20 through the opening 45 of the flue lid 40 installed in the observation hole 35 at the top of the combustion chamber 20, and measures the temperature of the combustion chamber 20.

[0033] The temperature measuring device 50 then outputs the temperature measured by the two-color radiation thermometer 53 and the position of the moving mechanism 51 at the time of temperature measurement to an external terminal (not shown). The terminal is an information processing terminal such as a computer, and may be, for example, a monitoring terminal used by an operator operating the coke oven 1 to monitor the combustion state of the combustion chamber 20. The terminal records in a memory unit the temperature of the combustion chamber 20 measured by the two-color radiation thermometer 53 in association with the furnace number assigned to the combustion chamber 20 whose temperature is to be measured, which is identified from the position of the moving mechanism 51. The terminal may also display the furnace number of the combustion chamber 20 whose temperature is to be measured and the measured temperature on a display unit.

[0034] The temperature measurement method according to this embodiment will be described in more detail with reference to Fig. 4. Fig. 4 is a schematic diagram showing the relationship between the two-color radiation thermometer 53 and the flue lid 40 installed in the observation hole 35 at the top of the combustion chamber 20 when the temperature measurement device 50 is viewed from above.

[0035] The moving mechanism 51 of the temperature measuring device 50 according to this embodiment travels on wheels 52 on a pair of rails 70 laid on a coke oven along the direction of the oven battery, like a coal-loading car. The two-color radiation thermometer 53 is provided on the moving mechanism 51 so that, as the moving mechanism 51 travels, it passes above each flue lid 40 provided at a predetermined interval in the direction of the oven battery corresponding to the combustion chamber 20. For example, as shown in FIG. 4 , when a flue lid 40 is provided at the center of the pair of rails 70 in the oven length direction, the two-color radiation thermometer 53 is installed in the center between the wheels 52 in the width direction of the moving mechanism 51 (which corresponds to the oven length direction when the moving mechanism 51 is on the rails 70). This allows the two-color radiation thermometer 53 to pass above the flue lid 40 as the moving mechanism 51 travels on the rails 70.

[0036] As described above, the flue lid 40 of the coke oven 1 according to this embodiment is provided with a slit-shaped elongated opening 45. By providing the opening 45 in the flue lid 40, the temperature of the combustion chamber 20 can be measured without removing the flue lid 40.

[0037] The flue observation hole 35 is covered with a flue cover 40 because there is a pressure difference between inside and outside the furnace. Each combustion chamber 20 of the coke oven 1 has an even number of flues, and they operate by switching at predetermined intervals between flues that supply combustion gas from the regenerator 60 (combustion-side flues) and flues that discharge exhaust gas to the regenerator 60 (exhaust-side flues). The pressure inside the furnace for the combustion-side flues is positive relative to the atmosphere, while the exhaust-side flues are negative. For this reason, when the observation hole 35 is open, high-temperature combustion gas flows out of the furnace through the combustion-side flues, and atmospheric air is drawn into the furnace through the exhaust-side flues. In either case, the combustion efficiency of the coke oven 1 is reduced.

[0038] However, when the observation hole 35 is only slightly open, the inflow and outflow of air due to pressure loss is significantly suppressed compared to when the observation hole 35 is completely open, and the impact on combustion efficiency is small. Therefore, by providing a slit-shaped, elongated opening 45 in the flue lid 40, the two-color radiation thermometer 53 can measure the temperature of the combustion chamber 20 through the opening 45 without removing the flue lid 40 from the observation hole 35. Note that because the opening 45 in the flue lid 40 is slit-shaped, a portion of the measurement field of the two-color radiation thermometer 53 will fall outside the opening 45, resulting in a loss of field of view. However, the two-color radiation thermometer 53 can obtain the temperature of the object to be measured as long as the two-color ratio can be obtained, and because the two-color ratio does not change even when the observation light is weakened, the temperature of the combustion chamber 20 can be measured without being affected by light attenuation.

[0039] The relationship between the size of the opening 45 of the flue lid 40 and the temperature measurement by the two-color radiation thermometer 53 will be explained in more detail below with reference to Fig. 5. Fig. 5 is an explanatory diagram for explaining the relationship between the opening 45 of the flue lid 40 and the measurement field of view of the two-color radiation thermometer 53.

[0040] (A) Slit length The flue lid 40 is, for example, a disc-shaped part made of iron, and is provided with a slit-shaped opening 45 as shown in Fig. 5. Hereinafter, the length of the opening 45 in the longitudinal direction will also be referred to as the slit length L, and the length in the lateral direction will also be referred to as the slit width W. Note that the shape of the opening 45 is a long, narrow rectangle, but the four corners of the opening 45 may be right angles or may be curved as shown in Fig. 5.

[0041] The opening 45 is preferably provided so that its longitudinal direction is along the furnace length direction, and more preferably parallel to the furnace length direction. As shown in FIG. 4, when the moving mechanism 51 travels on the rail 70, it moves while slightly displacing left and right relative to the direction of travel (i.e., meandering) due to play between the wheels 52 of the moving mechanism 51 and the rail 70, deformation of the rail 70, and the like. For this reason, even if the field of view S of the two-color radiation thermometer 53 is adjusted to pass through approximately the center of the flue lid 40, the meandering of the moving mechanism 51 may cause the two-color radiation thermometer 53 to not pass through the center of some flue lids 40. If the field of view S of the two-color radiation thermometer 53 is completely out of alignment with the opening 45 of the flue lid 40, the two-color radiation thermometer 53 will be unable to measure the temperature of the combustion chamber 20.

[0042] Therefore, by making the opening 45 long in the furnace length direction, even if the moving mechanism 51 meanders, part of the field of view S of the two-color radiation thermometer 53 overlaps with the opening 45. This allows the two-color radiation thermometer 53 to reliably measure the temperature of the combustion chamber 20. For this reason, it is preferable to set the slit length L of the opening 45 to be equal to or greater than the deviation width in the furnace length direction when the moving mechanism 51 travels (i.e., the width by which the moving mechanism 51 may displace left or right relative to the direction of travel). By setting the slit length L to be equal to or greater than the deviation width of the moving mechanism 51, part of the field of view S of the two-color radiation thermometer 53 can overlap with the opening 45 even if the moving mechanism 51 meanders.

[0043] If the meandering of the moving mechanism 51 is small, the slit length L of the opening 45 can be shortened, which is preferable because it allows the opening area of ​​the opening 45 to be reduced. For example, when the diameter D of the observation hole 35 is 100 mm, the slit length L of the opening 45 may be approximately 80 mm. In this case, if the meandering of the moving mechanism 51 is small, the slit length L of the opening 45 can be made smaller than 80 mm.

[0044] (B) Slit width The slit width W of the opening 45, taking into consideration the slit length L, is desirably set so that the ratio of the opening area of ​​the opening 45 to the opening area of ​​the observation hole 35 (hereinafter also referred to as the aperture ratio) is 4% or less. If the aperture ratio is 4% or less, the amount of atmospheric air flowing in and out of the furnace due to pressure loss is small and tolerable. For example, if the diameter D of the observation hole 35 is 100 mm and the slit length L of the opening 45 is 80 mm, an aperture ratio of 4% corresponds to a slit width W of 4 mm. In this case, the slit width W of the opening 45 should be set to 4 mm or less. To further suppress the flow of atmospheric air in and out, it is desirably set to 2 mm (aperture ratio 2%), and even more desirably set to 1 mm (aperture ratio 1%).

[0045] The two-color radiation thermometer 53 generally has a circular field of view S with a diameter Ds of about 4 to 10 mm, although this depends on the optical system and observation distance of the two-color radiation thermometer 53. Therefore, if the slit width W of the opening 45 is less than 4 mm, the field of view S will not be filled with the object to be measured, resulting in a so-called "field of view defect." However, with the two-color radiation thermometer 53, temperature measurement can be performed without being affected by the field of view defect.

[0046] Here, the two-color radiation thermometer 53, whose measurement principle is to determine temperature from the ratio of the spectral radiance of two detection wavelengths (two-color ratio), theoretically has no effect on temperature measurement no matter how much the observation light is reduced due to a defect in the field of view, but in reality, if there is an extreme reduction in the amount of light, the output of the infrared detection element becomes unstable and the temperature measurement accuracy decreases. It is desirable to make the opening 45 of the flue cover 40 as small as possible, but it is thought that there is a minimum value for the slit width W of the opening 45 that can maintain temperature measurement accuracy, corresponding to the size of the field of view S of the two-color radiation thermometer 53.

[0047] Therefore, the inventors of the present application conducted an experimental investigation into the tolerable extent of visual field defects of the two-color radiation thermometer 53. The results are shown in FIG. 6. FIG. 6 shows the relationship between the visual field defect rate α of the two-color radiation thermometer 53 and the variation ΔT of the measured temperature. The visual field defect rate α of the two-color radiation thermometer 53 is an index expressed between 0 and 1, with 0 representing a state in which the visual field of the two-color radiation thermometer 53 is not defective at all and 1 representing a state in which the visual field of the two-color radiation thermometer 53 is completely blocked. The temperature variation ΔT is the standard deviation of the variation in the temperature measurement values ​​when measuring the temperature multiple times with the same visual field defect rate α, and represents the uncertainty of the temperature measurement.

[0048] As shown in Figure 6, the temperature variation ΔT in the temperature values ​​measured by the two-color radiation thermometer 53 increases when the field defect rate α exceeds approximately 0.6, and the temperature measurement accuracy deteriorates rapidly when the field defect rate α exceeds 0.8. The temperature measurement accuracy required for combustion control of the coke oven 1 is approximately ±5°C. To maintain the required temperature measurement accuracy, the field defect rate α should be kept below 0.9.

[0049] FIG. 7 shows the relationship between the slit width W of the opening 45 and the field of view deficiency rate α, with the diameter Ds of the field of view S of the two-color radiation thermometer 53 as a parameter. In terms of coke oven 1 operation, a smaller slit width W of the opening 45 is preferable because it reduces the amount of combustion gas outflow and air inflow. However, as explained with reference to FIG. 6, to maintain temperature measurement accuracy, the field of view deficiency rate α must be 0.9 or less. Based on FIG. 7, the relationship between the diameter Ds of the field of view S of the two-color radiation thermometer 53 and the slit width W, which results in a field of view deficiency rate α of 0.9, can be determined as shown in FIG. 8. From FIG. 8, for example, when the diameter Ds of the field of view S of the two-color radiation thermometer 53 is 10 mm, the temperature measurement accuracy can be maintained by setting the slit width W of the opening 45 of the flue cover 40 to 0.8 mm or more.

[0050] (C) Sampling period The time interval (sampling period) at which the two-color radiation thermometer 53 measures the temperature is set so that at least a portion of the field of view S of the two-color radiation thermometer 53 during temperature measurement overlaps with the opening 45 of the flue lid 40. The circles (S1 to S5) shown by dashed lines in FIG. 5 indicate the position of the field of view S of the two-color radiation thermometer 53 during each temperature measurement during a certain sampling period. By overlapping a portion of the field of view S of the two-color radiation thermometer 53 with the opening 45 of the flue lid 40, as in circle S3, the temperature of the combustion chamber 20 can be measured through the opening 45.

[0051] For example, if the slit width W of the opening 45 is 4 mm, the diameter Ds of the field of view S of the two-color radiation thermometer 53 is 10 mm, and the travel speed of the moving mechanism 51 is 300 mm / s, and the sampling period is set to 10 ms, the measurement distance interval will be 3 mm. In this case, at least a portion of the field of view S of the two-color radiation thermometer 53 overlaps with the opening 45 during at least three temperature measurements. One of these temperature measurements can be performed when the center P of the field of view S of the two-color radiation thermometer 53 is located near the center of the slit width W.

[0052] The temperature measurement method according to this embodiment has been described above. According to this embodiment, a slit-shaped, elongated opening 45 is provided in the flue lid 40 of the coke oven 1. By providing the opening 45 in the flue lid 40, it becomes possible to measure the temperature of the combustion chamber 20 without removing the flue lid 40. In addition, cleaning of the flue lid 40 is not required. Therefore, the workload of temperature measurement, maintenance, etc. when measuring the temperature of the combustion chamber of a coke oven can be reduced.

[0053] Although the preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to these examples. It is clear that a person skilled in the art to which the present invention pertains can conceive of various modifications and alterations within the scope of the technical ideas set forth in the claims, and it is understood that these also naturally fall within the technical scope of the present invention. [Explanation of symbols]

[0054] 1. Coke oven 5. Coke 10 Carbonization chamber 20 Combustion chamber 30 Furnace top 35 Observation hole (Fluport) 40 Flue Lid 45 Opening 50 Temperature measuring device 51 Moving mechanism 52 wheels 53 Two-color radiation thermometer 60 Heat storage chamber 70 Rail S field of view

Claims

1. A temperature measurement method for measuring the temperature of a combustion chamber of a coke oven, comprising: a moving mechanism for moving the upper surface of the coke oven; a two-color radiation thermometer provided on the moving mechanism for measuring the temperature of the combustion chamber; Using a temperature measuring device comprising: The moving mechanism is moved along a furnace battery direction, which is a direction in which the carbonization chamber and the combustion chamber of the coke oven are aligned, a temperature measuring method in which the two-color radiation thermometer detects radiant light from the combustion chamber through a slit-shaped opening in a flue lid installed in an observation hole at the top of the combustion chamber, and measures the temperature of the combustion chamber.

2. The opening of the flue lid is The longitudinal direction of the opening is along the furnace length direction perpendicular to the furnace battery direction, 2. The temperature measuring method according to claim 1, wherein the length in the longitudinal direction is set to be equal to or greater than a deviation width in the furnace longitudinal direction when the moving mechanism travels.

3. When the state in which the field of view of the two-color radiation thermometer is not obstructed at all is defined as 0 and the state in which the field of view of the two-color radiation thermometer is completely obstructed is defined as 1, the field of view obstruction rate α of the two-color radiation thermometer is expressed as follows:

3. The temperature measuring method according to claim 1, wherein the length of the opening in the flue lid in the short direction is set so that the visual field defect rate α is 0.9 or less.

4. 3. The temperature measuring method according to claim 1, wherein the moving mechanism is a coal car that supplies coal to the coking chamber.

5. A temperature measuring device for measuring the temperature of a combustion chamber of a coke oven, a moving mechanism that moves along the upper surface of the coke oven in a direction of the oven battery, which is a direction in which the carbonization chamber and the combustion chamber of the coke oven are aligned; a two-color radiation thermometer provided on the moving mechanism for measuring the temperature of the combustion chamber; Equipped with The two-color radiation thermometer is a temperature measuring device that detects radiant light from the combustion chamber through a slit-shaped opening provided in an observation hole at the top of the combustion chamber.

6. A coke oven in which a slit-shaped opening is provided in the flue cover that seals the observation hole at the top of the combustion chamber of the coke oven.

Images