JP6981028B2 - Inside temperature measurement method and inside monitoring system - Google Patents

Description

The present invention relates to a furnace temperature measuring method and a furnace monitoring system.

In general, a cement firing furnace (cement rotary kiln) provided in a cement manufacturing facility needs to measure the temperature of a heated object in order to control the operation and the degree of firing of the heated object such as clinker. In the temperature measurement of the object to be heated in a furnace having a high dust concentration such as a cement firing furnace and performing continuous treatment, a radiation thermometer capable of measuring the temperature without contact is used.

However, with a radiation thermometer, if there is dust between the object to be measured and the observer, the attenuation of the synchrotron radiation by the dust and the synchrotron radiation from the dust itself will affect the temperature of the object to be heated accurately. There is a problem that it cannot be measured.

The above-mentioned problem related to temperature measurement in a furnace having a high dust concentration can naturally occur in a firing furnace other than the cement firing furnace. In order to solve such a problem, for example, a temperature measuring method capable of reliably measuring the liquid level temperature of molten slag in a furnace having a high soot concentration has been proposed (see, for example, Patent Document 1). ..
In the method proposed in Patent Document 1, among the radiant light radiated from the liquid surface of the molten slag contained in the furnace, the radiant light in the mid-infrared region or the far-infrared region is focused on the photoelectric element. An output voltage having an amplitude corresponding to the intensity of the incident radiant light is generated from the photoelectric element, and the liquid level temperature of the molten slag is determined from this output voltage value and Planck's radiation law. Further, in this temperature measuring method, synchrotron radiation having two or more different wavelengths is used.

Japanese Unexamined Patent Publication No. 2001-249049

In the method proposed in Patent Document 1, the particle size of the target dust is 1 to 2 μm, which is very fine as compared with the dust in a cement firing furnace or the like. Therefore, the method cannot be directly applied to dust in a cement firing furnace or the like and used for temperature measurement of clinker or the like.

In the cement firing furnace, the temperature measurement using a radiation thermometer measures only one point in the vicinity where the maximum temperature on the outlet side of the cement firing furnace is reached. .. Further, since the operation management of the cement firing furnace is performed by relying on the temperature of one point measured in the furnace, it cannot be said that the operation management is sufficient. If the operation control is not sufficient, if it occurs for some reason, the operation to stabilize the operation of the cement firing furnace will be delayed due to the delay in the detection of the temperature fluctuation in the furnace, so it will take time to recover from the unstable situation. This makes it difficult to maintain the degree of firing (quality) of the clinker.

Therefore, in view of the above problems, it is an object of the present invention to provide a furnace temperature measuring method and a furnace monitoring system capable of accurately measuring the temperature of a heated object in a high temperature state.

The present invention provides the following.
[1] A method for measuring the temperature inside a cement firing furnace having a length of L (m) and an outer diameter of D (m) , wherein a thermoelectric thermometer having a protective tube is used for the cement firing furnace with respect to the D. the ratio of the length from the outlet end is disposed at a position of 8 to 15, the furnace temperature measuring method of measuring the temperature of the heated object of the cement burning furnace.
[2] The method for measuring the temperature inside the furnace according to [1], wherein the thermocouple thermometers are provided at the same distance from the outlet end of the cement firing furnace in the circumferential direction of the cement firing furnace.
[3] Refractory bricks are provided on the inner wall of the cement firing furnace, and the refractory bricks are fixed in position by a brick retaining iron plate that is divided into a plurality of pieces in the circumferential direction of the cement firing furnace and mounted and fixed to the inner wall. The method for measuring the temperature inside the furnace according to [1] or [2], wherein the thermoelectric pair thermometer is inserted into the cement firing furnace from between the divided brick refractory plates.
[4] The outer diameter of the protective tube is D _t (mm), and the insertion distance L _t (mm) of the thermocouple thermometer is such that the tip of the protective tube is from the inner surface of the cement firing furnace of the refractory bricks. The method for measuring the temperature inside the furnace in [3], which produces _{2D t or more.}
[5] The method for measuring the temperature inside the furnace according to any one of [1] to [4], wherein the material of the protective tube is at least one selected from SUS310s, cantal, inconel, and silicon nitride.
[6] The outer diameter of the protective tube is D _t (mm) and the inner diameter is _dt (mm), and the thickness of the protective tube _{satisfies (D t} −d _t ) / 2 ≧ 6 [1]. ~ [5] Any one of the furnace temperature measuring methods.
[7] An in-core monitoring system for a cement firing furnace having a length of L (m) and an outer diameter of D (m), and the ratio of the length from the outlet end of the cement firing furnace to D is 8 A temperature measuring device that detects the temperature data in the cement firing furnace by a thermoelectric thermometer arranged at the position of 15 or less and having a protective tube, and a temperature measuring device that receives the temperature data and is heated in the cement firing furnace. An in-core monitoring system equipped with a control device for monitoring the material temperature and firing state of an object.

According to the present invention, it is possible to provide a furnace temperature measuring method and a furnace monitoring system that can accurately measure the temperature of a heated object in a high temperature state.

It is a block diagram of the cement firing furnace and the apparatus related to the cement firing furnace. It is a schematic block diagram of a temperature measuring device. It is a schematic cross-sectional view in the circumferential direction of a cement firing furnace in which a thermocouple thermometer is arranged. It is a schematic diagram which shows that the thermocouple thermometer arranged in the circumferential direction of a rotating cement firing furnace measures the temperature of the object to be heated in order. It is a schematic cross-sectional view in the rotation axis direction of a cement firing furnace in which a thermocouple thermometer is arranged. It is a schematic cross-sectional view which shows the thermocouple thermometer.

[Cement firing furnace]
Hereinafter, the cement firing furnace according to the embodiment of the present invention will be described with reference to FIG.
The raw material charging device 10 controls the feeding amount of the raw material 11 charged from the inlet end of the cement firing furnace 20 via the raw material charging unit 12. The raw material charging device 10 passes through a preheating device (not shown), and controls, for example, to put the raw material 11 having a temperature of 800 ° C. or higher and 900 ° C. or lower into the cement firing furnace 20.
The cement firing furnace 20 burns the raw material 11 input from the raw material input unit 12 while rotating by the kiln burner 22 whose output and the like are controlled by the combustion device 21, and fires a heated object such as a clinker. The firing in the cement firing furnace 20 is performed by a kiln burner 22 that injects the supplied main fuel in a ring shape together with the gas. The fired object to be heated is discharged from the outlet end of the cement firing furnace 20 and enters the cooler 13. The cooler 13 is an air quenching cooler (clinker cooler), and rapidly cools the fired raw material 11 using air.
The temperature measuring device 30 includes a thermocouple thermometer 31 that measures the temperature of the object to be heated at the time of firing. The temperature measuring device 30 transmits the temperature measured by the thermocouple thermometer 31 as temperature data to the control device 50. In the temperature measuring device 30, for example, as shown in FIG. 2, the wireless transmission unit 33 that has received the temperature data measured by the plurality of thermocouple thermometers 31 can wirelessly transmit the temperature data to the control device 50. The thermocouple thermometer 31 and the wireless transmitter 33 obtain power for operation from the battery 34.
The firing furnace drive control device 40 controls the driving of the cement firing furnace 20.
The control device 50 monitors the material temperature and the firing state based on the received temperature data. Further, the control device 50 transmits and controls the amount of raw material sent into the kiln to be charged into the cement firing furnace 20 to the raw material charging device 10 based on the received temperature data, and burns the firing furnace power and the firing furnace coal burning amount. It is transmitted to the device 21 and controlled.
The input device 60 inputs the setting of the operating conditions of the cement firing furnace 20 and transmits the setting to the control device 50.

[Foil temperature measurement method]
The method for measuring the temperature inside the furnace according to the embodiment of the present invention is the method for measuring the temperature inside the cement firing furnace 20 having a length of L (m) and an outer diameter of D (m). In the method for measuring the temperature inside the furnace according to the embodiment of the present invention, the cement firing furnace is arranged at a position where the L / D is 5 or more and 15 or less from the outlet end of the cement firing furnace 20 and has a thermocouple thermometer 31 having a protective tube. The temperature of the object to be heated in 20 is measured.

The cement firing furnace 20 has a cylindrical shape having a length L of 60 m or more and 100 m or less and an outer diameter D of 4 m or more and 6 m or less. The cement firing furnace 20 rotates at a speed of 2 to 3 times per minute.
The cement firing furnace 20 includes a temporary firing zone 201, a desorption zone 202, a firing zone 203, and a cooling zone 204 from the inlet end.

The cement firing furnace 20 is provided with a thermocouple thermometer 31 that measures the temperature of the object to be heated during firing. The thermocouple thermometer 31 is arranged at a position where the L / D (length / outer diameter) is 8 or more and 15 or less from the outlet end of the cement firing furnace 20. If the L / D is less than 8, coaching may adhere to and grow on the surface of the cement firing furnace 20, and the tip of the thermocouple thermometer 31 may be buried and measurement may not be possible. If the L / D exceeds 15, the temperature of the object to be heated at the time of firing cannot be measured prior to the calcined body 201 of the cement firing furnace 20. The thermocouple thermometer 31 has an L / D of 9 or more and 15 or less from the outlet end of the cement firing furnace 20 from the viewpoint that the surface of the cement firing furnace 20 is less coated and the temperature of the object to be heated can be accurately measured. It is preferable, it is more preferably 10 or more and 15 or less, and further preferably 11 or more and 15 or less. Incidentally, the boundary between the temporary firing zone 201 and the desorption zone 202 has an L / D of about 8, and the boundary between the desorption zone 202 and the firing zone 203 has an L / D of about 5.

As shown in FIG. 3, it is preferable that a plurality of thermocouple thermometers 31 are provided at the same distance from the outlet end of the cement firing furnace 20 in the circumferential direction of the cement firing furnace 20. In FIG. 3, four thermocouple thermometers 31A to 31D are shown, but the number is not limited to four.
Since a plurality of thermocouple thermometers 31 are provided in the circumferential direction of the cement baking furnace 20, as shown in FIG. 4, the thermocouple thermometers 31A to 31D are sequentially covered by the rotation of the cement baking furnace 20. The raw material temperature can be directly measured in contact with the heated material (raw material 11).

As shown in FIG. 5, refractory bricks 25 are provided on the inner wall (shell surface 26) of the cement firing furnace 20. The refractory bricks 25 are fixed in position by a brick stop iron plate 23 which is divided into a plurality of pieces in the circumferential direction of the cement firing furnace 20 and mounted and fixed to the inner wall. The thermocouple thermometer 31 is preferably inserted into the cement firing furnace 20 from between the divided brick stop iron plates 23. By inserting the thermoelectric anti-thermometer 31 into the cement firing furnace 20 from between the divided brick stop iron plates 23, the cement firing furnace 20 is damaged due to being rubbed by the refractory bricks 25 due to the deformation of the shell surface 26 during rotation. , And damage to which a load is applied due to the movement of the refractory brick 25 can be prevented.
As shown in FIGS. 3 and 4, when the brick stop iron plate 23 is divided into four in the circumferential direction of the cement firing furnace 20, the thermocouple thermometer 31 is 4 from between the divided brick stop iron plates 23. This is inserted. That is, it is preferable to insert the number of thermocouple thermometers 31 according to the number of divisions of the brick stop iron plate 23.
As shown in FIG. 5, the space between the divided brick retaining iron plates 23 is filled with the castable refractory material 24. The refractory material 24 covers the tip end side of the inserted thermocouple thermometer 31 and imparts fire resistance and impact resistance to the thermocouple thermometer 31.

As shown in FIG. 6, the thermocouple thermometer 31 has a protective tube 32 having _{an outer diameter of D t} (mm) and an inner diameter of _{dt (mm).}
The outer diameter D _t (mm) of the protective tube 32 is preferably 10 mm or more and 30 mm or less, more preferably 12 mm or more and 25 mm or less, and more preferably 14 mm, from the viewpoint of durability and handleability of the thermocouple thermometer 31. It is more preferably 20 mm or less.
The inner diameter _dt (mm) of the protective tube 32 is preferably 3 mm or more and 12 mm or less, and more preferably 4 mm or more and 10 mm or less, from the viewpoint of easy accommodation of the thermocouple and responsiveness of temperature measurement. It is more preferably 5 mm or more and 8 mm or less.
The thickness of the protective tube 32, heat resistance, corrosion resistance viewpoint by impact resistance and the combustion gases, as well as from the viewpoint of responsiveness of the thermometer side, preferably satisfies _{(D t -d t) / 2} ≧ 6, It is more preferable to satisfy 6 ≦ (D _t −d _t ) / 2 ≦ 10, and it is further preferable to satisfy 6 ≦ (D _t −d _t ) / 2 ≦ 8.

The insertion distance L _t (mm) of the thermocouple thermometer 31 is the refractory brick 25 from the viewpoint of accurately measuring the temperature of the object to be heated (raw material 11) and from the viewpoint of heat resistance, impact resistance and corrosion resistance due to combustion gas. it is preferable that the tip of the protective tube 32 from a cement burning furnace interior side surface exits or 2D _t, it is more preferable to leaving or 2.5D _t, it is further preferred that exits more than 3.0D _t.

The material of the protective tube 32 is preferably at least one selected from SUS310s, cantal, inconel and silicon nitride from the viewpoint of heat resistance, impact resistance, oxidation resistance and corrosion resistance due to combustion gas. The material of the protective tube 32 is at least one selected from SUS310s, cantal and inconel, which are made of metal, from the viewpoint of excellent impact durability at the time of contact with the object to be heated (raw material 11) and coaching in addition to heat resistance. It is more preferable to have.

[In-furnace monitoring system]
The in-core monitoring system according to the embodiment of the present invention is an in-core monitoring system for a cement firing furnace 20 having a length of L (m) and an outer diameter of D (m). The in-furnace monitoring system according to the embodiment of the present invention is arranged at a position where the L / D is 5 or more and 15 or less from the outlet end of the cement firing furnace 20, and is provided by a thermoelectric thermometer 31 having a protective tube. A temperature measuring device 30 for detecting the temperature data in the 20 and a control device 50 for receiving the temperature data and monitoring the material temperature and the firing state of the object to be heated in the cement baking furnace 20 are provided.

According to the in-core monitoring system of the present invention, the raw material temperature can be directly measured by the thermocouple thermometer 31 inserted at a position where the L / D is 5 or more and 15 or less from the outlet end of the cement firing furnace 20. , It is possible to grasp the accurate raw material temperature. By grasping the accurate raw material temperature, it is possible to sufficiently manage the operation of the cement firing furnace and stabilize the operation of the cement firing furnace. In addition, the degree of clinker firing (quality) can be maintained by grasping the accurate raw material temperature.
According to the in-furnace monitoring system of the present invention, the raw material temperature is continuously measured, and if the temperature fluctuates, the clinker temperature at the outlet end is made more constant by adjusting the kiln burner or the like in advance. It is possible to keep the clinker firing degree more stable.

Hereinafter, the present invention will be specifically described with reference to Examples, but the present invention is not limited to these Examples.

[Material of protective tube]
As the material of the protective tube, SUS310s, cantal, inconel, and silicon nitride, which are excellent in these performances, were selected from the viewpoints of heat resistance, impact resistance, oxidation resistance, and corrosion resistance due to combustion gas. Since the cement firing furnace is a rotary furnace, the impact force when the raw materials and coaching scraped up due to rotation fall is extremely large, so the impact resistance is the highest among the impact resistance, oxidation resistance, and corrosion resistance. Select the material with importance. Impact resistance is related to the toughness of the material and generally does not tend to match hardness.

<Heat resistance>
From the material property information, "◎" is for the maximum heat resistance temperature of 1,500 ° C or higher, "○" is for less than 1,500 ° C and 1,200 ° C or higher, and 1,000 ° C or higher is less than 1,200 ° C. Those with a temperature of less than 1,000 ° C. were designated as “Δ”, and those with a temperature of less than 1,000 ° C. were designated as “×”.

<Hardness>
The hardness was measured using a Vickers hardness tester (manufactured by Mitutoyo Co., Ltd., product name "HM-200") in accordance with JISZ2244: 2009.

<Impact resistance>
Since impact resistance is related to the toughness of the material, we focused on the evaluation of the toughness of the metal. The toughness evaluation was performed in accordance with the metal tensile test (JISZ2241: 2011), and attention was paid to the elongation (%) and drawing (%) of each material. "◎" for those with elongation (%) and aperture (%) of 50% or more, "○" for those with less than 50% and 10% or more, and "△" for those with less than 10% and 1% or more. Those with less than 1% were marked with "x".

From Table 1, silicon nitride is excellent in heat resistance and hardness, but SUS310s was selected as the most suitable material for the protective tube because impact resistance is of the utmost importance.

In order to prove the results shown in Table 1, the results of a durability comparison test of the protective tube using SUS310s, cantal, Inconel and silicon nitride as the material of the protective tube are shown below.

[Durability comparison test of protective tube 1]
The L / D from the outlet end of the cement firing furnace is set to 11 and the thickness of the protective tube is fixed at 3 mm. The following evaluations were made. As the thermocouple thermometer, an R thermocouple (manufactured by Chino Corporation, type "platinum-13% rhodium") was used.

<Durable time>
The time from the start of temperature measurement with the thermocouple thermometer to the damage of the thermocouple thermometer was measured as the useful time.

<Durability>
"◎" for measured useful time of 1,500 hours or more, "○" for less than 1,500 hours and 500 hours or more, "△" for less than 500 hours and 30 hours or more, 30 hours Those less than or equal to are marked with "x".

(Example 1)
The evaluation was performed using a protective tube having an outer diameter D _t of 18 mm, an inner diameter _dt of 12 mm, a thickness of 3 mm, and a material of SUS310s. The thermocouple thermometer was inserted so that the tip of the protective tube was 80 mm from the inner surface of the cement firing furnace of heat-resistant brick. The results are shown in Table 2.

(Example 2)
The outer diameter D _t was 18 mm, the inner diameter _dt was 12 mm, the thickness was 3 mm, and the material was evaluated using a protective tube made of Cantal cheese. The thermocouple thermometer was inserted so that the tip of the protective tube was 80 mm from the inner surface of the cement firing furnace of heat-resistant brick. The results are shown in Table 2.

(Example 3)
The outer diameter D _t was 18 mm, the inner diameter _dt was 12 mm, the thickness was 3 mm, and the material was evaluated using a protective tube of Inconel. The thermocouple thermometer was inserted so that the tip of the protective tube was 80 mm from the inner surface of the cement firing furnace of heat-resistant brick. The results are shown in Table 2.

(Example 4)
The evaluation was performed using a protective tube having an outer diameter D _t of 18 mm, an inner diameter _dt of 12 mm, and a thickness of 3 mm, and the material was silicon nitride. The thermocouple thermometer was inserted so that the tip of the protective tube was 80 mm from the inner surface of the cement firing furnace of heat-resistant brick. The results are shown in Table 1.

From Table 2, the service life of Example 1 using SUS310s as the material of the protective tube was the longest. However, when the thickness of the protective tube was 3 mm, all the protective tubes were damaged within one week, and the durability was slightly low. The temperature of the protective tube until the damage remained around 1,200 ° C.

[Durability comparison test 2 of protective tube]
From the results in Tables 1 and 2, SUS310s having the longest impact resistance and service life were selected, and a durability comparison test of the protective tube of SUS310s with an increased thickness was performed.
A thermocouple thermometer having an L / D of 11 from the outlet end of the cement firing furnace, a protective tube thickness of 6 mm, a constant material of SUS310s, and a protective tube inside the cement firing furnace from between the divided brick stop iron plates. Was inserted to evaluate the above-mentioned service life and durability. As the thermocouple thermometer, an R thermocouple (manufactured by Chino Corporation, type "platinum-13% rhodium") was used.

(Examples 5 to 8)
Evaluation was performed on four protective tubes having an outer diameter D _t of 18 mm, an inner diameter _dt of 6 mm, a thickness of 6 mm, and a material of SUS310s. The thermocouple thermometer was inserted so that the tip of the protective tube was 80 mm from the inner surface of the cement firing furnace of heat-resistant brick. The results are shown in Table 3.

From Table 3, the thermocouple thermometer with four protective tubes, which had an L / D of 11 from the outlet end of the cement firing furnace, had a thickness of 6 mm, and was made of SUS310s, was evaluated. As a result, the useful life of all four protective tubes exceeded 1,000 hours, and two of them had a useful life of more than 1,500 hours. It was confirmed that if the service life is as long as this, continuous temperature measurement in the cement firing furnace is possible by replacing the thermocouple thermometer every rest.
By inserting a thermocouple thermometer with a protective tube into the cement firing furnace from between the divided brick stop iron plates, it was confirmed by inspecting the inside of the furnace at the time of suspension that it was possible to prevent damage caused by being rubbed by heat-resistant bricks. ..

[Durability comparison test 3 of protective tube]
From the results in Tables 1 and 2, SUS310s having the longest impact resistance and service life were selected, and a durability comparison test of the protective tube of SUS310s with an increased thickness was performed.
A thermocouple thermometer having an L / D of 8 from the outlet end of the cement firing furnace, a protective tube thickness of 6 mm, a constant material of SUS310s, and a protective tube inside the cement firing furnace from between the divided brick stop iron plates. Was inserted to evaluate the above-mentioned service life and durability. As the thermocouple thermometer, an R thermocouple (manufactured by Chino Corporation, type "platinum-13% rhodium") was used.

(Comparative Examples 1 to 4)
Evaluation was performed on four protective tubes having an outer diameter D _t of 18 mm, an inner diameter _dt of 6 mm, a thickness of 6 mm, and a material of SUS310s. The thermocouple thermometer was inserted so that the tip of the protective tube was 80 mm from the inner surface of the cement firing furnace of heat-resistant brick. The results are shown in Table 4.

From Table 4, the thermocouple thermometer with four protective tubes, which had an L / D of 7 from the outlet end of the cement firing furnace, had a thickness of 6 mm, and was made of SUS310s, was evaluated. As a result, it was found that the service life of all the thermometers was less than 1,500 hours, and it was difficult to continuously measure the temperature between idles at the position where the L / D was 7.
By inserting a thermocouple thermometer with a protective tube into the cement firing furnace from between the divided brick stop iron plates, it was confirmed by inspecting the inside of the furnace at the time of suspension that it was possible to prevent damage caused by being rubbed by heat-resistant bricks. ..

10 Raw material input device 11 Raw material 12 Raw material input unit 13 Cooler 20 Cement firing furnace 21 Combustion device 22 Kiln burner 23 Brick stop iron plate 24 Castable refractory 25 Refractory brick 26 Shell surface 30 Temperature measuring device 31, 31A to 31D Thermoelectric antithermometer 32 Protective tube 33 Wireless transmitter 34 Battery 40 Firing furnace drive control device 50 Control device 60 Input device 201 Temporary firing zone 202 Detachable zone 203 Firing zone 204 Cooling zone

Claims (7)

A method for measuring the temperature inside a cement firing furnace having a length of L (m) and an outer diameter of D (m).
A thermocouple thermometer having a protective tube is placed at a position where the ratio of the length from the outlet end of the cement firing furnace to D is 8 or more and 15 or less, and the temperature of the object to be heated in the cement firing furnace is set. A method for measuring the temperature inside the furnace. The method for measuring an in-furnace temperature according to claim 1, wherein the thermocouple thermometer is at the same distance from the outlet end of the cement firing furnace, and a plurality of thermocouple thermometers are provided in the circumferential direction of the cement firing furnace. Refractory bricks are provided on the inner wall of the cement firing furnace.
The refractory bricks are fixed in position by a brick stop iron plate that is divided into a plurality of parts in the circumferential direction of the cement firing furnace and mounted and fixed to the inner wall.
The method for measuring the temperature inside a furnace according to claim 1 or 2, wherein the thermocouple thermometer is inserted into the cement firing furnace from between the divided brick-stopping iron plates. The outer diameter of the protective tube is D _t (mm), and the outer diameter is D t (mm).
The method for measuring the temperature inside a furnace according to claim 3, wherein the insertion distance L _{t (mm) of the thermocouple thermometer is 2 Dt} or more at the tip of the protective tube from the inner surface of the cement firing furnace of the refractory bricks. The method for measuring the temperature inside a furnace according to any one of claims 1 to 4, wherein the material of the protective tube is at least one selected from SUS310s, cantal, inconel, and silicon nitride. The outer diameter of the protective tube is D _t (mm) and the inner diameter is _dt (mm).
The method for measuring the temperature inside a furnace according to any one of claims 1 to 5, wherein the thickness of the protective tube _{satisfies (D t} −d _{t) / 2 ≧ 6.} An in-core monitoring system for a cement firing furnace having a length of L (m) and an outer diameter of D (m).
Temperature measurement for detecting temperature data in the cement firing furnace with a thermocouple thermometer having a ratio of the length from the outlet end of the cement firing furnace to D to 8 or more and 15 or less and having a protective tube. With the device,
An in-core monitoring system including a control device that receives the temperature data and monitors the material temperature and the firing state of the object to be heated in the cement firing furnace.

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