JPH08136159A - Heating device of vessel having refractory inside lining, and its heating temperature controlling method - Google Patents

Abstract

PURPOSE: To contrive improvement of a fuel efficiency, a prevention of rupture of refractory material and improvement of quality, by heating an inner section of a vessel so that a radiation temperature of a vessel surface follows a refractory temperature pattern in a low temperature region of an atmospheric temperature in a vessel, and executing a heating so that an atmospheric temperature follows a refractory temperature pattern, in a high temperature region. CONSTITUTION: A heating device is provided with a programme setting device 3 executing a storing of a refractory temperature pattern 2 indicating, in a lapse of time, a temperature history of a refractory inner face of a vessel 1, and temperature indication regulators 4, 5. The temperature indication regulator 4 controls a flow quantity indication regulator 8 so that a measured value TA of a radiation temperature sensor 6 follows the refractory temperature pattern 2, and the temperature indication regulators 5 controls the flow quantity indication regulator 8 so that a measured value TB of an atmospheric temperature sensor 7 follows the refractory temperature pattern 2. A switch driving means 20 executes a change- over of switches 17, 18 to the temperature indication regulator 4 side, in a low temperature region wherein an atmospheric temperature is equal to a predetermined value T1 or lower in an inside of the vessel and executes a change-over of switches 17, 18 to the temperature indication regulator 5 side, when an atmospheric temperature exceeds the predetermined value T1 .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating device for a refractory lined container and a heating temperature control method thereof.

[0002]

2. Description of the Related Art A refractory lining container (such as a ladle) used for transporting molten steel from a converter to a casting facility is one in which a refractory is lined on the inner surface of a pot outer skin of mild steel or the like. In this type of lined container, the refractory is damaged or melted due to thermal shock or continuous contact with molten steel during tapping in the converter.Therefore, it is necessary to repair the refractory regularly. There are small repairs, medium repairs, large repairs and full repairs of refractory materials depending on the degree of damage or melting of the refractory material.

[0003] For the repair work of this refractory, it was usual to use a fixed refractory formed in a predetermined shape such as a block from the beginning, and to fix this to the inner surface of the outer skin of the container.
Since such work requires skill and is a heavy labor, recently, a clay-like or mud-like unshaped refractory material is applied to the inside of the outer skin to tend to rationalize the repair work.

However, unlike the standard refractory which has been dried in advance, the irregular refractory contains 6 to 7% of water when it is undried (at the time of repair work). As with the case above, sudden heating may cause an explosion. Therefore, in the past, the temperature inside the container was gradually and gradually dried and raised until the moisture of the amorphous refractory was completely drained, and after the moisture was drained, the temperature of the container was changed to 1000 ° C at a stretch.
The temperature is raised above the above.

By the way, the optimum refractory temperature pattern for carrying out the fastest temperature rise progress while preventing the explosion of the above-mentioned irregular-shaped refractory is the refractory itself after a certain time has passed for each kind of the refractory. Is predetermined as the temperature. Therefore, even in the actual container heating process, it is desirable to measure the temperature of the refractory itself by the temperature sensor adhered to the inner surface of the refractory and control the heating means so that the measured value matches the refractory temperature pattern. However, in this case, since the temperature sensor adhered to the inner surface of the refractory material can be used only once, a new temperature sensor must be adhered each time the repair is performed, which increases the working time and material cost.

Therefore, conventionally, as shown in FIGS. 4 and 5, for example, instead of the temperature of the refractory itself, the inside of the container is heated and controlled based on the atmospheric temperature pattern inside the container and the fuel flow rate pattern of the burner. I have to. That is,
In the heating device of FIG. 4, a container 25 lined with an irregular refractory material is provided with a burner 26 for heating the inside of the container 25 and an atmosphere temperature sensor 27 for measuring the atmosphere temperature in the container 25, and the program setting is performed. The vessel 28 stores an ambient temperature pattern 29 that represents the temperature change of the ambient temperature over time.

The ambient temperature pattern 29 stored in the program setter 28 is associated with the optimum refractory temperature pattern 30 by several heating experiments, and the measured value by the ambient temperature sensor 27 is applied. Temperature indicating controller 3 so as to follow the ambient temperature pattern 29
1 controls the regulating valve 32 of the burner 26. On the other hand, the heating device of FIG. 5 is provided with a program setter 34 that stores a flow rate pattern 33 that represents changes in the fuel flow rate over time, and the flow rate pattern 33 stored by the setter 34 is stored several times. It is associated with the optimum refractory temperature pattern 30 by the heating experiment of 1. and the control valve 32 of the burner 26 is controlled by the flow rate indicator controller 36 so that the measured value by the flow rate sensor 35 follows the flow rate pattern 33. Controlled.

[0008]

If the ambient temperature pattern 29 and the flow rate pattern 33 always have the same inclination and similar relationship with the refractory temperature pattern 30 at all times, known corrections to those patterns 29 and 33 are made. If the amount is taken into consideration, the temperature of the refractory itself can be accurately reproduced by the control method based on the ambient temperature and the fuel flow rate described above.

However, in practice, as shown in FIG. 2, for example, especially in the low temperature region corresponding to the dry period of the irregular refractory material, the ambient temperature and the fire resistance in the container 25 depend on the temperature, the temperature rising rate and the combustion amount at that time. The temperature difference from the internal surface temperature is about 50 ° C
It has been found to vary between ~ 250 ° C. Therefore, no matter how much the above-mentioned control by the ambient temperature (Fig. 4) is carried out in such a low temperature region, the temperature itself of the refractory cannot be accurately grasped, and therefore, the explosion of the amorphous refractory is prevented while being prevented. It is difficult to carry out the fastest temperature rise process. This also applies to the control based on the fuel flow rate (FIG. 5).

On the other hand, in order to avoid such an inconvenience, if an attempt is made to carry out a refractory temperature pattern by a temperature sensor adhered to the inner surface of the refractory, a new temperature sensor is required for each repair as described above, and the working time is increased. And the material cost becomes high. In view of such circumstances, the present invention can accurately implement the temperature pattern of the refractory itself without bonding the temperature sensor to the inner surface of the refractory, particularly in the low temperature range until the water content of the irregular refractory is completely drained. Thus, the object is to improve fuel efficiency, prevent explosion of irregular-shaped refractory materials, and improve quality.

[0011]

In order to achieve the above object, the present invention takes the following technical means. That is, the method of the present invention is a refractory lined container in which an irregular shaped refractory is lined, and the inside of the refractory liner is heated on the basis of a refractory temperature pattern representing the temperature change of the refractory inner surface with time. In the heating temperature control method, in the low temperature range where the atmospheric temperature in the container is a predetermined value or less, while heating the inside of the container so that the radiation temperature of the container surface follows the refractory temperature pattern, In a high temperature range in which the ambient temperature exceeds a predetermined value, the inside of the container is heated so that the ambient temperature follows the refractory temperature pattern (claim 1).

In this case, for a reason to be described later, in a high temperature range where the atmosphere temperature in the container exceeds a predetermined value, the atmosphere temperature is set to a value higher than the refractory temperature pattern by a certain temperature. It is preferable that the refractory temperature pattern be made to follow (claim 2), and that the predetermined value when the temperature is lowered is set lower than the predetermined value when the temperature is raised (claim 3).

When the ambient temperature in the container exceeds a second predetermined value which may affect the temperature sensor for measuring the radiation temperature, the temperature sensor is shielded from the heat radiation of the container. It is also possible to set it (Claim 4). In this case, for the reason described below, it is preferable to set the second predetermined value when the temperature is lower than the second predetermined value when the temperature is raised (claim 5).

Further, the apparatus of the present invention comprises a program setter for storing a refractory temperature pattern, which shows a temperature profile of the refractory inner surface of a container lined with an amorphous refractory with time, and the refractory inside the container. A temperature indicating controller for setting the temperature based on the object temperature pattern, and a heating device for a refractory lined container provided with, a radiation temperature sensor for measuring the radiation temperature of the container surface, and the measured value of this radiation temperature sensor is A first temperature indicating controller that sets the temperature so as to follow the refractory temperature pattern, an atmosphere temperature sensor that measures the atmosphere temperature in the container, and a measurement value of this atmosphere temperature sensor so as to follow the refractory temperature pattern. A second temperature indicating controller for setting a temperature, and a switch means for selectively activating one of the first and second indicating controllers (claim 1) 6).

In this case, the first temperature indicating controller operates in a low temperature range where the atmosphere temperature in the container is below a predetermined value, and the second temperature indicating adjustment operates in a high temperature range where the atmosphere temperature in the container exceeds a predetermined value. Switch driving means for switching the switch means to operate the meter is provided in the first temperature indicating controller (claim 7). Further, it is preferable to provide an openable / closable shielding means for shielding the radiation temperature sensor from heat radiation of the container (claim 8).

[0016]

In the present invention, the container 1 is a means for indirectly and accurately measuring the temperature of the refractory 1A itself in the low temperature range where the water content of the irregular refractory 1A cannot be completely removed.
A non-contact type radiation temperature sensor 6 was installed outside the.
Then, when the measured value T _{A of the} sensor 6 and the refractory temperature pattern 2 were compared, the measured value T _A could be matched with the refractory temperature pattern 2 as shown in FIG.

However, the radiation temperature sensor 6 has a low temperature sensor capable of measuring in the range of 0 ° C. to 800 ° C. and 500 to 60 because of the internal pyroelectric element and the like.
There is a sensor for high temperature that cannot be measured at 0 ° C or lower, and there is no sensor that can measure over a wide range from 0 ° C to 1000 ° C or higher required for this type of heating device. Moreover, the radiation temperature sensor 6 is Since it is expensive, provision of both low temperature and high temperature leads to high cost.

On the other hand, the ambient temperature sensor 7 does not exactly match the refractory temperature pattern 2 in the low temperature range where the moisture content of the refractory 2 is not completely exhausted, but over a wide range from 0 ° C to 1000 ° C or higher. Can be measured. Therefore, the present invention adopts the radiation temperature sensor 6 for low temperature in a low temperature range where the ambient temperature T _B does not conform to the refractory temperature pattern 2.
The radiation temperature control is performed to heat the inside of the container 1 so that the radiation temperature T _A follows the refractory temperature pattern 2, and the ambient temperature sensor 7 is used in a high temperature range where the radiation temperature sensor 6 cannot be applied.
Adopted, ambient temperature T _B is decided to perform the atmospheric temperature control for heating the interior of the container 1 so as to follow the refractory temperature pattern.

As a result, the temperature pattern of the refractory 1A itself can be accurately executed in all temperature ranges required for heating and drying the refractory 1A without directly bonding the temperature sensor to the irregular-shaped refractory 1A. .

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a heating device for a refractory lined container 1 according to the present invention. In the figure, this heating device includes a program setter 3 for storing a refractory temperature pattern 2 showing a temperature profile of a refractory inner surface of a container 1 lined with an irregular refractory 1A with time, and a container 1 for the program. Two independent temperature indicating controllers 4 and 5 for setting the temperature of the inside based on the refractory temperature pattern 2 are provided.

The refractory temperature pattern 2 differs depending on the material and water content of the amorphous refractory 1A, and is determined by an experiment or the like performed prior to the actual repair work.
The container 1 is provided with a radiation temperature sensor 6 for measuring a radiation temperature on the surface of the container 1 and an atmosphere temperature sensor 7 for measuring an atmosphere temperature in the container 1, and the radiation temperature sensor 6 includes the first One temperature indicating controller 4 is connected, and the ambient temperature sensor 7 is connected to the second temperature indicating controller 5.

The first temperature indicating controller 4 is a radiation temperature sensor 6
Of the measured value T _A of the refractory temperature pattern 2
The second temperature indicating controller 5 controls the flow rate indicating controller 8 to be described later, while the second temperature indicating controller 5 controls the flow rate indicating controller 8 so that the measured value T _B of the ambient temperature sensor 7 follows the refractory temperature pattern 2. Is to control. The radiation temperature sensor 6 is for low temperature with an emissivity learning function, and a thermistor bolometer detection element can be used for this, for example. Further, as the ambient temperature sensor 7, an R thermocouple or a K thermocouple can be adopted.

A burner 9 is provided at the center of the canopy 1B of the container 1.
This burner 9 is connected to the fuel supply means 12 by a pipe 11 in the middle of which a flow rate adjusting valve 10 for adjusting the fuel flow rate is provided. The flow rate indicating controller 8 is a signal 1 from any of the temperature indicating controllers 4 and 5.
3, the opening degree of the control valve 10 is adjusted based on 3, and one of the temperature indicating controllers 4 and 5 changes the temperature signal 14 from the program setting device 3 into the flow rate setting signals 15 and 16.
And the signals 15 and 16 are converted into
To communicate.

That is, each of the temperature indicating controllers 4 and 5 is connected to the flow rate indicating controller 8 via the first switch 17, and the program setting device 3 and the first and second temperature indicating controllers 4 and 5 are connected. A second switch 18 for selectively transmitting the temperature signal 14 from the setting device 3 to either one is provided between the second switch 18 and the switch 5. Reference numeral 19 is a flow rate sensor for measuring the flow rate of the fuel passing through the pipe 11.

On the other hand, in the second temperature indicating controller 5, the first and second switches 1 are so arranged that only one of the first temperature indicating controller 4 and the second temperature indicating controller 5 functions.
Switch driving means 20 for switching between 7 and 18 is provided. The switch driving means 20 is provided on the first temperature indicating controller 4 side in a low temperature range where the ambient temperature T _B in the container 1 is equal to or lower than a predetermined value (sensor switching temperature) T ₁ which has been clarified beforehand by experiments or the like. In the high temperature range in which the first and second switches 17 and 18 are switched and the ambient temperature T _B in the container 1 exceeds the predetermined value T ₁ , the first and second switches 17 are provided on the second temperature indicating controller 5 side. , 18 are switched.

Further, in the present embodiment, an openable / closable shielding means 21 is provided between the radiation temperature sensor 6 and the container 1, and the shielding means 21 keeps the radiation temperature sensor 6 from heat of the container 1 in a high temperature range. Shielding from radiation prevents the pyroelectric element of the sensor 6 from breaking. Furthermore, the second temperature indicating controller 5
Is the shielding means 21 based on the ambient temperature T _B in the container 1.
A shield drive means (not shown) for controlling the opening and closing of is also incorporated.

That is, the shield driving means uses the second predetermined value (shield switching temperature) at which the ambient temperature T _B in the container 1 may affect the pyroelectric element of the radiation temperature sensor 6.
The drive signal 22 is set so that the shielding means 21 is opened in the low temperature region of T ₂ or lower, and the shielding means 21 is closed when the ambient temperature T _B in the container 1 exceeds the second predetermined value T _2. Emit.

When the sensor switching temperature T ₁ is fixed at one value, the control by the radiation temperature and the control by the ambient temperature are frequently switched in the vicinity of the set temperature T ₁ , and the hunting is amplified and unstable combustion occurs. May be Therefore, in this embodiment, as shown in FIG. 3A, the sensor switching temperature T _1d in the temperature lowering process is set to be slightly lower than the sensor switching temperature T _{1u in the} temperature rising process to switch between the two controls. The frequency is reduced, thereby eliminating the inconvenience.

If the shielding switching temperature T ₂ is fixed to one value, the shielding means 21 near the set temperature T _{2 is} set.
Are frequently opened and closed, which may cause a failure in the drive system. Therefore, in the present embodiment, as shown in FIG. 3B, the shielding switching temperature T _2d in the temperature lowering process is set to be slightly lower than the shielding switching temperature T _{2u in the} temperature rising process to open / close the shielding means 21. The frequency is reduced, thereby eliminating the inconvenience. (Experimental example) FIG. 2 shows verification results of temperature patterns when the above heating device is applied to a container (molten steel ladle) 1 that conveys molten steel of about 250 tons and the inside of the container 1 is actually heated by this heating device. Shows.

As can be seen from FIG. 2, the radiation temperature control is in good agreement with the refractory temperature pattern in the low temperature region of 650 ° C. or lower, and the atmospheric temperature control is in the refractory temperature pattern in the high temperature region of 650 ° C. or higher. The temperature control according to the refractory temperature pattern is performed accurately in all temperature ranges. Further, according to this experimental example, in a high temperature range of 650 ° C. or higher, the atmospheric temperature T _B at a certain point is about 50 ° C. higher than the refractory temperature pattern due to a time delay in the combustion process in the container 1. It became clear that it would be measured higher.

Therefore, in reality, in a high temperature range where the atmospheric temperature T _B in the container 1 exceeds 650 ° C. (sensor switching temperature T ₁ ), the atmospheric temperature T _B is only 50 ° C. higher than the refractory temperature pattern. The ambient temperature T _B is made to follow the refractory temperature pattern so as to coincide with the high value, whereby the temperature inside the container 1 can be controlled substantially in the refractory temperature pattern even in the high temperature range. .

Further, in this experimental example, the sensor switching temperature T _1u in the temperature increasing process is set to 680 ° C. and the sensor switching temperature T _1d in the temperature decreasing process is set to 650 ° C. _2u was set to 700 ° C, and the shield switching temperature T _2d in the temperature lowering process was set to 680 °. As a result, hunting at the time of sensor switching and shielding switching does not occur, and unstable combustion in the container 1 and failure of the shielding means 21 can be prevented.

The present invention is not limited to the above embodiment.

[0034]

As described above, according to the present invention,
Since the temperature pattern of the refractory 1A itself can be accurately performed in all temperature ranges required for drying and heating the irregular refractory 1A without directly attaching the temperature sensor to the refractory 1A, the fuel efficiency is improved and the irregular shape is improved. It is possible to prevent explosion of the refractory 1A and improve its quality (claim 1).

Further, in the high temperature range where the atmospheric temperature T _B in the container 1 exceeds the predetermined value T ₁ , when the atmospheric temperature T _B is matched with a value higher than the refractory temperature pattern 2 by a constant temperature, the high temperature The refractory temperature in the area can be controlled with high precision (claim 2). Further, the predetermined value T at the time of temperature rise
_By setting the predetermined value T _1d at the time of cooling to be lower than _{1 u} , hunting at the time of switching the sensor is eliminated, and unstable combustion in the container 1 near the predetermined switching temperature can be avoided (claim 3). ).

Further, if the radiation temperature sensor 6 is shielded from the heat radiation of the container 1 when the atmospheric temperature T _B in the container 1 exceeds the second predetermined value T ₂ , the radiation temperature is caused by excessive radiation heat. It is possible to prevent the sensor 6 from breaking down (Claim 4). In this case, if the second predetermined value T _2d when the temperature is lowered is set to a value lower than the second predetermined value T _2u when the temperature is raised, the hunting at the time of switching the shield is eliminated, and the shielding means 21 operates. Failure can be prevented in advance (Claim 5).

[Brief description of drawings]

FIG. 1 is a control circuit diagram of a heating device for a refractory lined container according to the present invention.

FIG. 2 is a graph showing a verification result of a temperature pattern according to the present invention.

FIG. 3 is an explanatory diagram showing a method for setting a sensor switching temperature and a shielding switching temperature.

FIG. 4 is a control circuit diagram of a heating device for a conventional refractory lined container.

FIG. 5 is a control circuit diagram of a heating device for a conventional refractory lined container.

[Explanation of symbols]

 1 Container 1A Irregular refractory 2 Refractory temperature pattern 3 Program setter 4 First temperature indicating controller 5 Second temperature indicating controller 6 Radiation temperature sensor 7 Ambient temperature sensor 17 Switch means (first switch) 18 Switch means ( Second switch) 20 Switch driving means 21 Shielding means

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Masatoshi Tsukamoto 2-4-7 Kyomachibori, Nishi-ku, Osaka City, Osaka Prefecture Chugai Furnace Industry Co., Ltd. (72) Inventor Ryuichi Odawara 1 Kanazawacho, Kakogawa-shi, Hyogo Co., Ltd. Kadogawa Steel Works Kakogawa Steel Works (72) Inventor Yuji Ochiai 1 Kanazawa-machi, Kakogawa City, Hyogo Prefecture Kadogawa Steel Works Kakogawa Steel Works (72) Inventor Morichi Hatoguchi Kanazawa-machi, Kakogawa City, Hyogo Prefecture Shinko Mec Kasukawa Works Co., Ltd.

Claims (8)

[Claims] 1. A refractory temperature pattern (2) showing the temperature change of the inner surface of the refractory (1A) inside the container (1) lined with the irregular refractory (1A) based on time. in the heating temperature control method of the refractory lined vessel so as to heat, in the low temperature range ambient temperature (T _B) is a predetermined value (T ₁₎ following in the container (1), the radiation of the container (1) surface The inside of the container (1) is heated so that the temperature (T _A ) follows the refractory temperature pattern (2), and the ambient temperature (T _B ) in the container (1) is a predetermined value (T ₁ ). In a high temperature range exceeding 1, the heating temperature control method for a refractory lined container is characterized in that the inside of the container (1) is heated so that the ambient temperature (T _B ) follows the refractory temperature pattern (2). . 2. In a high temperature range in which the ambient temperature (T _B ) in the container (1) exceeds a predetermined value (T ₁ ), the ambient temperature (T _B ) is a constant temperature than the refractory temperature pattern (2). The heating temperature control method for a refractory lined container according to claim 1, characterized in that the ambient temperature (T _B ) is made to follow the refractory temperature pattern (2) so as to coincide with a high value. 3. The fire resistance according to claim 1, wherein the predetermined value (T _1d ) when the temperature is lowered is set lower than the predetermined value (T _1u ) when the temperature is raised. Method for controlling heating temperature of container lined with material. 4. When the ambient temperature (T _B ) in the container (1) exceeds a _second predetermined value (T ₂ ) that may affect the temperature sensor (6) for measuring the radiation temperature. To
The heating temperature control method for a refractory lined container according to claim 1, 2 or 3, wherein the temperature sensor (6) is shielded from heat radiation of the container 1. 5. The second predetermined value (T _2d ) when the temperature is lowered is set to be lower than the second predetermined value (T _2u ) when the temperature is raised. The method for controlling the heating temperature of a refractory lined container according to. 6. A program setting device (2) for storing a refractory temperature pattern (2) showing a temperature profile of a refractory (1A) inner surface of a container (1) lined with an irregular refractory (1A) over time. 3) and a temperature indicating controller (4) (5) for setting the temperature inside the container (1) based on the refractory temperature pattern (2), the heating device for the refractory lined container, wherein the container (1) radiation temperature sensor (6) for measuring the radiation temperature of the surface, the temperature set to the measured value of the radiation temperature sensor (6) (T _a) to follow the refractory temperature pattern (2) a first temperature indicating controller (4), the ambient temperature sensor (7) for measuring the ambient temperature of the container (1), wherein the refractory temperature pattern measurements (T _B) of the ambient temperature sensor (7) Second temperature instruction to set temperature to follow (2) And a switch means (17) (18) for selectively activating one of the first and second indicating controllers (4) (5). A device for heating refractory lined containers. 7. The first temperature indicating controller (4) operates in a low temperature range where the ambient temperature (T _B ) in the container (1) is a predetermined value (T ₁ ) or less, and the inside of the container (1) Switch means (17) so that the second temperature indicating controller (5) operates in a high temperature range in which the ambient temperature (T _B ) exceeds a predetermined value (T ₁ ).
The heating device for a refractory lined container according to claim 6, wherein a switch driving means (20) for switching (18) is provided in the first temperature indicating controller (4). 8. The heating device for a refractory lined container according to claim 6 or 7, further comprising openable / closable shielding means (21) for shielding the radiation temperature sensor (6) from heat radiation of the container (1). .