JP6632555B2 - Heating device and heating method inside refractory container - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a heating device and a heating method inside a refractory container which is used for a molten metal container, a tundish or the like and at least the inner surface side of which is made of a refractory material. In particular, in heating the inside of the refractory container as described above, it is characterized in that the temperature rise inside the refractory container is appropriately controlled so that the entire inside of the refractory container can be appropriately heated. is there.

  2. Description of the Related Art Conventionally, in a refractory container having at least an inner surface formed of a refractory used for a molten metal container, a tundish, or the like, the refractory on the inner surface is regularly replaced.

  And when the refractory on the inner surface side of the refractory container is replaced in this manner, a lid is provided on the refractory container, and a burner for heating the inside of the refractory container is provided on the lid. BACKGROUND ART The inside of a refractory container is heated and dried by a burner.

  At this time, since the metal that adhered when the molten metal was taken in and out was fixed to the upper edge of the outer surface of the refractory container and unevenness was formed, the lid material could not adhere, and the lid material It is provided to have.

  Here, when the inside of the refractory container is heated and dried by the above-described burner, it is necessary to appropriately set a state (temperature, temperature rising rate, etc.) for heating the inside of the refractory container. For example, if the amount of combustion is increased so as to increase the flame in the burner and the entire inside of the refractory container is continuously and quickly heated, the moisture contained in the refractory on the inner surface side of the refractory container is reduced. However, there has been a problem that the refractory is explosively exploded by steam generated inside the refractory due to rapid heating. On the other hand, if the amount of combustion in the burner is reduced to reduce the size of the flame, it becomes difficult to sufficiently heat the bottom inside the refractory container, and it takes time to heat the entire inside of the refractory container. There was a problem.

  Further, conventionally, before injecting a molten metal or the like into the inside of the refractory container as described above, the inside of the refractory container is heated by the burner, and the temperature between the molten metal and the inside of the refractory container is increased. The difference is also reduced, and in this case as well, it is necessary to appropriately set the state in which the inside of the refractory container is heated as described above, and the same problem exists.

  Here, conventionally, as shown in Patent Literature 1, a lid is provided so as to have a slight gap on the refractory container as described above, and the inside of the refractory container is provided on the lid. A heating burner for heating is provided, and while continuously measuring the amount of moisture contained in the refractory on the inner surface side of the refractory container, the amount of moisture contained in the refractory is controlled by controlling the amount of combustion gas of the heating burner. Has been proposed in which the amount of combustion gas in the heating burner is increased from the time point when the value of becomes substantially zero, and the refractory is fired.

  However, as disclosed in Patent Document 1, it is not possible to perform drying by controlling the amount of combustion gas of a heating burner while continuously measuring the amount of moisture contained in the refractory on the inner surface side of the refractory container. The control is very troublesome, the equipment cost is very high, and it becomes difficult to quickly heat the refractory inside the refractory container, and the temperature of the refractory inside the refractory container is difficult. There is a problem that it is difficult to appropriately control the change in the temperature.

  Further, in Patent Literature 2, a plurality of past heating histories of a refractory construction body of the same type as the refractory construction body to be heated at the present time indicate that the temperature of the refractory construction body is stabilized near a specific temperature. By calculating the average value of the stable temperature and the heating gas flow rate for a plurality of different specific temperatures, a heating gas flow rate pair corresponding to each of the specific temperatures is obtained. A set value of a heating gas flow rate corresponding to a target temperature pattern in current heating is determined based on a plurality of pairs of a specific temperature and a heating gas flow rate obtained in the above manner, and the flow rate of the heating gas is the set value and Heating the refractory construction body while controlling so that the temperature difference between the temperature measurement value and the target temperature when the refractory construction body is heated to maintain a constant temperature, and calculating the temperature difference According to the heating gas By varying the flow rate, and heating the refractory construction body to the target temperature, which was set to drying the refractories it has been proposed.

  However, even in the technique disclosed in Patent Document 2, control for heating and drying the refractory construction body to a predetermined target temperature is very troublesome, and equipment costs and the like are extremely high. In addition, as shown in Patent Document 1, when a gap is provided between the refractory construction body and the lid, the temperature does not easily rise, and the refractory inside the refractory construction body is quickly heated. And it becomes difficult to appropriately control a change in the temperature of the refractory inside the refractory construction body.

JP-A-11-92236 JP 2003-240446 A

  An object of the present invention is to solve the above-described problem when heating the inside of a refractory container having at least an inner surface side made of a refractory, and heating the inside of the refractory container. It is an object of the present invention to appropriately control the temperature rise inside the refractory container and appropriately heat the entire inside of the refractory container.

In the heating device inside the refractory container according to the present invention, in order to solve the above-described problem , at least on the opening portion of the upper surface of the refractory container whose inner surface side is made of a refractory, through a gap In the heating device inside the refractory container provided with a burner for heating the inside of the refractory container so as to cover the cover material and penetrate the cover material, while continuously burning the fuel by the burner, A continuous combustion control mechanism for adjusting the amount of combustion, and an on / off combustion control mechanism for adjusting the switching time between burning and stopping of the fuel by the burner and the amount of combustion during the combustion are provided. control, a switching device for switching between said consecutive combustion control mechanism and on-off combustion control mechanism is provided, wherein the switching device, the fireproof container inside the Until the temperature rises to a constant temperature, the control of combustion by the burner is performed by the on / off combustion control mechanism, and convection heat is transmitted inside the refractory container. the control of combustion by the burners is performed by the continuous combustion control mechanism, and in so that the interior refractory vessel was radiation heat transfer.

With this configuration, when the inside of the refractory container is heated by the combustion by the burner, the control of the combustion by the burner is performed by the switching device according to the conditions for heating the inside of the refractory container. And the on / off combustion control mechanism can be appropriately switched.

Further, in the heating device inside the refractory container according to the present invention, a temperature measuring device is provided on the lid member, and based on the temperature measured by the temperature measuring device, the switching device is controlled by a control device. Thus, it is possible to switch between the continuous combustion control mechanism and the on / off combustion control mechanism to control the combustion by the burner .

Further, in the method for heating the inside of the refractory container according to the present invention, the above-described switching device is used until the inside of the refractory container rises to a predetermined temperature (the heat transfer mode is in a low-temperature region where convection is dominant). The burner is controlled by the above-mentioned on / off combustion control mechanism to conduct convective heat transfer inside the refractory container. On the other hand, when the temperature inside the refractory container becomes higher than a predetermined temperature (the heat transfer form is In the dominant high-temperature range), the switching device controls the combustion by the burner by the continuous combustion control mechanism, so that the inside of the refractory container is radiated and heat-transferred. As described above, until the inside of the refractory container rises to a predetermined temperature, the control of combustion by the burner is performed by the on / off combustion control mechanism, so that convection heat transfer is performed inside the refractory container. Even when the temperature measuring device is provided on the lid member as described above, the temperature of the entire inside of the refractory container can be measured uniformly and efficiently.

Further, in the method for heating the inside of the refractory container according to the present invention, when the inside of the refractory container becomes a predetermined temperature or higher, the control of combustion by the burner is performed by the continuous combustion control mechanism, In maintaining the inside of the container at a constant temperature by radiant heat transfer, when the amount of fuel supplied to the burner reaches a turndown limit, control of combustion in the burner is performed by the switching device, by the switching device. can be from continuous combustion control mechanism is switched on and off combustion control mechanism, controlling combustion so as not to reach the turndown limit of the burner.

In the heating device for the inside of the refractory container according to the present invention, when the inside of the refractory container is heated by burning the fuel with the burner as described above, the burner is used in accordance with the conditions for heating the inside of the refractory container. the control of combustion by, by the switching device, by appropriately switching between the continuous combustion control mechanism and on-off combustion control mechanism, by appropriately controlling the internal temperature of the refractory vessel, fireproof container The entire interior of the device can be appropriately heated.

Then, as in the method of heating the inside of the refractory container according to the present invention, until the inside of the refractory container rises to a predetermined temperature, the switching device controls the combustion by the burner by the on / off combustion control mechanism. When performing convection heat transfer inside the refractory container, there is a state where the flame is turned off even when the amount of combustion is increased so that the flame in the burner increases and the entire inside of the refractory container is heated. This prevents the moisture contained in the refractory on the inner surface side of the refractory container from being rapidly heated to cause explosion of the refractory. Further, when the temperature inside the refractory container becomes equal to or higher than a predetermined temperature, the control of the burner by the switching device is continuously performed by the continuous combustion control mechanism, so that the inside of the refractory container is radiated and heat-transferred. Then, even if there is a gap between the upper surface of the refractory container and the lid member, the temperature inside the refractory container can be appropriately raised or maintained.

It is the schematic explanatory drawing which showed the heating device inside the refractory container concerning one Embodiment of this invention. In the heating device inside the refractory container according to the embodiment, the switching device controls the combustion in the burner that heats the inside of the refractory container by an on / off combustion control mechanism, and FIG. -Schematic explanatory diagram showing a state in which combustion is performed by increasing the amount of combustion by an off-combustion control mechanism, and (B) is a schematic explanatory diagram showing a state in which the combustion is stopped by an on-off combustion control mechanism. . In the heating device inside the refractory container according to the embodiment, the switching device controls the combustion in the burner that heats the inside of the refractory container by a continuous combustion control mechanism, and FIG. FIG. 4B is a schematic explanatory view showing a state in which combustion is performed by reducing the amount of combustion by a mechanism, and FIG. 4B is a schematic explanatory view showing a state in which combustion is performed by increasing the amount of combustion by a continuous combustion control mechanism; In the heating device inside the refractory container according to the embodiment, the combustion in the burner that heats the inside of the refractory container is not turned down, and the switching device controls the combustion in the burner by the on / off combustion control mechanism. (A) is a schematic explanatory diagram showing a state in which combustion is performed with a reduced amount of combustion, and (B) is a schematic explanatory diagram showing a state in which the combustion is stopped. A burner for heating the inside of the refractory container by a switching device to control the temperature inside the refractory container along the target temperature line using the heating device inside the refractory container according to the above embodiment. FIG. 4 is a schematic explanatory diagram showing an example in which the control is switched to an on / off combustion control mechanism and a continuous combustion control mechanism.

  Hereinafter, a heating device and a heating method inside a refractory container according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings. In addition, the heating device and the heating method inside the refractory container according to the present invention are not limited to those shown in the following embodiments, and can be appropriately modified and implemented within a range that does not change the gist of the invention.

  In the heating device inside the refractory container according to this embodiment, as shown in FIG. 1 and the like, as the refractory container 10, a pan-shaped outer wall 11 having an open upper surface and an outer wall portion 11 made of steel or the like is used. The refractory 12 provided on the inner surface is used.

  Then, the lid 20 is disposed over the opening on the upper surface of the refractory container 10 so as to cover the opening with a gap s (approximately 10 to 20 cm). A burner 21 for heating the inside of the container 10 is provided, and a temperature measuring device 22 for measuring the temperature inside the refractory container 10 is provided, and the temperature inside the refractory container 10 measured by the temperature measuring device 22 is controlled. The data is output to the device 30.

  Further, in this embodiment, a continuous combustion control mechanism 31 that adjusts the amount of combustion while continuously burning the fuel by the burner 21 with respect to the burner 21, a switching time between burning and stopping the fuel by the burner 21, and An on / off combustion control mechanism 32 for adjusting the amount of combustion is provided, and a switching device 33 for switching the combustion by the burner 21 between the continuous combustion control mechanism 31 and the on / off combustion control mechanism 32 is provided. ing.

  In this embodiment, the temperature inside the refractory container 10 measured by the temperature measuring device 22 as described above is output to the control device 30, and according to the conditions for heating the inside of the refractory container 10, The control device 30 controls the switching device 33 to switch the combustion by the burner 21 between the continuous combustion control mechanism 31 and the on / off combustion control mechanism 32.

  Here, in this embodiment, for example, the switching device 33 is controlled by the control device 30 until the temperature inside the refractory container 10 measured by the temperature measurement device 22 reaches a predetermined temperature. The on / off combustion control mechanism 32 adjusts the switching time between the combustion and stop of the fuel by the burner 21 and the amount of combustion. As shown in FIGS. 2A and 2B, the amount of combustion in the burner 21 is reduced. The state in which combustion is performed by increasing the size of the flame and the state in which such combustion is stopped is switched at an appropriate timing.

  In this manner, as shown in FIG. 2 (A), in a state where the amount of combustion in the burner 21 is increased and the flame is burned so as to increase, the entire inside of the refractory container 10 is heated and convection transfer is performed. On the other hand, as shown in FIG. 2B, by stopping the combustion at an appropriate timing as described above, the entire inside of the refractory container 10 is excessively heated, and the refractory container 10 is heated. The water contained in the refractory 12 on the inner surface side of the refractory 12 is not suddenly heated, and the explosion of the refractory does not occur.

  Further, as shown in FIG. 2A, the amount of combustion in the burner 21 is increased, and the combustion is performed at an appropriate timing as shown in FIG. If the time for stopping the refractory container 10 is extended, the entire interior of the refractory container 10 is not excessively heated, and the refractory container 10 is heated by convection heat transfer so that the entire interior of the refractory container 10 has a constant temperature. Can be heated.

  Further, after the inside of the refractory container 10 is heated to a constant temperature as described above, the switching device is controlled by the control device 30 so as to further heat the inside of the refractory container 10. 33, the combustion amount is adjusted while continuously burning the fuel by the burner 21 by the continuous combustion control mechanism 31, and the combustion amount in the burner 21 is reduced as shown in FIGS. , The temperature inside the refractory container 10 is increased to a predetermined value by increasing the amount of combustion in the burner 21 and increasing the flame to keep the temperature inside the refractory container 10 constant. Or continuous combustion so as to raise the temperature up to the temperature. Since the fuel is continuously combusted by the burner 21 by the continuous combustion control mechanism 31 as described above, the outside air passes through the gap s between the upper surface of the refractory container 10 and the lid member 20 so that the outside air can be discharged. The temperature inside the refractory container 10 can be prevented from lowering without flowing into the inside.

  In addition, as shown in FIG. 3A, in the case where the amount of combustion in the burner 21 is reduced, the flame is reduced, and the temperature inside the refractory container 10 is kept constant to perform continuous combustion, Further, if it is necessary to reduce the amount of combustion in the burner 21, and if the lower limit of the turndown of the burner 21 to be continuously burned is exceeded, the switching device 33 is controlled by the control device 30 and the continuous combustion control mechanism described above. The state is switched from 31 to the on / off combustion control mechanism 32, and as shown in FIGS. 4A and 4B, the combustion amount and the flame in the burner 21 are reduced so as not to exceed the lower limit of the turndown, and the combustion is performed. Such a state in which combustion is stopped can be switched at an appropriate timing.

  Further, an example will be described in which the temperature inside the refractory container 10 is controlled along the target temperature line shown in FIG. 5 by using the heating device inside the refractory container.

  Here, the inside of the refractory container 10 is heated by the burner 21 using the above-described heating device for the inside of the refractory container, and the temperature inside the refractory container 10 is increased as shown by a target temperature line shown in FIG. In the control, initially, as shown in FIGS. 3A and 3B, the combustion amount in the burner 21 is increased and the flame is increased to perform combustion (on). The state (off) in which the appropriate combustion is stopped is switched at an appropriate timing, and the temperature inside the refractory container 10 is raised at a predetermined rate by convection heat transfer, and is included in the refractory 12 in the refractory container 10. The temperature of the inside of the refractory container 10 is raised to a first predetermined temperature so that the refractory does not explode due to the moisture that is generated. Thereafter, the time during which the combustion in the burner 21 is stopped is made longer than at the time of the above-mentioned temperature rise, and the entire inside of the refractory container 10 is controlled to be uniform at the first predetermined temperature by convection heat transfer. Note that these controls are actually turned on and off many times over a long period of time, but are simplified in FIG.

  Then, after the entire inside of the refractory container 10 is heated to the first predetermined temperature so that the explosion of the refractory does not occur, the switching device 33 is controlled by the control device 30 as described above. As shown in FIGS. 3A and 3B, the continuous combustion control mechanism 31 adjusts the amount of combustion in which the fuel is continuously burned by the burner 21, and raises the temperature inside the refractory container 10 to a predetermined heating rate. Then, the temperature inside the refractory container 10 is maintained at the second predetermined temperature. Here, since the fuel is continuously combusted by the burner 21 by the continuous combustion control mechanism 31 as described above, the outside air passes through the gap s between the upper surface of the refractory container 10 and the lid member 20 as described above. The temperature inside the refractory container 10 can be prevented from lowering without flowing into the refractory container 10.

  Further, when the fuel is continuously burned by the burner 21 and is maintained at the second predetermined temperature, the amount of combustion at the turndown limit in the burner 21 is large, and it is difficult to maintain the fuel at the second predetermined temperature. When it is necessary to exceed the lower limit of the turndown of the burner 21 for continuous combustion, the continuous combustion control mechanism 31 is switched to the on / off combustion control mechanism 32, and the above-mentioned FIG. As shown in (B), the state in which the combustion amount and the flame in the burner 21 are reduced so as not to exceed the lower limit of the turndown and the combustion is stopped, and the state in which such combustion is stopped are switched at appropriate timing. , At a second predetermined temperature.

10: refractory container 11: outer wall 12: refractory 20: lid 21: burner 22: temperature measuring device 30: control device 31: continuous combustion control mechanism 32: on / off combustion control mechanism 33: switching device s: gap

Claims (4)

At least an inner surface of the refractory container is made of a refractory material, and a lid material is arranged over the opening portion of the upper surface of the refractory container so as to cover through a gap. In a heating device inside a refractory container provided with a burner to be heated, a continuous combustion control mechanism for adjusting the amount of combustion while continuously burning fuel by the burner, a time for switching between burning and stopping fuel by the burner, and An on / off combustion control mechanism for adjusting the amount of combustion during combustion is provided, and a switching device for switching the control of combustion by the burner between the continuous combustion control mechanism and the on / off combustion control mechanism is provided. The switching device controls the combustion by the burner until the inside of the refractory container rises to a predetermined temperature. By performing convection heat transfer inside the refractory container, when the inside of the refractory container has reached a predetermined temperature or higher, control of combustion by the burner is performed by the continuous combustion control mechanism, and the inside of the refractory container is A heating device inside a refractory container characterized by radiant heat transfer .   The heating device inside the refractory container according to claim 1, wherein a temperature measuring device is provided on the lid member, and the switching device is controlled by a control device based on a temperature measured by the temperature measuring device. And a switching device for switching between the continuous combustion control mechanism and the on / off combustion control mechanism to control combustion by the burner.   3. The method for heating the inside of a refractory container using the heating device inside a refractory container according to claim 1 or 2, wherein the burner is switched by the switching device until the inside of the refractory container rises to a predetermined temperature. The combustion is controlled by the on / off combustion control mechanism, and the inside of the refractory container is subjected to convective heat transfer. A method of heating the inside of the refractory container by radiating heat inside the refractory container by controlling the combustion by the continuous combustion control mechanism.   4. The method for heating the inside of a refractory container according to claim 3, wherein when the inside of the refractory container has reached a predetermined temperature or higher, the control of combustion by the burner is performed by the continuous combustion control mechanism. In maintaining the inside of the container at a constant temperature by radiant heat transfer, when the amount of fuel supplied to the burner reaches a turndown limit, the switching device controls the combustion by the burner by the switching device. A method for heating the inside of a refractory container, wherein the combustion is controlled in a state where the turn-down limit of a burner is not reached by switching to an on / off combustion control mechanism.

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