JP2018165590A - Rotary kiln and control method of rotary kiln - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce frequency of stopping a rotary kiln caused by removing work of coating by suppressing generation of the coating on the inner peripheral surface of a kiln body.SOLUTION: A rotary kiln 1 comprises: a kiln body 2; a heating burner 4; temperature measuring means 11-15 measuring respective temperatures of multiple measuring points P1-P5 at the multiple measuring points P1-P5 set along the longitudinal direction of the kiln body 2; and control means adjusting the flame length of the heating burner 4 and controlling to vary the temperature distribution in the kiln body 2, when difference between the temperature at a predetermined measuring point among the multiple measuring points P1-P5 and a predetermined reference temperature is within a predetermined temperature range.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a technique for suppressing the generation of coaching on the inner peripheral surface of a kiln body.

In the kiln main body of the rotary kiln, for example, when performing lime baking treatment, the calcium carbonate (CaCO ₃ ) contained in the workpiece is heated by a heating burner to perform a baking reaction to become quick lime (CaO). Is called. At this time, due to the non-uniform temperature distribution of the flame of the heating burner, temperature unevenness occurs in the kiln body, and local heating (heat spot portion) occurs on the inner peripheral surface of the kiln body. A workpiece may adhere to the heat spot portion to form a coating. If this coaching is left as it is, it becomes difficult to discharge the workpiece, so it is necessary to remove it.

  To remove the coaching, the operation of the rotary kiln furnace is stopped, and then the coaching is manually excavated or possibly broken by using dynamite. In addition, about stopping the operation | movement of a rotary kiln furnace in this way, and removing a coaching, since it is widely implemented generally, a prior art document is not disclosed.

  Starting up a stopped rotary kiln furnace again requires a large amount of fuel and time to raise the furnace temperature. It will be bulky.

  Accordingly, an object of the present invention is to suppress the generation of coaching on the inner peripheral surface of the kiln main body and to reduce the frequency of stoppage of the rotary kiln furnace accompanying the removal of the coaching.

  A characteristic configuration of the rotary kiln furnace of the present invention is a rotary kiln furnace provided with a kiln main body and a heating burner, and at a plurality of measurement points set along the longitudinal direction of the kiln main body, When the difference between the temperature measuring means for measuring each temperature, the temperature at one predetermined measurement point of the plurality of measurement points, and a predetermined reference temperature is within a predetermined temperature range, the heating And a control means for controlling the flame length of the burner to change the temperature distribution in the kiln body.

  A further characteristic configuration of the rotary kiln furnace according to the present invention is that the predetermined reference temperature is a temperature at a measurement point for measuring a temperature of an end portion of the kiln main body opposite to the heating burner.

  The characteristic configuration of the rotary kiln furnace control method of the present invention is a rotary kiln furnace control method comprising a kiln body and a heating burner, and at a plurality of measurement points set along the longitudinal direction of the kiln body, The difference between the temperature measurement step for measuring the temperature of each of the plurality of measurement points, the temperature at one predetermined measurement point of the plurality of measurement points, and the predetermined reference temperature is within a predetermined temperature range. And a control step of adjusting the flame length of the heating burner to change the temperature distribution in the kiln body.

  A further characteristic configuration of the control method of the rotary kiln furnace according to the present invention is that the control step controls the flame length of the heating burner to change the temperature distribution in the kiln body, When the difference between the temperature at another predetermined measurement point different from the predetermined measurement point and the predetermined reference temperature is within the predetermined temperature range, the flame length of the heating burner is adjusted again to adjust the flame length. The point is to control the temperature distribution in the kiln body to change.

  In the present invention, it is determined that there is a high possibility that coaching is generated while measuring the surface temperature of the kiln body and detecting the temperature change at a plurality of measurement points set along the longitudinal direction of the kiln body. In this case, the flame length of the heating burner is changed to change the position of the heat spot portion to suppress the generation of the coaching. Therefore, according to the present invention, it is difficult for the coaching to be generated on the inner peripheral surface of the kiln main body, and the frequency of stopping the rotary kiln furnace accompanying the removal of the coaching can be reduced.

It is the schematic of a rotary kiln furnace. It is a graph which shows the relationship between the temperature in a rotary kiln furnace, and the distance from the heating burner. It is a graph which shows the relationship between the surface temperature of a kiln main body, and the distance from the heating burner. It is a flowchart of the control method (1st Example) of a rotary kiln furnace. It is a flowchart of the control method (2nd Example) of a rotary kiln furnace. It is a flowchart of the control method (3rd Example) of a rotary kiln furnace. It is a flowchart of the control method (4th Example) of a rotary kiln furnace.

[Embodiment]
Embodiments of the present invention will be described below.
(Rotary kiln furnace)
As shown in FIG. 1, the rotary kiln furnace 1 in the present embodiment is a horizontal rotary kiln furnace, and includes a cylindrical kiln main body 2, a front wall 3, and a heating burner 4.

  The kiln main body 2 is disposed so as to be inclined so that the upstream opening 6 is slightly higher than the downstream opening 7 and supported by a known rotating device (not shown) so as to be rotatable around an axis. ing. The kiln body 2 burns while flowing the workpiece M supplied from the upstream opening 6 side to the downstream opening 7 side while rotating.

  The front wall 3 is fixed on a base (not shown). A kiln body 2 is inserted into the front wall 3 so as to be rotatable about its axis. As a result, the upstream opening 6 of the kiln body 2 is closed by the front wall 3. Further, the front wall 3 is provided with a loading portion 8 communicating with the inside of the kiln main body 2, and the workpiece M is thrown into the kiln main body 2 through the loading portion 8.

  The heating burner 4 is fixed to the upstream end of the kiln main body 2 through the front wall 3 and radiates a flame into the kiln main body 2 from the front end along the longitudinal direction. The heating burner 4 in the present embodiment includes a flame length variable valve 5, and the flame length is adjusted by automatic control of the flame length variable valve 5. The heating burner 4 in the present embodiment is a known burner and will not be described in detail. However, the heating burner 4 is a multi-tube burner in which a plurality of fuel discharge ports are provided concentrically. From the side to the outer diameter side, a long flame fuel channel, a short flame fuel channel, and a combustion air channel are provided in the order described, and a flame length variable valve for a long flame and a flame for a short flame At least two fuel supply valves called variable length valves are provided, and further, an air valve for supplying combustion air is provided. Thereby, the heating burner 4 is configured so as to form at least a long flame and a short flame in the longitudinal direction of the main body kiln 4.

In the above configuration, for example, when performing a lime baking process, when a workpiece M containing calcium carbonate (CaCO ₃ ) is introduced into the kiln body 2 via the input unit 8, the kiln body 2 rotates. , Gradually moving from the upstream opening 6 side toward the downstream opening 7 side. Meanwhile, the workpiece M is heated by the heating burner 4 to be dried, combusted, and melted, while calcium carbonate (CaCO ₃ ) is converted into quick lime (CaO) by the firing reaction and discharged from the downstream opening 7. .

  A plurality of measurement points are set in the kiln main body 2 along the longitudinal direction, and temperature measuring means for measuring the temperature of each of the plurality of measurement points is provided. The range in which a plurality of measurement points are set in the kiln main body 2 is such that at least the peak temperature in the temperature distribution in the longitudinal direction of the kiln main body 2 is a plurality of measurements no matter how the flame length of the heating burner 4 is changed. The point is set to be within the set range. In the present embodiment, five measurement points of first to fifth measurement points P1 to P5 are set on the outer peripheral surface of the kiln main body 2 as a plurality of measurement points. And as a temperature measurement means, the five contact thermometers called the 1st-5th thermometers 11-15 are provided in each of the 1st-5th measurement points P1-P5. A reference temperature measurement point B as a location for measuring the reference temperature is set on the outer peripheral surface of the kiln body 2, and a reference thermometer 10 (contact thermometer) is provided at the reference temperature measurement point B. . In addition, even if the kiln main body 2 rotates, the contact thermometer and the reference thermometer 10 are configured so that the temperature is measured in a state of contacting the kiln main body 2 without rotating.

  In the present embodiment, the second measurement point P2, the fourth measurement point P4, the first measurement point P1, the third measurement point P3, the fifth measurement point P5, and the reference temperature measurement point B in order from the upstream side of the kiln body 2. Are set, and a second thermometer 12, a fourth thermometer 14, a first thermometer 11, a third thermometer 13, a fifth thermometer 15, and a reference thermometer 10 are provided at each of these measurement points. It has been.

  The reference temperature measurement point B is set at a position where a temperature change does not occur or does not substantially occur. In this embodiment, it is set at a position close to the downstream opening 7 of the kiln main body 2 and a temperature change hardly occurs even if the flame length of the heating burner 4 is changed. That is, the predetermined reference temperature is the temperature at the measurement point (reference temperature measurement point B) for measuring the temperature of the end of the kiln body 2 opposite to the heating burner 4.

  In the first to fifth measurement points P1 to P5 in this embodiment, even if the flame length of the heating burner 4 is increased or decreased, at least the peak temperature in the longitudinal temperature distribution of the kiln body 2 is the first. To the fifth measurement points P1 to P5 are set in the set range. The first to fifth measurement points P <b> 1 to P <b> 5 in the present embodiment are provided at equal intervals in the longitudinal direction of the kiln body 2. The first measurement point P1 is provided at a position where the furnace temperature becomes the highest when the flame length of the heating burner 4 is increased or in the vicinity thereof (a position where a hot spot is likely to be generated). P2 is provided at a position where the furnace temperature becomes the highest when the flame length of the heating burner 4 is shortened or in the vicinity thereof (a position where a hot spot is likely to be generated). The fourth measurement point P4 is provided at an intermediate position between the first measurement point P1 and the second measurement point P2, and the third measurement point P3 is provided downstream of the first measurement point P1. The fifth measurement point P5 is provided on the downstream side of the third measurement point P3.

  For example, when the first measurement point P1 is provided at a position 6 m away from the heating burner 4 and the second measurement point P2 is provided at a position 4 m away from the heating burner 4, the fourth measurement point P4 is heated. The third measurement point P3 is provided at a position 7 m away from the heating burner 4 and the fifth measurement point P5 is provided at a position 8 m away from the heating burner 4. become. In this case, the reference temperature measurement point B may be set at a position away from the heating burner 4 by, for example, about 12 m.

  Moreover, the rotary kiln furnace 1 according to the present embodiment includes a temperature measured at one predetermined measurement point among the first to fifth measurement points P1 to P5, and a reference temperature measured at the reference temperature measurement point B. When the difference in temperature falls within a predetermined temperature range, the flame length is adjusted by operating the flame length variable valve 5 of the heating burner 4 to change the temperature distribution in the kiln body 2. Control means (not shown).

(Control method of rotary kiln furnace)
FIG. 2 is a graph showing the relationship between the temperature in the rotary kiln furnace 1 and the distance from the heating burner 4.
As shown in FIG. 2, the present inventors have confirmed that the longitudinal temperature distribution (particularly the peak temperature) of the kiln main body 2 in the rotary kiln furnace 1 varies depending on the flame length of the heating burner 4. doing. Therefore, it is considered that the position of the heat spot portion generated on the inner peripheral surface of the kiln body 2 also changes as the flame length of the heating burner 4 changes.

FIG. 3 is a graph showing the relationship between the surface temperature of the kiln body 2 and the distance from the heating burner 4.
As shown in FIG. 3, the present inventors have confirmed that when the coaching occurs on the inner peripheral surface of the kiln body 2, the temperature of the surface portion of the kiln body 2 corresponding to the location where the coaching has occurred decreases. ing. In addition, the dotted line part in FIG. 3 has shown the temperature change assumed when the coaching has not arisen. That is, when coaching occurs, a drop in temperature clearly different from a normal temperature change (see the white arrow in FIG. 3) is observed.
In FIG. 2, the kiln body 2 has a total length of 12 m, an inner diameter of 3.0 m, a fuel flow rate in the heating burner 4 of 890 m ³ N / h, a fuel flow rate of about 260 m / s, and a fuel type of 13A. The air ratio was 1.3. In the main body kiln 2, it measured in the state which does not throw in a to-be-processed object.
In FIG. 3, the kiln main body 2 has an overall length of about 60 m and an inner diameter of 3.0 m, and the fuel flow rate in the heating burner 4 is about 500 L / h. The main body kiln 2 was measured in a state in which an object to be processed was put in, and the reaction of CaCO ₃ → CaO + CO ₂ occurred in the main body kiln 2.

  The control method of the rotary kiln furnace 1 according to the present invention is based on the above-mentioned knowledge by the present inventors, and the coaching is performed while measuring the surface temperature of the kiln body 2 and detecting the temperature change. When it is determined that there is a high possibility that it will be generated, the flame length of the heating burner 4 is changed to change the position of the heat spot portion to suppress the generation of coaching.

Examples of the control method when the above rotary kiln furnace 1 is used will be described below.
(First embodiment)
As shown in FIG. 4, the control means first ignites the heating burner 4 of the rotary kiln furnace 1 and starts operation. At this time, the flame length of the heating burner 4 is set to a long state.

  The control means makes a determination based on the temperature (Tp1) at the first measurement point P1 and the reference temperature (Tb) at the reference temperature measurement point B, and the difference (Tp1−Tb) between Tp1 and Tb is a predetermined threshold value (Tα). ), The flame length of the heating burner 4 is adjusted to be short.

  Here, the predetermined threshold value (Tα) is set based on the temperature change (ΔT) of the surface temperature of the kiln body 2 when the coaching is generated. For example, when the temperature change ΔT at the time of generating the coaching is 100 ° C., the predetermined threshold value (Tα) is desirably set to 50 ° C., which is approximately half the value.

  When the reference temperature (Tb) is 300 ° C. and the temperature (Tp 1) at the first measurement point P 1 when the coaching is not generated is 400 ° C., Tp 1 −Tb = 100 ° C.> Tα = 50 ° C. The flame length of the burner 4 is kept long.

  However, when the coaching is gradually generated and the temperature (Tp1) at the first measurement point P1 is decreased, for example, when Tp1 = 340 ° C., Tp1−Tb = 340 ° C.−300 ° C. = 40 ° C. In this case, since Tp1−Tb = 40 ° C. <Tα = 50 ° C., the control means operates the flame length variable valve 5 to shorten the flame length.

  Next, the control means makes a determination based on the temperature (Tp2) at the second measurement point P2 and the reference temperature (Tb) at the reference temperature measurement point B. At this time, if the difference (Tp2−Tb) between Tp2 and Tb is equal to or greater than a predetermined threshold value (Tα), the flame length of the heating burner 4 is kept short, but the predetermined threshold value (Tα). When it becomes less than, the control means stops the heating burner 4 and ends the operation of the rotary kiln furnace 1. And the removal operation | work of the coaching by an operator is implemented.

(Second embodiment)
As shown in FIG. 5, the control means first ignites the heating burner 4 of the rotary kiln furnace 1 and starts operation. At this time, the flame length of the heating burner 4 is set to a long state.

  The control means makes a determination based on the temperature (Tp1) at the first measurement point P1 and the reference temperature (Tb) at the reference temperature measurement point B, and the difference (Tp1−Tb) between Tp1 and Tb is a predetermined threshold value (Tα). ), The flame length of the heating burner 4 is adjusted to be short.

  Here, the predetermined threshold value (Tα) is set to 50 ° C., for example, as in the first embodiment. When the reference temperature (Tb) is 300 ° C. and the temperature (Tp 1) at the first measurement point P 1 when the coaching is not generated is 400 ° C., Tp 1 −Tb = 100 ° C.> Tα = 50 ° C. The flame length of the burner 4 is kept long.

  However, when the coaching is generated and the temperature (Tp1) at the first measurement point P1 decreases, for example, when Tp1 = 340 ° C., Tp1−Tb = 340 ° C.−300 ° C. = 40 ° C. In this case, since Tp1−Tb = 40 ° C. <Tα = 50 ° C., the control means operates the flame length variable valve 5 to shorten the flame length.

  Next, the control means makes a determination based on the temperature (Tp2) at the second measurement point P2 and the reference temperature (Tb) at the reference temperature measurement point B. At this time, if the difference (Tp2−Tb) between Tp2 and Tb is equal to or greater than a predetermined threshold value (Tα), the flame length of the heating burner 4 is kept short, but the predetermined threshold value (Tα). When the temperature is less than (within the predetermined temperature range), the control means operates the flame length variable valve 5 to increase the flame length.

  Next, the control means determines based on the temperature (Tp3) at the third measurement point P3 and the reference temperature (Tb) at the reference temperature measurement point B. At this time, if the difference between Tp3 and Tb (Tp3−Tb) is equal to or greater than a predetermined threshold value (Tα), the flame length of the heating burner 4 is maintained long, but the predetermined threshold value (Tα). When the temperature is less than (within a predetermined temperature range), the control means operates the flame length variable valve 5 to shorten the flame length.

  Next, the control means makes a determination based on the temperature (Tp4) at the fourth measurement point P4 and the reference temperature (Tb) at the reference temperature measurement point B. At this time, if the difference (Tp4−Tb) between Tp4 and Tb is equal to or greater than a predetermined threshold value (Tα), the flame length of the heating burner 4 is maintained short, but the predetermined threshold value (Tα). When the temperature is less than (within the predetermined temperature range), the control means operates the flame length variable valve 5 to increase the flame length.

  Next, the control means makes a determination based on the temperature (Tp5) at the fifth measurement point P5 and the reference temperature (Tb) at the reference temperature measurement point B. At this time, if the difference (Tp5−Tb) between Tp5 and Tb is equal to or greater than a predetermined threshold (Tα), the flame length of the heating burner 4 is maintained long, but the predetermined threshold (Tα) When the temperature is lower than the predetermined temperature range, the control means stops the heating burner 4 and ends the operation of the rotary kiln furnace 1. And the removal operation | work of the coaching by an operator is implemented.

(Third embodiment)
As shown in FIG. 6, the control means first ignites the heating burner 4 of the rotary kiln furnace 1 and starts operation. At this time, the flame length of the heating burner 4 is set to a long state.

  The control means makes a determination based on the temperature (Tp1) at the first measurement point P1 and the reference temperature (Tb) at the reference temperature measurement point B, and the difference (Tp1−Tb) between Tp1 and Tb is a predetermined threshold value (Tα). ), The flame length of the heating burner 4 is adjusted to be short.

  Here, the predetermined threshold value (Tα) is set to 50 ° C., for example, as in the first embodiment. When the reference temperature (Tb) is 300 ° C. and the temperature (Tp 1) at the first measurement point P 1 when the coaching is not generated is 400 ° C., Tp 1 −Tb = 100 ° C.> Tα = 50 ° C. The flame length of the burner 4 is kept long.

  However, when the coaching is generated and the temperature (Tp1) at the first measurement point P1 decreases, for example, when Tp1 = 340 ° C., Tp1−Tb = 340 ° C.−300 ° C. = 40 ° C. In this case, since Tp1−Tb = 40 ° C. <Tα = 50 ° C., the control means operates the flame length variable valve 5 to shorten the flame length.

  Next, the control means makes a determination based on the temperature (Tp2) at the second measurement point P2 and the reference temperature (Tb) at the reference temperature measurement point B. At this time, if the difference (Tp2−Tb) between Tp2 and Tb is equal to or greater than a predetermined threshold value (Tα), the flame length of the heating burner 4 is kept short, but the predetermined threshold value (Tα). When the temperature is less than (within the predetermined temperature range), the control means operates the flame length variable valve 5 to increase the flame length.

  Next, the control means makes a determination based on the temperature (Tp1) at the first measurement point P1 and the reference temperature (Tb) at the reference temperature measurement point B. At this time, if the difference between Tp1 and Tb (Tp1−Tb) is equal to or greater than a predetermined threshold value (Tα), the flame length of the heating burner 4 is maintained long, but the predetermined threshold value (Tα). When the temperature is less than (within a predetermined temperature range), the control means operates the flame length variable valve 5 to shorten the flame length.

  Next, the control means makes a determination based on the temperature (Tp2) at the second measurement point P2 and the reference temperature (Tb) at the reference temperature measurement point B. At this time, if the difference (Tp2−Tb) between Tp2 and Tb is equal to or greater than a predetermined threshold value (Tα), the flame length of the heating burner 4 is kept short, but the predetermined threshold value (Tα). When the temperature is less than (within the predetermined temperature range), the control means operates the flame length variable valve 5 to increase the flame length.

  Next, the control means makes a determination based on the temperature (Tp3) at the first measurement point P1 and the reference temperature (Tb) at the reference temperature measurement point B. At this time, if the difference between Tp3 and Tb (Tp3−Tb) is equal to or greater than a predetermined threshold value (Tα), the flame length of the heating burner 4 is maintained long, but the predetermined threshold value (Tα). When the temperature is lower than the predetermined temperature range, the control means stops the heating burner 4 and ends the operation of the rotary kiln furnace 1. And the removal operation | work of the coaching by an operator is implemented.

(Fourth embodiment)
As shown in FIG. 7, the control means first ignites the heating burner 4 of the rotary kiln furnace 1 and starts operation. At this time, the flame length of the heating burner 4 is set to a long state.

  The control means makes a determination based on the temperature (Tp1) at the first measurement point P1 and the reference temperature (Tb) at the reference temperature measurement point B, and the difference (Tp1−Tb) between Tp1 and Tb is a predetermined threshold value (Tα). ), The flame length of the heating burner 4 is adjusted to be short.

  Here, the predetermined threshold value (Tα) is set to 50 ° C., for example, as in the first embodiment. When the reference temperature (Tb) is 300 ° C. and the temperature (Tp 1) at the first measurement point P 1 when the coaching is not generated is 400 ° C., Tp 1 −Tb = 100 ° C.> Tα = 50 ° C. The flame length of the burner 4 is kept long.

  However, when the coaching is generated and the temperature (Tp1) at the first measurement point P1 decreases, for example, when Tp1 = 340 ° C., Tp1−Tb = 340 ° C.−300 ° C. = 40 ° C. In this case, since Tp1−Tb = 40 ° C. <Tα = 50 ° C., the control means operates the flame length variable valve 5 to shorten the flame length.

  Next, the control means makes a determination based on the temperature (Tp2) at the second measurement point P2 and the reference temperature (Tb) at the reference temperature measurement point B. At this time, if the difference (Tp2−Tb) between Tp2 and Tb is equal to or greater than a predetermined threshold value (Tα), the flame length of the heating burner 4 is kept short, but the predetermined threshold value (Tα). When the temperature is less than (within the predetermined temperature range), the control means operates the flame length variable valve 5 to increase the flame length.

  Next, the control means makes a determination based on the temperature (Tp1) at the first measurement point P1 and the reference temperature (Tb) at the reference temperature measurement point B. At this time, if the difference between Tp1 and Tb (Tp1−Tb) is equal to or greater than a predetermined threshold value (Tα), the flame length of the heating burner 4 is maintained long, but the predetermined threshold value (Tα). When the temperature is less than (within a predetermined temperature range), the control means operates the flame length variable valve 5 to shorten the flame length.

  Next, the control means makes a determination based on the temperature (Tp2) at the second measurement point P2 and the reference temperature (Tb) at the reference temperature measurement point B. At this time, if the difference (Tp2−Tb) between Tp2 and Tb is equal to or greater than a predetermined threshold value (Tα), the flame length of the heating burner 4 is kept short, but the predetermined threshold value (Tα). When the temperature is less than (within the predetermined temperature range), the control means operates the flame length variable valve 5 to increase the flame length.

  Next, the control means makes a determination based on the temperature (Tp1) at the first measurement point P1 and the reference temperature (Tb) at the reference temperature measurement point B. At this time, if the difference between Tp1 and Tb (Tp1−Tb) is equal to or greater than a predetermined threshold value (Tα), the flame length of the heating burner 4 is maintained long, but the predetermined threshold value (Tα). When the temperature is lower than the predetermined temperature range, the control means stops the heating burner 4 and ends the operation of the rotary kiln furnace 1. And the removal operation | work of the coaching by an operator is implemented.

(Other embodiments of the control method)
Although not shown in the drawings, the above second to fourth embodiments may be combined as other embodiments.
That is, in the scene where the difference between Tp3 and Tb (Tp3−Tb) in the second embodiment is determined, the difference between Tp1 and Tb (Tp1−Tb) is determined together with these two values. When it becomes less than a predetermined threshold value (Tα) (within a predetermined temperature range), the flame length is shortened. Furthermore, in the scene where the difference (Tp4-Tb) between Tp4 and Tb in the second embodiment is determined, the difference (Tp2-Tb) between Tp2 and Tb is determined together with these two values. When it becomes less than a predetermined threshold value (Tα) (within a predetermined temperature range), the flame length is increased. Furthermore, in the scene where the difference (Tp5-Tb) between Tp5 and Tb in the second embodiment is determined, the difference between Tp3 and Tb (Tp3-Tb) and the difference between Tp1 and Tb (Tp1- Tb) is determined, and when all these three values are less than a predetermined threshold value (Tα) (within a predetermined temperature range), the heating burner 4 is stopped.

  For example, in the scene where the difference (Tp3−Tb) between Tp3 and Tb in the second embodiment is determined, the coaching generated at the first measurement point P1 has already peeled off and the flame length is not shortened. A good situation can arise. Therefore, in this case, it is possible to operate for a longer period while keeping the flame length long. The same applies to the scene where the difference between Tp4 and Tb (Tp4-Tb) is determined and the scene where the difference between Tp5 and Tb (Tp5-Tb) is determined. A situation can arise where the length does not need to be changed.

  Therefore, according to the present Example, the stop frequency of the rotary kiln furnace accompanying the removal operation of coaching can be further reduced.

[Other Embodiments]
1. In the above-described embodiment, an example in which a contact thermometer is used as the temperature measurement unit has been described. However, the present invention is not limited to this, and for example, a radiation thermometer may be used as another temperature measurement unit.
2. In the above-mentioned embodiment, although the example which sets the reference temperature measurement point B to the kiln main body 2 was shown, it is not limited to this, For example, you may set room temperature to a reference temperature.
Further, the measurement value is not adopted as the reference temperature, and a predetermined reference temperature may be set in advance.
3. The number of measurement points and the set position are not limited to the above-described embodiment, and may be appropriately changed as necessary.
4). In the above-described embodiment, the configuration in which the flame length is adjusted in two stages of “long” and “short” is shown as an example, but the present invention is not limited to this. For example, the flame length may be set to “ A configuration may be adopted in which adjustment is performed in three stages of “long”, “medium”, and “short”, or more in four stages or more.

  Note that the configuration disclosed in the above embodiment can be applied in combination with the configuration disclosed in the other embodiments as long as no contradiction arises, and the embodiment disclosed in this specification is It is an illustration and the embodiment of the present invention is not limited to this, and can be appropriately modified without departing from the object of the present invention.

  The present invention can be suitably used in the technical field using a rotary kiln furnace.

DESCRIPTION OF SYMBOLS 1 Rotary kiln furnace 2 Kiln main body 3 Front wall 4 Heating burner 5 Flame length variable valve 6 Upstream opening part 7 Downstream opening part 8 Injection part 10 Reference | standard thermometers 11-15 The 1st-5th thermometer (temperature measurement means)
M workpiece B reference temperature measurement points P1 to P5 first to fifth measurement points (measurement points)

Claims (4)

A rotary kiln furnace comprising a kiln body and a heating burner,
At a plurality of measurement points set along the longitudinal direction of the kiln body, temperature measuring means for measuring the temperature of each of the plurality of measurement points;
When the difference between the temperature at one predetermined measurement point of the plurality of measurement points and a predetermined reference temperature is within a predetermined temperature range, the flame length of the heating burner is adjusted, A rotary kiln furnace comprising control means for controlling the temperature distribution in the kiln body to change.   2. The rotary kiln furnace according to claim 1, wherein the predetermined reference temperature is a temperature at a measurement point for measuring a temperature of an end portion of the kiln main body opposite to the heating burner. A method for controlling a rotary kiln furnace comprising a kiln body and a heating burner,
At a plurality of measurement points set along the longitudinal direction of the kiln body, a temperature measurement step of measuring the temperature of each of the plurality of measurement points;
When the difference between the temperature at one predetermined measurement point of the plurality of measurement points and a predetermined reference temperature is within a predetermined temperature range, the flame length of the heating burner is adjusted, And a control process for controlling the temperature distribution in the kiln main body to be changed.   After the control step is performed to adjust the flame length of the heating burner to change the temperature distribution in the kiln body, the temperature at another predetermined measurement point different from the one predetermined measurement point, When the difference from the predetermined reference temperature is within the predetermined temperature range, the flame length of the heating burner is adjusted again to control the temperature distribution in the kiln body. The control method of the rotary kiln furnace of Claim 3 characterized by these.

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