Rotary surface melting furnace and method for driving rotary surface melting furnace

Abstract

To provide a rotary surface melting furnace which can stably supply melting objects stored in a melting object storage part without causing the poor supply of the melting objects due to the adhesion and accumulation of the melting objects to a wall face.SOLUTION: A rotary surface melting furnace is configured in such a manner that an inner cylinder and an outer cylinder are concentrically arranged, a furnace chamber is formed at a space between a furnace ceiling and a furnace bottom part, and a melting object storage part is formed at a clearance between the inner cylinder and the outer cylinder, and comprises a cutting blade for supplying melting objects from the melting object storage part to the furnace chamber by relative rotation between the inner cylinder and the outer cylinder and a first cutting-down mechanism which is installed in the outer cylinder and is provided with a cutting-down rod for cutting down the melting objects adhered to and accumulated on the inner cylinder or the cutting blade with the relative rotation.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a rotary surface melting furnace and a method for operating the rotary surface melting furnace.

Background Art

[0002] Figs. 1(a) and (b) show a general rotary surface melting furnace 1. The rotary surface melting furnace 1 includes an inner cylinder 3 integrally formed around a furnace ceiling 2, and an outer cylinder 4 integrally formed around a furnace bottom 5 where a slag discharge port 6 is formed. The inner cylinder 3 is concentrically arranged inside the outer cylinder 4 such that the inner cylinder 3 is positioned inside the outer cylinder 4. A furnace chamber 7 is formed in the space between the furnace ceiling 2 and the furnace bottom 5, and a molten material accommodating portion 8 is formed in the gap between the inner cylinder 3 and the outer cylinder 4. The relative rotation of the inner cylinder 3 and the outer cylinder 4, specifically, the rotation of the outer cylinder 4 with respect to the fixed inner cylinder 3 by a drive mechanism 9, is configured to supply the molten material 10 from the molten material accommodating portion 8 to the furnace chamber 7. Note that the furnace ceiling 2 and the furnace bottom 5 are covered with refractory walls.

[0003] A cut-out blade 11 extends radially outward at the lower end of the inner cylinder 3, and is configured such that the molten material 10 is supplied from the molten material accommodating portion 8 to the furnace chamber 7 by the cut-out blade 11 as the inner cylinder 3 and the outer cylinder 4 rotate relative to each other. The structure of the cut-out blade is exemplified in, for example, Patent Document 1.

[0004] Three burners 12 for melting the molten material 10 guided into the furnace chamber 7 from the surface are arranged on the furnace ceiling 2, and the molten slag drips from the slag discharge port 6. The furnace ceiling 2 is configured to be vertically adjustable by drive mechanisms provided at three locations around the circumference according to the properties of the molten material 10 so that the melting surface of the molten material 10 is properly positioned.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] As shown in Fig. 2(a), the material to be melted 10 accommodated in the material-to-be-melted accommodating portion 8 is guided into the furnace chamber 7 by the cutting blades 11 installed at the lower end of the inner cylinder 3 as the outer cylinder 4 rotates, melts from the surface, and drips as molten slag from the tapping port 6.

[0007] However, when the material to be melted is ash with high wettability, as shown by the hatched portion R1 in Fig. 2(b), during furnace operation, the material to be melted 10 accommodated in the material-to-be-melted accommodating portion 8 tends to adhere to and accumulate on the wall surfaces of the outer cylinder 4 and the inner cylinder 3, making it difficult to stably supply the material to be melted 10 to the furnace chamber 7 by the cutting blades 11.

[0008] As a result, as shown by the white arrow in Fig. 3(a), the melting surface gradually retreats toward the material-to-be-melted accommodating portion 8 side, and the furnace bottom 5 is exposed and damaged. In particular, when the material to be melted 10 accumulates and solidifies on the upper part of the cutting blades 11, it grows into a donut-shaped mass as shown by the darkly hatched portion R2, and there is also a possibility that it becomes difficult to guide the material to be melted 10 to the furnace chamber 7 with the cutting blades 11.

[0009] Therefore, as shown in Fig. 3(b), a collapsing mechanism 14 provided with a collapsing rod 13 that can advance and retreat on the upper wall portion of the inner cylinder 3 of the material-to-be-melted accommodating portion 8 or on the inner cylinder 3 is installed, and by causing the collapsing rod 13 to advance and operate on the material to be melted, it is conceivable to cut and collapse the material to be melted 10 adhering to the inner wall of the outer cylinder 4 as the outer cylinder 4 rotates with the collapsing rod 13. However, since the inner cylinder 3 does not rotate, the material to be melted adhering to the inner cylinder 3 cannot be cut and collapsed by the collapsing rod 13.

[0010] An object of the present invention is, in view of the above-described problems, to provide a rotary surface melting furnace and a method for operating a rotary surface melting furnace that can stably supply the material to be melted without causing poor supply of the material to be melted due to adhesion and deposition of the material to be melted accommodated in the material-to-be-melted accommodating portion on the wall surface.

Means for Solving the Problems

[0011] To achieve the above object, a first characteristic configuration of the rotary surface melting furnace according to the present invention is that an inner cylinder integrally formed around the furnace ceiling and an outer cylinder integrally formed around the furnace bottom where a slag discharge port is formed are concentrically arranged. A furnace chamber is formed in the space between the furnace ceiling and the furnace bottom, and a molten material accommodating portion is formed in the gap between the inner cylinder and the outer cylinder. The rotary surface melting furnace is configured to supply the molten material from the molten material accommodating portion to the furnace chamber by the relative rotation of the inner cylinder and the outer cylinder, and includes a cutout blade extending radially outward at the lower end of the inner cylinder for supplying the molten material to the furnace chamber along with the relative rotation, and a first breaking mechanism installed on the outer cylinder and including a breaking rod for breaking the molten material adhering and depositing on the inner cylinder or the cutout blade along with the relative rotation.

[0012] The first breaking mechanism installed on the outer cylinder rotates integrally with the outer cylinder relative to the inner cylinder. Therefore, the breaking rod provided in the first breaking mechanism also moves in the circumferential direction relative to the inner cylinder, and the molten material adhering and depositing on the wall portion of the inner cylinder can be broken by the breaking rod.

[0013] A second characteristic configuration is that, in addition to the first characteristic configuration described above, the first breaking mechanism includes a plurality of breaking rods whose tip portions are located at positions having different heights from the furnace bottom.

[0014] Even when the range in the height direction of the molten material broken by one breaking rod is limited, by providing a plurality of first breaking mechanisms such that the tip portions of the breaking rods are located at positions having different heights from the furnace bottom, the range in the height direction of the molten material to be broken can be widened.

[0015] A third characteristic configuration is that, in addition to the first characteristic configuration described above, the first breaking mechanism includes a retracting and advancing mechanism that switches the posture between an advancing posture in which the breaking rod advances radially inward to break the molten material adhering and depositing on the inner cylinder or the cutout blade, and a retracting posture in which the breaking rod is retracted radially outside the cutout blade.

[0016] By means of the retracting and extending mechanism provided in the first collapsing mechanism, when it is necessary to collapse the molten material adhering and depositing on the cutting blade, the collapsing rod is extended, and when it is not necessary, the collapsing rod is retracted, so that an unnecessary load can be avoided from being applied to the rotating mechanism of the outer cylinder. Further, in the case where the height of the furnace ceiling with respect to the furnace bottom is variably adjusted, by retracting the collapsing rod, it is possible to avoid the inconvenience that the collapsing rod mechanically interferes with the cutting blade and is damaged.

[0017] The fourth characteristic configuration is that, in addition to the third characteristic configuration described above, it is provided with a control device that controls the retracting and extending mechanism based on the temperature near the cutting blade.

[0018] When the molten material adheres and deposits on the wall of the inner cylinder or the cutting blade, and the molten material guided into the furnace chamber decreases and the molten surface retreats toward the molten material accommodating portion side, the temperature near the cutting blade rises abnormally compared to normal. In such a case, the control device can appropriately collapse the deposited state of the molten material by causing the collapsing rod to extend by means of the retracting and extending mechanism provided in the first collapsing mechanism.

[0019] The fifth characteristic configuration is that, in addition to the third characteristic configuration described above, it is provided with a control device that controls the retracting and extending mechanism based on the rotational torque of the relative rotation.

[0020] When the molten material adheres and deposits on the wall of the inner cylinder or the cutting blade, the conveying force of the molten material by the cutting blade to the furnace chamber decreases, and the torque required for the relative rotation of the outer cylinder increases relatively. Therefore, based on the rotational torque of the relative rotation of the outer cylinder and the inner cylinder, when the torque increases, the control device can appropriately collapse the deposited state of the molten material by causing the collapsing rod to extend by means of the retracting and extending mechanism provided in the first collapsing mechanism.

[0021] The sixth characteristic configuration is that, in addition to the fourth or fifth characteristic configuration described above, it is provided with a lifting mechanism for adjusting the height of the furnace ceiling with respect to the furnace bottom, and before the control device extends the collapsing rod by means of the retracting and extending mechanism, it lowers the furnace ceiling by means of the lifting mechanism.

[0022] When the height of the furnace ceiling relative to the furnace bottom varies, the inner cylinder formed integrally with the furnace ceiling and the cut-out blades installed at the lower end of the inner cylinder also move up and down. Therefore, depending on the height of the furnace ceiling relative to the furnace bottom, there is a risk that the collapsing bar may mechanically interfere with the cut-out blades and cause damage. Even in such a case, by lowering the furnace ceiling by the lifting mechanism and then advancing the collapsing bar by the extending / retracting mechanism after the control device has done so, it is possible to prevent damage to the cut-out blades and the like.

[0023] The seventh characteristic configuration, in addition to the fourth or fifth characteristic configuration described above, includes a lifting mechanism for adjusting the height of the furnace ceiling relative to the furnace bottom, and when the control device advances the collapsing bar by the extending / retracting mechanism, among the extending / retracting mechanisms, the collapsing bar whose tip is at a position higher than the cut-out blades in the advanced posture is advanced.

[0024] By the control device grasping the height of the furnace ceiling and advancing the collapsing bar whose tip is at a position higher than the cut-out blades, it is possible to prevent damage to the cut-out blades and the like.

[0025] The eighth characteristic configuration, in addition to the first characteristic configuration described above, includes a second collapsing mechanism installed in the inner cylinder and having a collapsing bar for cutting and collapsing the molten material adhering and depositing on the outer cylinder as the outer cylinder rotates.

[0026] When molten material adheres and deposits on the outer cylinder, by providing a second collapsing mechanism in the inner cylinder and protruding the collapsing bar from the inner cylinder side to the outer cylinder side, the adhering deposits that rotate with the rotation of the outer cylinder can be cut and collapsed by the collapsing bar.

[0027] The first characteristic configuration of the operation method of the rotary surface melting furnace according to the present invention is an operation method of a rotary surface melting furnace having the third characteristic configuration described above, and when a temperature rise indicating the retreat of the melting surface of the molten material is detected using the temperature in the vicinity of the cut-out blades as an index, the collapsing bar is advanced.

[0028] The second characteristic configuration is an operation method of a rotary surface melting furnace having the third characteristic configuration described above. When an increase in torque indicating that the molten material has adhered and accumulated on the inner cylinder or the cutting blade is detected using the rotational torque of the relative rotation as an index, the crushing rod is advanced.

Advantages of the Invention

[0029] As described above, according to the present invention, it has become possible to provide a rotary surface melting furnace and an operation method of a rotary surface melting furnace that can stably supply the molten material without causing poor supply of the molten material due to adhesion and accumulation of the molten material on the wall surface of the molten material storage section.

Brief Description of the Drawings

[0030]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0031] Hereinafter, embodiments of the surface melting furnace and the operation method of the surface melting furnace according to the present invention will be described. As shown in FIGS. 1(a) and 1(b), the rotary surface melting furnace 1 includes an inner cylinder 3 integrally formed around the furnace ceiling 2, and an outer cylinder 4 integrally formed around the furnace bottom 5 where the slag discharge port 6 is formed. The inner cylinder 3 is concentrically arranged inside the outer cylinder 4 such that the furnace chamber 7 is formed in the space between the furnace ceiling 2 and the furnace bottom 5, and the molten material accommodating portion 8 is formed in the gap between the inner cylinder 3 and the outer cylinder 4. The furnace ceiling 2 and the furnace bottom 5 are covered with refractory walls, and a cooling water flow path is formed inside.

[0032] The relative rotation of the inner cylinder 3 and the outer cylinder 4, specifically, the outer cylinder 4 rotates relative to the fixed inner cylinder 3 by the drive mechanism 9 to supply the molten material 10 from the molten material accommodating portion 8 to the furnace chamber 7.

[0033] As shown in FIG. 5(b), a plurality of cutting blades 11 are installed at equal intervals at the lower part of the inner cylinder 3. The cutting blades 11 include a first cutting blade 11A whose tip projects radially outward from the outer periphery of the inner cylinder 3, and a second cutting blade 11B whose tip retreats slightly radially inward from the outer periphery of the inner cylinder 3. As the outer cylinder 4 rotates relative to the inner cylinder 3, the molten material 10 accommodated in the molten material accommodating portion 8 is guided toward the furnace chamber by the cutting blades 11.

[0034] Three burners 12 are arranged on the furnace ceiling 2. The molten material 10 guided into the furnace chamber 7 is melted from the surface by the heat of the burners 12, and the molten slag drips from the slag discharge port 6. The furnace ceiling 2 is configured to be vertically adjustable by the drive mechanisms provided at four locations around according to the properties of the molten material 10 so that the melting surface of the molten material 10 gently slopes toward the slag discharge port 6.

[0035] As described with reference to FIG. 2(b), when the material to be melted is highly wettable ash or the like, during the furnace operation, the material to be melted 10 accommodated in the material to be melted accommodating portion 8 adheres to and accumulates on the wall surfaces of the outer cylinder 4 and the inner cylinder 3 (hatched portion R1 with diagonal lines), making it difficult to stably supply the material to be melted 10 to the furnace chamber 7 by the cutting blades 11. In particular, when the material to be melted 10 accumulates and solidifies on the upper part of the cutting blades 11, it grows into a doughnut-shaped mass (heavily hatched portion R2), making it difficult to guide the material to be melted 10 to the furnace chamber 7 with the cutting blades 11.

[0036] Therefore, as shown in FIGS. 5(a) and 6(a) to (d), four first breaking mechanisms 16 (16A, 16B, 16C, 16D) for breaking up the material to be melted adhering and accumulating on the inner cylinder 3 or the cutting blades 11 are installed on the outer cylinder 4 at equal intervals.

[0037] With the breaking rods 15 (15A, 15B, 15C, 15D) provided in each of the first breaking mechanisms 16 (16A, 16B, 16C, 16D) that rotate integrally with the rotation of the outer cylinder 4, the material to be melted adhering and accumulating on the inner cylinder 3 or the cutting blades 11 is broken up.

[0038] The hatching indicated by reference numeral 11 in FIGS. 6(a) to (d) shows the position of the cutting blades when the height of the furnace ceiling 2 adjusted by the elevating mechanism is at the lowest position from the furnace bottom 5, and the hatching indicated by reference numeral 11' shows the position of the cutting blades when the height of the furnace ceiling 2 adjusted by the elevating mechanism is at the highest position from the furnace bottom 5. Also, FIG. 6(a) shows the first breaking mechanism 16A, FIG. 6(b) shows the first breaking mechanism 16B, FIG. 6(c) shows the first breaking mechanism 16C, and FIG. 6(d) shows the first breaking mechanism 16D. The heights h1 to h4 of the tip ends of the respective breaking rods 15A to 15D from the furnace bottom 5 are such that the height h1 of the breaking rod 15A is the lowest, increasing in order, and the height h4 of the breaking rod 15D is at the highest position (h1 < h2 < h3 < h4).

[0039] As shown in FIGS. 6(a) to (d), the crushing rods 15A, 15B, and 15C are in the extended position advancing from the first crushing mechanism 16 and are at the height of the lifting range of the cutting blade 11. Therefore, in order to avoid mechanical interference with the cutting blade 11, they are configured to be able to switch their posture between an extended posture advancing radially inward from the outer cylinder 4 and a retracted posture retracting radially outward. Note that since the crushing rod 15D does not mechanically interfere with the cutting blade 11, it is fixed in the extended position at all times.

[0040] FIGS. 4(a) to (e) show the advancing / retracting mechanism of the crushing rod 15A by the first crushing mechanism 16A. Since the advancing / retracting mechanisms of the first crushing mechanisms 16B and 16C are the same, the description thereof is omitted. The first crushing mechanism 16A includes a cylindrical holding cylinder 17A that holds the cylindrical crushing rod 15A so as to be able to advance and retract, an operating rod 18A that moves the crushing rod 15A forward and backward with respect to the holding cylinder 17A, and a support frame 19A that rotatably supports the operating rod 18A.

[0041] The holding cylinder 17A is bolt-fixed at the flange portion 20F via a mounting bracket 20A welded to the outer cylinder 4. A hollow portion 15H having an internal thread portion formed on the inner circumference is provided on the proximal end side of the crushing rod 15A, and it is screwed with the external thread portion formed on the outer circumference of the operating rod 18A. By rotating the operating rod 18A supported by the support frame 19A clockwise, the crushing rod 15A advances, and by rotating it counterclockwise, the crushing rod 15A retracts. A scale SC is provided on the support frame 19A, and by rotating the operating rod 18A while checking the proximal end position of the crushing rod 15A with the scale SC, the crushing rod 15A can be accurately advanced to the desired advancing position.

[0042] Sliding portions 17G for supporting the operating rod 18A are provided inside the proximal end side and the other end side of the holding cylinder 17A, and a lubricating oil supply path P3 connecting between the sliding portions 17G is formed. The lubricating oil supplied from the input port P1 on the proximal end side is supplied to the sliding portion from the output port P2 on the distal end side via the supply path, so that the operating rod 18A can smoothly advance and retract.

[0043] As shown in FIG. 4(e), on the tip side of the breaking bar 15A, a convex portion 15F is formed, the peripheral surface of which is machined by cutting and intersects at an angle of about 90° with a plane that intersects, in order to break up the molten material deposited on the inner cylinder 3 or the cutting blades 11 as the outer cylinder 4 rotates.

[0044] FIG. 4(f) shows the support mechanism of the breaking bar 15D by the first breaking mechanism 16D shown in FIG. 6(d). The first breaking mechanism 16D includes a support portion 22 that supports the cylindrical breaking bar 15D, and a cylindrical holding cylinder 17A that holds the support portion 22 in an insertable manner. The holding cylinder 17A is bolt-fixed at the flange portion 20F via a mounting bracket 20A welded to the outer cylinder 4. In this embodiment, since the holding cylinder 17A is attached to the inclined portion of the outer cylinder 4 in an inclined posture obliquely upward, the breaking bar 15D is attached to the support portion 22 in a bent posture so that the breaking bar 15D is in a horizontal posture, but the present invention is not limited to such a configuration. Note that the cross-section of the breaking bar 15D is the same as that shown in FIG. 4(e).

[0045] FIG. 4(a) shows an example in which, as described in FIG. 3(b), the second breaking mechanisms 14A and 14B including the upper wall portion of the inner cylinder 3 of the molten material storage portion 8 and the breaking bar 13 that can be advanced and retracted with respect to the inner cylinder 3 are installed. By causing the breaking bar 13 to advance into the molten material, the molten material 10 adhering to the inner wall of the outer cylinder 4 as the outer cylinder 4 rotates is broken up by the breaking bar 13. Although the advancing / retracting mechanism provided in the second breaking mechanisms 14A and 14B will not be described in detail, it can be configured in the same manner as the advancing / retracting mechanism provided in the first breaking mechanism 16 described above. As shown in FIG. 5(b), four mounting seats 23 of the second breaking mechanism 14B are provided at equal intervals in the circumferential direction.

[0046] As described above, in the rotary surface melting furnace according to the present invention, an inner cylinder integrally formed around the furnace ceiling and an outer cylinder integrally formed around the furnace bottom where the slag discharge port is formed are arranged concentrically, a furnace chamber is formed in the space between the furnace ceiling and the furnace bottom, a molten material storage portion is formed in the gap between the inner cylinder and the outer cylinder, and the molten material is configured to be supplied from the molten material storage portion to the furnace chamber by the relative rotation of the inner cylinder and the outer cylinder. And, a cutting blade that extends radially outward at the lower end of the inner cylinder and supplies the molten material to the furnace chamber as it rotates relative to the outer cylinder, and a breaking rod that is installed on the outer cylinder and breaks up the molten material that adheres and accumulates on the inner cylinder or the cutting blade as it rotates relative to the outer cylinder are provided.

[0047] Preferably, a plurality of first breaking mechanisms are provided such that the tip ends of the breaking rods are located at positions having different heights from the furnace bottom. Even when the height range of the molten material broken up by one breaking rod is limited, by providing a plurality of first breaking mechanisms such that the breaking rods are located at positions having different heights from the furnace bottom, the height range of the molten material to be broken up can be widened.

[0048] Preferably, the first breaking mechanism includes a retracting mechanism that switches between a protruding posture in which the breaking rod protrudes radially inward to break up the molten material that adheres and accumulates on the inner cylinder or the cutting blade, and a retracting posture in which the breaking rod is retracted radially outside the cutting blade. By switching the breaking rod to the retracting posture, it is possible to avoid applying an unnecessary load to the rotation mechanism of the outer cylinder. Also, when the height of the furnace ceiling relative to the furnace bottom is variably adjusted, it is possible to avoid an inconvenience such that the breaking rod mechanically interferes with the cutting blade and is damaged by retracting the breaking rod.

[0049] Preferably, a temperature sensor such as a thermocouple is arranged near the cutting blade, and a control device is provided that controls the retracting mechanism using the temperature measured by the temperature sensor as an index. When the molten material adheres and accumulates on the wall of the inner cylinder or the cutting blade, and the molten material guided into the furnace chamber decreases and the melting surface retreats toward the molten material storage section side, normally, the temperature maintained in the range of 30°C to 50°C is affected by the temperature of the furnace chamber, which becomes as high as 1300°C, and tends to spike to a temperature of around 100°C. In such a case, by causing the retracting mechanism to cause the breaking rod to protrude and operate, the accumulated state of the molten material can be appropriately collapsed. The temperature sensor may be attached at around four locations near the cutting blade so as to be evenly spaced in the circumferential direction at the lower end of the inner cylinder 3.

[0050] The operation monitor may manually operate the loading and unloading mechanism shown in Fig. 4 using the temperature measured by the temperature sensor. However, instead of the manual operation by the operating rod 18A shown in Fig. 4, a loading and unloading mechanism may be configured to move the collapsing rod 15 in and out using a hydraulic motor or the like as an actuator, and it is preferable to include a control device that automatically operates the actuator using the temperature measured by the temperature sensor as an indicator.

[0051] Further, a control device may be provided that detects the rotational torque of the outer cylinder 4 by the rotation mechanism using a sensor and controls the loading and unloading mechanism using the detected rotational torque as an indicator. When the molten material adheres to and accumulates on the wall of the inner cylinder or the cutting blades, the conveying force of the molten material to the furnace chamber by the cutting blades decreases, and the torque required for the relative rotation of the outer cylinder increases relatively. Therefore, using the rotational torque of the relative rotation between the outer cylinder and the inner cylinder as an indicator, when the torque increases, the control device advances the collapsing rod by the loading and unloading mechanism provided in the first collapsing mechanism, so that the accumulated state of the molten material can be appropriately collapsed. Then, when the torque decreases thereafter, the collapsing rod may be configured to retract, or the collapsing rod may be configured to retract when the relative rotational speed of the outer cylinder and the inner cylinder has elapsed a predetermined number. The torque threshold for advancing the collapsing rod and the torque threshold for retracting the collapsing rod are not particularly limited and may be set as appropriate.

[0052] When a lifting mechanism for adjusting the height of the furnace ceiling with respect to the furnace bottom is provided, it is preferable that the control device lowers the furnace ceiling by the lifting mechanism before advancing the collapsing rod by the loading and unloading mechanism.

[0053] When the height of the furnace ceiling with respect to the furnace bottom fluctuates, the inner cylinder formed integrally with the furnace ceiling and the cutting blades installed at the lower end of the inner cylinder also fluctuate up and down. Therefore, depending on the height of the furnace ceiling with respect to the furnace bottom, there is also a risk that the collapsing rod may mechanically interfere with the cutting blades and be damaged. Even in such a case, by advancing the collapsing rod by the loading and unloading mechanism after the control device lowers the furnace ceiling by the lifting mechanism, damage to the cutting blades and the like can be prevented.

[0054] When there is a lifting mechanism for adjusting the height of the furnace ceiling with respect to the furnace bottom, it is preferable that the control device selectively advances the collapsing rod having a tip portion at a position higher than the cutting blades when advancing the collapsing rod by the advancing / retreating mechanism.

[0055] By the control device grasping the height of the furnace ceiling and advancing the collapsing rod having a tip portion at a position higher than the cutting blades, it is possible to prevent damage to the cutting blades and the like in advance.

[0056] Also, as shown in Fig. 4(a), it is preferable to provide a second collapsing mechanism including a collapsing rod that is installed in the inner cylinder and cuts and collapses the molten material that adheres and accumulates on the outer cylinder as it rotates relatively.

[0057] When the molten material adheres and accumulates on the outer cylinder, by providing the second collapsing mechanism on the inner cylinder and protruding the collapsing rod from the inner cylinder side to the outer cylinder side, the adhering and accumulated material that rotates with the rotation of the outer cylinder can be cut and collapsed by the collapsing rod.

[0058] As described above, the operation method of the rotary surface melting furnace according to the present invention is configured to advance the collapsing rod when detecting the retreat of the melting surface of the molten material using the temperature near the cutting blades as an index.

[0059] Also, it is preferably configured to advance the collapsing rod when detecting that the molten material has adhered and accumulated on the inner cylinder or the cutting blades using the rotational torque of the relative rotation as an index.

[0060] The transmission and reception of signals between the control device and the sensor provided on the inner cylinder, and between the control device and the advancing / retreating mechanism provided on the outer cylinder can be realized via a wireless communication interface. Also, a strip-shaped electrode for sending and receiving signals may be arranged around the rotating outer cylinder, and a terminal that makes sliding contact with the electrode may be connected to a control device installed externally.

[0061] The number of collapsing rods is not limited to each of the above-described embodiments, and may be further increased or decreased. Also, the collapsing rod 15 of the first collapsing mechanism 16 may be configured to advance and retreat obliquely downward.

[0062] Each of the above-described embodiments is merely an example of the present invention, and the specific configuration of each part can be appropriately changed and designed within the scope where the effects of the present invention are achieved.

Explanation of Reference Numerals

[0063] 1: Rotary surface melting furnace 2: Furnace ceiling 3: Inner cylinder 4: Outer cylinder 5: Furnace bottom 6: Slag discharge port 7: Furnace chamber 8: Melted material storage part 10: Melted material 11: Cutting blade 13: Collapsing rod 14: Second collapsing mechanism 15: Collapsing rod 16: First collapsing mechanism

Claims

1. An internally disposed cylinder integrally formed around the furnace ceiling, and an externally disposed cylinder integrally formed around the furnace bottom where a slag discharge port is formed, are concentrically arranged. A furnace chamber is formed in the space between the furnace ceiling and the furnace bottom, and a molten material storage portion is formed in the gap between the internally disposed cylinder and the externally disposed cylinder. The rotary surface melting furnace is configured such that the molten material is supplied from the molten material storage portion to the furnace chamber by the relative rotation of the internally disposed cylinder and the externally disposed cylinder, a cut-out blade extending radially outward at the lower end of the internally disposed cylinder, and configured to supply the molten material to the furnace chamber as the relative rotation occurs, a first breaking mechanism installed on the externally disposed cylinder, and including a breaking bar configured to break up the molten material adhering and depositing on the internally disposed cylinder or the cut-out blade as the relative rotation occurs, characterized by comprising the above components.

2. The rotary surface melting furnace according to claim 1, wherein the first breaking mechanism includes a plurality of breaking bars with their tip ends positioned at different heights from the furnace bottom.

3. The rotary surface melting furnace according to claim 1, wherein the first breaking mechanism includes a retraction and extension mechanism that switches between an extended position where the breaking bar is advanced radially inward to break up the molten material adhering and depositing on the internally disposed cylinder or the cut-out blade, and a retracted position where the breaking bar is retracted radially outside the cut-out blade.

4. The rotary surface melting furnace according to claim 3, further comprising a control device configured to control the retraction and extension mechanism based on the temperature in the vicinity of the cut-out blade.

5. The rotary surface melting furnace according to claim 3, further comprising a control device configured to control the retraction and extension mechanism based on the rotational torque of the relative rotation.

6. The rotary surface melting furnace further comprises a lifting mechanism configured to adjust the height of the furnace ceiling relative to the furnace bottom, and the control device is configured to lower the furnace ceiling by the lifting mechanism before advancing the breaking bar by the retraction and extension mechanism, according to claim 4 or 5.

7. The rotary surface melting furnace further comprises a lifting mechanism configured to adjust the height of the furnace ceiling relative to the furnace bottom, and the control device is configured to advance the breaking bar with its tip end at a position higher than the cut-out blade in the extended position among the breaking bars of the retraction and extension mechanism when advancing the breaking bar by the retraction and extension mechanism, according to claim 4 or 5.

8. The rotary surface melting furnace according to claim 1, further comprising a second breaking mechanism installed on the internally disposed cylinder, and including a breaking bar configured to break up the molten material adhering and depositing on the externally disposed cylinder as the relative rotation occurs.

9. The operating method of the rotary surface melting furnace according to claim 3, wherein when a temperature rise indicating the recession of the melting surface of the material to be melted is detected using the temperature in the vicinity of the cut-out blade as an index, the operating method of the rotary surface melting furnace in which the collapsing rod is advanced.

10. The operating method of the rotary surface melting furnace according to claim 3, wherein when an increase in torque indicating that the material to be melted has adhered and deposited on the inner cylinder or the cut-out blade is detected using the rotational torque of the relative rotation as an index, the operating method of the rotary surface melting furnace in which the collapsing rod is advanced.

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