JPH06294582A - Lateral rotary furnace - Google Patents

Abstract

PURPOSE:To provide a lateral rotary furnace with a high heat efficiency, which can be continuously operated even under a high temperature. CONSTITUTION:The title lateral rotary furnace is equipped with a cylindrical body 1 which is mainly made of a heat-resistant material, has an axis 3 being substantially horizontal or slightly tilted to horizontal, and in which a space for an object to be heated to be input is formed, a plurality of supporting axial bodies 2 which have an axis to be substantially in parallel with the axis 3 of the cylindrical body 1, come into contact with the outside of the cylindrical body 1, and rotatably support the cylindrical body 1, and a heater 6 to heat the cylindrical body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-resistant cylindrical rotary type horizontal rotary furnace for heating a high-purity, high-quality powdery or granular material to be heated to a high temperature.

[0002]

2. Description of the Related Art Conventionally, a crucible has been known as an apparatus for heating a high-purity, high-quality powdery granular material to be heated to a high temperature to obtain a product. The crucible for such an application is obtained by melt-molding the same or equivalent material as the above-mentioned object to be heated, and the crucible for accommodating the above-mentioned object to be heated is a state in which the object to be heated forms a stationary layer in the crucible. It is placed in a stationary electric furnace for a predetermined time. Thus, when the object to be heated is heated in the furnace for a predetermined time to reach a high temperature, the crucible is taken out of the furnace and cooled. Thus,
The object to be heated is taken out from the crucible as a product after cooling.

[0003]

However, the above-mentioned technique by the crucible has the following problems.

The solid powdery and granular material to be heat-filled in the crucible has a small thermal conductivity as a layer because it has voids between the powdery and granular materials. Therefore, the central portion of the material to be heated in the crucible is The heating time is, for example, 10 to 20 to reach a predetermined high temperature.
It also takes time, the amount of heat radiated from the outer surface of the device is large, and a large amount of energy is lost.

The crucible is usually placed on a trolley made of refractory, sent into the furnace, and the object to be heated is heated to a predetermined high temperature and then withdrawn from the furnace, and then cooled. A large amount of heat energy is required, and the power required for the product per unit weight becomes large.

Further, in order to obtain a high quality product, it is often required to heat the object to be heated to a temperature close to the softening temperature, and the object to be heated forms a stationary layer in the crucible. Together with this, the object to be heated is likely to condense in the crucible and adhere to the crucible. In this case, at the same time, softening of the crucible itself easily occurs, which causes deformation of the crucible and reduces workability.

Further, when the above crucible is used, there is a problem that the operation for inserting and taking out the furnace is a so-called batch method, stable operation cannot be performed for a long time, the thermal efficiency is low, and the productivity is not good. is there.

The present invention solves the above-mentioned problems associated with the prior art, and when heating a high-purity, high-quality powder-granulated object to a high temperature, the object is condensed and fixed and the apparatus is deformed. It is an object of the present invention to provide a horizontal rotary furnace capable of continuously performing a stable operation with high thermal efficiency without causing heat generation.

[0009]

According to the present invention, the above object is to introduce a powdery or granular material to be heat-insulated into an inside having an axis which is mainly made of a heat-resistant material and which is substantially horizontal or slightly inclined with respect to the horizontal. A tubular body in which a possible space is formed, and a plurality of supporting shafts having an axis substantially parallel to the axis of the tubular body and circumscribing the tubular body to rotatably support the tubular body When,
This is achieved by including a heating body that heats the tubular body.

[0010]

In the present invention having such a structure, the solid powdery and granular material to be heated is continuously charged into the cylindrical body. The tubular body is being heated by the heating body and is rotating around the axis, and the object to be heated in the tubular body rises in the circumferential direction on the inner wall of the tubular body while being heated via the tubular body. It moves, falls to some extent, then falls, forms a circulating flow, and moves toward the discharge port in this state. Thus, the object to be heated is heated uniformly. The object to be heated does not coagulate because it is constantly moving, and it does not adhere to the tubular body because it moves relative to the tubular body.

On the other hand, the tubular body may be softened because it is heated to a high temperature, but since it rotates while being supported by the support shaft, for example, even if a specific portion is deformed at a certain moment, At the next moment, this site is moving, so no deformation occurs. The support shaft supports the tubular body over substantially the entire length of the tubular body, and since the tubular body rotates about the axis, the outer surface of the tubular body is uniformly supported. In this respect as well, it is possible to prevent deformation of only a specific part.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a vertical sectional view of an apparatus according to an embodiment of the present invention,
FIG. 2 is a sectional view taken along line II-II in FIG.

In the figure, a cylindrical body 1 made of a heat-resistant material is supported by a plurality of shaft supports 2 so as to be rotatable around an axis 3. In FIG. 1, the tubular body 1 is formed to have a small diameter at the left end forming the inlet of the object to be heated, but the shape of the both ends is not limited to this, and the shape of both ends is arbitrary. For example, as shown by the chain double-dashed line in FIG. 1, the right end forming a discharge port from which a heat-treated object is heated and taken out as a product may have a small diameter similarly to the left end.

The powder or granular material which is the object to be heated is fed into the tubular body 1 from the left end of the tubular body 1, and the bottom portion of the tubular body 1 is caused by the action of rotation of the tubular body 1 around the axis line 3. While rolling at 4, it advances to the right in FIG. 1, and is discharged from the right end side. The axis 3 may be substantially horizontal or may be slightly inclined with respect to the horizontal plane.

The tubular body 1 is housed in a furnace body 5 which is made of a heat resistant material and, if necessary, a heat insulating material. The furnace body 5 is installed immovably and has a space in the radial direction between itself and the cylindrical body 1. The heating elements 6 are provided at a plurality of positions in the circumferential direction in the space. In the illustrated example, the heating body 6 has the axis line of the heating body 6 substantially parallel to the axis line 3 of the cylindrical body, but is not necessarily limited to this, and is arranged, for example, orthogonal to the axis line 3. The heating element may be a heating element, and the heating element is not limited to electric power, and may be a high-temperature flame or combustion gas resulting from combustion of fuel as a thermal energy source. When using such a heat energy source, the heating body 6 is removed, and the flame or combustion gas is caused to flow in the annular space between the furnace body 5 and the tubular body 1.

As shown in FIG. 2, the tubular body 1 is in the furnace body 5 and is a material having heat resistance and high strength.
For example, it is made of a material such as carbon dam and placed on a plurality of support shafts 2 having a cylindrical outer peripheral surface extending parallel to the axis 3 of the cylindrical body 1, and the support shafts 2 rotate. It receives a driving force and rotates about the axis 3. At this time, a transmission means such as a gear may be provided between the support shaft body 2 and the cylindrical body 1 in order to ensure the transmission of the rotational driving force. Further, when the tubular body 1 is directly driven to rotate, it is sufficient that the support shaft body 2 can be driven and rotated by the tubular body 1. Two support shafts 2 are usually sufficient, but three or more support shafts 2 may be used if necessary.

In the apparatus of this embodiment, the heating element 6
The heat energy generated from the heats the outer surface of the tubular body 1,
The heat is transmitted to the powdery and granular object 7 to be contacted with the inner surface of the cylindrical body 1. Since the tubular body 1 rotates as shown in FIG. 2,
Along with the rotation, the object to be heated 7 moves upward along the inner surface of the cylindrical body 1, and when it rises to a certain extent, it drops to form a circulating flow. While the object 7 to be heated is uniformly heated by such circulation, it advances to the downstream side and is taken out as a product from the discharge port.

On the other hand, the plurality of support shafts 2 circumscribe and support the cylindrical body 1 in a line contact state over a wide range in the axial direction. Then, as the tubular body 1 rotates, the tubular body 1
The position of the above line contact on the outer peripheral surface of is moved in the circumferential direction. Therefore, the cylindrical body 1 supported in a wide range in the axial direction hardly bends even in the softened state, and even if some bending occurs, its circumferential position always moves, so that It will be corrected. Further, since the cylindrical body 1 and the supporting shaft body 2 are in line contact with each other and the contact area is small, the heat from the cylindrical body 1 to the supporting shaft body 2 escapes little.

When it is necessary to prevent the radiation heat transfer from the heating body 6 to the support shaft body 2, as shown by the chain double-dashed line in FIG. be able to.

When the materials of the cylindrical body 1 and the supporting shaft body 2 which are exposed to high temperature are different, an unfavorable chemical reaction phenomenon such as diffusion of trace components may occur. Since such a phenomenon causes corrosion and the like, it is desirable to avoid it.
In this case, the above phenomenon is caused by stacking a cylinder 9 made of the same material as the tubular body 1 on the outer peripheral surface of the support shaft body 2 made of a heat resistant and strong material as shown in FIG. Can be avoided. In FIG. 3, 10 is a cushion material having heat resistance.

It is desirable that the support shaft 2 be maintained in a state where its strength is always high. For that purpose, it is preferable that the support shaft 2 can be cooled. FIG. 4 shows an example of such a case. In this example, the metal tube 1 serving as the core metal of the support shaft body 2 is shown.
1 and a circular tube 9 made of a heat-resistant material on the outside are filled with a material 12 having high heat resistance and heat insulation so as to support the circular tube 9 and keep the temperature of the metal tube 11 below an allowable value. ing. Then, air is circulated through the inside 13 of the metal tube 11 to cool the support shaft body 2.

The supporting shaft may be a simple cylindrical one having the same diameter over the entire length, but in that case, the cylindrical body can be gradually moved in the lateral direction (axial direction) by the rotation of the cylindrical body. There is a nature. In order to prevent this and rotate while maintaining the regular position, for example, as shown in FIG. 5, small diameter portions 1A and 1B are provided at one end or both ends of the tubular body 1, while the support shaft body 2 is provided. Is the small diameter portion 1A, 1
By providing the large diameter portions 2A and 2B that circumscribe in correspondence with B, it is possible to prevent the axial displacement of the tubular body 1 due to rotation.

According to the apparatus shown in FIG. 1, when the powdery or granular material to be heated is constantly and continuously fed into the cylindrical body 1 from the left end, after being retained in the cylindrical body 1 for a predetermined time. , Can be discharged continuously from the right end. However, the residence time distribution characteristics of each granular material are not always the same due to differences in particle size, shape, etc. Therefore, even if the average residence time is always the same, the obtained product is It is not always homogeneous. Further, when it is desired to make the residence time longer or shorter than the predetermined residence time obtained in the state of the apparatus of FIG. 1, a control member for regulating movement or promoting movement can be provided. As shown in FIG. 6, the control member 14 is configured to rotate together with the tubular body 1, and a plurality of notched discs 16 parallel to each other are attached to the shaft body 15. The notched portions 16A of each notched disc 16 are For example, they come alternately on the opposite side in the radial direction. The object to be heated moves to the downstream side through the cutout portion 16A in the tubular body 1, but the movement is regulated by the notch disk 16, and the object to be heated stays in each powder particle for a predetermined period of time. 7. FIG. 7 is an overall perspective view of the control member 14.

The control member is not limited to those shown in FIGS. 6 and 7. For example, as shown in FIG. 8, the control member 14A divides the inside of the tubular body 1 into two spaces by a partition wall 17 parallel to a surface including the axis 3 of the tubular body 1, and divides both sides of the partition wall 17 into two spaces. It is also possible to provide a guide plate 18 that is inclined to the bottom. In this case, the partition wall 17 is the tubular body 1.
Since the object to be heated located on one surface of the partition wall 17 slides down along the guide plate 18 when rotated together, the residence time in the tubular body 1 becomes a predetermined length. As shown in FIG. 8, if the guide plates 18 on both sides of the partition wall 17 are oriented in the same direction when both sides face in one direction, the objects to be heated in the two spaces of the tubular body 1 are If it moves in the same direction and in the opposite direction, the movement forms a circulating flow in the tubular body and is discharged little by little. The inclination angle of the guide plate is arbitrary and may be vertical.

[0026]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, a powdery or granular material to be heated is rolled and heated in a rotating cylindrical body made of a heat-resistant material, and the cylindrical body is rotated by a supporting shaft. Since it was decided to support it as much as possible, it is possible to obtain a high-purity, high-quality powder product in a stable and continuous manner at high temperatures up to near its softening temperature without causing inconvenient phenomena such as coagulation and sticking. Can
Moreover, the tubular body is not deformed at all and the productivity is improved.

Further, since the heating rate is high, the thermal efficiency is high, stable continuous operation is possible, and a great energy saving can be achieved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a device of a first embodiment of the present invention in a plane including an axis.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a cross-sectional view perpendicular to the axis showing a modified example of a support shaft applicable to the apparatus shown in FIG.

FIG. 4 is a cross-sectional view perpendicular to the axis showing another modified example of the support shaft applicable to the apparatus shown in FIG.

FIG. 5 is a cross-sectional view of a modified example of the cylindrical body and the support shaft, taken along a plane including the axis.

6 is a cross-sectional view taken along a plane including an axis showing an example of a control member and a tubular body applicable to the apparatus shown in FIG.

FIG. 7 is a perspective view of a control member of the apparatus shown in FIG.

FIG. 8 is a partially cutaway perspective view showing another example of the control member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical body 1A, 1B Small diameter part of cylindrical body 2 Support shaft body 2A, 2B Large diameter part of support shaft body 3 Axis line 6 Heating body 14; 14A Control member 17 Partition wall 18 Guide plate

Claims (5)

[Claims] 1. A tubular body, which is mainly made of a heat-resistant material, has an axis line that is substantially horizontal or slightly inclined with respect to the horizontal direction, and has a space into which a powdery or granular material to be heated can be charged, and the tubular body. A plurality of support shafts having an axis substantially parallel to the axis of the cylindrical body and circumscribing the cylindrical body to rotatably support the cylindrical body; and a heating body for heating the cylindrical body. This is a horizontal rotary furnace. 2. The horizontal rotary furnace according to claim 1, wherein at least the outer layer of the support shaft is made of a heat-resistant material that does not chemically react with the material of the outer peripheral surface of the tubular body. 3. The cylindrical body has a small diameter portion at one end or both ends thereof, and the support shaft has a large diameter portion circumscribing corresponding to the small diameter portion of the cylindrical body. Item 2. A horizontal rotary furnace according to Item 1. 4. The horizontal rotary furnace according to claim 1, wherein a control member for keeping the object to be heated in the tubular body for a predetermined time is provided inside the tubular body. 5. The control member has a partition wall provided on a surface parallel to the axis of the tubular body, and guide plates that are vertical or inclined with respect to the partition wall on both sides of the partition wall. The horizontal rotary furnace according to claim 4.