JP5559664B2 - Vertical furnace - Google Patents

Description

The present invention relates to a shaft furnace to be used for heating and fine powder of the heated object.

  Micron-order and nano-order fine powders have higher adhesion than large powders. For this reason, fine powder tends to deposit on the furnace wall. In view of this point, Patent Document 1 discloses a spray roasting furnace with less powder adhesion.

  Three nozzles and a burner are arranged at the top of the spray roasting furnace described in the document. The burner is arranged in the core. The three nozzles are arranged around the burner at 120 ° intervals. A taper angle θ1 (pointed upward) of 20 ° or more and 60 ° or less is set near the furnace top with respect to the horizontal direction. With respect to the horizontal direction, a taper angle θ2 (a direction in which the taper is pointed downward) of 50 ° or more and 80 ° or less is set near the furnace bottom. From the three nozzles, droplets (80 to 100 μm) of an aqueous solution as a raw material are sprayed. The droplets are heated by the flame from the burner and become ferrite powder.

  According to the spray roasting furnace described in this document, it is possible to suppress the fine ferrite powder from adhering to the furnace wall and the periphery of the nozzle. For this reason, it can suppress that the flow state of the ferrite powder in a furnace changes. Moreover, it can suppress that the lump of the ferrite powder which fell from the furnace wall or the nozzle periphery mixes with a product. For this reason, the quality of the product is unlikely to vary.

JP-A-5-51220

  However, in the vertical furnace (spray roasting furnace) described in the same document, it is necessary to set special taper angles θ1 and θ2 in the vicinity of the furnace top and the furnace bottom. Further, the positional relationship between the nozzle and the burner is also limited. For this reason, the freedom degree regarding the shape design of a furnace is low.

The vertical furnace of the present invention has been completed in view of the above problems. An object of the present invention is to provide a vertical furnace that has a high degree of freedom in designing the shape of the furnace and that is difficult to adhere to an object to be heated .

  (1) In order to solve the above-mentioned problem, the vertical furnace of the present invention is disposed on a side peripheral wall that divides a heating chamber for heating a powder-like object to be heated inward in the radial direction, and the entire side peripheral wall, In order to prevent the object to be heated from adhering to the inner peripheral surface of the side peripheral wall, a furnace body having a plurality of air holes for blowing gas into the heating chamber is provided. Here, the “radial direction” refers to a direction orthogonal to the axial direction. That is, the cross-sectional shape in the direction orthogonal to the axial direction of the side peripheral wall may be a circle or a shape other than a circle.

  The vertical furnace includes a furnace body. The furnace body includes a side peripheral wall and a plurality of blow holes. The plurality of air holes are entirely disposed on the side peripheral wall. Gas is supplied from the blow hole to the heating chamber. The gas diffuses along the inner peripheral surface of the side peripheral wall. For this reason, a gas layer is formed on the inner peripheral surface. The gas layer can suppress the object to be heated from adhering to the inner peripheral surface. For this reason, it is possible to suppress a change in the flow state of the object to be heated in the heating chamber (a floating state when the object to be heated is fine). Moreover, it can suppress that the to-be-heated material peeled from the internal peripheral surface of the side peripheral wall mixes in a product.

  As described above, according to the vertical furnace of the present invention, the heat load such as the heating time and the heating temperature for the object to be heated is less likely to vary. For this reason, the quality of the product is unlikely to vary.

  Moreover, according to the vertical furnace of the present invention, unlike the spray roasting furnace of Patent Document 1, it is not necessary to set special taper angles θ1 and θ2 in the vicinity of the furnace top and the furnace bottom. Further, the positional relationship between the nozzle and the burner is not limited. For this reason, the freedom degree regarding the shape design of a furnace is high.

  (2) Preferably, in the configuration of the above (1), the furnace body is opened on one end side in the axial direction of the heating chamber, and a supply port for continuously supplying the object to be heated to the heating chamber; A discharge port that is opened on the other axial end side of the heating chamber and continuously discharges the object to be heated from the heating chamber, and is disposed on the radially outer side of the furnace body. It is better to have a configuration including an outer shell portion to which gas is supplied, and a heating portion that is disposed between the outer shell portion and the furnace body and heats the object to be heated in the heating chamber.

  The object to be heated flows in the order of the supply port, the heating chamber, and the discharge port. The furnace body is covered with an outer shell. Moreover, the heating part is arrange | positioned between the furnace body and the outer shell part. According to this structure, the gas supplied to a heating chamber from a ventilation hole can be exhausted outside a furnace through a discharge port.

  Further, when the thermal conductivity of the object to be heated is small (for example, when the object to be heated is ceramic), if the object to be heated is deposited on the inner peripheral surface, the heat transfer efficiency from the heating unit to the heating chamber is lowered. In this respect, according to the vertical furnace of the present invention, the object to be heated is difficult to deposit on the inner peripheral surface. For this reason, even if it is a case where the heat conductivity of a to-be-heated object is small, the heat-transfer efficiency from a heating part to a heating chamber does not fall easily.

  (3) Preferably, in the configuration of the above (2), the gas is heated by the heating unit and then blown into the heating chamber through the blow hole. According to this configuration, the temperature difference between the object to be heated and the gas is reduced in the heating chamber. For this reason, the temperature of the object to be heated is hardly lowered by the gas. Moreover, the temperature control of the heating chamber is simplified.

  (4) Preferably, in the configuration of (2) or (3), the heating unit may be configured to heat the object to be heated by radiant heat. According to this configuration, the side peripheral wall is heated by the radiant heat from the heating unit. And the to-be-heated material of a heating chamber is heated with the heat of a side surrounding wall. According to this configuration, the control of the flow state of the object to be heated is easier than in the case where combustion gas or the like is injected into the heating chamber. For this reason, the thermal load on the object to be heated is unlikely to vary.

  Moreover, in order to suppress that a to-be-heated material adheres to the internal peripheral surface of a side surrounding wall, gas is supplied to the heating chamber from the ventilation hole. Moreover, in order to carry in a to-be-heated material, carrier gas may be supplied from the upstream of a heating chamber. Further, in order to carry out the object to be heated, the heating chamber may be sucked from the downstream side. According to this configuration, control of the gas balance in the heating chamber is simplified as compared with the case where combustion gas or the like is injected into the heating chamber.

  (5) Preferably, in the configuration according to any one of the above (1) to (4), a plurality of holes formed in the side peripheral wall by arranging the plurality of air blowing holes in a circumferential direction of the side peripheral wall. An arbitrary pair of the holes arranged adjacent to each other in the axial direction are arranged side by side in the axial direction, and the air holes are arranged in the circumferential direction by a predetermined deviation amount so that the air blowing holes do not line up in the axial direction. It is better to have a configuration in which they are shifted. According to this structure, when a furnace body is seen from an axial direction, there are few sections in which the ventilation hole is not arrange | positioned in the perimeter of a side surrounding wall. For this reason, the object to be heated is less likely to adhere to the inner peripheral surface of the side peripheral wall.

  (6) Preferably, in the configuration of (5), an interval between any pair of the air blowing holes adjacent in the circumferential direction of the hole row is 10 mm, and any pair of the air holes adjacent in the axial direction. The interval between the columns is preferably 10 mm, and the shift amount is preferably 2 mm. According to this configuration, the object to be heated is less likely to adhere to the inner peripheral surface of the side peripheral wall.

  (7) Preferably, in the configuration according to any one of the above (1) to (6), the diameter of the air blowing hole is preferably 1 mm or less. The reason why the hole diameter (diameter) is set to 1 mm or less is that when it exceeds 1 mm, the strength of the furnace body is likely to decrease if a large number of air holes are arranged on the side peripheral wall. For the same reason, the hole diameter is more preferably 0.5 mm or less.

  (8) Preferably, in any one of the constitutions (1) to (7), the flow velocity of the gas blown from the blow holes is preferably 10 m or less per second. The reason why the flow rate is set to 10 m or less per second is that when it exceeds 10 m, it is difficult to form a gas layer near the inner peripheral surface of the side peripheral wall.

  (8-1) Preferably, in the configuration of (8), the flow velocity is preferably 5 m or less per second. According to this configuration, a gas layer is easily formed near the inner peripheral surface of the side peripheral wall.

  (9) Preferably, in any one of the configurations (1) to (8), the particle size of the object to be heated should be a micron order or less. Micron-ordered objects (1 to 100 μm), sub-micron order (several tens to several hundreds of nanometers), and nano-order (1 to 100 nm) of fine objects to be heated have a larger adhesive force than large objects to be heated. For this reason, a fine to-be-heated object is easy to accumulate on the inner peripheral surface of a side peripheral wall. In this regard, according to the vertical furnace of the present invention, the object to be heated is unlikely to adhere to the inner peripheral surface of the side peripheral wall. For this reason, it is suitable for heating a minute object to be heated.

  (10) In order to solve the above-described problem, the product of the present invention is manufactured by heating the object to be heated by a vertical furnace having any one of the above-described configurations (1) to (9). To do. As described above, according to the vertical furnace of the present invention, the heat load such as the heating time and the heating temperature for the object to be heated is less likely to vary. For this reason, the quality of the product is unlikely to vary.

  ADVANTAGE OF THE INVENTION According to this invention, the vertical furnace which has the high freedom degree regarding the shape design of a furnace and to which a to-be-heated material cannot adhere easily can be provided. In addition, according to the present invention, it is possible to provide a product whose quality is unlikely to vary.

It is a permeation | transmission perspective view of the vertical furnace which is one Embodiment of this invention. It is an axial sectional view of the same furnace. It is an expanded view of the internal peripheral surface of the side peripheral wall of the same type furnace. It is a fragmentary perspective view of the internal peripheral surface of the side peripheral wall of the same furnace. FIG. 5 is a view corresponding to FIG. 4 when the shift amount C3 of FIG. 3 is not set.

Hereinafter, embodiments of the vertical furnace of the present invention will be described.

[Configuration of vertical furnace]
First, the structure of the vertical furnace of this embodiment is demonstrated. In FIG. 1, the permeation | transmission perspective view of the vertical furnace of this embodiment is shown. FIG. 2 shows an axial sectional view of the same furnace. As shown in FIGS. 1 and 2, the vertical furnace 1 includes a furnace body 2, an outer shell part 3, a heating part 4, a supply cylinder part 5, and a discharge cylinder part 6.

  The furnace body 2 is made of alumina. The furnace body 2 has a hollow cylindrical shape. The furnace body 2 includes a side peripheral wall 20, 100 ventilation holes 21, a supply port 22, and a discharge port 23. The side peripheral wall 20 has a cylindrical shape. The axial direction of the side peripheral wall 20 is the vertical direction. In FIG. 3, the expanded view of the internal peripheral surface of the side peripheral wall of the vertical furnace of this embodiment is shown. Note that, in the circumferential direction in FIG. 3, the forward rotation direction is forward, right, rear, and left. As shown in FIG. 3, 100 air holes 21 are formed in the side peripheral wall 20. The blower hole 21 has a substantially perfect circle shape. The hole diameter (diameter) of the ventilation hole 21 is 0.5 mm. The blower hole 21 penetrates the side peripheral wall 20 in the radial direction. The 100 air blowing holes 21 form hole rows L1 to L10 every ten. That is, each of the hole rows L1 to L10 is formed by ten air blowing holes 21 arranged in a line in the circumferential direction. The hole rows L1 to L10 are arranged in the vertical direction (axial direction).

  An interval C1 between any pair of air blowing holes 21 adjacent in the circumferential direction of the hole rows L1 to L10 is 10 mm. An interval C2 between any pair of hole rows L1 to L10 adjacent in the vertical direction is 10 mm. Arbitrary pairs of hole rows L1 to L10 adjacent in the vertical direction are arranged so as to be shifted in the circumferential direction by a shift amount C3 (= 2 mm) so that the air blowing holes 21 are not aligned in the vertical direction. ing. As shown in FIG. 2, a heating chamber 200 is defined on the radially inner side of the side peripheral wall 20.

  The supply port 22 is opened on the upper wall of the furnace body 2, that is, on the upper side (upstream side) of the heating chamber 200. The supply port 22 has a substantially perfect circle shape. The discharge port 23 is opened on the lower wall of the furnace body 2, that is, on the lower side (downstream side) of the heating chamber 200. The discharge port 23 has a substantially perfect circle shape.

  The outer shell portion 3 covers the furnace body 2 from the outside. The outer shell portion 3 includes a housing 30, a heat insulating material 31, and a gas supply hole 32. The housing 30 is made of iron (SS) and has a hollow cylindrical shape. The heat insulating material 31 is made of a ceramic fiber and has a hollow cylindrical shape. The heat insulating material 31 is laminated on the inner surface of the housing 30 in a lining shape. The gas supply hole 32 is disposed on the upper wall of the outer shell 3. The gas supply hole 32 penetrates the housing 30 and the heat insulating material 31 in the vertical direction.

  The heating unit 4 is a so-called electric heater. The heating unit 4 is disposed in the gap between the outer shell 3 and the furnace body 2. The heating unit 4 covers the heating chamber 200 all around the side peripheral wall 20.

  The supply cylinder portion 5 is made of ceramic and has a cylindrical shape. The supply cylinder portion 5 is continuous above the supply port 22. The supply cylinder part 5 protrudes above the outer shell part 3. The discharge cylinder 6 is made of ceramic and has a cylindrical shape. The discharge cylinder portion 6 is continuous below the discharge port 23. The discharge cylinder portion 6 protrudes below the outer shell portion 3.

[Movement of vertical furnace]
Next, the movement of the vertical furnace of this embodiment will be described. The object to be heated 90 is fine powdery lithium manganate. The average particle diameter (diameter) of the object to be heated is 100 nm. The object to be heated 90 is carried into the heating chamber 200 from the outside of the furnace by the carrier gas from the compressor (not shown) through the supply cylinder portion 5 and the supply port 22. The article 90 to be heated is floating inside the heating chamber 200. The heating chamber 200 is heated from the outside in the radial direction by the radiant heat of the heating unit 4. Specifically, the side peripheral wall 20 is heated by the radiant heat from the heating unit 4. The heating chamber 200 is heated by the heat of the side peripheral wall 20. The temperature of the heating chamber 200 is 900 ° C. The heating chamber 200 is sucked by a blower (not shown) through the discharge cylinder portion 6 and the discharge port 23. For this reason, the object to be heated 90 staying in the heating chamber 200 for a certain period of time is carried out of the furnace through the discharge cylinder portion 6 and the discharge port 23. The object 90 to be heated is collected by a bag filter (not shown).

  By the way, when the article to be heated 90 is floating in the heating chamber 200, the gas 91 is blown from the blow hole 21 of the side peripheral wall 20. The gas 91 is supplied to the heating chamber 200 from a compressor (not shown) outside the furnace through the gas supply hole 32, the gap between the outer shell 3 and the furnace body 2, and the blower hole 21. A heating unit 4 is disposed in the gap between the outer shell 3 and the furnace body 2. For this reason, the gas 91 is heated by the heating unit 4 when passing through the gap.

  In FIG. 4, the fragmentary perspective view of the internal peripheral surface of the side peripheral wall of the vertical furnace of this embodiment is shown. FIG. 5 shows a diagram corresponding to FIG. 4 when the deviation C3 of FIG. 3 is not set. As shown in FIG. 5, when the deviation amount C3 is not set (when the deviation amount C3 = 0), ten air holes 21 are arranged in a line in the vertical direction. For this reason, as viewed from the axial direction, the section A1 in which the air blowing holes 21 are not disposed at all appears in dotted lines along the circumferential direction.

  The carrier gas G for the object to be heated flows in the heating chamber 200 from the upper side to the lower side. For this reason, the gas 91 discharged from the blower holes 21 is easily flowed downward by the carrier gas G. Therefore, a gas layer due to the gas 91 is easily formed in a portion between the blow holes 21 adjacent in the vertical direction. On the other hand, since the gas 91 flows downward in the portion between the air holes 21 adjacent to each other in the circumferential direction, it is difficult to form a gas layer of the gas 91. For this reason, the object to be heated 90 is likely to adhere and deposit in the section A1.

  On the other hand, as shown in FIG. 3, when the deviation amount C3 is set, the air holes 21 are not aligned in the vertical direction. For this reason, as viewed from the axial direction, a section in which the air blowing holes 21 are not arranged at all does not appear along the circumferential direction.

  The gas 91 discharged from the blower holes 21 is easily flowed downward by the carrier gas G. Therefore, a gas layer due to the gas 91 is easily formed in a portion between the blower holes 21 adjacent in the vertical direction (a portion between the blower hole 21 of the hole row L1 and the blower hole 21 of the hole row L6).

  In addition, in the portion between the air holes 21 adjacent to each other in the circumferential direction of any hole row (for example, the hole row L5), from the air holes 21 on the upper (upstream side) hole rows (for example, the hole rows L1 to L4), Gas 91 flows. For this reason, the gas layer by the gas 91 is easily formed in the part between the ventilation holes 21 adjacent in the circumferential direction.

  Thus, when the deviation | shift amount C3 is set, the gas layer by the gas 91 is formed also in the part between the ventilation holes 21 adjacent to the up-down direction, and the part between the ventilation holes 21 adjacent to the circumferential direction. Cheap. Therefore, the object to be heated 90 is difficult to adhere and deposit over the entire surface.

[Function and effect]
Next, the effect of the vertical furnace of this embodiment is demonstrated. According to the vertical furnace 1 of the present embodiment, the 100 air holes 21 are entirely disposed on the side peripheral wall 20. A gas 91 is supplied from the blower hole 21 to the heating chamber 200. The gas 91 diffuses along the inner peripheral surface of the side peripheral wall 20. For this reason, a gas layer is formed on the inner peripheral surface. The gas layer can suppress the object to be heated 90 from adhering to the inner peripheral surface. For this reason, it can suppress that the floating state of the to-be-heated material 90 in the heating chamber 200 changes. Moreover, it can suppress that the to-be-heated material 90 peeled from the internal peripheral surface of the side peripheral wall 20 mixes in a product. In addition, the object 90 to be heated is less likely to accumulate on the inner peripheral surface as if it were a refractory material. For this reason, there is little possibility that the heat transfer efficiency from the heating unit 4 to the heating chamber 200 will decrease. Thus, according to the vertical furnace 1 of the present embodiment, the heat load such as the heating time and the heating temperature for the object to be heated 90 is unlikely to vary. For this reason, the quality of the product is unlikely to vary.

  Moreover, according to the vertical furnace 1 of this embodiment, the freedom degree regarding the shape design of a furnace is high. Further, according to the vertical furnace 1 of the present embodiment, the gas 91 supplied from the blow hole 21 to the heating chamber 200 can be exhausted outside the furnace through the discharge port 23.

  Further, according to the vertical furnace 1 of the present embodiment, the gas 91 is heated by the heating unit 4 and then blown into the heating chamber 200 through the blower holes 21. For this reason, the temperature difference between the to-be-heated object 90 of the heating chamber 200 and the gas 91 becomes small. Therefore, the temperature of the object to be heated 90 is not easily lowered by the gas 91.

  The heating unit 4 is an electric heater. The heating unit 4 heats the object to be heated 90 by radiant heat. For this reason, compared with the case where combustion gas etc. are injected into the heating chamber 200, control of the floating state of the to-be-heated object 90 becomes easy. Therefore, the heat load on the object to be heated 90 is unlikely to vary.

  Further, in order to suppress the object to be heated 90 from adhering to the inner peripheral surface of the side peripheral wall 20, the gas 91 is supplied to the heating chamber 200 from the blower hole 21. Further, a carrier gas G is supplied from the upstream side of the heating chamber 200 in order to carry the object 90 to be heated. Moreover, in order to carry out the to-be-heated material 90, the heating chamber 200 is attracted | sucked from the downstream. According to the vertical furnace 1 of the present embodiment, control of the gas balance in the heating chamber 200 is simplified as compared with the case where combustion gas or the like is injected into the heating chamber 200.

  Further, ten hole rows L1 to L10 are arranged in the vertical direction on the side peripheral wall 20. Arbitrary pairs of hole rows L1 to L10 adjacent in the vertical direction are arranged so as to be shifted in the circumferential direction by a predetermined shift amount C3 so that the air blowing holes 21 are not aligned in the vertical direction. For this reason, when the furnace body 2 is viewed from the upper side or the lower side, there are few sections A1 in which the air holes 21 are not arranged in the entire circumference of the side peripheral wall 20. For this reason, the heated object 90 is unlikely to adhere to the inner peripheral surface of the side peripheral wall 20.

  Further, the air blowing holes 21 are arranged in a spiral with respect to the flow direction (vertical direction) of the carrier gas G. That is, the flow direction of the carrier gas G and the direction in which the blow holes 21 are arranged intersect each other. Also in this respect, the article 90 to be heated is unlikely to adhere to the inner peripheral surface of the side peripheral wall 20.

  However, as shown in FIG. 5, even when the deviation C3 in FIG. 3 is not set, it is included in the concept of the vertical furnace of the present invention. Even if the deviation amount C3 is not set, the air blowing hole 21 is entirely disposed in the side peripheral wall 20. For this reason, it can suppress that the to-be-heated material 90 adheres to the internal peripheral surface of the side surrounding wall 20 compared with the case where the ventilation hole 21 is not arrange | positioned in the side surrounding wall 20 entirely.

  Moreover, the space | interval C1 of arbitrary pair of ventilation holes 21 adjacent to the circumferential direction of the hole row | line | columns L1-L10 is 10 mm. Moreover, the space | interval C2 of arbitrary pair of hole rows L1-L10 adjacent to an up-down direction is 10 mm. The deviation amount C3 is 2 mm. For this reason, the heated object 90 is unlikely to adhere to the inner peripheral surface of the side peripheral wall 20. Moreover, the hole diameter of the ventilation hole 21 is 0.5 mm. For this reason, the strength of the furnace body 2 is unlikely to decrease. Moreover, the flow velocity of the gas 91 blown from the blow hole 21 is 5 m or less per second. For this reason, a gas layer is easily formed near the inner peripheral surface of the side peripheral wall 20.

  In addition, according to the vertical furnace 1 of the present embodiment, the inner periphery of the side peripheral wall 20 despite the fact that the object to be heated 90 is a fine powder with a particle diameter of 100 nm, in other words, a large adhesion force. The object to be heated 90 is difficult to adhere to the surface.

  Moreover, according to the vertical furnace 1 of the present embodiment, the heat load such as the heating time and the heating temperature for the article to be heated 90 is unlikely to vary. For this reason, the quality (for example, the particle diameter of primary particles, characteristics, etc.) of a product manufactured from the object to be heated 90 is unlikely to vary.

[Others]
The embodiment of the vertical furnace of the present invention has been described above. However, the embodiment is not particularly limited to the above embodiment. Various modifications and improvements that can be made by those skilled in the art are also possible.

  The intervals C1 and C2 and the shift amount C3 are not particularly limited. Preferably, the number of hole rows L1 to L10 should be equal to or greater than (interval C1 / shift amount C3). For example, in the case of the above embodiment, the number (= 10) of the hole rows L1 to L10 is twice the interval C1 (= 10 mm) / the shift amount C3 (= 2 mm). If it carries out like this, area A1 (refer FIG. 5) in which the ventilation hole 21 is not arrange | positioned at all will not appear easily on the perimeter.

  The number of arrangement of the hole rows L1 to L10 is not particularly limited. The number of air holes 21 arranged is not particularly limited. The opening shape of the blowing hole 21 is not particularly limited. For example, it may be a polygon such as a triangle or a rectangle, an ellipse, an oval (a shape in which a pair of opposing semicircles are connected by a pair of straight lines), a slit shape, or the like. Moreover, you may arrange | position the ventilation hole 21 at random. Further, the arrangement density of the air holes 21 in the side peripheral wall 20 may not be constant over the entire side peripheral wall 20. For example, the arrangement density on the upstream side (upper side) may be larger than the arrangement density on the downstream side (lower side). Alternatively, the arrangement density on the upstream side may be smaller than the arrangement density on the downstream side.

  You may change the hole diameter of the ventilation hole 21 to a hole axial direction. For example, the air hole 21 may be tapered. The blower holes 21 may not extend in the radial direction of the side peripheral wall 20. For example, it may extend in the tangential direction. Further, an air flow (for example, a swirling flow, an upflow, a downflow, etc.) may be generated in the heating chamber 200 by the gas 91 from the blower hole 21. The horizontal cross-sectional shape of the side peripheral wall 20 is not particularly limited. Besides a perfect circle, it may be a polygon such as a triangle or a rectangle, an ellipse, or an oval.

  The kind of gas 91 is not specifically limited. An inert gas (such as nitrogen, helium, or argon), a reducing gas (such as carbon monoxide), or the like may be used. The material of the furnace body 2 is not particularly limited. It may be a ceramic such as zirconia, mullite, silicon carbide or silicon nitride, or a metal such as stainless steel.

  In the above embodiment, the object to be heated 90 is transported from above to below, but the object to be heated 90 may be transported from below to above. In the above embodiment, an electric heater is used as the heating unit 4, but a burner (such as a regenerative burner), a microwave generator, or the like may be used. Preferably, the object 90 to be heated can be heated by radiant heat. In the above embodiment, the heating unit 4 is disposed outside the heating chamber 200 in the radial direction. However, the heating unit 4 is disposed outside the outer shell 3 and only the heating medium is introduced from the heating unit 4 into the heating chamber 200. May be. In the above embodiment, the outer shell 3 is disposed, but the outer shell 3 may not be disposed. In the above embodiment, the present invention is embodied as a fluid type vertical furnace 1, but may be embodied as a batch type vertical furnace.

  1: vertical furnace, 2: furnace body, 3: outer shell part, 4: heating part, 5: supply cylinder part, 6: discharge cylinder part, 20: side peripheral wall, 21: blower hole, 22: supply port, 23 : Exhaust port, 30: housing, 31: heat insulating material, 32: gas supply hole, 90: heated object, 91: gas, 200: heating chamber, A1: section, C1: interval, C2: interval, C3: deviation amount , G: carrier gas, L1 to L10: hole array.

Claims (6)

A side wall that divides the heating chamber that heats the powder-like object to be heated inward in the radial direction, and is disposed entirely on the side peripheral wall to prevent the object to be adhered to the inner peripheral surface of the side peripheral wall. In order to do so, a furnace body having a plurality of blowing holes for blowing gas into the heating chamber ,
In the side peripheral wall, a plurality of hole rows formed by arranging the plurality of air blowing holes in the circumferential direction of the side peripheral wall are arranged side by side in the axial direction,
A vertical furnace in which an arbitrary pair of the hole rows adjacent in the axial direction is shifted in the circumferential direction by a predetermined shift amount so that the air blowing holes are not aligned in the axial direction . The furnace body, the opened one axial end side of the heating chamber, a supply port for supplying continuously the object to be heated in the heating chamber, is opened in the axial direction other end side of the heating chamber, continuous And a discharge port for discharging the object to be heated from the heating chamber,
Furthermore, an outer shell portion that is disposed outside the furnace body in the radial direction and is supplied with the gas therein,
A heating unit disposed between the outer shell and the furnace body for heating the object to be heated in the heating chamber;
The vertical furnace according to claim 1, comprising:   The vertical furnace according to claim 2, wherein the gas is heated by the heating unit and then blown into the heating chamber through the blower hole.   The vertical furnace according to claim 2 or 3, wherein the heating unit heats the object to be heated by radiant heat.   An interval between any pair of the air blowing holes adjacent in the circumferential direction of the hole row is 10 mm,
  An interval between any pair of the hole rows adjacent in the axial direction is 10 mm,
  The vertical furnace according to any one of claims 1 to 4, wherein the shift amount is 2 mm.   The vertical furnace according to any one of claims 1 to 5, wherein a hole diameter of the air blowing hole is 1 mm or less.

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