JP6972860B2 - Rotary kiln end structure - Google Patents

Description

The present invention relates to an end structure of a rotary kiln. More specifically, the present invention relates to an end structure of a rotary kiln provided with a scraper capable of suppressing the growth of inner wall deposits on the inner wall of the kiln body.

Conventionally, in the process of firing crude zinc oxide in a series of steps of recovering zinc from crude zinc oxide dust contained in steelmaking electric furnace dust, etc., the main body, which is a hollow cylindrical rotary furnace, and the discharge port side of the main body. A rotary kiln having a heating burner section arranged in is widely used.

In this rotary kiln, high-temperature burnt ore, high-temperature gas, etc. reaching 1000 ° C. or higher and 1300 ° C. or lower pass through the internal space of the metallic outer shell (shell). The above-mentioned high-temperature burnt ore has a problem that it adheres to the inner wall of the kiln body and grows into a ring-shaped inner wall deposit in a particularly high temperature region inside the main body of the rotary kiln. Countermeasures have been proposed and implemented.

As a general method for removing deposits on the inner wall of a heating furnace, Patent Documents 1 and 2 describe that a scraper having a unique shape and structure is appropriately charged in the kiln body to rotate the scraper itself or to rotate the rotary kiln. A method has been proposed in which the grown inner wall deposits are physically removed by rolling the scraper due to its own rotation.

Since the method for removing the inner wall deposits described in Patent Documents 1 or 2 is to remove the grown inner wall deposits by a mechanical load after the growth, the kimono is caused by the fall of the inner wall deposits at the time of removal. There was a risk that the load related to the deterioration or damage of the inner wall or the removal of the deposits on the inner wall would lead to the deterioration or damage of the kiln body.

Further, all of the above mechanical removal methods are means for covering the discharge port where the inner wall deposits are likely to finally accumulate in the kiln body and the vicinity thereof as the main scope of the inner wall deposit removal work. It was premised that the scraper or the like used as the removing means could withstand a strong load and exert a strong cutting force. Further, providing a movable rotary blade in a high-temperature kiln not only complicates the equipment, but also makes maintenance difficult due to wear, high-temperature deterioration, and the like. Furthermore, if a water-cooled structure is used, there is a risk of water leaking into the hot kiln.

On the other hand, in the vicinity of the furnace butt of the rotary kiln, relatively soft deposits are deposited due to the heat transfer from the exhaust gas, which heats the surface of the deposits and deposits. Due to the narrowing of the gas, it will eventually hinder the smooth movement of the gas. In order to avoid such a situation, there is a problem that the operation of the rotary kiln must be suspended and the work of physically removing the above-mentioned inner wall deposits must be performed.

However, in the kiln main body, the removal of the inner wall deposits on the furnace butt side, which is the raw material input port side in a relatively low temperature range, is the same as the case of the method for removing the inner wall deposits described in Patent Document 1 or 2. Since the conditions regarding the strength and cutting force of the removing means are not always essential, a simpler and more efficient means for removing the inner wall deposits, which is specialized for removing the inner wall deposits on the furnace butt side, is required. It was like that.

As a removal means specialized for removing the deposits on the inner wall in the vicinity of the furnace butt of the rotary kiln, a raw material charging device inserted into the furnace from the furnace butt side of the kiln body and a mode fixed to the raw material charging device. A rotary kiln end structure including a scraper for scraping off the deposits on the inner wall of the kiln body has been developed (Patent Document 3).

However, the scraper disclosed in Patent Document 3 is supported on a raw material charging device installed near the furnace bottom side, and although it is possible to scrape off the deposits on the inner wall of the kiln, the scraped deposits can be scraped off. Has come to be recognized as a new problem that is deposited on the raw material input device.

Japanese Unexamined Patent Publication No. 8-313156 Japanese Unexamined Patent Publication No. 2002-81866 Japanese Unexamined Patent Publication No. 2014-185840

In view of the above situation, the present invention can efficiently remove the deposits on the inner wall, especially on the furnace butt side of the rotary kiln, by a simple means, and further, the scraped deposits can be transferred to other parts in the kiln body. It is an object of the present invention to provide a means for removing inner wall deposits that can prevent reattachment and accumulation.

The present inventors can easily and surely scrape off the deposits on the inner wall of the kiln body by horizontally arranging the scraper for removing the deposits on the inner wall near the furnace butt side of the rotary kiln. We have found that it is possible to prevent the scraped deposits from reattaching and accumulating on the structure inside the kiln body, and have completed the present invention. More specifically, the present invention provides the following.

(1) A kiln body which is a rotating body having a hollow cylindrical shape, and a fixed scraper which is installed on the furnace tail side inside the kiln body and scrapes off the deposits on the inner wall of the kiln body when the kiln body rotates. It is an end structure of a rotary kiln including The scraper has a support portion and a scraping blade portion installed at the tip of the support portion, and the support portion is arranged along the horizontal radial direction of the vertical cross-sectional circle of the kiln body. The end structure of the rotary kiln.

(2) The end of the rotary kiln according to (1), further comprising a raw material charging device inserted into the furnace from the furnace bottom side of the kiln body, and the scraper is fixedly installed on the raw material charging device. structure.

(3) The length of the scraping blade portion from the rotation center axis of the kiln body on the raw material input port side to the cutting edge of the scraping blade portion is larger than the length to the cutting edge inside the furnace. The end structure of the rotary kiln according to (1) or (2), which is arranged so as to be.

(4) The support portion is composed of a plurality of plate-shaped or rod-shaped support portions, and the scraping blade portion is composed of a plurality of plate-shaped members connected at the tips of the plurality of the support portions (1). ) To (3). The end structure of the rotary kiln.

According to the present invention, the inner wall deposits on the furnace butt side of the rotary kiln can be efficiently removed by a simple means, and the scraped deposits reattach to other parts in the kiln body. It is possible to provide a means for removing inner wall deposits that can also be prevented from accumulating.

It is sectional drawing which shows typically the whole structure of the rotary kiln which has the end structure of the rotary kiln of this invention. It is sectional drawing which shows typically the end structure of the rotary kiln of this invention. It is a perspective view which shows the structure of the main part of the end structure of the rotary kiln of this invention schematically. It is a top view schematically showing the structure of the main part of the end structure of the rotary kiln of this invention. It is a front view which shows typically the structure of the raw material input port side of the rotary kiln which has the end structure of the rotary kiln of this invention. It is a schematic diagram which provides the explanation of the removal action of the inner wall deposit by the end structure of the rotary kiln of this invention.

Hereinafter, embodiments of the present invention will be described. The present invention is not limited to the following embodiments. Hereinafter, an embodiment when the end structure of the rotary kiln of the present invention is applied to a large rotary kiln for drying and heating used for firing zinc calcination or the like will be described. However, the present invention describes a cylindrical rotary heating furnace. If so, it is a technology that can be applied to various other heating furnaces.

<Rotary Kiln>
First, with reference to FIGS. 1 to 5, the overall configuration and usage of the rotary kiln 1, which is an example of a rotary kiln to which the end structure of the rotary kiln of the present invention can be preferably applied, will be described. By providing the rotary kiln 1 with the end structure 2 of the rotary kiln of the present invention, the inner wall deposits on the furnace butt side of the rotary kiln can be efficiently removed.

The rotary kiln 1 includes a kiln body 10 which is a rotating body having a hollow cylindrical shape, a raw material charging device 20 inserted from a raw material charging port 11 and arranged toward the inside of a furnace, a burner unit 40, a drive gear 50, a fixed hood 60, and a fixed hood 60. A rotary heating furnace including a kiln support portion (not shown) that supports the kiln body 10. The kiln main body 10 is usually 1 to 1 with respect to the horizontal plane in the direction in which the fired object 3 moves toward the discharge port 12 for discharging the fired object 3 from the raw material input port 11 which is the input port of the fired object 3. It is installed so that it has an inclination of 4%. Then, the object to be fired 3 is fired while being rotated in the R direction by the drive gear 50.

The end structure 2 of the rotary kiln, which constitutes a part of the rotary kiln 1, has a scraper 30 fixedly installed inside the furnace bottom side of the kiln main body 10 to scrape off the inner wall deposits made of the object to be fired 3. It is a structure. It is preferable that the scraper 30 is fixed by a structure installed in the raw material charging device 20.

The kiln body 10 is not particularly limited as long as it is a cylindrical kettle having fire resistance, but an irregular refractory such as mortar or a refractory such as refractory bricks is attached to the inner surface of a metal shell made of carbon steel or the like. It is preferable that the refractory is used. A raw material input port 11 is formed on the end surface of the cylindrical kiln main body 10 on the furnace butt side, and a part of the surface is opened. Normally, the raw material input device 20 is provided from the raw material input port 11. It has been inserted.

On the furnace tail side where the raw material input port 11 is formed in the kiln main body 10, at least the inner diameter of the inner wall around the raw material input port 11 is smaller than the inner diameter of the inner wall inside the furnace. In addition, on the furnace butt side of the kiln body 10, the inner diameter may be gradually increased toward the inside of the furnace. The end structure 2 of the rotary kiln of the present invention is preferably applicable to such a general internal structure on the furnace butt side of the kiln body 10.

The raw material charging device 20 is a device for charging the object to be fired 3 carried out from the pre-process prior to firing by the rotary kiln 1 into the kiln main body 10. Known equipment such as a belt conveyor and a screw conveyor can be appropriately used. However, it is more preferable that the scraper 30 has a shape and a structure that can be stably fixed to the outside on the top surface side. The raw material charging device 20 is stably installed at an appropriate position by a support means (not shown) provided outside the kiln main body 10.

The scraper 30 has a structure in which a scraping blade portion 31 made of a member capable of scraping off inner wall deposits is installed or formed at the tip of the support portion 32. As shown in FIGS. 3 and 4, the support portion 32 and the scraping blade portion 31 can both be formed of a plate-shaped member. However, it is not essential that the support portion 32 and the scraping blade portion 31 are formed by connecting individual members. For example, the scraper may have the same shape as the scraper 30 and can exhibit the same action and effect related to scraping, and the support portion 32 and the scraping blade portion 31 may be integrally molded.

The scraper 30 preferably has a plate-like shape as a whole as the shape of the outer edge thereof. The planar shape of the member having such a plate-top shape is preferably a one-sided spreading shape as shown in FIGS. 3 and 4. More specifically, the scraper 30 has a length inside the furnace that is larger than the length from the rotation center axis of the kiln body to the cutting edge of the scraping blade 31 on the raw material input port 11 side of the kiln body 10. It is preferable that the scraping blade portion 31 has a planar shape so as to be arranged.

When the planar shape of the scraper 30 has the shape of unilateral spreading as described above, the details of the degree of diverging of the scraping blade portion 31 can be found in the opening diameter and opening position of the raw material input port 11 of each kiln main body 10. And, according to the shape of the inner wall of the kiln main body 10 on the furnace tail side, that is, according to the mode of gradually expanding the inner diameter of the kiln main body 10 in the installation range of the scraper 30, the blade tip of the scraping blade portion 31 The position of the above may be appropriately adjusted so as to be appropriately close to the inner wall of the kiln main body 10 within a necessary range.

The scraper 30 is arranged along the horizontal radial direction of the vertical cross-sectional circle of the kiln body 10 in the vicinity of the inside of the kiln body 10 on the furnace bottom side. The horizontal radial direction is defined as −90 ° in the vertical downward direction, 90 ° in the vertical upward direction, and 0 ° in the middle horizontal direction among the radial directions over 360 ° of the above vertical cross-sectional circle. It refers to the direction of 0 °.

By arranging the scraper 30 in the horizontal direction as described above, the scraped deposits reattach mainly to other parts in the kiln body such as the upper surface of the raw material charging device. Can be prevented from accumulating. When installed facing downward from the horizontal direction, the risk of damage to the scraper 30 due to contact with the stagnant material in the furnace increases. Further, if the temperature is lower than −45 °, the flow effect of the object to be fired, which is inherent in the kiln, is hindered, which is not preferable. On the other hand, if it is installed facing upward from the horizontal direction, there is a risk that it cannot be completely prevented from adhering and accumulating on the raw material input device 20 and the like due to the scattering of the scraped deposits.

As described above, since the rotation axis of the kiln body 10 usually has an inclination of 1 to 4% with respect to the horizontal direction, the scraper 30 more specifically includes the rotation axis inclined to this extent and the rotation thereof. It is preferable that the scraper is arranged in a plane formed by a horizontal line orthogonal to the axis, but the above-mentioned structure also describes a structure in which the scraper is arranged at a position where translation is performed in a plane parallel to this plane. If the movement is within a range in which the same action and effect as that of the end structure 2 can be obtained, it is within the range of the present invention. The term "along the horizontal radial direction" as used herein is intended to include such an arrangement.

The length of the scraper 30 in the direction of the rotation axis of the kiln body 10 is not particularly limited, but is preferably about 1.0 m to 1.5 m.

The material of each member such as the support portion 32 and the scraping blade portion 31 constituting the scraper 30 may be a material having heat resistance that can withstand use in a high temperature environment of about 900 ° C., preferably about 900 to 1200 ° C. Just do it. Specific examples of preferable materials include stainless steel and the like.

Regarding the mechanical strength and rigidity of the scraper 30, it is not always necessary to have the same strength as the scraper used near the discharge port 12 in the conventional kiln main body. Unlike the conventional general removing member, the scraper 30 according to the present invention does not target the growth and hardening of the inner wall deposits, and is in a relatively soft state immediately after charging, which is in the stage before the growth progresses. This is because the deposits on the inner wall of the above are targeted for removal.

The structure of the scraper 30 may be, for example, a structure in which a single scraping blade portion is installed or formed at the end portion of a support portion made of a single plate-shaped member, but FIGS. 3 and 4 may be used. As shown in the above, a plurality of plate-shaped members 31a, 31b, 31c constituting the scraping blade portion 31 at the tips of the plurality of plate-shaped support portions 32a, 32b, 32c, 32d made of the above materials. Is supported and connected, and it is preferable that each of the members has a hollow structure. Even with such a structure, it is possible to provide the scraper 30 with the necessary and sufficient strength, and on the other hand, by adopting such a hollow structure, it is possible to avoid the accumulation of the in-core deposits on the upper surface of the scraper 30. can. Further, this can prevent the securing of a sufficient gas passage cross-sectional area from being hindered, and can maintain a smooth gas flow inside the kiln main body 10.

Since the scraper 30 is made of the above-mentioned materials and structures, it is relatively easy to reduce the weight, and since it is intended to remove relatively soft inner wall deposits, the raw material input device 20 is used. Even if it is a support, it can be installed without applying an excessive load to it.

When the scraper 30 is fixed to the outer upper surface of the raw material charging device 20 in the furnace butt side of the kiln main body 10, that is, in the space inside the furnace near the raw material charging port 11, the position of the scraper 30 is the kiln main body 10. It is specified to optimize the relative position of the scraping blade 31 with respect to the inner wall of the.

The position of the scraper 30 with respect to the rotation axis direction of the kiln body 10 is preferably such that the scraping blade portion 31 is located at the end of the kiln body 10 on the side of the raw material input port 11 with respect to the rotation axis direction of the kiln body 10. It is preferable that the position is such that the particles are arranged in a distance range of 0 m or more and 2.0 m or less, more preferably 0.5 m or more and 1.5 m or less. There is a risk that securing the gas passage cross-sectional area near the raw material input port will be hindered. Further, in a rotary kiln of a general size, it is necessary to secure a sufficient gas passage cross-sectional area, but the range in which the deposition of deposits is most likely to be promoted is within the above range. Further, if the distance from the end portion is less than 0.5 m, it may not be possible to install due to the positional relationship with the gable surface. When the scraper 30 is fixed to the outer upper surface of the raw material charging device 20 such as a screw conveyor, as shown in FIG. 2, the position of the scraper 30 with respect to the rotation axis direction of the kiln main body 10 is the raw material charging device 20. It is preferably in the range up to the tip inside the furnace. Since the gas temperature on the furnace bottom side of the kiln main body 10 is usually less than 1000 ° C., by arranging the scraper 30 in a range satisfying such a condition, immediately after being charged into the kiln main body 10 by the raw material charging device 20. Before the object 3 to be fired grows as a solid mass, it can be scraped off with a minimum load.

The distance between the scraping blade portion 31 at the tip of the scraper 30 and the inner wall of the kiln body 10 may be appropriately adjusted according to various physical properties such as the particle size and viscosity of the object to be fired. Generally, it is preferable that the distance between the scraping blade portion 31 and the inner wall of the kiln main body 10 is about 100 mm to 150 mm. This distance can be optimized by adjusting the shape of the scraper 30 when the position of the raw material charging device 20 is already fixedly fixed with respect to the kiln main body 10. In particular, when the scraper 30 has the above-mentioned hollow structure, such position adjustment can be easily performed by changing the length of the support portion 32.

In the scraper 30, as shown in FIG. 4, the support portions 32 (32a, 32b, 32c, 32d) are covered with angle members 33 (33a, 33b, 33c, 33d) having an L-shaped cross section, respectively. The upper surface may be shaped like a triangular roof. As a result, the rigidity of the support portion 32 can be strengthened, and the accumulation of suspended matter in the furnace on the upper surface of the support portion 32 can be prevented. Further, as shown in FIG. 5, a reinforcing angle 34 that assists the support portion 32 may be further installed.

The burner section 40 is a heating device such as a heavy oil burner provided near the discharge port 12 side of the kiln main body 10, and is a heat source for the rotary kiln 1 and can heat the inside of the kiln main body 10 to 1100 ° C to 1300 ° C. Just do it. Further, the drive gear 50 can transmit the rotational force in the R direction in the drawing to the kiln main body 10, and the fixed hood 60 can prevent the diffusion of the exhaust gas discharged from the kiln main body 10. good.

In the rotary kiln 1 having the above configuration, the inside of the kiln main body 10 is heated to a high temperature of about 900 ° C. or higher and 1300 ° C. or lower by the burner portion 40, and the raw material is charged while rotating the kiln main body 10 in the R direction by the drive gear 50. By the device 20, the material to be fired is charged from the raw material charging port 11 in the direction a shown in FIG. The object to be fired is stirred and fired along the inclination of the kiln body 10 and moves in the kiln body 10 toward the discharge port 12, and from the discharge port 12, the high temperature object to be fired moves in the b direction. It is discharged.

<End structure of rotary kiln>
Next, with reference to FIGS. 2 to 6, the configuration and action / effect of the end structure of the rotary kiln of the present invention (hereinafter, also simply referred to as “end structure”) will be described in more detail.

As shown in FIG. 2, the end structure 2, the baked product 3, after being transported to a ₀ direction by the raw material introduction device 20, in the vicinity of the end portion of the raw material feeding device 20, toward the a ₁ direction kiln It falls to the inner wall of the main body 10. The object to be fired 3 first starts to grow as an inner wall deposit around this drop point. As shown in FIG. 2, the scraper 30 is preferably fixed in a range including directly above the drop point of the object to be fired 3. By fixing the scraper 30 at such a position, the object to be fired 3 can be efficiently peeled off from the inner wall and removed before it grows as an inner wall deposit.

Further, since the planar shape of the scraper 30 is a shape that spreads to one side as shown in FIG. 4, first, the deposit 3c deposited in the vicinity of the raw material charging device 20 is placed in the opening portion of the raw material charging port 11. It is possible to surely prevent the sediment from growing up to that point. At the same time, in the range inside the furnace including the drop point of the object to be fired 3, the scraping blade portion 31 is brought close to the inner wall of the kiln body to a necessary and sufficient extent to secure a sufficient gas passage cross-sectional area. However, in this range where the deposition of deposits is likely to be promoted, the deposits can be sufficiently removed. As described above, the scraper 30 has the scraping blade portion 31 arranged at an optimum horizontal position adapted to the internal structure and shape in the vicinity of the raw material input port on the furnace bottom side of the kiln main body 10. By the above action, in the end structure 2, it is possible to prevent the situation where the inner wall deposits grow on the furnace bottom side and cause the furnace to be blocked.

Further, as shown in FIG. 6, the scraper 30 is arranged along the horizontal radial direction of the vertical cross-sectional circle of the kiln main body 10, so that the upper surface of the raw material input device 20 and the like are arranged in the kiln main body. It is possible to prevent the scraped deposits from reattaching and accumulating in other places. A part of the object to be fired 3a immediately after falling from the raw material input device 20 to the inner wall of the kiln main body 10 adheres to the inner wall of the kiln main body 10 and moves upward with the rotation of the kiln main body 10 (3b). It collides with the scraping blade portion 31 of the scraper 30, is peeled off from the inner wall of the kiln main body 10, and falls to the bottom of the kiln main body 10. Due to the structure and action of the end structure 2, the inner wall deposit made of the object to be fired 3 is removed from the inner wall of the kiln body 10 before it grows large. Therefore, it is possible to prevent a situation in which deposits on the inner wall grow on the furnace butt side and cause the furnace to be blocked. Further, it is possible to prevent the scraped deposits from accumulating on other structures in the kiln main body 10 such as the raw material charging device 20. Further, this makes it possible to prevent a situation in which deposits on the inner wall grow on the furnace butt side and cause the furnace to be blocked.

When the rotary kiln is in operation, the scraper is not always fixed to the raw material input device as long as it has an end structure including a structure that is a part of the rotary kiln in the above manner capable of scraping off the deposits on the inner wall. Even if it is not a structure, it is within the same range as the end structure of the rotary kiln of the present invention.

Conventionally, in order to remove the deposits on the inner wall, which are solid lumps grown in the rotary kiln, a removal process using a scraper having a special shape having strong rigidity and applying a load to the kiln body has been indispensable. However, according to the end structure 2 of the present invention, the scraper 30 can be stably installed at a position which is a growth start point of the inner wall deposit on the furnace butt side. Further, by adopting a structure in which the raw material charging device 20, which is an indispensable component during the operation of the rotary kiln 1 in order to load the object to be fired 3, is used as a support for the scraper 30, a new structure can be additionally installed. The structure is minimal and extremely excellent in terms of installation cost.

The above rotary kiln end structure has the following effects.

(1) In a rotary kiln in which a material to be fired is fired at a high temperature, there has been a demand for a means for efficiently removing deposits on the inner wall of the rotary kiln on the raw material input port side. Therefore, in the invention of (1), as a means for removing the deposits on the inner wall of the rotary kiln, an end structure of the rotary kiln having a unique structure was developed. In this end structure, a fixed scraper was placed near the raw material input port on the furnace tail side in the kiln body, and this placement was specified as the placement along the horizontal radial direction of the vertical cross-sectional circle of the cylindrical rotary kiln. It is a thing. According to this end structure, the deposits on the inner wall, especially on the furnace butt side of the rotary kiln, can be efficiently removed by simple means, and the scraped deposits can be relocated to other parts in the kiln body. It can also be prevented from adhering and accumulating. This makes it possible to prevent a decrease in the gas passage cross-sectional area in the kiln body.

(2) Further, regarding the fixing position of the scraper, it is more preferable to have a structure in which the scraper is fixedly installed on the raw material charging device inserted and arranged in the furnace from the furnace bottom side of the kiln main body. According to this, the installation cost of the scraper is greatly reduced by using the raw material charging device, which is an indispensable component during the operation of the rotary kiln, as a support for the scraper in order to load the material to be fired. can do.

(3) Further, it is more preferable that the planar shape of the scraper has a planar shape that spreads to one side as shown in FIG. 3 and the like. According to this, on the furnace bottom side of the rotary kiln having a structure in which the inner diameter varies stepwise along the rotation axis direction, the deposits on the inner wall can be efficiently removed to every corner by a simple means.

(4) Further, it is more preferable that the structure of the scraper is a simple structure having many hollow portions in which a plurality of members for scraping blade portions are connected by a plurality of support portions. According to this, in terms of easy fine adjustment of the horizontal position of the scraping blade portion and in terms of manufacturing cost, it is possible to further enhance the superiority over the conventional product. In addition, it is possible to prevent the dropped object to be fired from accumulating on the scraper.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments. Further, the effects described in the embodiments of the present invention merely list the most suitable effects arising from the present invention, and the effects according to the present invention are limited to those described in the examples of the present invention. is not it.

1 Rotary kiln 10 Kiln body 11 Raw material input port 12 Discharge port 2 End structure 20 Raw material input device 3 Scraper 31 Scraping blade part 32 Support part 33 Angle material 34 Reinforcing angle 40 Burner part 50 Drive gear 60 Fixed hood

Claims (2)

Includes a kiln body that is a hollow cylindrical rotating body, and a fixed scraper that is installed on the furnace bottom side inside the kiln body and scrapes off the deposits on the inner wall of the kiln body when the kiln body rotates. It is the end structure of the rotary kiln.
On the furnace butt side of the kiln body, a raw material input port is formed in which a part of the end surface of the kiln body having a cylindrical shape is opened.
It is equipped with a raw material input device that is inserted and placed in the furnace from the furnace butt side of the kiln body.
The scraper has a support portion and a scraping blade portion installed at the tip of the support portion, and is fixedly installed on the raw material input device.
The support portion is arranged along the radial direction rotated by 90 ° along the rotation direction of the kiln body from the vertical downward direction in the radial direction of the vertical cross-sectional circle of the kiln body over 360 °. Edge structure. The length of the scraping blade portion from the rotation center axis of the kiln body on the raw material input port side to the cutting edge of the scraping blade portion is larger than the length of the scraping blade portion to the cutting edge inside the furnace. The end structure of the rotary kiln according to claim 1, which is arranged.

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