Rotary kiln

Abstract

The present invention relates to a rotary kiln for firing raw material powder, the kiln including a firing device having a tube assembly arranged horizontally and rotating to mix the raw material powder, and a heating assembly for heating the raw material powder mixed by the tube assembly, a supplying device having a supply assembly inserted into one end of the tube assembly and supplying the raw material powder to the inside of the tube assembly, and a collecting assembly provided at one end of the tube assembly for collecting gas and water vapor generated when the raw material powder supplied to the inside of the tube assembly is heated, and a condensing device for condensing the water vapor collected in the collecting assembly to a liquid state, so that the water vapor generated inside the tube assembly can be smoothly removed.

Description

Technical Field

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0057238 filed on May 10, 2022, and all the contents disclosed in the literature of the Korean patent application are incorporated herein by reference as part of this specification.

[0002] The present invention relates to a rotary kiln capable of collecting water vapor generated during heating of raw material powder and then condensing and removing it in a liquid state.

Background Art

[0003] Generally, a secondary battery, unlike a primary battery that cannot be charged, refers to a battery capable of charging and discharging, and such secondary batteries are widely used in the field of advanced electronic devices such as mobile phones, notebook computers, and video cameras.

[0004] Particularly, as technology development and demand related to mobile devices increase, the demand for secondary batteries as an energy source has been rapidly increasing. Among such secondary batteries, lithium secondary batteries having a high energy density, high voltage, long cycle life, and low self-discharge rate have been commercialized and widely used.

[0005] In a lithium secondary battery, a lithium transition metal oxide is used as a positive electrode active material. That is, as the positive electrode active material, lithium cobalt oxide having a high operating voltage and excellent capacity characteristics, lithium nickel oxide having a high reversible capacity of about 200 mAh / g and facilitating the realization of a large-capacity battery, lithium nickel cobalt oxide in which a part of nickel is replaced with cobalt, lithium nickel cobalt metal oxide in which a part of nickel is replaced with manganese, cobalt, or aluminum, lithium manganese-based oxide having excellent thermal stability and low cost, and lithium iron phosphate having excellent stability are used.

[0006] The positive electrode active material is manufactured by mixing a precursor for manufacturing the positive electrode active material with lithium raw materials, and then placing the mixture in a heating device and firing it at a high temperature.

[0007] Here, a rotary kiln can be used as the heating device. The rotary kiln includes a rotating tube that contains a precursor for producing positive electrode active material and lithium raw material (hereinafter referred to as raw material powder) and mixes them by rotating them horizontally, a heating element provided on the outside of the rotating tube that heats the rotating tube and heats the raw material powder to cause a reaction, a supply member that supplies the raw material powder to the rotating tube, and a recovery member that recovers the raw material powder discharged from the rotating tube.

[0008] On the other hand, the raw material powder contains moisture. That is, when the raw material powder is heated, the moisture evaporates and water vapor is generated. At this time, in order to ensure smooth mixing and drying of the raw material powder, it is necessary to smoothly discharge and remove the water vapor generated inside the rotating tube. [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] The present invention aims to provide a rotary kiln that can collect water vapor generated during the heating of raw material powder on the outside of the rotating tube, and then condense it into a liquid state for removal. [Means for solving the problem]

[0010] In the present invention, the rotary kiln for calcining raw material powder may include a calcination apparatus equipped with a tube assembly that rotates horizontally and mixes the raw material powder, and a heating assembly that heats the raw material powder mixed by the tube assembly; a supply assembly inserted into one end of the tube assembly and supplying the raw material powder into the tube assembly, and a collection assembly provided at one end of the tube assembly and collecting gases and water vapor generated when the raw material powder supplied into the tube assembly is heated; and a condensing apparatus that condenses the water vapor collected in the collection assembly and liquefies it into a liquid state.

[0011] The collection assembly includes a chamber connected to one end of the tube assembly for collecting gas and water vapor discharged from the tube assembly, and the condenser may include a condensing tube provided inside the chamber for condensing the water vapor collected inside the chamber into a liquid state via a supplied refrigerant, a supply unit for supplying refrigerant to the condensing tube, and a recovery unit for recovering the refrigerant that has passed through the condensing tube.

[0012] The condensing apparatus further includes a fixed plate on which the condensing tube is provided, and one or more condensing plates connected to the condensing tube, which diffuse the cold air transmitted from the condensing tube to condense water vapor, wherein the condensing plates may be provided so as to extend in a vertical direction perpendicular to the longitudinal direction of the tube assembly. The fixing plate may be made of the same material as the condensing plate.

[0013] The supply assembly includes an input pipe inserted into one end of the tube assembly into which raw material powder is introduced, and a conveying screw provided inside the input pipe that, when rotated, moves the raw material powder toward the tube assembly and supplies it to the tube assembly, and the condenser can be provided in close proximity to the input pipe.

[0014] The condensing device may further include a barrier plate provided in the input pipe located at one end of the tube assembly, which blocks the condensed liquid from flowing along the input pipe into the interior of the tube assembly.

[0015] The blocking plate may have a disc shape that surrounds the outer surface of the input pipe. The blocking plate can be provided so as to be adjustable in position along the length of the input pipe.

[0016] The condensing device may further include a hopper provided at the bottom of the chamber for collecting the liquid falling from the condensing device and the liquid falling from the shut-off plate and discharging them to the outside.

[0017] The collection assembly further includes a protective member that seals the space between one end of the tube assembly and the chamber, the protective member may include a fixed tube fixed to the chamber, a support tube supported on the outer surface of the tube assembly, and a corrugated connecting tube connecting the fixed tube and the support tube.

[0018] The assembly may further include a recovery member for recovering the raw material powder discharged from the tube assembly. The condensing tube may be arranged in a "U" shape, and the supply unit and the recovery unit may be connected to both ends of the "U" shaped condensing tube, respectively, and may be provided protruding from the outside of the chamber. [Effects of the Invention]

[0019] The rotary kiln of the present invention, by including a firing device, a feeding device, and a condensing device, can smoothly collect water vapor generated during the heating of the raw material powder and remove it by condensing it into a liquid state. In particular, it can prevent malfunctions of the feeding device caused by water vapor. [Brief explanation of the drawing]

[0020] [Figure 1] This is a front view showing a rotary kiln according to the first embodiment of the present invention. [Figure 2] It is an enlarged view of the part "A" shown in FIG. 1. [Figure 3] It is a cross-sectional view taken along the line B-B shown in FIG. 1. [Figure 4] It is an enlarged view of the part "C" shown in FIG. 1. [Figure 5] It is an enlarged view of the part "D" shown in FIG. 1. [Figure 6] It is an enlarged view showing the protective member of the recovery device of the present invention. [Figure 7] It is a cross-sectional view showing the rotary kiln according to the second embodiment of the present invention.

Mode for Carrying Out the Invention

[0021] Hereinafter, referring to the accompanying drawings, embodiments of the present invention will be described in detail so that those having ordinary knowledge in the technical field to which the present invention pertains can easily implement it. However, the present invention may be realized in various different forms and is not limited to the embodiments described here. And in the drawings, parts not related to the description are omitted in order to clearly explain the present invention, and similar parts throughout the specification are denoted by similar reference numerals.

[0022] [Rotary Kiln According to the First Embodiment of the Present Invention] The rotary kiln according to the first embodiment of the present invention has a structure capable of collecting water vapor generated during heating of raw material powder and condensing and removing the collected water vapor in a liquid state. Thereby, the water vapor generated inside the rotary kiln can be smoothly removed, and as a result, the raw material powder can be stably mixed and dried.

[0023] Hereinafter, referring to the accompanying drawings, the rotary kiln according to the first embodiment of the present invention will be described in detail. FIG. 1 is a front view showing the entire rotary kiln according to the first embodiment of the present invention, FIG. 2 is an enlarged view of the part A shown in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line B-B shown in FIG. 1.

[0024] A rotary kiln according to the first embodiment of the present invention is for calcining raw material powder and includes a calcination device 100, a supply device 200, a condenser 300, and a recovery device 400.

[0025] Firing apparatus The firing apparatus 100 includes a tube assembly 110 that rotates while being positioned horizontally to mix the raw material powder, and a heating assembly 120 that heats the raw material powder mixed by the tube assembly 110.

[0026] The tube assembly 110 has a long, horizontally extending structure and has a double-layered structure including an outer tube 111 and an inner tube 112 provided inside the outer tube 111. The tube assembly 110 is formed from a metal material with excellent thermal conductivity. For example, the tube assembly 110 can be made of nickel. The tube assembly 110 having such a structure can smoothly mix the raw material powder being fed in while rotating horizontally.

[0027] The heating assembly 120 is for heating the raw material powder that has been introduced into the tube assembly 110. As an example, the heating assembly 120 can be arranged to surround the outer surface of the tube assembly 110, and by heating the outside of the tube assembly 110, it can be structured to heat the raw material powder introduced into the tube assembly 110.

[0028] In other words, the heating assembly 120 includes a heating body 121 provided in a manner that surrounds the outer surface of the tube assembly 110, and a heating medium 122 provided on the heating body 121 corresponding to the tube assembly 110 for heating the tube assembly 110. Here, the heating medium may be one of the following: an electric heating element, SiC, Mo-Si, or a gas burner.

[0029] The outer surface of the heating body 121 is made of a heat-resistant material to prevent the heat source of the heating medium 122 from being discharged to the outside. A heating assembly 120 having such a structure can smoothly heat the raw material powder mixed by the tube assembly 110.

[0030] The firing apparatus 100 includes a support member 130 that supports the tube assembly 110 so that it can rotate horizontally. The support member 130 includes a rotating gear 131 provided in a manner that surrounds the outer circumferential surface of the tube assembly 110, and support portions 132 provided with support gears 132a that mesh with the bottom surface of the rotating gear 131, support the rotating gear 131, and are rotated by the rotating gear 131.

[0031] In other words, in the support member 130, when the tube assembly 110 rotates, the rotating gear 131 rotates in conjunction with the tube assembly 110, and the rotating gear 131 rotates the support gear 132a. At this time, since the support gear 132a supports both sides of the bottom of the rotating gear 131, it can stably support the tube assembly 110 which rotates in the horizontal direction.

[0032] The firing apparatus 100 includes a rotating member 140 for rotating the tube assembly 110 horizontally. The rotating member 140 includes a drive gear 141 coupled in a manner that surrounds the outer circumferential surface of the tube assembly 110, and a drive motor 142 that meshes with the drive gear 141 and rotates the tube assembly 110 horizontally via the drive gear 141.

[0033] feeding device The supply device 200 is for supplying raw material powder to a tube assembly and includes a supply assembly 210 and a collection assembly 220.

[0034] The supply assembly 210 is inserted into one end of the tube assembly 110 (the left end of the tube assembly, as shown in Figure 1) and has a structure that supplies raw material powder into the inside of the tube assembly 110.

[0035] In other words, the supply assembly 210 includes an input pipe 211 inserted into one end of the tube assembly 110 into which raw material powder is introduced, and a conveying screw 212 provided inside the input pipe 211 that, when rotated, moves the raw material powder toward the tube assembly 110 and supplies it to the tube assembly 110.

[0036] Here, the input pipe 211 has an input port at one end into which the raw material powder is introduced, and an outlet at the other end for discharging the raw material powder to the tube assembly 110.

[0037] The collection assembly 220 is provided at one end of the tube assembly 110 and has a structure for collecting gas and water vapor generated when the raw material powder supplied to the inside of the tube assembly 110 is heated. In other words, the collection assembly 220 has a structure for collecting gas and water vapor discharged from one end of the tube assembly 110.

[0038] As an example, the collection assembly 220 is provided in a manner that surrounds one end of the tube assembly 110 and includes a chamber 221 for collecting gas and water vapor discharged from the tube assembly 110, and a protective member 222 for sealing the space between one end of the tube assembly 110 and the chamber 221.

[0039] Figure 4 is an enlarged view of section C shown in Figure 1. Here, the protective member 222 includes a fixed pipe 222a fixed to the chamber 221, a support pipe 222b supported on the outer circumferential surface of the tube assembly 110, and a corrugated connecting pipe 222c connecting the fixed pipe 222a and the support pipe 222b. As a result, the protective member can protect the gap between the tube assembly 110 and the chamber 221 from the outside.

[0040] Condenser The condenser 300 is used to condense the water vapor collected in the chamber 221 of the collection assembly 220 and liquefy it into a liquid state.

[0041] In other words, the condenser 300 includes a condensing tube 310 provided inside the chamber 221 that condenses water vapor collected inside the chamber 221 via a supplied refrigerant, liquefying it into a liquid state; a supply unit 320 that supplies refrigerant to the condensing tube 310; and a recovery unit 330 that recovers the refrigerant that has passed through the condensing tube 310.

[0042] In a condenser 300 having such a structure, when refrigerant is supplied to the condensing tube 310 via the supply unit 320, the cold air diffuses into the chamber 221 via the condensing tube 310, condensing the water vapor collected in the chamber 221. This liquefies the water vapor into a liquid state, and as a result, the water vapor can be effectively removed. Meanwhile, the refrigerant that has passed through the condensing tube 310 is recovered via the recovery unit 330. Here, the condenser tube 310 is made of a metal material, and preferably, the condenser tube 310 can be made of copper.

[0043] On the other hand, the condensing tube 310 can be provided in a zigzag-bent shape. This can increase the residence time of the refrigerant passing through the condensing tube 310, and as a result, water vapor can be condensed more effectively. For example, the condensing tube 310 can be provided in a "U" shape or an "L" shape.

[0044] If the condensing pipe 310 has a "U" shape, the supply unit 320 and the recovery unit 330 are connected to both ends of the "U" shaped condensing pipe 310, respectively. In particular, the supply unit 320 and the recovery unit 330 can be provided protruding from the outside of the chamber 221, thereby allowing the refrigerant generator (not shown) and the supply unit 320 and recovery unit 330 to be easily connected or disconnected, and as a result, the efficiency of the work can be increased.

[0045] If water vapor condenses on the input pipe 211 of the supply assembly 210, it can hinder the conduction of heat applied to the conveyor screw 212, potentially causing problems with the smooth operation of the conveyor screw 212. To prevent this, the condensing pipe 310 of the condenser 300 can be installed close to the input pipe 211. This allows the condensing pipe 310 to condense the water vapor before it condenses on the input pipe 211, thereby maintaining the smooth operation of the conveyor screw 212.

[0046] The condenser tube 310 can be positioned at a set distance so as not to be in close contact with the inlet tube 211. In other words, if the condenser tube 310 is in close contact with the inlet tube 211, friction noise will be generated, and the liquid condensed in the condenser tube 310 may flow onto the outer surface of the inlet tube 211.

[0047] The condenser 300 may include a fixed plate 340 on which a condensing tube 310 is provided. The fixed plate 340 has a rectangular plate shape and is fixed inside the chamber 221 using fixing means, and the condensing tube 310 is fixed to one side of the plate by welding or clips.

[0048] The condenser 300 may include one or more condensation plates 350 to enhance the condensation power of water vapor. The condensation plates 350 are connected to the condensing tube 310 and diffuse the cold air transmitted from the condensing tube 310 into the chamber 221, thereby effectively condensing the water vapor collected inside the chamber 221. In particular, referring to Figure 5, the condensation plates 350 are provided to be long in the vertical direction perpendicular to the longitudinal direction of the tube assembly 110, and in particular, there may be at least two, preferably four or more, condensation plates 350. This allows the liquid condensed on the condensation plates 350 to fall smoothly and be removed.

[0049] The fixed plate 340 can be made of the same material as the condensing plate 350. In other words, the condensing tube 310, the fixed plate 340, and the condensing plate 350 are made of the same material, which allows water vapor to be condensed even through the fixed plate 340, and as a result, water vapor can be condensed and removed more quickly.

[0050] The condenser 300 further includes a shutoff plate 360 ​​provided on the input pipe 211 located at one end of the tube assembly 110. In other words, the blocking plate 360 ​​prevents the condensed liquid from flowing into the tube assembly 110 along the input pipe 211, thereby preventing the liquid from mixing with the raw material powder supplied to the tube assembly 110.

[0051] In particular, the shut-off plate 360 ​​can be provided in a form that surrounds the outer circumferential surface of the input pipe 211. For example, the shut-off plate 360 ​​can have a disc shape as shown in Figure 3. This allows the entire outer circumferential surface of the input pipe 211 to be stably covered. On the other hand, a rubber pad 361 to enhance the sealing force can be further included between the input pipe 211 and the shut-off plate 360, as shown in Figure 7.

[0052] Here, one barrier plate 360 ​​is provided on the outer surface of the inlet pipe 211, but two or more may be provided on the inlet pipe 211 to reliably block the ingress of liquid. In particular, when two or more barrier plates 360 are provided on the inlet pipe 211, one of the barrier plates 360 corresponding to the tube assembly 110 can be made of a heat-resistant material, thereby preventing the barrier plate 360 ​​from being damaged by the heat of the tube assembly 110.

[0053] The condenser 300 may include a refrigerant generator (not shown) that supplies refrigerant to the supply unit 320 and recovers the refrigerant that has passed through the recovery unit 330. On the other hand, any device that generates refrigerant can typically be used as the refrigerant generator.

[0054] The condenser 300 may include a hopper 370 for discharging the liquid condensed inside the chamber 221 to the outside. The hopper 370 is located at the bottom of the chamber 221 and collects the liquid falling from the condenser 300 and the liquid falling from the shutoff plate 360, and then discharges it to the outside through a long, connected connecting pipe.

[0055] Here, the hopper 370 may be provided below the condenser 300 and below the shut-off plate 360, respectively, or it may be provided so as to cover the entire area below the condenser 300 and below the shut-off plate 360.

[0056] The condenser 300 having such a structure can quickly and smoothly condense the water vapor collected inside the chamber 221 into a liquid state, and the condensed liquid can be smoothly discharged to the outside for removal. In particular, the condenser 300 can prevent water vapor from condensing on the supply assembly 210, thereby preventing malfunctions from occurring.

[0057] Recovery device Figure 5 is an enlarged view of section D shown in Figure 1. The recovery device 400 has a structure for recovering the raw material powder discharged from the tube assembly 110.

[0058] In other words, the recovery device 400 includes a recovery member 410 into which the other end of the tube assembly 110 (the right end of the tube assembly 110, as shown in Figure 1) is freely rotatable. The recovery member 410 recovers the raw material powder discharged from the tube assembly 110 and then moves it to a designated location for storage.

[0059] Here, the recovery member 410 can be provided so as to be detachable from the other end of the tube assembly 110, thereby making maintenance of the other end of the tube assembly 110 and the recovery member 410 easier.

[0060] The recovery member 410 and the other end of the tube assembly 110 can be kept at a set distance apart. This prevents the heat source of the tube assembly 110 from being directly conducted to the recovery member 410.

[0061] The recovery device 400 may include a gas discharge member 420 for discharging gas from inside the tube assembly 110, and the gas discharge member 420 may be provided at the upper end of the recovery member 410. That is, the gas discharge member 420 filters the gas collected in the recovery member 410 from the tube assembly 110 and then discharges only pure air to the outside.

[0062] Figure 6 is an enlarged view showing the support member of the recovery device of the present invention. The recovery device 400 may include a protective member 430 that connects the recovery member 410 and the tube assembly 110 in a sealed manner. The protective member 430 includes a fixed pipe 431 fixed to the recovery member 410, a support pipe 432 supported at the other end of the tube assembly 110, and a corrugated connecting pipe 433 connecting the fixed pipe and the support pipe.

[0063] Therefore, the rotary kiln according to the first embodiment of the present invention, by including a firing device 100, a supply device 200, and a condensing device 300, can smoothly collect water vapor generated inside the tube assembly 110, and smoothly condense and remove the collected water vapor. The following describes the operating state of the rotary kiln according to the first embodiment of the present invention.

[0064] [Operation method of a rotary kiln according to the first embodiment of the present invention] First, the tube assembly 110 of the firing apparatus 100 is rotated horizontally, and then the tube assembly 110 is heated to a set temperature using the heating assembly 120 and maintained at that temperature.

[0065] When the tube assembly 110 maintains the set temperature, the raw material powder is supplied to one end of the tube assembly 110 via the supply assembly 210 of the supply device 200. The heated tube assembly 110 then mixes and heats the raw material powder simultaneously. In particular, the raw material powder moves little by little toward the other end of the tube assembly 110.

[0066] During this process, gas and steam are generated when the raw material powder is heated, and these gases and steam are collected in the chamber 221 of the collection assembly 220 via one end of the tube assembly 110.

[0067] In this configuration, a condenser 300 is provided inside the chamber 221. The condenser 300 can condense the water vapor collected inside the chamber 221 via the supplied refrigerant, liquefying it into a liquid state. As a result, the water vapor collected inside the chamber 221 can be removed quickly and smoothly. In particular, the condenser 300 is equipped with a condensing tube 310, a fixed plate 340, and a condensing plate 350, which allows for smoother condensation of water vapor.

[0068] The liquid condensed by the condenser 300 flows into the hopper 370, and the liquid that flows into the hopper 370 can be discharged to the outside via a discharge pipe connected to the hopper 370 and removed.

[0069] In describing other embodiments of the present invention below, components having the same function as those described in the previously mentioned embodiments will be denoted by the same reference numerals, and redundant explanations will be omitted.

[0070] [Rotary kiln according to the second embodiment of the present invention] Figure 7 is a cross-sectional view showing a rotary kiln according to a second embodiment of the present invention.

[0071] The rotary kiln according to the second embodiment of the present invention shows another embodiment relating to the shutoff plate 360 ​​of the rotary kiln according to the first embodiment described above. In other words, the shutoff plate 360 ​​of the rotary kiln according to the second embodiment of the present invention can be provided so as to be adjustable in position along the length of the input pipe 211.

[0072] In other words, the barrier plate 360 ​​may be positioned close to one end of the tube assembly 110 by moving in the longitudinal direction of the input pipe 211, or it may be positioned at a set distance away from one end of the tube assembly 110.

[0073] As an example, the shut-off plate 360 ​​may include a shut-off portion 362 provided in a manner that surrounds the outer circumferential surface of the input pipe 211, a fixing portion 363 integrally provided on one surface of the shut-off portion 362, and a fixing bolt 364 that penetrates the fixing portion and is press-fitted into the input pipe 211. That is, the shut-off plate 360 ​​can be fixed to the input pipe 211 by tightening the fixing bolt 364, and the shut-off plate 360 ​​can be moved in the longitudinal direction of the input pipe 211 by loosening the fixing bolt 364.

[0074] Therefore, the rotary kiln according to the second embodiment of the present invention can improve the efficiency of use by providing a shut-off plate 360 ​​that can be positioned in the longitudinal direction of the input pipe 211.

[0075] The scope of the present invention is indicated by the claims described below, as described in the detailed description above, and various embodiments are possible derived from the meaning and scope of the claims and their equivalent concepts. [Explanation of symbols]

[0076] 100: Firing apparatus 110: Tube Assembly 111: Outer tube 112: Inner tube 120: Heating Assembly 121: Heating unit 122:Heating medium 130: Support member 131: Rotating gear 132: Support part 132a: Support gear 140: Rotating member 141: Drive Gear 142: Drive motor 200: Feeding device 210: Supply Assembly 211: Input pipe 212: Conveyor screw 220: Collection Assembly 221: Chamber 222: Protective component 222a: Fixed tube 222b: Support tube 222c: Connecting pipe 300: Condenser 310: Condenser 320: Supply Department 330: Recovery Department 340: Fixed plate 350: Condensing plate 360: Barrier 361: Rubber pad 362: Blocking section 363: Fixed part 364: Fixing bolt 370: Hoppa 400: Recovery device 410: Recovery material 420: Gas discharge component 430: Protective component

Claims

1. A rotary kiln for calcining raw material powders, A firing apparatus is provided with a tube assembly that rotates while being positioned horizontally to mix raw material powders, and a heating assembly that heats the raw material powders mixed by the tube assembly, A supply device comprising a supply assembly inserted into one end of the tube assembly for supplying raw material powder into the tube assembly, and a collection assembly provided at one end of the tube assembly for collecting gas and water vapor generated when the raw material powder supplied into the tube assembly is heated, A condensing device that condenses the water vapor collected in the aforementioned collection assembly and liquefies it into a liquid state, Includes, The collection assembly is connected to one end of the tube assembly and includes a chamber for collecting gases and water vapor discharged from the tube assembly. The condensing apparatus is a rotary kiln comprising: a condensing tube provided inside the chamber for condensing water vapor collected inside the chamber into a liquid state via a supplied refrigerant; a supply unit for supplying refrigerant to the condensing tube; and a recovery unit for recovering the refrigerant that has passed through the condensing tube.

2. The condensing apparatus further includes a fixed plate on which the condensing tube is provided, and one or more condensing plates connected to the condensing tube that diffuse the cold air transmitted from the condensing tube to condense water vapor, The rotary kiln according to claim 1, wherein the condensing plate is provided to extend in a vertical direction perpendicular to the longitudinal direction of the tube assembly.

3. The rotary kiln according to claim 2, wherein the fixing plate is made of the same material as the condensing plate.

4. The supply assembly includes an input pipe inserted into one end of the tube assembly into which raw material powder is introduced, and a conveying screw provided inside the input pipe that, when rotated, moves the raw material powder toward the tube assembly and supplies it to the tube assembly. The rotary kiln according to claim 1, wherein the condensing device is provided in close proximity to the input pipe.

5. The rotary kiln according to claim 4, wherein the condensing device further includes a shutoff plate provided on the input pipe located at one end of the tube assembly, which prevents the condensed liquid from flowing along the input pipe into the interior of the tube assembly.

6. The rotary kiln according to claim 5, wherein the shutoff plate has a disc shape that surrounds the outer surface of the input pipe.

7. The rotary kiln according to claim 5, wherein the shut-off plate is provided so as to be adjustable in position along the length of the input pipe.

8. The rotary kiln according to claim 5, wherein the condensing device further includes a hopper provided at the bottom of the chamber for collecting the liquid falling from the condensing device and the liquid falling from the shutoff plate and discharging them to the outside.

9. The collection assembly further includes a protective member that seals the space between one end of the tube assembly and the chamber. The rotary kiln according to claim 1, wherein the protective member includes a fixed tube fixed to the chamber, a support tube supported on the outer surface of the tube assembly, and a corrugated connecting tube connecting the fixed tube and the support tube.

10. The rotary kiln according to claim 1, further comprising a recovery member for recovering raw material powder discharged from the tube assembly.

11. The condensing tubes are arranged in a zigzag pattern, The rotary kiln according to claim 1, wherein the supply unit and the recovery unit are connected to both ends of a zigzag-shaped condensing tube and are provided protruding from the outside of the chamber.

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