External support heat preservation structure of internal heating type rotary kiln

Abstract

The utility model provides an external support heat preservation structure of an internal heating type rotary kiln, the external support heat preservation structure comprises a heat preservation and insulation layer and an outer cylinder body which are sequentially arranged on the outer side of an inner cylinder body of the rotary kiln, the inner cylinder body and the outer cylinder body are coaxially and rotatably arranged, and a cavity between the inner cylinder body and the outer cylinder body is filled with the heat preservation and insulation layer; the inner cylinder body and the outer cylinder body are connected in a guide rail popliteal fossa shape, and expansion joints are arranged in the heat preservation and insulation layer and divide the heat preservation and insulation layer into a plurality of heat preservation and insulation units. The heat preservation and insulation layer and the outer barrel are arranged on the outer side of the inner barrel, so that the rotary kiln has excellent supporting, fixing and heat preservation effects, the use temperature of the rotary kiln can be increased, the service life of the rotary kiln can be prolonged, and heat loss of the rotary kiln is reduced; the inner cylinder body and the outer cylinder body are connected in a popliteal space shape, an expansion joint is arranged in the heat preservation and insulation layer, enough thermal expansion space can be reserved to limit deformation and bending of the cylinder bodies, the service life of the rotary kiln is prolonged, the maintenance cost and the manufacturing cost of the rotary kiln are reduced, installation is convenient, and the application range of the rotary kiln is widened.

Description

Technical Field

[0001] The utility model belongs to the technical field of calcining equipment and relates to an external support insulation structure of an internal heating rotary kiln. Background Art

[0002] As a common equipment in industry, rotary kiln is widely used in fields such as metallurgy, chemical industry, construction and environmental protection. Rotary kilns can be divided into internal heating type and external heating type according to the different heating methods. At present, internal heating type rotary kiln is commonly used as calcining equipment. Internal heating type rotary kiln uses gas combustion as the heat source to heat the material, and the direction of movement of the calcined material is opposite to the direction of gas introduction. When the calcination temperature of the rotary kiln is too high or the feed amount is small, the high temperature section of the cylinder is prone to bending, deformation, and even fracture, which significantly reduces the life of the rotary kiln. Therefore, it is necessary to set a thermal insulation layer on the rotary kiln cylinder to increase the service life of the rotary kiln and reduce heat loss.

[0003] Depending on the structure of the rotary kiln, its insulation layer can be installed inside or outside the cylinder. Traditional rotary kilns use refractory bricks as insulation on the inside of the cylinder, but this insulation effect is limited, and the cylinder temperature remains high. Without insulation measures on the outer surface of the cylinder, it will cause significant heat loss and low thermal efficiency. Later, rotary kilns developed to install an insulation layer on the outside of the cylinder, and an outer cylinder is used to support and fix the insulation layer. Depending on the calcined material, for example, when rare earth salts are used as the calcined material, the purity requirements of the rare earth calcined products are high. To prevent contamination of the material, a rotary kiln with an external insulation layer is the only option. The design of the outer structure of such rotary kilns must also aim to increase service life and reduce energy consumption.

[0004] CN 2856897Y discloses a cylindrical double-lined rotary kiln comprising a cylindrical body, a combustion chamber, and conventional devices. The combustion chamber is located at the head of the cylindrical body, and a support device is provided on the exterior of the cylindrical body. The inner wall of the cylindrical body is lined with refractory bricks, and a layer of insulating refractory bricks is laid between the inner wall and the refractory bricks. The refractory bricks are laid with staggered joints, and expansion joints are provided between the layers of refractory bricks and insulating refractory bricks. The two expansion joints are staggered. This rotary kiln still belongs to the conventional rotary kiln with an internal thermal insulation layer, which is different from a rotary kiln with an external thermal insulation layer. The fixing of the external thermal insulation layer and the need for expansion joints are irrelevant.

[0005] CN 220206317U discloses a rotary kiln insulation device, comprising a rotary kiln cylinder. An insulation cylinder and an outer shell are disposed on the outer side of the rotary kiln cylinder. An insulating cavity is provided between the insulation cylinder and the rotary kiln cylinder. Multiple supporting ribs are axially disposed within the insulating cavity, each of which is provided with ventilation holes. Both the insulation cylinder and the outer shell are composed of two semi-cylinders. A high-temperature cloth layer is wrapped around the outer side of the insulation cylinder to secure it. Sealing flanges are provided at both ends of the outer shell, contacting the outer wall of the rotary kiln cylinder. A compression groove is provided on the inner side of the sealing flange to compress the outer end of the high-temperature cloth layer. The sealing flange is provided with a sealing groove, and a sealing ring is provided within the sealing groove. This device does not completely fill the space between the inner and outer cylinders with an insulation layer, but rather maintains an insulating cavity. However, this cavity requires high sealing performance, which increases equipment cost and is easily affected by cylinder expansion, thereby affecting cylinder strength.

[0006] In summary, for the external support insulation structure of the rotary kiln shell, it is also necessary to reasonably design the connection structure between the insulation layer and the inner and outer shells according to the structural changes during calcination, so that it can have supporting and insulation effects while also increasing the service life of the rotary kiln and reducing heat loss. Utility Model Content

[0007] In response to the problems existing in the prior art, the purpose of the present invention is to provide an external support and insulation structure for an internally heated rotary kiln. The external support and insulation structure has excellent support and insulation effects by arranging a thermal insulation layer and an outer cylinder on the outside of the inner cylinder, and reserves space for thermal expansion through the popliteal connection method and the arrangement of expansion joints, thereby increasing the service life of the rotary kiln, reducing heat loss, and at the same time reducing the installation difficulty and cost of the rotary kiln.

[0008] To achieve this purpose, the present invention adopts the following technical solutions:

[0009] The utility model provides an external support and thermal insulation structure for an internally heated rotary kiln. The external support and thermal insulation structure comprises a thermal insulation layer and an outer cylinder which are sequentially arranged on the outside of an inner cylinder of the rotary kiln. The inner cylinder and the outer cylinder are arranged to rotate coaxially, and a cavity between the inner cylinder and the outer cylinder is filled with the thermal insulation layer. The inner cylinder and the outer cylinder are connected in a popliteal shape by using guide rails, and an expansion joint is provided in the thermal insulation layer to separate it into a plurality of thermal insulation units.

[0010] In the present invention, for the internal heating rotary kiln, based on the characteristics of the calcined material, when a thermal insulation layer needs to be provided on the outside thereof, an outer cylinder body needs to be provided to play a supporting and fixing role. The provision of the thermal insulation layer and the outer cylinder body enables it to have excellent supporting, fixing and thermal insulation effects, which can improve the operating temperature and service life of the internal heating rotary kiln and reduce the heat loss of the rotary kiln; the inner and outer cylinder bodies adopt a guide rail popliteal connection method, which helps to keep the two coaxially rotating and leaves enough space for thermal expansion. In addition, the provision of the expansion joint in the thermal insulation layer can effectively limit the softening, deformation and bending of the cylinder body, reduce the cost of maintenance and replacement of the rotary kiln, significantly reduce its cost, and is easy to install, which helps to expand its application range.

[0011] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. Through the following technical solutions, the technical objectives and beneficial effects of the present invention can be better achieved and realized.

[0012] As a preferred technical solution of the present invention, the interior of the inner cylinder of the rotary kiln is a hollow structure and is not provided with a heat-insulating layer.

[0013] In the present invention, based on the design of the external insulation structure and the need to calcine materials, insulation materials such as refractory bricks are not provided inside the cylinder of the rotary kiln to prevent contamination of the calcined materials.

[0014] As a preferred technical solution of the present invention, the inner cylinder and the outer cylinder are both stainless steel cylinders, and the thermal insulation layer is a refractory material casting layer.

[0015] In the present invention, the inner cylinder and the outer cylinder are both made of stainless steel, and the stainless steel types include 304 stainless steel, 310 stainless steel, 310S stainless steel, 316L stainless steel, 314 stainless steel, etc. Different types of stainless steel can also be selected for installation, such as a combination of 310 stainless steel and 310S stainless steel, and a combination of 310S stainless steel and 316L stainless steel. This combination can mean that the outer cylinder and the inner cylinder are made of different types of stainless steel, or the same cylinder can be made of two types of stainless steel.

[0016] For the thermal insulation layer, refractory materials are used for pouring. The castables are first stirred into slurry by a mixer, and then vibrated and compacted to form the slurry. The refractory materials, i.e. castables, can be selected from alumina cement castables, self-leveling castables, low cement castables, phosphate castables, mullite castables, anti-dry slag castables, high-aluminum waste powder castables, clay powder castables, high-temperature cement castables, etc.

[0017] In the utility model, for pouring the thermal insulation layer, the inner cylinder and the mold are first separated into a pouring space to pour the thermal insulation layer, a powerful mixer is used to stir the castable into a slurry, and it is poured into the pouring space by a vibrating filler to ensure uniform and dense pouring; after the castable is completely cooled, the mold is removed, and the outer cylinder is pushed into the track to be slidably connected with the inner cylinder.

[0018] As a preferred technical solution of the present invention, the outer surface of the inner cylinder is welded with guide rail slots, and the number of the guide rail slots includes at least two, such as two, three, four, six or eight, etc., which are evenly distributed on the circumference of the outer surface.

[0019] As a preferred technical solution of the present invention, each of the guide rail slots is provided with at least one chute pipe, such as one, two or three, and the chute pipe is an arc-shaped groove pipe.

[0020] As a preferred technical solution of the present invention, pillars are welded on the inner surface of the outer cylinder, and the pillars are provided in at least two groups, such as two groups, three groups, four groups, six groups or eight groups, etc. The position of each group of pillars corresponds to the position of the guide rail slot on the outer surface of the inner cylinder.

[0021] As the preferred technical solution of the present invention, the number of each group of pillars is the same as the number of chute pipes in each guide rail slot, and the top structure of the pillars matches the structure of the chute pipes to form a popliteal connection structure, thereby ensuring the coaxial and concentric movement of the inner cylinder and the outer support insulation structure.

[0022] In the present invention, by designing the guide rail slots on the inner cylinder and the supports on the outer cylinder, the two can be fixed in a popliteal connection manner during installation, which can not only reserve sufficient space for thermal expansion, but also ensure that the inner and outer cylinders rotate coaxially; the material of the welding structure on the inner and outer cylinders is the same as that of the cylinder to ensure the stability of the welding.

[0023] As an optimal technical solution of the present invention, the expansion joints in the thermal insulation layer include radial expansion joints and transverse expansion joints. The radial expansion joints are evenly distributed in the circumference of the thermal insulation layer, and there are at least two of them. The transverse expansion joints are gaps between the thermal insulation layer and the inner wall of the outer cylinder, and the transverse expansion joints are filled with thermal insulation cotton.

[0024] In the present invention, the thermal insulation layer also has a cylindrical structure. By changing the castable ratio, an expansion joint can be reserved to reserve space for thermal expansion during the calcination process, thereby avoiding large deformation and bending of the cylinder under high temperature conditions, increasing the operating temperature of the high-temperature section cylinder of the rotary kiln, and extending its service life; thermal insulation cotton is filled in the transverse expansion joint, which can reduce the hard collision between the thermal insulation layer and the outer cylinder under high-temperature calcination conditions, thereby playing a role in buffering and protecting the cylinder.

[0025] As a preferred technical solution of the present invention, the rotary kiln is placed horizontally, and the moving direction of the calcined material in its inner cylinder is opposite to the direction of introduction of the fuel gas.

[0026] As a preferred technical solution of the present invention, a rotating assembly and a supporting assembly are provided below the rotary kiln.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] (1) The external support insulation structure of the utility model has excellent support, fixation and insulation effects by arranging a heat insulation layer and an outer cylinder on the outside of the inner cylinder, which can improve the operating temperature and service life of the internal heating rotary kiln and reduce the heat loss of the rotary kiln;

[0029] (2) The utility model adopts the guide rail popliteal connection method for the inner and outer cylinders, and the expansion joint is set in the thermal insulation layer, which can leave enough space for thermal expansion to effectively limit the softening, deformation and bending of the cylinder, thereby increasing the service life of the rotary kiln and reducing the cost of maintenance and replacement of the rotary kiln, thereby significantly reducing its cost;

[0030] (3) The external support insulation structure of the present invention is easy to install and has a reasonable structural design, which helps to expand its scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the external support and insulation structure of the internal heating rotary kiln provided in Example 1 of the present utility model;

[0032] Figure 2 This utility model Figure 1 Sectional view of the AA plane;

[0033] Figure 3 This utility model Figure 2 A partial enlarged view of

[0034] Among them, 1-inner cylinder, 2-thermal insulation layer, 3-outer cylinder, 4-popliteal connection structure, 5-radial expansion joint, 6-transverse expansion joint, 7-rotating component, 8-support component. DETAILED DESCRIPTION

[0035] In order to better illustrate the present invention and facilitate understanding of the technical solution of the present invention, the present invention is further described in detail below. However, the following embodiments are merely simple examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims.

[0036] The following are typical but non-limiting embodiments of the present invention:

[0037] Example 1:

[0038] This embodiment provides an external support insulation structure of an internal heating rotary kiln. The schematic diagram of the external support insulation structure is as follows: Figure 1 As shown, the cross-sectional view of the AA surface is as follows Figure 2 As shown, Figure 2 A partial enlarged picture of Figure 3 As shown, it includes a thermal insulation layer 2 and an outer cylinder 3 sequentially arranged on the outside of the inner cylinder 1 of the rotary kiln, the inner cylinder 1 and the outer cylinder 3 are arranged to rotate coaxially, and the cavity between the inner cylinder 1 and the outer cylinder 3 is filled with the thermal insulation layer 2; the inner cylinder 1 and the outer cylinder 2 adopt a guide rail popliteal connection structure 4, and an expansion joint is provided in the thermal insulation layer 2 to divide it into several thermal insulation units.

[0039] The interior of the inner cylinder 1 of the rotary kiln is a hollow structure and is not provided with a heat-insulating layer.

[0040] The inner cylinder 1 and the outer cylinder 3 are both stainless steel cylinders, specifically 310S stainless steel, and the thermal insulation layer 2 is a refractory material casting layer.

[0041] The outer surface of the inner cylinder 1 is welded with guide rail slots, and the number of the guide rail slots is three and is evenly distributed on the circumference of the outer surface.

[0042] Two chute pipes are provided in each guide rail slot, and the chute pipes are arc-shaped groove pipes.

[0043] Supports are welded on the inner surface of the outer cylinder 3 , and there are three groups of support posts. The position of each group of support posts corresponds to the position of the guide rail slots on the outer surface of the inner cylinder 1 .

[0044] The number of pillars in each group is the same as the number of chute pipes in each guide rail slot, and the top structure of the pillars matches the structure of the chute pipes to form a popliteal fossa-shaped connection structure 4.

[0045] The expansion joints in the thermal insulation layer 2 include radial expansion joints 5 and transverse expansion joints 6. The radial expansion joints 5 are evenly distributed in the circumference of the thermal insulation layer 2, and there are three of them. The transverse expansion joints 6 are gaps between the thermal insulation layer 2 and the inner wall of the outer cylinder 3. The transverse expansion joints 6 are filled with thermal insulation cotton.

[0046] The rotary kiln is placed horizontally, and the direction of movement of the calcined material in its inner cylinder 1 is opposite to the direction of introduction of the fuel gas; the calcined material is praseodymium carbonate, and the fuel gas is natural gas.

[0047] A rotating assembly 7 and a supporting assembly 8 are provided below the rotary kiln.

[0048] Example 2:

[0049] This embodiment provides an external support insulation structure for an internally heated rotary kiln, wherein the external support insulation structure includes a thermal insulation layer 2 and an outer cylinder 3 sequentially arranged on the outside of an inner cylinder 1 of the rotary kiln, wherein the inner cylinder 1 and the outer cylinder 3 are arranged to rotate coaxially, and the cavity between the inner cylinder 1 and the outer cylinder 3 is filled with the thermal insulation layer 2; the inner cylinder 1 and the outer cylinder 2 adopt a guide rail popliteal connection structure 4, and an expansion joint is provided in the thermal insulation layer 2 to separate it into a plurality of thermal insulation units.

[0050] The interior of the inner cylinder 1 of the rotary kiln is a hollow structure and is not provided with a heat-insulating layer.

[0051] The inner cylinder 1 and the outer cylinder 3 are both stainless steel cylinders, specifically 304 stainless steel, and the thermal insulation layer 2 is a refractory material casting layer.

[0052] The outer surface of the inner cylinder 1 is welded with guide rail slots, and the number of the guide rail slots is four and they are evenly distributed on the circumference of the outer surface.

[0053] A chute pipe is provided in each guide rail slot, and the chute pipe is an arc-shaped groove pipe.

[0054] Supports are welded on the inner surface of the outer cylinder 3 , and there are four groups of support. The position of each group of support corresponds to the position of the guide rail slot on the outer surface of the inner cylinder 1 .

[0055] The number of pillars in each group is the same as the number of chute pipes in each guide rail slot, and the top structure of the pillars matches the structure of the chute pipes to form a popliteal fossa-shaped connection structure 4.

[0056] The expansion joints in the thermal insulation layer 2 include radial expansion joints 5 and transverse expansion joints 6. The radial expansion joints 5 are evenly distributed in the circumference of the thermal insulation layer 2, and there are four of them. The transverse expansion joints 6 are gaps between the thermal insulation layer 2 and the inner wall of the outer cylinder 3. The transverse expansion joints 6 are filled with thermal insulation cotton.

[0057] The rotary kiln is placed horizontally, and the direction of movement of the calcined material in its inner cylinder 1 is opposite to the direction of introduction of the fuel gas; the calcined material is neodymium carbonate, and the fuel gas is natural gas.

[0058] A rotating assembly 7 and a supporting assembly 8 are provided below the rotary kiln.

[0059] Example 3:

[0060] This embodiment provides an external support insulation structure for an internally heated rotary kiln, wherein the external support insulation structure includes a thermal insulation layer 2 and an outer cylinder 3 sequentially arranged on the outside of an inner cylinder 1 of the rotary kiln, wherein the inner cylinder 1 and the outer cylinder 3 are arranged to rotate coaxially, and the cavity between the inner cylinder 1 and the outer cylinder 3 is filled with the thermal insulation layer 2; the inner cylinder 1 and the outer cylinder 2 adopt a guide rail popliteal connection structure 4, and an expansion joint is provided in the thermal insulation layer 2 to separate it into a plurality of thermal insulation units.

[0061] The interior of the inner cylinder 1 of the rotary kiln is a hollow structure and is not provided with a heat-insulating layer.

[0062] The inner cylinder 1 and the outer cylinder 3 are both stainless steel cylinders, both of which are welded by combining 316L stainless steel and 310S stainless steel. The thermal insulation layer 2 is a refractory material casting layer.

[0063] The outer surface of the inner cylinder 1 is welded with guide rail slots, and the number of the guide rail slots is two and they are evenly distributed on the circumference of the outer surface.

[0064] Three chute pipes are provided in each guide rail slot, and the chute pipes are arc-shaped groove pipes.

[0065] Supports are welded on the inner surface of the outer cylinder 3 , and there are two groups of support posts. The position of each group of support posts corresponds to the position of the guide rail slots on the outer surface of the inner cylinder 1 .

[0066] The number of pillars in each group is the same as the number of chute pipes in each guide rail slot, and the top structure of the pillars matches the structure of the chute pipes to form a popliteal fossa-shaped connection structure 4.

[0067] The expansion joints in the thermal insulation layer 2 include radial expansion joints 5 and transverse expansion joints 6. The radial expansion joints 5 are evenly distributed in the circumference of the thermal insulation layer 2, and there are three of them. The transverse expansion joints 6 are gaps between the thermal insulation layer 2 and the inner wall of the outer cylinder 3. The transverse expansion joints 6 are filled with thermal insulation cotton.

[0068] The rotary kiln is placed horizontally, and the direction of movement of the calcined material in its inner cylinder 1 is opposite to the direction of introduction of the fuel gas; the calcined material is a mixed salt of praseodymium carbonate and neodymium carbonate, and the fuel gas is shale gas.

[0069] A rotating assembly 7 and a supporting assembly 8 are provided below the rotary kiln.

[0070] The internal heating rotary kiln in the above embodiment is used to calcine rare earth materials. Through the design and installation of the external support insulation structure, the conduit groove is first welded on the outside of the inner cylinder, and then the mold is spliced ​​with it. The refractory material is poured into the cavity formed by the two. During the pouring process of the thermal insulation layer, the expansion joint is reserved by changing the castable ratio. After the castable is cooled, the mold is removed, and the outer cylinder and the inner cylinder with the welded support structure are slid and assembled to achieve a popliteal connection, ensuring that the inner and outer cylinders rotate coaxially and are not prone to bending or deformation during high-temperature calcination.

[0071] From the above embodiments, it can be seen that the external support insulation structure of the present invention has excellent support, fixation and insulation effects by arranging a thermal insulation layer and an outer cylinder on the outside of the inner cylinder, which can improve the operating temperature and service life of the internal heating rotary kiln and reduce the heat loss of the rotary kiln; in the present invention, the inner and outer cylinders adopt a guide rail popliteal connection method, and the expansion joint is set in the thermal insulation layer, which can leave enough thermal expansion space to effectively limit the softening, deformation and bending of the cylinder, improve the service life of the rotary kiln, and reduce the cost of maintenance and replacement of the rotary kiln, so as to significantly reduce its construction cost; the external support insulation structure is easy to install and has a reasonable structural design, which helps to expand its application range.

[0072] The applicant declares that while the above-described embodiments illustrate the detailed apparatus of the present invention, the present invention is not limited to the above-described detailed apparatus, nor does it imply that the present invention must rely on the above-described detailed apparatus in order to be implemented. Persons skilled in the art should understand that any improvements to the present invention, equivalent replacements for the apparatus of the present invention, additions of auxiliary devices, and selections of specific methods, etc., fall within the scope of protection and disclosure of the present invention.

Claims

1. An external support insulation structure for an internal heating rotary kiln, characterized in that: The external support insulation structure includes a thermal insulation layer and an outer cylinder which are sequentially arranged on the outside of the inner cylinder of the rotary kiln. The inner cylinder and the outer cylinder are arranged to rotate coaxially, and the cavity between the inner cylinder and the outer cylinder is filled with the thermal insulation layer; the inner cylinder and the outer cylinder are connected in a popliteal shape using a guide rail, and an expansion joint is provided in the thermal insulation layer to separate it into a number of thermal insulation units.

2. The external support and insulation structure of the internal heating rotary kiln according to claim 1, characterized in that: The interior of the inner cylinder of the rotary kiln is a hollow structure and is not provided with a heat-insulating layer.

3. The external support and insulation structure of the internal heating rotary kiln according to claim 1, characterized in that: The inner cylinder and the outer cylinder are both stainless steel cylinders, and the thermal insulation layer is a refractory material casting layer.

4. The external support and insulation structure of the internal heating rotary kiln according to claim 1, characterized in that: The outer surface of the inner cylinder is welded with guide rail slots, and the number of the guide rail slots includes at least two and is evenly distributed on the circumference of the outer surface.

5. The external support and insulation structure of the internal heating rotary kiln according to claim 4, characterized in that: At least one chute pipe is provided in each guide rail slot, and the chute pipe is an arc-shaped groove pipe.

6. The external support and insulation structure of the internal heating rotary kiln according to claim 5, characterized in that: Pillars are welded on the inner surface of the outer cylinder, and there are at least two groups of pillars. The position of each group of pillars corresponds to the position of the guide rail slots on the outer surface of the inner cylinder.

7. The external support and insulation structure of the internal heating rotary kiln according to claim 6, characterized in that: The number of each group of pillars is the same as the number of chute pipes in each guide rail slot, and the top structure of the pillars matches the structure of the chute pipes to form a popliteal connection structure.

8. The external support and insulation structure of the internal heating rotary kiln according to claim 1, characterized in that: The expansion joints in the thermal insulation layer include radial expansion joints and transverse expansion joints. The radial expansion joints are evenly distributed in the circumference of the thermal insulation layer, and there are at least two of them. The transverse expansion joints are gaps between the thermal insulation layer and the inner wall of the outer cylinder, and the transverse expansion joints are filled with thermal insulation cotton.

9. The external support and insulation structure of the internal heating rotary kiln according to claim 1, characterized in that: The rotary kiln is placed horizontally, and the moving direction of the calcined material in the inner cylinder is opposite to the direction of the fuel gas introduction.

10. The external support and insulation structure of the internal heating rotary kiln according to claim 1, characterized in that: A rotating assembly and a supporting assembly are provided below the rotary kiln.

Images