Vertical calcining kiln

Abstract

The utility model discloses a vertical calcining kiln, and belongs to the technical field of calcining kilns, the vertical calcining kiln comprises a kiln body, the side wall of the top of the kiln body is also provided with a first smoke outlet, a top cover of the kiln body is provided with a second smoke outlet, and a bottom plate of the kiln body is provided with a discharge port; a temperature and humidity sensor, a carbon and oxygen sensor and a temperature controller are arranged on the side wall of each layer of calcining furnace chamber, a combustion chamber is formed in the side wall of each layer of calcining furnace chamber, and a gas burner and a combustion fan which are used for regulating and controlling the calcining temperature, the air volume and the carbon and oxygen content of the calcining furnace chamber are arranged in the combustion chamber; and each layer of kiln bed comprises a refractory pouring block assembly. The kiln bed is constructed through the refractory pouring assembly, the effect of preventing the kiln bed from being extruded and deformed due to thermal shock (thermal expansion and cold contraction) is achieved, it is ensured that the kiln bed is flat, the gap between the kiln bed and the rake arm is prevented from being enlarged, and returned materials are effectively reduced; meanwhile, the process parameters of each layer of calcining furnace chamber are regulated and controlled through a gas burner and a combustion fan, so that different process requirements are met.

Description

Technical Field

[0001] This application relates to the field of calcining kiln technology, and in particular, to a vertical calcining kiln. Background Technology

[0002] The information provided in this section is for the purpose of generally presenting the background of this application. To the extent described in this section, the work of the currently named inventors and aspects of the description that may not constitute prior art at the time of filing are neither explicitly nor implicitly considered to be prior art of this application.

[0003] The production of ultrafine calcined kaolin involves processing kaolin-type coal gangue into powder through ultrafine processing, followed by high-temperature calcination to undergo a series of physicochemical reactions, resulting in a product with high whiteness and various application performance indicators. Currently, rotary kilns are generally used to achieve high-temperature calcination of kaolin powder.

[0004] Kaolin powder is conveyed into the rotary kiln from the kiln head. As the kiln cylinder rotates and the inner wall lifters act, it is pushed towards the kiln tail, where it comes into full contact with the high-temperature flue gas sent in counter-currently by the burner and combustion air fan, achieving continuous calcination of the kaolin powder. However, existing rotary kilns have metal cylinders, and the inner wall must be cast with a refractory insulation layer. During long-term operation, the refractory insulation layer is prone to loosening and falling off due to high temperature and friction and impact from the powder, which can easily damage the rotary kiln cylinder. This can cause refractory material debris to mix into the product, leading to product quality problems.

[0005] For example, Chinese Patent Publication No. CN102022905A discloses a multi-furnace vertical calcination device and calcination method, including: a furnace shell; multiple horizontally arranged furnace beds inside the furnace shell, each with material passage holes; multiple stirring rakes, each positioned above a corresponding furnace bed; and a rotating shaft connected to the stirring rakes and driving them to rotate. The furnace shell contains multiple horizontally arranged furnace beds with material passage holes; multiple stirring rakes are positioned above each corresponding furnace bed; and the rotating shaft drives the stirring rakes to rotate. The calcining material falls from the top of the calcination device onto the furnace bed. The rotating shaft drives the stirring rakes above the furnace bed to rotate, causing the calcining material to move through the rake teeth and ensuring an appropriate residence time on the furnace bed, ultimately entering the lower furnace bed through the material passage holes. By changing the speed of the rotating shaft, the residence time of the material can be easily diversified. Using the stirring rakes to drive the calcining material to rotate, the numerous rake teeth on the stirring rakes continuously agitate the calcining material, ensuring uniform heating and resulting in a uniform calcined product.

[0006] Existing vertical calcining kilns have the following technical problems: The kiln beds within the kiln are prone to deformation and twisting under high-temperature conditions, resulting in uneven kiln beds. This leads to increased gaps between the rake arms and the kiln beds, severe material backflow, and potential damage to the rake arms and kiln beds. Furthermore, refractory debris may mix into the product, causing defects and necessitating kiln shutdowns for maintenance. The lengthy maintenance cycle significantly impacts production efficiency. Additionally, the kiln space makes it difficult to control calcination temperature, calcination time, and atmosphere (oxygen and carbon content in the flue gas), making it unsuitable for products with different calcination process requirements, such as products requiring rapid calcination, products requiring high-temperature calcination, and products requiring only medium-temperature calcination.

[0007] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0008] In view of at least one of the above technical problems, this application provides a vertical calcining kiln, which can construct the kiln bed through refractory casting components to prevent the kiln bed from being deformed by thermal shock (thermal expansion and contraction), ensure the flatness of the kiln bed and avoid increasing the gap between the kiln bed and the rake arm, and effectively reduce material return; at the same time, the process parameters of each layer of calcining furnace cavity can be adjusted by gas burner and combustion fan to adapt to different process requirements.

[0009] According to one aspect of this application, a vertical calcining kiln is provided, including a kiln body, in which multiple kiln beds are arranged from top to bottom, and a feeding port is opened on the kiln beds. A rotatable main shaft is arranged in the kiln body, passing through the multiple kiln beds in sequence. Rake arm assemblies for pushing and feeding materials on the kiln beds are arranged at intervals on the main shaft. A feeding assembly for feeding is arranged on the top side wall of the kiln body. A first exhaust port is also opened on the top side wall of the kiln body. A second exhaust port is opened on the top cover of the kiln body. A discharge port is opened on the bottom plate of the kiln body.

[0010] The kiln beds and the side walls of the kiln body enclose each other to form a multi-layered calcining furnace cavity for calcining materials. Temperature and humidity sensors, carbon and oxygen sensors and temperature controllers are installed on the side walls of each calcining furnace cavity. Combustion chambers are opened on the side walls of each calcining furnace cavity. Gas burners and combustion fans are installed in the combustion chambers to regulate the calcining temperature, air volume and carbon and oxygen content of the calcining furnace cavity.

[0011] Each layer of the kiln bed includes a refractory castable block assembly, which includes a grid frame. The grid frame encloses and forms a grid arranged in multiple rings, and refractory castable blocks are cast within the grid.

[0012] In some embodiments of this application, each calcination furnace cavity is divided into four groups from top to bottom with progressively higher maximum temperatures: a preheating calcination layer, a medium-temperature calcination layer, a high-temperature calcination layer, and a heat-insulating calcination layer.

[0013] In some embodiments of this application, the grid border includes a frame made of high-temperature resistant stainless steel, and aluminum silicate insulation cotton is provided inside the frame.

[0014] In some embodiments of this application, the feeding assembly includes a feeding frame with openings on the top and one side. The opening side of the feeding frame is connected to the side wall of the kiln body. The feeding frame is used to connect to the tail end of the screw conveyor and receive the material conveyed by the screw conveyor into the kiln body.

[0015] In some embodiments of this application, a sealing cover is hinged to the top of the feed frame, which is used to cover and seal the opening at the top of the feed frame.

[0016] In some embodiments of this application, the bottom plate of the feed frame has a sloping structure and is inclined downward toward the kiln body axis.

[0017] In some embodiments of this application, both the first and second smoke exhaust ports are used to connect to a dust collector.

[0018] In some embodiments of this application, observation windows are provided on the side walls of each calcination furnace cavity, and observation and maintenance doors are provided at the observation windows to shield and protect them.

[0019] In some embodiments of this application, a cold air mechanism is provided below the kiln body. The rake arm assembly includes a rake arm and rake teeth. The rake arm is connected to the main shaft, and the rake teeth are arranged below the rake arm. Both the main shaft and the rake arm are hollow structures, and the internal hollow structures of the main shaft and the rake arm are interconnected. The cold air mechanism is connected to the internal hollow structure of the main shaft. The cold air mechanism is used to blow cold air into the interior of the main shaft and the rake arm.

[0020] In some embodiments of this application, the drive mechanism is located below the kiln body and is connected to the bottom end of the main shaft extending outside the bottom plate of the kiln body. The drive mechanism is used to drive the main shaft to rotate.

[0021] This application has the following beneficial effects:

[0022] The vertical calcining kiln of this application constructs the kiln bed using refractory casting components. The grid border of the refractory casting components can be enclosed to form multiple ring-shaped arrays of grids. Refractory casting blocks are cast inside the grids, which provides good refractory effect and higher overall strength. This prevents the kiln bed from deforming due to thermal expansion and contraction, ensures the flatness of the kiln bed, avoids increasing the gap between the kiln bed and the rake arm components, and effectively reduces material return.

[0023] This application increases the feed rate and reduces the exhaust gas velocity by feeding material through a feeding assembly on the top sidewall of the kiln body, and simultaneously opening a first exhaust port on the top sidewall and a second exhaust port on the top cover of the kiln body. This effectively reduces dust generation inside the kiln. Furthermore, the structural modification of the kiln bed effectively reduces material return, thereby increasing output. In summary, the kiln bed is less prone to damage, preventing refractory debris from affecting product quality, and output is significantly increased.

[0024] This application incorporates temperature and humidity sensors, carbon and oxygen sensors, and temperature controllers on the side walls of each calcination chamber. This allows for real-time monitoring of the temperature and atmosphere within the kiln at each chamber level. Data signals are transmitted to the central control room, where operators implement adjustments based on process requirements. Each calcination chamber has a combustion chamber on its side wall, equipped with a gas burner and combustion-supporting fan to regulate the calcination temperature, airflow, and carbon and oxygen content. This facilitates the setting of calcination process parameters, particularly temperature profiles, preventing under-calcination and over-calcination, effectively reducing energy consumption and costs. This allows the application to adapt to products with different calcination process requirements, such as those requiring rapid calcination, high-temperature calcination, or only medium-temperature calcination, significantly expanding its applicability.

[0025] Of course, any product implementing this application does not necessarily need to achieve all the advantages described above simultaneously. In addition to the purposes, features, and advantages described above, this application also has other purposes, features, and advantages. The application will be further described in detail below with reference to figures. Attached Figure Description

[0026] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0027] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the kiln bed structure according to a preferred embodiment of this application;

[0029] Figure 3 This is a schematic diagram showing the segmentation of each layer of the calcination furnace cavity in a preferred embodiment of this application;

[0030] Figure 4 This is a schematic diagram of the connection between the drive mechanism and the spindle in a preferred embodiment of this application;

[0031] Legend: 1. Kiln body; 11. Feeding assembly; 111. Sealing cover; 12. First flue gas outlet; 13. Second flue gas outlet; 14. Discharge port; 15. Observation window; 16. Observation and maintenance door; 17. Top cover; 2. Main shaft; 3. Kiln bed; 31. First kiln bed; 311. First discharge port; 32. Second kiln bed; 321. Second discharge port; 322. Material blocking part; 323. Wind baffle; 4. Rake arm assembly; 41. Rake arm; 42. Rake teeth; 5. Calcination furnace cavity; 51. Preheating calcination layer; 52. Medium-temperature calcination layer; 53. High-temperature calcination layer; 54. Insulating calcination layer; 6. Refractory castable block assembly; 61. Grid frame; 62. Refractory castable block; 7. Cold air mechanism; 8. Drive mechanism; 81. Bevel gear pair assembly; 9. Discharge pipe. Detailed Implementation

[0032] The embodiments of this application are described in detail below with reference to the accompanying drawings; however, this application may be implemented in a variety of different ways as defined and covered below.

[0033] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of this application; Figure 2 This is a schematic diagram of the kiln bed structure according to a preferred embodiment of this application; Figure 3 This is a schematic diagram showing the segmentation of each layer of the calcination furnace cavity in a preferred embodiment of this application; Figure 4 This is a schematic diagram of the connection between the drive mechanism and the spindle in a preferred embodiment of this application.

[0034] A vertical calcining kiln includes a kiln body 1, with multiple kiln beds 3 arranged from top to bottom inside the kiln body 1. Each kiln bed 3 has a feeding port. A rotatable main shaft 2 is arranged inside the kiln body 1, passing through the multiple kiln beds 3 in sequence. Rake arm assemblies 4 are arranged at intervals on the main shaft 2 for pushing and feeding materials spread on the kiln beds 3. A feeding assembly 11 for feeding is arranged on the top side wall of the kiln body 1. A first exhaust port 12 is also opened on the top side wall of the kiln body 1. A second exhaust port 13 is opened on the top cover 17 of the kiln body 1. A discharge port 14 is opened on the bottom plate of the kiln body 1.

[0035] The kiln beds 3 are enclosed by the side walls of the kiln body 1 to form a multi-layered calcining furnace cavity 5 for calcining materials. Temperature and humidity sensors, carbon and oxygen sensors and temperature controllers are installed on the side walls of each calcining furnace cavity 5. Combustion chambers are opened on the side walls of each calcining furnace cavity 5. Gas burners and combustion fans are installed in the combustion chambers to regulate the calcination temperature, air volume and carbon and oxygen content of the calcining furnace cavity 5.

[0036] Each layer of kiln bed 3 includes a refractory castable block assembly 6. The refractory castable block assembly 6 includes a grid frame 61, which encloses a grid arranged in multiple ring arrays. Refractory castable blocks 62 are cast inside the grid.

[0037] Here, "kiln bed 3" refers to a multi-layered structure within the kiln body 1 used to receive materials. In some embodiments, the kiln bed 3 is a plate-like structure. Optionally, the kiln bed 3 includes a first kiln bed 31 and a second kiln bed 32. The upper surfaces of both the first kiln bed 31 and the second kiln bed 32 are inclined surfaces and both slope upwards towards the axis of the main shaft 2. The outer edge of the first kiln bed 31 is connected to the inner wall of the kiln body 1, and a first discharge port 311 is provided in the middle of the first kiln bed 31 for the main shaft 2 to pass through and for discharging materials. The second kiln bed 32 is connected to the inner wall of the kiln body 1, and a second discharge port 321 is provided on the second kiln bed 32. The second discharge port 321 is staggered from the first discharge port 311 to reduce the material discharge speed. The second kiln bed 32 has a central hole in the middle for the main shaft 2 to pass through. The side wall of the central hole is provided with a protruding material blocking part 322. Multiple baffle plates 323 are provided on the main shaft 2 at intervals. The baffle plates 323 are used to block the gap between the material blocking part 322 and the side wall of the main shaft 2 near the material blocking part 322, so as to reduce the amount of material discharged from this gap.

[0038] The vertical calcining kiln of this application constructs the kiln bed 3 through the refractory castable block assembly 6. The grid frame 61 of the refractory castable block assembly 6 can be enclosed to form a grid arranged in multiple rings. Refractory castable blocks 62 are cast inside the grid, which achieves good refractory effect and higher overall strength. This prevents the kiln bed 3 from deforming due to thermal expansion and contraction, ensures the flatness of the kiln bed 3, avoids the increase of the gap between the kiln bed 3 and the rake arm assembly 4, and effectively reduces material return.

[0039] This application increases the feed rate and reduces the exhaust velocity by feeding material through the feeding assembly 11 on the top side wall of the kiln body 1, while simultaneously opening a first exhaust port 12 on the top side wall of the kiln body 1 and a second exhaust port 13 on the top cover 17 of the kiln body 1. This effectively reduces dust generation inside the kiln. Furthermore, the structural modification of the kiln bed 3 effectively reduces material return, thereby increasing output. In summary, the kiln bed 3 is less prone to damage, preventing refractory material debris from affecting product quality, and output is significantly increased. This application also incorporates temperature and humidity sensors, carbon and oxygen sensors, and temperature controllers on the side walls of each calcination chamber 5, allowing real-time monitoring of the temperature and atmosphere within the kiln. The data signals are transmitted to the central control room, where operators implement adjustments according to process requirements. Each calcination furnace cavity 5 has a combustion chamber on its side wall. The combustion chamber is equipped with a gas burner and a combustion-supporting fan for regulating the calcination temperature, air volume and carbon and oxygen content of the calcination furnace cavity 5. This facilitates the setting of calcination process parameters for each layer, especially the temperature curve, and prevents under-calcination and over-calcination, effectively reducing energy consumption and costs. This allows the furnace to adapt to products with different calcination process requirements, such as products that require rapid calcination, products that require high-temperature calcination, and products that only require medium-temperature calcination.

[0040] Preferably, please refer to Figure 3As shown, each layer of the calcining furnace cavity 5 is divided into four groups from top to bottom with the highest temperature increasing sequentially: preheating calcining layer 51, medium-temperature calcining layer 52, high-temperature calcining layer 53, and heat-insulating calcining layer 54.

[0041] Understandably, by controlling each layer of the calcination furnace cavity 5 in layers and sections, the calcination temperature, calcination time, and atmosphere of each layer can be flexibly adjusted according to the product manufacturing process requirements. The calcination temperature of each layer can be precisely controlled, and the rotation speed of the main shaft 2 and the rake arm assembly 4 can be adjusted to adjust the product calcination time. This allows the product to adapt to different calcination process requirements, such as products that require rapid calcination, products that require high-temperature calcination, and products that only require medium-temperature calcination.

[0042] In one embodiment, the calcination furnace cavity 5 has ten layers, divided from top to bottom into a preheating calcination layer 51 (layers 1 to 3), a medium-temperature calcination layer 52 (layers 4 to 6), a high-temperature calcination layer 53 (layers 7 to 8), and a heat-insulating calcination layer 54 (layers 9 to 10). In practical applications, the calcination of high-whiteness ultrafine calcined kaolin for papermaking is specifically applied as follows: the preheating calcination layer 51 has a controlled temperature from top to bottom: layer 1 ≤ 220℃, layer 2 ≤ 350℃, layer 3 ≤ 450℃, with a strong oxidizing atmosphere; its main function is to remove mechanical water through evaporation. The medium-temperature calcination layer 52 has a controlled temperature from top to bottom: layer 4 ≤ 560℃, layer 5 ≤ 750℃, layer 6 ≤ 850℃, with a strong oxidizing atmosphere; its main function is to remove crystal water through decomposition, decompose carbonates and sulfates, and achieve crystal form conversion. Organic matter is decomposed and eliminated; the high-temperature calcination layer 53 controls the temperature of the 7th layer ≤950℃ and the 8th layer ≤1050℃, with a weak reducing atmosphere. Its main function is to form a stable aluminum-silicon spinel crystal structure, and reduce high-valence colored iron-titanium oxide impurities to low-valence light-colored oxides, resulting in products with high whiteness, stable chemical properties, and optical and electrical insulation properties; the heat-insulating calcination layer 54 controls the temperature of the ≤1050℃, with a neutral atmosphere. Its main function is to heat-insulate and calcinate for a certain period of time to further balance and stabilize the product quality and performance.

[0043] Preferably, please refer to Figure 2 As shown, the grid frame 61 includes a frame made of high-temperature resistant stainless steel, and aluminum silicate insulation cotton is installed inside the frame.

[0044] Understandably, the kiln bed 3 comprises refractory castable block components 6. The kiln bed 3 has an overall grid structure, with the grid frame 61 consisting of a frame made of high-temperature resistant stainless steel. The frame contains aluminum silicate insulation cotton, which prevents the kiln bed 3 from deforming due to thermal shock (thermal expansion and contraction). The refractory castable blocks 62 are cast from refractory materials and have excellent refractory properties. They also ensure the flatness of the kiln bed 3 and maintain a small gap between the kiln bed 3 and the rake arm assembly 4, effectively reducing material return.

[0045] Preferably, please refer to Figure 1and 2 As shown, the feeding assembly 11 includes a feeding frame with openings on the top and one side. The opening side of the feeding frame is connected to the side wall of the kiln body 1. The feeding frame is used to connect to the tail end of the screw conveyor and receive the material conveyed by the screw conveyor into the kiln body 1.

[0046] In this preferred embodiment, a sealing cover 111 is hinged to the top of the feed frame, and the sealing cover 111 is used to cover and seal the opening at the top of the feed frame.

[0047] Understandably, the material is conveyed by a screw conveyor into the feed frame, which then directly enters the kiln body 1. The feed frame has an open top. To protect the feed frame, a sealing cover 111 is hinged to the top. When feeding is not required, the sealing cover 111 covers the top opening of the feed frame, providing a sealed protection. When feeding is needed, simply flipping the sealing cover 111 open is sufficient, making operation very convenient.

[0048] Alternatively, please refer to Figure 1 As shown, the bottom plate of the feed frame has a sloping structure and tilts downward toward the axis of the kiln body 1.

[0049] Understandably, after the material is conveyed to the feed frame by the screw conveyor, the bottom plate of the feed frame is a sloping structure that slopes downward toward the axis of the kiln body 1, which allows the material to quickly enter the kiln body 1 under the action of gravity, reducing the accumulation of material in the feed frame.

[0050] Preferably, please refer to Figure 1 As shown, both the first exhaust port 12 and the second exhaust port 13 are used to connect to the dust collector.

[0051] Understandably, the first exhaust port 12 and the second exhaust port 13 serve to discharge flue gas. To reduce air pollution caused by the discharged flue gas, both the first exhaust port 12 and the second exhaust port 13 are connected to a dust collector to remove dust from the flue gas before discharge, effectively ensuring green production. The arrangement of the two exhaust ports can effectively reduce the exhaust gas velocity, which is beneficial to reducing dust in the kiln.

[0052] Preferably, please refer to Figure 1 and 2 As shown, each layer of the calcining furnace cavity 5 has an observation window 15 on its side wall, and an observation and maintenance door 16 is provided at the observation window 15 to shield and protect the observation window 15.

[0053] Understandably, the observation window 15 is designed to facilitate observation of the conditions in each calcination chamber 5, allowing workers to monitor the kiln 1 at any time and ensure safe production. Simultaneously, the observation window 15 also facilitates maintenance of the components inside each calcination chamber 5. The observation and maintenance door 16 can be normally closed to protect the observation window 15; when needed, it can be opened for convenient observation or maintenance operations.

[0054] Optionally, the observation and maintenance door 16 is made of high-temperature resistant glass, which allows for more convenient and intuitive observation of the conditions inside the calcination furnace chamber 5.

[0055] Preferably, please refer to Figure 1 As shown, a cold air mechanism 7 is provided below the kiln body 1. The rake arm assembly 4 includes a rake arm 41 and rake teeth 42. The rake arm 41 is connected to the main shaft 2, and the rake teeth 42 are arranged below the rake arm 41. Both the main shaft 2 and the rake arm 41 are hollow structures, and the internal hollow structures of the main shaft 2 and the rake arm 41 are interconnected. The cold air mechanism 7 is connected to the internal hollow structure of the main shaft 2. The cold air mechanism 7 is used to blow cold air into the interior of the main shaft 2 and the rake arm 41.

[0056] It is understandable that by blowing cold air into the interior of the main shaft 2 and the rake arm 41 through the cold air mechanism 7, the main shaft 2 and the rake arm 41 can be cooled down, which is beneficial to improving the service life of the parts. The high-temperature gas in the kiln body 1 can be discharged through the first exhaust port 12 and the second exhaust port 13.

[0057] Optionally, the cooling mechanism 7 uses a fan, and using standard and mature components helps to reduce procurement and maintenance costs.

[0058] Preferably, please refer to Figure 1 As shown, the drive mechanism 8 is located below the kiln body 1. The drive mechanism 8 is connected to the bottom end of the main shaft 2 that extends out of the bottom plate of the kiln body 1. The drive mechanism 8 is used to drive the main shaft 2 to rotate.

[0059] Understandably, by placing the drive mechanism 8 outside the kiln body 1, a safe operating environment for the drive mechanism 8 can be effectively guaranteed, and the service life of the components can be ensured. Optionally, the drive mechanism 8 is a motor, which is connected to the main shaft 2 through a bevel gear pair assembly 81, thereby achieving stable drive of the main shaft 2.

[0060] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0061] This document uses specific examples to illustrate the principles and implementation methods of this application. The examples are merely for the purpose of helping to understand the method and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, and the existence of an infinite number of specific structures, those skilled in the art can make various improvements, modifications, or variations without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, variations, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered as protected by this application.

Claims

1. A vertical calcining kiln, comprising a kiln body (1), a plurality of kiln beds (3) are arranged in the kiln body (1) from top to bottom, a discharge port is arranged on the kiln bed (3), a rotatable main shaft (2) is arranged in the kiln body (1) and penetrates the plurality of kiln beds (3) in sequence, a plurality of rake arm assemblies (4) are arranged on the main shaft (2) at intervals and used for pushing the material on the spread kiln bed (3) to discharge, the main shaft (2) is connected with a driving mechanism (8), and the driving mechanism (8) is used for driving the main shaft (2) to rotate, characterized in that, The top side wall of the kiln body (1) is provided with a feeding assembly (11) for feeding, and a first smoke exhaust port (12) is formed in the top side wall of the kiln body (1), and a second smoke exhaust port (13) is formed in the top cover (17) of the kiln body (1), and a discharge port (14) is formed in the bottom plate of the kiln body (1); The side walls of each layer of kiln beds (3) and the kiln body (1) form a multi-layer calcination furnace cavity (5) for calcining materials, and a temperature and humidity sensor, a carbon oxygen sensor and a temperature controller are arranged on the side wall of each layer of calcination furnace cavities (5), and a combustion chamber is formed in the side wall of each layer of calcination furnace cavities (5), and a gas combustion machine and a combustion air fan are arranged in the combustion chamber for adjusting the calcination temperature, air volume and carbon oxygen content of the calcination furnace cavity (5). Each layer of kiln beds (3) comprises a refractory cast block assembly (6), and the refractory cast block assembly (6) comprises a grid frame (61), and the grid frame (61) forms a plurality of annularly arranged grids, and the grids are filled with refractory cast blocks (62).

2. A vertical calciner according to claim 1, wherein Each layer of calcination furnace cavities (5) is divided into four groups from top to bottom, and the highest temperature is successively increased, which are preheating calcination layer (51), medium temperature calcination layer (52), high temperature calcination layer (53) and heat preservation calcination layer (54).

3. A vertical calciner according to claim 1, wherein The grid frame (61) comprises a frame body made of high-temperature-resistant stainless steel, and the frame body is provided with aluminum silicate thermal insulation cotton.

4. A vertical calciner according to claim 1, wherein The feeding assembly (11) comprises a feeding frame with an opening on the top and one side, and the opening side of the feeding frame is communicated with the side wall of the kiln body (1), and the feeding frame is connected with the tail end of the screw conveyor and receives the materials conveyed by the screw conveyor into the kiln body (1).

5. A vertical calciner according to claim 4, wherein The top of the feeding frame is hinged with a sealing cover (111), which is used to shield and seal the opening at the top of the feeding frame.

6. A vertical calciner according to claim 4, wherein The bottom plate of the feeding frame is inclined and inclined downward toward the axis of the kiln body (1).

7. A vertical calciner according to claim 1, wherein The first smoke exhaust port (12) and the second smoke exhaust port (13) are connected with the dust remover.

8. A vertical calciner kiln as claimed in claim 1, wherein, An observation window (15) is formed in the side wall of each layer of calcination furnace cavities (5), and an observation and maintenance door (16) is arranged at the observation window (15) for shielding and protecting the observation window (15).

9. A vertical calciner according to claim 1, wherein A cold air mechanism (7) is arranged below the kiln body (1), the rake arm assembly (4) comprises a rake arm (41) and a rake tooth (42), the rake arm (41) is connected to the main shaft (2), the rake tooth (42) is arranged below the rake arm (41), the main shaft (2) and the rake arm (41) are hollow structures, and the internal hollow structures of the main shaft (2) and the rake arm (41) are communicated, the cold air mechanism (7) is communicated with the internal hollow structure of the main shaft (2), and the cold air mechanism (7) is used for blowing cold air into the internal hollow structure of the main shaft (2) and the rake arm (41).

10. A vertical calciner kiln as claimed in claim 1, wherein, The driving mechanism (8) is arranged below the kiln body (1), the driving mechanism (8) is connected with the bottom end of the main shaft (2) which extends out of the bottom plate of the kiln body (1), and the driving mechanism (8) is used for driving the main shaft (2) to rotate.

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