High temperature alumina calcining equipment

Abstract

The present invention belongs to the field of alumina industrial production equipment, and relates to a high-temperature alumina calcining equipment, including a calcining furnace, the calcining furnace including a horizontal furnace body, a charging port is provided on the top of the horizontal furnace body, a furnace port cover is provided at the charging port, a smoke outlet is provided at the upper part of one end of the horizontal furnace body, a burner is installed at the other end, a temperature sensor is provided on one side of the horizontal furnace body, and the burner and the temperature sensor are both connected to the control system; the smoke outlet is connected to the air inlet end of the high-temperature hot air circulation system through a hot air duct, and the air outlet end of the high-temperature hot air circulation system is connected to the burner through the circulating air inlet duct; a rolling ring is provided at each end of the outer periphery of the horizontal furnace body, the rolling ring cooperates with the supporting system below, one side of the rolling ring is fixedly connected with a large gear ring, the large gear ring is set on the outer periphery of the horizontal furnace body, and the large gear ring is meshed with a small gear ring of the transmission system for transmission; a plurality of sampling ports are provided on one side of the horizontal furnace body. The present invention has large nominal capacity, high production efficiency, high product qualification rate, and good economic benefits.

Description

Technical Field

[0001] The invention relates to high-temperature alumina calcining equipment and belongs to the field of alumina industrial production equipment. Background Art

[0002] High temperature calcined α alumina powder and fine powder are made of alumina powder and aluminum hydroxide powder. They are characterized by high purity, high whiteness, true specific gravity, good thermal stability, uniform particle size distribution and good fluidity. High temperature calcined α alumina powder is the most stable state among the eight isomers of alumina. It has excellent mechanical properties, high temperature properties and insulation properties. It is widely used in ceramics, electric porcelain, refractory materials, spark plugs, brake pads, high aluminum products, advanced insulation parts, high purity refractory fibers, high-grade castables, grinding and polishing, artificial stone, etc. With the development of industrial technology, the application field of high temperature alumina is becoming wider and wider, and its usage is also increasing, and the prospects are very optimistic.

[0003] At present, there are several main ways to produce alumina:

[0004] (1) The high-temperature alumina products are continuously processed and fired in a small downdraft kiln. The downdraft kiln has the following disadvantages: low production capacity of a single kiln, low thermal efficiency, the flame is discharged through the flue and chimney after descending from the kiln top, and the discharge temperature is very high. In addition, the alumina is placed in the container and cannot be stirred during the calcination process, and it takes a long time to burn through. In addition, the production process is intermittent, and it is difficult to utilize the waste heat. The heat loss accumulated in the kiln body itself is also very large, resulting in energy waste; the cost of calcined products increases; the raw materials are filled into the saggers and the saggers are moved and stacked on the kiln car; the finished products in the saggers are unloaded and discharged from the kiln car by manual operation, and the labor intensity of the operators is high; the environmental conditions are poor and the cost is relatively high;

[0005] (2) It is made by high-temperature processing in a tunnel kiln. The raw material low-sodium alumina powder is placed in a sagger. The calcination temperature is above 1450°C and the temperature is kept for more than 12 hours. Special additives are added to control the sodium oxide content in the high-temperature alumina product through the high temperature effect and the sodium removal effect of the additives. The heat loss accumulated in the kiln body itself is also very large, resulting in a waste of energy. In addition, the alumina cannot be stirred in the container during the calcination process, and it takes a long time to burn through. The sintering process cannot be controlled. Since the tunnel kiln is equivalent to an extension of the downdraft kiln, the calcination time is longer, the output is relatively high, and the heat energy loss is relatively large; the environmental conditions are poor and the cost is relatively high. The advantage of the tunnel kiln is that the temperature in the kiln is stable. The raw materials and finished products also need to be manually loaded and unloaded, the operation is labor-intensive, and the output per unit is low;

[0006] (3) The rotary kiln replaces the high-cost tunnel kiln and downdraft kiln. According to the process requirements, the calcination temperature of high-temperature alumina is 1450 0 C-1500 0C, and there must be sufficient insulation time at high temperature to facilitate the requirement of crystal transformation. It can meet the different requirements of users and produce high-temperature alumina products of various specifications and varieties. Compared with the previous kiln types, it is a technological advancement. Alumina is heated and roasted during the movement process through physical and chemical changes. During this roasting process, alumina is always moving. It is necessary to manually and effectively control the various process parameters of the rotary kiln to produce qualified high-temperature alumina, which requires a high technical level of the operator; the firing zone is short from the kiln head, the kiln head temperature is high, the flame is short and rapid, causing damage to the refractory lining, and there is a large gap in the energy-saving effect of the system; the ventilation resistance in the kiln increases during operation or the secondary air is artificially reduced, which will cause the exhaust fan inlet temperature to be high, the casing and impeller will be worn and deformed, resulting in oscillation, and there are safety hazards; the material residence time in the kiln is not accurately controlled, which affects the crystal transformation; the calcination time and temperature of alumina in the kiln are not well controlled, which can easily make the product unqualified. Summary of the invention

[0007] The technical problem to be solved by the present invention is: to overcome the shortcomings of the prior art and propose a high-temperature alumina calcining equipment, the calcining furnace of the high-temperature alumina calcining equipment is a closed container and can rotate back and forth within a certain angle, the required heating conversion temperature and heating time of the product material can be controlled, the heating is uniform and can be formed into a certain particle size, and the nominal capacity can be increased according to the production capacity requirements. The equipment has good sealing and less heat dissipation loss, the product consumes less energy, and the heating effect is good; the production operation environment is improved; the equipment has a high degree of mechanization and automation, flexible operation, no need for manual unloading, low labor intensity, high production efficiency, high product qualification rate, and good economic benefits.

[0008] The high-temperature alumina calcining equipment described in the present invention includes a calcining furnace, a supporting system and a transmission system. The calcining furnace includes a horizontal furnace body. A loading port is provided on the top of the horizontal furnace body, and a furnace port cover is provided at the loading port. A smoke outlet is provided on the upper part of one end of the horizontal furnace body, and a burner is installed at the other end. A temperature sensor is provided on one side of the horizontal furnace body, and the burner and the temperature sensor are both connected to the control system; the smoke outlet is connected to the air inlet end of the high-temperature hot air circulation system through a hot air duct, and the air outlet end of the high-temperature hot air circulation system is connected to the burner through the circulating air inlet duct; a rolling ring is provided at each of the two ends of the outer periphery of the horizontal furnace body, and the rolling ring cooperates with the supporting system below, and one side of the rolling ring is fixedly connected to a large gear ring, which is mounted on the outer periphery of the horizontal furnace body, and the large gear ring is meshed with a small gear ring of the transmission system for transmission; a plurality of sampling ports are provided on one side of the horizontal furnace body.

[0009] There are multiple temperature sensors installed in various places of the horizontal furnace body, which is convenient for accurately obtaining temperature information in various places of the horizontal furnace body, making corresponding adjustments in time, and ensuring the quality of processed products. The top surface of the furnace cover is connected to the piston rod of the hydraulic cylinder, and the hydraulic cylinder controls the opening or closing of the furnace cover. During the working process, the small gear ring and the large gear ring of the transmission system are meshed and driven to rotate the horizontal furnace body to a certain angle, and then the furnace cover is opened, and the external feeding screw, air chute or warehouse pump is used to add materials. When the material is sufficient, the furnace cover is closed, and then the horizontal furnace body is driven by the transmission system to start rotating. The alumina in the horizontal furnace body rotates, and then the burner is ignited and heated. The temperature sensor monitors the temperature in the horizontal furnace body at all times, and then transmits the signal to the control system. The control system controls the maximum temperature and calcination time through the combustion and air intake of the burner; and samples are taken from the sampling port at regular intervals as needed to test the product quality and make adjustments in time, which is conducive to better control of product quality. When the test product is qualified, the fire is turned off for cooling or high-temperature unloading. When unloading, the horizontal furnace body is then rotated 180°, the smoke outlet is rotated to face directly downward, and then the horizontal furnace body is swung left and right at a small angle to make the discharge more thorough; then the horizontal furnace body is rotated 180° again to the initial state to continue to complete the next production process. The large gear ring contacts the horizontal furnace body through the rolling ring, which on the one hand prevents the horizontal furnace body from having a thermal effect on the transmission system and affecting the service life of the transmission system, ensures that the large gear ring and the small gear ring can mesh accurately, and on the other hand avoids unnecessary heat loss.

[0010] Preferably, the high-temperature hot air circulation system includes a high-temperature dust collector and a high-temperature fan, the hot air duct outlet is connected to the high-temperature dust collector inlet, the high-temperature dust collector outlet is connected to the high-temperature fan inlet through the outlet duct, and the high-temperature fan outlet is connected to the burner through the circulating air intake duct. The high-temperature gas discharged from the horizontal furnace body passes through the high-temperature dust collector for dust removal and purification, and then enters the horizontal furnace body again through the high-temperature fan and the burner, realizing the hot air circulation into the furnace, the heat can be fully utilized, energy is saved, and it is conducive to controlling the horizontal furnace body to maintain a constant temperature, which is conducive to improving the qualified rate of products.

[0011] Preferably, the supporting system includes two groups of side supporting rollers and one group of bottom supporting rollers, the bottom supporting rollers are arranged directly below the rolling ring, a group of side supporting rollers are arranged on both sides of the bottom supporting rollers, one group of side supporting rollers includes two side supporting rollers, the side supporting rollers and the bottom supporting rollers are respectively in rolling cooperation with the rolling ring, and the side supporting rollers and the bottom supporting rollers are respectively fixed to the base through supporting seats. The side supporting rollers and the bottom supporting rollers simultaneously support and assist the rotation of the horizontal furnace body, and the rolling cooperation makes the horizontal furnace body subject to less resistance, so that the horizontal furnace body can smoothly complete the left and right rotation.

[0012] Preferably, the transmission system comprises a main motor, a main gearbox, a slow-motion motor and a slow-motion gearbox, the driving shaft of the main motor is connected to one end of the input shaft of the main gearbox through the main motor coupling, the output shaft of the main gearbox is connected to the shaft of the small gear ring through the hydraulic brake and the low-speed coupling; the slow-motion motor is connected to the input shaft of the slow-motion gearbox through the slow-motion coupling and the slow-motion brake, and the output shaft of the slow-motion gearbox is connected to the other end of the input shaft of the main gearbox through the fork coupling. The main motor and the slow-motion motor work together to make the calcining furnace flip normally according to the speed required by the process operation, and can implement stepless speed regulation within a certain speed change range as needed to achieve rotation, slow motion and flipping. When rotating greatly, a high-power main motor is selected for fast movement, and when fine-tuning such as discharging, a low-power slow-motion motor is selected for slow movement, and the setting of the slow-motion brake can control the horizontal furnace body to stagnate at any angle, which is convenient for sampling or adding additives.

[0013] Preferably, the center line of the burner is arranged at an angle with the center axis of the horizontal furnace body, and the angle range is 7°-25°, so that the combustion flame intersects with the melt surface in the middle of the furnace as much as possible, which can not only ensure the full combustion of heavy oil or gas, but also facilitate heat absorption of the material.

[0014] Preferably, a discharge fine adjustment unit is additionally provided under the horizontal furnace body corresponding to the smoke outlet. The discharge fine adjustment unit can select a cooler or a reheater according to different products. When the discharge is rotated 180°, the smoke outlet corresponds to the cooler or the reheater. After the product falls into the cooler or the reheater, the product is reprocessed.

[0015] Preferably, an air collecting hood is added at the smoke outlet, and the air collecting hood includes two annular support ring side plates arranged around the outer wall of the horizontal furnace body, the outer edges of the two annular support ring side plates are connected by an inverted cone cover body, the two annular support ring side plates, the inverted cone cover body and the outer wall of the horizontal furnace body together constitute a smoke collecting area, the inner diameter clearance of the outer wall of the horizontal furnace body and the two annular support ring side plates are matched, and the part where the outer wall of the horizontal furnace body and the inner diameter of the annular support ring side plates match is provided with a flexible seal; the top and bottom ends of the inverted cone cover body are respectively provided with a through hole, the hot air duct is connected to the through hole at the top of the inverted cone cover body, and the hot air duct is flexibly connected to the inverted cone cover body. The bottom ends of the two annular support ring side plates and the inverted cone cover body are fixedly connected to the equipment foundation building, and the smoke collecting area is in a negative pressure state, which is convenient for collecting the gas in the furnace body, and the high-temperature hot air circulation system directly sucks away the dusty smoke; the horizontal furnace body can rotate in the closed space formed by it and the annular support ring side plates.

[0016] Preferably, a cooling water pipe is arranged inside the furnace cover, and the cooling water pipe is connected to a cooling water tank arranged outside the horizontal furnace body. The setting of the cooling water pipe can protect the furnace cover and prevent the furnace cover from deforming and causing leakage under high temperature conditions. During use, the cooling water tank and the cooling water pipe can realize water circulation.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The invention has a reasonable structural design, a closed container of the calcining furnace and can rotate back and forth within a certain angle, the required heating conversion temperature and heating time of the product material can be controlled, the heating is uniform and can be formed into a certain particle size, and the nominal capacity can be increased according to the production capacity requirements. The equipment has good sealing performance and less heat dissipation loss, the product consumes less energy, and the heating effect is good; the production operation environment is improved; the equipment has a high degree of mechanization and automation, flexible operation, no need for manual unloading, low labor intensity, high production efficiency, high product qualification rate, and good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 , schematic diagram of the structure of high temperature alumina calcining equipment;

[0020] Figure 2 , top view of calcining furnace;

[0021] Figure 3 , left view of calcining furnace;

[0022] Figure 4 , schematic diagram of transmission system structure.

[0023] In the figure: 1. Horizontal furnace body; 2. Air collecting hood; 3. Hot air duct; 4. Charging port; 5. Furnace cover; 6. Burner; 7. Circulating air intake duct; 8. High temperature dust collector; 9. Air outlet duct; 10. High temperature fan; 11. Main motor; 12. Main gear box; 13. Small gear ring; 14. Base; 15. Temperature sensor; 16. Discharge fine adjustment unit; 17. Inverted cone hood; 18. Discharge Cigarette drop port; 19. Rolling ring; 20. Sampling port; 21. Large gear ring; 22. Hydraulic cylinder; 23. Bottom supporting roller; 24. Support seat; 25. Side supporting roller; 26. Main motor coupling; 27. Shift fork coupling; 28. Slow-motion gear box; 29. ​​Slow-motion coupling; 30. Slow-motion brake; 31. Slow-motion motor; 32. Low-speed coupling; 33. Hydraulic brake; 34. Annular support ring side plate. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings:

[0025] like Figure 1-Figure 4The high-temperature alumina calcining equipment described in the present invention includes a calcining furnace, a supporting system and a transmission system. The calcining furnace includes a horizontal furnace body 1. A charging port 4 is provided on the top of the horizontal furnace body 1. A furnace cover 5 is provided at the charging port 4. A smoke outlet 18 is provided on the upper part of one end of the horizontal furnace body 1, and a burner 6 is installed on the other end. A temperature sensor 15 is provided on one side of the horizontal furnace body 1, and the burner 6 and the temperature sensor 15 are both connected to the control system; the smoke outlet 18 is connected to the air inlet end of the high-temperature hot air circulation system through the hot air duct 3, and the air outlet end of the high-temperature hot air circulation system is connected to the burner 6 through the circulating air inlet duct 7; a rolling ring 19 is provided at each of the two ends of the outer periphery of the horizontal furnace body 1, and the rolling ring 19 cooperates with the supporting system below, and one side of the rolling ring 19 is fixedly connected to a large gear ring 21, and the large gear ring 21 is mounted on the outer periphery of the horizontal furnace body 1, and the large gear ring 21 is meshed with a small gear ring 13 of the transmission system for transmission; a plurality of sampling ports 20 are provided on one side of the horizontal furnace body 1.

[0026] In this embodiment:

[0027] The high-temperature hot air circulation system includes a high-temperature dust collector 8 and a high-temperature fan 10. The air outlet of the hot air duct 3 is connected to the air inlet of the high-temperature dust collector 8. The air outlet of the high-temperature dust collector 8 is connected to the air inlet of the high-temperature fan 10 through the air outlet duct 9. The air outlet of the high-temperature fan 10 is connected to the burner 6 through the circulating air intake duct 7. The high-temperature gas discharged from the horizontal furnace body 1 passes through the high-temperature dust collector 8 for dust removal and purification, and then enters the horizontal furnace body 1 again through the high-temperature fan 10 and the burner 6, so that the hot air circulates into the furnace, the heat can be fully utilized, energy is saved, and it is conducive to controlling the horizontal furnace body 1 to maintain a constant temperature, which is conducive to improving the qualified rate of products.

[0028] The supporting system includes two sets of side supporting rollers and one set of bottom supporting rollers 22. The bottom supporting rollers 22 are arranged directly below the rolling ring 19. A set of side supporting rollers is arranged on both sides of the bottom supporting rollers 22. One set of side supporting rollers includes two side supporting rollers 25. The side supporting rollers 25 and the bottom supporting rollers 22 are respectively rollingly matched with the rolling ring 19, and the side supporting rollers 25 and the bottom supporting rollers 22 are respectively fixed to the base 14 through the support seats 24. The side supporting rollers 25 and the bottom supporting rollers 22 simultaneously support and assist the rotation of the horizontal furnace body 1. The rolling match makes the horizontal furnace body 1 less subject to resistance, so that the horizontal furnace body 1 can smoothly complete the left and right rotation.

[0029] The transmission system includes a main motor 11, a main gearbox 12, a slow-motion motor 31 and a slow-motion gearbox 28. The driving shaft of the main motor 11 is connected to one end of the input shaft of the main gearbox 12 through the main motor coupling 26, and the output shaft of the main gearbox 12 is connected to the shaft of the small gear ring 13 through the hydraulic brake 33 and the low-speed coupling 32; the slow-motion motor 31 is connected to the input shaft of the slow-motion gearbox 28 through the slow-motion coupling 29 and the slow-motion brake 30, and the output shaft of the slow-motion gearbox 28 is connected to the other end of the input shaft of the main gearbox 12 through the fork coupling 27. The main motor 11 and the slow-motion motor 31 work together to make the calcining furnace flip normally at the speed required by the process operation, and can implement stepless speed regulation within a certain speed change range as needed to achieve rotation, slow motion and flipping. When rotating greatly, a high-power main motor 11 is selected for fast movement. When fine-tuning such as discharging is required, a low-power slow-motion motor 31 is selected for slow movement. The setting of the slow-motion brake 30 can control the horizontal furnace body to stop at any angle, which is convenient for sampling or adding additives.

[0030] The center line of the burner 6 is set at an angle with the center axis of the horizontal furnace body 1, and the angle range is 7°-25°, so that the combustion flame intersects with the melt surface in the middle of the furnace as much as possible, which can ensure the full combustion of heavy oil or gas and is conducive to heat absorption of the material.

[0031] A discharge fine adjustment unit 16 is additionally provided under the horizontal furnace body 1 corresponding to the smoke discharge port 18. The discharge fine adjustment unit 16 can select a cooler or a reheater according to different products. After the discharge is rotated 180°, the smoke discharge port 18 corresponds to the cooler or the reheater. After the product falls into the cooler or the reheater, the product is reprocessed.

[0032] An air collecting hood 2 is additionally provided at the smoke outlet 18, and the air collecting hood 2 includes two annular support ring side plates 34 arranged around the outer wall of the horizontal furnace body 1, and the outer edges of the two annular support ring side plates 34 are connected by an inverted cone hood body 17, and the two annular support ring side plates 34, the inverted cone hood body 17 and the outer wall of the horizontal furnace body 1 together constitute a smoke collecting area, and the outer wall of the horizontal furnace body 1 and the inner diameter clearance of the two annular support ring side plates 34 are matched, and the part where the outer wall of the horizontal furnace body 1 and the inner diameter of the annular support ring side plates 34 match is provided with a flexible sealing member; a through hole is respectively provided at the top and bottom ends of the inverted cone hood body 17, and the hot air duct 3 is connected to the through hole at the top of the inverted cone hood body 17, and the hot air duct 3 is flexibly connected to the inverted cone hood body 17. The bottom ends of the two annular support ring side plates 34 and the inverted cone cover body 17 are fixedly connected to the equipment foundation building. The smoke collection area is in a negative pressure state, which is convenient for collecting the gas in the furnace body, and the high-temperature hot air circulation system directly sucks away the dust-containing smoke; the horizontal furnace body 1 can rotate in the enclosed space formed by it and the annular support ring side plates 34.

[0033] Cooling water pipes are arranged around the charging port 4 and inside the furnace cover 5. The cooling water pipes are connected to a cooling water tank outside the horizontal furnace body 1. The arrangement of the cooling water pipes can protect the furnace cover 5 and the charging port 4 from being damaged by high temperature. During use, the cooling water tank and the cooling water pipes can realize water circulation.

[0034] There are multiple temperature sensors 15, which are arranged at various locations of the horizontal furnace 1, so as to accurately obtain the temperature information at various locations of the horizontal furnace 1, make corresponding adjustments in time, and ensure the quality of the processed products. The top surface of the furnace cover 5 is connected to the piston rod of the hydraulic cylinder 22, and the hydraulic cylinder 22 controls the opening or closing of the furnace cover 5. During operation, the small gear ring 13 of the transmission system is meshed with the large gear ring 21 to rotate the horizontal furnace body 1 to a certain angle, and then the furnace cover 5 is opened, and the external feeding screw, air chute or silo pump is used to add materials. When the material is sufficient, the furnace cover 5 is closed by the hydraulic cylinder 22, and then the horizontal furnace body 1 is driven by the main motor 11 to start rotating. The alumina in the horizontal furnace body 1 rotates, and then the burner 6 is ignited for heating. The temperature sensor 15 monitors the temperature in the horizontal furnace body 1 at all times, and then transmits the signal to the control system. The control system controls the maximum temperature and calcination time through the combustion and air intake of the burner 6; and samples are taken from the sampling port 20 at regular intervals as needed to test the product quality and make adjustments in time, which is conducive to better control of product quality. When the tested product is qualified, the fire is turned off for cooling or high-temperature unloading. When unloading, the horizontal furnace body 1 is then rotated 180°. The smoke outlet 18 is rotated to face directly downward, and then the horizontal furnace body 1 is swung left and right at a small angle to make the discharge more thorough; then the horizontal furnace body 1 is rotated 180° again to the initial state to continue the next production process. The large gear ring 21 contacts the horizontal furnace body 1 through the rolling ring 19, which, on the one hand, prevents the horizontal furnace body 1 from having a thermal effect on the transmission system and affects the service life of the transmission system, ensures that the large gear ring 21 and the small gear ring 13 can mesh accurately, and on the other hand, avoids unnecessary heat loss.

Claims

1. A high temperature alumina calcining equipment, characterized in that: The calcining furnace comprises a calcining furnace, a supporting system and a transmission system. The calcining furnace comprises a horizontal furnace body (1). A charging port (4) is provided at the top of the horizontal furnace body (1). A furnace port cover (5) is provided at the charging port (4). A smoke outlet (18) is provided at the upper part of one end of the horizontal furnace body (1). A burner (6) is installed at the other end. A temperature sensor (15) is provided at one side of the horizontal furnace body (1). Both the burner (6) and the temperature sensor (15) are connected to a control system. The smoke outlet (18) is connected to a high temperature control system through a hot air duct (3). The air inlet end of the hot air circulation system and the air outlet end of the high-temperature hot air circulation system are connected to the burner (6) through the circulating air inlet pipe (7); a rolling ring (19) is provided at each end of the outer periphery of the horizontal furnace body (1), the rolling ring (19) cooperates with the supporting system below, one side of the rolling ring (19) is fixedly connected to a large gear ring (21), the large gear ring (21) is sleeved on the outer periphery of the horizontal furnace body (1), and the large gear ring (21) is meshed with a small gear ring (13) of the transmission system for transmission; a plurality of sampling ports (20) are provided on one side of the horizontal furnace body (1).

2. The high temperature alumina calcining equipment according to claim 1, characterized in that: The high-temperature hot air circulation system comprises a high-temperature dust collector (8) and a high-temperature fan (10); the air outlet of the hot air duct (3) is connected to the air inlet of the high-temperature dust collector (8); the air outlet of the high-temperature dust collector (8) is connected to the air inlet of the high-temperature fan (10) through the air outlet duct (9); and the air outlet of the high-temperature fan (10) is connected to the burner (6) through the circulating air inlet duct (7).

3. The high temperature alumina calcining equipment according to claim 1, characterized in that: The supporting system comprises two groups of side supporting rollers and one group of bottom supporting rollers (23), wherein the bottom supporting rollers (23) are arranged directly below the rolling ring (19), and a group of side supporting rollers is arranged on both sides of the bottom supporting rollers (23), wherein one group of side supporting rollers comprises two side supporting rollers (25), wherein the side supporting rollers (25) and the bottom supporting rollers (23) respectively cooperate with the rolling ring (19) in rolling manner, and the side supporting rollers (25) and the bottom supporting rollers (23) are respectively fixed to the base (14) through support seats (24).

4. The high temperature alumina calcining equipment according to claim 1, characterized in that: The transmission system comprises a main motor (11), a main gear box (12), a slow-motion motor (31) and a slow-motion gear box (28); the driving shaft of the main motor (11) is connected to one end of the input shaft of the main gear box (12) through a main motor coupling (26); the output shaft of the main gear box (12) is connected to the shaft of the small gear ring (13) through a hydraulic brake (33) and a low-speed coupling (32); the slow-motion motor (31) is connected to the input shaft of the slow-motion gear box (28) through a slow-motion coupling (29) and a slow-motion brake (30); the output shaft of the slow-motion gear box (28) is connected to the other end of the input shaft of the main gear box (12) through a shift fork coupling (27).

5. The high temperature alumina calcining equipment according to claim 1, characterized in that: The center line of the burner (6) is arranged to form an angle with the center axis of the horizontal furnace body (1), and the angle range is 7°-25°.

6. The high temperature alumina calcining equipment according to claim 1, characterized in that: A material discharge fine adjustment unit (16) is additionally provided below the horizontal furnace body (1) corresponding to the smoke discharge and material discharge opening (18).

7. The high temperature alumina calcining equipment according to claim 1, characterized in that: An air collecting hood (2) is additionally provided at the smoke outlet (18), and the air collecting hood (2) comprises two annular support ring side plates (34) arranged around the outer wall of the horizontal furnace body (1), the outer edges of the two annular support ring side plates (34) are connected via an inverted cone hood (17), the two annular support ring side plates (34), the inverted cone hood (17) and the outer wall of the horizontal furnace body (1) together form a smoke collecting area, the outer wall of the horizontal furnace body (1) and the inner diameter clearance of the two annular support ring side plates (34) are matched, and the part where the outer wall of the horizontal furnace body (1) and the inner diameter of the annular support ring side plates (34) match is provided with a flexible sealing member; a through hole is respectively provided at the top and bottom of the inverted cone hood (17), the hot air duct (3) is connected to the through hole at the top of the inverted cone hood (17), and the hot air duct (3) is flexibly connected to the inverted cone hood (17).

8. The high temperature alumina calcining equipment according to claim 1, characterized in that: A cooling water pipe is arranged inside the furnace cover (5), and the cooling water pipe is connected to a cooling water bin arranged outside the horizontal furnace body (1).

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