CN212253605U

CN212253605U - High-temperature alumina calcining equipment

Info

Publication number: CN212253605U
Application number: CN202021650973.7U
Authority: CN
Inventors: 王蘋; 武曌杰
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-08-10
Filing date: 2020-08-10
Publication date: 2020-12-29
Anticipated expiration: 2030-08-10

Abstract

The utility model belongs to the field of alumina industrial production equipment, and relates to high-temperature alumina calcining equipment, which comprises a calcining furnace, wherein the calcining furnace comprises a horizontal furnace body, the top of the horizontal furnace body is provided with a charging hole, the charging hole is provided with a furnace cover, the upper part of one end of the horizontal furnace body is provided with a smoke discharging and blanking hole, the other end of the horizontal furnace body is provided with a burner, one side of the horizontal furnace body is provided with a temperature sensor, and the burner and the temperature sensor are both connected with a; the smoke outlet blanking port is connected with the air inlet end of the high-temperature hot air circulating system through a hot air pipeline, and the air outlet end of the high-temperature hot air circulating system is communicated with the combustor through a circulating air inlet pipeline; two ends of the periphery of the horizontal furnace body are respectively provided with a rolling ring, the rolling rings are matched with a bearing system below the rolling rings, one side of each rolling ring is fixedly connected with a large gear ring, the large gear ring is sleeved on the periphery of the horizontal furnace body, and the large gear ring is in meshing transmission with a small gear ring of a transmission system; one side of the horizontal furnace body is provided with a plurality of sampling ports. The utility model discloses the nominal ability is big, and production efficiency is high, and the product percent of pass is high, and economic benefits is good.

Description

High-temperature alumina calcining equipment

Technical Field

The utility model relates to a high-temperature alumina calcining device, which belongs to the field of alumina industrial production equipment.

Background

The high-temperature calcined alpha alumina powder raw powder and micro powder are prepared from alumina powder and aluminum hydroxide powder, and are characterized in that: the alumina powder has the characteristics of high purity, high whiteness, high true specific gravity, good thermal stability, uniform particle size distribution, good fluidity and the like, has excellent mechanical property, high temperature property and insulating property when the most stable state of eight isomorphs of alpha alumina powder and alumina is calcined at high temperature, and is widely applied to ceramics, electric ceramics, refractory materials, spark plugs, brake pads, high-aluminum products, high-grade insulating parts, high-purity refractory fibers, high-grade castable, grinding and polishing, artificial stones and the like. With the development of industrial technology, the application field of high-temperature alumina is wider and wider, the dosage of the high-temperature alumina is larger and larger, and the prospect is very optimistic.

At present, the following methods are mainly used for producing the alumina,

(1) the high-temperature alumina products fired by the continuous processing of a small-sized down-draft kiln have the following defects: the single kiln has low production capacity and low thermal efficiency, the flame is discharged from a flue and a chimney after descending from the top of the kiln, the discharge temperature is very high, alumina is arranged in a container in the calcining process and cannot be stirred, and the alumina can be burnt through for a long time! In addition, the production process is intermittent, and the waste heat is difficult to utilize! The heat loss accumulated by the kiln body is large, so that the energy is wasted; the cost of the calcined product rises; the saggars are filled with raw materials, and the saggars are moved and stacked on a kiln car; the finished products in the saggar are unloaded on a kiln car and discharged from the kiln, manual operation is needed, and the labor intensity of operators is high; the environmental condition is poor, and the cost is higher;

(2) the high-temperature alumina is processed by adopting a tunnel kiln at high temperature, the sagger is used for containing the low-sodium alumina powder as the raw material, the calcining temperature is over 1450 ℃, the heat preservation is carried out for over 12 hours, the special additive is added, and the sodium oxide content in the high-temperature alumina finished product is controlled through the high-temperature action and the sodium discharge action of the additive. The heat loss accumulated by the kiln body is large, so that the energy waste is caused, the alumina cannot be stirred when being arranged in the container in the calcining process, the alumina can be burnt out for a long time, the sintering process cannot be controlled, and the tunnel kiln is equivalent to the down-draft kiln, so that the calcining time is long, the yield is high, and the heat energy loss is large; the environmental condition is poor, and the cost is higher. The tunnel kiln has the advantages that the temperature in the kiln is stable, raw materials and finished products also need to be manually loaded and unloaded, the operation labor intensity is high, and the output of a single machine is low;

(3) the rotary kiln replaces a tunnel kiln and a down draft kiln with high cost, the calcination temperature of high-temperature alumina is 1450-1500 ℃ according to the process requirements, and sufficient heat preservation time is needed to be provided in a high-temperature state to be beneficial to the requirement of crystal form conversion, so that different requirements of users can be met, high-temperature alumina products with various specifications and varieties are produced, compared with the previous kiln types, the high-temperature alumina products are technically improved, the alumina is heated in the moving process and is calcined through physical and chemical changes, the calcination process is that the alumina always moves, various process parameters of the rotary kiln need to be effectively controlled manually, the qualified high-temperature alumina can be produced, and the technical level requirement on operators is higher; the distance between the burning zone and the kiln head is short, the temperature of the kiln head is high, the fire-resistant lining is damaged due to short and quick burning of flame, and the energy-saving effect of the system is greatly different; the ventilation resistance in the kiln is increased or secondary air is artificially reduced in the operation process, so that the inlet temperature of the exhaust fan is high, the shell and the impeller are abraded and deformed to cause oscillation, and potential safety hazards exist; the residence time of the materials in the kiln is not accurately controlled, and the crystal form conversion is influenced; the calcination time and temperature of the alumina in the kiln are not well controlled, and the product is easy to be unqualified.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: the defects of the prior art are overcome, and the high-temperature alumina calcining equipment is provided, wherein a container closed by a calcining furnace of the high-temperature alumina calcining equipment can rotate back and forth within a certain angle, the required heating conversion temperature and heating time of product materials can be controlled, the heating is uniform and can form a certain granularity, the nominal capacity can be increased according to the capacity requirement, the equipment has good sealing property, less heat dissipation loss, less energy consumption of products and good heating effect; the production operation environment is improved; the equipment has the advantages of high degree of mechanical automation, flexible operation, no need of manual unloading, low labor intensity, high production efficiency, high product qualification rate and good economic benefit.

The utility model discloses a high temperature alumina calcining device, including calcining furnace, bearing system and transmission system, calcining furnace includes horizontal furnace body, horizontal furnace body top is equipped with the charging hole, the charging hole department is equipped with furnace mouth lid, horizontal furnace body one end upper portion is equipped with out the cigarette blanking mouth, the other end is installed the combustor, horizontal furnace body one side is equipped with temperature sensor, combustor and temperature sensor all connect control system; the smoke outlet blanking port is connected with the air inlet end of the high-temperature hot air circulating system through a hot air pipeline, and the air outlet end of the high-temperature hot air circulating system is communicated with the combustor through a circulating air inlet pipeline; two ends of the periphery of the horizontal furnace body are respectively provided with a rolling ring, the rolling rings are matched with a bearing system below the rolling rings, one side of each rolling ring is fixedly connected with a large gear ring, the large gear ring is sleeved on the periphery of the horizontal furnace body, and the large gear ring is in meshing transmission with a small gear ring of a transmission system; one side of the horizontal furnace body is provided with a plurality of sampling ports.

The temperature sensors are arranged at all positions of the horizontal furnace body, so that temperature information of all positions of the horizontal furnace body can be accurately acquired, corresponding adjustment can be timely made, and the quality of processed products can be guaranteed. The top surface of the furnace cover is connected with a piston rod of a hydraulic cylinder, and the hydraulic cylinder controls the opening or closing of the furnace cover. In the working process, the small gear ring and the large gear ring of the transmission system are in meshed transmission, the horizontal furnace body is rotated by a certain angle, then the furnace opening cover is opened, an external feeding screw, an air chute or a bin pump are used for feeding materials, after the materials are sufficient, the furnace opening cover is closed, then the horizontal furnace body is driven by the transmission system to start rotating, alumina in the horizontal furnace body rotates along with the rotation, then the burner is ignited and heated, the temperature sensor monitors the temperature in the horizontal furnace body constantly, then a signal is transmitted to the control system, and the control system controls the highest temperature and the calcination time through the combustion and air inlet conditions of the burner; the horizontal furnace body is rotated by 180 degrees, the smoke discharging and blanking port is rotated to face the right lower part, and then the horizontal furnace body is swung at a small angle from left to right, so that the discharging is more thorough; and then the horizontal furnace body is rotated by 180 degrees again to the initial state, and the next production process is continuously completed. The large gear ring is in contact with the horizontal furnace body through the rolling ring, so that on one hand, the horizontal furnace body is prevented from having a thermal effect on the transmission system, the service life of the transmission system is prevented from being influenced, the large gear ring and the small gear ring can be accurately meshed, and on the other hand, unnecessary heat loss is avoided.

Preferably, the high-temperature hot air circulating system comprises a high-temperature dust remover and a high-temperature fan, an air outlet of the hot air pipeline is communicated with an air inlet of the high-temperature dust remover, an air outlet of the high-temperature dust remover is communicated with an air inlet of the high-temperature fan through an air outlet pipeline, and an air outlet of the high-temperature fan is communicated with the combustor through a circulating air inlet pipeline. High-temperature gas discharged by the horizontal furnace body is subjected to dust removal and purification through the high-temperature dust remover and then enters the horizontal furnace body again through the high-temperature fan and the combustor, so that hot air circulation is realized, heat is fully utilized, energy is saved, constant temperature in the horizontal furnace body can be controlled, and the product yield can be improved.

Preferably, the bearing system include two sets of side bearing roller sets and a set of end bearing roller, end bearing roller sets up under the rolling circle, end bearing roller both sides respectively are equipped with a set of side bearing roller set, a set of side bearing roller set includes two side bearing rollers, side bearing roller and end bearing roller respectively with roll the circle and roll the cooperation to side bearing roller and end bearing roller are fixed through supporting seat and base respectively. The side bearing carrier rollers and the bottom bearing rollers simultaneously play roles in supporting and assisting the horizontal furnace body to rotate, and the horizontal furnace body is small in resistance force due to rolling fit, so that the horizontal furnace body can stably rotate left and right.

Preferably, the transmission system comprises a main motor, a main gear box, a slow-motion motor and a slow-motion gear box, wherein a driving shaft of the main motor is connected with one end of an input shaft of the main gear box through a coupling of the main motor, and an output shaft of the main gear box is connected with a shaft of the small gear ring through a hydraulic band-type brake and a low-speed coupling; the slow-motion motor is connected with an input shaft of the slow-motion gear box through a slow-motion coupler and a slow-motion contracting brake, and an output shaft of the slow-motion gear box is connected with the other end of the input shaft of the main gear box through a shifting fork coupler. The main motor and the slow-moving motor work in a matching way, so that the calcining furnace is normally turned at the rotating speed required by the process operation, and stepless speed regulation can be realized within a certain rotating speed variation range according to the requirement, and rotation, slow movement and turning are realized. When the horizontal furnace body rotates greatly, a high-power main motor is selected for rapid action, when fine adjustment is carried out, a low-power slow-motion motor is selected for slow action, and the arrangement of a slow-motion band-type brake can control the horizontal furnace body to be stopped at any angle, so that sampling or additive addition is facilitated.

Preferably, the central line of the burner and the central axis of the horizontal furnace body form an included angle, the included angle ranges from 7 degrees to 25 degrees, the burning flame is intersected with the melt surface in the middle of the hearth as much as possible, the full burning of heavy oil or fuel gas can be ensured, and the heat absorption of materials is facilitated.

Preferably, a fine discharging adjusting unit is additionally arranged below the horizontal furnace body corresponding to the smoke discharging and blanking port, the fine discharging adjusting unit can select a cooler or a reheater according to different products to be produced, after the discharging material rotates 180 degrees, the smoke discharging and blanking port corresponds to the cooler or the reheater, and the products are reprocessed after falling into the cooler or the reheater.

Preferably, a gas collecting hood is additionally arranged at the smoke outlet and blanking port and comprises 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 through an inverted cone-shaped hood body, the two annular support ring side plates, the inverted cone-shaped hood body and the outer wall of the horizontal furnace body jointly form a smoke collecting area, the outer wall of the horizontal furnace body is in clearance fit with the inner diameters of the two annular support ring side plates, and a flexible sealing element is arranged at the part of the outer wall of the horizontal furnace body, which is matched with the inner diameters of the annular support ring; the top end and the bottom end of the inverted cone cover body are respectively provided with a through hole, the hot air pipeline is connected with the through hole at the top end of the inverted cone cover body, and the hot air pipeline is flexibly connected with the inverted cone cover body. The bottom ends of the two annular support ring side plates and the inverted cone-shaped cover body are fixedly connected with the equipment foundation building, a smoke collection area is in a negative pressure state, gas in a furnace body can be conveniently collected, and the high-temperature hot air circulating system directly sucks away dust-containing smoke; the horizontal furnace body can rotate in a closed space formed by the horizontal furnace body and the side plate of the annular support ring.

Preferably, a cooling water pipe is arranged in the furnace mouth cover and connected with a cooling water bin arranged outside the horizontal furnace body, the cooling water pipe can protect the furnace mouth cover, the furnace mouth cover is prevented from being deformed under the high-temperature condition to cause leakage, and the cooling water bin and the cooling water pipe can realize water circulation in the use process.

Compared with the prior art, the utility model beneficial effect who has is:

the utility model has the advantages of reasonable structural design, the calcining furnace closed container can rotate back and forth in 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 in a certain granularity, the nominal capacity can be increased according to the capacity requirement, the equipment sealing performance is good, the heat dissipation loss is less, the energy consumption of the product is less, and the heating effect is good; the production operation environment is improved; the equipment has the advantages of high degree of mechanical automation, flexible operation, no need of manual unloading, low labor intensity, high production efficiency, high product qualification rate and good economic benefit.

Drawings

FIG. 1 is a schematic diagram of a high-temperature alumina calcining apparatus;

FIG. 2, plan view of the calciner;

FIG. 3, left side view of the calciner;

fig. 4, a schematic diagram of the transmission system structure.

In the figure: 1. a horizontal furnace body; 2. a gas-collecting hood; 3. a hot air duct; 4. a charging port; 5. a furnace door; 6. a burner; 7. a circulating air intake duct; 8. a high temperature dust remover; 9. an air outlet pipeline; 10. a high temperature fan; 11. a main motor; 12. a main gear box; 13. a small gear ring; 14. a base; 15. a temperature sensor; 16. a discharge fine adjustment unit; 17. an inverted cone-shaped cover body; 18. discharging a cigarette blanking port; 19. rolling a ring; 20. a sampling port; 21. a large gear ring; 22. a hydraulic cylinder; 23. a bottom bearing roller; 24. a supporting seat; 25. a side supporting roller; 26. a main motor coupling; 27. a shifting fork coupling; 28. a slow-motion gear box; 29. a slow motion coupling; 30. slowly moving the band-type brake; 31. a slow-motion motor; 32. a low speed coupling; 33. hydraulic internal contracting brake; 34. annular support ring curb plate.

Detailed Description

The invention will be further described with reference to the accompanying drawings:

as shown in fig. 1-4, the high-temperature alumina calcining apparatus of the present invention comprises a calcining furnace, a bearing system and a transmission system, wherein the calcining furnace comprises a horizontal furnace body 1, a charging hole 4 is arranged at the top of the horizontal furnace body 1, a furnace cover 5 is arranged at the charging hole 4, a smoke discharging and blanking hole 18 is arranged at the upper part of one end of the horizontal furnace body 1, a burner 6 is arranged at the other end of the horizontal furnace body, a temperature sensor 15 is arranged at one side of the horizontal furnace body 1, and both the burner 6 and the temperature sensor 15 are connected with the control; the smoke outlet blanking port 18 is connected with the air inlet end of the high-temperature hot air circulating system through the hot air pipeline 3, and the air outlet end of the high-temperature hot air circulating system is communicated with the combustor 6 through the circulating air inlet pipeline 7; two ends of the periphery of the horizontal furnace body 1 are respectively provided with a rolling ring 19, the rolling rings 19 are matched with a bearing system below, one side of each rolling ring 19 is fixedly connected with a large gear ring 21, the large gear ring 21 is sleeved on the periphery of the horizontal furnace body 1, and the large gear ring 21 is in meshing transmission with a small gear ring 13 of a transmission system; one side of the horizontal furnace body 1 is provided with a plurality of sampling ports 20.

In this embodiment:

the high-temperature hot air circulating system comprises a high-temperature dust remover 8 and a high-temperature fan 10, an air outlet of the hot air pipeline 3 is communicated with an air inlet of the high-temperature dust remover 8, an air outlet of the high-temperature dust remover 8 is communicated with an air inlet of the high-temperature fan 10 through an air outlet pipeline 9, and an air outlet of the high-temperature fan 10 is communicated with the combustor 6 through a circulating air inlet pipeline 7. High-temperature gas discharged by the horizontal furnace body 1 is subjected to dust removal and purification through the high-temperature dust remover 8, and then enters the horizontal furnace body 1 again through the high-temperature fan 10 and the combustor 6, so that hot air circulation is realized, heat is fully utilized, energy is saved, the constant temperature in the horizontal furnace body 1 is favorably controlled, and the product yield is favorably improved.

The bearing system includes two sets of side bearing roller 25 groups and a set of end bearing roller 22, and end bearing roller 22 sets up under rolling circle 19, and end bearing roller 22 both sides respectively are equipped with a set of side bearing roller 25 groups, and a set of side bearing roller 25 groups includes two side bearing rollers 25, and side bearing roller 25 and end bearing roller 22 roll the cooperation with rolling circle 19 respectively to side bearing roller 25 and end bearing roller 22 are fixed with base 14 through supporting seat 24 respectively. The side bearing rollers 25 and the bottom bearing rollers 22 simultaneously play roles of supporting and assisting the horizontal furnace body 1 to rotate, and the horizontal furnace body 1 is small in resistance force due to rolling fit, so that the horizontal furnace body 1 can stably complete left-right rotation.

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, wherein a driving shaft of the main motor 11 is connected with one end of an input shaft of the main gear box 12 through a main motor coupler 26, and an output shaft of the main gear box 12 is connected with a shaft of the small gear ring 13 through a hydraulic band-type brake 33 and a low-speed coupler 32; the slow-motion motor 31 is connected with an input shaft of the slow-motion gear box 28 through a slow-motion coupling 29 and a slow-motion band-type brake 30, and an output shaft of the slow-motion gear box 28 is connected with the other end of the input shaft of the main gear box 12 through a shifting fork coupling 27. The main motor 11 and the slow-moving motor 31 work cooperatively, so that the calcining furnace is normally turned at the rotating speed required by the process operation, and stepless speed regulation can be realized within a certain rotating speed variation range according to the requirement, and rotation, slow movement and turnover are realized. When the horizontal furnace body rotates greatly, the high-power main motor 11 is selected to act quickly, when fine adjustment is carried out, the low-power slow-motion motor 31 is selected to act slowly, and the arrangement of the slow-motion band-type brake 30 can control the horizontal furnace body to stop at any angle, so that sampling or additive addition is facilitated.

The central line of the burner 6 and the central axis of the horizontal furnace body 1 form an included angle, the included angle ranges from 7 degrees to 25 degrees, so that the burning flame intersects with the melt surface at the middle part of the hearth as much as possible, thereby not only ensuring the full burning of heavy oil or fuel gas, but also being beneficial to the heat absorption of materials.

A discharging fine adjustment unit 16 is additionally arranged below the horizontal furnace body 1 corresponding to the smoke discharging blanking port 18, the discharging fine adjustment unit 16 can select a cooler or a reheater according to different products to be produced, after the discharging material rotates 180 degrees, the smoke discharging blanking port 18 corresponds to the cooler or the reheater, and after the products fall into the cooler or the reheater, the products are reprocessed.

The gas collecting hood 2 is additionally arranged at the smoke discharging and blanking port 18, the gas 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 through an inverted cone-shaped hood body 17, the two annular support ring side plates 34, the inverted cone-shaped hood body 17 and the outer wall of the horizontal furnace body 1 jointly form a smoke collecting area, the outer wall of the horizontal furnace body 1 is in clearance fit with the inner diameters of the two annular support ring side plates 34, and a flexible sealing piece is arranged at the part of the outer wall of the horizontal furnace body 1, which is matched with the inner diameters; the top and the bottom of the inverted cone cover body 17 are respectively provided with a through hole, the hot air pipeline 3 is connected with the through hole at the top of the inverted cone cover body 17, and the hot air pipeline 3 is flexibly connected with the inverted cone cover body 17. The bottom ends of the two annular support ring side plates 34 and the inverted cone-shaped cover body 17 are fixedly connected with an equipment foundation building, a smoke collection area is in a negative pressure state, gas in a furnace body can be conveniently collected, and the high-temperature hot air circulating system directly sucks away dust-containing smoke; the horizontal furnace body 1 can rotate in the closed space formed by the horizontal furnace body and the annular support ring side plate 34.

Cooling water pipes are arranged around the charging hole 4 and in the furnace mouth cover 5, the cooling water pipes are connected with a cooling water bin arranged outside the horizontal furnace body 1, the furnace mouth cover 5 and the charging hole 4 can be protected by the cooling water pipes, high-temperature damage is avoided, and water circulation can be realized by the cooling water bin and the cooling water pipes in the use process.

The plurality of temperature sensors 15 are arranged at each position of the horizontal furnace body 1, so that temperature information in each position of the horizontal furnace body 1 can be conveniently and accurately acquired, corresponding adjustment can be timely made, and the quality of processed products can be ensured. The top surface of the furnace cover 5 is connected with a piston rod of a hydraulic cylinder 22, and the hydraulic cylinder 22 controls the opening or closing of the furnace cover 5. In the working process, the small gear ring 13 and the large gear ring 21 of the transmission system are in meshed transmission, the horizontal furnace body 1 is rotated by a certain angle, then the furnace opening cover 5 is opened, an external feeding screw, an air chute or a bin pump are used for feeding materials, after the materials are sufficient, the furnace opening cover 5 is closed through the hydraulic cylinder 22, then the main motor 11 drives the horizontal furnace body 1 to start rotating, alumina in the horizontal furnace body 1 rotates along with the rotation, then the combustor 6 ignites and heats, the temperature sensor 15 monitors the temperature in the horizontal furnace body 1 at any time, then a signal is transmitted to the control system, and the control system controls the highest temperature and the calcination time through the combustion and air inlet conditions of the combustor 6; the horizontal furnace body 1 is rotated by 180 degrees, the smoke discharging and blanking port 18 is rotated to face the right lower part, and then the horizontal furnace body 1 is swung at a small angle left and right, so that the discharging is more thorough; and then the horizontal furnace body 1 is rotated by 180 degrees again to the initial state, and the next production process is continuously completed. The large gear ring 21 is in contact with the horizontal furnace body 1 through the rolling ring 19, so that the horizontal furnace body 1 is prevented from having a thermal effect on a transmission system to influence the service life of the transmission system, the large gear ring 21 and the small gear ring 13 are ensured to be accurately meshed, and unnecessary heat loss is avoided.

Claims

1. A high temperature alumina calcining equipment is characterized in that: the device comprises a calcining furnace, a bearing system and a transmission system, wherein the calcining furnace comprises a horizontal furnace body (1), a charging hole (4) is formed in the top of the horizontal furnace body (1), a furnace opening cover (5) is arranged at the charging hole (4), a smoke discharging and blanking hole (18) is formed in the upper part of one end of the horizontal furnace body (1), a combustor (6) is installed at the other end of the horizontal furnace body, a temperature sensor (15) is arranged on one side of the horizontal furnace body (1), and the combustor (6) and the temperature sensor (15) are both connected with; the smoke outlet blanking port (18) is connected with the air inlet end of the high-temperature hot air circulating system through a hot air pipeline (3), and the air outlet end of the high-temperature hot air circulating system is communicated with the combustor (6) through a circulating air inlet pipeline (7); two ends of the periphery of the horizontal furnace body (1) are respectively provided with a rolling ring (19), the rolling rings (19) are matched with a bearing system below, one side of each rolling ring (19) is fixedly connected with a large gear ring (21), the large gear ring (21) is sleeved on the periphery of the horizontal furnace body (1), and the large gear ring (21) is in meshing transmission with a small gear ring (13) of a transmission system; one side of the horizontal furnace body (1) is provided with a plurality of sampling ports (20).

2. A high temperature alumina calcination apparatus as claimed in claim 1, wherein: the high-temperature hot air circulating system comprises a high-temperature dust remover (8) and a high-temperature fan (10), an air outlet of a hot air pipeline (3) is communicated with an air inlet of the high-temperature dust remover (8), an air outlet of the high-temperature dust remover (8) is communicated with an air inlet of the high-temperature fan (10) through an air outlet pipeline (9), and an air outlet of the high-temperature fan (10) is communicated with a combustor (6) through a circulating air inlet pipeline (7).

3. A high temperature alumina calcination apparatus as claimed in claim 1, wherein: the bearing system comprises two sets of side bearing roller sets and a set of bottom bearing roller (23), the bottom bearing roller (23) is arranged under the rolling ring (19), a set of side bearing roller sets are respectively arranged on two sides of the bottom bearing roller (23), the set of side bearing roller sets comprises two side bearing rollers (25), the side bearing rollers (25) and the bottom bearing rollers (23) are respectively matched with the rolling ring (19) in a rolling mode, and the side bearing rollers (25) and the bottom bearing rollers (23) are respectively fixed with the base (14) through supporting seats (24).

4. A high temperature alumina calcination apparatus as claimed in claim 1, wherein: 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), wherein a driving shaft of the main motor (11) is connected with one end of an input shaft of the main gear box (12) through a main motor coupler (26), and an output shaft of the main gear box (12) is connected with a shaft of the small gear ring (13) through a hydraulic internal contracting brake (33) and a low-speed coupler (32); the slow-motion motor (31) is connected with an input shaft of the slow-motion gear box (28) through a slow-motion coupler (29) and a slow-motion band-type brake (30), and an output shaft of the slow-motion gear box (28) is connected with the other end of the input shaft of the main gear box (12) through a shifting fork coupler (27).

5. A high temperature alumina calcination apparatus as claimed in claim 1, wherein: the central line of the burner (6) and the central axis of the horizontal furnace body (1) form an included angle, and the included angle ranges from 7 degrees to 25 degrees.

6. A high temperature alumina calcination apparatus as claimed in claim 1, wherein: a fine discharging adjusting unit (16) is additionally arranged below the horizontal furnace body (1) corresponding to the smoke discharging and blanking port (18).

7. A high temperature alumina calcination apparatus as claimed in claim 1, wherein: the gas collecting hood (2) is additionally arranged at the smoke discharging and blanking port (18), the gas 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 through an inverted cone-shaped hood body (17), the two annular support ring side plates (34), the inverted cone-shaped hood body (17) and the outer wall of the horizontal furnace body (1) jointly form a smoke collecting area, the outer wall of the horizontal furnace body (1) is in clearance fit with the inner diameters of the two annular support ring side plates (34), and a flexible sealing piece is arranged at the part of the outer wall of the horizontal furnace body (1) matched with the inner diameters of the annular support ring side plates; the top end and the bottom end of the inverted cone-shaped cover body (17) are respectively provided with a through hole, the hot air pipeline (3) is connected with the through hole at the top end of the inverted cone-shaped cover body (17), and the hot air pipeline (3) is flexibly connected with the inverted cone-shaped cover body (17).

8. A high temperature alumina calcination apparatus as claimed in claim 1, wherein: a cooling water pipe is arranged in the furnace mouth cover (5), and the cooling water pipe is connected with a cooling water bin arranged outside the horizontal furnace body (1).