CN212987988U

CN212987988U - Kiln head hot material cooling device suitable for rotary kiln

Info

Publication number: CN212987988U
Application number: CN202022001273.1U
Authority: CN
Inventors: 霍磊; 常彦鑫; 刘敏; 黄宝; 刘晓渊; 王浩
Original assignee: Pianguan Jindian Chemical Co ltd
Current assignee: Pianguan Jindian Chemical Co ltd
Priority date: 2020-09-14
Filing date: 2020-09-14
Publication date: 2021-04-16
Anticipated expiration: 2030-09-14

Abstract

The utility model discloses a kiln head hot material cooling device suitable for rotary kiln, cooling device includes kiln head sealed cowling and the cooler of below. The cooler is characterized in that a main air duct composed of a central axis tube and a cross beam is arranged in the cooler, a first cooling hood is arranged at the top end of the central axis tube, the lower end of the central axis tube is connected with an air inlet pipe, a second cooling hood is arranged on the cross beam, an air guide groove is arranged between the cross beams, a discharging valve and a temperature measuring instrument are sequentially arranged on a blanking device fixed at the bottom of the cooler, materials are cooled under the action of the hoods and the air guide groove after entering the cooling device, and the materials pass through the discharging valve after entering the blanking device and flow out of the device after temperature measurement is correct. The device can improve the cooling efficiency and ensure the sufficient and uniform cooling of the materials.

Description

Kiln head hot material cooling device suitable for rotary kiln

Technical Field

The utility model relates to a rotary kiln high temperature material cooling field, concretely relates to be suitable for and calcine in burnt precious stone industrial production rotary kiln hood hot material continuous cooling device of rotary kiln.

Background

The flint clay is a hard refractory clay material produced by using a rotary kiln, has stable components, uniform texture, heat resistance and sintering property, and is widely applied to the production of high-grade refractory materials, the manufacture of ceramic, aluminum silicate refractory fibers, military industry and other industries.

During the production of flint clay in a rotary kiln, the calcined flint clay is discharged from the kiln head at a temperature of about 800 ℃. Generally, the cooling speed of the high-temperature materials at normal temperature is too low, and the temperature of the high-temperature materials is reduced to below 90 ℃ by using a cooling system and then packaged and transported. The conventional cooling process is to use a single cooler to rotate or a chain grate machine to expose materials to air for slow cooling, but the method has the disadvantages of high cost of equipment, large occupied area, no way of effectively recovering and radiating heat sources and waste almost all heat.

The rotary kiln has the advantages of uniform calcination, large single-machine capacity and independent and controllable three sections of open type calcination, preheating and cooling, and can be applied to various industries for a long time due to the technical characteristics. Although the existing rotary kiln almost has a cooling part and a cooling function, the conditions of uneven temperature reduction, large temperature fluctuation of the kiln head, insufficient fuel combustion and low temperature reduction speed still exist, and the temperature reduction efficiency of the material agglomerated by the dual-edge reactor is low. And because the daily capacity of the rotary kiln can reach 2000 tons, the low efficiency of a cooling part seriously influences the running speed of the rotary kiln, and the working efficiency is reduced.

Disclosure of Invention

An object of the utility model is to provide a kiln head hot material cooling device suitable for rotary kiln improves cooling efficiency, guarantees the abundant, even cooling of material.

Cooling device include kiln head sealed cowling, cooler, main air duct, induced air groove, first cooling hood, second cooling hood, ejection of compact valve, air-supply line, thermoscope.

The main air duct is coaxial with the cooler, is a hollow tubular structure arranged in the cooler, and consists of a central shaft tube arranged along the falling direction of the material and a cross beam with the center communicated with the central shaft tube;

the top end of the central shaft tube is provided with a first cooling blast cap, and the lower end of the first cooling blast cap penetrates through the lower plane of the cooler and extends out of the cooler;

the other end of the beam is fixed on the cooler barrel body, and a second cooling hood is arranged on the beam;

the air guide groove is formed by parallel beams arranged between two adjacent second cooling air caps;

the charging chutes are uniformly distributed at the bottom of the cooler, discharge valves are arranged on the charging chutes, and temperature measuring instruments are arranged on the side walls of the charging chutes close to the discharge valves;

the air inlet pipe is connected with the tail end of the middle shaft pipe, which extends out of the cooler.

Furthermore, the kiln head hot material cooling device also comprises a chain plate conveyor which is arranged below a discharge valve of the cooler.

Preferably, the air guide groove is composed of a plurality of equal-edge angle steels, and the equal-edge angle steels are arranged in a mode that triangular edges face upwards and openings face downwards.

Preferably, the second cooling blast cap is arranged at the midpoint of each cross beam hollow tube.

Preferably, the number of the charging chutes is 4, and the charging chutes are uniformly distributed at the bottom of the cooler.

The cross beam is perpendicular to the central axis tube and is uniformly fixed at the same height position of the central axis tube.

Further, the temperature measuring instrument is arranged below the discharge valve.

Compare with current kiln head hot material cooling device, the utility model discloses an superiority lies in: 1) the air channels are uniformly arranged, but the air speed is not large, so that the air speed at the outlet is ensured to enable the air to pass through the materials but not to be blown away, and the cooling air is ensured to uniformly reach each corner; 2) a plurality of air caps are arranged to cool the materials in all directions, and air is dispersed along a cavity formed by the angle steel among the air caps by utilizing the angle steel and is folded back from the gap of the materials and then is diffused upwards, so that the materials are prevented from being blown away or returned to the rotary kiln; 3) the four discharging valves are not influenced by each other, the opening and closing states are respectively adjusted according to the respective outlet temperatures, other discharging valves are not influenced when problems occur, and the cooling efficiency is ensured; 4) the four electrically controlled pneumatic gate valves avoid the phenomena of valve plate inching and blocking caused by the aggregation of small materials inside, and effectively reduce operation faults. 5) The air emitted from the central shaft tube is diffused upwards after heat exchange, and the air required by fuel combustion in the kiln is continuously and stably provided, so that the hot air is recycled; 6) the device can adjust the air volume in real time according to the discharge temperature and the requirement, and is matched with materials with different volumes and qualities.

Drawings

Fig. 1 is a schematic cross-sectional structure of the device.

Fig. 2 is a schematic structural diagram of the main air duct of the device.

The numbers in the figure represent: the method comprises the following steps of 1-rotary kiln, 2-kiln head sealing cover, 3-cooler, 4-first cooling hood, 5-second cooling hood, 6-main air duct, 7-induced air groove, 8-blanking groove, 9-discharge valve, 10-temperature measuring instrument, 11-blanking device, 12-air inlet pipe, 13-centrifugal fan, 14-chain plate conveyor, 61-middle shaft pipe and 62-cross beam.

Detailed Description

As shown in fig. 1, the kiln head hot material cooling device of the rotary kiln 1 is composed of a kiln head sealing cover 2, a cooler 3 and a blanking device 11.

The kiln head sealing cover 2 adopts a full sealing structure, and ensures that the air after heat exchange returns to the rotary kiln stably.

The cooler 3 comprises a main air duct 6, an induced draft duct 7 and an air inlet pipe 12. The main air duct 6 is coaxial with the cooler 3, and is composed of a central axis tube 61 arranged along the falling direction of the material and a cross beam 62 with the center communicated with the central axis tube 61. The top end of the central shaft tube 61 is provided with a first cooling air cap 4, and the lower end of the first cooling air cap passes through the lower plane of the cooler 3 and extends out of the cooler 3. The other end of the cross beam 62 is fixed on the cooler cylinder body and consists of eight uniformly distributed hollow pipes, and a second cooling blast cap 5 is arranged at the middle point of each cross beam 62. As shown in fig. 2, the air inducing grooves 7 are disposed between the adjacent second cooling hoods 5, and are formed by eight groups of equilateral angle steels arranged in parallel, wherein the equilateral angle steels are arranged in such a manner that triangular edges face upward and openings face downward. The induced draft groove 7 is connected with the second cooling hood 5 to form an annular ventilation loop. One end of the air inlet pipe 12 is connected with the middle shaft pipe 61 and extends out of the end of the cooler 3, the other end is connected with the centrifugal fan 13, and cooling air generated by the centrifugal fan 13 enters the middle shaft pipe 61 along with the air inlet pipe 12 and then is dispersed on the cross beam 62.

As shown in fig. 1, the blanking device 11 is composed of a blanking slot 8, a discharge valve 9 and a temperature measuring instrument 10. The charging chutes 8 are uniformly arranged at the bottom of the cooler 3, discharge valves 9 are arranged on the charging chutes, and temperature measuring instruments 10 are arranged on the side walls of the charging chutes 8 below the discharge valves 9. The thermometer 10 selected in this embodiment is a thermocouple resistance thermometer. 11 below that the doffer that 3 lower extremes of cooler extend sets up a chain conveyor 14, uses the automatically controlled pneumatic push-pull valve through the transformation as ejection of compact valve 9 in this embodiment, avoids inside tiny material to aggregate and leads to the valve plate card to pause, the jam phenomenon, reduces the operation trouble.

When the cooling device works, high-temperature materials with the temperature of about 800 ℃ enter the kiln head sealing cover 2 through the rotary kiln 1 and are rotated from the kiln head to slide into the cooler 3. When the air cooler is in normal operation, the blast caps and the air channel are buried by materials, the external centrifugal fan 13 blows air into the cooler 3 from the air inlet pipe 12, one part of the air entering the main air channel 6 reaches the first cooling blast cap 4 through the central axis pipe 61, the other part of the air is dispersed to the second cooling blast cap 5 fixed at the middle section of the cross beam 62 along the 8 cross beams 62, is uniformly dispersed to two sides along the air induction groove 7, and is uniformly dispersed in an annular ventilation loop formed by the first cooling blast cap 4, the second cooling blast cap 5 and the air induction groove 7. The hot air after heat exchange is discharged to the rotary kiln 1 from the surface of the material to supplement the air in the kiln and participate in the combustion of the coal powder. The temperature measuring instrument 10 detects the actual temperature of the materials in the blanking device 11, only one discharge valve 9 is opened during normal operation, the temperature of the materials flowing out in the discharging process of the discharge valve 9 can be gradually increased, the temperature measuring instrument 10 arranged on the blanking groove 8 where the temperature measuring instrument is located is digitally increased, when the temperature of the materials is higher than 90 ℃, the corresponding valves are controlled to be closed through signal transmission, the adjacent discharge valves 9 are opened in sequence to discharge, the four discharge valves 9 are opened in sequence and are circulated, and the flowing materials are transported to a stockyard through the chain plate conveyor 14. When special conditions occur, the temperature of the materials after circulation is higher than 90 ℃, the circulation is closed, the discharge valve 9 is completely closed, and meanwhile, an alarm is triggered to inform operators.

Claims

1. A kiln head hot material cooling device comprises a kiln head sealing cover and a cylindrical cooler arranged below the kiln head sealing cover, and is characterized in that the cooler comprises the following parts:

the main air duct is coaxial with the cooler and consists of a central shaft tube arranged along the falling direction of the material and a cross beam with the center communicated with the central shaft tube, a first cooling air cap is arranged at the top end of the central shaft tube, the lower end of the first cooling air cap penetrates through the lower plane of the cooler and extends out of the cooler, the other end of the cross beam is fixed on the cylindrical body of the cooler, and a second cooling air cap is arranged on the cross beam;

the eight air guide grooves are formed by a pair of parallel beams arranged between two adjacent second cooling air caps;

at least four charging chutes which are distributed at the bottom of the cooler and provided with discharge valves, and temperature measuring instruments are arranged on the side walls of the charging chutes close to the discharge valves;

and the air inlet pipe is connected with the tail end of the central shaft pipe, which extends out of the cooler.

2. The kiln head hot material cooling device as claimed in claim 1, further comprising a chain plate conveyor disposed below the discharge valve of the cooler.

3. The kiln head hot material cooling device as claimed in claim 1, wherein the other end of the air inlet pipe is connected with a centrifugal fan.

4. The kiln head hot material cooling device as claimed in claim 1, wherein the induced draft groove is composed of equilateral angle steel, and the equilateral angle steel is arranged in a way that a triangular edge faces upwards and an opening faces downwards.

5. The kiln head hot material cooling device as claimed in claim 1, wherein the second cooling blast cap is arranged at the middle point of each cross beam hollow tube.

6. The kiln head hot material cooling device as claimed in claim 1, wherein the number of the charging chutes is 4, and the charging chutes are uniformly distributed at the bottom of the cooler.

7. The kiln head hot material cooling device as claimed in claim 1, wherein the cross beam is perpendicular to the bottom bracket tube and is uniformly fixed at the same height position of the bottom bracket tube.

8. The kiln head hot material cooling device as claimed in claim 1, wherein the temperature measuring instrument is arranged below the discharge valve.