Rotary hot air kiln

Abstract

The utility model discloses a rotary hot air kiln, which comprises a base and a cylinder body with a horizontal structure, the cylinder body is rotatably assembled on the base through a support system, one end of the cylinder body is connected with a feeding box, the other end of the cylinder body is connected with a discharging box, and two ends of the cylinder body are respectively and rotatably matched with the feeding box and the discharging box. An air inlet box is fixedly connected outside the feeding box, a hot air inlet is formed in the air inlet box, an air outlet box is fixedly connected outside the discharging box, a hot air outlet is formed in the air outlet box, a fireproof heat insulation layer is arranged outside the air inlet box, a heat exchange pipe is arranged in the barrel, one end of the heat exchange pipe is communicated with the interior of the air inlet box, and the other end of the heat exchange pipe is communicated with the interior of the air outlet box. The rotary hot air kiln is indirect heating type equipment, pollution of hot air to materials can be avoided, and the investment cost of a follow-up tail gas treatment device is low; the multiple heat exchange pipes exchange heat with materials, the heat exchange area can be increased, the heat exchange efficiency is improved, and the occupied area of equipment is reduced.

Description

Technical Field

[0001] The utility model relates to a rotary hot air kiln, belonging to the technical field of material heating equipment. Background Art

[0002] In the prior art, there are usually two types of hot air kilns. One is a direct heating type hot air kiln, and the other is an indirect heating type hot air kiln.

[0003] For the direct heating type rotary hot air kiln, the hot air is in direct contact with the material to be heated, and heat exchange is carried out through direct contact between the hot air and the surface of the material, so as to remove the moisture of the material or change the physical or chemical properties of the material. Since the hot air is in direct contact with the material, the heat energy consumption is small; however, after the hot air contacts the material, subsequent treatment of the discharged tail gas is required, so a supporting tail gas treatment device is needed, and the investment cost is high.

[0004] For the indirect heating type rotary hot air kiln, the hot air is in indirect contact with the material to be heated, and after the hot air heats the heated surface, the heated surface contacts the surface of the material for heat exchange, so as to remove the moisture of the material or change the physical or chemical properties of the material. Its advantage is that it avoids the pollution of the material by the hot air, and the investment cost of the subsequent tail gas treatment device is low. Limited by the small area of the heated surface, it has the disadvantages of high heat energy consumption, and the equipment size specification is relatively large, and the floor area is large. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a rotary hot air kiln, which combines the advantages of the direct heating type rotary hot air kiln and the indirect heating type rotary hot air kiln in the prior art, and has a large heat exchange area, a small equipment specification size and a small floor area under the same processing capacity.

[0006] The utility model adopts the following technical scheme: a rotary hot air kiln, which comprises a base and a cylindrical body with a horizontal structure. The cylindrical body is rotationally assembled on the base through a support system. One end of the cylindrical body is connected with a feed box, and the other end is connected with a discharge box. The two ends of the cylindrical body are rotationally matched with the feed box and the discharge box respectively. An air inlet box is fixedly connected outside the feed box, and a hot air inlet is arranged on the air inlet box. An air outlet box is fixedly connected outside the discharge box, and a hot air outlet is arranged on the air outlet box. A refractory heat insulation layer is arranged outside the air inlet box. Heat exchange tubes are arranged inside the cylindrical body. One end of the heat exchange tube is communicated with the inside of the air inlet box, and the other end is communicated with the inside of the air outlet box.

[0007] The air inlet box is an annular structure arranged on the outer periphery of the feed box, the air outlet box is an annular structure arranged on the outer periphery of the discharge box, and sealing components are arranged between the air inlet box and the air outlet box and the cylindrical body respectively.

[0008] The diameters of the feed box and the discharge box are both smaller than the diameter of the cylinder body. The heat exchange tubes are distributed in a circumferential direction close to the inner wall surface of the cylinder body in the form of an annular array. The heat exchange tubes extend along the axial direction of the cylinder body. One end of the heat exchange tube is inserted into the air inlet box, and the other end is inserted into the air outlet box.

[0009] A vertically arranged discharge cylinder is connected to the end of the air outlet box. The air outlet is located at the bottom of the discharge cylinder and is arranged downward on the discharge cylinder.

[0010] A volatile matter outlet is provided at the top of the discharge cylinder.

[0011] A carrier gas port is provided on the feed box.

[0012] The feed inlet is arranged obliquely downward on the feed box. A chute pipe connected to the feed inlet is provided inside the feed box.

[0013] The hot air inlet is arranged at the lower part of the air inlet box, and the hot air outlet is arranged at the top of the air outlet box.

[0014] The cylinder body is arranged to incline downward from the feed direction to the discharge direction, and the inclination is less than 10°.

[0015] A refractory heat insulation layer is provided outside the air outlet box, or the air outlet box is made of heat-resistant steel material.

[0016] The beneficial effects of the present utility model are as follows: When the present utility model operates, the cylinder body rotates driven by the transmission mechanism. The high-temperature gas enters the air inlet box from the hot air inlet, and then is discharged into the air outlet box by the heating tubes and discharged from the hot air outlet. The material enters the cylinder body from the feed box and exchanges heat with the high-temperature gas in the heat exchange tubes in the cylinder body. The high-temperature gas heats or roasts the material through the heat exchange tubes. After the material is heated or roasted, it enters the discharge box and is discharged from the discharge port. The rotary hot air kiln of the present utility model is an indirect heating type device, which can avoid the pollution of the hot air to the material, and the investment cost of the subsequent tail gas treatment device is low; by exchanging heat between multiple heat exchange tubes and the material, the heat exchange area can be increased, the heat exchange efficiency can be improved, and the floor area of the device can be reduced.

[0017] Preferably, both the air inlet box and the air outlet box adopt an annular structure, which is convenient for the heating tubes to pass through the cylinder body and then be communicated with the air inlet box and the air outlet box at both ends respectively.

[0018] Preferably, an air inlet is provided on the feed box, and carrier gas can be introduced into the carrier gas port as needed. The carrier gas can take away the volatile matter of the material from the inside of the rotary kiln and finally be discharged from the volatile matter outlet at the top of the discharge cylinder.

[0019] Preferably, a chute pipe is provided at the feed inlet of the feed box, which can realize the smooth entry of the material from the upstream equipment into the cylinder body.

[0020] Preferably, the cylinder body is inclined to give the hot air kiln a certain slope. As the cylinder body rotates, the material moves from the feeding end to the discharging end, so that the heated or roasted material can be smoothly discharged from the discharging port.

[0021] Preferably, since the temperature of the high-temperature gas will decrease after heat exchange with the material, the working temperature of the air outlet box is lower than that of the air inlet box, and the material selection or refractory heat insulation layer can be set according to the actual working temperature. Brief Description of the Drawings

[0022] Figure 1 is a schematic diagram of a rotary hot air kiln according to an embodiment of the present invention;

[0023] Figure 2 is Figure 1 the operating schematic diagram of the rotary hot air kiln in

[0024] In the figure: 1 - cylinder body, 2 - feeding box, 3 - discharging box, 4 - feeding port, 5 - discharging port, 6 - discharging cylinder, 7 - volatile matter outlet, 8 - air inlet box, 9 - air outlet box, 10 - refractory heat insulation layer, 11 - hot air inlet, 12 - hot air outlet, 13 - sealing assembly, 14 - heat exchange tube, 15 - front roller ring, 16 - rear roller ring, 17 - fixed end idler support, 18 - free end idler support, 19 - large gear ring, 20 - drive system. Detailed Description of the Embodiment

[0025] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0026] As Figures 1 to 2 shown, a rotary hot air kiln according to an embodiment of the present invention includes a base and a cylinder body 1 with a horizontal structure. The cylinder body 1 is rotationally assembled on the base through a support system. A large gear ring 19, a front roller ring 15 and a rear roller ring 16 are provided on the cylinder body 1. The support system includes a fixed end idler support and a free end idler support. The front roller ring 15 and the rear roller ring 16 are respectively rotationally matched with the fixed end idler support and the free end idler support. A drive system is connected to the large gear ring 19. The drive system 19 includes a motor and a reducer.

[0027] One end of the cylinder body 1 is connected with a feeding box 2, and the other end is connected with a discharging box 3. The two ends of the cylinder body 1 are respectively rotationally matched with the feeding box 2 and the discharging box 3. An air inlet box 8 is fixedly connected to the outside of the feeding box 2, and a hot air inlet 11 is provided on the air inlet box 8. An air outlet box 9 is fixedly connected to the outside of the discharging box 3, and a hot air outlet 12 is provided on the air outlet box 9. A refractory heat insulation layer 10 is provided outside the air inlet box 8. A heat exchange tube 14 is provided inside the cylinder body 1. One end of the heat exchange tube 14 is communicated with the inside of the air inlet box 8, and the other end is communicated with the inside of the air outlet box 9. The hot air inlet is arranged at the lower part of the air inlet box, and the hot air outlet is arranged at the top of the air outlet box.

[0028] The air inlet box 8 is an annular structure arranged on the outer periphery of the feed box 2, the air outlet box 9 is an annular structure arranged on the outer periphery of the discharge box 3, and sealing components are respectively provided between the air inlet box 8 and the air outlet box 9 and the cylinder body 1. The diameters of the feed box and the discharge box are both smaller than the diameter of the cylinder body. The heat exchange tubes are distributed in a circumferential direction in an annular array near the inner wall surface of the cylinder body, and the heat exchange tubes extend along the axial direction of the cylinder body. One end of the heat exchange tube is inserted into the air inlet box, and the other end is inserted into the air outlet box.

[0029] A vertically arranged discharge cylinder 6 is connected to the end of the air outlet box 9. The discharge port 5 is located at the bottom of the discharge cylinder 6 and is arranged downward on the discharge cylinder 6. A volatile matter outlet 7 is provided at the top of the discharge cylinder 6. A carrier gas port (not shown in the drawings) is provided on the feed box 2. The feed port 4 is arranged obliquely downward on the feed box 2, and a chute pipe connected to the feed port 4 is provided in the feed box 2.

[0030] The cylinder body 1 is arranged to slope downward from the feed direction to the discharge direction, and the slope is less than 10°.

[0031] When the rotary hot air kiln of this embodiment is in use, the cylinder body makes a rotational movement driven by the transmission mechanism. High-temperature gas enters the air inlet box from the hot air inlet, then is discharged into the air outlet box by the heating tubes, and is discharged from the hot air outlet; the material enters the cylinder body from the feed box, exchanges heat with the high-temperature gas in the heat exchange tubes in the cylinder body, and the high-temperature gas heats or roasts the material through the heat exchange tubes. After the material is heated or roasted, it enters the discharge box and is discharged from the discharge port; if necessary, carrier gas can be introduced into the carrier gas port on the feed box, and the carrier gas is used to carry away the volatile matter of the material from the inside of the rotary kiln, and finally is discharged from the volatile matter outlet at the top of the discharge cylinder.

[0032] In the present utility model, the air inlet box is a stationary component, provided with a refractory heat insulation layer, resistant to high-temperature flue gas / thermal gas scouring and radiation; the feed box is a stationary component, and the feed box is provided with a chute pipe, which can realize the entry of the material from the upstream equipment into the cylinder body; the air outlet box is a stationary component, with a lower working temperature than the air inlet box, and the material selection or refractory layer can be set according to the actual working temperature. A hot air outlet is provided on the air outlet box; a discharge cylinder is connected to the discharge box, and a volatile matter outlet is provided at the top of the discharge cylinder for discharging the volatile matter generated during the heating / roasting process of the material. The discharge box is provided with a discharge port for discharging the material in the hot air kiln; the cylinder body, as a rotating component together with the heat exchange tubes and other accessory structures, is provided with power by the transmission system and makes a rotary movement on the support of the fixed-end and free-end idlers; a sealing component is provided between the rotating component and the stationary component to isolate the mutual leakage between the respective media, and the sealing component can select the end face / radial sealing structure according to the actual working conditions.

[0033] The rotary hot air kiln of the present utility model adopts measures such as selecting heat-resistant steel or lining castable for heat insulation at the part in contact with the hot air according to the high or low temperature of the hot air; there are many heat exchange tubes in the cylinder body of the hot air kiln, and indirect heat exchange is carried out with the materials to be heated / calcined through the heat exchange tubes; the hot air kiln has a certain slope, and the materials move from the feeding end (high point) to the discharging end (low point) with the rotation of the cylinder body.

[0034] The above embodiments and descriptions in the specification only illustrate the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed.

Claims

1. A rotary hot air kiln, comprising a base and a horizontal cylinder, the cylinder is rotatably mounted on the base through a support system, one end of the cylinder is connected to a feed box, and the other end is connected to a discharge box, and the two ends of the cylinder are respectively rotatably matched with the feed box and the discharge box, characterized in that: An air inlet box is fixedly connected to the outside of the feed box, and a hot air inlet is provided on the air inlet box; an air outlet box is fixedly connected to the outside of the discharge box, and a hot air outlet is provided on the air outlet box; a fire-resistant insulation layer is provided on the outside of the air inlet box, and a heat exchange tube is provided in the cylinder, one end of the heat exchange tube is connected to the inside of the air inlet box, and the other end is connected to the inside of the air outlet box.

2. The rotary hot air kiln according to claim 1, characterized in that: The air inlet box is an annular structure arranged on the periphery of the feed box, and the air outlet box is an annular structure arranged on the periphery of the discharge box. Sealing components are respectively provided between the air inlet box and the air outlet box and the cylinder body.

3. The rotary hot air kiln according to claim 2, characterized in that: The diameters of the feed box and the discharge box are both smaller than the diameter of the cylinder. The heat exchange tubes are distributed in a circular array in the circumferential direction close to the inner wall of the cylinder. The heat exchange tubes extend along the axial direction of the cylinder. One end of the heat exchange tube is inserted into the air inlet box and the other end is inserted into the air outlet box.

4. The rotary hot air kiln according to claim 1, characterized in that: The end of the air outlet box is connected to a vertically arranged discharge barrel, and the air outlet is located at the bottom of the discharge barrel, and the air outlet is arranged downward on the discharge barrel.

5. The rotary hot air kiln according to claim 4, characterized in that: A volatile matter outlet is arranged on the top of the discharge barrel.

6. The rotary hot air kiln according to claim 4, characterized in that: The feed box is provided with a carrier gas port.

7. The rotary hot air kiln according to claim 1, characterized in that: The feed port is arranged obliquely downward on the feed box, and a chute connected to the feed port is arranged in the feed box.

8. The rotary hot air kiln according to claim 1, characterized in that: The hot air inlet is arranged at the lower part of the air inlet box, and the hot air outlet is arranged at the top of the air outlet box.

9. The rotary hot air kiln according to claim 1, characterized in that: The cylinder is tilted downward from the feeding direction to the discharging direction, and the inclination is less than 10°.

10. The rotary hot air kiln according to claim 1, characterized in that: The outside of the air outlet box is provided with a fire-resistant heat-insulating layer, or the air outlet box is made of heat-resistant steel material.

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