CN216159513U

CN216159513U - Drying furnace

Info

Publication number: CN216159513U
Application number: CN202121618423.1U
Authority: CN
Inventors: 茹晋波; 朱传强; 谢兴旺; 孙亭亭; 李渠
Original assignee: Everbright Envirotech China Ltd; Everbright Environmental Protection Research Institute Nanjing Co Ltd; Everbright Environmental Protection Technology Research Institute Shenzhen Co Ltd
Current assignee: Everbright Envirotech China Ltd; Everbright Environmental Protection Research Institute Nanjing Co Ltd; Everbright Environmental Protection Technology Research Institute Shenzhen Co Ltd
Priority date: 2021-07-15
Filing date: 2021-07-15
Publication date: 2022-04-01
Anticipated expiration: 2031-07-15

Abstract

The utility model discloses a drying furnace, which comprises a feeding unit, an air supply unit and a rotary kiln body, wherein the rotary kiln body sequentially comprises an end enclosure area, a kiln head area, a straight cylinder section area and a kiln tail area, the kiln head area adopts a bell mouth structure, the section of one end of the kiln head area close to the end enclosure area is smaller than that of one end of the straight cylinder section area, and a spiral guide plate is arranged in the kiln head area.

Description

Drying furnace

Technical Field

The utility model relates to the technical field of drying, in particular to a drying furnace.

Background

China is rich in agriculture and forestry biomass resources, and the utilization modes of the agriculture and forestry biomass resources are various, for example, high-quality wood and leftover materials left after processing are utilized to produce wood activated carbon with high added value, but in order to ensure the quality of the produced activated carbon, the used raw materials are required to have low water content, so the raw materials need to be dried.

At present, drying equipment on the market is various in types and has advantages and disadvantages, but the rotary drying furnace is widely adopted due to the advantages of simple structure, convenience in operation, strong adaptability, large yield and the like. However, the traditional rotary drying furnace has the defects that a kiln head easily forms accumulated material dead angles, the furnace is easy to fire after long-term heating, the structure of a kiln body is simple, the residence time of hot air is short, the drying efficiency is not high, and the like, and the rotary drying furnace cannot be completely suitable for drying wood raw materials.

Therefore, there is a need for a new drying oven to solve the above problems.

SUMMERY OF THE UTILITY MODEL

In the summary section a series of concepts in a simplified form is introduced, which will be described in further detail in the detailed description section. The inventive content of the present invention is not intended to define key features or essential features of the claimed solution, nor is it intended to be used to limit the scope of the claimed solution.

The utility model provides a drying furnace which comprises a feeding unit, an air supply unit and a rotary kiln body, wherein the rotary kiln body sequentially comprises an end enclosure area, a kiln head area, a straight cylinder section area and a kiln tail area, the kiln head area adopts a bell mouth structure, the section of one end, close to the end enclosure area, of the kiln head area is smaller than that of one end, close to the straight cylinder section area, of the kiln head area, and a spiral guide plate is arranged in the kiln head area.

Further, the air supply unit comprises a hot air pipeline, and the hot air pipeline extends into the kiln head area.

Further, the feed unit comprises a feed screw extending into the kiln head region.

Furthermore, the feeding screw device and the hot air pipeline are arranged in parallel, and the length of the hot air pipeline in the kiln head area is longer than that of the feeding screw device in the kiln head area.

Further, a first flow guide device is arranged at an air outlet of the hot air pipeline and comprises a spiral flow guide sheet.

Furthermore, a second flow guide device is arranged in the area of the straight cylinder section at intervals and comprises a spiral flow guide sheet.

Further, the top in the head region is provided with hot air inlet, and the bottom is provided with the bin outlet, the top in kiln tail region is provided with hot air outlet, and the bottom is provided with the discharge gate.

Furthermore, a gravity induction type flap valve is adopted at the discharge opening.

Furthermore, a shoveling plate is arranged in the area of the straight cylinder section and is parallel to the axis of the rotary kiln body.

Further, the rotary kiln body is obliquely arranged, and the kiln head area is higher than the kiln tail area.

According to the drying furnace provided by the utility model, the kiln head area of the rotary kiln body is of a bell mouth structure, and the spiral guide blade is arranged in the kiln head area, so that the defects of kiln head material return and easy formation of material accumulation dead angles on the kiln head are effectively overcome, and the fire hazard of the drying furnace is avoided.

Drawings

The following drawings of the utility model are included to provide a further understanding of the utility model. The drawings illustrate embodiments of the utility model and, together with the description, serve to explain the principles of the utility model.

In the drawings:

fig. 1 is a schematic structural view of a drying oven according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a first flow guide device according to an embodiment of the present invention.

Reference numerals

1. Feeding bin 2 and feeding screw

3. Hot air inlet 4 and hot air outlet

5. Gravity induction type flap valve 6, bleeder valve

7. Spiral stock guide 8, shovelling plate

9. First and second

flow guide devices

10 and 10

11. Rotary kiln body 12, riding wheel

13. Drive device 14, guide vane

15. Center shaft

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the utility model.

In the following description, a detailed description will be given to illustrate the dryer of the present invention in order to thoroughly understand the present invention. It is apparent that the practice of the utility model is not limited to the specific details known to those skilled in the art of drying. The following detailed description of the preferred embodiments of the utility model, however, the utility model is capable of other embodiments in addition to those detailed.

It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the utility model. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

Exemplary embodiments according to the present invention will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art. In the drawings, the thicknesses of layers and regions are exaggerated for clarity, and the same elements are denoted by the same reference numerals, and thus the description thereof will be omitted.

The existing rotary drying furnace generally adopts a cylindrical and straight cylinder type kiln body, adopts spiral feeding or chute feeding in front of the kiln, directly sends hot air into a seal head in front of the kiln, then extracts the hot air from the tail of the kiln, and dries the material by utilizing the heat of the hot air, and the structure has the following defects: 1. when the material layer of the kiln head of the straight-tube kiln body is thick, the materials are easy to fall out of the kiln head along with the rotation of the kiln body and are accumulated in the end socket to form accumulated materials which need to be cleaned manually at regular time, and the fire is easy to be generated when the cleaning is not in time; 2. the straight cylinder type kiln body is not provided with a turbulent flow device, the residence time of hot gas in the kiln is short, the disturbance of air flow in the kiln is weak, the heat exchange between materials and the air flow is weak, the heat utilization efficiency is low, and the drying efficiency is low; 3. the hot air is directly sent to the end socket and is led into the kiln body, if accumulated materials are formed in the end socket, the accumulated materials are directly blown by the hot air, and the possibility and the speed of the accumulated materials on fire are increased.

In order to solve the above problems, the present invention provides a drying furnace, as shown in fig. 1, including a feeding unit, an air supply unit, and a rotary kiln body 11, where the rotary kiln body 11 includes an end enclosure region, a kiln head region, a straight cylinder region, and a kiln tail region in sequence, the kiln head region adopts a bell mouth structure, a cross section of one end of the kiln head region close to the end enclosure region is smaller than a cross section of one end of the kiln head region close to the straight cylinder region, and a spiral material guide plate 7 is disposed in the kiln head region.

Illustratively, the feeding unit comprises a feeding bin 1 and a feeding screw 2, wherein the feeding bin 1 is used for storing materials and supplying the materials to the feeding screw 2, and the feeding screw 2 is used for conveying the materials into a rotary kiln body 11.

Exemplarily, the feed screw 2 extends through the head region into the kiln head region. In one embodiment, the length of the feed screw 2 in the region of the kiln head comprises in the range 150mm to 500 mm.

The feeding screw is prolonged, so that the materials are directly sent into the kiln body, and the materials are prevented from forming accumulated materials in the seal head area.

Exemplarily, the air supply unit comprises a hot air inlet 3 arranged at the top of the seal head area and a hot air pipeline communicated with the hot air inlet 3, wherein the hot air inlet 3 and the hot air pipeline form an 'L' shape, and the hot air pipeline extends into the kiln head area.

Further, the feeding screw 2 is arranged in parallel with the hot air pipeline, and the length of the hot air pipeline in the kiln head area is longer than that of the feeding screw in the kiln head area.

Further, a first flow guide device 9 is arranged at an air outlet of the hot air pipeline, and the first flow guide device 9 comprises a spiral flow guide sheet.

In one embodiment, as shown in fig. 2, the first guiding device 9 comprises a spiral guiding vane 14, one end of the spiral guiding vane 14 is rooted at the conical central shaft 15, the other end is fixedly connected with the pipe wall, and the inclination angle of the spiral guiding vane 14 ranges from 15 degrees to 30 degrees.

Hot air is directly sent into the kiln body instead of the end enclosure area by prolonging the hot air pipeline, so that the fire hazard caused by direct blowing and heating of accumulated materials in the end enclosure area under the extreme working condition is avoided; the extension length of the hot air pipeline in the kiln head area is larger than that of the feeding screw, so that the heating of the feeding screw can be effectively avoided, and the fire hidden danger caused by continuous heating of accumulated materials in the feeding screw when the feeding screw stops is avoided; meanwhile, a fixed spiral type flow deflector is additionally arranged at the air outlet of the hot air pipeline, so that hot air enters the kiln in a rotational flow mode and diffuses towards the periphery of the kiln wall, the diffusion angle of the air flow is increased, the contact between the air flow and materials is enhanced, and the heat exchange effect is enhanced.

Exemplarily, the rotary kiln body 11 sequentially comprises a seal head area, a kiln head area, a straight barrel section area and a kiln tail area, wherein the rotary kiln body 11 is obliquely installed, and the kiln head area is higher than the kiln tail area.

In one embodiment, the rotary kiln body 11 is supported by idlers 12 and rotated by a drive 13.

In one embodiment, the inclination angle of the rotary kiln body 11 ranges from 2 ° to 5 °.

The rotary kiln body is obliquely arranged, so that the materials can move towards the kiln tail under the action of gravity and are finally discharged from the kiln tail.

Illustratively, the kiln head area adopts a bell mouth structure, and the section of one end of the kiln head area close to the end socket area is smaller than the section of one end of the kiln head area close to the straight cylinder section area.

Through making kiln head region adopts the horn mouth structure, can make the material move to kiln tail direction fast, has avoided kiln head bed of material too thick to return to and fall into the regional long-pending material that forms of head along with the kiln body rotates.

In one embodiment, the angle of inclination of the bell mouth structure comprises 10 ° to 40 °.

Further, a spiral material guide plate 7 is arranged in the kiln head area and used for turning over materials and pushing the materials to move towards the kiln tail, and the materials are prevented from falling into the end socket area from the kiln head area to form accumulated materials.

Exemplarily, the bottom of the seal head area is provided with a discharge outlet, and a gravity induction type flap valve 5 is adopted at the discharge outlet.

The material returning to the end enclosure area under an extreme working condition can be discharged in time by arranging the discharge port at the bottom of the end enclosure area, so that the material accumulation is avoided; through set up gravity induction type flap valve in discharge gate department, when material weight reached the setting value, the flap valve was automatic to be opened, and the long-pending material of discharge has realized automatic monitoring, automatic row material.

Illustratively, a shovelling plate 8 is arranged in the area of the straight cylinder section, and the shovelling plate 8 is arranged parallel to the axis of the rotary kiln body 11.

Through set up the flight that is on a parallel with kiln body axis in the kiln body, when the rotary kiln body rotated, can stir the material, guarantee the contact of material and hot-air, strengthen the stoving effect, the flight of parallel axis simultaneously can slow down the speed of material to the kiln tail motion, the dwell time of extension material in the kiln body.

Exemplarily, second flow guiding devices 10 are arranged at intervals in the area of the straight cylinder section, and the second flow guiding devices 10 comprise spiral flow guiding sheets.

In one embodiment, 2-5 groups of spiral guide vanes are arranged in the area of the straight cylinder section at intervals.

The spiral flow deflectors are arranged in the straight barrel section area at intervals, so that the movement of the materials to the kiln tail direction is not influenced, the disturbance of hot air flow in the kiln body can be further enhanced, the air flow is forced to blow the materials on the inner wall of the barrel, the heat exchange between the air flow and the materials is enhanced, the retention time of the hot air flow in the kiln body can be prolonged, and the heat utilization efficiency is improved.

Illustratively, the top of the kiln tail area is provided with a hot air outlet 4, the bottom of the kiln tail area is provided with a discharge hole, and the discharge hole is provided with a discharge valve 6.

In one embodiment, the feeding bin 1 supplies materials to the feeding screw 2, the feeding screw 2 penetrates through the end enclosure area to convey the materials to the kiln head area, hot air or hot flue gas enters through a hot air inlet 3 at the top of the end enclosure area and is conveyed to the kiln head area through a hot air pipeline, and under the action of a first flow guide device 9 at an air outlet of the hot air pipeline, the hot air enters the kiln in a rotational flow mode, is diffused to the periphery of the kiln wall and is fully contacted with the materials; the kiln head region adopts a bell mouth structure to prevent materials from returning into the end enclosure region, a material outlet at the bottom of the end enclosure region adopts a gravity induction type flap valve 5 to automatically discharge accumulated materials, a spiral type material guide plate 7 is further arranged in the kiln head region to turn the materials and push the materials to move towards the kiln tail, the materials enter the straight cylinder section region through the kiln head region, a flight 8 is arranged in the straight cylinder section region to turn the materials and slow down the movement speed of the materials towards the kiln tail, second flow guide devices 10 are further arranged in the straight cylinder section region at intervals to enhance the disturbance of hot air flow in the kiln body, the heat exchange between the air flow and the materials is enhanced, the materials are fully dried, hot air or hot flue gas is discharged through a hot air outlet 4 at the top of the kiln tail region, and the dried materials are discharged through a material outlet at the bottom of the kiln tail region.

The present invention has been illustrated by the above embodiments, but it should be understood that the above embodiments are for illustrative and descriptive purposes only and are not intended to limit the utility model to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications are within the scope of the present invention as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a drying furnace, its characterized in that, includes the feed unit, air supply unit and the rotary kiln body, the rotary kiln body includes head region, kiln head region, straight section of thick bamboo region and kiln tail region in proper order, the kiln head region adopts the horn mouth structure, and it is close to the cross-section of the regional one end of head is less than and is close to the cross-section of the regional one end of straight section of thick bamboo, be provided with spiral stock guide in the kiln head region.

2. The drying oven of claim 1 wherein said air supply unit includes a hot air duct extending into said kiln head region.

3. The oven of claim 2 wherein said feed unit includes a feed screw extending into said kiln head region.

4. The drying oven as set forth in claim 3, wherein said feed screw is disposed in parallel with said hot air duct, said hot air duct having a length in said hood region greater than a length of said feed screw in said hood region.

5. The drying oven as claimed in claim 2, wherein a first deflector is disposed at the air outlet of the hot air duct, and the first deflector comprises a spiral deflector.

6. The drying oven of claim 1, wherein a second deflector is spaced within the area of the straight barrel section, the second deflector comprising a helical deflector.

7. The drying furnace as claimed in claim 1, wherein the top of the seal head region is provided with a hot air inlet, the bottom of the seal head region is provided with a discharge outlet, the top of the kiln tail region is provided with a hot air outlet, and the bottom of the kiln tail region is provided with a discharge outlet.

8. The oven of claim 7 wherein said discharge outlet is a gravity-induced flap valve.

9. The kiln as claimed in claim 1, characterized in that a flight is arranged in the region of the straight section, said flight being arranged parallel to the axis of the rotary kiln body.

10. The kiln as claimed in claim 1, wherein said rotary kiln body is installed obliquely, and said kiln head region is higher than said kiln tail region.