Material drying device and method

Abstract

The invention discloses a material drying device and method. The material drying device comprises a rotary kiln, a drying sleeve and a propelling mechanism. The drying sleeve sleeves the outer side of the rotary kiln, one end of the drying sleeve is provided with a feed port, the other end of the drying sleeve is provided with a discharge port, and the drying sleeve is used for guiding materials needing to be dried and drying the materials through waste heat of the rotary kiln; the propelling mechanism comprises a spiral feeding blade, a spiral cleaning and scraping blade and a telescopic piece, the spiral feeding blade and the telescopic piece are fixedly arranged on the outer side of the rotary kiln and rotate along with the rotary kiln, and the spiral feeding blade is located on the inner side of the drying sleeve. According to the rotary kiln, the kiln body of the rotary kiln is sleeved with the drying sleeve, a channel for drying materials is formed, waste heat on the outer surface of the kiln body is used for drying, under the action of the spiral feeding blade and the spiral cleaning and scraping blade of the propelling mechanism, the materials are smoothly fed in the channel, the continuous drying and feeding process is achieved, and the drying efficiency is improved. And the materials can be continuously dried along with the continuous work of the rotary kiln.

Description

Technical Field

[0001] The invention relates to the technical field of rotary kiln waste heat recovery, and in particular to a material drying device and method. Background Art

[0002] A rotary kiln refers to a rotating calcining kiln, which belongs to the category of building materials equipment. According to the different materials processed, rotary kilns can be divided into cement kilns, metallurgical chemical kilns and lime kilns. Rotary kilns are widely used in many production industries such as building materials, metallurgy, chemical industry, and environmental protection. At present, the process production line using large rotary kilns for heating production has a high temperature on the outer surface of the rotary kiln, which can be as high as about 300 degrees Celsius. Most of the heat on the outer surface of the rotary kiln is not recycled, resulting in waste heat. For example, Chinese patent 201620257683.3 discloses a rotary kiln device, including a discharge barrel, a discharge hole is arranged on the barrel wall of the discharge barrel, and the rotary kiln device also includes: a discharge hood, a feed port and a discharge port are arranged on the discharge hood, and the feed port of the discharge hood is connected to the discharge hole.

[0003] For the above-mentioned prior art, there are also gradually emerging technical means for utilizing waste heat, such as using waste heat outside the kiln body to dry water-containing materials. However, since the kiln body rotates continuously during operation, if it is necessary to utilize the waste heat outside the outer surface of the kiln body with reduced loss, it is necessary to directly contact the material to be dried with the outer surface of the kiln body, and avoid the dried material from adhering to the outer surface of the kiln body during the drying process. Therefore, how to directly contact the material to be dried with the outer surface of the kiln body and avoid the dried material from adhering to the outer surface of the kiln body is a technical problem that needs to be solved. Summary of the invention

[0004] The purpose of the present invention is to overcome the above technical deficiencies and propose a material drying device and method to solve the technical problem of how to make the material to be dried directly contact with the outer surface of the kiln body and avoid the dried material from adhering to the outer surface of the kiln body in the prior art.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a material drying device, comprising: Rotary kiln; A drying sleeve, which is sleeved on the outside of the rotary kiln, has a feed port at one end and a discharge port at the other end, and is used to introduce materials to be dried and dry them using the residual heat of the rotary kiln; and The propulsion mechanism includes a spiral feed blade, a spiral scraping blade and a telescopic member. The spiral feed blade and the telescopic member are fixedly arranged on the outside of the rotary kiln and rotate with the rotary kiln. The spiral feed blade is located on the inner side of the drying sleeve. The spiral scraping blade is inserted in the spiral gap of the spiral feed blade and is connected to the telescopic end of the telescopic member. The telescopic member is used to drive the spiral scraping blade to move back and forth laterally in the spiral gap of the spiral feed blade.

[0006] In some embodiments, a strip groove is provided on the outside of the rotary kiln, and both ends of the strip groove extend to the outside of the two ends of the drying sleeve respectively. The telescopic end of the telescopic member is connected to the spiral scraping blade through a connecting rod, and the connecting rod is slidably connected to the inner side of the strip groove, and the length of the connecting rod is greater than the length of the drying sleeve. Splines are arranged in a circumferential distribution on the outer side of the connecting rod, and a key groove matching the spline is provided on the inner side of the strip groove.

[0007] In some embodiments, the outer edge and the inner edge of the spiral scraping blade are respectively in contact with the outer surface of the rotary kiln and the inner wall of the drying sleeve.

[0008] In some embodiments, a plurality of split openings are formed on the blade surface of the spiral scraping blade.

[0009] In some embodiments, a grid is provided between the plurality of segmentation openings.

[0010] In some embodiments, the thickness of the grid is less than the thickness of the spiral scraping blade.

[0011] In some embodiments, the plurality of grids have different inclination angles.

[0012] In some embodiments, a crushing mechanism is provided on the feed port to crush or disperse the material before it enters the drying sleeve.

[0013] In some embodiments, a control component is also included, which includes a controller, a feed valve and a temperature sensor. The temperature sensor is arranged on the outer surface of the rotary kiln to detect the outer surface temperature of the rotary kiln. The feed valve is arranged on the discharge end of the crushing mechanism to control the feed of the drying sleeve. The feed valve, temperature sensor and telescopic member are all electrically connected to the controller.

[0014] In a second aspect, the present invention further provides a material drying method, which is carried out according to the material drying device as described in any one of the above, comprising the following steps: Start the rotary kiln, heat the materials inside it normally, and monitor the temperature of the outer surface of the rotary kiln. When the temperature reaches the set value, open the feed port of the drying sleeve to introduce the materials; In the initial state, the spiral scraping blade is in contact with the surface of the spiral feeding blade. Under the rotation of the rotary kiln, the rotating material is driven to be fed from the feed port to the discharge port in the drying sleeve, and the feeding and drying are continued; In the breaking state, the telescopic part intermittently pushes the spiral scraping blade to move back and forth laterally in the spiral gap of the spiral feeding blade, squeezes and breaks up the material fed in the spiral gap, and scrapes the outer surface of the rotary kiln and the inner wall of the drying sleeve.

[0015] Compared with the prior art, the material drying device provided by the present invention forms a channel for material drying by sleeve-arranging a drying sleeve on the kiln body of the rotary kiln, utilizes the waste heat on the outer surface of the kiln body for drying, and feeds smoothly in the channel under the action of the spiral feeding blades and spiral scraping blades of the propulsion mechanism, has an uninterrupted drying and feeding process, can continuously dry the material as the rotary kiln continues to work, and effectively utilizes the waste heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional diagram of a material drying device provided in an embodiment of the present invention; Figure 2 is a partial perspective view of a material drying device provided by an embodiment of the present invention; Figure 3 is a three-dimensional diagram of a propulsion mechanism of a material drying device provided in an embodiment of the present invention; Figure 4 is a three-dimensional diagram of the spiral scraping blades of the material drying device provided by an embodiment of the present invention; Figure 5 is a three-dimensional diagram of the spiral propulsion blades of the material drying device provided by an embodiment of the present invention; Figure 6 It is a three-dimensional grid diagram of a material drying device provided in an embodiment of the present invention; Figure 7 It is a control block diagram of a material drying device provided in an embodiment of the present invention.

[0017] Description of reference numerals: 1. Rotary kiln; 101. Strip trough; 2. Drying sleeve; 201. Feed inlet; 202. Discharge outlet; 3. Propelling mechanism; 31. Spiral feeding blade; 32. Spiral scraping blade; 33. Telescopic member; 3301. Connecting rod; 3302. Spline; 3201. Splitting opening; 3202. Grid; 4. Crushing mechanism; 5. Control component; 51. Controller; 52. Feed valve; 53. Temperature sensor. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] In order to solve the technical problem of how to make the material to be dried directly contact with the outer surface of the kiln body and avoid the dried material from adhering to the outer surface of the kiln body, the present invention provides a material drying device and method, which can realize continuous and controllable utilization of the waste heat of the outer surface of the rotary kiln during the rotation of the rotary kiln, so that the dried material is in direct contact with the outer surface of the kiln body and avoids adhering to the outer surface of the kiln body.

[0020] It should be noted that the material drying device and method described in the present invention are used for but not limited to the drying of municipal sludge. For the convenience of explanation, in the present invention, only the application of the material drying device to the drying of municipal sludge is used as an example for explanation. The principles of applying the material drying device and method to other types of equipment are essentially the same as those applied to the drying of municipal sludge, and will not be repeated here.

[0021] See also Figure 1-2An embodiment of the present invention provides a material drying device, including a rotary kiln 1, a drying sleeve 2 and a propulsion mechanism 3; the drying sleeve 2 is sleeved on the outside of the rotary kiln 1 and supported on the ground by a bracket, or fixed on the base of the rotary kiln 1 by a bracket, a feed inlet 201 is provided at one end of the drying sleeve 2, and a discharge port 202 is provided at the other end, the feed inlet 201 is located at the upper part of the top end of the drying sleeve 2, and the discharge port 202 is located at the lower part of the bottom end of the drying sleeve 2, and the drying sleeve 2 and the propulsion mechanism 3 are connected. An annular space is formed between the outer surfaces of the kiln body of the rotary kiln 1, which is used to introduce the material to be dried into the annular space and dry it using the waste heat of the rotary kiln 1; in order to have a feeding effect on the material from feeding to discharging in the annular space, avoid material silting, enable continuous feeding and drying, and form an uninterrupted material drying process, the propulsion mechanism 3 includes a spiral feeding blade 31 and a spiral cleaning blade 32 and a telescopic member 33, the spiral feeding blade 31 and the telescopic member 33 They are all fixedly arranged on the outer side of the rotary kiln 1, and rotate with the rotary kiln 1 to form a spiral feeding structure. The rotation of the kiln body itself drives the rotation of the spiral feeding blade 31, so that the material entering the annular space is spirally pushed and moved from the feed port 201 toward the discharge port 202, and the feeding and drying can be continuous, with high working efficiency. The spiral feeding blade 31 is located on the inner side of the drying sleeve 2, and the spiral cleaning blade 32 is inserted in the spiral gap of the spiral feeding blade 31 and connected to the telescopic end of the telescopic member 33. The telescopic member 33 is used to drive the spiral cleaning blade 32 to move back and forth laterally in the spiral gap of the spiral feeding blade 31. The spiral cleaning blade 32 moves back and forth laterally in the spiral gap of the spiral feeding blade 31, which has the effect of squeezing, pushing and breaking up the material, avoiding agglomeration and blockage of the material during drying, and maintaining the smoothness of the entire drying feeding, feeding and discharging process.

[0022] In this embodiment, when the material is municipal sludge, due to its high water content, it will produce agglomeration and adhesion after drying. Therefore, a spiral scraper blade 32 is provided to break up the dried sludge, squeeze it and break it up, so as to avoid it from being retained in the drying sleeve 2 and forming a blockage; when the material is other particulate matter, or a substance that is not easy to agglomerate, the scraping amplitude of the spiral scraper blade 32 is controlled so that the gap between it and the spiral feed blade 31 will not cause extrusion-type damage to the particulate matter. Under the back and forth squeezing and pushing, it has the effect of breaking up the particulate matter, prompting it to concentrate, disperse, concentrate again, and disperse again, which is conducive to its rapid drying; the spiral feed blade 31 has thermal conductivity.

[0023] It should be noted that the rotary kiln 1 includes a base, a rotation drive mechanism and a kiln body. The rotation drive mechanism is installed on the base, and the kiln body is mounted on the movable end of the rotation drive mechanism to drive the kiln body to rotate. The above structures are all existing technologies and will not be repeated here. Among them, the drying sleeve 2 is mounted on the kiln body, and the kiln body is the main waste heat dissipation part, which refers to the outer surface of the kiln body. Therefore, the waste heat on the outer surface of the kiln body is utilized.

[0024] In one embodiment, see Figure 3 and Figure 5 In order to avoid affecting the drying of the material in the drying sleeve 2 when the spiral scraping blade 32 is telescopically driven to move back and forth laterally, a strip groove 101 is provided on the outer side of the rotary kiln 1, and the two ends of the strip groove 101 extend to the outside of the two ends of the drying sleeve 2 respectively. The telescopic end of the telescopic member 33 is connected to the spiral scraping blade 32 through a connecting rod 3301, and the connecting rod 3301 is slidably connected to the inner side of the strip groove 101, and the length of the connecting rod 3301 is greater than the length of the drying sleeve 2. Based on this, the connecting rod 3301 is accommodated in the strip groove 101, and the two ends of the connecting rod 3301 are in the telescopic state. The end is always located outside the drying sleeve 2, thereby ensuring that the part of the strip groove 101 in the drying sleeve 2 is embedded and filled by the connecting rod 3301, completing the circular surface of the part of the outer surface of the kiln body in the drying sleeve 2, and the connecting rod 3301 is embedded in the strip groove 101, and will not cause interference to the annular space. The outer side of the connecting rod 3301 is provided with splines 3302 in a circular distribution, and the inner side of the strip groove 101 is provided with a keyway matching the spline 3302. Through the matching of the spline 3302 and the keyway, the spline 3302 is embedded in the keyway and can slide relative to the keyway, thereby improving the stability of the telescopic movement.

[0025] In one embodiment, in order to scrape the inner wall of the drying sleeve 2 and the outer surface of the rotary kiln 1 during the lateral reciprocating movement of the spiral scraping blade 32 to prevent the material from sticking, please refer to Figure 2 and Figure 3 The outer edge and inner edge of the spiral scraping blade 32 respectively abut against the outer surface of the rotary kiln 1 and the inner wall of the drying sleeve 2, so that the outer surface of the rotary kiln 1 and the inner wall of the drying sleeve 2 are scraped during the lateral reciprocating movement.

[0026] In this embodiment, scrapers may be further provided on the outer edge and the inner edge of the spiral cleaning blade 32 to improve the overall cleaning quality.

[0027] In one embodiment, in order to have a shredding effect on the dried material, see Figure 4The surface of the spiral scraping blade 32 is provided with a plurality of split openings 3201, which can cut the dried material, such as sludge, during the reciprocating lateral movement to prevent it from sticking together.

[0028] For further information, see Figure 6 In order to form a more refined cutting effect, a grid 3202 is provided between the plurality of segmentation openings 3201, so as to cut the dried material, such as sludge, into grid blocks.

[0029] Furthermore, in order to embed the grid 3202 on the spiral scraping blade 32 and have an inclination angle different from the spiral curvature of the spiral scraping blade 32, the thickness of the grid 3202 is smaller than the thickness of the spiral scraping blade 32, thereby having space for angle adjustment.

[0030] Furthermore, the plurality of grids 3202 have different inclination angles, respectively, so that when moving horizontally, there is a superposition effect of cutting at different angles, forming a more refined fragmentation effect.

[0031] In one embodiment, see Figure 2 The feed port 201 is provided with a crushing mechanism 4 for crushing or breaking up the material before it enters the drying sleeve 2 so as to disperse the entering material.

[0032] It can be understood that the crushing mechanism 4 can adopt existing equipment with material crushing function such as a mixer and a crusher. Different crushing mechanisms are set according to different materials, and no limitation is made here.

[0033] In one embodiment, see Figure 7 In order to automatically control the drying process, a control component 5 is also included, which includes a controller 51, a feed valve 52 and a temperature sensor 53. The temperature sensor 53 is arranged on the outer surface of the rotary kiln 1 to detect the outer surface temperature of the rotary kiln 1. The feed valve 52 is arranged on the discharge end of the crushing mechanism 4 to control the feeding of the drying sleeve 2. The feed valve 52, the temperature sensor 53 and the telescopic member 33 are all electrically connected to the controller 51. Specifically, a starting temperature threshold is set. When the temperature detected by the temperature sensor 53 reaches the threshold, the controller 51 controls the feed valve 52 to open and feed. When the temperature is lower than the temperature threshold, the controller 51 controls the feed valve 52 to close and interrupt the feeding to avoid poor drying quality. In addition, an interval time of reciprocating horizontal pushing is set, and the telescopic member 33 is driven to extend and retract through the interval of the controller 51.

[0034] It can be understood that the controller 51 can adopt a device with control function such as PLC, and the telescopic member 33 can adopt a device with telescopic function such as hydraulic push rod, pneumatic push rod, etc., which is not limited here. In addition, the telescopic member 33 can adopt a pair, which are respectively arranged at both ends of the connecting rod 3301 to cooperate in the telescopic action.

[0035] In order to better understand the present invention, the following Figures 1 to 7 The technical scheme of the present invention is described in detail: the rotary kiln 1 heats the corresponding material, and its outer surface is heated up. When the temperature reaches the set temperature, the feed valve 52 on the feed port 201 is opened, and the material crushed by the crushing mechanism 4 is introduced from the feed port 201 into the annular space between the drying sleeve 2 and the outer surface of the kiln body, and the spiral feeding blade 31 is driven to rotate under the rotation of the kiln body to feed the material. During the feeding process, the waste heat generated by the kiln body is used to dry the material; during the drying process, the spiral cleaning blade 32 is driven to move back and forth horizontally by the telescopic member 33, so as to push and break up the material in the drying process. When the material is municipal sludge, the dividing port 3201 and the grid 3202 also have a chopping effect on it to avoid its drying agglomeration and blockage, and the spiral cleaning blade 32 also has a cleaning effect on the outer surface of the rotary kiln 1 and the inner wall of the drying sleeve 2 when it moves back and forth horizontally.

[0036] The present invention further provides a material drying method, which is performed according to the material drying device in any one of the above embodiments, comprising the following steps: The rotary kiln 1 is started to heat the material inside the rotary kiln 1 normally, and the outer surface temperature of the rotary kiln 1 is monitored. When the temperature reaches the set value, the feed port 201 of the drying sleeve 2 is opened to introduce the material; In the initial state, the spiral scraping blade 32 is in contact with the surface of the spiral feeding blade 31, and the rotating kiln 1 drives the rotating material to be fed from the feed port 201 to the discharge port 202 in the drying sleeve 2, and the feeding and drying are continued; In the breaking state, the telescopic member 33 intermittently pushes the spiral cleaning blade 32 to move back and forth laterally in the spiral gap of the spiral feeding blade 31, squeezes and breaks up the material fed in the spiral gap, and scrapes the outer surface of the rotary kiln 1 and the inner wall of the drying sleeve 2.

[0037] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A material drying device, characterized in that: include: Rotary kiln; The drying sleeve is sleeved on the outside of the rotary kiln, with a feed port at one end and a discharge port at the other end, for introducing the material to be dried and drying it using the residual heat of the rotary kiln; as well as The propulsion mechanism includes a spiral feed blade, a spiral scraping blade and a telescopic member. The spiral feed blade and the telescopic member are fixedly arranged on the outside of the rotary kiln and rotate with the rotary kiln. The spiral feed blade is located on the inner side of the drying sleeve. The spiral scraping blade is inserted in the spiral gap of the spiral feed blade and is connected to the telescopic end of the telescopic member. The telescopic member is used to drive the spiral scraping blade to move back and forth laterally in the spiral gap of the spiral feed blade.

2. The material drying device according to claim 1, characterized in that: A strip groove is provided on the outer side of the rotary kiln, and two ends of the strip groove extend to the outside of the two ends of the drying sleeve respectively. The telescopic end of the telescopic member is connected to the spiral scraping blade through a connecting rod, and the connecting rod is slidably connected to the inner side of the strip groove, and the length of the connecting rod is greater than the length of the drying sleeve. Splines are arranged in a circumferential distribution on the outer side of the connecting rod, and a key groove matching the spline is provided on the inner side of the strip groove.

3. The material drying device according to claim 2, characterized in that: The outer edge and the inner edge of the spiral scraping blade are respectively in contact with the outer surface of the rotary kiln and the inner wall of the drying sleeve.

4. The material drying device according to claim 3, characterized in that: A plurality of split openings are provided on the blade surface of the spiral scraping blade.

5. The material drying device according to claim 4, characterized in that: A grid is arranged between the plurality of split openings.

6. The material drying device according to claim 5, characterized in that: The thickness of the grid is smaller than the thickness of the spiral scraping blade.

7. The material drying device according to claim 6, characterized in that: The plurality of grids have different inclination angles respectively.

8. The material drying device according to claim 7, characterized in that: The feed port is provided with a crushing mechanism for crushing or breaking up the material before it enters the drying sleeve.

9. The material drying device according to claim 8, characterized in that: It also includes a control component, which includes a controller, a feed valve and a temperature sensor. The temperature sensor is arranged on the outer surface of the rotary kiln and is used to detect the outer surface temperature of the rotary kiln. The feed valve is arranged on the discharge end of the crushing mechanism and is used to control the feed of the drying sleeve. The feed valve, temperature sensor and telescopic member are all electrically connected to the controller.

10. A material drying method, characterized in that: The material drying device according to any one of claims 1 to 9 comprises the following steps: Start the rotary kiln, heat the materials inside it normally, and monitor the temperature of the outer surface of the rotary kiln. When the temperature reaches the set value, open the feed port of the drying sleeve to introduce the materials; In the initial state, the spiral scraping blade is in contact with the surface of the spiral feeding blade. Under the rotation of the rotary kiln, the rotating material is driven to be fed from the feed port to the discharge port in the drying sleeve, and the feeding and drying are continued; In the breaking state, the telescopic part intermittently pushes the spiral scraping blade to move back and forth laterally in the spiral gap of the spiral feeding blade, squeezes and breaks up the material fed in the spiral gap, and scrapes the outer surface of the rotary kiln and the inner wall of the drying sleeve.

Images