A high-efficiency sludge filter cake dryer

Abstract

The invention relates to the technical field of sludge treatment, and specifically discloses a sludge filter cake high-efficiency dryer, comprising a drying box, a feed hopper, a belt conveyor, a hot air system and an exhaust dehumidification system, wherein the belt conveyor comprises a conveyor belt arranged inside the drying box, the feed hopper is arranged just above one end of the conveyor belt, a material springing device is arranged in the drying box, the material springing device comprises a rotating column, a power assembly is connected to the lower end of the rotating column, a lifting block is sleeved on the rotating column, a top roller acting on the conveyor belt is connected to the lifting block through a vertical rod, a guide slide bar is arranged in the connecting frame, a slide hole matching the guide slide bar is opened on the lifting block, and a spring is connected between the connecting frame and the lifting block; the sludge filter cake high-efficiency dryer disclosed by the invention realizes continuous drying treatment of the sludge filter cake, greatly improves the drying efficiency of the sludge filter cake, and greatly improves the drying uniformity of the sludge filter cake through the action of the material springing device.

Description

Technical Field

[0001] The invention relates to the technical field of sludge treatment, and in particular discloses a high-efficiency dryer for sludge filter cakes. Background Art

[0002] Sludge cake is a solid waste obtained by dehydrating sewage with a filter press. The water content of the sludge cake obtained after the filter press is generally around 45%, so the sludge cake still needs to be dried. Existing sludge drying equipment mainly includes paddle sludge dryer and belt sludge dryer. The paddle sludge dryer is mainly composed of a shell and hollow blades densely arranged on a hollow shaft. During the drying process, the heat medium provided by water vapor or heat transfer oil flows into the blades through the hollow shaft. While continuously stirring the wet sludge, the sludge surface is heated and a large amount of water is evaporated through indirect contact with the material through heat energy. It is especially suitable for drying sludge with a high water content. The belt sludge dryer consists of a chassis and a conveyor belt with air holes. During the conveyor belt conveyor, hot air is sent into the chassis to dry the sludge. It has a high sludge drying efficiency, but is not suitable for sludge with a high water content.

[0003] For example, the utility model patent with application number 2018220249608 discloses a sludge thermal drying machine, including a feeding device, a crushing device, a mud control device, a transmission device and a discharge end arranged in sequence, and the transmission device includes a first transmission part and a second transmission part, and the first transmission part and the second transmission part are arranged in parallel in the vertical direction; a radiation source is arranged between the first transmission part and the second transmission part. The sludge thermal drying machine disclosed in the utility model is a kind of belt sludge dryer, which is suitable for drying sludge filter cakes. However, the sludge thermal drying machine has the problems of uneven sludge drying and low drying efficiency when drying sludge. This is because the sludge filter cake remains stationary during the conveying process with the conveyor belt, and the dry hot air enters from the bottom of the casing, and then flows directly from the front and rear sides of the conveyor belt to the top of the sludge filter cake, so that the sludge filter cake is not in sufficient contact with the dry hot air, especially the sludge filter cake accumulated in the middle part of the conveyor belt, which is surrounded by other sludge filter cakes and cannot be in contact with the flowing hot air. Therefore, in view of the above-mentioned deficiencies of the existing sludge thermal drying machines, the present application proposes a sludge filter cake high-efficiency drying machine that can effectively solve the above-mentioned technical problems. Summary of the invention

[0004] The present invention aims to provide a high-efficiency dryer for sludge filter cakes, so as to solve the problems of uneven drying and low drying efficiency in existing sludge thermal drying machines when drying sludge filter cakes.

[0005] The present invention is achieved through the following technical solutions:

[0006] A sludge filter cake high-efficiency dryer comprises a drying box, a feed hopper, a belt conveyor, a hot air system and an exhaust dehumidification system, wherein the belt conveyor comprises a conveyor belt arranged inside the drying box, the feed hopper is arranged just above one end of the conveyor belt, the drying box is provided with a material ejecting device for instantly ejecting the sludge filter cake on the conveyor belt, the material ejecting device comprises a strip plate fixedly connected to the drying box, a vertical plate is arranged on the strip plate, a rotating column is rotatably connected to the vertical plate, a power assembly is connected to the lower end of the rotating column, a lifting block is sleeved on the rotating column, a top roller acting on the conveyor belt is connected to the lifting block through a vertical rod, a connecting frame is fixed on the vertical plate, a guide slide bar is arranged in the connecting frame, a sliding hole matching the guide slide bar is opened on the lifting block, and a spring is connected between the connecting frame and the lifting block, an ejection guide groove connected by a one-way spiral segment and a vertical line segment end to end is opened on the outer circumference of the ejection roller, and a pulley matching the ejection guide groove is arranged in the lifting block.

[0007] As a further configuration of the above scheme, the belt conveyor device also includes a plurality of belt rollers and a tension adjustment roller, the transmission belt is wound between the belt rollers and the tension adjustment roller, and one of the belt rollers is connected to a driving device.

[0008] As a further configuration of the above solution, a U-shaped frame is connected to the tension adjustment roller, and an elastic telescopic component is connected between the U-shaped frame and the inner wall of the drying box.

[0009] As a further configuration of the above scheme, the upper surface of the drying box is provided with a strip opening arranged perpendicular to the direction of the conveyor belt, the lower end of the feed hopper extends into the interior of the drying box through the strip opening, and the drying box is provided with a pushing cylinder for pushing the feed hopper to move along the direction of the strip opening.

[0010] As a further configuration of the above scheme, a material leveling component for evenly spreading the sludge filter cake on the conveyor belt is arranged inside the drying box near the feed hopper.

[0011] As a further configuration of the above scheme, the hot air device includes a hot air generator, the hot air generator is connected to a hot air pipe extending into the drying box, the hot air pipe is connected to two exhaust pipes arranged parallel to the direction of the conveyor belt, and the exhaust pipe is provided with an air outlet.

[0012] As a further configuration of the above solution, arc-shaped air guide strips are fixed on the inner walls of the drying box located on both sides of the conveyor belt.

[0013] As a further configuration of the above scheme, the exhaust dehumidification system includes an exhaust hood arranged on the top of the drying box, the exhaust hood is connected to the drying filter box through an exhaust pipe, and the drying filter box is connected to an exhaust pump.

[0014] When the sludge filter cake high-efficiency dryer disclosed in the present invention is in operation, the crushed sludge filter cake is evenly spread on the upper surface of the conveyor belt through the feed hopper, so that it is transported inside the drying box along the conveyor belt. The hot air system generates dry hot air through the hot air generator, and flows upward from both sides of the conveyor belt through the hot air pipe and the exhaust pipe. Part of the dry hot air will pass through the pores on the surface of the conveyor belt and contact the sludge filter cake on the bottom layer of the conveyor belt for drying, and the other part will flow upward through the gap between the conveyor belt and the side wall of the drying box, and then under the action of the arc-shaped air guide strip, the hot air is blown to the upper surface of the sludge filter cake on the conveyor belt for drying.

[0015] When the sludge filter cake is moving and transported on the conveyor belt, the ejection device will operate intermittently, and the rotating column will be rotated by the power component. Then, the lifting block will move downward first through the action between the ejection guide groove on the rotating column and the pulley on the lifting block to accumulate energy for the spring. The lifting block will then be released instantly to cause the push roller to move upward instantly. The conveyor belt will jump upward through the instantaneous upward impact of the push roller. The sludge filter cake on this part of the conveyor belt will be ejected, and then fully contacted with the hot air during the ejection and throwing process, so that the internal sludge filter cake can also be quickly dried.

[0016] During the drying process, the hot and humid air generated after contact with the sludge filter cake will be drawn into the drying filter box by the exhaust dehumidification system, and will be discharged after being dehumidified and deodorized by the filter layer inside the drying filter box. Finally, after the moisture content of the sludge filter cake drops below 10%, it will be transported to the discharge hopper by the conveyor belt, and the dried sludge filter cake will be discharged from the drying box by the discharge hopper.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The sludge filter cake high-efficiency dryer disclosed in the present invention realizes continuous drying treatment of the sludge filter cake, greatly improving the drying efficiency of the sludge filter cake; at the same time, in the process of the sludge filter cake being transported along the conveyor belt, the sludge filter cake at the bottom of the conveyor belt can contact with the hot air flowing into the pores, and the upper sludge filter cake can contact with the hot air after being guided, and the sludge filter cake can be ejected and thrown up during the transportation process through the action of the ejection device, and then can be fully contacted with the hot air during the throwing up process, which fully ensures the drying effect of the inner layer sludge filter cake and greatly improves the drying uniformity of the sludge filter cake.

[0019] The ejection device in the present invention has an ingenious structural design. The rotation of the rotating column and the guiding action between the pulley and the ejection guide groove enable the lifting block to move downward first and accumulate energy for the spring. The lifting block is then released instantly to cause the push roller to rise instantly and hit the conveyor belt, thereby enabling the sludge filter cake on the conveyor belt to be ejected a certain distance. The ejected sludge filter cake then contacts with hot air, thereby greatly improving the drying effect on the inside of the sludge filter cake.

[0020] The sludge filter cake high-efficiency dryer disclosed in the present invention also enables the sludge filter cake to be fed evenly through the design of the feed hopper and the material leveling component, and then the sludge filter cake on the conveyor belt is evenly spread out by using the material leveling component, thereby effectively increasing the effective contact area between the sludge filter cake and the hot air during the movement of the conveyor belt, and improving the drying speed of the sludge filter cake. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the front three-dimensional structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the back three-dimensional structure of the present invention;

[0024] Figure 3 It is a schematic diagram of the three-dimensional structure inside the drying box of the present invention;

[0025] Figure 4 It is a schematic diagram of the side plan structure of the drying box in the present invention;

[0026] Figure 5 It is a schematic diagram of the three-dimensional structure of the material device in the present invention;

[0027] Figure 6 It is a schematic diagram of the three-dimensional structure of the rotating column, lifting block, and push roller in the present invention;

[0028] Figure 7 It is a schematic diagram of the plane structure of the connection of the tension adjustment roller, the telescopic rod, the inserting tube, etc. in the present invention;

[0029] Figure 8 It is a schematic diagram of the three-dimensional structure of the feed hopper, telescopic folding plate, rollers, etc. in the present invention. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0031] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Figures 1 to 8 , and describes the application in detail with reference to embodiments. Example 1

[0032] Example 1 discloses a sludge filter cake high efficiency dryer, see attached Figure 1-3 The main body of the dryer includes a drying box 1, a feed hopper 2, a belt conveyor 3, a hot air system 4 and an exhaust dehumidification system 5. The drying box 1 is a rectangular parallelepiped as a whole, and a plurality of pads 101 are arranged on its lower surface, so that the drying box 1 can be stably moved above the ground. Then the feed hopper 2 is arranged at the left end of the upper surface of the drying box 1, and the lower end of the feed hopper 2 is extended into the interior of the drying box 1, and a discharge hopper 103 is arranged on the right side of the drying box 1. When the sludge filter cake is dried, the sludge filter cake is first fully crushed by a crusher, and then the crushed sludge filter cake is sent to the feed hopper 2 by a hoist.

[0033] The belt conveyor 3 includes a conveyor belt 301 disposed inside the drying box 1, and the left end of the conveyor belt 301 is located directly below the feed hopper 2. A large number of air holes (not shown in the figure) are arranged on the surface of the conveyor belt 301, so that the hot air can contact the sludge filter cake at the bottom through the air holes to improve the drying effect of the sludge filter cake. A plurality of belt rollers 302 and a tension adjustment roller 303 are arranged inside the drying box 1, so that the conveyor belt 301 can be wound between the belt rollers 302 and the tension adjustment roller 303. At the same time, a driving device 304 connected to one of the belt rollers 302 is also arranged on the front side of the drying box 1, so that the conveyor belt 301 can move stably under the power of the driving device 304.

[0034] The hot air system 4 includes a hot air blower 401 disposed on the back of the drying box 1. Of course, the hot air blower 401 can also be replaced by other hot air generators such as a hot air furnace. A hot air pipe 402 is connected to the air outlet of the hot air blower 401, and then the hot air pipe 402 is extended into the interior of the drying box 1. The hot air pipe 402 located inside the drying box 1 is connected to two exhaust pipes 403 arranged parallel to the conveying direction of the conveyor belt 301. The two exhaust pipes 403 are respectively located on both sides of the conveyor belt 301, and then a plurality of air outlets are arranged at intervals on the exhaust pipe 403. A part of the drying hot air generated by the hot air blower 401 will contact the bottom sludge filter cake through the air holes on the conveyor belt 301, and the other part will flow from the side of the conveyor belt 301 to the top of the conveyor belt 301. In order to ensure that the drying hot air flowing upward is in full contact with the upper sludge filter cake on the surface of the conveyor belt 301, arc-shaped air guide strips 102 are fixed on the inner wall of the drying box 1 on both sides of the conveyor belt 301 (see attached Figure 4 ), so that the hot air flow can be blown toward the upper sludge filter cake on the surface of the conveyor belt 301 under the action of the arc-shaped air guide strips 102.

[0035] The exhaust dehumidification system 5 includes a plurality of exhaust hoods 501 arranged at intervals on the upper surface of the drying box 1, and an exhaust pipe 502 is commonly connected to the upper ends of the plurality of exhaust hoods 501, and then the end of the exhaust pipe 502 is connected to a drying filter box 503, and an exhaust pump 504 is connected to the side of the drying filter box 503. In order to ensure that the gas discharged from the exhaust pump 504 is dry and odorless, the drying filter box 503 is provided with a desiccant and an activated carbon adsorbent.

[0036] Reference Figure 3-6 , a feeding device 6 is arranged inside the conveyor belt 301, and the specific feeding device 6 is set to 2-4 according to the effective conveying length of the conveyor belt 301. The feeding device 6 comprises a strip plate 601 fixedly connected to the side wall of the drying box 1, a vertical plate 602 is arranged on the strip plate 601, and then a bearing 603 is arranged at the lower end of the vertical plate 602, and a rotating column 604 is rotatably connected in the bearing 603, and a gear box 605 connected to the rotating column 604 is arranged at the lower end of the vertical plate 602, and a rotating motor (not shown in the figure) connected to the gear box 605 is arranged on the back of the vertical plate 602, and the rotating column 604 can stably rotate in the bearing 603 through the action of the rotating motor and the gear box 605.

[0037] An ejection guide groove 606 is provided on the outer circumference of the rotating column 604. The ejection guide groove 606 consists of a one-way spiral segment 6061 and a vertical line segment 6062. The upper and lower ends of the vertical line segment 6062 are connected to the upper and lower ends of the one-way spiral segment 6061. A lifting block 607 is sleeved on the rotating column 604, and a pulley 608 matching the ejection guide groove 606 is provided in the lifting block 607. Then, vertical upright poles 609 are connected to the left and right ends of the lifting block 607, and a top roller 610 for acting on the conveyor belt 301 is connected to the top of the two upright poles 609. At the same time, two C-shaped connecting frames 611 are arranged on the vertical plate 602, and a vertical guide slide 612 is arranged in each connecting frame 611, and then sliding holes matching the guide slide 612 are opened on the left and right ends of the lifting block 607, so that the guide slide 612 passes through the sliding holes on the lifting block 607, and finally a spring 613 is arranged between the lower end or the upper end of the lifting block 607 and the connecting frame 611, and the spring is arranged on the outer periphery of the guide slide 612.

[0038] In the process of operation, the ejection device 6 in this embodiment rotates the rotating column 604 around the bearing 603 through the action of the rotating motor and the gear box 605, and then the lifting block 607 moves downward and presses down the spring 613 to accumulate momentum due to the action of the one-way spiral segment 6061 on the pulley 608 during the rotation of the rotating column 604. When the rotating column 604 rotates to make the pulley 608 move to the lower end of the one-way spiral segment 6061, the pulley 608 will move to the lower end of the vertical line segment 6062, and the spring 613 will be released instantly, so that the lifting block 607 moves upward along the guide slide bar 612 instantly, and then the conveyor belt 301 jumps upward through the instantaneous upward impact of the push roller 610, and the sludge filter cake on this part of the conveyor belt 301 will be ejected, and then fully contact with the hot air sent in during the ejection and throwing process, so that the internal sludge filter cake can also be quickly dried.

[0039] Reference Figure 3 and attached Figure 7 In this embodiment, U-shaped frames 305 are connected to both ends of the tension adjustment roller 303, and a telescopic rod 306 is arranged at one end of the U-shaped frame 305 facing the side of the drying box 1, and an inserting tube 307 matching the telescopic rod 306 is arranged on the inner side of the drying box 1, and the telescopic rod 306 is inserted into the inserting tube 307, and an elastic member 308 is connected between the telescopic rod 306 and the inner wall of the inserting tube 307. Through the above design of the tension adjustment roller 303 and the auxiliary components, it is ensured that the transmission can still be stable when the elastic device 6 acts on the transmission belt 301. Example 2

[0040] Example 2 discloses a sludge cake high-efficiency dryer with an improved design based on the technical solution of Example 1. Figure 1 , Attachment Figure 2 , Attachment Figure 3 , Attachment Figure 4 and attached Figure 8 .

[0041] The improvements of this embodiment 2 include opening a strip opening perpendicular to the conveying direction of the conveyor belt 301 on the upper surface of the drying box 1, and then extending the lower end of the feed hopper 2 through the strip opening into the interior of the drying box 1, and a telescopic folding plate 201 is provided between the lower end of the feed hopper 2 and the two ends of the strip opening.

[0042] A row of rollers 202 are connected to both left and right ends of the feed hopper 2, and then a roller track 104 matching the rollers 202 is arranged on the upper surface of the drying box 1. In order to realize the movement of the feed hopper 2 along the direction of the strip-shaped opening so that the sludge filter cake can be evenly sprinkled on the upper surface of the conveyor belt 301, a pushing cylinder 105 is also arranged at the upper end of the drying box 1, and the end of the telescopic cylinder 105 is connected to the feed hopper 2, so that the feed hopper 2 moves back and forth along the strip-shaped opening under the action of the pushing cylinder 105.

[0043] In addition, a material leveling assembly 7 is provided in the drying box 1 near the side of the feed hopper 2, and the material leveling assembly 7 includes a mounting plate 701 fixedly connected to the inner wall of the drying box 1, and a plurality of lifting rods 702 are provided through the mounting plate 701, and then a material leveling rake plate 703 is commonly connected to the lower ends of all the lifting rods 702, and a spring is also connected between the material leveling rake plate 703 and the mounting plate 701. Through the structural design of the material leveling assembly, during the conveying and drying process of the sludge filter cake on the conveyor belt 301, the sludge filter cake can be evenly dispersed on the upper surface of the conveyor belt 301 through the material leveling rake plate 703, so that it has a larger contact area with the hot air.

[0044] Finally, in the present embodiment 2, a cleaning port 106 is provided on the lower surface of the drying box 1 near the discharge hopper 103, and a guide rod 107 is provided above the cleaning port 106, and then a scraper plate 108 in contact with the bottom wall of the drying box 1 is slidably provided on the guide rod 107, and a screw drive assembly 109 for moving the scraper plate 108 is provided at the lower end of the drying box 1. The scraper plate 108 can move from the left end to the right end of the drying box 1 under the action of the screw drive assembly 109, and then during the movement, the scraper plate 108 pushes the materials falling on the lower end of the drying box 1 to the cleaning port 106 for centralized discharge.

[0045] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sludge filter cake high-efficiency dryer, comprising a drying box, a feed hopper, a belt conveyor, a hot air system and an exhaust dehumidification system, wherein the belt conveyor comprises a conveyor belt arranged inside the drying box, and the feed hopper is arranged just above one end of the conveyor belt, characterized in that: The drying box is provided with a material ejecting device for instantly ejecting the sludge filter cake on the conveyor belt, and the material ejecting device includes a strip plate fixedly connected to the drying box, a vertical plate is provided on the strip plate, a rotating column is rotatably connected on the vertical plate, a power assembly is connected to the lower end of the rotating column, a lifting block is sleeved on the rotating column, and a top roller acting on the conveyor belt is connected on the lifting block through a vertical rod, a connecting frame is fixed on the vertical plate, a guide slide bar is provided in the connecting frame, a sliding hole matching the guide slide bar is provided on the lifting block, and a spring is connected between the connecting frame and the lifting block, an ejection guide groove connected by a one-way spiral segment and a vertical line segment end to end is provided on the outer circumference of the top roller, and a pulley matching the ejection guide groove is provided in the lifting block; The belt conveying device also includes a plurality of belt rollers and a tension adjusting roller, the transmission belt is wound between the belt rollers and the tension adjusting roller, and one of the belt rollers is connected to a driving device.

2. The sludge cake high-efficiency dryer according to claim 1, characterized in that: The tension adjustment roller is connected with a U-shaped frame, and an elastic telescopic component is connected between the U-shaped frame and the inner wall of the drying box.

3. The sludge cake high-efficiency dryer according to claim 1, characterized in that: The upper surface of the drying box is provided with a strip opening perpendicular to the direction of the conveyor belt, the lower end of the feed hopper extends into the interior of the drying box through the strip opening, and the drying box is provided with a pushing cylinder for pushing the feed hopper to move along the direction of the strip opening.

4. The sludge filter cake high-efficiency dryer according to claim 1, characterized in that: A material leveling component for evenly spreading the sludge filter cake on the conveyor belt is arranged inside the drying box near the feed hopper.

5. The sludge filter cake high-efficiency dryer according to claim 1, characterized in that: The hot air device comprises a hot air generator, the hot air generator is connected to a hot air pipe extending into the drying box, the hot air pipe is connected to two exhaust pipes arranged parallel to the direction of the conveyor belt, and the exhaust pipes are provided with air outlets.

6. The sludge cake high-efficiency dryer according to claim 5, characterized in that: Arc-shaped air guide strips are fixed on the inner walls of the drying box located on both sides of the conveyor belt.

7. The sludge filter cake high-efficiency dryer according to claim 1, characterized in that: The air extraction and dehumidification system comprises an air extraction hood arranged on the top of the drying box, the air extraction hood is connected to a drying filter box through an air extraction pipeline, and the drying filter box is connected to an air extraction pump.

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