Sludge dewatering and drying apparatus and process

Abstract

The present application relates to sludge treatment technical field, especially in kind of sludge's dry dehydration equipment and dehydration process, a kind of sludge's dry dehydration equipment including rack, drying cylinder, screening cylinder, first belt conveyor, crushing assembly and hot air conveying component, drying cylinder is arranged on rack, screening cylinder is arranged at the bottom of drying cylinder.The present application is provided with screening cylinder, crushing assembly and hot air conveying component, since the diameter of the screening hole opened on the circumferential wall of screening cylinder increases from bottom to top, therefore the relatively dry sludge block of large particle size is discharged from the screening hole in the upper part of screening cylinder, the relatively moist sludge block of small particle size is discharged from the screening hole in the lower part of screening cylinder, so under the action of hot air blown upward by hot air conveying component, the sludge block of high humidity is fast in drying speed due to its small particle size, and the sludge block of low humidity is slow in drying speed due to its large particle size, so it is beneficial to improve the humidity uniformity of dried material.

Description

Technical Field

[0001] This invention relates to the field of sludge treatment technology, and in particular to a sludge drying and dewatering equipment and dewatering process. Background Technology

[0002] Sludge drying and dewatering equipment is used in municipal sewage treatment plants, industrial wastewater treatment stations, solid waste disposal centers, etc., to reduce the water content of sludge and reduce its volume.

[0003] When the moisture content of sludge needs to be reduced to below 30%, thermal drying equipment is required. Its core principle is to evaporate the moisture in the sludge using hot air, and then separate the water vapor through condensation or exhaust. The working process of commonly used thermal drying equipment is as follows: First, sludge with a moisture content of around 30% is transported to the upper part of the crushing cylinder. Simultaneously, hot air is blown in from the lower part of the crushing cylinder, coming into counter-current contact with the sludge inside. At the same time, lifters located at the bottom of the crushing cylinder continuously lift and scatter the falling sludge, increasing the contact area between the sludge and the hot air. In addition, the lifters also chop the sludge, reducing its volume. Finally, the moisture in the sludge is evaporated by the hot air, forming "dry sludge blocks" (generally with a moisture content between 20% and 30%). The dry sludge blocks are directionally moved by the hot air into a collection device, where they are collected. The hot air is then treated before being discharged.

[0004] Because the dehydrated sludge blocks are large in volume, during the drying process, the outside is relatively dry while the inside is relatively moist. This means that after the sludge blocks are broken up, some sludge particles are on the outside of the block and are relatively dry, while other sludge particles are on the inside of the block and are relatively moist. When drying the whole block, it is easy for the sludge particles to dry to an uneven degree. Some sludge blocks are not dried to the required moisture content, while others are too dry and turn into powder. Summary of the Invention

[0005] Therefore, it is necessary to provide a sludge drying and dewatering equipment and process to address the problems existing in current sludge drying equipment, in order to solve the problem of uneven moisture content of sludge blocks during the sludge dewatering and drying process.

[0006] The above objectives are achieved through the following technical solutions:

[0007] A sludge drying and dewatering device, comprising:

[0008] frame;

[0009] The drying cylinder is mounted on the frame.

[0010] The screening cylinder is located at the bottom of the drying cylinder. The screening cylinder is conical, with its upper diameter being larger than its lower diameter. Several screening holes are evenly distributed on the outside of the screening cylinder, and the diameter of the screening holes increases from bottom to top along the generatrix of the screening cylinder.

[0011] The first belt conveyor is mounted on the frame and connected to the drying drum, used to transport sludge to the top of the screening drum;

[0012] The crushing component, located at the bottom of the screening cylinder, is used to crush the sludge that falls into the screening cylinder and to lift the crushed sludge upwards.

[0013] Hot air delivery assembly for delivering hot air to the bottom of the drying cylinder.

[0014] Preferably, the crushing assembly includes a rotating spindle, a cutter disc, and cutter plates. The rotating spindle is rotatably mounted on the frame, the cutter disc is located inside the screening cylinder, and the cutter disc is coaxially and fixedly connected to the rotating spindle. There are multiple cutter plates, which are circumferentially and equally spaced on the cutter disc, and the straight line along the length direction of the cutter plates is set at an angle to the axis of the rotating spindle.

[0015] Preferably, the hot air conveying assembly includes a heating fan, an air supply chamber, a first vortex cylinder, an air inlet pipe, a filter air box, and an air inlet box. The heating fan is mounted on the frame, the first vortex cylinder is located outside the drying cylinder, and the outlet of the first vortex cylinder is connected to the drying cylinder. One end of the air supply chamber is connected to the air outlet of the heating fan, and the other end of the air supply chamber is connected to the inlet of the first vortex cylinder. The air inlet pipe is connected to the air inlet of the heating fan. The filter air box is mounted on the frame, the air outlet of the filter air box is connected to the end of the air inlet pipe away from the heating fan, and the air inlet of the filter air box is connected to the air inlet box.

[0016] Preferably, the air inlet pipe is also connected to a water removal cylinder.

[0017] Preferably, the sludge drying and dewatering equipment further includes a discharge assembly, which includes a second vortex drum, a discharge pipe, a cyclone dust collector, and a second belt conveyor. The second vortex drum is mounted on the frame, and its inlet is connected to the top of the drying drum. The discharge pipe is connected to the outlet of the second vortex drum. The cyclone dust collector is vertically mounted on the frame, and its inlet is connected to the end of the discharge pipe away from the second vortex drum. The second belt conveyor is located at the bottom of the frame and is used to receive the material discharged from the outlet of the cyclone dust collector.

[0018] Preferably, a mixing pipe is connected between the top center of the cyclone dust collector and the air inlet pipe.

[0019] Preferably, an adjustable air supply component is provided between the air supply chamber and the screening cylinder. The adjustable air supply component is used to supply hot air, and the air supply volume of the adjustable air supply component is positively correlated with the humidity of the material in the screening cylinder.

[0020] Preferably, the adjustable air supply assembly includes a first air supply branch pipe, a conical adjusting pipe, a conical adjusting block, a second air supply branch pipe, a humidity sensor, and a drive unit. One end of the first air supply branch pipe is connected to the air supply chamber, the small end of the conical adjusting pipe is connected to the end of the first air supply branch pipe away from the air supply chamber, the conical adjusting block is slidably connected inside the conical adjusting pipe, the drive unit is disposed outside the conical adjusting pipe and is connected to the conical adjusting block, the humidity sensor is disposed inside the screening cylinder for detecting the air humidity inside the screening cylinder, the humidity sensor is signal-connected to the drive unit, one end of the second air supply branch pipe is connected to the large end of the conical adjusting pipe, and the other end of the second air supply branch pipe is connected to the screening cylinder.

[0021] Preferably, the cutter head has multiple air supply holes that extend into the screening cylinder, and the rotating main shaft has air guide holes that connect the two ends of the air guide holes to the air supply holes and the second air supply branch pipe, respectively.

[0022] A sludge drying and dewatering process using the aforementioned sludge drying and dewatering equipment.

[0023] The beneficial effects of this invention are:

[0024] This invention comprises a screening cylinder, a crushing component, and a hot air conveying component. The crushing component lifts the crushed sludge blocks upwards until they contact the circumferential wall of the screening cylinder. Since the diameter of the screening holes on the circumferential wall of the screening cylinder increases from bottom to top, the relatively dry sludge blocks with larger particle sizes are discharged from the screening holes at the top of the screening cylinder, while the relatively moist sludge blocks with smaller particle sizes are discharged from the screening holes at the bottom of the screening cylinder. Thus, under the action of the hot air blown upwards by the hot air conveying component, the sludge blocks with high moisture content dry quickly due to their small particle size, while the sludge blocks with low moisture content dry slowly due to their large particle size. This helps to improve the moisture uniformity of the dried material, resulting in better moisture uniformity of the dried sludge blocks. Attached Figure Description

[0025] Figure 1 This is an overall schematic diagram of a sludge drying and dewatering device according to the present invention.

[0026] Figure 2 for Figure 1 A magnified schematic diagram of the structure at point A in the middle;

[0027] Figure 3 for Figure 1 The front view;

[0028] Figure 4 for Figure 3 BB section view;

[0029] Figure 5 for Figure 4 A magnified schematic diagram of the structure at point D;

[0030] Figure 6 for Figure 4 A magnified schematic diagram of the structure at point E in the middle;

[0031] Figure 7 for Figure 3 CC section view;

[0032] Figure 8 for Figure 1 Top view;

[0033] Figure 9 This is a schematic diagram of the crushing component in a sludge drying and dewatering device according to the present invention.

[0034] in:

[0035] 100. Rack;

[0036] 200. Drying cylinder;

[0037] 300. Screening cylinder; 310. Screening holes;

[0038] 400. The first belt conveyor;

[0039] 500. Crushing assembly; 510. Rotary spindle; 520. Cutter head; 530. Cutter plate;

[0040] 600. Hot air conveying assembly; 610. Heating fan; 620. Air supply chamber; 630. First vortex tube; 640. Air inlet pipe; 650. Filter box; 660. Air inlet box; 670. Dewatering cylinder;

[0041] 700. Discharge assembly; 710. Second vortex drum; 720. Discharge pipe; 730. Cyclone dust collector; 740. Second belt conveyor; 750. Mixing pipe;

[0042] 800 Adjustable air supply assembly; 810 First air supply branch pipe; 820 Conical regulating pipe; 830 Conical regulating block; 840 Second air supply branch pipe; 850 Drive unit;

[0043] 910, air inlet; 920, air outlet. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0045] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0047] like Figures 1 to 9 As shown, a sludge drying and dewatering device includes a frame 100, a drying cylinder 200, a screening cylinder 300, a first belt conveyor 400, a crushing assembly 500, and a hot air conveying assembly 600. The drying cylinder 200 is mounted on the frame 100, and the screening cylinder 300 is located at the bottom of the drying cylinder 200. The screening cylinder 300 is conical, with its upper diameter larger than its lower diameter. A plurality of screening holes 310 are evenly distributed on the exterior of the screening cylinder 300. The diameter of 10 increases from bottom to top along the generatrix of the screening cylinder 300. The first belt conveyor 400 is mounted on the frame 100 and connected to the drying cylinder 200 to transport sludge to the top of the screening cylinder 300. The crushing assembly 500 is located at the bottom of the screening cylinder 300 to scoop up the falling sludge and to crush the sludge falling into the screening cylinder 300. The hot air conveying assembly 600 is used to convey hot air to the bottom of the drying cylinder 200.

[0048] In operation, workers feed the pre-dehydrated sludge to the feed end of the first belt conveyor 400. The sludge moves from the feed end to the discharge end as the conveyor 400 operates, falling from above the screening cylinder 300. Once inside the crushing component 500, the component breaks down the sludge lumps and scoops them up. During this process, sludge lumps with high moisture content settle faster due to their higher density, resulting in more sludge being lifted. The sludge particles come into contact with the screening holes 310 at the bottom of the screening cylinder 300. At this point, sludge particles smaller than the aperture of the screening holes 310 at the bottom of the screening cylinder 300 will pass through these screening holes 310 and enter the interlayer area between the drying cylinder 200 and the screening cylinder 300. Sludge particles larger than the aperture of the screening holes 310 at the bottom of the screening cylinder 300 will remain inside the screening cylinder 300 and be further crushed and lifted upwards by the crushing component 500. When the sludge particles are crushed to a size smaller than the aperture of the screening holes 310 at the bottom of the screening cylinder 300, the sludge... Particles pass through the screening holes 310 and enter the interlayer between the drying cylinder 200 and the screening cylinder 300. For sludge lumps with low moisture content, due to their lower density and slower settling, they will have more contact with the screening holes 310 at the top of the screening cylinder 300. Since the aperture of the screening holes 310 at the top of the screening cylinder 300 is larger than that at the bottom, the sludge particles passing through the screening holes 310 at the top of the screening cylinder 300 are larger than those passing through the screening holes 310 at the bottom. In summary, under the screening action of the sieve hole 310, sludge lumps with larger particle size and lower moisture content, as well as sludge lumps with smaller particle size and higher moisture content, enter the interlayer between the drying cylinder 200 and the sieve cylinder 300. Under the action of the hot air blown upward by the hot air conveying assembly 600, the sludge lumps with higher moisture content dry faster due to their smaller particle size, while the sludge lumps with lower moisture content dry slower due to their larger particle size. This helps to improve the moisture uniformity of the dried material, resulting in better moisture uniformity of the dried sludge lumps. In a further embodiment, such as... Figure 6 and Figure 9 As shown, the crushing assembly 500 includes a rotating spindle 510, a cutter head 520, and cutter plates 530. The rotating spindle 510 is rotatably mounted on the frame 100. A motor is mounted at the bottom of the frame 100, and the output shaft of the motor is coaxially and fixedly connected to the rotating spindle 510. The cutter head 520 is located inside the screening cylinder 300 and is coaxially and fixedly connected to the rotating spindle 510. There are multiple cutter plates 530, which are circumferentially and equally spaced on the cutter head 520. The straight line along the length direction of the cutter plates 530 forms an angle with the axis of the rotating spindle 510.

[0049] During use, the motor is started, and the output shaft of the motor drives the rotating spindle 510 to rotate. The rotating spindle 510 drives the cutter head 520 to rotate, and the cutter head 520 drives multiple cutter plates 530 to rotate. As the multiple cutter plates 530 rotate with the cutter head 520, the cutter plates 530 cut the sludge blocks. Since the straight line along the length of the cutter plate 530 is set at an angle with the axis of the rotating spindle 510, after the shredded sludge blocks come into contact with the cutter plates 530, the cutter plates 530 will apply an upward force to the material blocks, thereby lifting the sludge blocks upward.

[0050] In a further embodiment, such as Figures 1-3 As shown, the hot air conveying assembly 600 includes a heating fan 610, an air supply chamber 620, a first vortex cylinder 630, an air inlet pipe 640, a filter air box 650, and an air inlet box 660. The heating fan 610 is mounted on the frame 100. The first vortex cylinder 630 is located outside the drying cylinder 200, and its outlet is connected to the drying cylinder 200. One end of the air supply chamber 620 is connected to the outlet of the heating fan 610, and the other end is connected to the inlet of the first vortex cylinder 630. The air inlet pipe 640 is connected to the inlet of the heating fan 610. The filter air box 650 is mounted on the frame 100. The outlet of the filter air box 650 is connected to the end of the air inlet pipe 640 away from the heating fan 610, and the inlet of the filter air box 650 is connected to the air inlet box 660.

[0051] In use, the heating fan 610 is started. Under the negative pressure of the heating fan 610, external air enters the filter air box 650 through the air inlet box 660. After being filtered in the filter air box 650, the air enters the heating fan 610 through the air inlet pipe 640. The air is heated in the heating fan 610 and then discharged outward from the air outlet of the heating fan 610 to the air supply chamber 620. The air is then transported to the first vortex cylinder 630 through the air supply chamber 620. After being pressurized in the first vortex cylinder 630, the hot air is discharged from the outlet of the first vortex cylinder 630 to the bottom of the drying cylinder 200, thereby realizing the upward flow of hot air in the drying cylinder 200.

[0052] In a further embodiment, such as Figure 1 As shown, the air inlet pipe 640 is also connected to the water removal cylinder 670.

[0053] The desiccant 670 is used to dry the air entering the air inlet duct 640 and remove moisture from the air.

[0054] In a further embodiment, such as Figure 1 , Figure 3 , Figure 4 and Figure 8As shown, the sludge drying and dewatering equipment also includes a discharge assembly 700, which includes a second vortex drum 710, a discharge pipe 720, a cyclone dust collector 730, and a second belt conveyor 740. The second vortex drum 710 is mounted on the frame 100, and its inlet is connected to the top of the drying drum 200. The discharge pipe 720 is connected to the outlet of the second vortex drum 710. The cyclone dust collector 730 is vertically mounted on the frame 100, and its air inlet is connected to the end of the discharge pipe 720 away from the second vortex drum 710. The second belt conveyor 740 is located at the lower part of the frame 100 and is used to receive the material discharged from the outlet of the cyclone dust collector 730.

[0055] When hot air carrying sludge blocks moves to the upper part of the drying cylinder 200, the hot air and sludge blocks enter the second vortex cylinder 710. After being pressurized in the second vortex cylinder 710, they enter the discharge pipe 720 and then enter the cyclone dust collector 730. When the hot air and sludge blocks move to the top of the cyclone dust collector 730, they move spirally downward along the circumferential wall of the cyclone dust collector 730 under the driving action of the cyclone dust collector 730 until they are discharged from the bottom of the cyclone dust collector 730 to the feed end of the second belt conveyor 740. Then, the sludge blocks move with the operation of the second belt conveyor 740 to the discharge end of the second belt conveyor 740 and are discharged from the discharge end of the second belt conveyor 740 to the designated collection point.

[0056] It should be added that the purpose of the spiral air blown out by the cyclone dust collector 730 is to make the sludge blocks more uniform in moisture content.

[0057] Furthermore, to increase the pressure of the hot air discharged into the discharge pipe 720, a centrifugal fan can be installed inside the second vortex cylinder 710. The rotation of the centrifugal fan can pressurize the hot air to increase the air pressure and prevent sludge blocks from falling into the discharge pipe 720.

[0058] In a further embodiment, such as Figure 1 As shown, a mixing pipe 750 connects the top center of the cyclone dust collector 730 and the air inlet pipe 640.

[0059] After hot air and sludge enter the cyclone dust collector 730, they spiral downwards along the circumferential wall of the cyclone dust collector 730. When the hot air reaches the bottom of the cyclone dust collector 730, it flows upwards from the center of the cyclone dust collector 730. By setting a mixing pipe 750 at the top center of the cyclone dust collector 730, the hot air enters the mixing pipe 750 and then enters the air inlet pipe 640 through the mixing pipe 750, mixing with the air in the air inlet pipe 640 to preheat the air, thereby reducing heat emission and improving thermal energy utilization.

[0060] In a further embodiment, such as Figure 1 , Figure 2 , Figures 4-6 As shown, an adjustable air supply assembly 800 is provided between the air supply chamber 620 and the screening cylinder 300. The adjustable air supply assembly 800 is used to supply hot air, and the air supply volume of the adjustable air supply assembly 800 is positively correlated with the humidity of the material in the screening cylinder 300.

[0061] When sludge lumps are broken up, the more moist parts inside are exposed. If these moist parts come into direct contact with the perimeter of the screening cylinder 300, they easily adhere to the perimeter and clog the screening holes 310. Therefore, an adjustable air supply assembly 800 is installed to pre-dry the sludge lumps, reducing the amount of sludge lumps adhering to the perimeter of the screening cylinder 300. The air supply volume of the adjustable air supply assembly 800 is positively correlated with the moisture content of the material inside the screening cylinder 300. This is because if the moisture content of the current batch of sludge is low, the sludge inside will be more easily exposed after being broken up. The viscosity of the sludge is not very high, and this type of sludge is not easy to stick to the peripheral wall of the screening cylinder 300. However, if hot air is introduced through the adjustable air supply component 800, it will affect the uniformity of the sludge moisture content. Therefore, the amount of hot air introduced through the adjustable air supply component 800 should be reduced to improve the uniformity of sludge moisture content. Conversely, if the moisture content of the current batch of sludge is high, the sludge inside will be more viscous after it is broken up, and it will easily stick to the peripheral wall of the screening cylinder 300. Therefore, the amount of hot air introduced through the adjustable air supply component 800 should be increased to prevent the screening holes 310 from being blocked by sludge.

[0062] In a further embodiment, the adjustable air supply assembly 800 includes a first air supply branch pipe 810, a tapered adjusting pipe 820, a tapered adjusting block 830, a second air supply branch pipe 840, a humidity sensor, and a drive unit 850. One end of the first air supply branch pipe 810 is connected to the air supply chamber 620, and the small end of the tapered adjusting pipe 820 is connected to the end of the first air supply branch pipe 810 away from the air supply chamber 620. The tapered adjusting block 830 is slidably connected inside the tapered adjusting pipe 820. 850 is located outside the conical regulating pipe 820, and the drive unit 850 is connected to the conical regulating block 830 to drive the conical regulating block 830 to move along its axis. The humidity sensor is located inside the screening cylinder 300 to detect the air humidity inside the screening cylinder 300. The humidity sensor is connected to the drive unit 850. One end of the second air supply branch pipe 840 is connected to the large end of the conical regulating pipe 820, and the other end of the second air supply branch pipe 840 is connected to the screening cylinder 300.

[0063] During operation, the hot air in the air supply chamber 620 first enters the first air supply branch pipe 810, then enters the conical regulating pipe 820, and then enters the second air supply branch pipe 840 through the conical regulating pipe 820, and then enters the drying cylinder 200 through the second air supply branch pipe 840. When the humidity sensor detects an increase in the air humidity in the screening cylinder 300, the humidity sensor sends an electrical signal to the drive unit 850, and the drive unit 850 drives the conical regulating block 830 to move to the right. At this time, the conical regulating pipe 820... As the flow cross-section of the conical regulating pipe 820 increases, the amount of hot air entering the second air supply branch pipe 840 through the conical regulating pipe 820 per unit time increases. Conversely, when the humidity sensor detects a decrease in the air humidity inside the sieve cylinder 300, the humidity sensor sends an electrical signal to the drive unit 850. The drive unit 850 drives the conical regulating block 830 to move to the left. At this time, the flow cross-section of the conical regulating pipe 820 decreases, and the amount of hot air entering the second air supply branch pipe 840 through the conical regulating pipe 820 per unit time decreases.

[0064] Furthermore, the drive unit 850 includes a motor, a screw, and a threaded sleeve. The motor is mounted on the frame 100, and the output shaft of the motor is coaxially and fixedly connected to the screw. The threaded sleeve is threadedly connected to the screw, and the other end of the threaded sleeve is coaxially and fixedly connected to the tapered adjusting block 830. At the same time, a limit slider is provided in the circumferential direction of the threaded sleeve. The limit slider extends along the axis of the threaded sleeve and is slidably connected to the tapered adjusting tube 820, so that the threaded sleeve can only move along the axis of the threaded sleeve and cannot rotate under the rotation drive of the screw.

[0065] In a further embodiment, such as Figure 6 As shown, the cutter head 520 has multiple air supply holes 910, which extend into the screening cylinder 300. The rotating main shaft 510 has air guide holes 920, and the two ends of the air guide holes 920 are respectively connected to the air supply holes 910 and the second air supply branch pipe 840. The second air supply branch pipe 840 is rotatably connected to the rotating main shaft 510, and the diameter of the rotating main shaft 510 is slightly larger than the inner diameter of the second air supply branch pipe 840.

[0066] When hot air enters the second air supply branch pipe 840, it enters through the air guide hole 920 on the rotating main shaft 510, then enters the air supply hole 910 through the air guide hole 920, and finally exits outward into the screening cylinder 300 through the air supply hole 910.

[0067] A sludge drying and dewatering process using the aforementioned sludge drying and dewatering equipment.

[0068] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A sludge drying and dewatering device, characterized in that, include: frame; The drying cylinder is mounted on the frame. The screening cylinder is located at the bottom of the drying cylinder. The screening cylinder is conical, with its upper diameter being larger than its lower diameter. Several screening holes are evenly distributed on the outside of the screening cylinder, and the diameter of the screening holes increases from bottom to top along the generatrix of the screening cylinder. The first belt conveyor is mounted on the frame and connected to the drying drum, used to transport sludge to the top of the screening drum; The crushing component, located at the bottom of the screening cylinder, is used to crush the sludge that falls into the screening cylinder and to lift the crushed sludge upwards. Hot air delivery assembly for delivering hot air to the bottom of the drying cylinder.

2. The sludge drying and dewatering equipment according to claim 1, characterized in that, The crushing assembly includes a rotating spindle, a cutter head, and cutter plates. The rotating spindle is rotatably mounted on the frame, the cutter head is located inside the screening cylinder, and the cutter head is coaxially and fixedly connected to the rotating spindle. There are multiple cutter plates, which are evenly spaced around the cutter head, and the line along the length of the cutter plates forms an angle with the axis of the rotating spindle.

3. The sludge drying and dewatering equipment according to claim 2, characterized in that, The hot air conveying assembly includes a heating fan, an air supply chamber, a first vortex cylinder, an air inlet pipe, a filter air box, and an air inlet box. The heating fan is mounted on the frame. The first vortex cylinder is located outside the drying cylinder, and its outlet is connected to the drying cylinder. One end of the air supply chamber is connected to the outlet of the heating fan, and the other end of the air supply chamber is connected to the inlet of the first vortex cylinder. The air inlet pipe is connected to the air inlet of the heating fan. The filter air box is mounted on the frame. The outlet of the filter air box is connected to the end of the air inlet pipe away from the heating fan, and the air inlet of the filter air box is connected to the air inlet box.

4. The sludge drying and dewatering equipment according to claim 3, characterized in that, The air inlet pipe is also connected to a water removal cylinder.

5. The sludge drying and dewatering equipment according to claim 3, characterized in that, The sludge drying and dewatering equipment also includes a discharge assembly, which includes a second vortex drum, a discharge pipe, a cyclone dust collector, and a second belt conveyor. The second vortex drum is mounted on the frame, and its inlet is connected to the top of the drying drum. The discharge pipe is connected to the outlet of the second vortex drum. The cyclone dust collector is vertically mounted on the frame, and its inlet is connected to the end of the discharge pipe away from the second vortex drum. The second belt conveyor is located at the bottom of the frame and is used to receive the material discharged from the outlet of the cyclone dust collector.

6. The sludge drying and dewatering equipment according to claim 5, characterized in that, A mixing pipe connects the top center of the cyclone dust collector and the air inlet pipe.

7. The sludge drying and dewatering equipment according to claim 3, characterized in that, An adjustable air supply component is provided between the air supply chamber and the screening cylinder. The adjustable air supply component is used to supply hot air, and the air supply volume of the adjustable air supply component is positively correlated with the humidity of the material in the screening cylinder.

8. The sludge drying and dewatering equipment according to claim 7, characterized in that, The adjustable air supply assembly includes a first air supply branch pipe, a conical adjusting pipe, a conical adjusting block, a second air supply branch pipe, a humidity sensor, and a drive unit. One end of the first air supply branch pipe is connected to the air supply chamber, and the small end of the conical adjusting pipe is connected to the end of the first air supply branch pipe away from the air supply chamber. The conical adjusting block is slidably connected inside the conical adjusting pipe. The drive unit is located outside the conical adjusting pipe and is connected to the conical adjusting block. The humidity sensor is located inside the screening cylinder and is used to detect the air humidity inside the screening cylinder. The humidity sensor is signal-connected to the drive unit. One end of the second air supply branch pipe is connected to the large end of the conical adjusting pipe, and the other end of the second air supply branch pipe is connected to the screening cylinder.

9. The sludge drying and dewatering equipment according to claim 8, characterized in that, The cutter head has multiple air supply holes that extend into the screening cylinder. The rotating main shaft has air guide holes that connect the two ends of the air guide holes to the air supply holes and the second air supply branch pipe, respectively.

10. A sludge drying and dewatering process, characterized in that, The sludge drying and dewatering equipment according to any one of claims 1-9 was used.

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