A method for dewatering and drying sludge

Abstract

The present application relates to sludge dewatering treatment technical field, propose a kind of sludge dewatering dry method, comprising the following steps: S1, sludge is broken and stirred;S2, the broken sludge is transported to negative pressure bin, first input high-temperature gas into negative pressure bin, then the air in negative pressure bin is extracted using vacuum pump;S3, using dewatering device to sludge is dewatered and dried;S4, the sludge after drying is broken.The present application can preheat sludge by inputting high-temperature gas into sludge, improve the dewatering and drying efficiency of sludge, by stirring sludge, and vacuum suction air to sludge, air bubbles in sludge can be removed, so that the smooth operation of sludge dewatering and drying operation is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sludge dewatering treatment, and particularly relates to a sludge dewatering and drying method. BACKGROUND

[0002] Sludge dewatering and drying treatment is an important sewage treatment process, which aims to reduce the water content of sludge, thereby reducing its volume and treatment cost, and improving the stability and availability of sludge.

[0003] Sludge drying is usually achieved by using belt filter presses, plate and frame filter presses, disc filters and hydraulic filter presses and other dewatering devices. Common dewatering devices, such as a continuous sludge drying unit and its application method disclosed in the invention patent with the announcement number CN119143355B, use the dewatering device to squeeze out most of the water in the sludge.

[0004] However, during the stirring process of the sludge, there are air bubbles in the sludge. The sludge with air bubbles will reduce the uniformity of sludge dewatering and drying, and reduce the overall effect of sludge dewatering. At the same time, the air bubbles in the sludge will explode under pressure, thereby damaging the dewatering device. SUMMARY

[0005] Therefore, the present application provides a sludge dewatering and drying method, which can eliminate air bubbles in the sludge and ensure the smooth operation of sludge dewatering and drying.

[0006] The technical scheme of the present application is as follows: the present application provides a sludge dewatering and drying method, which comprises the following steps:

[0007] S1, crushing and stirring the sludge;

[0008] S2, conveying the crushed sludge into a negative pressure bin, first inputting high-temperature gas into the negative pressure bin, and then using a vacuum pump to extract air in the negative pressure bin;

[0009] S3, using a dewatering device to dewater and dry the sludge;

[0010] S4, crushing the dried sludge.

[0011] On the basis of the above technical scheme, preferably, the dewatering device comprises a rack, a plurality of filter frames, a driving device, a traction cable and a scraper, wherein the plurality of filter frames are slidingly arranged on the rack and arranged in parallel; the driving device is fixedly arranged on the rack and located at the filter frames at both ends of the rack; the traction cable is inserted into one of the filter frames at both ends thereof, and the middle position of the traction cable is connected with another filter frame; the scraper is fixedly arranged between the two ends of the traction cable, and the scraper, the traction cable and the filter frame correspond to each other.

[0012] Further preferably, the filter frame comprises a frame body, two penetrating pipes and a traction seat, wherein one side of the frame body is provided with a filter cavity, and the scraper is arranged in the filter cavity; the penetrating pipes are fixedly arranged at the top side of the filter frame, and the traction cable is slidingly arranged in the penetrating pipes; the traction seat is fixedly arranged on the outside of the frame body, and the traction seat in one filter frame is connected with the traction cable on another filter frame.

[0013] Further preferably, the filter frame further comprises a fixing seat, which is fixedly arranged on the outside of the frame body, and the fixing seat and the traction seat are both provided with a plurality of fixing seats and traction seats, which are alternately arranged and slidingly connected with the traction cable.

[0014] Further preferably, the penetrating pipe is arranged in a vertical manner, the circumferential side of the penetrating pipe is arranged in a spaced manner with the side wall in the filter cavity, and the lower end of the penetrating pipe is located below the top side in the filter cavity; when the scraper is driven upward by the traction cable and abuts against the penetrating pipe, the scraper is arranged in a spaced manner with the top side in the filter cavity.

[0015] Further preferably, one end of the penetrating pipe in the filter cavity is provided with a rolled edge portion, the cross section of the rolled edge portion is C-shaped; the circumferential side of the rolled edge portion abuts against the top side in the filter cavity, and the end of the rolled edge portion away from the penetrating pipe abuts against the circumferential side of the penetrating pipe; the penetrating pipe is in a tapered pipe structure, and the inner diameter of the end of the penetrating pipe close to the filter cavity is smaller than the inner diameter of the end of the penetrating pipe away from the filter cavity.

[0016] On the basis of the above technical scheme, preferably, the filter frame is provided with a filter cavity on the side away from the driving device, two opposite side walls in the filter cavity are provided with sliding grooves, and the side of the sliding groove close to the driving device is flush with the side of the filter cavity close to the driving device; the scraper is located in the filter cavity, and the two ends of the scraper are arranged in the sliding grooves.

[0017] Further preferably, the length of the end of the scraper along the filter frame moving direction is H1, the length of the middle position of the scraper along the filter frame moving direction is H2, and the length of the inner side of the sliding groove along the filter frame moving direction is H3, wherein H1 < H3 < H2; the axis of the end of the traction cable is located on the side of the gravity center of the scraper away from the driving device.

[0018] Further preferably, the top side and the bottom side of the scraper are both in the shape of an inclined plane; when the scraper is moved upward by the traction cable, the end of the top side of the scraper close to the driving device is located above the end of the top side of the scraper away from the driving device; when the scraper is moved downward, the end of the bottom side of the scraper close to the driving device is located below the end of the bottom side of the scraper away from the driving device.

[0019] Further preferably, the top end of the side of the scraper close to the driving device is in the shape of a wavy line.

[0020] The sludge dewatering and drying method of the present application has the following beneficial effects over the prior art:

[0021] (1) By inputting high-temperature gas into the sludge, the sludge can be preheated and warmed up, and the dewatering and drying efficiency of the sludge can be improved; by stirring the sludge and vacuum suction of the sludge, the gas bubbles in the sludge can be removed, thereby ensuring the smooth operation of the sludge dewatering and drying operation.

[0022] (2) By passing the two ends of the traction cable into the filter frame and fixedly connecting the two ends of the traction cable with the scraper, and connecting the middle position of the traction cable with another filter frame, when one of the filter frames is moved by the driving device, not only the quick separation of multiple filter frames can be realized, but also the filter cake on the surface of the filter frame can be scraped synchronously, thereby improving the dewatering and drying efficiency of the sludge.

[0023] (3) By setting multiple traction seats and multiple fixed seats, the multiple traction seats and the multiple fixed seats are alternately arranged, and the traction cable is slidably connected with the multiple traction seats and the multiple fixed seats, not only the separation distance between adjacent two filter frames can be reduced, and the occupied space of the device can be reduced, but also the recovery span of the filter cake can be reduced, and the dewatering and drying efficiency of the sludge can be further improved.

[0024] (4) By setting the sliding groove, the moving stability of the scraper can be improved, and by limiting the specifications of the scraper and the sliding groove, the cleaning effect of the scraper can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only need to be some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0026] Figure 1 It is a perspective view of a dewatering device in a sludge dewatering and drying method of the present application.

[0027] Figure 2 It is Figure 1 It is an enlarged view of A in FIG. 6.

[0028] Figure 3 It is a perspective view of a filter frame in a sludge dewatering and drying method of the present application.

[0029] Figure 4 It is a sectional view of the filter frame in a sludge dewatering and drying method of the present application.

[0030] Figure 5 It is a perspective view of a fixing seat in a sludge dewatering and drying method of the present application.

[0031] Figure 6 It is a front view of a dewatering device in a sludge dewatering and drying method of the present application.

[0032] Figure 7 It is a perspective view of an end of a scraper in a sludge dewatering and drying method of the present application.

[0033] Figure 8 It is a sectional view of a chute in a sludge dewatering and drying method of the present application.

[0034] Figure 9 It is a sectional view of a scraper in a sludge dewatering and drying method of the present application when the dewatering device is in a state that the scraper moves upward.

[0035] Figure 10 It is a sectional view of a scraper in a sludge dewatering and drying method of the present application when the dewatering device is in a state that the scraper moves downward.

[0036] Figure 11 It is a sectional view of an end of a scraper in a sludge dewatering and drying method of the present application.

[0037] Figure 12 It is a sectional view of a pipe penetrating part in a sludge dewatering and drying method of the present application.

[0038] Figure 13 It is a perspective view of a driving device in a sludge dewatering and drying method of the present application.

[0039] 1, rack; 2, filter frame; 21, frame body; 22, pipe; 23, traction seat; 24, fixing seat; 201, filter cavity; 202, sliding groove; 203, edge curling part; 3, driving device; 4, traction cable; 5, scraper. DETAILED DESCRIPTION

[0040] The technical solutions in the present application will be clearly and completely described below in combination with the specific embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0041] With the acceleration of urbanization and the rapid development of industry, the amount of sewage treatment is increasing, and the production of sludge as a byproduct of sewage treatment process is also increasing rapidly. Every 10,000 cubic meters of sewage treated by a municipal sewage treatment plant will produce about 5-10 tons of sludge with a water content of about 80%.

[0042] The sludge not only contains a large amount of water, but also contains various harmful substances, such as heavy metals (mercury, cadmium, lead, etc.), pathogenic bacteria (escherichia coli, salmonella, etc.), parasite eggs and difficult-to-degrade organic pollutants, etc. If these sludge is directly discharged or disposed without effective treatment, it will cause serious harm to the environment. For example, heavy metals in sludge can accumulate in soil, causing soil pollution and affecting the growth and quality of crops; pathogenic bacteria and parasite eggs can spread diseases and threaten human health; organic pollutants entering water bodies will consume dissolved oxygen in water, leading to water quality deterioration and destruction of aquatic ecosystems.

[0043] Dewatering and drying is a link in sludge treatment. Common methods include natural airing, mechanical dewatering and thermal drying. Common mechanical dewatering equipment includes plate and frame filter press, belt filter press and centrifugal dewatering machine, etc. Mechanical dewatering equipment has the advantages of rapid and efficient dewatering, low water content after dewatering and good continuity of large treatment capacity, and is widely used in sludge treatment processes in municipal sewage treatment plants, industrial wastewater treatment facilities and other sludge producing places.

[0044] The sludge dewatering and drying method of the present application comprises the following steps: S1, crushing and stirring the sludge to make the sludge particles uniform and break and disperse the air bubbles in the sludge; S2, conveying the crushed sludge into a negative pressure bin, first inputting high-temperature gas into the negative pressure bin to preheat and warm up the sludge, and then using a vacuum pump to extract air in the negative pressure bin to eliminate air bubbles in the sludge; S3, using a dewatering device to dewater and dry the sludge; S4, crushing the dried sludge and conveying it to a subsequent treatment process.

[0045] In the sludge dewatering and drying method, the bubbles in the sludge are eliminated, so that the uniformity of sludge dewatering and drying and the overall effect of sludge dewatering can be improved, and at the same time, there are no bubbles in the sludge, reducing the damage of the sludge to the dewatering device and prolonging the service life of the sludge dewatering device.

[0046] The plate-and-frame filter press is widely used in occasions requiring high-purity filtration due to its high solid-liquid separation efficiency, high solid content in filter cake, and high clarity of filtrate.

[0047] The surface of the filter frame is prone to filter cake adhesion. In order to achieve rapid removal of filter cake, many cleaning mechanisms have been made in the prior art, such as a continuous sludge drying unit and its application method disclosed in the invention patent with publication number CN119143355B, which sets a winding and unwinding assembly and a mud scraping cable, and moves the mud scraping cable by the winding and unwinding assembly to scrape the filter cake on the surface of the filter frame.

[0048] When using the above technical solution, not only does the driving mechanism need to be controlled to separate or press the multiple filter frames, but also the winding and unwinding assembly needs to be controlled to move the mud scraping cable. The process is relatively complex, and the two operations are independent of each other, which occupies a lot of operation time and reduces the efficiency of sludge dewatering and drying. At the same time, in order to achieve the movement of the mud scraping cable, the winding and unwinding assembly is set to include a bracket, a winding and unwinding roller, a spline shaft, and a motor, etc. structure, which needs to be connected with the filter frame, not only increasing the structural complexity of the plate-and-frame filter press, but also increasing the operation and maintenance cost of the filter press, and increasing the weight of the filter frame, which also increases the difficulty of moving the filter frame.

[0049] Therefore, the dewatering device is set to include a rack 1, a filter frame 2, a driving device 3, a traction cable 4, and a scraper 5. The rack 1, the filter frame 2, and the driving device 3 are existing structures. The rack 1 is the main frame of the plate-and-frame filter press. The filter frame 2 is slidingly arranged on the rack 1. The driving device 3 is fixedly arranged on the rack 1. The filter frame 2 is provided in plurality. The plurality of filter frames 2 are arranged in parallel, as shown in Figure 1 The filter frame 2 at the left end is fixedly arranged on the extension end of the driving device 3. The filter frame 2 at the right end is fixedly arranged on the rack 1. The driving device 3 preferably uses a telescopic driving mechanism such as a hydraulic cylinder. The extension of the output end of the driving device 3 can drive the filter frame 2 to move, so as to separate and press the plurality of filter frames 2.

[0050] The traction cable 4 and the scraper 5 are provided in plurality. The plurality of traction cables 4 and the plurality of scrapers 5 correspond one-to-one to the plurality of filter frames 2, as shown in Figure 4 The scraper 5 is located in the filter frame 2. The two ends of the traction cable 4 pass into the filter frame 2 from the outside of the filter frame 2 and are fixedly arranged at the two ends of the scraper 5. The traction cable 4 is slidingly connected with the filter frame 2 through which it passes. The middle position of the traction cable 4 is connected with another filter frame 2.

[0051] In order to realize the linkage stability of the plurality of filter frames 2 and the moving stability of the plurality of scrapers 5, preferably, two filter frames 2 connected with the same traction cable 4 are adjacent, and one traction cable 4 is arranged between each adjacent two filter frames 2.

[0052] The method for using the dewatering device in the application comprises the following steps: S1, turning on the power supply of the driving device 3, using the extension of the output end of the driving device 3 to extrude the plurality of filter frames 2, and pressing the plurality of filter frames 2 together to form a sealed cavity; starting the feed pump on the rack 1 to pass the sludge between the plurality of filter frames 2; the water in the sludge can pass through the filter cloth on the surface of the filter frame 2, while the sludge cannot pass through the filter cloth, so that the water in the sludge is discharged by using the filtering principle, and the water is discharged through the faucet on the filter frame 2 shown in the figure, and the isolated sludge forms a filter cake with a lower water content between the plurality of filter frames 2. Figure 1 S2, using the contraction of the output end of the driving device 3 to drive the filter frame 2 connected therewith away from other filter frames 2; with the increase of the contraction amount of the output end of the driving device 3, and under the traction of the traction cable 4, the plurality of filter frames 2 can be sequentially separated; at the same time, the sliding operation of the traction cable 4 on the filter frame 2 can also drive the scraper 5 to slide upward, so as to scrape the filter cake adhering to the surface of the filter frame 2 by using the scraper 5, and realize the cleaning of the filter frame 2.

[0053] In the above steps, only one reciprocating movement of the output end of the driving device 3 is required, so as to realize the dewatering and drying operation of the sludge, the separation operation of the plurality of filter frames 2, and the cleaning operation of the filter frame 2, greatly simplifying the operation process of the sludge dewatering operation, and improving the processing efficiency of the sludge dewatering and drying.

[0054] In the contraction process of the output end of the driving device 3, each traction cable 4 is sequentially tightened, only the scraper 5 in the filter frame 2 subjected to the separation operation can move upward, and the scraper 5 in the filter frame 2 not subjected to the separation operation cannot move upward, so as to avoid the movement of the scraper 5 in the filter frames 2 pressed together, and the protection of the scraper 5 and the filter frame 2.

[0055] When the output end of the driving device 3 is contracted, the plurality of filter frames 2 are sequentially separated, rather than being collectively and uniformly separated, that is, in the above steps, the plurality of scrapers 5 clean the filter frames 2 sequentially, rather than cleaning together, so that the filter cake gradually falls off rather than falling off collectively, which can effectively alleviate the burden of the filter cake recovery device.

[0056] The filter frame 2 comprises a frame body 21, two penetrating pipes 22, a traction seat 23, and a fixing seat 24, as shown in the figure. Figures 2-4As shown, one side of the frame 21 is provided with a filter cavity 201, and the scraper 5 is arranged in the filter cavity 201. The penetrating pipe 22 penetrates the top side of the filter frame 2. Two penetrating pipes 22 are arranged opposite to the center line of the filter frame 2. The two ends of the traction cable 4 are respectively arranged in the two penetrating pipes 22. The traction seat 23 is fixedly arranged on the outer side of the frame 21. The traction seat 23 in one filter frame 2 is connected with the traction cable 4 penetrating the other filter frame 2. Figure 2 As shown, when the driving device 3 drives the filter frame 2 to move to the left, the traction cable 4 in the penetrating pipe 22 of the filter frame 2 is first caused to slide, thereby driving the scraper 5 to rise, realizing the separation and cleaning effect of the filter frame 2. When the scraper 5 moves to the top end, the traction cable 4 slides to the limit, thereby driving the other filter frame 2 connected with the traction cable 4 to move to the left. In this way, the movement of all filter frames 2 is realized, and the separation and cleaning operation of each filter frame 2 is realized.

[0057] As shown, Figure 2 The fixed seat 24 is fixedly arranged on the outer side of the frame 21. The fixed seat 24 and the traction seat 23 are both provided with a plurality of fixed seats 24 and a plurality of traction seats 23. The plurality of fixed seats 24 and the plurality of traction seats 23 are alternately arranged and are both in sliding connection with the traction cable 4. The fixed seat 24 penetrating the frame 21 and the traction seat 23 penetrating the other frame 21 are in sliding connection with the same traction cable 4, as shown, Figure 5 When two adjacent filter frames 2 are separated, the plurality of fixed seats 24 and the plurality of traction seats 23 can pull the traction cable 4 to form a zigzag shape. Assuming that there are four traction seats 23 and three fixed seats 24, the maximum sliding distance of the scraper 5 in the filter cavity 201 is X, and the maximum separation distance of two adjacent filter frames 2 can be considered to be approximately equal to X / 8. It can be seen that the structure greatly reduces the maximum separation distance of the filter frame 2. The shortening of the separation distance of the filter frame 2 not only reduces the driving burden of the driving device 3 and reduces the occupied space of the plate-and-frame filter, but also reduces the falling range of the filter cake and reduces the recovery burden of the filter cake recovery device.

[0058] As shown, Figure 12 The penetrating pipe 22 is arranged in the vertical direction. The circumferential side of the penetrating pipe 22 is arranged in a spaced manner with the side wall in the filter cavity 201, thereby avoiding the interference between the traction cable 4 in the penetrating pipe 22 and the inner wall of the filter cavity 201. The lower end of the penetrating pipe 22 is located below the top side of the filter cavity 201. When the traction cable 4 drives the scraper 5 to move upward, the scraper 5 can abut against the penetrating pipe 22. When the scraper 5 abuts against the penetrating pipe 22, the scraper 5 is arranged in a spaced manner with the top side in the filter cavity 201, thereby avoiding the extrusion damage of the scraper 5 to the frame 21 and ensuring the safe operation of the plate-and-frame filter.

[0059] As shown, Figure 12As shown, when installing the penetrating pipe 22, a corresponding mounting hole is first formed on the frame 21, and then the penetrating pipe 22 is penetrated into the mounting hole, and the two ends of the penetrating pipe 22 are turned up to realize the fixed connection of the penetrating pipe 22 and the frame 21; the turned-up position of the penetrating pipe 22 at one end in the filter cavity 201 is a crimped portion 203, the cross section of the crimped portion 203 is C-shaped, one end of the crimped portion 203 is integrally formed with the penetrating pipe 22, the circumferential side of the crimped portion 203 abuts against the top side in the filter cavity 201, the end of the crimped portion 203 away from the penetrating pipe 22 abuts against the circumferential side of the penetrating pipe 22, the penetrating pipe 22 is made of metal material, the crimped portion 203 has a certain toughness, and the crimped portion 203 can not only strengthen the connection firmness of the penetrating pipe 22 and the frame 21, but also buffer the impact of the scraper 5 and disperse the impact force generated by the scraper 5 when moving.

[0060] Preferably, the penetrating pipe 22 is provided in a conical pipe structure, the inner diameter of the penetrating pipe 22 near one end of the filter cavity 201 is smaller than the inner diameter of the penetrating pipe 22 away from one end of the filter cavity 201, so as to improve the sealing performance of the penetrating pipe 22 near one end of the filter cavity 201 and the traction cable 4, and avoid the sludge flowing into the penetrating pipe 22; and the inner diameter of the penetrating pipe 22 at one end outside the filter cavity 201 is larger, which can not only facilitate the end of the traction cable 4 to be penetrated into the penetrating pipe 22, but also reduce the contact area of the penetrating pipe 22 and the traction cable 4, so as to prolong the service life of the traction cable 4.

[0061] As shown in the figure, Figure 12 the lower end of the crimped portion 203 and the lower end of the penetrating pipe 22 form a sharp structure, which can guide and disperse the sludge, so that the sludge is as far away as possible from the gap between the penetrating pipe 22 and the traction cable 4.

[0062] Preferably, the filter cavity 201 is formed on the filter frame 2 away from the driving device 3, which is helpful for separating the sludge in the filter cavity 201 from the filter frame 2 by using the principle of inertia when the driving device 3 drives the filter frame 2 to move instantaneously. The filter cavity 201 can also be formed on the other side of the filter frame 2, but the depth thereof should be relatively shallow.

[0063] As shown in the figure, Figure 11 two opposite side walls in the filter cavity 201 are provided with a sliding groove 202, and the side of the sliding groove 202 near the driving device 3 is flush with the side of the filter cavity 201 near the driving device 3; the scraper 5 is located in the filter cavity 201, and the two ends of the scraper 5 are arranged in the sliding groove 202, so that when the scraper 5 moves up and down, the sliding groove 202 can limit the scraper 5, thereby avoiding a large gap between the scraper 5 and the filter frame 2, and thus ensuring the cleaning effect of the scraper 5.

[0064] As shown in the figure, Figure 11As shown, assuming the length of the end of the scraper 5 along the moving direction of the filter frame 2 is H1, the length of the middle position of the scraper 5 along the moving direction of the filter frame 2 is H2, and the length of the inner wall of the sliding groove 202 along the moving direction of the filter frame 2 is H3, then H1 < H3 < H2, by using the size limitation, when the scraper 5 moves, the distance between the scraper 5 and the filter frame 2 can change, thereby avoiding the impurities such as sand and stone from entering between the scraper 5 and the filter frame 2 to damage the filter cloth on the surface of the filter frame 2; at the same time, during the movement of the scraper 5, by using the design of the larger specification of the middle position of the scraper 5, the scraper 5 can also be prevented from being skewed, so as to ensure the stable lifting movement of the scraper 5.

[0065] As shown in the drawings, Figure 8 Preferably, the axis of the end of the traction cable 4 is located on the side of the gravity center of the scraper 5 away from the driving device 3, that is, when the traction cable 4 pulls the scraper 5 upward, the scraper 5 will be close to the inner wall of the filter cavity 201, so as to improve the cleaning effect of the scraper 5.

[0066] In order to improve the cleaning effect of the scraper 5, the top side and the bottom side of the scraper 5 can also be designed as inclined surfaces, as shown in the drawings, Figure 8 When the scraper 5 moves up and down, by using the guide of the top side and the bottom side of the scraper 5 to the sludge, the sludge can be quickly separated from the filter cavity 201, and the amount of sludge entering the interval between the scraper 5 and the inner wall of the filter cavity 201 can be reduced.

[0067] Since there is an interval between the end of the scraper 5 and the inner wall of the sliding groove 202, and the gravity center of the end of the traction cable 4 is located on the side of the gravity center of the scraper 5 away from the driving device 3, as shown in the drawings, Figure 9 When the traction cable 4 drives the scraper 5 to move upward, the scraper 5 will rotate to some extent, so that the top end of the scraper 5 is close to the inner wall of the filter cavity 201, and the bottom end of the scraper 5 is separated from the inner wall of the filter cavity 201, thereby reducing the contact area between the scraper 5 and the filter frame 2, and reducing the moving resistance of the scraper 5; at the same time, the side of the scraper 5 away from the driving device 3 will be in contact with the inner wall of the sliding groove 202, and the contact between the two can make the side of the scraper 5 close to the driving device 3 closer to the inner wall of the filter cavity 201, thereby further improving the cleaning ability of the scraper 5.

[0068] When the plurality of filter frames 2 are pressed, the scraper 5 naturally falls under the gravity, as shown in the drawings, Figure 10 Since the gravity center of the combination structure of the end of the traction cable 4 and the scraper 5 is on the right side, the scraper 5 will also rotate during the descending process, so that the bottom end of the scraper 5 is close to the inner wall of the filter cavity 201, and the top end of the scraper 5 is separated from the inner wall of the filter cavity 201, thereby achieving the effect of reducing the resistance and improving the cleaning ability.

[0069] In order to guarantee the guiding effect of the scraper 5 on the sludge, during the upward movement of the scraper 5, the end of the top side of the scraper 5 close to the driving device 3 is located above the end of the top side of the scraper 5 away from the driving device 3; during the downward movement of the scraper 5, the end of the bottom side of the scraper 5 close to the driving device 3 is located below the end of the bottom side of the scraper 5 away from the driving device 3.

[0070] In order to reduce the resistance during the upward movement of the scraper 5 and better guide the sludge to separate from the filter cavity 201, the top end of the scraper 5 can be partially convex, as shown in Figure 5 and Figure 7 Preferably, the top end of the side of the scraper 5 close to the driving device 3 is in a wavy line shape, so as to improve the sludge dewatering and drying efficiency.

[0071] As shown in Figure 6 When the plurality of filter frames 2 are pressed, the traction cable 4 is in a tight state; as shown in Figure 5 When the plurality of filter frames 2 are separated, the traction cable 4 is also in a tight state, so as to reduce the probability of interference between the traction cable 4 and other components, and guarantee the normal operation of the device.

[0072] The above only describes the preferred embodiments of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for dewatering and drying sludge, characterized in that, The method comprises the following steps: S1, crushing and stirring the sludge; S2, conveying the crushed sludge into a negative pressure bin, first inputting high-temperature gas into the negative pressure bin, and then using a vacuum pump to extract air in the negative pressure bin; S3, using a dewatering device to dewater and dry the sludge; S4, crushing the dried sludge; The dewatering device comprises a rack (1), a plurality of filter frames (2), a driving device (3), a traction cable (4) and a scraper (5), wherein the plurality of filter frames (2) are slidably arranged on the rack (1) and are arranged in parallel; the driving device (3) is fixedly arranged on the rack (1), and the filter frames (2) at both ends of the rack (1) are fixedly arranged on the rack (1) and the output end of the driving device (3) respectively; the two ends of the traction cable (4) penetrate into one of the filter frames (2), and the middle position of the traction cable (4) is connected with the other filter frame (2); the scraper (5) is fixedly arranged between the two ends of the traction cable (4), and the scraper (5), the traction cable (4) and the filter frame (2) correspond one by one. The filter frame (2) comprises a frame body (21), two penetrating pipes (22) and a traction seat (23), wherein one side of the frame body (21) is provided with a filter cavity (201), and the scraper (5) is arranged in the filter cavity (201); the penetrating pipe (22) is fixedly arranged on the top side of the filter frame (2), and the traction cable (4) is slidably arranged in the penetrating pipe (22); the traction seat (23) is fixedly arranged on the outside of the frame body (21), and the traction seat (23) in one filter frame (2) is connected with the traction cable (4) on the other filter frame (2). The penetrating pipe (22) is arranged in a vertical manner, the circumferential side of the penetrating pipe (22) is arranged in a spaced manner with the side wall in the filter cavity (201), and the lower end of the penetrating pipe (22) is below the top side in the filter cavity (201); when the scraper (5) is driven by the traction cable (4) to move upward and the scraper (5) abuts against the penetrating pipe (22), the scraper (5) is arranged in a spaced manner with the top side in the filter cavity (201); One end of the penetrating pipe (22) in the filter cavity (201) is provided with a curled edge portion (203), and the cross section of the curled edge portion (203) is C-shaped; the circumferential side of the curled edge portion (203) abuts against the top side in the filter cavity (201), and the end of the curled edge portion (203) away from the penetrating pipe (22) abuts against the circumferential side of the penetrating pipe (22); the penetrating pipe (22) is a tapered pipe structure, and the inner diameter of the end close to the filter cavity (201) is smaller than the inner diameter of the end away from the filter cavity (201).

2. A method of dewatering and drying sludge as claimed in claim 1, characterized in that: The filter frame (2) further comprises a fixing seat (24), which is fixedly arranged on the outside of the frame body (21), and the fixing seat (24) and the traction seat (23) are provided with a plurality of fixing seats (24) and a plurality of traction seats (23), which are arranged alternately and are slidably connected with the traction cable (4).

3. A method of dewatering and drying sludge as claimed in claim 1, wherein: The filter frame (2) is provided with a filter cavity (201) on the side away from the driving device (3), two opposite side walls in the filter cavity (201) are provided with a sliding groove (202), and the side of the sliding groove (202) close to the driving device (3) is flush with the side of the filter cavity (201) close to the driving device (3). The scraper (5) is located in the filter cavity (201), and both ends of the scraper (5) are arranged in the sliding groove (202).

4. A method of dewatering and drying sludge as claimed in claim 3, characterised in that: The length of the end of the scraper (5) along the moving direction of the filter frame (2) is H1, the length of the middle position of the scraper (5) along the moving direction of the filter frame (2) is H2, and the length of the sliding groove (202) along the moving direction of the filter frame (2) is H3, wherein H1 The axis of the end of the traction cable (4) is located on the side of the gravity center of the scraper (5) away from the driving device (3).

5. A method of dewatering and drying sludge as claimed in claim 4, characterised in that: The top side and the bottom side of the scraper (5) are both inclined; When the traction cable (4) drives the scraper (5) to move upward, the end of the top side of the scraper (5) close to the driving device (3) is located above the end of the top side of the scraper (5) away from the driving device (3); When the scraper (5) moves downward, the end of the bottom side of the scraper (5) close to the driving device (3) is located below the end of the bottom side of the scraper (5) away from the driving device (3).

6. A method of dewatering and drying sludge as claimed in claim 5, characterised in that: The top end of the side of the scraper (5) close to the driving device (3) is in a wavy line shape.

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