Multi-working-area longitudinal squeezing and dewatering system for sludge

Abstract

The invention belongs to the technical field of sludge treatment devices, and particularly discloses a multi-working-area longitudinal squeezing and dewatering system for sludge, which comprises a first working area, a second working area and a third working area, wherein the second working area and the third working area are the same in structure, and the second working area and the third working area are arranged on the two sides of the first working area respectively; the first working area is used for sludge squeezing and dewatering, and the second working area and the third working area are both used for sludge feeding or sludge discharging; when the multi-working-area longitudinally-arranged squeezing and dewatering system works, one circulating working process sequentially comprises an initial sludge feeding working condition, a squeezing-sludge feeding working condition, a sludge discharging-squeezing working condition and a sludge feeding-pressure relief working condition, and free water and part of combined water in sludge are forced to discharge flocs in a longitudinally-arranged high-pressure mechanical squeezing mode; the sludge deep dewatering device is provided with a feeding-squeezing and squeezing-sludge discharging working area, continuous and uninterrupted dewatering operation is achieved, and the dewatering efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of sludge treatment devices, and in particular to a multi-working zone longitudinal squeezing and dewatering system for sludge. Background Art

[0002] Municipal sludge is a byproduct of sewage treatment, with large output, high water content, high organic matter content, and complex characteristics. my country requires the four-step treatment and disposal of municipal sludge, namely, reduction, stabilization, harmlessness, and resource utilization. Reduction refers to reducing the total amount of municipal sludge through specific technologies and equipment, and reduction is the prerequisite for subsequent sludge disposal or resource utilization. The water content of untreated municipal sludge is generally as high as 90% or more. Reducing the water content in the sludge can achieve sludge reduction. However, due to the presence of bound water in the sludge flocs, municipal sludge is difficult to dehydrate and reduce during the treatment process, resulting in a water content of 80% in the sludge transported from sewage plants.

[0003] At present, the industry generally requires that the moisture content of sludge shipped out be reduced to below 60%, and in order to facilitate subsequent resource disposal, the moisture content needs to be further reduced to below 40%, which requires deep dehydration of municipal sludge. Mechanical extrusion dehydration is the main dehydration method for municipal sludge, which has the advantages of high treatment efficiency, energy saving and small footprint. However, a large amount of organic matter in municipal sludge forms a gel-like extracellular polymeric matrix (EPS), causing water to be stored in the EPS matrix. During the filter pressing process, the dehydration channel is easily deformed and blocked, resulting in poor extrusion dehydration effect under low pressure, which restricts the subsequent disposal of the sludge.

[0004] In traditional technology, chemical agents are often used for pretreatment to improve the dewatering performance of sludge, but chemical agents increase the cost of the pretreatment process. The addition of a large amount of chemical agents will reduce the durability of dewatering equipment, have long-term latent negative impacts on the environment and organisms, and limit the resource utilization of dewatered cakes. At present, centrifugal dewatering relies on the centrifuge to provide centrifugal force to drive water out of the sludge flocs. The disadvantage is that the dewatering pressure is low (no more than 2MPa), resulting in poor deep dewatering effect. The sludge water content after centrifugation is still higher than 70%; the plate and frame pressing method relies on the plate and frame pressing filter cloth to form a mud cake dewatering layer. Although the dewatering pressure is relatively high, it cannot be continuously operated for dewatering. The number of mud cake dewatering layers is small (less than 30 to 50 layers), the pressing time is long, and the dewatering efficiency is still low; the drying method uses waste heat to evaporate most of the water in the sludge, which has a good effect, but the energy consumption of drying the sludge from high water content to low water content is generally high. In summary, traditional dehydration equipment and technical methods cannot simultaneously meet key indicators such as high dehydration pressure, a large number of mud cake dehydration layers, continuous operation and low energy consumption. It is generally difficult to take into account both dehydration effect and comprehensive cost. Therefore, it is necessary to develop new dehydration technologies and equipment systems with significant dehydration effects, high efficiency and energy saving. Summary of the invention

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide a vertically mounted high-pressure pressing dewatering system for sludge dewatering, which has multiple working areas, so as to solve the defects of the sludge dewatering equipment such as insignificant dewatering effect, discontinuous working state and high energy consumption.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme:

[0007] A multi-working area longitudinal squeezing and dewatering system for sludge, comprising a first working area, a second working area and a third working area; wherein the second working area and the third working area have the same structure, and the second working area and the third working area are respectively arranged on both sides of the first working area; the first working area is used for squeezing sludge dewatering, and the second working area and the third working area are both used for sludge inlet or outlet;

[0008] When the multi-working zone longitudinal squeezing and dehydration system is in operation, a cyclic working process includes the initial mud feeding condition, squeezing-mud feeding condition, mud discharge-squeezing condition and mud feeding-pressure relief condition in sequence;

[0009] Under the initial mud-injection condition, mud is injected into the second working area, the first working area is maintained, and the third working area is maintained;

[0010] Under the condition of squeezing and mud feeding, the second working area is maintained, the first working area is squeezed and depressurized, and the third working area is mud fed;

[0011] In the mud discharge-squeezing working condition, the second working area discharges mud, the first working area squeezes, and the third working area is maintained;

[0012] Under the mud-injection-pressure relief working condition, mud is injected into the second working area, the first working area is squeezed-pressure relieved, and the third working area is maintained;

[0013] Under the squeezing-mud discharge working condition, the second working area is maintained, the first working area is squeezed, and the third working area is mud discharged.

[0014] Further, the second working area includes a truss, a transverse hydraulic-electric control system, a transverse hydraulic device, a hydraulic push rod, a pad, a mud feeding device and a moving wheel; wherein the truss is provided with a transverse hydraulic-electric control system, a transverse hydraulic device, a hydraulic push rod and a first pad, the transverse hydraulic-electric control system is connected to the transverse hydraulic device, the transverse hydraulic device is connected to the hydraulic push rod, the hydraulic push rod is connected to the first pad, the first pad is connected to the first dehydration chamber, the first dehydration chamber is arranged on the first dehydration chamber moving platform, and the mud feeding device is movably arranged on the upper track of the truss through the moving wheel.

[0015] Furthermore, the mud feeding device is provided with a feeding bin, a lower filter cloth, a first filter cloth traction wheel, a lower filter cloth barrel, a second filter cloth traction wheel, an upper filter cloth, an upper filter cloth barrel, and a third filter cloth traction wheel; and a mud conveying pipe is provided corresponding to the feeding bin;

[0016] When the second working area is fed with mud, the sludge to be dehydrated is pumped into the feed bin through the mud conveying pipe, and the sludge in the feed bin is pumped to the upper surface of the lower filter cloth at a set speed, and the lower filter cloth is brought out of the lower filter cloth barrel by the first filter cloth traction wheel, and the lower filter cloth barrel rotates counterclockwise; the second filter cloth traction wheel brings the upper filter cloth out of the upper filter cloth barrel, and the upper filter cloth barrel rotates clockwise; the upper filter cloth and the lower filter cloth together constitute a double-layer filter cloth of the interlayer sludge to be dehydrated, and the double-layer filter cloth of the interlayer sludge to be dehydrated moves toward the first dehydration chamber under the drive of the third filter cloth traction wheel, and after the overall left and right movement of the mud feeding device, the double-layer filter cloth of the interlayer sludge to be dehydrated is stacked in the first dehydration chamber, wherein the interlayer of the sludge to be dehydrated is 100 to 300 layers, preferably 300 layers, and the thickness of each layer is less than 5 to 10 mm.

[0017] Furthermore, when the mud feeding of the second working area is completed, the transverse hydraulic device in the second working area and the transverse hydraulic device in the third working area are started simultaneously under the control of the corresponding transverse hydraulic electronic control system, the transverse hydraulic device in the second working area increases pressure, and the transverse hydraulic device in the third working area releases pressure, and the hydraulic pushing rod in the second working area pushes the first dehydration chamber moving platform carrying the first dehydration chamber to move toward the first working area, and the first moving platform is supported by a first moving wheel, and the second dehydration chamber set in the first working area and the second dehydration chamber moving platform loading the second dehydration chamber are pushed to move toward the third working area through the second pad, and the second moving platform is supported by a second moving wheel, and the hydraulic pushing rod in the third working area retracts the transverse hydraulic device.

[0018] Further, the first working area includes a pressurizing frame, a longitudinal support column, a longitudinal hydraulic system, a longitudinal pressurizing column, a pressurizing plate and a longitudinal hydraulic electric control system; wherein the longitudinal support column supports the pressurizing frame, the longitudinal hydraulic system is connected to the pressurizing plate through the longitudinal pressurizing column, and the longitudinal hydraulic electric control system is connected to the longitudinal hydraulic system; transverse drainage pipes and longitudinal drainage pipes are arranged in the four outer frames of the first dehydration chamber;

[0019] When the first working area is squeezing and unloading, with the first dehydration chamber located directly below the pressure frame, the longitudinal pressure column and the pressure plate are driven by the longitudinal hydraulic system to apply longitudinal pressure to the double-layer dehydration filter cloth pile containing sludge; the sludge dehydration liquid is discharged from the system through the transverse drainage pipes and the longitudinal drainage pipes arranged in the four outer frames of the first dehydration chamber, and the longitudinal hydraulic system is controlled by the longitudinal hydraulic electronic control system.

[0020] Furthermore, the longitudinal hydraulic electronic control system controls the longitudinal hydraulic system based on a set pressure value, and the set pressure value includes a first value, a second value and a third value. In the pressurization stage, the longitudinal hydraulic electronic control system controls the pressure applied by the longitudinal hydraulic system to increase from 0 to the first value within a unit time, and maintain it for a unit time, then increase from the first value to the second value within a unit time and maintain it for a unit time, and finally increase from the second value to the third value within a unit time, and maintain the third value within a set time, and the third value is 15 to 32 MPa, preferably 32 MPa; in the pressure relief stage, the longitudinal hydraulic electronic control system controls the pressure applied by the longitudinal hydraulic system to decrease from the third value to the second value within a unit time, and maintain it for a unit time, and then decrease from the second value to 0 within a unit time.

[0021] Furthermore, when the squeezing-pressure relief of the first working area is completed and the mud feeding of the third working area is completed, the transverse hydraulic device in the second working area and the transverse hydraulic device in the third working area are started simultaneously under the control of the correspondingly connected transverse hydraulic electric control system, the transverse hydraulic device in the second working area is pressure-relieved, and the transverse hydraulic device in the third working area is pressure-increased, and the hydraulic pushing rod in the third working area pushes the second dehydration chamber moving platform carrying the second dehydration chamber to move toward the first working area, and the first dehydration chamber and the first dehydration chamber moving platform in the first working area are pushed by the second pad. The movable platform moves toward the second working area, the hydraulic push rod of the second working area retracts the horizontal hydraulic device, the mud feeding device switches to the mud discharging state, moves left and right above the truss, and the third filter cloth traction wheel rotates to lead the double-layer filter cloth of the sandwich sludge after squeezing out of the first dewatering chamber; the lower filter cloth barrel rotates clockwise to recycle the lower filter cloth, and the upper filter cloth barrel rotates counterclockwise to recycle the upper filter cloth. The dewatered sludge is scraped off by the filter cloth scraper, sent to the dewatered sludge collecting tank via the dewatered sludge conveyor belt, and pumped out by the screw pump. At this time, the second dewatering chamber located in the first working area is squeezed and unloaded.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] Municipal sludge has complex properties. The extracellular polymers contained in it hinder the smooth discharge of free water and part of the bound water. The thickness of the mud cake formed by the sludge during the dehydration process, the number of mud cake layers and the squeezing pressure are key indicators affecting the dehydration efficiency. The thinner the mud cake thickness, the more mud cake layers and the higher the dehydration squeezing pressure, the higher the dehydration efficiency. The present invention forces the free water and part of the bound water in the sludge to discharge the flocs by vertically placing high-pressure mechanical squeezing. The mud cake thickness is less than 5 to 10 mm, the number of mud cake dehydration layers can reach 100 to 300 layers, and the squeezing pressure can reach up to 15 to 32 MPa, which is higher than the relevant parameter indicators in the traditional dehydration device, and achieves deep dehydration of sludge under energy-saving conditions. It has a dual working area of ​​feed-squeezing and squeezing-mud discharge, can realize continuous and uninterrupted dehydration operation, and greatly improves the dehydration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of system operating conditions of a multi-working zone longitudinal squeezing and dewatering system for sludge provided in an embodiment of the present invention.

[0026] Figure 2 A state diagram of the initial sludge feeding condition of a system of a multi-working zone longitudinal squeezing and dewatering system for sludge provided in an embodiment of the present invention.

[0027] Figure 3 A system pressing-sludge feeding operating state diagram of a multi-working zone longitudinal pressing and dewatering system for sludge provided in an embodiment of the present invention.

[0028] Figure 4 A system mud discharge-squeezing working state diagram of a multi-working zone longitudinal squeezing and dewatering system for sludge provided in an embodiment of the present invention.

[0029] Figure 5 This is a working principle diagram of the longitudinal hydraulic electronic control system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0031] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The present invention will now be further described with reference to the accompanying drawings.

[0034] The embodiment of the present invention provides a multi-working zone longitudinal pressing and dewatering system for sludge to solve the defects of existing sludge dewatering equipment, such as insignificant dewatering effect, discontinuous working state and high energy consumption. In short, the free water and part of the combined water in the sludge are forced to discharge flocs through longitudinal high-pressure mechanical pressing, so as to achieve deep dehydration of the sludge under energy-saving conditions, and has dual working zones of feeding-pressing and pressing-mud discharge, so as to realize continuous and uninterrupted dehydration operation and greatly improve the dehydration efficiency.

[0035] Specifically, see Figure 2 As shown, the multi-working area longitudinal squeezing and dewatering system for sludge includes three working areas, namely the first working area A, the second working area B-1 and the third working area B-2. Among them, the first working area A is a longitudinal high-pressure mechanical squeezing sludge dewatering area. The second working area B-1 and the third working area B-2 have the same structure. According to different system working conditions, the second working area B-1 and the third working area B-2 can respectively serve as the functional areas for feeding or discharging sludge. The second working area B-1 and the third working area B-2 have the same mechanical structure. The first working area A, the second working area B-1 and the third working area B-2 can form different working states to improve the dewatering efficiency of the system.

[0036] The multi-working area longitudinal pressing and dewatering system for sludge is suitable for Figure 1 The technical solution of continuous circulation shown in the figure, the filled box indicates that the first dehydration chamber 6 or the second dehydration chamber 24 is located in the corresponding working area. The system working states are: initial mud feeding condition (mud feeding in the second working area B-1, maintenance in the first working area A, maintenance in the third working area B-2), squeezing-mud feeding condition (maintenance in the second working area B-1, squeezing-pressure relief in the first working area A, mud feeding in the third working area B-2), mud discharge-squeezing condition (mud discharge in the second working area B-1, squeezing in the first working area A, maintenance in the third working area B-2), mud feeding-pressure relief condition (mud feeding in the second working area B-1, squeezing-pressure relief in the first working area A, maintenance in the third working area B-2), squeezing-mud discharge condition (maintenance in the second working area B-1, squeezing in the first working area A, and mud discharge in the third working area B-2), and then enter the squeezing-mud feeding condition again for circulation. The feeding-pressing-pressure relief-mud discharge continuous cycle working condition technical method developed as described above can ensure the high efficiency, energy saving and easy maintenance of the system in deep sludge dehydration.

[0037] The structure and working principle of the system will be described in detail below in combination with the working conditions of each working area.

[0038] The second working area B-1 is mainly composed of a truss 1. Below the truss 1, there are a transverse hydraulic electric control system 2, a transverse hydraulic device 3, a hydraulic push rod 4, a first cushion block 5, a first dehydration chamber 6 and a first dehydration chamber moving platform 7. A mud feeding device 8 is arranged above the truss 1, and the mud feeding device 8 moves left and right on the track of the truss 1 through a moving wheel 9. It should be noted that the third working area B-2 has the same structure as the second working area B-1, so its structure is not repeated here.

[0039] like Figure 2 As shown, the first dehydration chamber 6 of the second working area B-1 is in the mud feeding condition: the mud delivery pipe 10 pumps the sludge to be dehydrated into the feed bin 11, and the sludge in the feed bin 11 is pumped to the upper surface of the lower filter cloth 12 at a set speed, and the lower filter cloth 12 is brought out of the lower filter cloth barrel 14 by the first filter cloth traction wheel 13, and the lower filter cloth barrel 14 rotates counterclockwise. The second filter cloth traction wheel 15 brings the upper filter cloth 16 out of the upper filter cloth barrel 17, and the upper filter cloth barrel 17 rotates clockwise. The upper filter cloth 16 and the lower filter cloth 12 together constitute a double-layer filter cloth 18 for the interlayer sludge to be dehydrated. The double-layer filter cloth 18 for the interlayer sludge to be dehydrated moves toward the first dehydration chamber 6 driven by the third filter cloth traction wheel 19. After the mud feeding device 8 moves left and right as a whole, the double-layer filter cloth 18 for the interlayer sludge to be dehydrated is stacked in the first dehydration chamber 6. The number of stacked layers of dehydrated filter cloth interlayer sludge is 300.

[0040] like Figure 3 As shown, when the mud-feeding condition of the first dewatering chamber 6 of the second working area B-1 is completed: the lateral hydraulic device 3 of the second working area B-1 and the lateral hydraulic device 20 of the third working area B-2 are started simultaneously under the control of the lateral hydraulic electronic control systems 2 and 20 of the second working area B-1 and the third working area B-2, the lateral hydraulic device 3 of the second working area B-1 is pressurized, and the lateral hydraulic device of the third working area B-2 (20) is depressurized, and the first dewatering chamber moving platform 7 carrying the first dewatering chamber 6 is pushed by the hydraulic push rod 4 of the second working area B-1 to move toward the first working area A, and the first moving wheel 22 is arranged under the support of the first moving platform 7, and the original second dewatering chamber 24 and the second dewatering chamber moving platform 25 in the first working area A are pushed to move toward the third working area B-2 through the pad 23, and the second dewatering chamber moving platform 25 is supported by the second moving wheel 26, and the hydraulic push rod 27 of the third working area B-2 retracts to the lateral hydraulic device 20.

[0041] Exemplarily, the longitudinal hydraulic electronic control system controls the longitudinal hydraulic system based on a set pressure value, and the set pressure values ​​include a first value P1, a second value P2 and a third value P3. In the pressurization stage, the longitudinal hydraulic electronic control system controls the pressure applied by the longitudinal hydraulic system to increase from 0 to the first value P1 within a unit time, and maintain it for a unit time, then increase from the first value P1 to the second value P2 within a unit time and maintain it for a unit time, and finally increase from the second value P2P2 to the third value P3 within a unit time, and maintain the third value within a set time, and the third value can reach a maximum of 32MPa; in the depressurization stage, the longitudinal hydraulic electronic control system controls the pressure applied by the longitudinal hydraulic system to decrease from the third value P3 to the second value P2 within a unit time, and maintain it for a unit time, and then decrease from the second value P2 to 0 within a unit time.

[0042] When the first dewatering chamber 6 of the first working area A is in the squeezing-unloading state, the pressure frame 28 of the first working area A is fixed by the (29) longitudinal support column, and the mobile platform carrying the dewatering chamber is located directly below the pressure frame, the longitudinal hydraulic system 30 drives the longitudinal pressure column 31 and the pressure plate 32 to apply longitudinal pressure to the (17) double-layer dewatering filter cloth pile containing sludge. The four outer frames of the first dewatering chamber 6 are arranged with transverse drainage pipes 33 and longitudinal drainage pipes 34. The ends of the longitudinal drainage pipes 34 are connected to water pipes to discharge the sludge dewatering liquid out of the system for treatment. The longitudinal hydraulic system 29 is controlled by the longitudinal hydraulic electric control system 33. The control principle of the longitudinal hydraulic electric control system 33 is as follows: Figure 5 shown. Figure 5 The horizontal axis is time, the vertical axis is pressure, and the optimal longitudinal hydraulic parameters are set. The pressures corresponding to the times T1, T2, T3...Tn, Tn+1, Tn+2 are P1, P2, P3...Pn, Pn+1, Pn+2. The optimal parameters of time and pressure for loading, holding pressure, and unloading are obtained based on the equipment squeezing experiment and debugging. The second dehydration chamber 24 of the third working area B-2 is in the mud feeding condition at this time. The mechanical structure and working principle of the third working area B-2 are consistent with those of the second working area B-1. The second working area B-1 has no dehydration chamber in the maintenance state, and routine inspections and equipment maintenance can be carried out.

[0043] like Figure 4As shown, when the squeezing-pressure relief condition in the first dehydration chamber 6 of the first working area A is completed, and the mud feeding condition in the second dehydration chamber 24 of the third working area B-2 is completed: the transverse hydraulic device 3 of the second working area B-1 and the transverse hydraulic device of the third working area B-2 (20) are started simultaneously under the control of the transverse hydraulic electronic control systems 2 and 21, the transverse hydraulic device 3 of the second working area B-1 is depressurized, and the transverse hydraulic device 20 of the third working area B-2 is pressurized, and the second dehydration chamber moving platform 25 carrying the second dehydration chamber 24 is pushed toward the first working area A by the hydraulic push rod 20 of the third working area B-2, and the original first dehydration chamber 6 and the first dehydration chamber moving platform 7 in the first working area A are pushed toward the second working area B-1 through the pad 23, and the second working area B-1 hydraulic push rod 4 retracts to the transverse hydraulic device 3. The mud inlet device 8 switches to the mud outlet state, moves left and right above the truss 1, and the third filter cloth traction wheel 19 rotates to lead the double-layer filter cloth of the sandwich sludge after squeezing out of the first dewatering chamber 6. The lower filter cloth barrel 14 rotates clockwise to recover the lower filter cloth 12, and the upper filter cloth barrel 17 rotates counterclockwise to recover the upper filter cloth 16. The dewatered sludge is scraped off by the filter cloth scraper 35, sent to the dewatered sludge collection tank 37 through the dewatered sludge conveyor belt 36, and pumped out by the screw pump. At this time, the second dewatering chamber 24 of the first working area A enters the squeezing-pressure relief working state, and the principle process is the same as described above.

[0044] When the double-layer filter cloth of the interlayer sludge in the first dehydration chamber 6 of the second working area B-1 is completely recovered and the dehydrated sludge is discharged, the system enters the following state: Figure 5 The mud-intake-pressure-relief working condition is shown, the first dehydration chamber 6 of the second working area B-1 enters the mud-intake working condition, and the second dehydration chamber 24 of the first working area A continues the squeezing-pressure-relief working condition. After this working condition is completed, the system enters the following working condition: Figure 5 The pressing and mud discharging conditions shown are the same as described above in principle.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and should all be included in the scope of the claims and specification of the present invention.

Claims

1. A multi-working area longitudinal squeezing and dewatering system for sludge, characterized in that: It includes a first working area, a second working area and a third working area; wherein the second working area and the third working area have the same structure, and the second working area and the third working area are respectively arranged on both sides of the first working area; the first working area is used for squeezing sludge dewatering, and the second working area and the third working area are both used for sludge inlet or outlet; When the multi-working zone longitudinal squeezing and dehydration system is in operation, a cyclic working process includes the initial mud feeding condition, squeezing-mud feeding condition, mud discharge-squeezing condition and mud feeding-pressure relief condition in sequence; Under the initial mud-injection condition, mud is injected into the second working area, the first working area is maintained, and the third working area is maintained; Under the condition of squeezing and mud feeding, the second working area is maintained, the first working area is squeezed and depressurized, and the third working area is mud fed; In the mud discharge-squeezing working condition, the second working area discharges mud, the first working area squeezes, and the third working area is maintained; Under the mud-injection-pressure relief working condition, mud is injected into the second working area, the first working area is squeezed-pressure relieved, and the third working area is maintained; Under the squeezing-mud discharge working condition, the second working area is maintained, the first working area is squeezed, and the third working area is mud discharged.

2. The multi-working zone longitudinal squeezing and dewatering system for sludge according to claim 1 is characterized in that: The second working area includes a truss, a transverse hydraulic-electric control system, a transverse hydraulic device, a hydraulic push rod, a pad, a mud feeding device and a moving wheel; wherein the truss is provided with a transverse hydraulic-electric control system, a transverse hydraulic device, a hydraulic push rod and a first pad, the transverse hydraulic-electric control system is connected to the transverse hydraulic device, the transverse hydraulic device is connected to the hydraulic push rod, the hydraulic push rod is connected to the first pad, the first pad is connected to the first dehydration chamber, the first dehydration chamber is arranged on the first dehydration chamber moving platform, and the mud feeding device is movably arranged on the upper track of the truss through the moving wheel.

3. The multi-working zone longitudinal squeezing and dewatering system for sludge according to claim 2 is characterized in that: The mud feeding device is provided with a feeding bin, a lower filter cloth, a first filter cloth traction wheel, a lower filter cloth barrel, a second filter cloth traction wheel, an upper filter cloth, an upper filter cloth barrel, and a third filter cloth traction wheel; a mud conveying pipe is provided corresponding to the feeding bin; When the second working area is fed with mud, the sludge to be dehydrated is pumped into the feed bin through the mud conveying pipe, and the sludge in the feed bin is pumped to the upper surface of the lower filter cloth at a set speed, and the lower filter cloth is brought out of the lower filter cloth barrel by the first filter cloth traction wheel, and the lower filter cloth barrel rotates counterclockwise; the second filter cloth traction wheel brings the upper filter cloth out of the upper filter cloth barrel, and the upper filter cloth barrel rotates clockwise; the upper filter cloth and the lower filter cloth together constitute a double-layer filter cloth of the interlayer sludge to be dehydrated, and the double-layer filter cloth of the interlayer sludge to be dehydrated moves toward the first dehydration chamber under the drive of the third filter cloth traction wheel, and after the overall left and right movement of the mud feeding device, the double-layer filter cloth of the interlayer sludge to be dehydrated is stacked in the first dehydration chamber, wherein the interlayer of the sludge to be dehydrated is 100 to 300 layers, and the thickness of each layer is less than 5 to 10 mm.

4. The multi-working zone longitudinal squeezing and dewatering system for sludge according to claim 3 is characterized in that: When the mud feeding of the second working area is completed, the transverse hydraulic device in the second working area and the transverse hydraulic device in the third working area are started simultaneously under the control of the corresponding transverse hydraulic electronic control system, the transverse hydraulic device in the second working area increases pressure, and the transverse hydraulic device in the third working area releases pressure, and the hydraulic pushing rod in the second working area pushes the first dehydration chamber moving platform carrying the first dehydration chamber to move toward the first working area, and the first moving platform is supported by a first moving wheel, and the second dehydration chamber set in the first working area and the second dehydration chamber moving platform carrying the second dehydration chamber are pushed to move toward the third working area through the second pad, and the second moving platform is supported by a second moving wheel, and the hydraulic pushing rod in the third working area retracts the transverse hydraulic device.

5. The multi-working zone longitudinal squeezing and dewatering system for sludge according to claim 4 is characterized in that: The first working area includes a pressurizing frame, a longitudinal support column, a longitudinal hydraulic system, a longitudinal pressurizing column, a pressurizing plate and a longitudinal hydraulic electric control system; wherein the longitudinal support column supports the pressurizing frame, the longitudinal hydraulic system is connected to the pressurizing plate through the longitudinal pressurizing column, and the longitudinal hydraulic electric control system is connected to the longitudinal hydraulic system; transverse drainage pipes and longitudinal drainage pipes are arranged in the four outer frames of the first dehydration chamber; When the first working area is squeezing and unloading, with the first dehydration chamber located directly below the pressure frame, the longitudinal pressure column and the pressure plate are driven by the longitudinal hydraulic system to apply longitudinal pressure to the double-layer dehydration filter cloth pile containing sludge; the sludge dehydration liquid is discharged from the system through the transverse drainage pipes and the longitudinal drainage pipes arranged in the four outer frames of the first dehydration chamber, and the longitudinal hydraulic system is controlled by the longitudinal hydraulic electronic control system.

6. The multi-working zone longitudinal squeezing and dewatering system for sludge according to claim 5 is characterized in that: The longitudinal hydraulic electronic control system controls the longitudinal hydraulic system based on a set pressure value, the set pressure value includes a first value, a second value and a third value. In the pressurization stage, the longitudinal hydraulic electronic control system controls the pressure applied by the longitudinal hydraulic system to increase from 0 to the first value within a unit time, and maintain it for a unit time, then increase from the first value to the second value within a unit time and maintain it for a unit time, and finally increase from the second value to the third value within a unit time, and maintain the third value within a set time, and the third value is 15 to 32 MPa; In the pressure relief stage, the longitudinal hydraulic electronic control system controls the pressure applied by the longitudinal hydraulic system to decrease from the third value to the second value within one unit time, and after maintaining it for one unit time, it decreases from the second value to 0 within one unit time.

7. The multi-working zone longitudinal squeezing and dewatering system for sludge according to claim 5, characterized in that: When the squeezing and pressure relief in the first working area are completed and the mud feeding in the third working area is completed, the transverse hydraulic device in the second working area and the transverse hydraulic device in the third working area are started simultaneously under the control of the correspondingly connected transverse hydraulic electric control system, the transverse hydraulic device in the second working area relieves pressure, and the transverse hydraulic device in the third working area increases pressure, and the hydraulic push rod in the third working area pushes the second dehydration chamber moving platform carrying the second dehydration chamber to move toward the first working area, and the first dehydration chamber and the first dehydration chamber moving platform in the first working area are pushed by the second pad. The platform moves to the second working area, the hydraulic push rod of the second working area retracts the horizontal hydraulic device, the mud feeding device switches to the mud discharging state, moves left and right above the truss, and the third filter cloth traction wheel rotates to lead the double-layer filter cloth of the sandwich sludge after squeezing out of the first dewatering chamber; the lower filter cloth barrel rotates clockwise to recycle the lower filter cloth, and the upper filter cloth barrel rotates counterclockwise to recycle the upper filter cloth. The dewatered sludge is scraped off by the filter cloth scraper, sent to the dewatered sludge collecting tank via the dewatered sludge conveyor belt, and pumped out by the screw pump. At this time, the second dewatering chamber located in the first working area is squeezed and unloaded.

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