A sludge pretreatment device

Abstract

This invention discloses a sludge pretreatment device, comprising a diffuser, an orifice plate, an adjustable jet assembly, and a contraction pipe. The diffuser includes a first small-diameter pipe section and a first large-diameter pipe section connected by a first transition pipe section. The contraction pipe includes a second small-diameter pipe section and a second large-diameter pipe section connected by a second transition pipe section. The first large-diameter pipe section and the second large-diameter pipe section communicate to form a pressurization chamber. The orifice plate is disposed within the pipe of the first large-diameter pipe section for cutting and dispersing the transported sludge. The adjustable jet assembly is disposed within the pipe of the contraction pipe for adjusting the sludge flow rate to induce alternating cutting separation and pressure differential eddy currents in the sludge. This invention further enhances the oxygen-consuming activity of active substances in organic sludge through flow-impact effects and eddy current effects, enabling the release of more gases trapped in the sludge and generating a certain degree of solid-liquid separation, thereby improving the modification efficiency and the absorption and reaction effect of the agents in subsequent chemical conditioning processes.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment equipment technology, and in particular to a sludge pretreatment device. Background Technology

[0002] The main process flow for municipal sewage sludge treatment consists of five key stages: sludge suction → concentration → conditioning → dewatering → disposal. Among these, conditioning is crucial for the subsequent dewatering process. Conditioning involves adding chemical agents such as flocculants, iron salts, and acidic or alkaline agents like sodium hypochlorite to alter some of the physical properties of the municipal sewage sludge. These alterations include processes like oil dissolving and gel breaking, acid etching and inactivation, and cell wall disruption, all of which improve the sludge's water transport and dewatering performance.

[0003] However, during this conditioning process, the amount of chemicals added and the required reaction time between the chemicals and the sludge depend on the characteristics of the incoming sludge, such as viscosity, oiliness, and solid content. This can easily lead to excessive dosage, high chemical costs, reduced dewatering stability, and the filtrate discharged after dewatering is more likely to cause secondary pollution, making it difficult to directly discharge into the sewer system.

[0004] Therefore, to solve the above problems and improve the efficiency of the fusion reaction between the agent and the sludge, as well as the economic efficiency of the agent's use, it is necessary to perform appropriate pretreatment on the sludge before conditioning. This pretreatment should ensure that the sludge completes the necessary dissolution preparation before contacting the agent. For example, it can increase the activity of the sludge, cause sludge segregation, and release some ammonia nitrogen gas trapped in the solid-liquid mixture of activated sludge. This will improve the absorption and modification efficiency of the agent during the later conditioning process, enhance the conditioning and modification effect of the sludge, save on the amount of agent used, and control the acid-base index of the dewatered wastewater. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a sludge pretreatment device.

[0006] To solve the above-mentioned technical problems, the present invention is implemented using the following technical solution:

[0007] This invention provides a sludge pretreatment device, including a diffuser, an orifice plate, an adjustable jet assembly, and a shrinkage tube;

[0008] The diffuser includes a first small-diameter pipe section and a first large-diameter pipe section connected by a first transition pipe section; the contraction pipe includes a second small-diameter pipe section and a second large-diameter pipe section connected by a second transition pipe section; the first large-diameter pipe section and the second large-diameter pipe section communicate to form a pressurization chamber.

[0009] The orifice plate is installed inside the first large-diameter pipe section and is used to cut the dispersed sludge being transported; the adjustable jet assembly is installed inside the contraction pipe and is used to adjust the flow rate of the sludge so that the sludge generates alternating cutting separation and pressure differential eddies.

[0010] Optionally, the adjustable jet assembly includes an adjustable variable cone guide tube, a perforated plate, and a cone-shaped jet tube;

[0011] The perforated plate is installed at the liquid inlet of the second transition pipe section; the adjustable variable cone guide pipe is installed on one side of the perforated plate and located inside the pipe of the second large diameter pipe section; the conical jet pipe is installed on the other side of the perforated plate and located inside the pipe of the second transition pipe section.

[0012] Optionally, the inlet of both the adjustable variable cone guide tube and the cone jet tube is larger than its corresponding outlet.

[0013] Optionally, the adjustable tapered guide tube is formed by multiple arc-shaped guide plates surrounding each other, with adjacent arc-shaped guide plates being slidably connected.

[0014] Optionally, the adjustable jet assembly includes an adjustment bracket; the adjustment bracket includes a support screw, a movable nut, and multiple connecting rods; one end of the support screw is connected to a perforated plate; the movable nut is sleeved on the support screw, and one end of each connecting rod is evenly hinged to the outer peripheral wall of the movable nut to form an umbrella frame structure;

[0015] The number of connecting rods is the same as the number of arc-shaped guide plates, and the other end of each connecting rod is respectively hinged to the inner wall of one end of each arc-shaped guide plate.

[0016] Optionally, when the movable nut rotates to its limit position along the other end of the support screw, one end of each of the arc-shaped guide plates is in contact with the inner wall of the second large-diameter pipe section under the pull of each connecting rod.

[0017] Optionally, the first large-diameter pipe section and the second large-diameter pipe section are connected by a flange.

[0018] Optionally, the perforated plate has multiple through holes; the sum of the areas of all the through holes is not less than the inner cross-sectional dimension of the first small-diameter pipe section.

[0019] Optionally, the through holes are arranged in a circular array on the perforated plate.

[0020] Optionally, the perforated plate has multiple arc-shaped perforations; the center of each arc-shaped perforation coincides with the center of the perforated plate.

[0021] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0022] This invention utilizes the flow-blocking and dispersion effects of the orifice plate inside the pipe and the adjustable jet assembly to achieve the flow-blocking and cutting effect of the fluid passing through the orifice plate and the pressure difference eddy current effect between the pipe diameter and the adjustable jet assembly. Through flow-blocking, pressure-increasing, speed-changing, and eddy current friction, the organic sludge can release trapped gases in advance during pipeline transportation. Furthermore, by adding an adjustable jet assembly inside the pipe, the fluid can generate a Karman vortex street phenomenon, i.e., eddy current friction, thereby increasing the oxygen-consuming activity of the organic sludge. This allows for the release of more trapped gases in the sludge, improving the absorption and integration efficiency of chemicals in subsequent conditioning processes. In other words, it improves the modification efficiency and absorption and modification effect of chemicals during the conditioning process, reduces the cost and dosage of chemicals, and improves the dewatering performance of the sludge after conditioning. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a cross-sectional structural schematic diagram of the sludge pretreatment pretreatment device provided in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the diffuser tube and the shrink tube when they are not assembled, according to an embodiment of the present invention;

[0026] Figure 3 These are schematic diagrams of the adjustable jet assembly provided in this embodiment of the invention from two different perspectives.

[0027] Figure 4 This is an exploded structural diagram of the adjustable jet assembly provided in an embodiment of the present invention;

[0028] Figure 5 These are schematic diagrams of the adjustable tapered guide tube and the adjusting bracket from two different perspectives, provided in an embodiment of the present invention.

[0029] Figure 6 This is a schematic diagram of the structure of the adjustment bracket provided in an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the connection between the connecting rod and the arc-shaped guide plate provided in an embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of the structure of the perforated plate provided in an embodiment of the present invention;

[0032] Explanation of reference numerals in the attached drawings: 1. Diffuser; 11. First small-diameter pipe section; 12. First transition pipe section; 13. First large-diameter pipe section; 2. Orifice plate; 3. Adjustable jet assembly; 31. Adjustable variable-cone guide pipe; 311. Arc-shaped guide plate; 32. Hollowed-out plate; 33. Conical jet pipe; 4. Contraction pipe; 41. Second small-diameter pipe section; 42. Second transition pipe section; 43. Second large-diameter pipe section; 5. Adjusting bracket; 51. Support screw; 52. Movable nut; 53. Connecting rod; 6. Flange; A. Pressure chamber; B. Through hole; C. Arc-shaped hollowed-out hole. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0034] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and 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 a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] like Figure 1 , Figure 2As shown, the sludge pretreatment device provided in this embodiment of the invention includes a diffuser 1, an orifice plate 2, an adjustable jet assembly 3, and a contraction pipe 4. The diffuser 1 includes a first small-diameter pipe section 11 and a first large-diameter pipe section 13 connected by a first transition pipe section 12. The contraction pipe 4 includes a second small-diameter pipe section 41 and a second large-diameter pipe section 43 connected by a second transition pipe section 42. The first large-diameter pipe section 13 and the second large-diameter pipe section 43 communicate to form a pressurization chamber A. The orifice plate 2 is disposed within the pipe of the first large-diameter pipe section 13 for cutting and dispersing the transported sludge. The adjustable jet assembly 3 is disposed within the pipe of the contraction pipe 4 for adjusting the sludge flow rate to induce alternating separation and differential pressure eddies in the sludge.

[0037] Reference Figures 3 to 5 As shown, the adjustable jet assembly 3 includes an adjustable variable cone guide tube 31, a perforated plate 32, a conical jet tube 33, and an adjusting bracket 5. The perforated plate 32 is installed at the inlet port of the second transition pipe section 42. The adjustable variable cone guide tube 31 is installed on one side of the perforated plate 32 via the adjusting bracket 5 and is located inside the pipe of the second large-diameter pipe section 43. The conical jet tube 33 is installed on the other side of the perforated plate 32 and is located inside the pipe of the second transition pipe section 42. The inlets of the adjustable variable cone guide tube 31 and the conical jet tube 33 are both larger than their corresponding outlets. In addition, the tube body of the adjustable variable cone guide tube 31 is formed by multiple arc-shaped guide plates 311 surrounding each other, and adjacent arc-shaped guide plates 311 are slidably connected.

[0038] As one embodiment of the present invention, such as Figure 6 As shown, the adjusting bracket 5 includes a supporting screw 51, a movable nut 52, and multiple connecting rods 53; one end of the supporting screw 51 is connected to the perforated plate 32; the movable nut 52 is sleeved on the supporting screw 51, and one end of each connecting rod 53 is evenly hinged to the outer peripheral wall of the movable nut 52 to form an umbrella frame structure; wherein, the number of connecting rods 53 is the same as the number of arc-shaped guide plates 311, as shown in the figure. Figure 7 As shown, the other end of each connecting rod 53 is hinged to the inner wall of one end of each arc-shaped guide plate 311.

[0039] In this embodiment, the adjustable jet assembly 3 has four connecting rods 53 and four arc-shaped guide plates 311. The center of the movable nut 52 is provided with a threaded hole that rotates with the movable nut 52. U-shaped mounting seats are provided on the outer walls of the movable nut 52. One end of each connecting rod 53 is provided with a mounting hole. A pin is used to pass through the mounting hole of the connecting rod 53 to hinge one end of the connecting rod 53 in the U-shaped groove of the U-shaped mounting seat.

[0040] Furthermore, the arc-shaped guide plate 311 provided in this embodiment is designed as a quarter circle, and is conical in shape according to the layout of the intersection point, and surrounds an adjustable variable cone guide tube 31, realizing the adjustable diameter contraction and expansion structure of the adjustable variable cone guide tube 31; wherein, the movable nut 52 can achieve self-locking at any position when it rotates and moves along the axis on the support screw 51; under the movement of the connecting rod 53 driven by the movable nut 52, the arc-shaped guide plate 311 is pulled to achieve the contraction and expansion of the diameter, thereby causing the cone ring formed by the arc-shaped guide plate 311 to produce changes in the size of the cone ring; when the movable nut 52 rotates to the limit position along the other end of the support screw 51, under the pull of each connecting rod 53, one end of each arc-shaped guide plate 311 is in contact with the inner wall of the second large diameter pipe section 43.

[0041] During installation, the orifice plate 2 is welded as a frame inside the first large-diameter pipe section 13, and the perforated plate 32 is welded as a frame at the inlet port of the second transition pipe section 42. The adjustable variable cone guide pipe 31 is installed on one side of the perforated plate 32 via the support screw 51 on the adjusting bracket 5. The inlet of the conical jet pipe 33 is welded to the other side of the perforated plate 32. According to the actual situation, the movable nut 52 is rotated to the specified position on the support screw 51 so that the inlet of the adjustable variable cone guide pipe 31 opens to the required opening degree. The first large-diameter pipe section 13 and the second large-diameter pipe section 43 are connected by flange 6 and fastened by connecting bolts to realize the detachable connection between the first large-diameter pipe section 13 and the second large-diameter pipe section 43.

[0042] As one embodiment of the present invention, such as Figure 8 As shown, the perforated plate 2 has multiple through holes B, and the sum of the hole areas of the through holes B is not less than the inner cross-sectional dimension of the first small-diameter pipe section 11; wherein each through hole B is distributed in a circular array on the perforated plate 2; in addition, the perforated plate 32 has multiple arc-shaped perforated holes C, and the center of each arc-shaped perforated hole C coincides with the center of the perforated plate 32.

[0043] Furthermore, the diffuser 1 and the contraction tube 4 provided in this embodiment are both semi-cavity horn tubes, and the two semi-cavity horn tubes form a spindle-shaped hollow pipe. The sludge enters from the first small-diameter pipe section 11 of the diffuser 1 and exits from the second small-diameter pipe section 41 of the contraction tube 4. In order not to affect the sludge dispersion effect, the pipe end of the second small-diameter pipe section 41 should be unloaded and without back pressure. Therefore, it should be connected to the next stage of collection and storage using an open pipe connection.

[0044] Its working process is as follows: The mud enters through the first small-diameter pipe section 11, passes through the orifice plate 2 at the liquid inlet end of the first large-diameter pipe section 13, and generates fluid cutting. The cut fluid passes through the through hole B of the orifice plate 2 and enters the pressurization chamber A formed by connecting the first large-diameter pipe section 13 and the second large-diameter pipe section 43. The mud obtains a pressurization effect in this pressurization chamber A. The mud continues to move forward and passes through the adjustable jet assembly 3 installed in the contraction pipe 4. The variable diameter structure of the adjustable jet assembly 3 is used to adjust the mud flow rate, so that the mud generates alternating separation and vortex. Fluid changes such as flow friction; by installing two or more of the sludge pretreatment pretreatment devices provided in this embodiment in the overall pipeline system, the sludge in the pipeline can undergo more than two flow obstructions. The sludge fluid is cut by the orifice plate 2 and is again affected by the adjustable jet component 3 in the contraction tube, thereby gaining pressure and speed. This allows the sludge to undergo alternating impacts during transportation, further releasing some of the gas trapped in the sludge. This gas is then rapidly released after the sludge leaves the pipe, thereby indirectly improving the oxygen consumption activity of the active substances in the sludge.

[0045] In summary, the sludge pretreatment device provided in this embodiment of the invention, through the design of flow obstruction and separation by the orifice plate 2, pressurization by the pressurization chamber A, and variable diameter jet generation by the adjustable jet component 3, allows the sludge to undergo the superposition of three fluid variable modes: fluid cutting and dispersion, cavity pressurization and conveying, and internal jet vortex. During the closed conveying process, the ammonia nitrogen gas contained in the sludge is released through the flow obstruction and collision of the pipe internal structural components, the speed variation of the perforation, and the vortex friction, thereby increasing the oxygen consumption activity of the sludge. This facilitates the absorption and fusion reaction of the added agents in the subsequent sludge conditioning and modification treatment, indirectly improving the utilization rate of the agents and the efficiency and effect of subsequent sludge dewatering. The increased oxygen consumption activity of the sludge helps the sludge absorb the agents during the conditioning process. Under the same amount and quality of conditioning, the sludge conveyed by the sludge pretreatment device will have significantly improved utilization rate of the conditioning agents and conditioning and modification effect, thus further improving the dewatering performance of the sludge.

[0046] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A sludge pretreatment device, characterized in that, It includes a diffuser (1), an orifice plate (2), an adjustable jet assembly (3), and a converging tube (4); The diffuser (1) includes a first small-diameter pipe section (11) and a first large-diameter pipe section (13) connected by a first transition pipe section (12); the contraction pipe (4) includes a second small-diameter pipe section (41) and a second large-diameter pipe section (43) connected by a second transition pipe section (42); the first large-diameter pipe section (13) and the second large-diameter pipe section (43) communicate to form a pressurization chamber (A); The orifice plate (2) is installed in the pipe of the first large-diameter pipe section (13) for cutting and dispersing the sludge; the adjustable jet assembly (3) is installed in the pipe of the contraction pipe (4) for adjusting the flow rate of the sludge to generate alternating separation and pressure difference eddy currents in the sludge. The adjustable jet assembly (3) includes an adjustable variable cone guide tube (31), a hollow plate (32), and a cone jet tube (33). The perforated plate (32) is installed at the liquid inlet of the second transition pipe section (42); the adjustable variable cone guide pipe (31) is installed on one side of the perforated plate (32) and is located inside the pipe of the second large diameter pipe section (43); the cone jet pipe (33) is installed on the other side of the perforated plate (32) and is located inside the pipe of the second transition pipe section (42).

2. The sludge pretreatment device according to claim 1, characterized in that, The inlets of both the adjustable tapered guide tube (31) and the conical jet tube (33) are larger than their corresponding outlets.

3. The sludge pretreatment device according to claim 1 or 2, characterized in that, The adjustable tapered guide tube (31) is formed by multiple arc-shaped guide plates (311) surrounding each other, and the adjacent arc-shaped guide plates (311) are slidably connected.

4. The sludge pretreatment device according to claim 3, characterized in that, The adjustable jet assembly (3) includes an adjustment bracket (5); the adjustment bracket (5) includes a support screw (51), a movable nut (52) and multiple connecting rods (53); one end of the support screw (51) is connected to the hollow plate (32); the movable nut (52) is sleeved on the support screw (51), and one end of each of the connecting rods (53) is evenly hinged to the outer peripheral wall of the movable nut (52) to form an umbrella frame structure; The number of connecting rods (53) is the same as the number of arc-shaped guide plates (311), and the other end of each connecting rod (53) is respectively hinged to the inner wall of one end of each arc-shaped guide plate (311).

5. The sludge pretreatment device according to claim 4, characterized in that, When the movable nut (52) rotates to its limit position along the other end of the support screw (51), one end of each of the arc-shaped guide plates (311) is attached to the inner wall of the second large-diameter pipe section (43) under the pull of each connecting rod (53).

6. The sludge pretreatment device according to claim 1, characterized in that, The first large-diameter pipe section (13) and the second large-diameter pipe section (43) are connected by a flange (6).

7. The sludge pretreatment device according to claim 1, characterized in that, The perforated plate (2) has multiple through holes (B); the sum of the hole areas of all through holes (B) is not less than the inner cross-sectional dimension of the first small-diameter pipe section (11).

8. The sludge pretreatment device according to claim 7, characterized in that, Each of the through holes (B) is arranged in a circular array on the perforated plate (2).

9. The sludge pretreatment device according to claim 1, characterized in that, The perforated plate (32) has multiple arc-shaped perforated holes (C); the center of each arc-shaped perforated hole (C) coincides with the center of the perforated plate (32).

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