External expansion type rotational flow concentration device and sludge treatment system

Abstract

The utility model discloses an external expansion type rotational flow concentration device and a sludge treatment system, and relates to the technical field of sewage treatment, the external expansion type rotational flow concentration device comprises an anti-backflow cone, an overflow flow guide pipe, a fixing mechanism and a rotational flow cylinder body, the anti-backflow cone, the overflow flow guide pipe and the rotational flow cylinder body are coaxially arranged; the rotational flow cylinder comprises an equal-diameter cylinder, an expanded-diameter cylinder, a reduced-diameter cylinder and a bottom drainage cylinder which are coaxially arranged and communicated with one another, the overflow flow guide pipe and the rotational flow cylinder are coaxially arranged, the anti-backflow cone is arranged in the reduced-diameter cylinder through a fixing mechanism, the small-diameter end of the top of the anti-backflow cone is arranged upwards, and the top of the anti-backflow cone is arranged downwards. And a flow guide gap is reserved between the anti-backflow cone and the inner wall surface of the reducing cylinder. According to the external expansion type rotational flow concentration device disclosed by the utility model, the anti-backflow cone is positively arranged in the rotational flow cylinder body, so that biological floc and a carrier which are separated are prevented from being reversely mixed again.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to an outward-expanding cyclone concentrating device and a sludge treatment system. Background Art

[0002] Existing cyclones are mostly used for mineral processing and separation or classification of materials with large density differences, and cannot be effectively applied to lightweight sludge and carriers with low density differences, small particle sizes, and easy dispersion.

[0003] The secondary sedimentation tank in the sewage treatment plant separates mud and water through gravity sedimentation for a certain period of time to achieve clarification of the mixed liquor. Among them, the higher the concentration of the mixed liquor entering the secondary sedimentation tank, the longer it takes to clarify. Since the volume of the secondary sedimentation tank and the treatment scale of the water plant are fixed during the design, the residence time of the mixed liquor in the secondary sedimentation tank is fixed. When the concentration of the mixed liquor continues to increase, sludge will enter the subsequent treatment structure from the secondary sedimentation tank along with the effluent, affecting the effluent water quality and the operation effect of the subsequent structures. This phenomenon is commonly known as "sludge running". In addition, since the viscosity of water increases with the decrease in temperature, the sedimentation capacity of the sludge in the secondary sedimentation tank decreases with the increase in viscosity. Therefore, when the water plant is operated during the low temperature period in winter, the sedimentation effect of the secondary sedimentation tank becomes weaker, and the sludge running of the secondary sedimentation tank is more serious when operating at low temperatures.

[0004] High-concentration composite powder carrier biological fluidized bed technology uses micron-level carriers with good biological affinity to attach microorganisms, forming a "double mud" system of attached growth and suspended growth; the technology has a high concentration of mixed liquid in the biochemical pool (6g / L-8g / L, the conventional activated sludge method is 3g / L-4g / L). High-concentration composite powder carrier biological fluidized bed technology has a small carrier particle size, micron-level, 10μmˉ100μm, the carrier itself is porous, not a solid structure, and the carrier shape is mostly cake-shaped and columnar. The density of the carrier dispersed in the water is slightly different from the density of the sludge itself. The sludge density is 1.05g / cm3ˉ1.2g / cm3, and the biological carrier density is 1.15g / cm3-1.35g / cm3.

[0005] In the existing biological fluidized bed technology using high-concentration composite powder carriers, the cyclone separator for separating light sludge and carriers has poor separation effect, resulting in small particle size and low density biological carriers being difficult to separate, leading to a technical problem of heavy load on the secondary sedimentation tank. Utility Model Content

[0006] The outward expansion type cyclone concentrating device provided by the utility model solves the technical problem of poor separation effect of the existing cyclone separator.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0008] An outward expansion type cyclone concentrating device comprises a backflow prevention cone, an overflow guide pipe, a fixing mechanism and a cyclone cylinder, wherein the backflow prevention cone, the overflow guide pipe and the cyclone cylinder are coaxially arranged, and the cyclone cylinder comprises a coaxially arranged and mutually connected equal diameter cylinder, an expanded diameter cylinder, a reduced diameter cylinder and a bottom discharge cylinder, wherein the equal diameter cylinder, the expanded diameter cylinder, the reduced diameter cylinder and the bottom discharge cylinder are sequentially arranged in a height direction and spliced ​​with each other, and a liquid inlet is provided on the equal diameter cylinder, and a liquid inlet is provided on the bottom discharge cylinder. A heavy-mass outlet is provided on the cylinder, and the overflow guide pipe is coaxially arranged with the cyclone cylinder. The top of the overflow guide pipe extends vertically upward and extends out of the equal-diameter cylinder, and the bottom of the overflow guide pipe extends vertically downward and extends into the expanded-diameter cylinder. A central overflow hole is arranged on the central axis of the overflow guide pipe. The anti-backflow cone is arranged in the reduced-diameter cylinder through a fixing mechanism, and the top small-diameter end of the anti-backflow cone is arranged upward, leaving a guide gap between the anti-backflow cone and the inner wall surface of the reduced-diameter cylinder.

[0009] Furthermore, the anti-backflow cone is a solid cone.

[0010] Furthermore, the backflow prevention cone is a hollow cone, and the hollow cone is a thin-walled cone with an opening at the bottom.

[0011] Furthermore, the fixing mechanism includes mounting struts evenly spaced along the circumferential direction, the first end of the mounting struts is fixedly connected to the inner wall surface of the reduced diameter cylinder, and the second end of the mounting struts is fixedly connected to the anti-backflow cone.

[0012] Furthermore, the second end of the mounting support rod is arranged to be tilted upward toward the central axis of the cyclone cylinder and is fixedly connected to the bottom of the anti-backflow cone.

[0013] Furthermore, the fixing mechanism also includes a mounting hanger suspended in the cyclone cylinder, the mounting hanger is coaxially arranged with the cyclone cylinder, and the bottom end of the mounting hanger is fixedly connected to the top end of the anti-backflow cone.

[0014] Furthermore, the expanded diameter cylinder includes a first outer expansion cylinder and a second outer expansion cylinder which are axially connected to each other, the outer expansion cone angle of the first outer expansion cylinder is greater than the outer expansion cone angle of the second outer expansion cylinder, and the cylinder height of the second outer expansion cylinder is not less than the cylinder height of the first outer expansion cylinder.

[0015] Furthermore, the inward cone angle of the reduced diameter cylinder is between the outward cone angle of the first outward expanding cylinder and the outward cone angle of the second outward expanding cylinder, and the cylinder height of the reduced diameter cylinder is not less than the cylinder height of the expanded diameter cylinder.

[0016] Furthermore, the central overflow hole is a hole of equal diameter, and a section of the overflow guide tube located in the expanded diameter cylinder is a contraction section with a gradually contracting outer wall surface.

[0017] The utility model also provides a sludge treatment system, comprising the above-mentioned outward expansion type cyclone concentrating device.

[0018] The utility model has the following beneficial effects:

[0019] The utility model discloses an outward-expanding cyclone concentrating device, comprising an anti-backflow cone, an overflow guide pipe, a fixing mechanism and a cyclone cylinder. The cyclone cylinder comprises an equal-diameter cylinder, an expanded-diameter cylinder, a reduced-diameter cylinder and a bottom discharge cylinder. The flocs and biological carriers in the equal-diameter cylinder are compressed, the biological carriers and flocs in the expanded-diameter cylinder migrate to the outer circumferential wall surface, and cyclone separation is performed in the reduced-diameter cylinder. At the same time, an anti-backflow cone is arranged in the equal-diameter cylinder, the top small-diameter end of the anti-backflow cone is arranged upward, and the bottom large-diameter end of the anti-backflow cone is arranged downward, so as to prevent the biological flocs and carriers that have been separated in the equal-diameter cylinder from flowing back and causing re-mixing. After the anti-backflow cone is installed, the generation of backmixing can be effectively suppressed. The utility model discloses an outward-expanding cyclone concentrating device, comprising an equal-diameter cylinder, an expanded-diameter cylinder, a reduced-diameter cylinder and a bottom discharge cylinder. The flocs and biological carriers in the equal-diameter cylinder are compressed, the biological carriers and flocs in the expanded-diameter cylinder migrate to the outer circumferential wall surface, and cyclone separation is performed in the reduced-diameter cylinder. At the same time, an anti-backflow cone is arranged in the equal-diameter cylinder, the top small-diameter end of the anti-backflow cone is arranged upward, and the bottom large-diameter end of the anti-backflow cone is arranged downward, so as to prevent the biological flocs and carriers that have been separated in the equal-diameter cylinder from flowing back and causing re-mixing. After the anti-backflow cone is installed, the generation of backmixing can be effectively suppressed. The utility model discloses an outward-expanding cyclone concentrating device, having a good separation effect.

[0020] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0022] Figure 1 This is one of the structural schematic diagrams of an outward-expanding cyclone concentrator in one embodiment of the utility model;

[0023] Figure 2 This is the second structural schematic diagram of the outward expansion type cyclone concentrating device in one embodiment of the utility model;

[0024] Figure 3 yes Figure 1 One of the structural schematic diagrams of the anti-reflux cone in FIG.

[0025] Figure 4 yes Figure 1 The second structural diagram of the anti-backflow cone.

[0026] Description of Figure Numbers:

[0027] 100. Outward-expanding cyclone concentrator; 10. Anti-backflow cone; 20. Overflow guide pipe; 30. Fixing mechanism; 31. Installing support rod; 32. Installing suspension rod; 40. Cyclone cylinder; 41. Equal-diameter cylinder; 42. Expanded-diameter cylinder; 421. First outward-expanding cylinder; 422. Second outward-expanding cylinder; 43. Reduced-diameter cylinder; 44. Bottom discharge cylinder; 441. Heavy-mass outlet. DETAILED DESCRIPTION

[0028] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0032] Through research, it was found that in the existing sewage treatment, the cyclone separator for separating light sludge and carriers uses a straight-cylinder structure for separation, and the separation effect is poor; and the biological flocs and carriers that have been separated inside the cyclone are prone to form air columns under high-speed hydraulic conditions near the bottom flow outlet of the cyclone, resulting in backflow and back mixing, causing the central overflow pipe to discharge heavy biological flocs and complete carriers that should have been discharged from the bottom flow, resulting in poor separation effect.

[0033] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the utility model provides an outward expansion type cyclone concentrating device 100, including a backflow prevention cone 10, an overflow guide pipe 20, a fixing mechanism 30 and a cyclone cylinder 40, the backflow prevention cone 10, the overflow guide pipe 20 and the cyclone cylinder 40 are coaxially arranged, the cyclone cylinder 40 includes a coaxially arranged equal diameter cylinder 41, an expanded diameter cylinder 42, a reduced diameter cylinder 43 and a bottom discharge cylinder 44, the equal diameter cylinder 41, the expanded diameter cylinder 42, the reduced diameter cylinder 43 and the bottom discharge cylinder 44 are arranged in sequence along the height direction and spliced ​​with each other, and the equal diameter cylinder 41 is provided with a liquid inlet A heavy outlet 441 is provided on the bottom discharge cylinder 44, the overflow guide pipe 20 is coaxially arranged with the cyclone cylinder 40, the top of the overflow guide pipe 20 extends vertically upward and extends out of the equal-diameter cylinder 41, the bottom of the overflow guide pipe 20 extends vertically downward and extends into the expanded-diameter cylinder 42, a central overflow hole is arranged on the central axis of the overflow guide pipe 20, the anti-backflow cone 10 is arranged in the reduced-diameter cylinder 43 through a fixing mechanism 30, the top small-diameter end of the anti-backflow cone 10 is arranged upward, and a guide gap is left between the anti-backflow cone 10 and the inner wall surface of the reduced-diameter cylinder 43.

[0034] The outward-expanding cyclone concentrating device 100 of the utility model comprises an anti-backflow cone 10, an overflow guide pipe 20, a fixing mechanism 30 and a cyclone cylinder 40. The cyclone cylinder 40 comprises an equal-diameter cylinder 41, an expanded-diameter cylinder 42, a reduced-diameter cylinder 43 and a bottom discharge cylinder 44. The flocs and biological carriers in the equal-diameter cylinder 41 are compressed, the biological carriers and flocs in the expanded-diameter cylinder 42 migrate to the outer circumferential wall surface, and cyclone separation is performed in the reduced-diameter cylinder 43. At the same time, the anti-backflow cone 10 is arranged in the equal-diameter cylinder 41, the top small-diameter end of the anti-backflow cone 10 is arranged upward, and the bottom large-diameter end of the anti-backflow cone 10 is arranged downward, so as to prevent the biological flocs and carriers that have been separated in the equal-diameter cylinder 41 from flowing back and causing re-mixing. After the anti-backflow cone is installed, the generation of backmixing can be effectively suppressed. The outward-expanding cyclone concentrating device 100 of the utility model has the beneficial effect of good separation effect.

[0035] It can be understood that the outward expansion type cyclone concentrating device 100 includes an inlet compression zone, an outward expansion adjustment zone, a conical selection zone and a bottom discharge zone which are interconnected, wherein the inlet compression zone is in the equal diameter cylinder 41, the outward expansion adjustment zone is in the enlarged diameter cylinder 42, the conical selection zone is in the reduced diameter cylinder 43, and the bottom discharge zone is in the bottom discharge cylinder 44. Among them, inlet compression zone: the main separation target of this outward expansion type cyclone is low density (ρ<1.4g / cm3), small particle size (particle size: 10ˉ50μm), biological carriers, which are easily wrapped by flocs. The size of the inlet compression zone of the cyclone is small, and the fluid flow rate in this area is fast. The main function is to compress the flocs and biological carriers, and provide a huge centrifugal force. In the compression zone, under the action of the strong cyclonic centrifugal force, the biological carriers with higher density and other impurities with lower density tend to move toward the wall. Outward expansion adjustment zone: In the compression zone, the sludge is subjected to strong centrifugal force. However, due to the high sludge concentration, the biological carriers with higher density cannot break through the mud layer and migrate to the wall. The wall of the outward expansion adjustment zone expands outward to provide a larger space. The biological carriers that have strong centrifugal force in the compression zone but cannot break through the mud layer can migrate outward in the outward expansion adjustment zone. The biological carriers and flocs in this area will migrate to the wall under the action of centrifugal force at the same time. However, the biological carriers have a higher density and migrate faster, so the wall will accumulate more biological carriers. Conical selection zone: In the outward expansion adjustment zone, the biological carriers and flocs migrate to the wall. The biological carriers have a higher density and migrate more to the vicinity of the wall. The flocs with lower density are relatively close to the center. The conical selection zone provides a reaction force perpendicular to the wall pointing to the middle axis, causing the fluid near the central axis to be discharged from the upper overflow guide tube 20. Due to the dual effects of the inlet compression zone and the outward expansion adjustment zone, the low-density, small-size biological carriers are effectively dispersed near the wall, so that they can be collected by the bottom flow port. The straight cylindrical structure of the existing conventional cyclone has been solved. Due to the lack of compression and adjustment, the low-density and small-size carriers cannot break through the mud layer and migrate to the wall surface, and often flow out of the overflow pipe with the sludge. Underflow discharge area: The biological carriers swirl down on the wall surface and are discharged from the underflow port (heavy outlet 441).

[0036] It can be understood that the liquid inlet guides the liquid into the equal-diameter cylinder 41 along the tangential direction; the equal-diameter cylinder 41, the expanded-diameter cylinder 42, the reduced-diameter cylinder 43 and the bottom discharge cylinder 44 are interconnected to form a cyclone cylinder 40 with a cyclone separation chamber; the overflow guide tube 20 has a central overflow hole (light outlet) on its central axis, and the bottom of the bottom discharge cylinder 44 has a heavy outlet 441.

[0037] It can be understood that the fixing mechanism 30 can be completely disposed in the cyclone cylinder 40, or can be partially disposed in the cyclone cylinder 40; the fixing mechanism 30 and the cyclone cylinder 40 can be detachably connected or fixedly connected.

[0038] It can be understood that the anti-backflow cone 10 can be a cone or a truncated cone, as long as the large-diameter end of the bottom of the anti-backflow cone 10 is arranged below the small-diameter end of the top so that the anti-backflow cone 10 is placed upright, the radial dimension of the anti-backflow cone 10 gradually shrinks from the bottom to the top, and the anti-backflow cone 10 can suppress the occurrence of back mixing; in the utility model, the anti-backflow cone 10 can be installed with a lower support, or it can be installed with an upper suspension and a lower support.

[0039] Further, the anti-backflow cone 10 is a solid cone, or the anti-backflow cone 10 is a hollow cone, and the hollow cone is a thin-walled cone with an opening at the bottom. In the present invention, the anti-backflow cone 10 can be a solid cone or a hollow cone, as long as it can be blocked by setting the bottom surface of the anti-backflow cone 10. In the present invention, the anti-backflow cone 10 is arranged on the central axis of the cyclone cylinder 40 to suppress the bottom back mixing, so as to achieve better separation.

[0040] Furthermore, the fixing mechanism 30 includes mounting struts 31 evenly spaced along the circumferential direction, the first end of the mounting struts 31 is fixedly connected to the inner wall surface of the reduced diameter cylinder 43, and the second end of the mounting struts 31 is fixedly connected to the anti-backflow cone 10. Optionally, the number of the mounting struts 31 may be three, or four, five, or other numbers.

[0041] More preferably, in order to reduce turbulence, the mounting support rod 31 is arranged close to the bottom of the reduced diameter cylinder 43 and the anti-backflow cone 10 is arranged in a suitable position to effectively suppress backmixing. The second end of the mounting support rod 31 is arranged to be inclined upward toward the central axis of the cyclone cylinder 40 and is fixedly connected to the bottom of the anti-backflow cone 10.

[0042] Furthermore, in order to improve the stability of the structure of the anti-backflow cone 10, the fixing mechanism 30 also includes a mounting hanger 32 suspended in the cyclone cylinder 40, the mounting hanger 32 is coaxially arranged with the cyclone cylinder 40, and the bottom end of the mounting hanger 32 is fixedly connected to the top of the anti-backflow cone 10. In a specific embodiment of the utility model, a connecting flange is arranged at the top protruding end of the overflow guide tube 20, the first end of the mounting hanger 32 is fixed to the overflow guide tube 20 through a cross bar, and the bottom end (second end) of the mounting hanger 32 is fixedly connected to the top of the anti-backflow cone 10, and the anti-backflow cone 10 is reinforced to prevent the anti-backflow cone 10 from swinging, which prevents the anti-backflow cone 10 from swinging and disrupting the cyclone flow field in the cyclone cylinder 40, and is also conducive to eliminating the air column and ensuring the cyclone effect.

[0043] Furthermore, the expanded diameter cylinder 42 includes a first outer expansion cylinder 421 and a second outer expansion cylinder 422 which are axially connected to each other, the outer expansion cone angle α of the first outer expansion cylinder 421 is greater than the outer expansion cone angle β of the second outer expansion cylinder 422, and the cylinder height of the second outer expansion cylinder 422 is not less than the cylinder height of the first outer expansion cylinder 421.

[0044] Furthermore, the inward cone angle σ of the reduced diameter cylinder 43 is between the outward cone angle α of the first outward expanding cylinder 421 and the outward cone angle β of the second outward expanding cylinder 422 , and the cylinder height of the reduced diameter cylinder 43 is not less than the cylinder height of the expanding diameter cylinder 42 .

[0045] Furthermore, in order to increase the expansion space of the expansion adjustment zone, the central overflow hole is a hole of equal diameter, and a section of the overflow guide tube 20 in the expansion cylinder 42 is a contraction section with a gradually contracting outer wall surface.

[0046] In the solution of the utility model, an installation hanger 32 with an axial diameter of 20ˉ50mm is used to replace the position of the air column, that is, the space-occupying effect eliminates the air column; an anti-backflow cone 10 is added, and the blocking effect of the anti-backflow cone section and the drainage effect of the cone surface are utilized to eliminate the air column, so that the cyclone can achieve a good separation and dilution effect, while effectively reducing the operating energy consumption.

[0047] The utility model also provides a sludge treatment system, comprising the above-mentioned outward expansion type cyclone concentrating device 100.

[0048] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An outward expansion type cyclone concentrator, characterized in that: It includes a backflow prevention cone, an overflow guide pipe, a fixing mechanism and a cyclone cylinder, wherein the backflow prevention cone, the overflow guide pipe and the cyclone cylinder are coaxially arranged. The cyclone cylinder comprises a coaxially arranged and mutually connected equal-diameter cylinder, an expanded-diameter cylinder, a reduced-diameter cylinder and a bottom discharge cylinder, wherein the equal-diameter cylinder, the expanded-diameter cylinder, the reduced-diameter cylinder and the bottom discharge cylinder are sequentially arranged in the height direction and spliced ​​with each other, the equal-diameter cylinder is provided with a liquid inlet, and the bottom discharge cylinder is provided with a heavy-mass outlet. The overflow guide pipe is coaxially arranged with the cyclone cylinder, the top of the overflow guide pipe extends vertically upward and extends out of the equal-diameter cylinder, the bottom of the overflow guide pipe extends vertically downward and extends into the expanded-diameter cylinder, a central overflow hole is arranged on the central axis of the overflow guide pipe, the anti-backflow cone is arranged in the reduced-diameter cylinder through the fixing mechanism, the top small-diameter end of the anti-backflow cone is arranged upward, and a guide gap is left between the anti-backflow cone and the inner wall surface of the reduced-diameter cylinder.

2. The outward expansion type cyclone concentrating device according to claim 1, characterized in that: The anti-backflow cone is a solid cone.

3. The outward expansion type cyclone concentrating device according to claim 1, characterized in that: The anti-backflow cone is a hollow cone, and the hollow cone is a thin-walled cone with an opening at the bottom.

4. The outward expansion type cyclone concentrating device according to any one of claims 1 to 3, characterized in that: The fixing mechanism comprises mounting struts evenly spaced along the circumferential direction, wherein the first end of the mounting struts is fixedly connected to the inner wall surface of the reduced diameter cylinder, and the second end of the mounting struts is fixedly connected to the anti-backflow cone.

5. The outward expansion type cyclone concentrating device according to claim 4, characterized in that: The second end of the mounting support rod is arranged to tilt upward toward the central axis of the cyclone cylinder and is fixedly connected to the bottom of the anti-backflow cone.

6. The outward expansion type cyclone concentrating device according to claim 5, characterized in that: The fixing mechanism also includes a mounting hanger suspended in the cyclone cylinder, the mounting hanger is coaxially arranged with the cyclone cylinder, and the bottom end of the mounting hanger is fixedly connected to the top end of the anti-backflow cone.

7. The outward expansion type cyclone concentrating device according to any one of claims 1 to 3, characterized in that: The expanded diameter cylinder includes a first outer expansion cylinder and a second outer expansion cylinder connected to each other along the axial direction, the outer expansion cone angle of the first outer expansion cylinder is greater than the outer expansion cone angle of the second outer expansion cylinder, and the cylinder height of the second outer expansion cylinder is not less than the cylinder height of the first outer expansion cylinder.

8. The outward expansion type cyclone concentrating device according to claim 7, characterized in that: The inwardly inclined cone angle of the reduced diameter cylinder is between the outwardly expanding cone angle of the first outwardly expanding cylinder and the outwardly expanding cone angle of the second outwardly expanding cylinder, and the cylinder height of the reduced diameter cylinder is not less than the cylinder height of the expanding diameter cylinder.

9. The outward expansion type cyclone concentrating device according to any one of claims 1 to 3, characterized in that: The central overflow hole is a hole of equal diameter, and a section of the overflow guide tube located in the expanded diameter cylinder is a contraction section with a gradually contracting outer wall surface.

10. A sludge treatment system, characterized in that: It comprises the outward expansion type cyclone concentrating device as described in any one of claims 1 to 9.

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