CN112479543A

CN112479543A - Vertical sludge drying device and operation method

Info

Publication number: CN112479543A
Application number: CN201910865460.3A
Authority: CN
Inventors: 谭玮
Original assignee: Swison Creative Environmental Solutions Co ltd
Current assignee: Guangzhou Zhengsheng Technology Co ltd
Priority date: 2019-09-12
Filing date: 2019-09-12
Publication date: 2021-03-12
Anticipated expiration: 2039-09-12
Also published as: CN112479543B

Abstract

The invention relates to a sludge drying device, which comprises: a housing defining a longitudinal axis; a rotary shaft (301), said rotary shaft (301) being disposed in said housing along said longitudinal axis and being rotationally driven by means of a power input (302); at least one sludge cutting assembly (3A, 3B, 3C), said at least one sludge cutting assembly (3A, 3B, 3C) configured to cut sludge falling thereon, reducing the size of the sludge, thereby facilitating drying; a grinder (4) arranged below the sludge cutting assembly, wherein the grinder (4) is configured to grind sludge falling into the grinder so as to ensure the uniformity of sludge particles; and a scraper (5) for scraping the bottom dried sludge to the outlet, wherein the grinder is positioned between the cutting assembly and the scraper.

Description

Vertical sludge drying device and operation method

Technical Field

The invention relates to the technical field of sludge treatment, in particular to a sludge drying device and an operation method.

Background

With the continuous development of urbanization, the amount of sewage generated in industrial production and life to be treated is gradually increased, and the output of sludge, which is a byproduct after sewage treatment, is also increased. Sludge treatment is more difficult than sewage treatment. In order to treat the sludge, a sewage treatment plant generally reduces the water content of the sludge from more than 90% to 60-80% by a concentration or dehydration method, and then landfills, solidifies or dries the treated sludge. The landfill easily causes the sludge fermentation and the secondary pollution to the environment, and the existing solidification or drying equipment has low efficiency, large energy consumption, poor reduction effect and difficult implementation of subsequent treatment.

However, the current sludge drying equipment has some defects. Most of the existing commonly-used sludge drying devices adopt a horizontal arrangement mode, namely, a shaft of the sludge drying device is arranged along the horizontal direction, so that the occupied area of the sludge drying device is large, and the equipment cost is high. Furthermore, horizontally arranged sludge drying plants generally require the provision of additional sludge transport devices, which also increases the complexity and cost of the plant. In addition, the existing sludge drying equipment is not provided with a cutting device for cutting a large sludge block, so that the large sludge block is difficult to be effectively dried, the drying rate of the sludge is low, the energy consumption is high, and the high productivity requirement is difficult to meet. Moreover, the sludge having a high water content cannot be directly subjected to the end treatment, thereby further causing an increase in the cost of the treatment and disposal.

Chinese invention patent CN201711284814 discloses a sludge low-temperature heat drying device. The material on the first tray drops to the second tray downwards from between first tray and the first cylinder type shells inner wall under the stirring of first carousel on to stir the material on the second tray by second blade and stirring tooth, then fall from the blanking hole of second tray, the material is being stirred and the in-process of whereabouts, with through the dry air-blower drum-in, carry out the heat exchange by the dry hot-blast heat exchange after the gas distribution of gas distribution dish, reach dry purpose, the intensive mixing, the material after the drying is discharged from the discharge gate. But the material bonds on the tray easily in drying process, and the unable even cloth, the area of contact of hot-blast and material is little moreover, reduces material drying efficiency, and mud still has higher moisture content, is difficult to carry out further sludge handling.

With the development of urbanization, there is a need for an apparatus and method suitable for rapid batch industrial treatment and application of sludge.

Disclosure of Invention

Therefore, the technical scheme provides a direct ventilation type sludge drying device, a direct ventilation mode is adopted in a drying machine, a relative rotating assembly is arranged in the drying machine, and the moisture content of sludge is reduced and granular or powder granular sludge is formed through drying, shearing/cutting of the sludge. By the technical scheme, the sludge drying efficiency can be improved, the energy consumption is reduced, the capacity requirement is met, and meanwhile, the tail end treatment of the treated dried sludge is facilitated, so that the treatment cost is reduced.

According to an embodiment of the present invention, there is provided a sludge drying apparatus including: the sludge drying device comprises a shell, wherein the shell defines a longitudinal axis and is provided with at least one feed inlet for conveying sludge to be dried into the sludge drying device, at least one air inlet for conveying a drying gas medium into the sludge drying device and at least one outlet for discharging tail gas and dried sludge; a rotating shaft disposed in the housing along the longitudinal axis and rotationally driven by a power input; at least one sludge cutting assembly configured to cut sludge falling thereon, reducing the size of the sludge, thereby facilitating drying; and the grinder is arranged below the sludge cutting assembly and is configured to grind the sludge falling into the grinder so as to ensure the uniformity of sludge particles.

Preferably, the grinder comprises: a rotatable cone fixed to the rotating shaft; and a grinding cup disposed outside the cone.

Preferably, the grinder further comprises a bucket plate disposed between the cutting assembly and the grinding hood, the upper end of the bucket plate being fixed to the cylinder and the lower end being fixed around the inlet of the grinding hood.

Preferably, each sludge cutting assembly comprises a rotation sub-assembly and a fixation sub-assembly, the rotation sub-assembly comprising at least one arm and at least one first lug provided on each arm, the arms being connected to a side wall of the rotation shaft so as to rotate together with the rotation shaft, the fixation sub-assembly comprising a plurality of fixation rods fixed at a first end to the barrel and at a second end to a central ring provided around the rotation shaft, and at least one ring supported by the plurality of fixation rods, the ring being provided with at least one second lug.

Preferably, the housing comprises an upper cover, a bottom plate and a cylinder, wherein the at least one feed inlet is arranged in the upper cover, and the at least one outlet is arranged at the lower part of the cylinder.

Preferably, the upper cover, the bottom plate and the cylinder are integrally formed.

In one embodiment, the air inlet is provided in the upper cover, and a central axis of the air inlet may be perpendicular to the upper cover. In further embodiments, the air inlet is disposed at an upper portion of the barrel, and a central axis of the air inlet perpendicularly intersects a longitudinal axis of the barrel. In a further embodiment, the gas inlet is arranged with its central axis radially offset with respect to the longitudinal axis of the cylinder by a distance such that the dry gaseous medium is introduced into the cylinder in a direction tangential to the cylinder. In further embodiments, the outlet is provided in the base plate, and a central axis of the outlet may be perpendicular to the base plate. In a further embodiment, the outlet is provided in a lower part of the cylinder, and a central axis of the outlet perpendicularly intersects a longitudinal axis of the cylinder. In another embodiment, the outlet is arranged with its central axis radially offset with respect to the longitudinal axis of the cylinder by a distance such that dried sludge and the drying gaseous medium are discharged from the housing in a direction tangential to the cylinder. In another embodiment, the inner surface of the cylinder is provided with a gas flow guide arranged along a spiral line for guiding the drying gas medium to flow along the path of the spiral line in the cylinder.

Preferably, the sludge drying device further comprises: an air supply device that delivers a dry gas medium to at least one air inlet; and an air inducing device disposed downstream of the outlet.

Preferably, the at least one sludge cutting assembly comprises at least two sludge cutting assemblies.

Preferably, each of the rotating subassemblies includes a plurality of arms and a plurality of first protrusions disposed on each of the arms in a radial direction, each of the stationary subassemblies includes a plurality of rings disposed alternately with the plurality of first protrusions in the radial direction, and each of the rings has a plurality of second protrusions disposed thereon.

Preferably, the number of arms of each rotating sub-assembly is equal to the number of second projections on each ring.

Preferably, the thickness of at least one arm is different from the thickness of the other arms, so as to influence the uniformity of the sludge displacement during the rotation of the rotating sub-assembly, enabling a uniform distribution of the sludge on the annular member.

Preferably, the number of rings of each fixed subassembly is equal to the number of first protrusions on each arm, or 1 or less than the number of first protrusions on each arm, such that the rings alternate with the first protrusions.

The at least one ring-shaped member is fixedly coupled to the upper surfaces of the plurality of fixing bars and is arranged to surround the rotation shaft concentrically with the rotation shaft, and the intervals between any two adjacent ring-shaped members in the radial direction are equal. It will be appreciated that the radial spacing between any two adjacent annuli may not be equal.

Preferably, the power input member is a gear, a sprocket or a pulley, which is mounted on the rotating shaft in a keyed or splined manner for transmitting power to the rotating shaft.

Preferably, the at least one sludge cutting assembly comprises at least a first sludge cutting assembly and at least a second sludge cutting assembly, the at least first sludge cutting assembly being arranged on an upstream side of the at least second sludge cutting assembly with respect to the sludge flow direction.

Preferably, the at least one sludge cutting assembly further comprises at least a third sludge cutting assembly, which is arranged on a downstream side of the at least second sludge cutting assembly with respect to the sludge flow direction.

Preferably, the gap between the adjacent ring-shaped members of at least the first sludge cutting assembly is a, the gap between the adjacent ring-shaped members of at least the second sludge cutting assembly is b, the gap between the adjacent ring-shaped members of at least the third sludge cutting assembly is c, and a is larger than or equal to b and larger than or equal to c.

Preferably, the sludge drying device further comprises a scraper for scraping the bottom dried sludge to the outlet.

Preferably, the scraper is located below the housing and is fixedly connected with the rotating shaft, and the scraper is provided with at least one scraper plate extending outwards from the rotating shaft to the vicinity of the barrel in the radial direction, so that dried sludge is scraped and swept by the at least one scraper plate and is discharged from the outlet.

Preferably, the grinder is located between the cutting assembly and the scraper.

According to another embodiment of the present invention, there is provided a method for operating the sludge drying device, including:

sludge to be dried is supplied into the shell through the at least one feed inlet;

opening a driving source connected with the power input member to enable the power input member to rotate, and then driving the rotating shaft and the at least one sludge cutting assembly to rotate; and

at the same time, the rotatable cone is rotated, thereby grinding sludge between the cone and the grinding hood.

The invention adopts the mode that sludge to be dried and a dry gas medium respectively enter the sludge drying device from the feed inlet and the gas inlet, and dried sludge and tail gas are discharged from the same outlet at the lower part of the cylinder, the dried sludge and the tail gas are not required to be separated, and the dried sludge is driven by the tail gas to be conveyed to a subsequent drying device or a subsequent storage device, so that the drying device is quicker and more efficient, the conveying efficiency of the dried sludge is improved, and the tail gas can be used for further drying the dried sludge in the conveying process. The invention can better ensure the uniformity of sludge particles by arranging the grinder.

In addition, the air supply device and the air inducing device increase the air quantity of the dry gas medium introduced into the sludge drying device, thereby improving the sludge drying efficiency, quickly discharging the dried sludge and tail gas and ensuring the sludge treatment capacity.

Other exemplary embodiments of the present invention will be apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while disclosing exemplary embodiments of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

Drawings

At least one embodiment will hereinafter be described in conjunction with the following drawing figures, wherein like numerals denote like elements.

Fig. 1 is a schematic view of an exemplary sludge drying apparatus according to the present invention.

FIG. 2 is a perspective view of a portion of an exemplary sludge drying apparatus according to the present disclosure, showing one sludge cutting assembly in greater detail.

Fig. 3 is an exploded view of a portion of an exemplary sludge drying apparatus according to the present disclosure, showing a sludge cutting assembly in greater detail.

Fig. 4 shows a perspective view of three exemplary sludge cutting assemblies according to the present invention, showing in more detail the different spacing between adjacent rings.

Fig. 5 is an exploded view of a portion of an exemplary sludge drying apparatus according to the present invention, showing one of the rotating subassemblies in greater detail.

Fig. 6 is an exploded view of a portion of an exemplary sludge drying apparatus according to the present invention, showing the retaining rod and the central ring in greater detail.

Fig. 7 is a perspective view of an exemplary grinder according to the present invention.

Fig. 8 is a partial cross-sectional view of an exemplary grinder according to the present invention.

Fig. 9 is a perspective view of an exemplary scraper according to the present invention.

List of reference numerals:

201: an upper cover;

202: a barrel;

203: a feed inlet;

204: an air inlet;

205: an outlet;

206: a base plate;

301: a rotating shaft;

302: a power input;

3A, 3B, 3C: a sludge cutting assembly;

31, 33, 35: a rotation subassembly;

32, 34, 36: a stator sub-assembly;

351: an arm;

352: a first bump;

361, 361a, 361b, 361c, 361 d: an annular member;

362: a second bump;

363: fixing the rod;

364: a center ring;

4: a grinder;

401: a bucket-shaped plate;

402: a conical body;

403: a grinding cover;

5: scraping the material device;

501: and a scraping plate.

Detailed Description

The following description is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. It will be understood that when an element, component, and/or section is referred to as being "connected to" another element, component, and/or section, it can be directly connected to the other element, component, and/or section, or intervening elements may be present. It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, components, and/or sections, these elements, components, and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component or section from another element, component or section. Thus, a first element, component, or section discussed below could be termed a second element, component, or section without departing from the teachings of the present invention. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and/or the present specification and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Furthermore, it should be noted that the descriptions of the orientations mentioned in the present application, such as "upper", "lower", "upper" and "lower", refer to the installation arrangement of the vertical sludge drying device during normal use, for example, the installation arrangement of the vertical sludge drying device shown in fig. 1. Furthermore, all references to orientations such as "vertical" and "vertical" in this application refer to an orientation or direction perpendicular to horizontal ground along the direction of gravity.

As shown in fig. 1, the sludge drying apparatus comprises a housing, wherein the housing defines a longitudinal axis, and is provided with at least one inlet opening 203 for feeding sludge to be dried into the sludge drying apparatus, at least one inlet opening 204 for feeding a drying gaseous medium into the sludge drying apparatus, and at least one outlet opening 205 for discharging tail gas and dried sludge. Only one inlet opening 203, one inlet opening 204 and one outlet opening 205 are shown in fig. 1. It is understood that the housing may include multiple feed ports 203, multiple intake ports 204, and/or multiple outlet ports 205 without departing from the scope of this invention.

According to an example of the present invention, the housing comprises an upper cover 201, a bottom plate 206 and a cylinder 202, wherein the at least one inlet port 203 is disposed in the upper cover 201, the at least one inlet port 204 is disposed at an upper portion of the cylinder 202, and the at least one outlet port 205 is disposed at a lower portion of the cylinder 202. It is understood that the at least one feed opening 203 may also be disposed in an upper portion of the barrel 202 without departing from the scope of this invention. It should also be understood that the at least one air inlet 204 may also be provided in the upper cover 201 without departing from the scope of the present invention. It should also be understood that the at least one outlet 205 may also be provided in the bottom plate 206 without departing from the scope of the present invention. Further, in the example of the present application, the barrel 202 is cylindrical. It should be understood that other shapes may be employed for the barrel 202, such as regular polygons, etc., without departing from the scope of the present application. In addition, the cylinder 202 may also take a stepped shape, for example, the upper cylinder may have a size greater or smaller than the lower cylinder.

According to one example of the present invention, the upper cover 201, the bottom plate 206, and the cylinder 202 are integrally formed. It is understood that the cover 201, base plate 206 and can 202 may be separate components and sealingly joined together by welding or the like without departing from the scope of this invention.

In order to improve the sludge drying efficiency, an air supply device is arranged at the position of at least one air inlet 204, and an air inducing device is arranged at the position of at least one outlet 205. According to an example of the present invention, the air blowing device may be a blower, a fan, a compressor, or the like. According to an example of the invention, the air inducing device may be an induced draft fan, a suction device, or the like. After the sludge to be dried enters the sludge drying device from the feeding hole, the air supply device and the air inducing device can be started, and the air quantity of a dry gas medium introduced into the sludge drying device is increased, so that the sludge drying efficiency is improved, the dried sludge and tail gas are quickly discharged, and the sludge treatment capacity is ensured.

An outlet for discharging dried sludge and tail gas at the lower part of the cylinder body is connected with the recovery bin, the dried sludge is driven by the tail gas to be conveyed to the recovery bin, the dried sludge is stored in the recovery bin for further treatment, and the separated tail gas is discharged from the recovery bin and purified.

According to an example of the present invention, the sludge drying device further comprises a rotating shaft 301, the rotating shaft 301 is arranged in the housing along the longitudinal axis and is rotationally driven by means of a power input 302.

According to an example of the present invention, the sludge drying apparatus further comprises at least one sludge cutting assembly 3A, 3B, 3C, each comprising a rotating subassembly 31, 33, 35 and a

stationary subassembly

32, 34, 36. As shown in fig. 3, the rotation subassembly 31 includes at least one arm 351 and at least one first projection 352 provided on each arm 351, the arm 351 being connected to a sidewall of the rotation shaft 301 so as to rotate together with the rotation shaft 301. The fixation subassembly 32 includes a plurality of fixation rods 363 and at least one ring 361 supported by the plurality of fixation rods 363, the fixation rods 363 being secured at a first end to the barrel 202 and at a second end to a central ring 364 disposed about the rotational axis 301, the ring 361 having at least one second tab 362 disposed thereon.

According to one example of the invention, the at least one sludge cutting assembly comprises at least two sludge cutting assemblies, such as a first cutting assembly and a second cutting assembly, the first cutting assembly being located above the second cutting assembly, the gap between the two rings of the ring part of the first cutting assembly being larger than the gap between the two rings of the ring part of the second cutting assembly, i.e. the sludge is converted from bulk sludge, crushed bulk sludge to granular or granular sludge by the shearing/cutting of the first cutting assembly and the second cutting assembly. According to another example of the present invention, the at least one sludge cutting assembly comprises at least three sludge cutting assemblies. It should be understood that any suitable number of sludge cutting assemblies may be employed without departing from the scope of the present invention.

According to an example of the present invention, each of the rotating subassemblies 31 includes a plurality of arms 351 and a plurality of first protrusions 352 disposed on each of the arms 351 in a radial direction, each of the fixing subassemblies 32 includes a plurality of rings 361 alternately disposed in the radial direction with the plurality of first protrusions 352, and each of the rings 361 is provided with a plurality of second protrusions 362.

According to one example of the invention, the number of arms 351 of each rotating subassembly 31 is equal to the number of second tabs 362 on each ring 361. It should be understood that the number of arms 351 of each rotating subassembly 31 may also be different than the number of second tabs 362 on each ring 361, such as more than the number of second tabs 362 on each ring 361 or less than the number of second tabs 362 on each ring 361, without departing from the scope of the present invention.

According to one example of the present invention, each stationary subassembly 32 includes four

rings

361a, 361b, 361c, 361d, with five first tabs 352 provided on each arm 351. It should be understood that each fixed subassembly 32 may include more or fewer rings 361, with more or fewer first tabs 352 disposed on each arm 351.

According to one example of the present invention, the number of rings 361 per fixed subassembly 32 is equal to the number of first tabs 352 per arm 351. It should be understood that the number of rings 361 per fixed subassembly 32 may also be different than the number of first tabs 352 on each arm 351, such as 1 more than the number of first tabs 352 on each arm 351 or 1 less than the number of first tabs 352 on each arm 351, without departing from the scope of the present invention.

According to one example of the invention, the at least one sludge cutting assembly comprises at least a first sludge cutting assembly 3A and at least a second sludge cutting assembly 3B, the at least first sludge cutting assembly 3A being arranged on an upstream side of the at least second sludge cutting assembly 3B with respect to the sludge flow direction. According to one example of the invention, the gap between adjacent rings 361 of at least the first sludge cutting module 3A is a and the gap between adjacent rings 361 of at least the second sludge cutting module 3B is B, a ≧ B.

According to an example of the invention, the at least one sludge cutting assembly further comprises at least a third sludge cutting assembly 3C, the at least third sludge cutting assembly 3C being arranged on the downstream side of the at least second sludge cutting assembly 3B with respect to the sludge flow direction, the gap between adjacent rings 361 of the at least third sludge cutting assembly 3C being C, a ≧ B ≧ C.

In the example shown in fig. 1, the at least one sludge cutting assembly comprises three sludge cutting assemblies: a first sludge cutting assembly 3A, a second sludge cutting assembly 3B and a third sludge cutting assembly 3C. The number of the ring-shaped members 361 of the first sludge cutting assembly 3A is 2, and the number of the first projections 352 on each arm 351 of the first sludge cutting assembly 3A is 3, so that the ring-shaped members 361 and the first projections 352 are alternately arranged. Similarly, the number of rings 361 of the second sludge cutting assembly 3B is 3, and the number of first lugs 352 on each arm 351 of the second sludge cutting assembly 3B is 4, so that the rings 361 and the first lugs 352 are alternately arranged; the number of the ring 361 of the third sludge cutting assembly 3C is 4 and the number of the first lugs 352 on each arm 351 of the third sludge cutting assembly 3C is 5, so that the ring 361 and the first lugs 352 are alternately arranged.

It should be understood, however, that the at least one sludge cutting assembly may include any number of other sludge cutting assemblies, and that each sludge cutting assembly may include 3 or 4 rings 361, respectively, with the first tab 352 on each arm 351 being 1 more or 1 less than the rings 361, to ensure that the rings 361 and the first tabs 352 alternate, thereby effectively cutting the sludge. It should be understood that other numbers of rings 361 and first tabs 352 may be used without departing from the scope of this application.

The sludge cutting assembly of the present invention has the same configuration, the only difference being the number of rings and the number of shearing members (first projections 352) on the arms, and therefore, the present invention is described only with respect to the third sludge cutting assembly 3C. As shown in fig. 2-3, the rotation subassembly has at least one arm 351 having one end fixed to the rotation shaft and the other end extending outward in the radial direction. Three arms 351 are shown in fig. 2, but it should be understood that any other number of arms 351 may be included, such as, but not limited to, 1, 2, 4, 5, etc.

Further, it is easily understood that the first bump 352 is not necessarily required. In other embodiments, not shown, the arm 351 may not have any first protrusion. In some embodiments, not shown, the arm 351 may not have any cutting element, and a plurality of grooves corresponding to the ring 361 are formed on the lower surface of the arm 351, which is more advantageous for cutting sludge.

According to an example of the present invention, the thickness of at least one arm 351 is different from the thickness of the other arms 351, and the thickness affects the uniformity of the sludge moving during the rotation of the rotating subassembly, so that the sludge can be uniformly distributed on the annular member 361, and the efficiency of sludge shearing/cutting is improved. The arm 351 may be in the form of a paddle, post, elongated rod, but it should be understood that the arm 351 may be in any suitable form, and even the thickness of the arm 351 may vary from end to end, without departing from the scope of the present invention. The first bump 352 may be in the form of a bar, a cone, a square, a saw-tooth, a pillar in a cross section in a radial direction, but it should be understood that the first bump 352 may be in any other suitable form. The arm 351 and the first projection 352 may be integrally formed, or may be formed as separate members and fixed by means of bolts, caulking, welding, or the like.

The fixing subassembly 36 has a plurality of fixing rods 363 and at least one ring 361, the plurality of fixing rods 363 are disposed in the housing, one end of the plurality of fixing rods 363 is fixed to the cylinder 202, the other end thereof extends in a radial direction toward the longitudinal axis of the housing and is connected to the central ring, the at least one ring 361 is fixed to the plurality of supporting members 363, and the ring 361 may be provided with at least one second projection 362. The second projection 362 may be in the form of a strip, a cone, a square, a saw-tooth, a pillar in a cross section in the radial direction, but it should be understood that the second projection 362 may be in any other suitable form. The ring 361 and the second projection 362 may be integrally formed, or may be formed as separate members and fixed by bolts, rivets, welding, etc. to facilitate disassembly and replacement.

According to an example of the invention, each ring 361 is provided with a plurality of second cams 362. As shown in fig. 3, each ring 361 is provided with 3 second projections 362. It should be understood that each ring 361 may be provided with any other number of second tabs 362. Further, it should be understood that the number of second tabs 362 on each ring 361 may be the same or different for each sludge cutting assembly. For example, the number of second tabs 362 on a ring 361 closer to the longitudinal axis may be less than or equal to the number of second tabs 362 on a ring 361 further from the longitudinal axis. Further, the width of the second tab 362 on the ring 361 closer to the longitudinal axis may be less than or equal to the width of the second tab 362 on the ring 361 further from the longitudinal axis.

Furthermore, as shown in fig. 2 to 4, the upper surface of each annular member 361 may be provided with at least one second projection 362 uniformly or non-uniformly distributed in the circumferential direction, which helps to enhance the cutting effect on the sludge block. It is to be understood that the number and distribution of the second protrusions 362 shown in the drawings of the present application are only exemplary, and the present invention is not limited thereto, but the number and distribution of the second protrusions 362 may be selected as required by actual circumstances. A ring 361 is provided on the fixation rod 363 and all rings in each second subassembly are arranged concentrically with the central ring 364. In each second subassembly, the distance between adjacent annuli 361 is equal in the radial direction. It will be appreciated that the distance between adjacent annuli 361 may not be equal. In this way, the rings 361 form a grid below the first subassembly, making it possible to block the passage of larger sludge masses, allowing only sludge masses of a size smaller than the radial distance between adjacent rings 361 to pass, while the larger sludge masses are cut by the first subassembly. Referring to fig. 1, the distance between each ring 361 on the second subassembly may be the same or different from top to bottom, and may be adjusted according to actual needs, sludge properties, etc. to meet the needs of different water content or particle size. As shown in fig. 4, vertically from top to bottom, adjacent rings in the uppermost second subassembly 32 are spaced a greater distance apart, and adjacent rings in the lower second subassembly 34 of the uppermost second subassembly 32 are spaced a lesser distance apart. For example, in the embodiment shown in fig. 4, adjacent rings of second subassembly 32 have a spacing a therebetween, adjacent rings of second subassembly 34 have a spacing B therebetween, and adjacent rings of second subassembly 36 have a spacing C therebetween, spacing a being greater than spacing B, and spacing B being greater than spacing C. By providing a tapering spacing of adjacent rings from top to bottom, it is possible to progressively cut larger sludge masses entering the housing 2 into smaller sludge masses. Through the mode of cutting layer by layer from large to small at the intervals, the cutting effect on the sludge block can be enhanced, the contact area of hot air and the sludge block is increased as much as possible so as to improve the drying efficiency, and the blockage of the sludge passing path caused by the large sludge block is avoided. In another embodiment, the gap between the second protrusions 362 on the adjacent ring members may be the same as the gap between the adjacent ring members, or the gap between the protrusions on the adjacent ring members may be different according to actual needs, and the size of the first protrusion 352 on the first sub-assembly is adjusted according to the size of the second protrusion 362 on the adjacent ring members. In another embodiment, the second protrusions 362 of adjacent rings are offset or shifted from each other by a certain distance in the same horizontal plane or circumferential direction, however, the offset angle of the second protrusions of adjacent rings may be adjusted or set to be on the same horizontal plane according to the sludge property, water content, etc.

Returning again to fig. 1, the at least one sludge cutting assembly comprises three sludge cutting assemblies: the first sludge cutting assembly 3A, the second sludge cutting assembly 3B and the third sludge cutting assembly 3C are sequentially arranged inside the shell from top to bottom. As shown in fig. 4, the first stationary subassembly 32 of the first sludge cutting assembly 3A has two ring-shaped members 361 and a gap between the two ring-shaped members 361 is a, the second stationary subassembly 34 of the second sludge cutting assembly 3B has three ring-shaped members 361 and a gap between adjacent two ring-shaped members 361 is B, and the third stationary subassembly 36 of the third sludge cutting assembly has four ring-shaped members 361 and a gap between adjacent two ring-shaped members 361 is c. According to one example of the invention, a is more than or equal to b and more than or equal to c, so that the sludge is changed from block to granule or powder, and the requirements of the granularity and the water content of the sludge are met under the cooperation of drying.

As shown in fig. 1, the sludge cutting assemblies 3A, 3B, 3C respectively include rotating subassemblies 31, 33, 35 and

stationary subassemblies

32, 34, 36. At least one tab 362 is provided on the ring 361 of the

stationary subassembly

32, 34, 36, and at least one first tab 352 of at least one arm 351 of the rotating subassembly 31, 33, 35 is staggered with respect to at least one ring 361 of the

stationary subassembly

32, 34, 36, respectively. Each rotating subassembly 31, 33, 35 is rotatably positioned above a corresponding

stationary subassembly

32, 34, 36. It should be understood, however, that the rotating subassemblies 31, 33, 35 may also be positioned below the respective

stationary subassemblies

32, 34, 36, so long as the first projection 351 and the second projection 362 are disposed face-to-face without departing from the scope of this invention.

According to an example of the present invention, the sludge drying device further comprises a scraper 5 for scraping the bottom dried sludge to the outlet. The scraper 5 is positioned below the shell and fixedly connected with the rotating shaft 301. According to an example of the present invention, the scraper 5 is located below the at least one sludge cutting assembly 3A, 3B, 3C and is fixedly connected to the rotating shaft 301, and the scraper 5 has at least one scraper plate 501 extending outward from the rotating shaft to the vicinity of the cylinder in a radial direction, so as to scrape the dried sludge through the at least one scraper plate 501 and discharge the dried sludge from the outlet 205. In the example shown in fig. 6, the at least one scraper plate 501 is arranged at an angle of less than 90 degrees with respect to the base plate 206, preferably the at least one scraper plate 501 is arranged at an angle of between 40 degrees and 80 degrees with respect to the base plate 206. However, it should be understood that the at least one scraper plate 501 may be disposed at other angles relative to the base plate 206 without departing from the scope of the present invention. Furthermore, the at least one scraper plate 501 may take the form of a blade, however, it should be understood that the at least one scraper plate 501 may take other forms as well, such as a screen, to facilitate aeration of the sludge without departing from the scope of the present invention.

According to one example of the invention, a grinder 4 is provided inside the housing between the cutting assembly and the scraper. As shown in more detail in fig. 7-8, the grinder 4 has a rotatable cone 403 fixed to the rotating shaft and extending obliquely outward from top to bottom, and a grinding cover 402 extending obliquely outward from top to bottom outside the rotatable cone and provided with a fixing member 404 fixed to the cylindrical body at one end thereof, forming a sludge transporting passage between the rotatable cone and the grinding cover for grinding and transporting the dried sludge. Be equipped with from last to down to the slope of rotation axis center gradually and the bucket shape board 401 of convergence between cutting assembly and mill, the one end of bucket shape board is fixed on the barrel, the other end is fixed around the central opening who grinds the cover, cut/cut through cutting assembly after the mummification mud drop to bucket shape board and concentrate and collect rotatable cone-shaped and grind and form the mud conveying passageway entry between the cover, under the mutual rotation of rotatable cone-shaped and grinding cover, the mummification mud grinds at the mud conveying passageway, obtain required granularity, drop to scraper and export from the barrel from mud conveying passageway at last and discharge. The setting through the mill can guarantee the degree of consistency of mud granule, is favorable to the end to be dealt with, need not to carry out retreatment.

In another embodiment, only a grinder is arranged below the cutting assembly inside the shell, namely, sludge to be dried can be converted into dried sludge through the cutting assembly and the grinder without a scraper and directly discharged from the outlet of the cylinder.

The sludge drying apparatus of the present invention will be described next with reference to fig. 1.

First, the driving source connected to the power input 302 is turned on to rotate the power input 302, which in turn rotates the rotation shaft 301 and the sludge cutting assemblies 3A, 3B, 3C.

Sludge to be dried is supplied into the housing through the at least one inlet opening 203. The rotation of the rotation shaft 301 drives the rotation sub-assemblies 31, 33, 35 of each sludge cutting assembly 3A, 3B, 3C to rotate. As the at least one first cam 352 of the at least one arm 351 of the rotating sub-assembly 31, 33, 35 is staggered with respect to the second cam 362 on the at least one ring 361 of the

stationary sub-assembly

32, 34, 36, respectively, a sludge change from lumpy to granular or granular, and thus a sludge cut, is achieved. And (3) the sludge to be dried enters the first sludge cutting assembly 3A in the shell from the feed inlet 203, and under the action of the rotating subassembly 31 and the fixing subassembly 32 of the first sludge cutting assembly 3A, particles of which the sludge blocks are smaller than the gaps of the annular pieces 361 fall into the second sludge cutting assembly 3B and the third sludge cutting assembly 3C in sequence to form dried sludge.

At the same time, the dry gas medium is introduced from the at least one air inlet 204 by the air supply device and is extracted from the outlet 205 by the air inducing device, thereby reducing the moisture in the sludge.

In addition, the dried sludge falls to the hopper-shaped plate 401 after being cut/cut by the cutting assembly and is collected between the rotatable conical piece and the grinding cover in a centralized manner to form a sludge conveying channel inlet, and the dried sludge is ground in the sludge conveying channel under the mutual rotation of the rotatable conical piece and the grinding cover, so that the required granularity is obtained. The dried sludge after grinding falls to a scraper, at least one scraper plate 501 of the scraper 4 also rotates along with the rotating shaft 301 so as to scrape and sweep the dried sludge through the at least one scraper plate 501 and discharge the dried sludge from the outlet 205, and finally the dried sludge and tail gas are conveyed to a recovery bin through a draught fan or other sludge treatment and disposal devices for further treatment

The invention has been described in terms of certain preferred embodiments and variations thereon. Further modifications and alterations may occur to others upon reading and understanding the specification. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. A vertical sludge drying device comprises:

the sludge drying device comprises a shell, wherein the shell defines a longitudinal axis and is provided with at least one feed inlet for conveying sludge to be dried into the sludge drying device, at least one air inlet for conveying a drying gas medium into the sludge drying device and at least one outlet for discharging tail gas and dried sludge;

a rotating shaft disposed in the housing along the longitudinal axis and rotationally driven by a power input;

at least two sludge cutting assemblies configured to cut sludge falling thereon, reducing the size of the sludge, thereby facilitating drying;

the grinder is arranged below the sludge cutting assembly and is configured to grind sludge falling into the grinder so as to ensure the uniformity of sludge particles; and

the scraper is used for scraping and sweeping bottom dried sludge to the scraper at the outlet, the grinder is positioned between the cutting assembly and the scraper, the scraper is positioned below the shell and fixedly connected with the rotating shaft, and the scraper is provided with at least one scraper plate which extends outwards to the position near the barrel along the radial direction from the rotating shaft, so that the dried sludge is scraped and swept through the at least one scraper plate and is discharged from the outlet.

2. The sludge drying apparatus of claim 1, wherein the grinder comprises: a rotatable cone fixed to the rotating shaft; and a grinding cup disposed outside the cone.

3. The sludge drying device according to claim 2, wherein the grinder further comprises a hopper-shaped plate disposed between the cutting assembly and the grinding cover, the hopper-shaped plate having an upper end fixed to the barrel and a lower end fixed around an inlet of the grinding cover.

4. The sludge drying apparatus of any one of claims 1-3, wherein each sludge cutting assembly comprises a rotating sub-assembly and a stationary sub-assembly, the rotating sub-assembly comprising at least one arm and at least one first tab disposed on each arm, the arms being connected to a sidewall of the rotating shaft so as to rotate therewith, the stationary sub-assembly comprising a plurality of stationary rods and at least one ring supported by the plurality of stationary rods, the stationary rods being secured at a first end to the barrel and at a second end to a central ring disposed about the rotating shaft, the ring having at least one second tab disposed thereon.

5. The sludge drying device of claim 4, wherein the housing comprises an upper cover, a bottom plate and a cylinder, wherein the at least one inlet port is disposed in the upper cover, and the at least one outlet port is disposed in a lower portion of the cylinder.

6. The sludge drying device of claim 5, wherein the upper cover, the bottom plate and the barrel are integrally formed.

7. The sludge drying apparatus of any one of claims 1-3, wherein the at least one sludge cutting assembly comprises at least two sludge cutting assemblies.

8. The sludge drying device of claim 7, wherein each rotating sub-assembly comprises a plurality of arms and a plurality of first lugs disposed on each arm in a radial direction, each stationary sub-assembly comprises a plurality of rings alternating with the plurality of first lugs in the radial direction, and a plurality of second lugs are disposed on each ring.

9. The sludge drying apparatus of claim 8, wherein the number of arms of each rotating sub-assembly is equal to the number of second protrusions on each ring.

10. The sludge drying apparatus of claim 8, wherein at least one of the arms has a thickness different from the thickness of the other arms, thereby affecting the uniformity of sludge displacement during rotation of the rotating sub-assembly, and allowing uniform sludge distribution on the annular member.

11. The sludge drying device of claim 8, wherein the number of rings of each fixed sub-assembly is equal to or 1 more or less than the number of first lugs on each arm, such that the rings alternate with the first lugs.

12. The sludge drying apparatus of claim 4, wherein the at least one sludge cutting assembly comprises at least a first sludge cutting assembly and at least a second sludge cutting assembly, the at least first sludge cutting assembly being disposed upstream of the at least second sludge cutting assembly with respect to a sludge flow direction.

13. The sludge drying apparatus of claim 12, wherein the at least one sludge cutting assembly further comprises at least a third sludge cutting assembly disposed downstream of the at least a second sludge cutting assembly with respect to a direction of sludge flow.

14. The shaft-ventilated sludge drying device of claim 13, wherein the gap between adjacent ring-shaped members of at least the first sludge cutting assembly is a, the gap between adjacent ring-shaped members of at least the second sludge cutting assembly is b, and the gap between adjacent ring-shaped members of at least the third sludge cutting assembly is c, and a is greater than or equal to b and greater than or equal to c.

15. The sludge drying apparatus of any one of claims 1 to 3, wherein the sludge drying apparatus further comprises: an air supply device that delivers a dry gas medium to at least one air inlet; and an air inducing device disposed downstream of the outlet.

16. A method of operating a sludge drying apparatus as claimed in any one of claims 1 to 15, comprising: