CN112479544A

CN112479544A - Vertical sludge drier and method for drying sludge by using same

Info

Publication number: CN112479544A
Application number: CN201910865477.9A
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

Abstract

The invention provides a vertical sludge drier which comprises a shell and a shaft which are arranged along the vertical direction. The shell comprises a feeding hole, an air inlet and a discharging air outlet. The shaft is supported in the housing and arranged such that its longitudinal centerline coincides with the longitudinal centerline of the housing. The shaft is rotatable. And a power transmission device is arranged at the upper end or the lower end of the shaft. At least two groups of cutting assemblies are arranged along the shaft to cut sludge blocks entering the barrel body from the feed inlet. The invention also provides a method for drying sludge by using the vertical sludge drying machine.

Description

Vertical sludge drier and method for drying sludge by using same

Technical Field

The invention relates to the field of sludge treatment in a sewage treatment process, in particular to a vertical sludge drier and a method for drying sludge by using the vertical sludge drier.

Background

With the continuous development of urbanization, the amount of sewage generated in industrial production and life and requiring purification treatment is gradually increased, and the output of sludge, which is a byproduct of sewage purification treatment, is also increased. Sludge treatment is more difficult than sewage treatment. At present, sewage plants generally adopt a concentration and dehydration method to carry out early treatment on sludge so as to reduce the water content of the sludge from more than 90 percent to about 60 to 80 percent; the pre-treated sludge is then typically landfilled, composted and dried. Among the above treatments, the drying treatment of the sludge is an effective treatment method, which can not only avoid secondary pollution caused by fermentation of the sludge, but also facilitate the end treatment of the treated dried sludge.

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. In this mud low temperature heat drying equipment, the material on the first tray drops to the second tray from between first tray and the first cylinder type shells inner wall downwards under the stirring of first carousel on to stir the material on the second tray by second blade and stirring tooth, then from the blanking hole whereabouts of second tray, the material is being stirred and the in-process of whereabouts, with through dry blower drum-in, carry out the heat exchange by the dry hot-blast after the gas distribution dish cloth gas, 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, leads to the moisture content scheduling problem not up to standard.

Accordingly, there is a continuing need in the art for improvements in sludge drying apparatus that allow for smaller footprint, higher drying efficiency and higher throughput, thereby being suitable for rapid batch industrial processing and application of sludge.

Disclosure of Invention

The invention provides a vertical sludge drier which adopts vertical arrangement, thereby greatly reducing the required floor area and reducing the equipment cost. In addition, the vertical sludge drying machine does not need a special sludge conveying device and can comprise a cutting device so as to cut larger sludge blocks, increase the contact specific surface area of hot air and the sludge blocks and improve the drying efficiency.

The vertical sludge drying machine comprises a shell, wherein the shell forms an inner space for accommodating an inner structure and receiving a sludge block, and the shell comprises an upper cover, a cylinder body and a bottom plate. The upper cover includes a shaft hole at a center thereof, and the base plate includes a shaft hole at a center thereof; and the cylinder body is formed in a cylindrical shape with both ends open, the upper cover is connected to and covers the opening at the upper end of the cylinder body, and the bottom plate is connected to and covers the opening at the lower end of the cylinder body. When assembled together, the centers of both the shaft hole of the upper cover and the shaft hole of the bottom plate are located on the longitudinal center line of the cylinder body. The upper part of the shell is provided with: the feeding hole is used for feeding sludge blocks into the shell; and the air inlet is used for introducing drying medium gas into the shell so as to dry the sludge block in the shell. In addition, a discharging air outlet is arranged at the lower part of the shell and used for discharging the dried sludge block and the dried tail gas from the shell together. The vertical sludge drying machine further comprises a shaft which can rotate around the longitudinal center line of the shaft and is arranged along the vertical direction to enable the longitudinal center line of the shaft to coincide with the longitudinal center line of the barrel body, the lower end of the shaft passes through the shaft hole of the bottom plate and is rotatably supported in the shaft hole of the bottom plate, and the upper end of the shaft passes through the shaft hole of the upper cover and is rotatably supported in the shaft hole of the upper cover. A power transmission device is provided at an upper end or a lower end of the shaft for transmitting power to the shaft to rotate the shaft. At least two sets of cutting assemblies are arranged along the shaft, each set of cutting assemblies including a rotating subassembly including at least one cantilever having one end fixedly connected to the shaft for rotation therewith to cut a mass of sludge entering the barrel from the feed inlet.

In a further embodiment, the feed opening is arranged in the upper cover or in the upper part of the barrel.

In a further embodiment, the cutting assembly further comprises a stationary subassembly fixedly connected to the shaft and located below the rotating subassembly so as to intercept a larger sludge mass to enable it to be cut by the at least one cantilever. In another embodiment, the fixing subassembly includes a center ring fitted over the shaft without contacting the shaft, at least one support arm, each of the at least one support arms having one end fixedly connected to the center ring and an opposite end fixedly connected to the barrel, and at least two ring members fixedly connected to an upper surface of the at least one support arm and arranged concentrically with the shaft around the shaft with equal spacing in a radial direction between any two adjacent ring members. It will be appreciated that the radial spacing between any two adjacent annular members may not be equal. In another embodiment, each annular member includes at least one projection projecting upwardly from an upper surface thereof, the at least one projection being circumferentially arranged.

In a further embodiment, each of the at least one cantilever arms is provided with at least one cutting member fixedly connected to a lower surface of the cantilever arm and extending downwardly from the lower surface to between two adjacent ring members of the corresponding fixed subassembly, the at least one cutting member being radially alternately spaced from the at least two ring members. In another embodiment, the radial spacing between any two adjacent ring members of the fixed subassemblies of the at least two cutting assemblies decreases in a direction from the top cover to the bottom plate. In another embodiment, the vertical dryer includes three cutting assemblies.

In further embodiments, the air inlet is provided in the upper cover, and a longitudinal central axis of the air inlet may be perpendicular to the upper cover. In further embodiments, the air inlet is provided at an upper portion of the barrel, and a longitudinal center axis of the air inlet perpendicularly intersects the longitudinal center axis of the barrel. In a further embodiment, the gas inlet is arranged with its longitudinal centre line radially offset with respect to the longitudinal centre line of the shaft by a distance such that the drying medium gas is introduced into the shaft in a direction tangential to the shaft. In a further embodiment, the outfeed air outlet is arranged in the floor, and the longitudinal central axis of the outfeed air outlet can be perpendicular to the floor. In another embodiment, the air outlet is arranged at the lower part of the barrel, and the longitudinal central axis of the air outlet is perpendicularly intersected with the longitudinal central axis of the barrel. In another embodiment, the discharge outlet is arranged with its longitudinal centre line radially offset with respect to the longitudinal centre line of the shaft by a distance such that dried sludge mass and the dried tail gas are discharged from the housing in a direction tangential to the shaft. In another embodiment, the inner surface of the barrel is provided with a gas flow guide arranged along a spiral line for guiding the drying medium gas to flow along the path of the spiral line in the barrel. In further embodiments, the vertical sludge drying apparatus further comprises a blower in fluid communication with the air inlet for delivering drying medium gas to the air inlet; and the induced draft fan is arranged at the downstream of the discharging air outlet and is communicated with the fluid of the discharging air outlet.

In a further embodiment, the barrel comprises, from top to bottom, a first section and a second section, wherein the volume of the second section is greater than the volume of the first section. In yet another embodiment, the shaft may have a frustoconical shape such that the area of a cross-section of the shaft perpendicular to the longitudinal central axis increases gradually from top to bottom along the longitudinal central axis thereof such that the volume of a lower portion of the shaft is greater than the volume of an upper portion thereof.

In a further embodiment, the barrel comprises, from top to bottom, a first section and a second section, wherein the volume of the second section is less than the volume of the first section. In yet another embodiment, the shaft may have an inverted frusto-conical shape such that the area of a cross-section of the shaft perpendicular to the longitudinal central axis decreases from top to bottom along its longitudinal central axis such that the volume of the lower portion of the shaft is less than the volume of the upper portion thereof.

In a further embodiment, the power transmission means is a gear, sprocket or pulley, which is keyed or splined on the shaft for transmitting power to the shaft.

In further embodiments, the vertical sludge dryer comprises a first cutting assembly and a second cutting assembly, the first cutting assembly being disposed above the second cutting assembly with respect to a sludge flow direction.

In further embodiments, the vertical sludge dryer includes a third cutting assembly disposed below the second cutting assembly with respect to the direction of sludge flow.

In other embodiments, the distance between adjacent ring-shaped members of the first cutting assembly is A, the distance between adjacent ring-shaped members of the second cutting assembly is B, the distance between adjacent ring-shaped members of the third cutting assembly is C, and A is greater than or equal to B and greater than or equal to C.

The invention also provides a method for drying sludge by using the vertical sludge drying machine, which comprises the following steps: introducing the sludge mass into the shell via the feed inlet; introducing the drying medium gas into the housing via the gas inlet to dry the sludge mass in the housing; delivering power to the shaft via a power transmission device to rotate the shaft so as to dry the sludge block and simultaneously cut the sludge block by the cutting assembly; and discharging the dried sludge block and the dried tail gas from the shell together through the discharge air outlet.

Drawings

The foregoing and other objects, features and advantages of the invention will be more fully appreciated and understood from the following detailed description of the preferred embodiments of the invention, taken in conjunction with the accompanying drawings. It should be understood that the drawings herein are not to scale in order to clearly show the contents thereof. In the drawings:

FIG. 1 schematically illustrates, in longitudinal cross-section, a vertical sludge dryer according to an embodiment of the present invention;

FIG. 2 schematically illustrates in perspective view a housing of the vertical sludge dryer of FIG. 1;

FIG. 3 is a perspective cutaway view of the housing shown in FIG. 2; and

FIG. 4 schematically illustrates, in perspective view, another embodiment of the housing of the vertical sludge dryer of FIG. 1;

FIG. 5 schematically illustrates, in perspective view, a cutting assembly of the vertical sludge dryer of FIG. 1;

FIG. 6 is an exploded perspective view of the cutting assembly shown in FIG. 5;

FIG. 7 schematically illustrates in perspective view the stationary sub-assemblies of the three cutting assemblies of the vertical sludge dryer of FIG. 1, wherein the radial spacing between two adjacent annular members of each stationary sub-assembly is shown;

FIG. 8 schematically illustrates in perspective view a rotating subassembly of the cutting assembly of the vertical sludge dryer of FIG. 1; and

fig. 9 is a flow chart showing a method for drying sludge by using the vertical sludge drying machine according to the invention.

Throughout the drawings, identical or similar elements, components and/or parts are indicated by identical reference numerals.

Detailed Description

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. 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. Further, the steps included in the methods described herein are exemplary in nature and they do not necessarily have to be performed in the order listed, but rather one or more of the steps may be performed in a different order or simultaneously, as the case may be. Furthermore, the described method may comprise further additional steps, depending on the actual situation.

Technical features included in the respective embodiments described in the present application can be arbitrarily combined without departing from the technical principle, and technical solutions obtained by the combination should also be considered to fall within the scope of the present invention.

For the purpose of clarity, certain techniques, structures, materials, and so forth known in the art to which this invention pertains have not been described in detail so as not to obscure the application.

Referring to fig. 1, a vertical sludge drying machine 1 according to one embodiment of the present invention is shown in a longitudinal cutaway view. The vertical sludge drier 1 comprises a shell 2, a shaft 301, a first cutting assembly 3A, a second cutting assembly 3B and a third cutting assembly 3C. The housing 2 and the shaft 301 are both arranged in the vertical direction. The housing 2 forms an inner space for accommodating the inner structure and receiving the sludge blocks, and the shaft 301 is rotatably supported in the housing 2, so as to drive the rotatable components in the first, second and

third cutting assemblies

3A, 3B and 3C to rotate, so that the sludge in the housing 2 can be dried and the larger sludge blocks can be cut.

It should be noted that the descriptions of the orientations such as "upper", "lower", "upper" and "lower" mentioned in the present application refer to the installation arrangement of the vertical sludge drying machine 1 during normal use, for example, the installation arrangement of the vertical sludge drying machine 1 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.

With continued reference to fig. 1 and with combined reference to fig. 2 and 3, the housing 2 may be formed from any suitable material, such as a suitable metallic material, for example, steel. The housing 2 includes an upper cover 201, a barrel 202, and a bottom plate 206 in this order from top to bottom, and the housing 2 is arranged vertically, that is, a longitudinal central axis 2a of the housing 2 (or, also, a longitudinal central axis of the barrel 202) is perpendicular to a horizontal ground in a direction of gravity. Barrel 202 is formed in a cylindrical shape with both ends open, and upper cover 201 can be attached to and cover the opening at the upper end of barrel 202 in any known suitable manner, including but not limited to, for example, welding, riveting, screwing, etc.; base 206 can be attached to and close the opening at the lower end of barrel 202 in any known suitable manner, including but not limited to, for example, welding, riveting, screwing, and the like. In the embodiment shown in fig. 1, 2, 3, shaft 202 has a cylindrical shape, i.e., the shape of a cross-section of shaft 202 perpendicular to its longitudinal central axis 2a is circular. However, the cross-sectional shape of barrel 202 may have any suitable other shape including, but not limited to, triangular, rectangular, square, regular polygonal, etc. When the barrel 202 has other cross-sectional shapes, the shapes of the upper cover 201 and the bottom plate 206 are changed accordingly so as to fit the openings of the upper and lower ends of the barrel 202, respectively. It is noted that it may be advantageous to use a regular polygon for the cross-sectional shape of barrel 202, because in this manner multiple flat plates can be used to form a barrel having a larger cross-sectional area. This is very cost effective for barrel 202 requiring a larger cross-sectional shape to be formed.

The upper part of the barrel 202 is provided with an air inlet 204 for introducing a drying medium gas into the housing 2 for drying the sludge mass in the housing 2. In the embodiment shown in fig. 1, 2, 3 and 4, the air inlet 204 is arranged such that its longitudinal central axis 204a perpendicularly intersects the longitudinal central axis 2a of the barrel 202. However, it is also possible that the longitudinal center axis 204a of the air inlet 204 is offset a distance in the radial direction with respect to the longitudinal center axis 2a of the barrel 202. In one embodiment, longitudinal central axis 204a of gas inlet 204 can be arranged tangentially to barrel 202 such that the drying medium gas can be introduced into barrel 202 in a direction tangential to barrel 202. In another embodiment, the longitudinal central axis 204a of the air inlet 204 may be arranged not perpendicular to the longitudinal central axis 2a of the barrel 202. In the embodiment shown in fig. 2, 3 and 4, the cross-section of the air inlet 204 perpendicular to its own longitudinal central axis 204a is rectangular in shape, but the cross-section may be provided in other shapes including, but not limited to, circles, triangles, squares, polygons, and the like.

It is easily understood that the air inlet 204 may also be provided in the upper cover 201. In this case, the air inlet 204 may be disposed such that its longitudinal central axis 204a is perpendicular to the upper lid 201 or not perpendicular to the upper lid 201.

The lower part of the barrel 202 is provided with a discharging air outlet 205 for discharging dried sludge blocks and dried tail gas from the shell 2. In the embodiment shown in fig. 1, 2, 3 and 4, the outfeed air outlet 205 is arranged with its longitudinal central axis 205a perpendicularly intersecting the longitudinal central axis 2a of the barrel 202. However, it is also possible for the longitudinal central axis 205a of the outlet mouth 205 to be offset by a certain distance in the radial direction with respect to the longitudinal central axis 2a of the shaft 202. In one embodiment, a longitudinal central axis 205a of the outfeed air outlet 205 may be arranged tangential to the shaft 202, such that the dried tail gas and the dried sludge can be discharged together from the shaft 202 in a direction tangential to the shaft 202. In the embodiments shown in fig. 1, 2, 3 and 4, the cross-section of the outfeed air outlet 205 perpendicular to its longitudinal central axis 205a is rectangular in shape, but the cross-section may also be provided in other shapes, including but not limited to circular, triangular, square, polygonal, etc.

It will be readily appreciated that the outlet vent 205 may also be provided in the floor 206. In this case, the outlet mouth 205 can be arranged such that its longitudinal central axis 205a is perpendicular to the floor 206 or not perpendicular to the floor 206.

As shown in fig. 1, the air inlet 204 is communicated with an air blower for conveying a drying medium gas, and the discharge air outlet 205 is communicated with a recovery bin for receiving dried sludge, and the recovery bin may be communicated with an induced draft fan to help conveying the dried sludge and the dried tail gas discharged from the discharge air outlet 205 to the recovery bin. It is to be understood that the connection combination shown in fig. 1 is only an exemplary connection combination of the vertical sludge drying machine 1 according to the present invention and other devices or apparatuses. The present invention is not limited to the connection combination shown in fig. 1, but any suitable upstream and downstream devices or apparatuses may be connected according to actual needs.

The upper cover 201 has a shaft hole 201a at the center thereof to receive and support the upper end of the shaft 301 of the vertical sludge drier 1. The upper cover 201 is also provided with a feed inlet 203 for receiving sludge. However, it is understood that the feed opening 203 may be disposed on the barrel 202, for example, at a suitable position on the upper portion of the barrel 202. The bottom plate 206 has a shaft hole 206a at the center thereof to receive and support the lower end of the shaft 301 of the vertical sludge drying machine 1. When assembled with the barrel 202, the centers of both the shaft hole 201a of the upper cover 201 and the shaft hole 206a of the bottom plate 206 are located on the longitudinal center axis 2a of the barrel 202.

Fig. 4 shows another embodiment of the housing 2 of the vertical sludge dryer 1 in a perspective cut view. In this embodiment, the housing 2 also includes, in order from top to bottom, an upper cover 201, a barrel 202, and a bottom plate 206. In this embodiment, however, the barrel 202 includes a first portion 202a and a second portion 202b, wherein the first portion 202a is disposed above the second portion 202b and the volume of the second portion 202b is greater than the volume of the first portion 202 a. For the embodiment shown in fig. 4, both first portion 202a and second portion 202b have a cylindrical shape, so the inner diameter of the cylinder of second portion 202b is greater than the inner diameter of the cylinder of first portion 202 a. Because the lower part of the shell 2, namely the second part 202b shown in fig. 4, has a larger volume, it can play a role of buffering dried sludge, and increase the retention time of the sludge in the vertical sludge drying machine 1, thereby improving the drying efficiency. However, it is also feasible that the volume of the first portion 202a is smaller than the volume of the second portion 202 b. Furthermore, in an embodiment not shown, shaft 202 has a frustoconical shape such that, from top to bottom along its longitudinal central axis 2a, the area of the cross section of shaft 202 perpendicular to said longitudinal central axis 2a increases gradually. Thereby, the barrel 202 is also made to have a larger volume in the lower portion thereof. In another embodiment, not shown, shaft 202 has an inverted frusto-conical shape such that the area of the cross-section of shaft 202 perpendicular to longitudinal central axis 2a decreases from top to bottom along longitudinal central axis 2a thereof.

With continued reference to fig. 1, a shaft 301 is vertically disposed in the housing 2 of the vertical sludge drying machine 1, with its upper end passing through the shaft hole 201a of the upper cover 201 and rotatably supported in the shaft hole 201a by a corresponding bearing device, and with its lower end passing through the shaft hole 206a of the bottom plate 206 and rotatably supported in the shaft hole 206a by a corresponding bearing device, so that the longitudinal central axis 301a of the shaft 301 coincides with the longitudinal central axis 2a of the barrel 202. The shaft 301 is mounted at its upper end with a power transmission device 302 for transmitting power from an external power source to the shaft 301 to rotate it about its longitudinal central axis 301 a. It will be readily appreciated that the power transmission means may also be mounted on the lower end of the shaft 301. Further, the power transmission means 302 may be, for example, a gear, a sprocket, a pulley, or the like, which is mounted on the upper or lower end of the shaft 301 in a splined or splined manner or any other suitable manner for transmitting power to the shaft 301.

At least one cutting assembly can be arranged in the shell 2 of the vertical sludge drier 1 and used for cutting larger sludge blocks entering the shell 2 into smaller sludge blocks, so as to be beneficial to drying the sludge blocks by using drying medium gas. In the embodiment shown in fig. 1, three cutting assemblies, i.e., a first cutting assembly 3A, a second cutting assembly 3B and a third cutting assembly 3C, are arranged in the housing 2 from top to bottom in a vertical direction (that is, in a flow direction of sludge in the vertical sludge drying machine 1). It will be readily appreciated that any other number of cutting assemblies are possible. Each of the first, second and

third cutting assemblies

3A, 3B and 3C comprises a rotating sub-assembly rotating together with the shaft 301 to cut the sludge mass and a stationary sub-assembly fixedly mounted to the barrel 202 and vertically disposed below the rotating sub-assembly to intercept the larger sludge mass so that it can be cut by the rotating sub-assembly.

Referring to fig. 5 and 6, fig. 5 shows the third cutting assembly 3C in a perspective view, and fig. 6 shows the components of the third cutting assembly 3C in an exploded perspective view. The rotating subassembly of the third cutting assembly 3C comprises three cantilevers 351 evenly spaced apart in the circumferential direction, wherein one end of each cantilever 351 is fixedly connected to the shaft 301 in a suitable manner, including but not limited to, for example, welding, riveting, screwing, etc., and the cantilevers 351 extend radially outward from the shaft 301. As shown in the figures, the cross-section of the cantilever 351 perpendicular to its own longitudinal central axis has a rectangular shape, but it is readily understood that the cross-section may have any other suitable shape, including but not limited to, for example, circular, elliptical, square, triangular, polygonal, and the like. Furthermore, it is readily understood that the rotating subassembly may also comprise any other number of cantilevers, e.g. one, two, four, etc., and that these cantilevers may also be arranged at non-uniform intervals in the circumferential direction. At least one cutting member 352 may be provided on each cantilever 351 to increase a contact area with the sludge mass, thereby enhancing a cutting effect on the sludge mass. In the embodiment shown in fig. 5, 6 and 8, five cutters 352 are provided at each cantilever 351. Each cutting member 352 is fixedly attached to the lower surface of the cantilever 351 in a suitable manner, including but not limited to, for example, welding, riveting, screwing, etc., and extends vertically downward perpendicular to the lower surface. The cutting member 352 may be, but is not limited to, a strut, a cutter, etc. in a suitable form. Referring particularly to fig. 8, there is shown in perspective a rotary subassembly mounted on the shaft 301, the rotary subassembly comprising three cantilever arms 351, each cantilever arm 351 being provided with 5 cutting members 352. In some embodiments according to the invention, the cutting member may be integrally formed with the cantilever arm. Further, it is readily understood that the cutting member 352 is not required. In other embodiments, not shown, the cantilever 351 may not have any cutting element disposed thereon. In some embodiments, not shown, the cantilever 351 may not have any cutting member, and the lower surface of the cantilever 351 may have a plurality of grooves corresponding to the annular member 361, which is more advantageous for cutting the sludge mass.

Referring to fig. 7, there is shown the stationary subassembly 32 of the first cutting assembly 3A, the stationary subassembly 34 of the second cutting assembly 3B and the stationary subassembly 36 of the third cutting assembly 3C, wherein each stationary subassembly comprises a central ring 364, three support arms 363 fixedly connected to said central ring 364, and a plurality of ring members 361 attached to the upper surfaces of the support arms 363. It will be readily appreciated that the support arms 363 can have any other suitable number, e.g., one, two, four, etc.; likewise, the annular member 361 could have any other suitable number. When installed in the vertical sludge dryer 1, the centering ring 364 may be fitted over the shaft 301, but does not contact the shaft 301. One end of the support arm 363 is fixedly attached to the center ring 364 by suitable means including, but not limited to, for example, welding, riveting, threading, etc., and the other end thereof is fixedly attached to the barrel 202 by suitable means including, but not limited to, for example, welding, riveting, threading, etc. Thereby, the support arm 363 can support the ring member 361 attached to the upper surface thereof. As shown in the figures, the cross-section of the support arm 363 perpendicular to its own longitudinal central axis has a rectangular shape, but it is readily understood that the cross-section may have any other suitable shape, including but not limited to, for example, circular, oval, square, triangular, polygonal, and the like.

The upper surface of each annular member 361 may also be provided with at least one projection 362, distributed uniformly or non-uniformly in the circumferential direction, which contributes to an enhanced cutting effect of the sludge mass. It is to be understood that the number and distribution of the bumps 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 bumps 362 may be selected as required by the actual situation. A ring member 361 is provided on the support arm 363, and all ring members in each fixation subassembly are arranged concentrically with the central ring 364. In each of the stator sub-assemblies, the distance between adjacent annular members 361 is equal in the radial direction. It will be appreciated that the distance between adjacent annular members 361 may be unequal. In this way, the annular members 361 form a grid below the rotating assembly, making it possible to block the passage of larger sludge masses, allowing only sludge masses having dimensions smaller than the radial distance between adjacent annular members 361 to pass, while the larger sludge masses are cut by the rotating sub-assembly. Referring to fig. 1 and 7, the vertical sludge drying machine 1 includes three cutting assemblies, a first cutting assembly 3A, a second cutting assembly 3B and a third cutting assembly 3C from top to bottom in the vertical direction, the first cutting assembly 3A is disposed above the second cutting assembly 3B with respect to the sludge flow direction, and the third cutting assembly 3C is disposed below the second cutting assembly 3B with respect to the sludge flow direction. The spacing between each annular part 361 on each cutting assembly can be the same or different, and the spacing can be adjusted correspondingly according to actual needs, sludge properties and the like so as to meet the needs of different water content or granularity. The adjacent ring-shaped parts in the fixed sub-assembly of the cutting assembly located above have a larger spacing, and the adjacent ring-shaped parts in the fixed sub-assembly of the cutting assembly located below have a smaller spacing. For example, in the embodiment shown in fig. 1 and 7, adjacent ring members in the fixed sub-assembly 32 of the first cutting assembly 3A have a spacing a therebetween, adjacent ring members in the fixed sub-assembly 34 of the second cutting assembly 3B have a spacing B therebetween, and adjacent ring members in the fixed sub-assembly 36 of the third cutting assembly 3C have a spacing C therebetween, the spacing a being equal to or greater than the spacing B, and the spacing B being equal to or greater than the spacing C. By providing a tapering spacing of adjacent annular members 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 lugs 362 on adjacent ring members may be the same as the gap between adjacent ring members, but the lug gaps on adjacent ring members may be different according to actual needs. The size of the cutting element 352 provided on the rotary subassembly can be adjusted according to the tab clearance and tab 362 size on the adjacent ring component. In another embodiment, the lugs 362 on adjacent annular members are on the same horizontal plane, or may be offset or offset from each other in the circumferential direction by a certain distance, however, the offset angle of the lugs on adjacent annular members may be adjusted or the lugs may be disposed on the same horizontal plane according to the sludge property, water content, etc.

When having a cutting member 352, as shown in fig. 5, the cutting member 352 on the cantilever arm 351 is alternately radially spaced from the annular member 361 on the support arm 363 when the rotating and stationary subassemblies of the cutting assembly are assembled together. The structure is beneficial to cutting the sludge blocks, so that the drying medium gas can better dry the sludge.

In another not shown embodiment of the invention, the gas inlet 204 is arranged radially offset a distance with respect to the longitudinal central axis 2a of the shaft 202, for example may be tangential to the shaft 202, so that the drying medium gas is introduced into the housing 2 in a direction tangential to the shaft 202, and the inner surface of the shaft 202 may be further provided with a gas flow guide arranged along a spiral line, so that the drying medium gas flows along a spiral flow path within the housing 2. Such an arrangement may be advantageous because the flow of the drying medium gas in the form of a spiral in the housing 2 amounts to an increased flow path of the drying medium gas in the housing 2, thereby facilitating drying of the sludge cake by the drying medium gas.

Referring now to fig. 9, a method 400 for drying sludge using a vertical sludge dryer according to the present invention is shown. In step 401, a sludge mass is introduced into the housing 202 via the feed opening 203; at step 402, introducing a drying medium gas into the housing 202 via the gas inlet 204 to dry the sludge mass in the housing 202; in step 403, power is transmitted to the shaft 301 via the power transmission device 302 to rotate the shaft so as to dry the sludge block and cut the sludge block by the first, second and

third cutting assemblies

3A, 3B and 3C; and, in step 404, discharging the dried sludge block together with the dried tail gas from the housing 202 through the discharging air outlet 205.

While the present invention has been described above by way of some specific embodiments thereof, it is to be understood that the embodiments herein are to be considered as illustrative and not restrictive, and that the features of the embodiments disclosed herein can be configured and/or combined in any suitable configuration or combination. Accordingly, the invention is not limited to the details provided herein, but may be modified within the scope of the disclosure, and all such modifications are intended to be within the scope of the disclosure.

Claims

1. A vertical sludge drier comprises:

a housing, the casing forms the inner space who holds inner structure and receive the mud block, the casing includes upper cover, stack shell and bottom plate, wherein:

the upper cover includes a shaft hole at the center thereof,

the base plate includes a shaft hole at a center thereof; and

the cylinder body is formed in a cylindrical shape with both ends open, the upper cover is connected to and covers the opening at the upper end of the cylinder body, the bottom plate is connected to and closes the opening at the lower end of the cylinder body, and when the cylinder body and the bottom plate are assembled together, the centers of the shaft hole of the upper cover and the shaft hole of the bottom plate are both positioned on the longitudinal center line of the cylinder body;

the feeding hole is formed in the upper portion of the shell and used for enabling a sludge block to enter the shell;

a shaft rotatable about a longitudinal center line thereof and arranged in a vertical direction such that the longitudinal center line thereof coincides with the longitudinal center line of the barrel, a lower end of the shaft passing through and being rotatably supported in the shaft hole of the bottom plate, and an upper end of the shaft passing through and being rotatably supported in the shaft hole of the upper cover;

a power transmission device provided at an upper end or a lower end of the shaft, for transmitting power to the shaft to rotate the shaft;

at least two sets of cutting assemblies arranged along the shaft, each set of cutting assemblies comprising a rotating subassembly comprising at least one cantilever having one end fixedly connected to the shaft for rotation therewith to cut a mass of sludge entering the barrel from the feed inlet;

the air inlet is arranged at the upper part of the shell and is used for introducing a drying medium gas into the shell so as to dry the sludge blocks in the shell; and

and the discharging air outlet is arranged at the lower part of the shell and is used for discharging the dried sludge block and the dried tail gas together from the shell.

2. The vertical sludge drying machine according to claim 1, wherein the feed inlet is arranged in the upper cover or in the upper part of the barrel body.

3. The vertical sludge dryer according to claim 1, wherein the cutting assembly further comprises a stationary subassembly fixedly connected to the shaft and located below the rotating subassembly so as to intercept a larger sludge mass so that it can be cut by the at least one cantilever.

4. The vertical sludge drying machine according to claim 3, wherein the fixing sub-assembly comprises a center ring, at least one support arm and at least two ring-shaped members, the center ring is sleeved on the shaft but does not contact the shaft, one end of each support arm of the at least one support arm is fixedly connected to the center ring and the opposite end thereof is fixedly connected to the barrel, the at least two ring-shaped members are fixedly connected to the upper surface of the at least one support arm and are arranged to surround the shaft concentrically with the shaft.

5. The vertical sludge drying machine according to claim 4, wherein each annular member comprises at least one projection projecting upwardly from an upper surface thereof, the at least one projection being arranged circumferentially.

6. The vertical sludge drying machine according to claim 4, wherein each of the at least one cantilever arms is provided with at least one cutting member fixedly connected to a lower surface of the cantilever arm and extending downwardly from the lower surface to between two adjacent annular members in the corresponding fixed sub-assembly, the at least one cutting member being radially alternately spaced from the at least two annular members.

7. The vertical sludge drying machine according to claim 1, comprising a first cutting assembly and a second cutting assembly, wherein the first cutting assembly is disposed above the second cutting assembly with respect to a sludge flow direction.

8. The vertical sludge drying machine according to claim 7, comprising a third cutting assembly disposed below the second cutting assembly with respect to the sludge flow direction.

9. The vertical sludge drying machine according to claim 8, wherein the distance between the adjacent ring-shaped members of the first cutting assembly is A, the distance between the adjacent ring-shaped members of the second cutting assembly is B, the distance between the adjacent ring-shaped members of the third cutting assembly is C, and A is not less than B and not less than C.

10. The vertical sludge drying machine according to claim 1, wherein the air inlet is arranged at the upper part of the cylinder body, and the longitudinal central axis of the air inlet is vertically intersected with the longitudinal central axis of the cylinder body.

11. The vertical sludge drying machine according to claim 1, wherein the gas inlet is provided at an upper portion of the shaft and is arranged such that a longitudinal centerline of the gas inlet is radially offset with respect to a longitudinal centerline of the shaft by a distance such that the drying medium gas is introduced into the shaft in a direction tangential to the shaft.

12. The vertical sludge drying machine according to claim 1, characterized in that:

the air inlet is arranged in the upper cover; and/or

The discharging air outlet is arranged in the bottom plate.

13. The vertical sludge drying machine according to claim 1, wherein the air outlet is arranged at the lower part of the barrel body, and the longitudinal central axis of the air outlet is vertically intersected with the longitudinal central axis of the barrel body.

14. The vertical sludge drying machine according to claim 1, wherein the discharge air outlet is arranged to have its longitudinal centerline radially offset a distance relative to the longitudinal centerline of the shaft such that dried sludge mass and dried tail gas are discharged from the housing in a direction tangential to the shaft.

15. The vertical sludge drying apparatus of claim 1, further comprising:

a blower in fluid communication with the gas inlet for delivering a drying medium gas to the gas inlet; and

and the induced draft fan is arranged at the downstream of the discharging air outlet and is communicated with the discharging air outlet in a fluid manner.

16. The vertical sludge drying machine as claimed in claim 11 or 14, wherein the inner surface of the barrel is provided with an air flow guide arranged along a spiral line for guiding the drying medium gas to flow along the path of the spiral line in the barrel.

17. The vertical sludge drying machine according to claim 1, wherein the barrel comprises a first part and a second part from top to bottom, wherein the volume of the second part is larger than that of the first part.

18. The vertical sludge drying machine according to claim 1, wherein the shaft has a frustoconical shape such that a cross-sectional area of the shaft perpendicular to the longitudinal central axis thereof gradually increases from top to bottom along the longitudinal central axis thereof.

19. The vertical sludge drying machine according to claim 1, wherein the power transmission device is a gear, a sprocket or a pulley, which is mounted on the shaft in a keyed or splined manner for transmitting power to the shaft.

20. A method of drying sludge using the vertical sludge drying machine of any one of claims 1 to 19, comprising:

introducing the sludge mass into the shell via the feed inlet;

introducing the drying medium gas into the housing via the gas inlet to dry the sludge mass in the housing;

delivering power to the shaft via a power transmission device to rotate the shaft so as to dry the sludge block and simultaneously cut the sludge block by the cutting assembly; and

and discharging the dried sludge block and the dried tail gas from the shell together through the discharge air outlet.