CN112479547A

CN112479547A - Sludge drying device and operation method

Info

Publication number: CN112479547A
Application number: CN201910865581.8A
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 relates to a sludge drying device, which comprises: a housing; the first drying chamber is limited in the shell and is provided with at least one feeding hole 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 the drying gas medium and part of the drying sludge; a first drying assembly disposed in the first drying chamber; a second drying chamber defined within the housing, the second drying chamber defining a second longitudinal axis, the second drying chamber being provided with at least one inlet for receiving a dry gaseous medium and a portion of the dried sludge from the first drying chamber, and at least one outlet for discharging tail gas and dried sludge; a second drying assembly disposed in the second drying chamber; and the transmission device is arranged between the first drying assembly and the second drying assembly and used for conveying the sludge treated by the first drying assembly to the second drying assembly, and the outlet of the first drying chamber is communicated with the inlet of the second drying chamber through the transmission device.

Description

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 needing 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 existing sludge drying equipment has some defects. At present, most of common sludge drying equipment adopts a horizontal arrangement mode, namely, a shaft of the sludge drying equipment is arranged along the horizontal direction, so that the occupied area of the sludge drying equipment 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 horizontally arranged sludge drying equipment is not provided with a cutting device for crushing 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 high water content sludge cannot be directly subjected to the end treatment, which further leads to 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, leads to the moisture content scheduling problem not up to standard.

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 the multi-stage sludge drying device, so that the difficult problems that batch production and application are difficult to realize due to low drying efficiency and high energy consumption are solved. By the treatment method of the technical scheme, secondary pollution caused by fermentation of the sludge can be avoided, and terminal 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: a housing; the first drying chamber is limited in the shell and is provided with at least one feeding hole 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 the drying gas medium and part of the drying sludge; a first drying assembly disposed in the first drying chamber; a second drying chamber defined within the housing, the second drying chamber defining a second longitudinal axis, the second drying chamber being provided with at least one inlet for receiving a dry gaseous medium and a portion of the dried sludge from the first drying chamber, and at least one outlet for discharging tail gas and dried sludge; a second drying assembly disposed in the second drying chamber; and the transmission device is arranged between the first drying assembly and the second drying assembly and used for conveying the sludge treated by the first drying assembly to the second drying assembly, and the outlet of the first drying chamber is communicated with the inlet of the second drying chamber through the transmission device.

Preferably, the housing comprises an upper cover, a bottom plate, a first inner wall, a second inner wall and an outer wall, wherein the first inner wall and the outer wall define a first drying chamber and the second inner wall and the outer wall define a second drying chamber.

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

Preferably, the first drying assembly comprises: the sludge cutting assembly is configured to cut the sludge falling on the sludge cutting assembly through relative rotation, so that drying is facilitated; and a first rotating shaft arranged in the first drying chamber along the first longitudinal axis and rotationally driven by means of a first power input.

Preferably, the second drying assembly comprises: the sludge cutting assembly is configured to cut the sludge falling on the sludge cutting assembly through relative rotation, so that drying is facilitated; and a second rotating shaft disposed in the second drying chamber along the second longitudinal axis and rotationally driven by means of a second power input.

Preferably, each sludge cutting assembly includes a rotation sub-assembly including at least one arm connected to a side wall of a corresponding one of the first and second rotation shafts so as to rotate together with the corresponding one of the first and second rotation shafts and at least one first boss provided on each arm, and a fixing sub-assembly including a plurality of fixing rods fixed at first ends to the outer wall or the corresponding one of the first and second inner walls and at second ends to a central ring provided around the corresponding one of the first and second rotation shafts and at least one second boss provided on the ring, and at least one ring supported by the plurality of fixing rods.

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 first drying assembly comprises a first sludge cutting assembly and a second sludge cutting assembly, the first sludge cutting assembly being arranged upstream of the second sludge cutting assembly with respect to the sludge flow direction.

Preferably, the first drying assembly further comprises a third sludge cutting assembly disposed downstream of the second sludge cutting assembly with respect to the sludge flow direction.

Preferably, the second drying assembly comprises a fourth sludge cutting assembly 3D, a fifth sludge cutting assembly 3E and a sixth sludge cutting assembly 3F, and the fourth sludge cutting assembly, the fifth sludge cutting assembly and the sixth sludge cutting assembly are sequentially arranged inside the second drying assembly from top to bottom.

Preferably, the gap between the adjacent ring parts of the first sludge cutting assembly is a, the gap between the adjacent ring parts of the second sludge cutting assembly is b, the gap between the adjacent ring parts of the third sludge cutting assembly is c, the gap between two adjacent ring parts of the fourth sludge cutting assembly is d, the gap between two adjacent ring parts of the fifth sludge cutting assembly is e, the gap between two adjacent ring parts of the sixth sludge cutting assembly is f, and a is more than or equal to b, more than or equal to d, more than or equal to e, and more than or equal to f.

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 or different from the number of second projections on each ring.

Preferably, the thickness of at least one arm varies from one end to the other, so as to influence the uniformity of the sludge displacement during 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.

Preferably, the sludge drying device further comprises: an air supply device that delivers a dry gas medium to at least one air inlet; and the air draft device is arranged at the downstream of the outlet of at least one of the first drying chamber and the second drying chamber.

Preferably, at least one of the first drying assembly and the second drying assembly further comprises a scraper for scraping the bottom dried sludge to the outlet.

Preferably, the scraper is located below the housing and fixedly connected to a corresponding one of the first rotating shaft and the second rotating shaft, and the scraper has at least one scraper plate extending outward from the corresponding one of the first rotating shaft and the second rotating shaft to a vicinity of the outer wall in a radial direction so as to scrape the dried sludge by the at least one scraper plate and discharge the dried sludge from the outlet.

Preferably, the sludge drying device further comprises a dust removal device, which is used for purifying tail gas and dust in the sludge drying device and the recovery bin, and introducing the purified gas into the air supply device for recycling.

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;

starting a first drying assembly and an air supply device; and

and starting the second drying component and the air draft device.

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 shell wall, the dried sludge and the tail gas do not need to be separated, and the exhaust device directly drives the dried sludge to be conveyed to a subsequent drying device or a subsequent storage device through the tail gas, 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. In addition, tail gas and dust are purified through the dust removal device, and the purified gas is directly recycled and applied through the air supply device, so that energy consumption is effectively saved, the conveying efficiency of the dried sludge is improved, and the dried sludge can be further dried by utilizing the tail gas in the conveying process.

In addition, through air supply arrangement and updraft ventilator, increase the amount of wind that the dry gas medium lets in the sludge drying device to improve sludge drying efficiency, also make mummified mud and tail gas discharge fast, guarantee the sludge treatment productivity.

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 schematic view of another exemplary sludge drying apparatus according to the present invention.

FIG. 3 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. 4 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. 5 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. 6 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. 7 is an exploded view of a portion of an exemplary sludge drying apparatus according to the present invention, showing the retaining rods and the central ring in greater detail.

Fig. 8 is a perspective view of an exemplary scraper according to the present invention.

List of reference numerals:

a: an air supply device;

b: a multi-stage drying assembly;

c: a recovery bin;

d1, D2: an air draft device;

e: a dust removal device;

201: an upper cover;

202: an outer wall;

203: a feed inlet;

204: an air inlet;

205a, 205 b: an outlet;

206: a base plate;

207, 208: an inner wall;

209: a transmission device;

210: an inlet

211: an outlet;

301a, 301 b: a rotating shaft;

302a, 302 b: a power input;

3A, 3B, 3C, 3D, 3E, 3F: a sludge cutting assembly;

31, 33, 35, 37, 39, 311: a rotation subassembly;

32, 34, 36, 38, 310, 312: 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: scraping the material device;

401: 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 device comprises an air supply device a, a multi-stage drying assembly B, a recovery bin C, air draft devices D1, D2 and a dust removal device E. The air supply device A sends a dry gas medium into the multi-drying component B through an air pipe; the multistage drying assembly B is used for introducing the sludge to be treated and a drying gas medium into the multistage drying assembly B and drying the sludge; the recovery bin C is used for uniformly collecting the sludge dried by the dry gas medium in the sludge drying device into the recovery bin; the air draft devices D1 and D2 are used for discharging tail gas and dried sludge into the multi-stage drying assembly, the discharged sludge is collected and stored by the recovery bin, and the tail gas and dust are directly discharged; and the dust removal device E is used for purifying tail gas and dust in the multi-drying component and the recovery bin and introducing the purified gas into the air supply device for recycling.

As shown in fig. 1, the sludge drying apparatus includes: a housing; a first drying chamber defined in the housing, the first drying chamber defining a first longitudinal axis, the first drying chamber being provided with at least one feed inlet 203 for feeding sludge to be dried into the sludge drying apparatus, at least one inlet 204 for feeding a drying gaseous medium into the sludge drying apparatus and at least one outlet 205a for discharging the drying gaseous medium and a portion of the dried sludge; a first drying assembly is arranged in the first drying chamber; a second drying chamber defined within said housing, the second drying chamber defining a second longitudinal axis, the second drying chamber being provided with at least one inlet 210 for receiving a drying gaseous medium and a portion of dried sludge from the first drying chamber, and at least one outlet 205b for discharging tail gas and dried sludge; and a second drying component is arranged in the second drying chamber.

While the present invention employs two desiccating assemblies, it should be understood that more than two desiccating assemblies may be employed without departing from the scope of the present invention.

Be equipped with between first mummification subassembly and the second mummification subassembly and be used for carrying the mud after first mummification subassembly is handled to the transmission device 209 of second mummification subassembly, the export 205a of first mummification cavity passes through with the import 210 of second mummification cavity transmission device 209 communicates each other, so can with mud after first mummification subassembly is handled enters into the second mummification subassembly through transmission device and carries out the redrying again, until will sludge drying to certain moisture content (mud moisture content can change as required). The transfer device of the present invention may be a mechanical transfer device such as, but not limited to, a transfer air duct, a track conveyor, a screw conveyor, and the like. Although the present invention shows a two-stage drying assembly, it is contemplated by those skilled in the art to form a multi-stage sludge drying apparatus by using multiple stages in series or parallel without departing from the scope of the present invention.

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 includes an upper cover 201, a bottom plate 206, a first inner wall 207, a second inner wall 208, and an outer wall 202. The first inner wall and the outer wall define a first drying chamber, and the second inner wall and the outer wall define a second drying chamber. Wherein the at least one inlet opening 203 is disposed in the upper cover 201, the at least one inlet opening 204 is disposed at an upper portion of the outer wall 202, and the at least one outlet opening 205b is disposed at a lower portion of the outer wall 202. It is understood that the at least one feed opening 203 may also be provided in an upper portion of the outer wall 202 without departing from the scope of the present 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 205b may also be provided in the bottom plate 206 without departing from the scope of the present invention.

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

To improve the efficiency of sludge drying, an air supply device A is arranged at the at least one air inlet 204, and air suction devices D1 and D2 are arranged at the downstream of the at least one outlet 205a and 205 b. According to an example of the present invention, the air blowing device may include, but is not limited to, a blower, a fan, and the like. According to one example of the present invention, the air extraction device may include, but is not limited to, an induced draft fan, a suction device, and the like. After the sludge to be dried enters the sludge drying device from the feeding hole, the air supply device and the air exhaust device can be started, and the air quantity of the 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.

As shown in fig. 1, the sludge drying apparatus includes two air extractors D1, D2, D2 being disposed downstream of the at least one outlet 205a, and D1 being disposed downstream of the at least one outlet 205 b.

The second mummification subassembly is equipped with exhaust device D2 that is arranged in extracting first mummification subassembly interior exhaust mud and tail gas and enters into it on upper cover upper portion, makes the mud after first mummification subassembly is handled continue the mummification in getting into the second mummification subassembly, and tail gas then passes through the export 211 that sets up on the upper cover to discharge in getting into dust collector through exhaust device D2. In another embodiment, can set up the pipeline at updraft ventilator D2 and communicate each other with the second mummification subassembly for directly enter into the second mummification subassembly after exhausting tail gas from updraft ventilator D2, in order further to carry out the drying to the second mummification subassembly, thereby can effective energy saving, can effectively utilize original tail gas waste heat to carry out the redrying to mud. In another embodiment, after the drying gas medium is directly contacted with the sludge in the first drying assembly, the water content is higher, the moisture of the drying gas medium is heavier, the drying gas medium becomes more saturated moisture-containing tail gas after entering the second drying assembly, and the capability of continuously drying the sludge in the second drying assembly is lower, so that an air supply device can be arranged on the top or the upper cover of the second-stage drying device, the drying gas medium is sent into the second-stage drying device, the sludge is directly contacted, the secondary drying effect is achieved, and the sludge is treated to a certain water content (the water content of the sludge can be changed as required). The air draft device D2 is mainly designed for the specific formation that the sludge coming out of the first drying component is insufficient in power and cannot enter the second drying component, and if the conveying device is a conveying and blowing pipe structure, an air draft device needs to be additionally arranged.

An outlet for discharging dried sludge and tail gas at the lower part of the shell wall is connected with the recovery bin C, 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 by a dust removal device B.

According to one example of the present disclosure, a first drying assembly comprises: the sludge cutting assembly is configured to cut the sludge falling on the sludge cutting assembly through relative rotation, so that drying is facilitated; and a first rotation shaft 301a, which is arranged in the first drying chamber along the first longitudinal axis and is rotationally driven by means of a first power input 302 a.

According to one example of the present disclosure, a second drying assembly comprises: the sludge cutting assembly is configured to cut the sludge falling on the sludge cutting assembly through relative rotation, so that drying is facilitated; and a second rotary shaft 301b, which is arranged in the second drying chamber along the second longitudinal axis and is rotationally driven by means of a second power input 302 b.

As shown in fig. 1, the first drying assembly 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. The second drying assembly comprises at least one sludge cutting assembly, each sludge cutting assembly comprising a rotating

subassembly

37, 39, 311 and a

stationary subassembly

38, 310, 312.

According to an example of the present invention, as shown in fig. 3, the rotation sub-assembly 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 first rotation shaft 301a so as to rotate together with the first rotation shaft 301 a. The fixing sub-assembly 32 includes a plurality of fixing rods 363 and at least one ring 361 supported by the plurality of fixing rods 363, the fixing rods 363 being fixed at a first end to the outer wall 202 and at a second end to a central ring 364 disposed around the first rotation axis 301a, the ring 361 being provided with at least one second projection 362.

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 an example of the invention, a first sludge cutting assembly 3A, a second sludge cutting assembly 3B and a third sludge cutting assembly 3C in a first drying assembly are sequentially arranged inside the first drying assembly from top to bottom; and a fourth sludge cutting component 3D, a fifth sludge cutting component 3E and a sixth sludge cutting component 3F in the second drying component are sequentially arranged inside the second drying component from top to bottom. Preferably, the stator sub-assembly 32 of the first sludge cutting assembly has two ring-shaped members and a gap between adjacent two ring-shaped members is a, the stator sub-assembly 34 of the second sludge cutting assembly has three ring-shaped members and a gap between adjacent two ring-shaped members is b, the stator sub-assembly 36 of the third sludge cutting assembly has four ring-shaped members and a gap between adjacent two ring-shaped members is c, the stator sub-assembly 38 of the fourth sludge cutting assembly has five ring-shaped members and a gap between adjacent two ring-shaped members is d, the stator sub-assembly 310 of the fifth sludge cutting assembly has six ring-shaped members and a gap between adjacent two ring-shaped members is e, the stator sub-assembly 312 of the sixth sludge cutting assembly has seven ring-shaped members and a gap between adjacent two ring-shaped members is f, a ≧ b ≧ c ≧ d ≧ e ≧ f, thereby achieving sludge from lump to granule or, and the requirements of the granularity and the water content of the sludge are met under the cooperation of drying.

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, and that the first nubs 352 on each arm 351 are 1 more or 1 less than the rings 361 to ensure that the rings 361 and the first nubs 352 alternate to effectively cut sludge.

The sludge cutting assemblies of the present invention have the same configuration, the only difference being the number of rings and the number of shearing elements on the arms, and therefore the present invention is described only with respect to the third sludge cutting assembly 3C. As shown in fig. 3-4, 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. 3, 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 outer wall 202, the other end 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 have 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 greater than or equal to the number of second tabs 362 on a ring 361 further from the longitudinal axis. Furthermore, the width of the second tab 362 on the ring 361 closer to the longitudinal axis may be less than, greater than, or equal to the width of the second tab 362 on the ring 361 further from the longitudinal axis.

In addition, as shown in fig. 3 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 along the circumferential direction, which helps to enhance the cutting effect on the sludge block. The second tabs 362 on each ring 361 are offset or shifted from each other in the circumferential direction to more evenly cut the sludge. 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 fixation rod 363 and all rings in each fixation subassembly are arranged concentric with central ring 364. In each stator subassembly, the distance between adjacent annular members 361 is equal in the radial direction. It will be appreciated that the spacing between adjacent annuli 361 may not be equal. In this way, these annular members 361 form a grid below the rotating sub-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 8, the distance between each ring 361 on each cutting assembly can be the same or different from top to bottom along the vertical direction, and can be adjusted accordingly according to actual needs, sludge properties, and the like, so as to meet the needs of different water content or granularity. Adjacent rings in the upper stator subassembly are spaced a greater distance apart, and adjacent rings in the lower stator subassembly are spaced a lesser distance apart. As shown, a first sludge cutting assembly is disposed at an upper portion of the second sludge cutting assembly with respect to a sludge flow direction, and a third sludge cutting assembly is disposed at a lower portion of the second sludge cutting assembly with respect to the sludge flow direction. The clearance between the adjacent ring-shaped parts of the first sludge cutting assembly is a, the clearance between the adjacent ring-shaped parts of the second sludge cutting assembly is b, the clearance between the adjacent ring-shaped parts of the third sludge cutting assembly is c, and a is more than or equal to b and more than or equal to 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 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 second protrusions on the adjacent ring members may be different according to actual needs, and the size of the first protrusion 352 provided on the rotating sub-assembly may be adjusted according to the size of the gap between the second protrusions 362 on the adjacent ring members. In another embodiment, the second protrusions 362 of adjacent annular members are offset or shifted from each other by a certain distance on the same horizontal plane or in the circumferential direction, however, the second protrusions of adjacent annular members may be offset by a certain angle or disposed on the same horizontal plane according to the sludge property, water content, etc.

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 is 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 projections 351 and the second projections 362 are staggered face-to-face without departing from the scope of this invention.

According to an example of the present invention, the sludge drying apparatus further comprises scrapers 4a, 4b for scraping bottom dried sludge to the outlet. The scrapers 4a, 4b are located below the housing and are fixedly connected to the

rotary shafts

301a, 301 b. According to an example of the present invention, the scraper 4a is located below the at least one sludge cutting assembly 3A, 3B, 3C and is fixedly connected to the rotating shaft 301a, and the scraper 4a has at least one scraper plate 401 extending outward from the rotating shaft to the vicinity of the outer wall in the radial direction, so as to scrape the dried sludge through the at least one scraper plate 401 and discharge the dried sludge from the outlet 205 a. The scraper 4b is located below the at least one sludge cutting assembly 3D, 3E, 3F and is fixedly connected to the rotating shaft 301b, and the scraper 4b has at least one scraper plate 401 extending outward from the rotating shaft in a radial direction to the vicinity of the outer wall so as to scrape the dried sludge through the at least one scraper plate 401 and discharge the dried sludge from the outlet 205 b. In the example shown in fig. 8, the at least one scraper plate 401 is arranged at an angle of less than 90 degrees with respect to the base plate 206, preferably the at least one scraper plate 401 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 401 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 401 may take the form of a blade, however, it should be understood that the at least one scraper plate 401 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.

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

First, start blower a and first updraft ventilator D1: dry gas media from the outside enters the first drying assembly from the air inlet of the first drying chamber through an air supply device; start first updraft ventilator D1, will mud after first mummification subassembly is handled is scraped mud to discharge gate department through scraping the sweeper, enters into the second mummification subassembly and continues mummification and shearing, discharges by the discharge gate department of second mummification subassembly bottom at last to in taking out the mud of discharge gate department to the recovery storehouse by updraft ventilator.

Starting a first drying assembly and a second drying assembly: the sludge to be dried enters the first drying assembly from the feed port and then firstly falls into the first cutting assembly in the first drying assembly, sludge blocks to be dried are reduced under the shearing/cutting action of the cutting assembly, and the sludge blocks smaller than the gap between two adjacent annular pieces sequentially fall into the second cutting assembly and the third cutting assembly and are scraped to the discharge port by the scraper to be discharged; the sludge discharged from the outlet of the first drying component and the tail gas are conveyed into the second drying component together through a conveying device, and the sludge and the tail gas are dried, cut and sheared by the fourth cutting component, the fifth cutting component and the sixth cutting component in the second drying component in sequence to finally form the dried sludge reaching the standard.

Starting a feeding device: and starting an external conveying device, and feeding the sludge to be dried into the first drying assembly from the feeding hole.

Starting the dust removal device: the exhaust device sends tail gas into the dust removal device, the tail gas is directly discharged after being purified by the dust removal device and can also be directly sent into the air supply device for recycling.

In another embodiment, when the kinetic energy generated by the first air draft device D1 cannot make the processed sludge at the outlet 205a in the first drying assembly enter the second drying assembly, the second air draft device D2 is activated, so that the kinetic energy is effectively increased, and the processed sludge of the first drying assembly can smoothly and completely enter the second drying assembly.

Fig. 2 shows another exemplary multistage sludge drying apparatus of the present invention, except that the second drying assembly is not provided with at least one sludge cutting assembly, but may be a drying assembly of the prior art, such as a bedroom drying machine, a vertical drying machine, a mechanical conveying device, a thin layer drying device, a drum drying device, a fluidized bed drying device, etc., which may be reasonably and scientifically arranged in the multistage sludge drying apparatus of the present invention to form an integral drying apparatus.

Although the second drying assembly is shown in fig. 2 as employing a prior art drying assembly, it should be understood that at least one sludge cutting assembly may be employed in the second drying assembly, and the first drying assembly may be a prior art drying assembly, such as a bedroom drying machine, a vertical drying machine, a mechanical conveyor, a thin layer drying device, a drum drying device, a fluidized bed drying device, etc., without departing from the scope of the present invention.

The sludge drying apparatus of the present invention will be described next with reference to fig. 2.

First, start air supply arrangement A and updraft ventilator: dry gas media from the outside enters the first drying assembly from the air inlet of the first drying chamber through an air supply device; start first updraft ventilator D1, will mud after first mummification subassembly is handled is scraped mud to discharge gate department through scraping the sweeper, enters into the second mummification subassembly and continues mummification and shearing, discharges by the discharge gate department of second mummification subassembly bottom at last to in taking out the mud of discharge gate department to the recovery storehouse by updraft ventilator.

Starting a first drying assembly and a second drying assembly: the sludge to be dried enters the first drying assembly from the feed port and then firstly falls into the first cutting assembly in the first drying assembly, sludge blocks to be dried are reduced under the shearing/cutting action of the cutting assembly, and the sludge blocks smaller than the gap between two adjacent annular pieces sequentially fall into the second cutting assembly and the third cutting assembly and are scraped to the discharge port by the scraper to be discharged; meanwhile, a flowing path of the drying gas medium sequentially passes through the first cutting assembly, the second cutting assembly and the third cutting assembly from top to bottom to be in direct contact with the sludge to be dried, so that moisture in the sludge is taken away; and conveying the sludge and tail gas into a second drying assembly through a conveying device, and drying to finally form the dried sludge reaching the standard.

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 shell wall, the dried sludge and the tail gas do not need to be separated, and the exhaust device directly drives the dried sludge to be conveyed to a subsequent drying device or a subsequent storage device through the tail gas, 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. In addition, tail gas and dust are purified through the dust removal device, and the purified gas is directly recycled and applied through the air supply device, so that energy consumption is effectively saved, and the dried sludge conveying efficiency is improved.

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 sludge drying apparatus comprising:

a housing;

the first drying chamber is limited in the shell and is provided with at least one feeding hole 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 the drying gas medium and part of the drying sludge;

a first drying assembly disposed in the first drying chamber;

a second drying chamber defined within the housing, the second drying chamber defining a second longitudinal axis, the second drying chamber being provided with at least one inlet for receiving a dry gaseous medium and a portion of the dried sludge from the first drying chamber, and at least one outlet for discharging tail gas and dried sludge;

a second drying assembly disposed in the second drying chamber; and

the conveying device is arranged between the first drying assembly and the second drying assembly and used for conveying the sludge processed by the first drying assembly to the second drying assembly, and the outlet of the first drying chamber is communicated with the inlet of the second drying chamber through the conveying device.

2. The sludge drying apparatus of claim 1, wherein the housing includes a top cover, a bottom plate, a first inner wall, a second inner wall, and an outer wall, wherein the first inner wall and the outer wall define a first drying chamber and the second inner wall and the outer wall define a second drying chamber.

3. The sludge drying device of claim 2, wherein the upper cover, the bottom plate and the outer wall are integrally formed.

4. The sludge drying apparatus of claim 2, wherein the first drying assembly comprises: the sludge cutting assembly is configured to cut the sludge falling on the sludge cutting assembly through relative rotation, so that drying is facilitated; and a first rotating shaft arranged in the first drying chamber along the first longitudinal axis and rotationally driven by means of a first power input.

5. The sludge drying apparatus of claim 4, wherein the second drying assembly comprises: the sludge cutting assembly is configured to cut the sludge falling on the sludge cutting assembly through relative rotation, so that drying is facilitated; and a second rotating shaft disposed in the second drying chamber along the second longitudinal axis and rotationally driven by means of a second power input.

6. The sludge drying apparatus of claim 5, wherein each sludge cutting assembly includes a rotating sub-assembly and a stationary sub-assembly, the rotating sub-assembly including at least one arm and at least one first tab disposed on each arm, the arm being connected to a respective one of the first and second rotating shafts so as to rotate with the respective one of the first and second rotating shafts, the stationary sub-assembly including a plurality of stationary rods and at least one ring supported by the plurality of stationary rods, the stationary rods being fixed at a first end to the outer wall or a respective one of the first and second inner walls and at a second end to a central ring disposed around the respective one of the first and second rotating shafts, the ring being provided with at least one second tab thereon.

7. The sludge drying device of claim 6, 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.

8. The sludge drying apparatus of claim 7, wherein the number of arms of each rotating sub-assembly is equal to or different from the number of second protrusions on each ring.

9. The sludge drying apparatus of claim 8, wherein the thickness of the at least one arm varies from end to affect the uniformity of sludge displacement during rotation of the rotating sub-assembly to allow uniform distribution of sludge on the annular member.

10. The sludge drying apparatus of claim 9, wherein the number of rings (361) per fixed sub-assembly is equal to the number of first lugs on each arm, or 1 more or less than the number of first lugs on each arm, such that the rings alternate with the first lugs.

11. The sludge drying device of claim 6, wherein the first drying assembly comprises a first sludge cutting assembly and a second sludge cutting assembly, and the first sludge cutting assembly is arranged on the upper portion of the second sludge cutting assembly relative to the sludge flowing direction.

12. The sludge drying apparatus of claim 11, wherein the first drying assembly further comprises a third sludge cutting assembly disposed below the second sludge cutting assembly with respect to a sludge flow direction.

13. The sludge drying device of claim 12, wherein the second drying assembly comprises a fourth sludge cutting assembly, a fifth sludge cutting assembly and a sixth sludge cutting assembly, and the fourth sludge cutting assembly, the fifth sludge cutting assembly and the sixth sludge cutting assembly are sequentially arranged inside the second drying assembly from top to bottom.

14. The sludge drying device according to claim 13, wherein the gap between the adjacent ring-shaped members of the first sludge cutting assembly is a, the gap between the adjacent ring-shaped members of the second sludge cutting assembly is b, the gap between the adjacent ring-shaped members of the third sludge cutting assembly is c, the gap between two adjacent ring-shaped members of the fourth sludge cutting assembly is d, the gap between two adjacent ring-shaped members of the fifth sludge cutting assembly is e, and the gap between two adjacent ring-shaped members of the sixth sludge cutting assembly is f, a > b > c > d > e > f.

15. The sludge drying apparatus of any one of claims 1-14, wherein the sludge drying apparatus further comprises: an air supply device that delivers a dry gas medium to at least one air inlet; and the air draft device is arranged at the downstream of the outlet of at least one of the first drying chamber and the second drying chamber.

16. The sludge drying device of claim 15, wherein the sludge drying device further comprises a dust removing device for purifying tail gas and dust in the sludge drying device and the recycling bin and introducing the purified gas into the air supply device for recycling.

17. The sludge drying apparatus of any one of claims 1-14, wherein at least one of the first drying assembly and the second drying assembly further comprises a scraper for scraping the bottom dried sludge to the outlet.

18. The sludge drying apparatus of claim 17, wherein the scraper is located below the housing and fixedly connected to a corresponding one of the first rotating shaft and the second rotating shaft, the scraper having at least one scraper plate extending outward from the corresponding one of the first rotating shaft and the second rotating shaft to a vicinity of the outer wall in a radial direction so as to scrape the dried sludge by the at least one scraper plate and discharge the dried sludge from the outlet.

19. A method of operating a sludge drying apparatus as claimed in any one of claims 1 to 18, comprising:

starting the air supply device and the air exhaust device: introducing a dry gaseous medium from the outside from at least one gas inlet of the first drying chamber; starting an air draft device, scraping and sweeping the sludge treated by the first drying component to a discharge port through a scraper, entering a second drying component for continuous drying and shearing, finally discharging the sludge from the discharge port at the bottom of the second drying component, and pumping the sludge at the discharge port into a recovery bin through the air draft device;

starting a first drying assembly and a second drying assembly: the sludge to be dried is reduced under the shearing/cutting action of the cutting assembly, and the dried sludge is swept to a discharge port by the sweep device and is discharged; meanwhile, the dried gas medium directly contacts with the sludge to be dried from the top to the bottom through a flow path, so that the moisture in the sludge is taken away, the finally dried tail gas and the treated sludge are discharged together along with an outlet in the first drying assembly and enter the second drying assembly, and the dried tail gas and the treated sludge are dried by the first drying assembly and the second drying assembly to finally form the dried sludge reaching the standard;

starting a feeding device: and starting the feeding device, and feeding the sludge to be dried into the first drying chamber through the at least one feeding hole.

20. The method of sludge drying apparatus of claim 19 further comprising

21. The method of claim 19, further comprising starting the second air draft device when kinetic energy generated by the first air draft device cannot enable the processed sludge at the outlet of the first drying assembly to enter the second drying assembly, so as to effectively increase kinetic energy, and enable the processed sludge of the first drying assembly to smoothly enter the second drying assembly.