TW201641444A - Sludge drying system and method - Google Patents

Abstract

A sludge drying system, comprising a conveying device, a conditioning device, a dehydration device and a drying device; the drying device comprises a casing; the casing has a partition wall to divide the casing into a first drying chamber and a second drying chamber; a communication opening communicating the first drying chamber and the second drying chamber is formed on the partition wall; a feeding port and an air outlet are provided at an upper portion of the first drying chamber; a discharging port is provided on a circumferential wall of the first drying chamber; an air inlet is provided on a side wall of the second drying chamber; a stirring device is provided in the first drying chamber, and comprises a rotating shaft and a stirring assembly provided on the rotating shaft and capable of scraping sludge around the communication opening; and a blowing device is in communication with the second drying chamber via the air inlet. Also provided is a method for drying the sludge by using the sludge drying system.

Description

Sludge drying system and method

The present invention relates to the field of sludge drying, and more particularly to a sludge drying system for drying sludge having a moisture content of about 90% or more, thereby obtaining sludge having a moisture content of about 40% or less, and A method for sludge drying using the sludge drying system.

The treatment of sewage in modern cities is indispensable, and a large amount of sludge is produced as the sewage is treated. At present, the sewage treatment plant generally adopts the method of concentration or dehydration to pre-treatment the sludge to reduce the water content of the sludge from above 90% to 60-80%, and then the landfill and solidification of the treated sludge. Or dry processing. Landfilling is easy to ferment sludge and cause secondary pollution. However, existing curing or drying equipment usually has low drying efficiency and high energy consumption, and it is difficult to achieve a large amount of pollution while reducing sludge moisture content. mud. It is usually necessary to go through multiple sludge treatment processes to reduce the moisture content of the sludge from above 90% to 40-60%, and these sludge treatment processes are performed separately in each equipment. These sludge treatment equipment have the defects of large volume, scattered arrangement, single function and high energy consumption.

Chinese invention patent application CN101186422A proposes a closed multi-chamber fluidized bed sludge drying method. The fluidized bed used in this method not only consumes energy but is also inefficient, making it difficult to achieve continuous and large-scale sludge drying.

The Chinese utility model patent CN203319838U proposes a sludge solidification treatment mixer. Such a mixer reduces the moisture content of the sludge by blending the additive into the sludge, thereby not only increasing the amount of sludge but also preventing the secondary pollution of the sludge after the landfill.

Due to the strong viscosity, easy agglomeration and difficult to break the sludge, the existing sludge drying equipment is difficult to achieve large-scale drying of such sludge to reduce the moisture content of the sludge, and there is no equipment. Or the system can directly convert sludge from the sewage treatment plant with a water content of more than 90% into sludge with a moisture content of less than 40%. Therefore, there is a need to provide such a sludge drying system and method to achieve the above objectives.

In view of the deficiencies in the prior art, the present invention proposes a sludge drying system in which various sludge treatment apparatuses are integrated, and a method of sludge drying using the system. The sludge drying system can directly reduce the moisture content of the sludge from the sewage treatment plant from above 90% to below 40%, so as to realize the transformation of the sludge from liquid, block, fragments, particles to particles. In turn, the drying efficiency of the sludge is improved.

Using the conveying device, the tempering device, the dehydrating device, the drying device and the air blowing device in the sludge drying system, the water content can be 90% The liquid sludge is dried to reduce the water content of the sludge to about 40% or less, so that sludge of a granular form which does not cause secondary sludge due to water immersion after landfill can be obtained. In addition, the pre-conditioning apparatus and the concentrating apparatus can be combined with the pre-conditioning apparatus and the concentrating apparatus in the sludge drying system of the present invention to perform pre-conditioning treatment and concentration treatment on the liquid sludge, so that more moisture can be separated from the sludge. The concentrated liquid sludge is further subjected to a drying treatment by the above respective devices in the sludge drying system, whereby powdery granular sludge can be obtained.

The sludge block with different sizes after dewatering can be crushed into sludge pieces of uniform size by using the crushing device incorporated in the sludge drying system of the present invention, so that the sludge can be evenly dried during the drying process. effect.

With the air introducing device, the heating device, and the heat exchange device incorporated in the sludge drying system of the present invention, the drying efficiency can be improved and energy can be saved.

The sludge is sufficiently contacted with the dry gas by the flipping of the flipping assembly of the flipping device provided in the first drying chamber of the drying device and the shearing and breaking of the sludge by the blades or ratchets on the flipping assembly, thereby solving the problem The problem of uneven internal and external drying of the sludge during the drying process, wherein the drying gas is formed by a communication port or a communication port formed on the partition wall for separating the first drying chamber and the second drying chamber The side opening formed by the upper bridge and the partition wall enters the first drying chamber from the second drying chamber, and the blade of the flipping assembly or the front end of the ratchet not only improves the scraping of the sludge near the communication port or the side opening The frequency of contact between the drying gas and the sludge also promotes the transformation of the sludge from the fragments to the granular and granular particles, which accelerates Drying of the sludge.

The sludge drying system of the invention has the characteristics of high drying efficiency, low energy consumption, small floor space and strong adaptability, and the user can use the sludge treatment device in the sludge drying system of the invention as needed. The existing sludge treatment plants in the wastewater treatment plant are combined to reduce costs.

The method for sludge drying using the sludge drying system of the present invention can significantly reduce the moisture content of the sludge by quenching, dehydrating and drying processes. Drying gas is continuously scraped, crushed and turned over by the flipping assembly of the flipping device provided in the first drying chamber of the drying device, and the front end of the blade or the ratchet scrapes off the sludge near the communication port or the side opening It can smoothly enter the first drying chamber, thereby improving the drying efficiency of the sludge and reducing the energy consumption.

The present invention provides a sludge drying system comprising a conveying device for receiving and conveying sludge, a tempering device, the tempering device being located downstream of the conveying device, and The sludge from the conveying device is mixed with a tempering agent to improve the dehydration of the sludge; and a dewatering device that dehydrates the sludge from the upstream to reduce the water content of the sludge a drying device comprising a casing, wherein the casing has a partition wall to divide a space within the casing into a first drying chamber and a second drying chamber, and in the At least one communication port for communicating the first drying chamber and the second drying chamber is formed on the partition wall; a feed port for the sludge to be dried and disposed at an upper portion of the first drying chamber An exhaust port of the drying gas after drying the sludge, and a drying chamber disposed on the circumferential wall of the first drying chamber for drying a discharge port of the sludge; at least one inlet port for drying gas to be dried sludge disposed on a side wall of the second drying chamber; and a tumbling sludge for setting the first drying chamber a flipping device comprising a rotating shaft and at least one flipping assembly disposed on the rotating shaft, wherein the at least one flipping assembly scrapes sludge adjacent to the at least one communication port; and the air blowing device Wherein the air blowing device is in communication with the second drying chamber through the at least one air inlet.

According to the above aspect, further comprising a crushing device located downstream of the dewatering device and upstream of the drying device, wherein the crushing device crushes the dewatered sludge from the upstream to Conducive to the drying treatment of the sludge.

According to various aspects described above, it further includes providing at least one cleaning opening on an end wall of the second drying chamber.

According to each of the above aspects, it further includes a discharge device disposed in the second drying chamber for discharging sludge leaking from the first drying chamber into the second drying chamber to the cleaning port.

According to each of the above aspects, the tempering apparatus includes a mixer in which a tempering agent is mixed with sludge to improve dewatering of the sludge.

According to each of the above aspects, the method further includes a pre-conditioning apparatus, the pre-conditioning apparatus is located downstream of the conveying apparatus, and mixes the sludge with the tempering agent to promote sedimentation of the sludge; The device is located upstream of the tempering device for separating the pre- conditioned sludge from water to reduce the moisture content of the sludge.

According to each of the above aspects, the dewatering apparatus includes a plate and frame filter press, and the tempered sludge is pressure-filtered in the plate and frame filter press to obtain a solid sludge having a low water content.

According to each of the above aspects, it further includes a heating device for heating the drying gas, wherein the heating device is located upstream or downstream of the air blowing device.

According to the above various aspects, it further includes an air guiding device, wherein the air guiding device communicates with the first drying chamber through the exhaust port.

According to the above various aspects, the drying device is provided with a heat exchange device, the cold end of the heat exchange device is in communication with the air guiding device, and the hot end thereof is in communication with the air blowing device for exchanging from the row The heat in the exhaust from the gas outlet.

According to the above various aspects, the at least one flipping assembly of the at least one sludge turning device has at least one blade or ratchet extending radially outward from the rotating shaft, wherein the rotating shaft rotates when the rotating shaft rotates A front end of the at least one blade or ratchet of the at least one flip assembly or a scraping member mounted at a front end of the blade or ratchet may scrape or partially scrape the sludge in or near the at least one communication port.

According to the above various aspects, further comprising a bridge disposed above the at least one communication port, wherein a side opening is formed between the bridge and the partition wall to form from the at least one communication port The curved path of the side opening.

According to each of the above aspects, the at least one flipping component Corresponding to the bridge member, such that the front end of the at least one blade or ratchet of the at least one flipping assembly or the side edge of the front end of the scraping member mounted on the blade or ratchet may be scraped or partially scraped In addition to the sludge near the side opening.

According to each of the above aspects, the partition wall has a concave upper surface.

According to each of the above aspects, the at least one includes at least two sludge turning devices, wherein each of the sludge turning devices includes a plurality of flipping assemblies, and the at least one blade or spine of each of the plurality of flipping assemblies A front end of the tooth or a scraping member mounted at a front end of the at least one blade or ratchet may scrape sludge in or near the at least one communication port, wherein the at least two of the sludge turning devices The plurality of flipping assemblies of one sludge turning device and the plurality of flipping assemblies of the other are staggered with each other.

The present invention also provides a method for sludge drying by using the sludge drying system according to any one of the above aspects, the method comprising the steps of: conveying the liquid sludge to the tempering device by the conveying device, In the quenching and tempering device, the sludge is mixed with a tempering agent to improve the dehydration property of the sludge; the tempered sludge is sent to a dehydration device for dehydration to obtain solid sludge; Feeding the solid sludge block into a first drying chamber of the drying device; operating at least one sludge turning device disposed in the first drying chamber, wherein the at least one sludge turning device Rotating the shaft to rotate the at least one flipping assembly such that the front end of the at least one vane or ratchet on the at least one flipping assembly is scrapable Sludge near at least one communication port formed on the partition wall between the first drying chamber and the second drying chamber; and introducing a drying gas into the second drying chamber by the air blowing device and communicating by the at least one The mouth enters the second drying chamber.

According to the above aspect, it further comprises a crushing step of feeding the dehydrated solid sludge into a crushing device, and crushing the block of the sludge into pieces in the crushing device.

According to each of the above aspects, the method further includes feeding the liquid sludge into a pre-conditioning apparatus, and mixing the sludge with a tempering agent in the pre-conditioning apparatus to promote the liquid sludge. Precipitating; and pre-treating the sludge into a concentrating device, wherein the pre- conditioned sludge is separated from water to obtain a sludge having a low water content.

According to each of the above aspects, it further includes a heating step of heating the drying gas exiting or entering the air blowing device with the heating device.

According to the above various aspects, it further includes an air guiding device, wherein the air guiding device communicates with the first drying chamber through the exhaust port.

According to the above various aspects, the method further includes a heat exchange step of passing the exhaust gas leaving the air introducing means through the cold end of the heat exchange means and passing the drying gas entering the air blowing means through the hot end of the heat exchange means To reuse heat from the exhaust gas from the exhaust port.

According to the above various aspects, the method further includes rotating the at least one of the at least one sludge turning device when the rotating shaft rotates a front end of at least one blade or ratchet on the assembly or a side edge of a front end of the scraping member on which the at least one blade or ratchet is mounted may scrape at least one bridge disposed above the at least one communication port and the Sludge near the side opening formed between the partition walls.

According to each of the above aspects, the method further includes removing sludge leaking from the first drying chamber into the second drying chamber from the cleaning port by a discharge device disposed in the second drying chamber.

1‧‧‧Sludge drying system

2‧‧‧Upper casing

3‧‧‧Upper cover (or cover)

4‧‧‧ partition wall

4a‧‧‧ Lower case

5‧‧‧Connected

6a‧‧‧First drying room

6b‧‧‧Second drying room

7, 7a, 7b‧‧‧ flipping device

8‧‧‧ Feed inlet

8a‧‧‧feeding steps

9‧‧‧Outlet

9a‧‧‧Drawing steps

10‧‧‧Exhaust port

12‧‧‧Blowing device

12b‧‧‧Blasting steps

13‧‧‧Air intake

13b‧‧‧Winding steps

15‧‧‧air inlet

15a‧‧‧Clean up

18‧‧‧ Gears or pulleys

18b‧‧‧Power input parts

101‧‧‧Conveyor

101a‧‧‧Transportation steps

102‧‧‧Pre-conditioning equipment

102a‧‧‧Pre-conditioning steps

103‧‧‧concentrator

103a‧‧‧ Concentration step

104‧‧‧Qualification device

104a‧‧‧Qualification steps

105‧‧‧Dehydration device

105a‧‧‧ Dehydration step

106‧‧‧Crushing device

106a‧‧‧Fracture steps

107‧‧‧Drying device

107a‧‧‧Drying steps

107a1‧‧‧Flip and scrape steps

107a2‧‧‧Second drying or re-drying steps

108‧‧‧ heating device

109‧‧‧Heat exchange unit

109a‧‧‧heat recovery steps

401‧‧‧ Bridge

402‧‧‧Side opening

701a, 701b‧‧‧ rotating shaft

702, 702a, 702b‧‧‧ flip components

703a, 703b‧‧‧ blades or ratchets

X‧‧‧ Length direction of the communication port 5

G‧‧‧ longitudinal direction of the casing

The structure, advantages and technical effects of the preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments in which: FIG. 1 is a schematic view of the sludge drying system of the present invention; 3 is a longitudinal cross-sectional view of the drying device in the sludge drying system; FIG. 3 is a transverse cross-sectional view of the sludge drying device of FIG. 2; FIG. 4 is a perspective view showing the internal structure of the drying device of FIG. 2; 1 is an enlarged perspective view of the bridge member on a part of the partition wall of the curved portion A of FIG. 1; FIG. 6 is an enlarged view of a portion A circled in FIG. 1; FIG. 7 is a longitudinal direction transverse to the housing 6 is a left side cross-sectional view of the partition wall; FIG. 8 is a flow chart of the sludge drying process of the present invention; and FIG. 9 is a drying step of the sludge drying process of FIG. schematic diagram.

1 shows a preferred embodiment of the sludge drying system of the present invention, wherein the sludge drying system 1 can reduce the moisture content of the sludge from about 90% or more to less than about 40%, thereby obtaining the powder. Sludge.

The sludge drying system 1 integrally includes a conveying device, a tempering device (or a secondary tempering device), a dehydrating device, a drying device, and a blast device, and further includes a front tempering (or primary tempering) device and Concentration device, crushing device, etc. The sludge drying system 1 of the present invention may further include a drafting device, a heating device, and a heat exchange device.

The liquid sludge usually from sewage treatment equipment has a water content of 90% or more. After receiving the liquid sludge, the conveying device 101 can convey the liquid sludge to the tempering device or the secondary tempering device 104 by means of a pipe indicated by a double line in the direction indicated by the arrow. The tempering agent is mixed with the sludge in the tempering device 104 to improve the dewatering property of the sludge. The tempering agent may be placed in the tempering device 104 in advance, or the sludge may enter the tempering device 104 at the same time. Or later. For example, the sludge is conveyed to a mixer as a tempering device 104 and then an inorganic tempering agent is added, and this inorganic tempering agent facilitates mechanical dewatering of the sludge.

The tempered sludge is piped to a dewatering device 105 located downstream of the tempering device, and the tempered sludge is filtered in the dewatering device 105 to separate a large amount of water and form solid sludge or dehydrated sewage. mud. Preferably, in the present invention, for example, a method of pressurization and filtration will be employed. The water in the sludge is separated, and the quenched and tempered sludge is usually dehydrated by a plate and frame filter press, whereby sludge having a water content of about 40-60% can be obtained, and the obtained sludge is substantially in the form of a cake. Or a block, that is, a shaped block.

The dehydrated bulk sludge is conveyed to the downstream drying device 107 by a conveying device such as a pipe, a funnel or a conveyor belt. In the drying device 107, the bulk sludge is dried by the turning, shearing, and crushing of the turning device and sufficient contact with the dry gas, and finally becomes a granular granular sludge having a water content of 40% or less. The dried sludge is discharged through a discharge port 9 provided in the drying device. The dried sludge does not cause secondary pollution to the environment after landfilling, and can be reused if used for fattening, building materials, and the like.

In order to better exert the function of the drying device, a crushing device may be provided downstream of the dewatering device 105. The dewatered bulk sludge is conveyed by the conveying device to the crushing device 106. The crushing device 106 breaks the bulk sludge from the upstream dewatering device into small pieces or pieces to facilitate drying. Since the block size of the slug sludge after dewatering is not uniform, different sizes of slug sludge may cause different degrees of drying of the individual blocks during the drying process. Although the existing crushing device can also crush the bulk sludge, the sludge is not sufficiently dehydrated, resulting in a high moisture content of the sludge, so that the crushing device can not only obtain a small block having a substantially uniform particle size. Moreover, it is also difficult to prevent the broken small pieces or agglomerates from sticking again. The crushing device employed in the sludge drying system 1 of the present invention can effectively eliminate the above drawbacks, that is, the bulk sludge can be broken into pieces of similar size. The crushing device of the present invention comprises a control member and a crushing assembly, Adjusting and controlling the speed of the sludge entering the crushing device by the controlling member, so that the crushing assembly can crush the bulk sludge at a predetermined speed, thereby obtaining a small block of sludge of a desired uniform size or Pieces.

As shown in Fig. 1, in the sludge drying system 1, in addition to the above-described devices, a pre-conditioning device 102 and a concentration device 103 are provided. The conveying device 101 can convey the received sludge to the front tempering device (or primary tempering device) 102 on the left side of the drawing by a pipe indicated by a double line in the direction indicated by the arrow. In the pre-conditioning apparatus 102, the organic tempering agent is mixed with the liquid sludge to form a larger floc to improve the sedimentation property of the sludge. The pre-treated and tempered sludge is piped to a concentrating device 103 downstream of the pre-conditioning device, and in the concentrating device, the sludge floc is separated from the water by sedimentation, thereby concentrating the liquid. The sludge is transported to a downstream quenching and tempering device. The concentrating device may also be a device in the form of a gravity concentrator, a centrifugal concentrator or a belt concentrator. The tempering unit (or secondary tempering unit) 104 then transfers the concentrated sludge to the respective units to carry out the subsequent sludge treatment process in the order mentioned above.

A preferred embodiment of the drying unit 107 of the sludge drying system 1 shown in Fig. 1 is shown in Figs. 2 and 3, respectively, in longitudinal and transverse cross-sections. The drying device 107 is a bottom-type sludge drying device in a monomer form, and includes a first drying chamber 6a, a second drying chamber 6b, and a partition wall 4 separating the first drying chamber 6a and the second drying chamber 6b. . A communication port 5 communicating with the first drying chamber 6a and the second drying chamber 6b is formed on the partition wall 4 to allow the drying gas to enter the first drying chamber through the communication port 5. The sludge is dried in 6a.

Figure 2 shows a preferred embodiment of the bottom dry sludge drying apparatus of the present invention, and Figure 3 is a transverse cross-sectional view of the sludge drying apparatus of Figure 1, schematically showing a single form Sludge drying device. The bottom dry sludge drying device 107 includes a casing, and the casing includes an upper casing 2, a lower casing 4a, and an upper cover (or cover) 3. The bottom of the upper casing 2 serves as a partition wall 4 that partitions the internal space of the casing into the first drying chamber 6a and the second drying chamber 6b. The upper casing 2 and the upper cover 3 constitute a first drying chamber 6a, and the lower casing 4a and the bottom of the upper casing 2, that is, the partition wall constitute a second drying chamber 6b. A communication port 5 for communicating the first drying chamber 6a and the second drying chamber 6b is formed on the partition wall 4 to enable the drying gas to enter the first drying chamber 6a from the second drying chamber 6b. As shown, although the first drying chamber 6a and the second drying chamber 6b are arranged one above the other, other arrangements are possible. However, the housing may be constructed of a plurality of components or a plurality of ways, for example, the illustrated side wall of the upper housing 2 may be manufactured separately from the partition wall 4, wherein the plate member may be used as a partition plate instead of The partition wall and the partition plate are mounted on the side wall, and the side wall, the partition plate, and the lower case 4a may also be assembled. Further, it is also possible to integrally form the lower casing 4a with the partition wall 4, and to cancel the bottom of the lower casing, the lower casing 4a on the floor B, and the like. The shape of the housing is rectangular, but it can also be square, polygonal, elliptical or other shapes.

As shown in the figure, on the upper cover 3 of the casing, a feed port 8 for allowing the sludge to be dried or dried to enter the first drying chamber and a row of exhaust gas or dry gas for discharging the dried sludge are respectively provided. Air port 10, while A discharge port 9 for the dried sludge is provided on the end wall of the upper casing 2 near the partition wall 4 of the feed port 8. In other embodiments, the feed port 8 and the exhaust port 10 for the first drying chamber may be disposed at any position on one of the upper casing 2 and the upper cover 3, that is, the first drying chamber, as needed. Any position of the upper part of 6a. Likewise, the discharge opening 9 can be provided at any position of the circumferential wall of the upper casing 2 including the side walls and the end walls, that is, any position of the circumferential wall of the first drying chamber 6a.

Fig. 4 shows the internal configuration of the sludge drying device of Fig. 1. Two rows of communication ports 5 are formed at the bottom of the first drying chamber 6a, that is, the partition wall 4, and a plurality of spaced-apart communication ports 5 are arranged in each row, but each of the plurality of communication ports in one of the rows is connected. A bridge 401 is provided above. In addition to the illustrated rectangular shape, the communication port 5 can have various shapes such as a trapezoid, a rectangle, a triangle, an arch, a circle, and the like. The longitudinal direction X of each of the communication ports 5 intersects with the longitudinal direction G of the casing, preferably perpendicular to each other, and therefore, the plurality of communication ports 5 in a row intersect or substantially parallel with the longitudinal direction G of the casing.

Two tumbling means 7a, 7b for tumbling the sludge are arranged in parallel in the longitudinal direction G of the housing in the first drying chamber. Since the two flipping devices 7a, 7b have the same or similar configuration, only one of the flipping devices such as the flipping device 7a will be described in detail. Referring to Figures 2-4, the flipping device 7a has a rotating shaft 701a and a flipping assembly 702a fixed to the rotating shaft 701a for turning the sludge. The flip assembly 702a includes four vanes or ratchets 703a, and each vane or ratchet 703a extends radially outward from the rotational axis 701a. However, each of the blades of the flipping assembly 702a or The lengths of the ratchet teeth 703a extending from the rotating shaft 701a may be different from each other, and at least one of the plurality of flipping assemblies 702a may have longer length blades or ratchets, while other flipping assemblies may have shorter length blades. Or ratchet. Preferably, each flipping assembly of the plurality of flipping assemblies 702a on the rotating shaft 701a respectively corresponds to each of the plurality of communicating ports 5, and generally the tip end surface of the blade or ratchet 703a on the flipping assembly The communication port 5 is formed, and the length of the blade or the ratchet 703a is configured such that its front end or the tip end can scrape the sludge in or near the communication port, so that the dry gas in the second drying chamber 6b can smoothly pass through the communication port. 5 enters the first drying chamber 6a.

Although the drying gas (shown by the arrow) enters the first drying chamber 6a from the second drying chamber 6b through the communication port 5 on the partition wall 4, and is discharged from the exhaust port 10 after interacting with the sludge to increase drying The opportunity for gas to come into contact with the sludge. However, after the sludge to be dried is discharged into the first drying chamber 6a through the feed port 8 and stacked on the partition wall 4, with the turning of the turning members 702a, 702b of the turning devices 7a, 7b and the action of the drying gas A part of the sludge may be dropped from the first drying chamber 6a or leaked into the second drying chamber 6b through the communication port 5. In order to reduce the leakage of the sludge, the bridge member 401 is disposed above the communication port 5 to block the leakage of the sludge through the communication port to the second drying chamber 6b by the bridge member 401. As shown, a bridge 401 is provided above each of the plurality of communication ports of the other row. The bridge 401 is disposed to straddle the communication port 5 in the longitudinal direction X of the communication port and is substantially parallel to the longitudinal direction of the communication port 5. The length of the bridge 401 is longer than the length of the communication port 5, so that the bridge 401 can be like a bridge The sample straddles the communication port 5 in the longitudinal direction of the communication port 5, and both ends thereof are respectively fixed to the partition wall 4 near the end edge of the communication port. Since the intermediate section of the bridge 401 is located above the communication port 5, a side opening 402 is formed between the bridge 401 and the partition wall 4, and a side opening 402 may be formed on one side of the bridge 401 or in each of them. One side opening 402 is formed on one side. Therefore, the opening direction of the side opening 402 is substantially parallel to the axial direction of the rotating shaft or the longitudinal direction G of the housing. The bridge 401 above the communication port 5 is advantageous for reducing the sludge from falling or leaking from the first drying chamber 6a to the second drying chamber 6b, but the sludge accumulated near the side opening also interferes with the drying gas from the second drying. The chamber 6b enters the first drying chamber 6a. In order to promote the flow of the drying gas, each of the flipping assembly 702b of the flipping device 7b is formed such that the leading end of the blade or ratchet 703b or the side edge of the leading end can scrape the sludge near the side opening 402 of the bridge 401. The spacing of the flipping assemblies 702a, 702b of the flipping devices 7a, 7b on the rotating shafts 701a, 701b can be determined in accordance with the distance between the plurality of communicating ports or the bridges in each row on the partition wall 4 to rotate on the rotating shaft The sludge near each communication port or bridge can be scraped off by the tips of the blades or ratchets of the flip assembly. In short, the position of the communication port or the bridge on the partition wall is associated with the position of the flipping assembly on the rotating shaft, but the number of the flipping assemblies 702a, 702b and the number of the communicating ports 5 or the bridges 401 thereon need not be one. A correspondence.

As shown in Fig. 3, the partition wall 4 between the first drying chamber 6a and the second drying chamber 6b has a concave upper surface. The upper surface of the partition wall 4 has a concave shape when viewed in a direction transverse to the longitudinal direction G of the casing, that is, a curved section of the concave surface from the first drying chamber 6a toward the second The drying chamber 6b protrudes downward, or the first drying chamber 6a has a concave bottom. Therefore, the partition wall is shown as a recessed area in the longitudinal direction G of the casing. As shown, the area of the curved partition wall 4 facing each of the two flipping devices 7a, 7b is concave, preferably each recessed area corresponds to the flipping assembly 702a or 702b and is concave. The area can be circular. The bridge member disposed above the communication port may be a plate member including a flat plate, a curved plate, a herringbone plate, or the like.

Figure 5 shows a preferred embodiment of the bridge on the dividing wall. The bridge 401 of the flat plate is located above the communication port 5 and is parallel to the communication port in the longitudinal direction, thereby forming a side opening 402 between the bridge 401 and the partition wall 4. If the depressed area of the partition wall 4 is a circular arc shape, the shape of the side opening 402 assumes a crescent shape. Therefore, the shape of the side opening 402 depends on the shape of the bridge 401 and the depressed area of the partition wall.

Figure 6 shows an enlarged cross-sectional view of the portion A circled in Figure 2, wherein the flipping assembly of the flipping device is shown adjacent a side opening. The bridge member 401 of the flat plate is located above the communication port 5 and has two side openings 402 formed on both sides thereof with the partition wall. The drying gas as indicated by the arrow enters the communication port 5 from below the partition wall 4, that is, the second drying chamber 6b, and needs to be turned to pass through the left or right opening 402 to reach the first drying chamber 6a. Therefore, there is at least one curved path from the communication port to the side opening between the first drying chamber and the second drying chamber in order to reduce leakage of sludge from the first drying chamber to the second drying chamber. The flipping assembly 702b of the flipping device 7b is positioned such that the leading end of its blade or ratchet can scrape the sludge near the one of the side openings 402 between the bridge 401 and the dividing wall 4, while the opposite side is attached The scraping of the near sludge is not only advantageous for reducing the leakage of the sludge, but also for the flow of the drying gas from the first drying chamber to the second drying chamber. In another embodiment, a scrapable component can be mounted on the blade or ratchet of the flip assembly to scrape the sludge near the side opening with the front end of the scrapable component. In still another embodiment, a side baffle may be provided on one side of the bridge 401 to block one of the side openings, while leaving only the other side opening to allow the drying gas to enter the first drying chamber 6a in one direction . The side dam is disposed in the side opening 402 along the length of the bridge 401 to prevent dry gas from passing therethrough, so that the flipping assembly 702 of the flipping device 7 can only scrape the sludge near the other side opening 402. This arrangement of the baffles is such that the drying gas flows out of the side opening 402 into the first drying chamber 6a in only one direction, while preventing the drying gas from entering the first drying chamber from the opposite direction to prevent the sludge from leaking therefrom.

Referring to Figures 2-4, in two flipping devices 7a, 7b interlaced with each other, the scraping front end of the blade or ratchet of the first flipping assembly 702a on the first rotating shaft 701a is adjacent to the second rotational axis. 701b is located between two adjacent second flipping assemblies 702b, and vice versa. This shortens the spacing between the first rotational axis 701a and the second rotational axis 701b and also avoids interference between the first flipping assembly 702a and the second flipping component 702b. In another embodiment, the partition wall 4 may be configured to form only a plurality of communication ports 5 thereon, and the plurality of flipping assemblies 702a, 702b of each of the flipping devices 7a, 7b respectively correspond to the plurality of communication ports 5 The scrapable front end of the blades or ratchets 703a, 703b of the flipping assemblies 702a, 702b can scrape the sludge in or near the communication port 5. It is also possible to provide a bridge 401 above the communication port 5, and the plurality of flipping assemblies 702a, 702b of each of the flipping devices 7a, 7b respectively correspond to the plurality of bridge members 401 so as to flip the blades of the components 702a, 702b or The side edges of the scrapable front ends of the ratchet teeth 703a, 703b can scrape the sludge in the vicinity of the side opening 402 to smoothly flow the dry gas into the first drying chamber 6a. In addition to the scraping action, the blades or ratchets 703a, 703b of the flipping assemblies 702a, 702b also function to shear, break and flip the sludge. In another embodiment, the scrapable member can be mounted on the blade or ratchet so that the front end of the scrapable member can scrape the sludge near the communication port or side opening.

Referring to Fig. 2, one end of the rotating shafts 701a, 701b of the two flipping devices 7a, 7b may be respectively provided with a power input member. The transmission is driven by an external power unit, and the transmission sequentially drives the rotation shafts 701a, 701b to rotate such that a power input member such as a gear or pulley 18a on the rotation shafts 701a, 701b drives one of the two rotation shafts 701a, 701b, thereby The other rotating shaft rotates. The first rotating shaft 701a and the second rotating shaft 701b may be rotated in opposite directions with respect to each other or may be rotated together in the same direction.

Figure 7 shows a preferred embodiment of the rotational trajectory of the blade or ratchet tip on the flipping assembly of the flipping device through the concave portion of the curved dividing wall 4. The blade or ratchet 703b has a circular rotational trajectory, and when the tip end of the blade or ratchet 703b is swept along the curved surface of the partition wall 4, the tip of the blade or ratchet 703b is adjacent to the partition wall 4 near the communication port 5. The distances of the surfaces are approximately equal. This curved shape contributes to the scrapable front end of the blade or ratchet of the flipping assembly or to the blade or ratchet After the side edge of the front end of the scraping member sweeps over the side opening 402 to remove the sludge in the vicinity thereof, the scraped and turned-up sludge is more likely to fall back along the concave curved contour of the partition wall to the first drying chamber. The lower position within 6a increases the frequency of contact of the dry gas with the sludge. Preferably, the contour of the inner surface of the concave portion of the partition wall 4 in the lateral direction and the scrapable tip of the blade or ratchet 703a, 703b of the flipping assembly 702a, 702b of each of the flipping devices 7a, 7b or thereon The rotational path of the tip of the mounted scrapable member is similar, that is, the radius R of the curved partition plate facing the concave arcuate region of the flipping device is slightly larger than the distance r from the axis of the rotating shaft to the tip end of the flipping assembly.

As shown in Figures 2 and 3, the second drying chamber 6b includes an air inlet 15 provided on a side wall of the lower casing 4a, that is, the air inlet 15 is located on the side wall of the second drying chamber 6b for use in drying. The dry gas of the mud enters the second drying chamber 6b, and the air inlet may be one or more. Although the scraping front end of the blade or ratchet 703a, 703b of the flipping assembly 702a, 702b or the front end of the scrapable member fixed to the blade or ratchet is open to the side of the communication port 5 or the bridge 401 above the communication port The scraping of the sludge near 402 helps to reduce the sludge in the first drying chamber 6a from falling into the second drying chamber 6b, but there may still be some sludge passing through the communication port 5 or from the side opening to the communication port. The curved path leaks into the second drying chamber 6b. In order to remove the sludge leaking into the second drying chamber 6b, a cleaning port 15a is provided on the end wall of the lower casing 4a, wherein the cleaning port 15a serves to discharge the sludge deposited in the second drying chamber 6b. In addition, a discharge device may be disposed at a position near the bottom in the second drying chamber 6b to transfer the sludge to The cleaning port 15a at one end of the second drying chamber 6b is discharged from the casing. The second drying chamber 6b is substantially funnel-shaped in the lateral direction, and the side wall thereof, that is, the side wall of the lower casing 4a is gradually narrowed from the partition wall toward the bottom, and the shape at the narrowed portion, that is, the bottom portion is curved or semicircular. Thus, a longitudinal passage of an arcuate cross section is formed at the bottom of the second drying chamber 6b. The sludge leaking from the first drying chamber 6a by the curved path from the side opening to the communication port may be collected into the longitudinal passage of the curved section so as to be conveniently discharged to the casing by the discharge device provided in the longitudinal passage outer. The sludge leaking into the second drying chamber 6b may be dried or secondarily dried by the drying gas entering the second drying chamber 6b to further reduce the moisture content of the sludge. In order to maintain the relative sealing of the second drying chamber 6b, a movable baffle may be provided at the cleaning port 15a so that the drying gas does not leak, and the movable baffle is opened when the sludge is discharged.

The sludge drying system 1 further includes an air blowing device 12. The drying device 107 communicates with the air blowing device 12 via the air inlet 15 through a connecting pipe indicated by a double line, wherein the air blowing device 12 can blow the drying gas to be dried sludge to the drying device 107 in the direction of the arrow. Two drying chambers 6b.

The sludge drying system 1 may further include a drafting device 13, a heating device 108, or a heat exchange device 109. As shown in FIG. 1, if it is necessary to blow the hot dry gas into the second drying chamber 6b, a heating device 108 may be provided at a position downstream of the air blowing device 12 to supply the drying device 107 with the heated drying gas. The air guiding device 13 may be disposed at a position downstream of the drying device 107 to allow the exhaust gas or the drying gas after the drying sludge to flow out from the first drying chamber 6a as quickly as possible. The heat exchange device 109 can be combined with the air blowing device 12 The wind unit 13 is associated with the hot end of the heat exchange unit 109 connected to the blower unit 12 and the cold end of which is connected to the draft unit 13. Thus, the exhaust gas from the air introducing means 13 is passed through the cold end of the heat exchange means 109, and the dry gas which is to enter the outside of the air blowing means 12 is passed through the hot end of the heat exchange means 109, so that the heat exchange means 109 is exchanged by heat. The component recovers heat from the exhaust gas and transfers the heat to the drying gas for the sludge to be dried to enter the air blowing device 12 to improve thermal efficiency.

Referring to Figures 1 and 3, the air blowing device 12 communicates with the second drying chamber 6b via a duct and an air inlet 15 to blow dry gas into the second drying chamber 6b. The air guiding device 13 communicates with the first drying chamber 6a via a duct and an exhaust port 10. The drying gas delivered into the second drying chamber 6b may be a drying medium such as a hot gas, a chemical-containing gas, hot air, a normal temperature gas or a freezing gas, or a specially prepared drying medium. The air blowing means 12 can be used to increase the speed at which the drying gas flows into the second drying chamber 6b, and the air guiding means 13 can accelerate the outflow of the exhaust gas from the first drying chamber 6a. Typically, the air blowing device may be a blower or a fan, and the air guiding device may be an induced draft fan. Alternatively, the air blowing device 12 may be replaced with a supercharging device to deliver the drying gas to the second drying chamber 6b at a certain pressure, so that the drying gas is accelerated to flow into the first drying chamber 6a. It is also possible to replace the air guiding device 13 with a pressure reducing device to speed up the flow of the exhaust gas, thereby improving the sludge drying efficiency. The heating device (not shown) may be provided separately or integrated with the air blowing device. Further, the heated drying gas is sent to the second drying chamber 6b by the air blowing device or the charging device to re-dry the sludge therein. The heated dry gas pair drops or leaks to the first While the sludge in the second drying chamber 6b is subjected to secondary drying, a part of the heat may be transferred to the sludge laid on the partition wall 4 by the upper casing 2 and the partition wall 4 made of a metal material. The sludge in the first drying chamber 6a functions as an auxiliary drying.

Figure 8 illustrates a sludge drying process or process of the present invention. As described above, the sludge drying system 1 of the present invention can directly obtain sludge having a moisture content of about 40% or less after a series of sludge treatment and drying of the sludge having a moisture content of about 90% or more. In the sludge drying process, the moisture content of the sludge is gradually reduced at each treatment stage. The sludge drying method using the sludge drying system 1 can be applied to treat liquid sludge having different water content of 90% or more. For example, after detecting the moisture content of the sludge, the conveying step 101a can be carried out, and the conveying device 101 can be used. The liquid sludge is sent to the tempering device or the secondary tempering device 104 for quenching and tempering treatment. In the tempering step 104a, the organic tempering agent is mixed with the sludge to make the liquid sludge suitable for mechanical dewatering, and the tempered sludge is sent to the downstream dewatering device 105. In the dehydration step 105a, the tempered sludge is mechanically dehydrated by a dehydration device, and the sludge filtered out is discharged to leave a sludge which becomes a solid block, wherein the moisture content of the lump sludge is about It is 40-60%, and the dehydrated bulk sludge is sent to a drying device for drying. In the drying step 107a, the bulk sludge is conveyed to the first drying chamber of the drying device 107, and the sludge is sheared, broken and turned by the turning assembly of the turning device, and the second drying is performed through the communication port or the side opening. The drying gas entering the first drying chamber contacts the sludge and the scraping front end of the blade or ratchet of the flipping assembly is connected to the sludge near the communication port or the side opening The scrape is scraped and the sludge is fully dried. The dried sludge is discharged to the drying device by performing the discharging step 9a. If desired, the liquid sludge can be conveyed by the conveying device 101 to the pre-conditioning apparatus 102 and the concentration unit 103 to carry out the pre-conditioning step 102a and the concentration step 103a. In the pre-conditioning step 102a, the organic tempering agent is mixed with the sludge to promote the formation of the sludge floc, and in the concentration step 103a, the sludge floc is separated from the moisture to reduce the moisture content of the sludge. The concentrated sludge is then conveyed to a conditioning step 104a as described above to carry out a subsequent drying process. Further, in order to sufficiently dry the sludge, the dehydrated bulk sludge can be crushed. Therefore, the crushing step 106a can be carried out before the drying step 107a. In the crushing step 106a, the crushing device 106 breaks the dehydrated bulk sludge into small pieces or pieces of similar size so that the individual pieces are uniformly heated during the drying process. Further, in the drying process of the sludge, it is necessary to carry out the blasting step 12b in which the drying gas is introduced into the air blowing device 12, and the drying gas is blown by the air blowing device 12 to the air inlet 15 of the second drying chamber 6b. In another embodiment, a draft step 13b can be implemented by which the exhaust gas is recovered from the exhaust port 10 of the first drying chamber for delivery to subsequent processing equipment. A heating step 108a can also be implemented to cause an external drying gas to flow through the heating device 108 to heat the drying gas to a desired temperature. It is also possible to carry out a heat recovery step 109a for conveying the off-gas recovered by the air introducing means 13 to the cold end of the heat exchange means 109, and transferring the heat in the exhaust gas to the dry gas flowing to the hot end of the heat exchange means 109 by the heat exchange process, thereby It can increase the utilization rate of waste heat.

Figure 9 shows sludge drying by means of a drying device 107 The process of a process or method. In connection with Figures 2 and 3, the sludge drying process can be carried out by means of the various devices illustrated. The dewatered sludge or crushed sludge is fed by the conveying means through the feeding step 8a to the first drying chamber 6a of the drying device 107 (shown by the broken line portion). In the flipping and scraping step 107a1, an external power unit (not shown) drives the rotating shafts 701a, 701b to rotate by a transmission and a power input member such as the power input member 18b, thereby driving the flipping assemblies 702a, 702b to rotate. Each blade or ratchet 703a, 703b of the flip assembly continuously flips the sludge. While the flipping assembly is continuously sheared and broken, the scraping front end of the blade or ratchet 702a, 702b of the flipping assembly 701a, 701b or the side edge of the front end of the scraping member mounted on the blade or ratchet is fixed. The sludge in the vicinity of the communication port 5 or the side opening 402 is scraped off at intervals. At the same time, the air intake step 15b is carried out, and the dry gas is supplied from the air blowing device 12 through the duct and the air inlet 15 to the second drying chamber 6b of the drying device 107. The flow rate of the drying gas into the second drying chamber 6b is associated with the blowing speed. The front end of the blade or ratchet 702a, 702b of the flipping assembly or the front end of the scrapable member mounted on the blade or the ratchet scrapes off the sludge in the vicinity of the communication port or side opening 402 so that the dry gas smoothly flows into the first drying Room 6a. As the blades or ratchets 702a, 702b of the flipping assembly in the first drying chamber 6a shear, crush and tumbling the sludge and the drying of the drying gas to the sludge, the granularity of the sludge gradually becomes smaller and the powder is granulated. Therefore, the degree of drying of the sludge is also continuously increased. After the drying of the sludge is completed, the drying gas is transported to the atmosphere or the heat exchange device 107 by the air introducing means 13 through the exhaust port 10 located at the upper portion of the first drying chamber 6a and the duct in the exhausting step 10a. Step 9a will dry The sludge is discharged from the discharge port 9. Further, in the secondary drying or re-drying step 107a2 of the sludge, the drying gas delivered into the second drying chamber 6b by the air blowing device 12 leaks to the curved path through the communication port 5 or from the communication port to the side opening. The sludge in the two drying chambers is subjected to secondary drying to further reduce the moisture content of the sludge. In the discharging step 9a and the cleaning step, the dried sludge and the secondary dried sludge can be transported to the sludge collecting device by the discharge port 9 of the first drying chamber and the cleaning port 15a of the second drying chamber, respectively. . Further, the feeding step 8a, the tumbling and scraping step 107a, the intake step 15b, the venting step 10a, and the secondary drying or re-drying step 107a2 may be carried out sequentially or simultaneously.

In the present application, although a plurality of preferred embodiments are listed, the present invention is not limited to the contents mentioned in the specification, and those skilled in the art can fully dry the bottom dry sludge of the present invention by the above design idea of the present invention. Variations and modifications are made to the various components or devices in the device, and such changes or modifications are within the scope of the inventive concept.

1‧‧‧Sludge drying system

5‧‧‧Connected

6a‧‧‧First drying room

6b‧‧‧Second drying room

8‧‧‧ Feed inlet

9‧‧‧Outlet

10‧‧‧Exhaust port

12‧‧‧Blowing device

13‧‧‧Air intake

15‧‧‧air inlet

101‧‧‧Conveyor

102‧‧‧Pre-conditioning equipment

103‧‧‧concentrator

104‧‧‧Qualification device

105‧‧‧Dehydration device

106‧‧‧Crushing device

107‧‧‧Drying device

108‧‧‧ heating device

109‧‧‧Heat exchange unit

Claims (10)

A sludge drying system comprising: a conveying device for receiving and conveying sludge; a tempering device, the tempering device being located downstream of the conveying device, and being transported therein The sludge of the device is mixed with a tempering agent to improve dehydration of the sludge; and a dewatering device that dehydrates the sludge from the upstream to reduce the moisture content of the sludge; a drying device, the drying device comprising: a casing, wherein the casing has a partition wall to divide a space inside the casing into a first drying chamber and a second drying chamber, and at the partition wall Forming at least one communication port for communicating the first drying chamber and the second drying chamber; a feed port for the sludge to be dried disposed at an upper portion of the first drying chamber and for An exhaust port of the drying gas after drying the sludge, and a discharge port for the dried sludge disposed on the circumferential wall of the first drying chamber; disposed on a side wall of the second drying chamber At least one air inlet for drying gas to be dried sludge a flipping device for turning the sludge disposed in the first drying chamber, the turning device comprising a rotating shaft and at least one flipping assembly disposed on the rotating shaft, wherein the at least one flipping assembly is scraped a sludge in the vicinity of the at least one communication port; and an air blowing device, wherein the air blowing device passes through the at least one The gas port is in communication with the second drying chamber. The sludge drying system according to claim 1, wherein the sludge drying system further includes a crushing device located downstream of the dewatering device and located upstream of the drying device, wherein the crushing device The device crushes the dewatered sludge from the upstream to facilitate the drying treatment of the sludge. The sludge drying system of claim 1 or 2, further comprising providing at least one cleaning port on an end wall of the second drying chamber. The sludge drying system according to any one of claims 1 to 3, further comprising a discharge device disposed in the second drying chamber for the first The sludge leaked into the second drying chamber by the drying chamber is discharged from the cleaning port. The sludge drying system according to any one of claims 1 to 4, wherein the tempering device comprises a mixer in which a tempering agent is mixed with sludge To improve the dewatering of the sludge. The sludge drying system according to any one of claims 1 to 5, further comprising a front tempering device, the front tempering device being located downstream of the conveying device, And mixing the sludge with the tempering agent to promote the precipitation of the sludge; and a concentrating device located upstream of the tempering device for separating the pre- conditioned sludge from the water To reduce the moisture content of the sludge. The sludge drying system according to any one of the preceding claims, wherein the dewatering device comprises a plate and frame filter press, wherein the plate and frame filter press is tempered The sludge is pressure filtered to obtain a solid sludge having a low water content. The sludge drying apparatus according to any one of the preceding claims, further comprising a heating device for heating a drying gas, wherein the heating device is located in the air blowing device Upstream or downstream. The sludge drying apparatus according to any one of the preceding claims, further comprising a drafting device, wherein the air guiding device passes through the exhaust port and the first A drying chamber is connected. A method for sludge drying by using the sludge drying system according to any one of the above claims, the method comprising the steps of: transporting liquid sludge to a tempering device by means of a conveying device, in quenching and tempering The sludge is mixed with the tempering agent to improve the dewatering property of the sludge; the tempered sludge is sent to a dehydration device for dehydration to obtain solid sludge; The block of the solid sludge is fed into the first drying chamber of the drying device; the at least one sludge turning device disposed in the first drying chamber is operated, wherein the rotating shaft on the at least one sludge turning device Rotating at least one flipping assembly such that a front end of at least one vane or ratchet on the at least one flipping assembly is scraped in the first drying chamber and Sludge near at least one communication port formed on the partition wall between the two drying chambers; and introducing a drying gas into the second drying chamber by the air blowing device and entering the second through the at least one communication port Drying room.