JP7211708B2 - Sludge drying system - Google Patents

Description

TECHNICAL FIELD The present invention relates to a drying apparatus that dries an object to be dried while stirring and conveying it, and a drying system that includes a plurality of drying apparatuses.

2. Description of the Related Art Conventionally, there has been known a drying apparatus for drying a material to be dried such as sludge while conveying the material while stirring the material. In this type of drying apparatus, a drying chamber is formed by a casing, and a shaft (stirring shaft) provided with a plurality of paddles (blades) spaced in the longitudinal direction for stirring and transporting the material to be dried is provided in the drying chamber. shaft) is used. Dry air is supplied to the interior of the drying chamber, and the agitating shaft is formed in the air and a heat medium is circulated therein. By rotating such a stirring shaft, the material to be dried put into one end of the drying chamber is dried while being stirred and conveyed toward the other end by the rotating paddle.

In the drying chamber, two stirring shafts are installed side by side so that the paddles overlap each other to enhance the stirring effect. It has also been proposed to provide three or more stirring shafts (for example, Patent Document 1). That is, the drying device has a configuration in which a plurality of stirring shafts are provided side by side.

FIG. 8 is a view of a conventional drying device with a stirring shaft viewed from the axial direction of the stirring shaft, and FIG. 9 is a partial plan view of the conventional drying device with a stirring shaft. As shown in FIGS. 8 and 9 , two drying devices 102 are configured as one drying device unit 101 , and each drying device 102 is provided with two stirring shafts 103 .

Each stirring shaft 103 penetrates the casing of the drying device 102 and extends outside the casing. In FIG. 8, the left side of the drying device unit 101 is provided with a motor 104 as a driving device for rotating the stirring shaft 103 of the left drying device 102, and the right side of the drying device unit 101 is provided with the right drying device. A motor 104 is provided for rotationally driving the stirring shaft 103 of the device 102 . Thus, the drying device unit 101 shown in FIGS. 8 and 9 is of a 4-shaft 2-drive system in which the four stirring shafts 103 are driven by two motors 104. As shown in FIG.

A motor 104 and one stirring shaft (drive-side stirring shaft) 103 are connected by a chain 105 and a sprocket 106 , and the rotation of the motor 104 is transmitted to one stirring shaft 103 . The other stirring shaft (driven stirring shaft) 103 is connected to the driven stirring shaft 103 by a gear in a gear box 107 and rotates following the rotation of the driving stirring shaft 103 .

JP-A-2016-6371

In the conventional drying apparatus, as shown in FIG. 8, one motor 104 rotates and drives two stirring shafts 103, so the power of the motor 104 needs to be large enough to drive the two stirring shafts 103. There is At this time, each stirring shaft 103 needs to have a strength that does not break even when all the power of the motor 104 is applied to one stirring shaft 103 .

FIG. 10 is a plan view showing a state in which conventional drying device units are arranged. In the conventional drying apparatus, the motor 104 is arranged outside in the width direction of each drying apparatus 102, so it is necessary to secure a space S3 for installing the motor 104 between the adjacent drying apparatuses 102. FIG. Therefore, the number of drying devices that can be installed within a limited area is limited, or a large installation space is required to install a plurality of drying devices.

Furthermore, a seal 108 seals between the stirring shaft 103 and the casing forming the drying chamber. Although this seal 108 needs to be maintained periodically, as shown in FIG. When the drive-side stirring shaft 103 is rotationally driven by the drive-side stirring shaft 103 and the driven-side stirring shaft 103, a gearbox 107 is required, and an operator can operate between the stirring shaft 103 and the casing 101. It becomes difficult to approach the portion of the seal 108, and maintenance of the seal 108 becomes difficult.

The present invention has been made in view of the above problems, and one of its purposes is to reduce the strength required for the stirring shaft. Another object of the present invention is to reduce the installation space of the drying device. Yet another object of the present invention is to facilitate maintenance of the stirring shaft.

A drying apparatus according to one aspect of the present invention is a drying apparatus that dries a material to be dried while stirring and conveying the material, and includes a plurality of stirring shafts that stir and convey the material to be dried by rotating, and the plurality of stirring shafts. and a plurality of drives for rotating the corresponding stirring shafts.

With this configuration, one driving device for rotationally driving the stirring shaft is provided for one stirring shaft (single-shaft, one-drive system), so power is applied to one stirring shaft to rotationally drive a plurality of stirring shafts. This eliminates the need to increase the strength of each stirring shaft to withstand high power. In addition, since there is no agitation shaft (driven agitation shaft) driven by another agitation shaft (drive agitation shaft) in a plurality of agitation shafts, a gear connecting the drive agitation shaft and the driven agitation shaft is not required. , the maintenance of the drying equipment becomes easier.

In the above drying apparatus, the plurality of driving devices may rotate the plurality of stirring shafts at mutually independent rotational speeds.

This configuration eliminates the need for adjustments for synchronizing the rotational speeds of the drives provided for the stirring shafts.

In the above drying apparatus, the plurality of stirring shafts may be arranged parallel to each other, each of the plurality of stirring shafts may include a paddle, and the tip of the paddle may be the paddle of the adjacent stirring shaft. may be arranged so as to enter between the

With this configuration, when the rotational speeds of the adjacent stirring shafts are different, the effect of peeling off the materials to be dried adhering to each other's stirring shafts can be expected.

In the above drying apparatus, the driving device may be a vertically extending orthogonal shaft type gear motor provided at one end of the stirring shaft.

With this configuration, since the driving device is an orthogonal shaft type gear motor extending in the vertical direction, the driving device does not protrude outside the width direction (horizontal direction) of the drying device, and the installation space of the drying device can be reduced.

In the above drying apparatus, the driving device may be a direct gear motor that is directly connected to one end of the stirring shaft.

With this configuration, the driving device is directly connected to the stirring shaft, so there is no need to place the driving device outside the width direction (horizontal direction) of the drying device via chains, belts, etc., and the installation space of the drying device can be reduced. .

A drying system according to one aspect of the present invention has a configuration in which a plurality of the drying apparatuses described above are arranged adjacent to each other.

With this configuration, it is possible to realize a drying system in which many drying devices can be installed in a relatively narrow space as a whole.

According to the present invention, since one driving device for rotationally driving the stirring shaft is provided for one stirring shaft (single-shaft, one-drive system), power for rotating and driving a plurality of stirring shafts is provided for one stirring shaft. There is no need to increase the strength of each stirring shaft to withstand high power.

FIG. 1 is a schematic diagram showing the overall configuration of a drying system including a drying apparatus according to an embodiment of the invention. FIG. 2 is a plan view of the sludge drying apparatus of the embodiment of the invention. FIG. 3 is a front view of the sludge drying device of the embodiment of the invention. FIG. 4 is a right side view of the sludge drying apparatus according to the embodiment of the invention. FIG. 5 is a left side view of the sludge drying apparatus according to the embodiment of the invention. FIG. 6 is a cross-sectional view taken along line AA of FIG. FIG. 7 is a diagram showing a state in which a plurality of sludge drying apparatuses according to the present embodiment are arranged side by side, together with a state in which a plurality of conventional drying units are arranged side by side. FIG. 8 is a view of a conventional drying device provided with a stirring shaft, viewed from the axial direction of the stirring shaft. FIG. 9 is a partial plan view of a conventional drying device with an agitating shaft. FIG. 10 is a plan view showing a state in which conventional drying device units are arranged.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a drying apparatus and a drying system including the same according to embodiments of the present invention will be described with reference to the drawings. In addition, the embodiment described below shows an example of the case of carrying out the present invention, and does not limit the present invention to the specific configuration described below. In carrying out the present invention, a specific configuration according to the embodiment may be appropriately employed.

FIG. 1 is a schematic diagram showing the overall configuration of a drying system including a drying apparatus according to an embodiment of the invention. The drying system comprises a drying device. The material to be dried by the drying system and the drying apparatus is not particularly limited, but in the present embodiment, the material to be dried is sludge, and the drying system and the drying apparatus are applied as the sludge drying system 100 and the sludge drying apparatus 10. I will explain the case where

The sludge to be dried by the sludge drying apparatus 10 of the present embodiment is dewatered sludge having a water content of about 80% after undergoing dehydration treatment. The dehydrated sludge is dried by the sludge drying device 10 to become dried sludge with a water content reduced to about 30%. The sludge drying system 100 can dry various types of sludge such as raw sludge mixed with sewage, digested sewage sludge, organic sludge, inorganic sludge, and other sludge, and can be applied to sewage treatment plants and various sludge treatment plants. Moreover, the sludge drying apparatus 10 does not need to reduce the water content to about 30%, but may reduce the water content of the sludge to be treated according to each application. Furthermore, the sludge treated by the sludge drying apparatus 10 is not limited to sludge with a water content of 80%, and sludge with a higher water content and sludge with a lower water content can also be treated by the sludge drying apparatus 10. .

The sludge drying system 100 includes a sludge drying device 10 , a cyclone 81 , a dehumidification tower 82 , a dehumidification tower circulation pump 83 , a circulation fan 84 , a mist separator 85 and a preheater 86 . Although one sludge drying device 10 is shown in FIG. 1 , the sludge drying system 100 includes a plurality of sludge drying devices 10 . The cyclone 81, the dehumidification tower 82, the dehumidification tower circulation pump 83, the circulation fan 84, the mist separator 85, and the preheater 86 are shared by all or some of the plurality of sludge drying devices 10 that constitute the sludge drying system 100. be done.

A drying chamber is formed by a casing 11 in the sludge drying apparatus 10 . The casing 11 of the sludge drying apparatus 10 is formed with a sludge supply port 111 for supplying sludge to the drying chamber and a dried sludge discharge port 114 for discharging the dried sludge from the drying chamber. Further, the casing 11 of the sludge drying apparatus 10 is formed with a circulating air supply port 113 for supplying circulating air to the drying chamber and a circulating air discharge port 112 for discharging the humidified circulating air from the drying chamber. It is

The sludge to be treated in the sludge drying apparatus 10 is supplied into the drying chamber from the sludge supply port 111 by the material-to-be-dried supply mechanism that supplies sludge to the sludge drying apparatus. 114 is discharged. The material to be dried supply mechanism may be a sludge conveyor that conveys sludge or a sludge pump that pumps up sludge, and the sludge discharge mechanism may be a dry sludge conveyor that conveys dried sludge. The circulating air is supplied into the drying chamber from the circulating air supply port 113 and discharged from the circulating air discharge port 112, including water vapor evaporated from the sludge in the drying chamber.

The circulating air discharged from the circulating air outlet 112 is supplied to the cyclone 81 through the circulating trachea 911 . The circulating air from which impurities have been removed by the cyclone 81 is further supplied to the dehumidifying tower 82 through the circulating air pipe 912 . The circulating air is dehumidified in the dehumidification tower 82 .

Also, part of the water accumulated in the dehumidification tower 82 is discharged to the circulation water line 921 as described above, and part of the water is discharged outside the system through the dehumidification tower drain pipe 925 . The circulating water discharged to the circulating water line 921 is circulated by the circulating water line 921, the dehumidifying tower circulating pump 83, and the circulating water line 922 and supplied to the dehumidifying tower 82 to remove moisture from the circulating air. Water is further supplied to the dehumidification tower 82 through a dehumidification tower water supply pipe 926 . The circulation air dehumidified in the dehumidifying tower 82 is sent to the circulation fan 84 through the circulation air pipe 913 . The circulation fan 84 causes the circulation air to flow in the circulation direction through the circulation trachea 914 .

A mist separator 85 is provided at the end of the circulation fan 84 in the circulation direction. The mist separator 85 collects and removes dust and water droplets in the circulating air. A part of the circulating air purified by the mist separator 85 passes through the circulating air pipe 915 and is returned to the drying chamber inside the casing 11 via the circulating air supply port 113 provided in the casing 11 . A preheater 86 is provided in the circulation air pipe 915, and the circulating air is heated by the preheater 86 and then returned to the drying chamber.

A part of the circulating air is discharged outside the sludge drying system 100 through the exhaust pipe 916 . The structure comprising these cyclone 81, dehumidification tower 82, circulation fan 84, mist separator 85, preheater 86, and circulation air pipes 911 to 915 connecting them corresponds to an exhaust circulation mechanism. In this manner, the circulating air efficiently discharges the water vapor generated in the process of drying the sludge from the drying chamber and returns the high-temperature and low-humidity air to the drying chamber, thereby promoting the drying of the sludge.

Inside the casing 11 (drying chamber) of the sludge drying apparatus 10, there is provided an agitating shaft 21 (see FIG. 3) consisting of a shaft 211 and a plurality of rows of paddles 212 attached to the shaft 211. As shown in FIG. In the present embodiment, two stirring shafts 21 are combined to form a stirring transport mechanism 20 . That is, the sludge drying device 10 is provided with two sets of stirring and conveying mechanisms 20 . The sludge is agitated and conveyed from the supply side to the discharge side by the agitating and conveying mechanism 20 . Each stirring shaft 21 has a hollow structure, and steam as a heat medium is supplied to the inside thereof, and the sludge conveyed while being stirred is heated by the heat and dried.

The stirring shaft 21 is formed with a steam supply port 213 for supplying steam and a steam discharge port 214 for discharging steam or condensed water. Steam is supplied to the stirring shaft 21 through a steam pipe 923, and steam or condensed water is discharged outside the system through a steam drain pipe 924 from a steam discharge port 214. The steam pipe 923 that supplies steam to the steam supply port 213 also extends to the preheater 86 and supplies steam to the preheater 86 . Steam or condensed water discharged from the preheater 86 is discharged outside the system through a steam drain pipe 927 .

With the above configuration, in the sludge drying system 100, sludge is supplied from the sludge supply port 111 into the casing 11 by the material to be dried supply mechanism. The sludge supplied into the casing 11 is heated while being stirred and transported by the stirring transport mechanism 20, and water contained in the sludge evaporates. The sludge is dried to become dried sludge, and is discharged from the casing 11 through the dried sludge discharge port 114, and discharged out of the system by the material-to-be-dried discharge mechanism. The circulating air containing water vapor evaporated from the sludge is discharged outside the casing 11, subjected to dehumidification, purification, and preheating, and then returned to the casing 11 again.

FIG. 2 is a plan view of the sludge drying apparatus of the embodiment of the invention. FIG. 2 shows two sludge drying apparatuses 10 arranged side by side. Below, the lower side in FIG. 2 is called the front. Moreover, in FIG.2 and FIG.3, a part of casing 11 is removed and the internal structure is exposed and shown. FIG. 3 is a front view of the sludge drying device of the embodiment of the invention. FIG. 4 is a right side view of the sludge drying apparatus according to the embodiment of the invention. FIG. 5 is a left side view of the sludge drying apparatus according to the embodiment of the invention. FIG. 6 is a cross-sectional view taken along line AA of FIG.

The sludge drying device 10 has a casing 11 and two stirring and conveying mechanisms 20 provided therein. The casing 11 has a substantially rectangular parallelepiped shape. In the sludge drying apparatus 10 of FIGS. 2 and 3, sludge is supplied from the right side, conveyed leftward, and discharged from the left side.

The casing 11 forms a drying chamber in its interior. A sludge supply port 111 is formed on the upper supply side of the casing 11 of the sludge drying apparatus 10 . A dry sludge discharge port 114 for discharging dry sludge is formed below the discharge side of the casing 11 . The bottom surface of the portion of the casing 11 corresponding to the stirring shaft functions as a sludge receiver for receiving the transported sludge. A circulation air intake port 113 is provided on the discharge side of the upper surface of the casing 11 . A circulating air exhaust port 112 is provided on the upper surface of the casing 11 on the supply side. The casing 11 is supported on the floor by support legs 115 .

The agitating/conveying mechanism 20 is configured by a pair of two agitating shafts 21 extending parallel to each other (the axial direction is parallel), and is provided inside the casing 11 below. In each stirring shaft 21 , a plurality of rows of paddles 212 are attached to the surface of the cylindrical shaft 211 at predetermined intervals in the axial direction of the shaft 211 . The shaft 211 is provided such that its extending direction (axial direction) is parallel to the longitudinal direction of the casing 11 .

The stirring shaft 21 is rotated by a driving device, which will be described later. As the shaft 211 rotates, the sludge in the casing 11 is conveyed while being agitated by the paddles 212 . The shaft 211 passes through the right side (supply side) and left side (discharge side) of the casing 11 of the sludge drying apparatus 10 and is connected to the driving device outside the casing 11 .

The shaft 211 and the paddle 212 have hollow structures, and their internal spaces communicate. Steam as a heat medium is supplied to the internal space from the steam supply port at the end of the shaft 211 , and steam or condensed water is discharged from the steam discharge port at the end of the shaft 211 . The steam supplied to the inner space of shaft 211 also flows from the inner space of shaft 211 to the inner space of paddle 212 .

The surfaces of the shaft 211 and the paddle 212 are heated by such circulation of water vapor. The sludge is heated by contact with the shaft 211 and the paddle 212 while being agitated, and releases water to the circulating air flowing through the drying chamber, thereby gradually drying while being conveyed by the agitating and conveying mechanism 20 .

As shown in FIG. 6, each paddle 212 has a sector shape. Two paddles 212 are attached to each row of shafts 211 . When viewed in the axial direction of the two shafts 211 in the stirring and conveying mechanism 20, the paddles 212 attached to each shaft 211 overlap each other, and the tips of the paddles 21 of one stirring shaft 21 are aligned with the paddles 21 of the other stirring shaft 21. between the rows of

As shown in FIGS. 2 and 3, the surface normal of each paddle 212 rotates about an axis perpendicular to shaft 212 . Furthermore, rows in which the two paddles 212 in the same row are rotated in the same direction and rows in which the two paddles 212 in the same row are rotated in different directions are alternately arranged. In other words, the plurality of rows of paddles 212 include not only those that are inclined in the feed direction, but also those that are partially inclined in the return direction. By attaching the paddle 212 obliquely and rotating the shaft 211 in this manner, the sludge is conveyed while being agitated.

Further, as shown in FIG. 6, the directions of rotation of the two stirring shafts 21 constituting one stirring transport mechanism 20 are opposite to each other. Furthermore, as will be described later, the two stirring shafts 21 rotate at respective rotational speeds set independently of each other. Since the rotational speeds of the two stirring shafts 21 are different from each other, the sludge adhering to each paddle 212 is scraped off due to the difference in speed of each paddle 212 where the paddles 212 overlap.

As shown in FIG. 6, the bottom surface of the casing 11 is formed to have an arc-shaped cross section in accordance with the shape of the paddle 211 . Since the stirring and conveying mechanism 20 has two stirring shafts 21 , the bottom surface is formed to have an omega-shaped cross section in accordance with the shapes of the paddles 212 of these two stirring shafts 21 . This ensures that there is no sludge out of reach of the paddle 212 and such sludge is prevented from accumulating in the bottom corners of the casing 11 .

Sludge supplied from the sludge supply port 111 to the drying chamber in the casing 11 is conveyed from the supply side to the discharge side by the rotation of the stirring shaft 21 and discharged from the dried sludge discharge port 114 . A discharge adjustment mechanism 30 including a height-adjustable discharge weir 31 is provided in front of the dried sludge discharge port 114 . The dry sludge that has climbed over the discharge weir 31 is discharged from the dry sludge discharge port 114 .

The discharge weir 31 is provided perpendicular to the axial direction of the agitating and conveying mechanism 20, and rises from the bottom at the discharge-side edge (before the dry sludge discharge port 114) of the bottom that functions as a sludge receiver. The discharge weir 31 is connected to an elevating mechanism 32 at its left and right upper ends, and is raised or lowered by the elevating mechanism 32 . The sludge conveyed by the stirring and conveying mechanism 20 climbs over the discharge weir 31 and falls into the dry sludge discharge port 114 . By adjusting the height of the discharge weir 31 by the elevating mechanism 32, the discharge amount of dried sludge can be adjusted.

As described above, the shaft 211 extends through the casing 11 to the outside of the casing 11 and is supported by the bearings 42 outside the casing 11 . A seal 43 is interposed between the right side of the casing 11 and the shaft 211 passing therethrough, and the seal 43 keeps the drying chamber sealed.

The tip of the shaft 211 is connected to the driving device 41 and is rotated by driving the driving device 41 . The driving device 41 is an inverter motor with a reduction gear. This inverter motor with a speed reducer is an orthogonal shaft type motor installed vertically (vertically) at the tip of the shaft 211 . Further, the driving device 41 is a direct-coupled gear motor that is directly connected to the shaft 211 and does not require a rotation transmission member such as a chain or belt between the driving device 41 and the shaft 211 .

Further, as described above, the sludge drying apparatus 10 of the present embodiment has one agitating and conveying mechanism 20 composed of two agitating shafts 21, but one driving device 41 is provided for one agitating shaft 21. A 1-axis 1-drive system is adopted. With this configuration, one stirring shaft 21 is driven by one driving device 41, so that one stirring shaft is not driven by a driving device for driving two stirring shafts, and each driving device 41 has power for driving one stirring shaft 21 , and each stirring shaft 211 also has strength to withstand the power for driving one stirring shaft 21 .

In addition, as shown in FIG. 2, the sludge drying apparatus 10 of the present embodiment is an orthogonal shaft type motor in which the driving device 41 is installed vertically. The space S1 is secured on the right side of the sludge drying device 10 because it does not protrude outside. A worker can easily enter this space S1, and can easily perform maintenance such as replacement of the seal 43, for example.

Further, the sludge drying apparatus 10 of the present embodiment is a one-shaft one-drive system using a direct-coupled motor as the drive device 41, and there is no need to drive a plurality of stirring shafts 21 by the drive device 41. Therefore, as shown in FIG. 2, the driving device 41 does not need to be installed in the parallel direction of the sludge drying device 10, and the driving device 41 can be installed without protruding the width of the sludge drying device 10 as shown in FIG.

FIG. 7 is a diagram showing a state in which a plurality of sludge drying apparatuses according to the present embodiment are arranged side by side, together with a state in which a plurality of conventional drying units are arranged side by side. The left side of FIG. 7 shows the arrangement of the sludge drying apparatus 10 of this embodiment, and the right side shows the arrangement of the conventional drying unit 101 . In addition, in the example of FIG. 7, six of each of the sludge drying apparatus 10 of the present embodiment and the conventional drying apparatus 102 are arranged. The arrangement of the conventional drying devices 102 is the same as the arrangement shown in FIG.

As described with reference to FIG. 10, in the conventional drying device unit 101, the motor 104 protrudes on both sides of the drying device unit 101 in the width direction. You can't get them close enough together. On the other hand, the drying device 10 of the present embodiment is a 1-axis 1-drive system using the orthogonal shaft type and direct connection type driving device 41, so the driving device 41 exceeds the width of the sludge drying device 10 The distance between the sludge drying apparatuses 10 can be shortened without protruding.

As shown in FIG. 7, in this embodiment, six sludge drying apparatuses 10 can be arranged in a space narrower than the conventional one by the area of the space S2, and the space S2 can be saved. In other words, six or more (approximately eight) sludge drying apparatuses 10 can be installed in the space in which six drying apparatuses 102 were conventionally installed.

In the sludge drying apparatus 10 of the present embodiment, each driving device 41 can be set to a speed independent of each other, and the rotation speed of each stirring shaft 21 can be arbitrarily set. Therefore, the rotational speed difference between the two stirring shafts 21 constituting one stirring transport mechanism 20 can be freely set.

In the present embodiment, as described above, by setting the rotational speeds of the two stirring shafts 21 constituting one stirring and conveying mechanism 20 at different speeds, the effect of scraping off the sludge at the portion where the paddles 212 overlap can be improved. Realize. Since it is assumed that the rotation speeds of the two stirring shafts 21 are different, it is not necessary to strictly match the rotation speeds of the driving devices 41, and the setting is easy.

As described above, in the present embodiment, the one-shaft, one-drive system in which one stirring shaft 21 is driven by one orthogonal shaft type and direct coupling type driving device 41 is adopted, so that the installation space can be reduced, and maintenance can be reduced. Various effects can be obtained, such as securing a space for stirring, setting the strength of the stirring shaft 21 to a small value, and eliminating the need for strict adjustment of the rotation speed.

In the above embodiment, the sludge drying device 10 has one agitating and conveying mechanism 20, and each agitating and conveying mechanism 20 is composed of two agitating shafts 21. One stirring and conveying mechanism 20 may be constituted by the stirring shaft 21 of , and one sludge drying device 10 may have a plurality of stirring and conveying mechanisms 20 .

REFERENCE SIGNS LIST 100 sludge drying system 10 sludge drying device 11 casing 111 sludge supply port 112 circulating air discharge port 113 circulating air supply port 114 sludge discharge port 115 support leg 20 stirring and conveying mechanism 21 stirring shaft 211 shaft 212 paddle 30 discharge adjustment mechanism 31 discharge weir 32 lifting mechanism 41 driving device 42 bearing 43 seal

Claims (2)

A sludge drying system comprising a plurality of adjacent sludge drying devices for drying while agitating and conveying sludge,
The sludge drying device is
a plurality of agitating shafts that agitate and convey sludge by rotating;
a plurality of motors provided for each of the plurality of stirring shafts for rotating the corresponding stirring shaft without driving adjacent stirring shafts;
with
a plurality of agitation shafts adjacent to each other rotate in opposite directions;
The plurality of motors rotate the plurality of adjacent agitation shafts at independent rotation speeds;
The plurality of adjacent stirring shafts are arranged parallel to each other,
each of the plurality of adjacent stirring shafts comprises a paddle;
the tips of the paddles of the plurality of adjacent stirring shafts are arranged to enter between the paddles of other adjacent stirring shafts;
The motor is an orthogonal shaft type gear motor provided at one end of the stirring shaft and extending in the vertical direction, and is contained within the width of the sludge drying device.
Sludge drying system. The sludge drying system according to claim 1, wherein the motor is a direct-coupled gear motor directly connected to one end of the agitating shaft.

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