JP2021191997A - Drying device and drying system - Google Patents

Abstract

To reduce intensity required for an agitation shaft.SOLUTION: A drying device 10 for drying an object to be dried while stirring and conveying the dried object uses a one-axis one-driving system including: multiple stirring shafts 21 which stir and convey the object through rotation; and multiple orthogonal shaft-type and direct connection-type driving devices 41, arranged for the respective stirring shafts 21, for rotating the respective stirring shafts 21.SELECTED DRAWING: Figure 2

Description

The present invention relates to a drying device for drying an object to be dried while stirring and transporting it, and a drying system including a plurality of drying devices.

Conventionally, a drying device for transporting and drying an object to be dried such as sludge while stirring has been known. In this type of drying device, a drying chamber is formed by a casing, and a shaft (stirring) in which a plurality of paddles (blades) are provided at intervals in the longitudinal direction for stirring and transporting the object to be dried is provided in the drying chamber. Shaft) is used. Dry air is supplied to the inside of the drying chamber, the stirring shaft is formed hollow, and a heat medium is circulated inside. By rotating such a stirring shaft, the object to be dried charged into one end side of the drying chamber is dried in the process of being conveyed while being stirred toward the other end side by the rotating paddle.

In the drying chamber, the stirring effect is enhanced by arranging the two stirring shafts so that the paddles overlap each other. It is also 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 provided with a stirring shaft from the axial direction of the stirring shaft, and FIG. 9 is a partial plan view of the conventional drying device provided with the 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 to the outside of the casing. In FIG. 8, a motor 104, which is a driving device for rotationally driving the stirring shaft 103 of the drying device 102 on the left side, is provided on the left side of the drying device unit 101, and drying on the right side is provided on the right side of the drying device unit 101. A motor 104 for rotationally driving the stirring shaft 103 of the device 102 is provided. As described above, the drying device unit 101 shown in FIGS. 8 and 9 is a 4-axis 2-drive system in which the four stirring shafts 103 are driven by the two motors 104.

The motor 104 and one stirring shaft (driving 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 side stirring shaft 103 by a gear in the gearbox 107, and rotates in accordance with the rotation of the drive side stirring shaft 103.

Japanese Unexamined Patent Publication No. 2016-6371

In the conventional drying device, as shown in FIG. 8, since one motor 104 rotates and drives two stirring shafts 103, the power of the motor 104 needs to be the size required 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 side by side. In the conventional drying device, since the motor 104 is arranged outside in the width direction of each drying device 102, it is necessary to secure a space S3 for installing the motor 104 between the motor 104 and the adjacent drying device 102. Therefore, the number of drying devices that can be installed in a limited area is limited, or a large installation space is required to install a plurality of drying devices.

Further, the stirring shaft 103 and the casing forming the drying chamber are sealed with a seal 108. This seal 108 needs to be maintained regularly, but as shown in FIG. 9, one motor 104 has one of the two stirring shafts 103 as the driving side stirring shaft and the other as the driven side stirring shaft. When the drive side agitation shaft 103 is rotationally driven by the above, a gearbox 107 is required between the drive side agitation shaft 103 and the driven side agitation shaft 103, and an operator is required to move between the agitation 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 the purposes thereof 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.

The drying system of one aspect of the present invention is a drying device that dries while stirring and transporting the object to be dried, and has at least four stirring shafts that agitate and transport the object to be dried by rotating, and at least four of the above. It has a configuration provided at one end of each of the stirring shafts of the book and comprising at least four vertically extending orthogonal axis gear motors for rotating the corresponding stirring shaft.

With this configuration, a gear motor as one drive device for rotationally driving the stirring shaft is provided for one stirring shaft (one-axis one-drive method), so that a plurality of stirring shafts can be rotationally driven on one stirring shaft. No power is applied, and it is not necessary to increase the strength of each stirring shaft so that it can withstand strong power. Further, in a plurality of stirring shafts, since there is no stirring shaft (driven stirring shaft) that is driven by another stirring shaft (driving side stirring shaft), a gear that connects the driving side stirring shaft and the driven side stirring shaft becomes unnecessary. , The maintenance of the drying system becomes easy. Further, since the stirring shaft is rotated by the orthogonal axis type gear motor extending in the vertical direction, the drive device does not protrude outside in the width direction (horizontal direction) of the drying system, and the installation space of the drying system can be reduced.

In the above drying system , the at least four gear motors may rotate the at least four stirring shafts at rotation speeds independent of each other.

This configuration eliminates the need for adjustments to synchronize the rotation speeds of the plurality of gear motors provided for the plurality of stirring shafts.

In the drying apparatus, the at least four stirring shafts may be arranged parallel to each other, each of the at least four stirring shafts may be provided with a paddle, and the tip of the paddle may be adjacent to the stirring shaft. It may be arranged so as to fit between the paddles of the shaft.

With this configuration, when the rotation speeds of the adjacent stirring shafts are different, the effect of peeling off the objects to be dried adhering to the stirring shafts can be expected.

In the above drying system , the at least four gear motors may be directly connected gear motors directly connected to one end of the stirring shaft.

With this configuration, since the drive device is directly connected to the stirring shaft, it is not necessary to place the drive device on the outside in the width direction (horizontal direction) of the drying device via a chain, a belt, or the like, and the installation space of the drying device can be reduced. ..

According to the present invention, since one drive device for rotationally driving the stirring shaft is provided for one stirring shaft (one-axis one-drive method), the power for rotationally driving a plurality of stirring shafts on one stirring shaft is provided. It is not necessary to increase the strength of each stirring shaft so that it can withstand strong power.

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

Hereinafter, the drying apparatus according to the embodiment of the present invention and the drying system including the drying apparatus will be described with reference to the drawings. It should be noted that the embodiments described below show an example of the case where the present invention is carried out, and the present invention is not limited to the specific configuration described below. In carrying out the present invention, a specific configuration according to the embodiment may be appropriately adopted.

FIG. 1 is a schematic view showing an overall configuration of a drying system including the drying apparatus according to the embodiment of the present invention. The drying system is equipped with a drying device. The object to be dried by the drying system and the drying device is not particularly limited, but in this embodiment, the object to be dried is sludge, and the drying system and the drying device are applied as the sludge drying system 100 and the sludge drying device 10. This case will be described.

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

The sludge drying system 100 includes a sludge drying device 10, a cyclone 81, a dehumidifying tower 82, a dehumidifying 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 dehumidifying tower 82, the dehumidifying tower circulation pump 83, the circulation fan 84, the mist separator 85, and the preheater 86 are shared by all or a plurality of sludge drying devices 10 constituting the sludge drying system 100. Will be done.

In the sludge drying device 10, a drying chamber is formed by the casing 11. The casing 11 of the sludge drying device 10 is formed with a sludge supply port 111 for supplying sludge to the drying chamber and a dry sludge discharge port 114 for discharging the dried sludge from the drying chamber. Further, the casing 11 of the sludge drying device 10 is formed with a circulating air supply port 113 for supplying circulating air to the drying chamber and a circulating air discharging port 112 for discharging the humidified circulating air from the drying chamber. Has been done.

The sludge to be treated by the sludge drying device 10 is supplied to the drying chamber from the sludge supply port 111 by the sludge supply mechanism that supplies the sludge to the sludge drying device, and after the water is removed in the drying chamber, the sludge discharge port. It is discharged from 114. The sludge supply mechanism may be a sludge conveyor for transporting sludge or a sludge pump for pumping sludge, and the sludge discharge mechanism may be a dry sludge conveyor for transporting dried sludge. Further, the circulating air is supplied to the drying chamber from the circulating air supply port 113, contains water vapor evaporated from sludge in the drying chamber, and is discharged from the circulating air discharge port 112.

The circulating air discharged from the circulating air discharge port 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 trachea 912. The circulating air is dehumidified by the dehumidifying tower 82.

Further, a part of the water collected in the dehumidifying tower 82 is discharged to the circulation water channel 921 as described above, and a part of the water is discharged to the outside of the system through the dehumidifying tower drain pipe 925. The circulating water discharged to the circulating water channel 921 is circulated by the circulating water channel 921, the dehumidifying tower circulation pump 83, and the circulating water channel 922 and supplied to the dehumidifying tower 82 to remove water from the circulating air. Water is further supplied to the dehumidifying tower 82 through the dehumidifying tower water supply pipe 926. The circulating air dehumidified by the dehumidifying tower 82 is sent to the circulation fan 84 through the circulation trachea 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 tip 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 is returned to the drying chamber inside the casing 11 through the circulating air pipe 915 and the circulating air supply port 113 provided in the casing 11. A preheater 86 is provided in the circulating trachea 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 to the outside of the sludge drying system 100 through the exhaust pipe 916. The configuration including the cyclone 81, the dehumidifying tower 82, the circulation fan 84, the mist separator 85, the preheater 86, and the circulation trachea 911 to 915 connecting them corresponds to an exhaust circulation mechanism. In this way, the water vapor generated in the process of drying the sludge is efficiently discharged from the drying chamber by the circulating air, and the high temperature and low humidity air is returned to the drying chamber, so that the drying of the sludge can be promoted.

Inside the casing 11 (drying chamber) of the sludge drying device 10, a stirring shaft 21 (see FIG. 3) composed of a shaft 211 and a plurality of rows of paddles 212 attached to the shaft 211 is provided. In the present embodiment, the two stirring shafts 21 form a set to form the stirring and transporting mechanism 20. That is, the sludge drying device 10 is provided with two sets of stirring and transporting mechanisms 20. The sludge is conveyed from the supply side to the discharge side while being agitated by the agitation transfer mechanism 20. Each stirring shaft 21 has a hollow structure, and steam as a heat medium is supplied to the inside thereof, and the heat heats and dries the sludge that is conveyed while being stirred.

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

With the above configuration, in the sludge drying system 100, sludge is supplied into the casing 11 from the sludge supply port 111 by the sludge supply mechanism. The sludge supplied into the casing 11 is heated while being stirred and conveyed by the stirring and transporting mechanism 20, and the water contained in the sludge evaporates. The sludge dries to become dry sludge and is discharged to the outside of the casing 11 from the dry sludge discharge port 114, and is discharged to the outside of the system by the object to be dried discharge mechanism. The circulating air containing the water vapor evaporated from the sludge is discharged to the outside of the casing 11 and is returned to the inside of the casing 11 under the action of dehumidification, purification and preheating.

FIG. 2 is a plan view of the sludge drying apparatus according to the embodiment of the present invention. In FIG. 2, two sludge drying devices 10 are shown side by side in parallel. In the following, the lower side in FIG. 2 is referred to as a front surface. Further, in FIGS. 2 and 3, a part of the casing 11 is removed to expose the internal structure. FIG. 3 is a front view of the sludge drying apparatus according to the embodiment of the present invention. FIG. 4 is a right side view of the sludge drying apparatus according to the embodiment of the present invention. FIG. 5 is a left side view of the sludge drying apparatus according to the embodiment of the present invention. FIG. 6 is a cross-sectional view taken along the line AA of FIG.

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

A drying chamber is formed inside the casing 11 by the casing 11. A sludge supply port 111 is formed on the supply side of the upper surface of the casing 11 of the sludge drying device 10. Further, a dry sludge discharge port 114 for discharging the 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 sludge to be conveyed. A circulating air intake port 113 is provided on the discharge side of the upper surface of the casing 11. Further, a circulation air exhaust port 112 is provided on the supply side of the upper surface of the casing 11. The casing 11 is supported on the floor by the support legs 115.

The stirring and transporting mechanism 20 is composed of two stirring shafts 21 extending in parallel with each other (parallel in the axial direction) as a set, and is provided below the inside of the casing 11. 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 so that its extending direction (axial direction) is parallel to the longitudinal direction of the casing 11.

The stirring shaft 21 is rotated by a drive device described later. As the shaft 211 rotates, the sludge in the casing 11 is conveyed while being agitated by the paddle 212. The shaft 211 penetrates the right side surface (supply side) and the left side surface (discharge side) of the casing 11 of the sludge drying device 10 and is connected to the drive device outside the casing 11.

The shaft 211 and the paddle 212 have a hollow structure, and their internal spaces communicate with each other. 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 water vapor supplied to the internal space of the shaft 211 also circulates from the internal space of the shaft 211 to the internal space of the paddle 212.

The flow of water vapor heats the surfaces of the shaft 211 and the paddle 212. The sludge is heated by coming into contact with the shaft 211 and the paddle 212 while being agitated, and by releasing water into the circulating air flowing through the drying chamber, the sludge is gradually dried in the process of being conveyed by the agitation transfer mechanism 20.

As shown in FIG. 6, each paddle 212 has a fan 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 transfer mechanism 20, the paddles 212 attached to the respective shafts 211 overlap each other, and the tip of the paddle 21 of one stirring shaft 21 is the paddle 21 of the other stirring shaft 21. It is in between the rows of.

As shown in FIGS. 2 and 3, the perpendicular to the surface of each paddle 212 rotates about an axis perpendicular to the shaft 212. Further, a row in which two paddles 212 in the same row are rotated in the same direction and a row in which two paddles 212 in the same row are rotated in different directions are alternately arranged. That is, the paddles 212 in a plurality of rows include not only those that are tilted in the feed direction but also those that are partially tilted in the return direction. In this way, by attaching the paddle 212 diagonally and rotating the shaft 211, sludge is conveyed while being agitated.

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

As shown in FIG. 6, the bottom surface of the casing 11 is formed so that the cross section has an arc shape in accordance with the shape of the paddle 211. Since the stirring transfer mechanism 20 has two stirring shafts 21, the bottom surface is formed in an ω shape in cross section in accordance with the shape of the paddle 212 of these two stirring shafts 21. This prevents sludge from being present outside the reach of the paddle 212 and preventing such sludge from accumulating in the bottom corners of the casing 11.

The 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 dry sludge discharge port 114. In front of the dry sludge discharge port 114, a discharge adjustment mechanism 30 including a height-adjustable discharge weir 31 is provided. The dry sludge that has passed 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 stirring and transporting mechanism 20, and rises from the bottom surface at the discharge side edge (in front of the dry sludge discharge port 114) of the bottom surface that functions as a sludge receiver. The discharge weir 31 is connected to the elevating mechanism 32 at its left and right upper ends, and is pulled up or down by the elevating mechanism 32. The sludge conveyed by the stirring and conveying mechanism 20 gets 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 dry sludge can be adjusted.

As described above, the shaft 211 penetrates the casing 11 and extends to the outside of the casing 11 and is bearing on the bearing 42 on the outside of the casing 11. A seal 43 is interposed between the right side surface of the casing 11 and the shaft 211 penetrating the casing 11, and the seal 43 keeps the drying chamber in a sealed state.

The tip of the shaft 211 is connected to the drive device 41 and is rotated by driving the drive device 41. The drive device 41 is an inverter motor with a speed reducer. This inverter motor with a speed reducer is an orthogonal axis type motor installed in the vertical direction (vertical direction) at the tip portion of the shaft 211. Further, the drive device 41 is a directly connected gear motor directly connected to the shaft 211, and does not require a rotation transmission member such as a chain or a belt between the drive device 41 and the shaft 211.

Further, as described above, the sludge drying device 10 of the present embodiment has one stirring and transporting mechanism 20 composed of two stirring shafts 21, but one driving device 41 is provided for one stirring shaft 21. A one-axis, one-drive system is adopted. With this configuration, since one stirring shaft 21 is driven by one driving device 41, one stirring shaft is not driven by the driving device for driving the two stirring shafts, and each driving device 41 is not driven. It suffices to have the power to drive one stirring shaft 21, and each stirring shaft 211 may also have the strength to withstand the power to drive one stirring shaft 21.

Further, as shown in FIG. 2, the sludge drying device 10 of the present embodiment is an orthogonal axis type motor in which the driving device 41 is installed vertically, so that the driving device 41 is wider than the width of the sludge drying device 10. It does not protrude to the outside, so that the space S1 is secured on the right side of the sludge drying device 10. Workers can easily enter the space S1, and maintenance such as replacement of the seal 43 can be easily performed.

Further, the sludge drying device 10 of the present embodiment is a one-axis one-drive system using a direct-coupled motor as the drive device 41, and it is not necessary to drive a plurality of stirring shafts 21 by the drive device 41. As shown in FIG. 2, it is not necessary to install the drive device 41 so as to protrude in the parallel direction of the sludge drying device 10, and as shown in FIG. 2, the drive device 41 can be installed without protruding the width of the sludge drying device 10.

FIG. 7 is a diagram showing a state in which a plurality of sludge drying devices of 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 the present embodiment, and the right side shows the arrangement of the conventional drying unit 101. Further, in the example of FIG. 7, six machines are arranged for each of the sludge drying device 10 and the conventional drying device 102 of the present embodiment. The arrangement of the conventional drying device 102 is the same as the arrangement shown in FIG. 10, and the two drying devices 102 form a set of one drying device unit 101.

As described with reference to FIG. 10, in the conventional drying device unit 101, since the motor 104 protrudes on both sides in the width direction of the drying device unit 101, a space S3 in that portion is required, and the drying device unit 101 is required. I can't get them close enough. On the other hand, since the drying device 10 of the present embodiment is a one-axis one-driving system using an orthogonal axis type and directly connected type driving device 41, the driving device 41 exceeds the width of the sludge drying device 10. The sludge drying devices 10 can be closely spaced without protruding.

As shown in FIG. 7, in the present embodiment, six sludge drying devices 10 can be arranged in a space narrower by the area of the space S2 as compared with the conventional case, and the space S2 can be saved. In other words, it is possible to install 6 or more (about 8) sludge drying devices 10 in the space where 6 drying devices 102 have been installed in the past.

In the sludge drying device 10 of the present embodiment, each drive 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 difference in rotation speed between the two stirring shafts 21 constituting one stirring and transporting mechanism 20 can be freely set.

In the present embodiment, as described above, by setting the rotation speeds of the two stirring shafts 21 constituting one stirring and transporting mechanism 20 to be different, the sludge scraping effect at the portion where the paddle 212 overlaps can be obtained. Realize. As described above, since it is premised that the rotation speeds of the two stirring shafts 21 are different, it is not necessary to strictly match the rotation speeds in each drive device 41, and the setting is easy.

As described above, in the present embodiment, since the 1-axis 1-drive system in which one stirring shaft 21 is driven by one orthogonal-axis type and direct-coupled drive device 41 is adopted, the installation space can be reduced and maintenance can be performed. It is possible to secure a space for the stirring shaft 21, set the strength of the stirring shaft 21 to be small, and obtain various effects such as eliminating the need for strict adjustment of the rotation speed.

In the above embodiment, the sludge drying device 10 has one stirring and transporting mechanism 20, and each stirring and transporting mechanism 20 is composed of two stirring and transporting shafts 21, but the present invention is not limited to three or more. The stirring shaft 21 of the above may constitute one stirring and transporting mechanism 20, or one sludge drying device 10 may have a plurality of stirring and transporting mechanisms 20.

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 legs 20 Stirring transfer mechanism 21 Stirring shaft 211 Shaft 212 Paddle 30 Discharge adjustment mechanism 31 Discharge weir 32 Lifting mechanism 41 Driver 42 Bearing 43 Seal

Claims (4)

A drying system that dries the object to be dried while stirring and transporting it.
At least four stirring shafts that agitate and convey the object to be dried by rotating,
At least four vertically extending orthogonal axis gear motors provided at one end of each of the at least four stirring shafts and rotating the corresponding stirring shafts.
Equipped with a drying system . The drying system according to claim 1, wherein the at least four gear motors rotate the plurality of stirring shafts at rotation speeds independent of each other. The at least four stirring shafts are arranged parallel to each other.
Each of the at least four stirring shafts is equipped with a paddle.
The drying system according to claim 1 or 2, wherein the tip of the paddle is arranged so as to be inserted between the paddles of an adjacent stirring shaft. The drying system according to any one of claims 1 to 3, wherein the at least four gear motors are directly connected gear motors directly connected to one end of the stirring shaft.

Images