JP2016006371A - Drier and drying system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce and prevent a phenomenon that a dried object is unevenly placed in a direction perpendicular to a transport direction of agitation/transportation mechanisms by agitation and transportation in a dryer including the agitation/transportation mechanisms.SOLUTION: A drier 10 dries a dried object while agitating and transporting the dried object and includes: agitation/transportation mechanisms 20, each of which rotates an agitation shaft 21 to agitate and transport the dried object, and a partition plate 51 which is provided between the agitation/transportation mechanisms 20 and restricts movement of the dried object from one of the agitation/transportation mechanisms 20 to the adjacent agitation/transportation mechanism 20.

Description

  The present invention relates to a drying apparatus for drying an object to be dried while stirring and transporting, and a drying system including the drying apparatus.

  DESCRIPTION OF RELATED ART Conventionally, the drying apparatus which conveys and dries to-be-dried materials, such as sludge, is known. In this type of drying apparatus, a shaft provided with a plurality of rows of blades (paddles) is used for stirring and transporting an object to be dried. As the shaft rotates, the blades provided on the shaft also rotate around the shaft, whereby the material to be dried supplied to one end side in the axial direction of the shaft is stirred while the other end side in the axial direction of the shaft It is conveyed to. During this stirring and conveyance, the material to be dried is heated and dried.

  In this type of drying apparatus, two shafts (stirring shafts) each provided with blades are used as one set, and the blades of the two shafts are overlapped with each other, and this is used as one stirring and conveying mechanism to enhance the stirring effect. .

  When drying an object to be dried using such a drying apparatus, it is conceivable to use a plurality of drying apparatuses in order to increase the amount of treatment (the amount per hour of the object to be dried to be dried). However, when the number of drying devices is increased, it is necessary to secure a space for workers to access the drying devices during maintenance and repair, and a relatively large space is required. End up.

  The following technologies are related to the present invention.

International Publication No. 2009/044608 Japanese Patent No. 2872587 Japanese Examined Patent Publication No. 6-46137

  In order to increase the throughput, it has been proposed to provide a number of stirring shafts in one drying device. For example, it has been proposed to provide four or six rows of stirring shafts in one drying device, thereby forming two or three sets of stirring and conveying mechanisms. It is advantageous from the viewpoint of space saving to provide a large number of stirring shafts in one drying apparatus.

  However, when a plurality of agitation transport mechanisms are provided in one drying device, a difference occurs in operating conditions for each agitation transport mechanism, the drying speed and the transport speed are different, and the object to be dried moves to the adjacent agitation transport mechanism. As a result, the material to be dried is biased in the direction perpendicular to the conveying direction. Here, the difference in operating conditions means a slight shift in the number of rotations of the shaft and heat medium conditions for heating the object to be dried, a subtle difference in the shape of the shaft and blades, a bias in the amount of material to be dried, etc. It is.

  It is extremely difficult to completely eliminate such differences in operating conditions in a plurality of agitation transport mechanisms, and in many cases it is specified which of the above operating conditions is responsible for the unevenness of the material to be dried. It is also difficult to do.

  SUMMARY OF THE INVENTION An object of the present invention is to reduce or prevent a bias associated with agitation and conveyance of an object to be dried in a drying apparatus that conveys the object to be dried while stirring.

  The drying device of the present invention is a drying device that dries while agitating and conveying the object to be dried, and includes a plurality of agitation transport mechanisms that agitate and convey the object to be dried by rotating a stirring shaft; It is provided between the transport mechanisms, and has a configuration provided with an object to be dried movement limiting means for restricting movement of the object to be dried from one stirring and conveying mechanism to another adjacent stirring and conveying mechanism. .

  With this configuration, the object to be dried while being stirred and conveyed is restricted from moving from one agitating and conveying apparatus to another adjacent agitating and conveying mechanism, and the object to be dried is biased in a direction perpendicular to the conveying direction. Can be reduced or prevented. Here, the restriction on the movement of the object to be dried includes not only completely preventing the object to be dried from moving between the stirring and conveying mechanisms but also preventing the movement of the object to be dried between the agitating and conveying mechanisms.

  In the drying apparatus, a space including one agitation transport mechanism and a space including another adjacent agitation transport mechanism may communicate with each other. With this configuration, the temperature and humidity of the space including one agitation transport mechanism and the space including another adjacent agitation transport mechanism can be made comparable, and the drying conditions in the plurality of agitation conveyance mechanisms can be made equivalent. .

  In the drying apparatus, the to-be-dried object movement restriction unit may permit the movement of the to-be-dried object at a supply-side end of the to-be-dried object. With this configuration, it is possible to make the amount of the to-be-dried material to be supplied substantially equal in the adjacent agitation transport mechanisms.

  Said drying apparatus WHEREIN: The said to-be-dried object movement restriction | limiting means may be movable in the conveyance direction of the to-be-dried object by the said stirring conveyance mechanism. With this configuration, the object to be dried can be moved in a direction perpendicular to the conveying direction of the object to be dried from the supply side to the discharge side of the stirring and conveying mechanism, or the object to be dried movement limiting unit can be installed at a remarkable position.

  The drying apparatus may further include a heating unit that heats the dry matter movement restriction unit. In the drying device, drying of the object to be dried may be promoted by heating the stirring shaft or the casing, but according to this configuration, the object to be dried is also restricted by the object to be dried movement restricting means. Can promote drying.

  The drying apparatus may further include a control device that individually controls the drying conditions of each of the plurality of stirring and transporting mechanisms based on the moisture content of the material to be dried dried by the stirring and transporting mechanism. With this configuration, for example, the drying conditions of each stirring and transporting mechanism can be adjusted so that the moisture content of the objects to be dried in each stirring and transporting mechanism is equal.

In the drying apparatus, the object to be dried conveyed by the stirring and conveying mechanism may be discharged in the conveying direction of the object to be dried by the stirring and conveying mechanism. With this configuration, the moisture content of the discharged material to be discharged does not become uneven due to a short pass or delay, and uniform drying can be performed.

  In the above drying apparatus, an object receiver to be dried may be provided under the stirring and conveying mechanism, and a discharge weir that can be adjusted in height rising from the object to be dried is provided on the discharge side of the stirring and conveying mechanism. It may be. With this configuration, the moisture content of the material to be discharged can be adjusted.

  In the above-described drying device, the discharge weir may be independently adjustable in height with respect to each of the plurality of agitation transport mechanisms. By this structure, the moisture content of a to-be-dried object can be adjusted for every stirring conveyance mechanism.

  The drying apparatus further includes supply adjusting means for moving the material to be dried supplied in the drying apparatus to the discharge side of the stirring and conveying mechanism while making the material to be dried uniform in the parallel direction of the stirring and conveying mechanism. Good. With this configuration, an equal amount of material to be dried is supplied to the plurality of agitation transport mechanisms, so that the drying conditions can be made equal in this respect.

  The drying apparatus may further include a storage unit that stores the material to be dried supplied in the drying apparatus, and further includes a supply weir as the supply adjustment unit whose upper end is horizontal. The material to be dried may be supplied to the agitation transport mechanism over the upper end of the supply weir. With this configuration, the material to be dried that has passed over the supply weir is transported to the transport side.

  In the above drying apparatus, the supply adjusting means may be an adjusting plate provided above the stirring and conveying mechanism, and the object to be dried supplied into the drying apparatus is passed under the adjusting plate, You may convey to the discharge side of the said stirring conveyance mechanism. With this configuration, compared to the case where the supply weir is erected, the supplied material to be dried does not stay at the rising portion of the weir, and the supplied material to be dried can be sequentially dried.

  The drying system of the present invention includes the drying device, a drying object supply mechanism that supplies the drying object to the drying device, and a drying object discharge mechanism that discharges the drying object that has been dried from the drying device. It has the composition provided.

  Even with this configuration, the object to be dried while being stirred and conveyed is restricted from moving from one agitating and conveying apparatus to another adjacent agitating and conveying mechanism, and the object to be dried is biased in a direction perpendicular to the conveying direction. The phenomenon can be reduced or prevented.

  According to the present invention, since an object to be dried while being stirred and conveyed is restricted from moving from one agitating and conveying apparatus to another adjacent agitating and conveying mechanism, the object to be dried is perpendicular to the conveying direction. It is possible to reduce or prevent the phenomenon that is biased in the direction.

Schematic which shows the whole structure of the sludge drying system containing the sludge drying apparatus of embodiment of this invention. The top view of the sludge drying apparatus of embodiment of this invention The top view which removed the upper surface of the sludge drying apparatus of embodiment of this invention The side view which removed the right side of the sludge drying apparatus of embodiment of this invention AA sectional view of a sludge drying device of an embodiment of the invention BB sectional drawing of the sludge drying apparatus of embodiment of this invention The figure which shows the 1st modification of the to-be-dried object movement restriction | limiting means of embodiment of this invention. The figure which shows the 2nd modification of the to-be-dried object movement restriction | limiting means of embodiment of this invention. The figure which shows the 3rd modification of the to-be-dried object movement restriction | limiting means of embodiment of this invention. The figure which shows the 4th modification of the to-be-dried object movement restriction | limiting means of embodiment of this invention. The figure which shows the 5th modification of the to-be-dried object movement restriction | limiting means of embodiment of this invention. The figure which shows the 6th modification of the to-be-dried object movement restriction | limiting means of embodiment of this invention. The figure which shows the 7th modification of the to-be-dried object movement restriction | limiting means of embodiment of this invention. (A) Plan view showing a part of the sludge drying apparatus according to the modified example (b) Side view showing a part of the sludge drying apparatus according to the modified example (A) Plan view showing a part of a modified sludge drying apparatus (b) Side view showing a part of a modified sludge drying apparatus (c) CC sectional view of the modified drying apparatus Sectional drawing which shows the structure of the stirring shaft of a modification

  Embodiments of the present invention will be described below with reference to the drawings. The embodiment described below shows an example when the present invention is implemented, and the present invention is not limited to the specific configuration described below. In carrying out the present invention, specific configurations according to the respective embodiments may be appropriately employed.

  FIG. 1 is a schematic diagram showing an overall configuration of a drying system including a drying apparatus according to an embodiment of the present invention. The drying system includes a drying device. The material to be dried to be dried by the drying system and the drying device is not particularly limited. In the present embodiment, the material 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. A case where

  The sludge dried by the sludge drying apparatus 10 of the present embodiment is dehydrated sludge having a water content of about 80% after being subjected to dehydration. The dewatered sludge is dried by the sludge drying device 10 to become a dried sludge having a moisture content reduced to about 30%. 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. Moreover, the sludge drying apparatus 10 does not have to reduce the moisture content to about 30%, and may be anything that reduces the moisture 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 the sludge having a water content of 80%, and sludge having a higher water content and sludge having a lower water content can be treated by the sludge drying apparatus 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. In the sludge drying apparatus 10, a drying chamber is formed by the casing 11. 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 sludge dried 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 the circulating air to the drying chamber and a circulating air discharge port 112 for discharging the humidified circulating gas from the drying chamber. Has been.

  The sludge to be treated in the sludge drying device 10 is supplied to the drying chamber from the sludge supply port 111 by the dry matter supply mechanism that supplies the sludge to the sludge drying device, and after the moisture is removed in the drying chamber, the sludge discharge port 114 is discharged. The to-be-dried object supply mechanism may be a sludge conveyer 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. Further, the circulating air is supplied from the circulating air supply port 113 into the drying chamber and is discharged from the circulating air discharge port 112 including water vapor evaporated from the sludge in the drying chamber.

  Circulating air exhausted 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 trachea 912. The circulating air is dehumidified in the dehumidifying tower 82. Further, a part of the water accumulated in the dehumidifying tower 82 is discharged to the circulation water channel 921 as described above, and a part thereof is discharged outside 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 moisture 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 in the dehumidifying tower 82 is sent to the circulating fan 84 through the circulating 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 passes through the circulating air pipe 915 and is returned to the drying chamber inside the casing 11 through the circulating air supply port 113 provided in the casing 11. The circulating air pipe 915 is provided with a preheater 86, and the circulating air that has circulated 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. A configuration including the cyclone 81, the dehumidifying tower 82, the circulation fan 84, the mist separator 85, the preheater 86, and the circulation air pipes 911 to 915 connecting them corresponds to an exhaust circulation mechanism. Thus, the drying of the sludge can be promoted by efficiently discharging the water vapor generated in the process of drying the sludge from the drying chamber by the circulating air and returning the high-temperature and low-humidity air to the drying chamber.

  In the interior (drying chamber) of the casing 11 of the sludge drying apparatus 10, a stirring shaft 21 (see FIG. 3) including a shaft 211 and a plurality of rows of blades 212 attached to the shaft 211 is provided. In the present embodiment, the two agitation shafts 21 constitute a set to constitute the agitation transport mechanism 20. That is, the two sets of agitation transport mechanisms 20 are provided in the sludge drying apparatus 10. By this stirring and conveying mechanism 20, sludge is conveyed from the supply side to the discharge side while being stirred. Each agitation shaft 21 is supplied with steam as a heat medium, and the sludge conveyed while being agitated by the heat is heated and dried.

  The stirring shaft 21 is formed with a steam supply port 213 through which steam is supplied and a steam discharge port 214 through which steam or condensed water is discharged. Steam is supplied to the agitation shaft 21 through the steam pipe 923, and steam or condensed water is discharged from the steam outlet 214 through the steam drain pipe 924 to the outside of the system. Note that 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 out 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 dry matter supply mechanism. The sludge supplied into the casing 11 is heated while being stirred and transported by the stirring and transporting mechanism 20, and the water contained in the sludge is evaporated. The sludge is dried to become dry sludge, which is discharged out of the casing 11 from the dry sludge discharge port 114, and is discharged out of the system by the dry matter discharge mechanism. Circulating air containing water vapor evaporated from the sludge is discharged out of the casing 11 and returned to the casing 11 again 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. FIG. 3 is a diagram showing the internal structure of the plan view of FIG. 2 with the top surface of the sludge drying device removed. In the following description, the left surface of the casing 11 in FIGS. 2 and 3 is referred to as the front surface 116, the right surface is referred to as the back surface 117, the lower surface is referred to as the right surface 118, and the upper surface is referred to as the left surface 119. The surface on the back side of the paper is called the bottom surface 120, and the surface facing the bottom surface is called the top surface 121. FIG. 4 is a diagram showing the internal structure of the sludge drying apparatus except for the right side surface 118. 5 and 6 are a cross-sectional view taken along the line AA and a cross-sectional view taken along the line BB in FIG. 3, respectively. Hereinafter, with reference to FIGS. 2-6, the sludge drying apparatus 10 of embodiment of this invention is demonstrated in detail.

  The sludge drying apparatus 10 includes a casing 11 and two agitation transport mechanisms 20 provided therein. The casing 11 has a substantially rectangular parallelepiped shape. A drying chamber is formed inside the casing 11. Each stirring / conveying device 20 includes a pair of two stirring shafts 21 and is provided below the inside of the casing 11. The sludge drying apparatus 10 according to the present embodiment includes four rows of stirring shafts 21 extending in parallel to each other (parallel in the axial direction), and two stirring transport mechanisms 20 adjacent to each other as a set. Is configured. The stirring shaft 21 includes a shaft 211 and a plurality of blades 212 provided around 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. As the shaft 211 rotates, the sludge in the casing 11 is conveyed while being stirred by the blades 212. 2 to 4, the sludge is supplied from the back surface 117 side, conveyed leftward in FIGS. 2 to 4, and discharged from the front surface 116 side of the casing 11. The shaft 211 passes through the casing 11 on both sides of the back surface 117 side (supply side) and the front surface 116 side (discharge side). A bearing 12 that rotatably holds the shaft 211 is provided at one end of the shaft 211 protruding from the front surface 116 of the casing 11, and the shaft 211 can be rotated at the other end of the shaft 211 protruding from the back surface 117 of the casing 11. A bearing 12 is provided for holding the bearing. A drive mechanism 13 that rotationally drives the shaft 211 for each agitation transport mechanism 20 is provided outside the bearing 12.

  The shaft 211 is hollow, and each row of blades 212 is also hollow. The internal space of the shaft 211 and the internal space of the blade 212 communicate with each other. Steam as a heat medium is supplied from the steam supply port at one end of the shaft 211 to the internal space, and water vapor or condensed water is discharged from the steam discharge port at the other end. The water vapor supplied to the internal space of the shaft 211 is circulated from the internal space of the shaft 211 to the internal spaces of the blades 212 in each row and is discharged. The surface of the shaft 211 and the blades 212 is heated by the flow of such water vapor. The sludge is heated by coming into contact with the shaft 211 and the blades 212 while being agitated, whereby the water contained in the sludge evaporates. In this way, the sludge is gradually lost in the process of being transported by the stirring and transporting mechanism 20 and dried.

  As shown in FIGS. 2 and 3, a sludge supply port 111 is formed for each stirring and conveying mechanism 20 on the supply side of the upper surface 121 of the casing 11 of the sludge drying apparatus 10. A circulating air discharge port 112 is formed on the front 116 side of the sludge supply port 111. A casing cover 115 for opening a drying chamber formed by the casing 11 is provided on the front surface 116 side of the circulating air outlet 112. By opening the casing cover 115, the stirring shaft 21 can be cleaned and repaired.

  On the front side 116 (discharge side) of the casing 11, a circulation air inlet 113 is formed for each stirring and conveying mechanism 20. A dried sludge discharge port 114 for discharging the dried sludge is formed below the discharge side of the casing 11. The bottom surface 120 of the part corresponding to the stirring shaft 21 of the casing 11 functions as a sludge receiver that receives the sludge to be conveyed. The bottom surface 120 is formed so as to have a circular cross section in accordance with the shape of the blade 212. Since each agitation transport mechanism 20 has two agitation shafts 21, the bottom surface 120 has a cross-section 120 formed in a ω shape in accordance with the shape of the blades 212 of these two agitation shafts 21 (see FIG. 5). ). Thereby, sludge does not exist where the blades 212 do not reach, and such sludge is prevented from being accumulated at the bottom corner of the casing 11.

  In each stirring shaft 21, a plurality of rows of blades 212 are attached to the surface of a cylindrical shaft 211. Each blade 212 has a fan shape. Two blades 212 are attached to each row of the shaft 211. The stirring shaft 21 is rotated by a driving mechanism such as a speed reducer. Note that the blades 212 attached to the respective shafts 211 overlap each other when viewed in the axial direction of the two shafts 211 in each stirring and conveying mechanism 20.

  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. A discharge adjusting mechanism 30 including a discharge weir 31 whose height can be adjusted is provided in front of the dried sludge discharge port 114. The dried sludge that has passed over the discharge weir 31 is discharged from the dried sludge discharge port 114. The dried sludge discharged from the dried sludge discharge port 114 is transported by two dried sludge transport belts 500 as dry matter discharge mechanisms provided corresponding to the respective stirring transport mechanisms 20.

  The two rows of dried sludge transport belts 500 are provided with sensors 501 for detecting the moisture content of the transported dry sludge. The sensor 501 may be a sensor that estimates the moisture content by measuring the weight of dry sludge, for example. The moisture content of the dried sludge indicates how much the drying effect is obtained in each stirring and conveying mechanism 20. The sensor 501 may estimate the moisture content from the color and shape (presence / absence of a lump) by photographing the dried sludge conveyed on the dried sludge conveying belt 500 and performing image processing. The sludge drying apparatus 10 includes a control device, and controls the drying conditions in each stirring and conveying mechanism 20 based on the moisture content of the dried sludge detected by the sensor 501. The sludge drying apparatus 10 adjusts the height of the discharge weir 31, the supply amount of sludge from the sludge supply port 111, the pressure of steam supplied to the drying chamber, and the like based on the moisture content of the dry sludge, for example.

  As shown in FIG. 3 and FIG. 4, a partition plate 51 is provided between the two agitation and transport mechanisms 20 as dry matter movement restriction means. The partition plate 51 is provided from one end to the other end of the drying chamber formed by the casing 11 (from the front surface 116 to the back surface 117), and is provided in the vertical direction from the lower end to the upper end of the drying chamber. The partition plate 51 is provided between one agitation transport mechanism 20 and another agitation transport mechanism 20 adjacent thereto, so that sludge is transferred from one agitation transport mechanism 20 to another adjacent one in the course of transport. The movement to the stirring and conveying mechanism 20 is restricted. Further, since the partition plate 51 is provided, movement of sludge from one stirring / conveying mechanism 20 across the partition plate 51 to the other stirring / conveying mechanism 20 is limited. In the mechanism 20, in addition to the full operation mode in which sludge is dried under the same conditions, the operation can be performed in a partial operation mode in which sludge is dried using only one of the two agitating and conveying mechanisms 20. Alternatively, the operation can be performed in the individual setting mode for setting different drying conditions (the rotation speed of the stirring shaft 21, the moisture content of the sludge, the height of the discharge weir 31 described later, etc.) in each of the stirring and conveying mechanisms 20. .

  The drying chamber formed by the casing 11 is not completely divided into two spaces by the partition plate 51, and a space including one agitation transport mechanism 20 and a space including another agitation transport mechanism 20 adjacent thereto. Are communicated by a window 511 provided in the partition plate 51. This window 511 allows one space and the other space to communicate with each other, so that the temperature and humidity in both spaces are kept equal, and the drying conditions can be made equal in both spaces. In the example of FIG. 4, the windows 511 are rectangular and five are provided, but the shape is not limited to a rectangle, and the number of windows 511 may be more or less than five. The window 511 is provided at a position higher than the height of the sludge that is stirred and transported by the stirring and transporting mechanism 20. In the present embodiment, the window 511 is provided at a position higher than the highest position of the blades 212 provided on the shaft 211. Thereby, the sludge conveyed by the stirring and conveying mechanism 20 is prevented from leaking through the window 511 and beyond the partition plate 51 to the adjacent stirring and conveying mechanism 20 side.

  As shown in FIG. 5, the upper end of the partition plate 51 is fixed to the upper surface 121 of the casing 11, and the lower end of the partition plate 51 is fixed to the bottom surface 120 of the casing 11. As described above, the bottom surface 120 of the casing 11 has a shape that is curved along the shape of the blades 212, and the lower end of the partition plate 51 is located on the bottom surface 120 of the casing 11 on the inside of each stirring and conveying mechanism 20. It is fixed to a raised portion between the stirring shafts 21 and is erected in the vertical direction. In addition, fixation between the partition plate 51 and the casing 11 may be performed by a bolt or the like, and thereby the partition plate 51 may be removable from the casing 11. Moreover, after removing the partition plate 51, it may be possible to replace the dried object movement restricting means of various modified examples described later.

  The partition plate 51 is heated by heating means. Specifically, a heating wire passes inside the partition plate 51, and the partition plate 51 is heated by energizing the heating wire. Further, the partition plate 51 may be heated by providing a flow path through which the heat medium flows in the partition plate 51 and circulating a heat medium such as hot water through the flow path. The sludge transported while being stirred by the stirring transport mechanism 20 is also heated by the heat of the partition plate 51 to promote drying.

  Next, the discharge weir 31 will be described with reference to FIGS. As shown in FIG. 4, the discharge weir 31 is provided perpendicular to the axial direction of each stirring and conveying mechanism 20, and the discharge-side edge (dry sludge discharge) of the bottom surface 120 of the casing 11 that functions as a dried object receiver. Standing up from the bottom surface 120 at the front of the outlet 114).

  In FIG. 6, the discharge weir 31 is shown from the front, but the discharge weir 31 is connected to the lifting mechanism 32 at the upper left and right ends, and is lifted or lowered by the lifting mechanism 32. The sludge transported by the stirring transport mechanism 20 gets over the discharge weir 31 and falls to the dry sludge discharge port 114. Further, FIG. 6 shows a state where the two discharge weirs 31 are different in height and the discharge volumes of the respective agitation transport mechanisms 20 are different.

  The lower the discharge weir 31 is located, the easier the dried sludge is guided to the dried sludge discharge port 114. Accordingly, when it is desired to increase the amount of dry sludge discharged per unit time, the discharge weir 31 is lowered, and when it is desired to reduce the amount of dry sludge discharged per unit time, the discharge weir 31 is raised. By raising and lowering the discharge weir 31, it is possible to adjust the time during which the sludge is subjected to the stirring and drying processes in the drying chamber. The longer the time for which the agitation and drying treatment is performed, the more the sludge is dried and the moisture content of the dried sludge discharged from the sludge drying device 10 becomes lower. The discharge weir 31 can be raised and lowered according to the target moisture content of the sludge.

  Thus, the direction in which the dried sludge is discharged from the stirring and transporting by the stirring and transporting mechanism 20 (over the discharge weir 31) is the axial direction of the stirring shaft 21. That is, in the sludge drying apparatus 10 of the present embodiment, the dried sludge is not discharged in the direction perpendicular to the axial direction of the stirring shaft 21, but is discharged in the sludge transport direction by the stirring transport mechanism. In other words, the dried sludge discharge port 114 is provided not on the side surfaces 118 and 119 but on the front surface 116. Thereby, the moisture content of the discharged sludge does not become non-uniform due to a short pass or delay, and a homogeneous dry sludge can be obtained. In addition, it is not necessary to provide a dry sludge transport belt 500 for transporting the dried sludge discharged from the sludge dryer 10 to a crusher or the like, and space saving can be realized.

  As described above, according to the sludge drying apparatus 10 of the present embodiment, two sets of stirring and conveying mechanisms 20 (four rows of stirring shafts 21) are provided, which can dry large-capacity sludge and each stirring and conveying mechanism. Since the movement of the sludge can be limited between 20, it is possible to reduce or prevent the disadvantage that the sludge is biased and cannot be dried as desired. In the embodiment described above, the partition plate 51 having the window 511 formed thereon is provided between the stirring and conveying mechanism 20 as the object to be dried movement restricting means. It is not limited to this. For example, the partition plate 51 is provided with a window 511 to allow the space on the one stirring and conveying mechanism 20 side and the space on the other stirring and conveying mechanism 20 side to communicate with each other. It may be a closed space.

  Below, the various modifications of a to-be-dried object movement restriction | limiting means are demonstrated. FIG. 7 is a view showing a first modification of the object to be dried movement restricting means. In FIG. 7, only the casing 11 and the to-be-dried object movement restriction | limiting means are shown typically, and illustration of the other structure is abbreviate | omitted. In this modification, the to-be-dried object movement restriction means is a plurality of partition plates 52a to 52c. Each of the partition plates 52a to 52c has a rectangular shape, and is fixed to the bottom surface 120 of the casing 11 at the bottom thereof. A gap is provided between the discharge-side end of the discharge-side partition plate 52 a and the front surface 116 of the casing 11, and a gap is provided between the supply-side end of the supply-side partition plate 52 c and the back surface 117 of the casing 11. The sludge is allowed to move. For the discharge side end, even if the sludge moves from one stirring and transporting mechanism 20 side to the other stirring and transporting mechanism 20 side, it does not greatly affect the drying of the sludge. Even if sludge moves from one agitating and conveying mechanism 20 side to the other agitating and conveying mechanism 20 side, the sludge has a high moisture content and high fluidity at this position. Because it becomes. In addition, you may employ | adopt the structure which does not provide a to-be-dried object movement restriction | limiting means in a discharge side end and a supply side end also in said embodiment and the other modification demonstrated below in this way.

  The height of each of the partition plates 52a to 52c is slightly higher than the height of the sludge that is stirred and transported by the stirring and transporting mechanism 20. In the present modification, the height of the partition plates 52 a to 52 c is higher than the highest position of the blade 212 provided on the shaft 211. Thereby, the sludge conveyed by the agitating and conveying mechanism 20 is prevented from leaking over the partition plates 52a to 52c to the adjacent agitating and conveying mechanism 20 side. In this modification, there are gaps between the partition plates 52a to 52c, between the partition plate 52a and the front surface 116 of the casing 11, and between the partition plate 52c and the back surface 117 of the casing 11, respectively. Since the communication between the space on the one stirring and conveying mechanism 20 side and the space on the other stirring and conveying mechanism 20 side can be ensured, the height of the partition plates 52a to 52c may reach the upper surface 121 of the casing 11, and the partition plate 52a. ˜52c may be fixed to the casing 11 at the bottom surface 120 and the top surface 121 of the casing 11.

  FIG. 8 is a diagram showing a second modification of the object to be dried movement restricting means. Also in FIG. 8, only the casing 11 and the to-be-dried object movement restriction | limiting means are shown typically, and illustration of the other structure is abbreviate | omitted. In the present modification, the object to be dried movement restricting means is a slit plate 53 having a large number of vertical slits. The slit plate 53 is divided into a large number of thin strip-shaped plates to form the slits. The slit plate 53 is rectangular and is fixed to the bottom surface 120 of the casing 11 at the bottom. The height of the slit plate 53 is slightly higher than the height of the sludge stirred and transported by the stirring transport mechanism 20. In the present modification, the height of the slit plate 53 is higher than the highest position of the blades 212 provided on the shaft 211. Thereby, the sludge conveyed by the agitating and conveying mechanism 20 is prevented from leaking over the slit plate 53 to the adjacent agitating and conveying mechanism 20 side.

  Also in this modified example, the slit plate 53 has a slit, which can ensure communication between the space on the one stirring and conveying mechanism 20 side and the space on the other stirring and conveying mechanism 20 side. May reach the top surface 121 of the casing 11, and the slit plate 53 may be fixed to the casing 11 at the bottom surface 120 and the top surface 121 of the casing 11.

  FIG. 9 is a diagram illustrating a third modification of the object movement restriction unit. Also in FIG. 9, only the casing 11 and the to-be-dried object movement restricting means are schematically shown, and the other configurations are not shown. In this modification, the to-be-dried object movement restricting means is a plurality of bars 54 erected vertically. A gap is secured between the bars of the plurality of bars 54. The plurality of bars 54 have the same height, are parallel to each other, and are provided along the raised portion of the bottom surface 120 of the intermediate casing 11 of the two agitating and conveying mechanisms 20. is there. The plurality of bars 54 are fixed to the bottom surface 120 of the casing 11. The height of the plurality of bars 54 is slightly higher than the height of the sludge stirred and transported by the stirring and transporting mechanism 20. In the present modification, the height of the plurality of bars 54 is higher than the highest position of the blades 212 provided on the shaft 211. Thereby, the sludge conveyed by the agitation conveyance mechanism 20 is prevented from leaking over the plurality of rods 54 to the adjacent agitation conveyance mechanism 20 side.

  In the present modification as well, there is a gap between the bars of the plurality of bars 54, thereby ensuring communication between the space on one stirring and conveying mechanism 20 side and the space on the other stirring and conveying mechanism 20 side. Therefore, the height of the plurality of bars 54 may reach the upper surface 121 of the casing 11, and the plurality of bars 54 may be fixed to the casing 11 at the bottom surface 120 and the upper surface 121 of the casing 11.

  FIG. 10 is a diagram showing a fourth modification of the object to be dried movement restricting means. Also in FIG. 10, only the casing 11 and the to-be-dried object movement restriction | limiting means are shown typically, and illustration of the other structure is abbreviate | omitted. In this modification, the to-be-dried object movement restriction means is a plurality of bars 55 provided in the horizontal direction. The bars in the plurality of bars 55 are in contact with each other. Each of the plurality of bars 54 extends from the front surface 116 to the back surface 117 of the casing 11 and is parallel to each other, and is stacked on the raised portion of the bottom surface 120 of the intermediate casing 11 between the two agitation transport mechanisms 20, and is generally rectangular. . The plurality of bars 55 are fixed to the front surface 116 and the back surface 117 of the casing 11. The height of the plurality of stacked bars 55 is slightly higher than the height of the sludge stirred and transported by the stirring and transporting mechanism 20. In the present modification, the height of the plurality of stacked bars 55 is higher than the highest position of the blades 212 provided on the shaft 211. Thereby, the sludge conveyed by the agitation conveyance mechanism 20 is prevented from leaking over the plurality of rods 55 to the adjacent agitation conveyance mechanism 20 side.

  FIG. 11 is a diagram showing a fifth modification of the object to be dried movement restricting means. Also in FIG. 11, only the casing 11 and the to-be-dried object movement restriction | limiting means are shown typically, and illustration of the other structure is abbreviate | omitted. In this modification, the object to be dried movement restricting means is a single movable partition plate 56 erected vertically. The movable partition plate 56 is provided along a portion where the bottom surface 120 of the casing 11 in the middle of the two agitation transport mechanisms 20 is raised. The movable partition plate 56 can move (slide) on a rail 561 provided along the raised portion of the bottom surface 120. In the example of FIG. 11, the movable partition plate 56 is located at the center portion in the sludge conveyance direction, and the movement of the sludge is limited only by this portion.

  Thus, in this modification, the movable partition plate 56 is installed in a part where the viscosity of the sludge is high and it is easy to move in the direction perpendicular to the conveying direction. For example, when the sludge is sewage sludge, the movable partition plate 56 is installed near the center between the front surface 116 and the rear surface 117 as shown in FIG. Thereby, the quantity of the movable partition plate 56 can be reduced and labor and cost can be reduced. In addition, it is possible to avoid friction and adhesion troubles in parts where the partition plate is unnecessary. In the first modification, each partition plate 52a to 52c may be movable along the sludge transport direction.

  FIG. 12 is a diagram showing a sixth modification of the object movement restriction unit. Also in FIG. 12, only the casing 11 and the to-be-dried object movement restriction | limiting means are shown typically, and illustration of the other structure is abbreviate | omitted. In this modification, the object movement restriction means is a plurality of strip-shaped plate members 57 suspended vertically. The plurality of plate members 57 can move (slide) a rail 571 provided on the upper surface 121 of the casing 11 along a portion where the bottom surface 120 of the middle casing 11 of the two stirring and conveying mechanisms 20 is raised. Each plate member of the plurality of plate members 57 is rectangular and has the same length. The plurality of plate members 57 extend from the upper surface 121 of the casing 11 to the height of the sludge that is stirred and transported by the stirring and transporting mechanism 20. In the present modification, the lower ends of the plurality of plate members 57 are set at a slightly higher position than the highest position of the blades 212 provided on the shaft 211.

  When the sludge is biased in the direction perpendicular to the sludge conveyance direction, the sludge is moved in the direction perpendicular to the sludge conveyance direction by moving the plurality of plate members 57 from a position where the sludge height level is high to a low position. Restrict. Thereby, when the sludge stirred and transported by the stirring and transporting mechanism 20 exceeds the normal height and moves toward the adjacent stirring and transporting mechanism 20, the plurality of plate members 57 suspended from the upper surface 121 of the casing 11. The movement is restricted and such movement is restricted. According to this modification, the movement of sludge can be limited with a simple and inexpensive structure.

  FIG. 13 is a view showing a seventh modification of the object to be dried movement restricting means. This modification is a modification to the partition plate 51 of the above embodiment. In the above embodiment, the bottom surface 120 of the casing 11 is curved along the shape of the agitation shaft 21, and the partition plate 51 is located between the agitation shafts 21 inside the agitation transport mechanisms 20. Although 120 is provided in the raised portion, in this modification, the bottom surface 120 ′ between the stirring and conveying mechanism 20 is flat.

  And partition plate 51 'has a shape which spreads in the right-and-left both sides so that the shape of the stirring shaft 21 of both sides may be followed by a bottom part. With this shape, the shape of the drying chamber can be made the same as in the above embodiment, and sludge accumulates in the bottom corner of the internal space (drying chamber) of the casing 11 as in the above embodiment. Can be prevented. And the partition plate 51 'of this modification is set as the structure heated from the inside similarly to the partition plate 51 of said embodiment. As a result, the sludge is heated in a larger area, and drying is promoted.

  Heretofore, various modifications of the object to be dried movement limiting unit with respect to the above-described embodiment have been described. The above-described embodiment can be variously modified with respect to other parts of the object to be dried movement restricting means. Hereinafter, modified examples will be described.

  Fig.14 (a) is a top view which shows the sludge drying apparatus of a modification, FIG.14 (b) is a side view corresponding to Fig.14 (a). In the above embodiment, two sludge supply ports 111 respectively corresponding to the two agitation transport mechanisms 20 are provided on the upper surface 121 of the casing 11, and each agitation transport mechanism 20 is provided with a corresponding sludge supply port 111. Sludge was introduced. In the present modification, the sludge drying apparatus 10 ′ includes one sludge supply port 111 ′ common to the two agitation transport mechanisms 20 on the upper surface 121. In the drying chamber below the sludge supply port 111 ′, a sludge storage portion 123 is formed by the supply weir 122 provided from the right side surface 118 to the left side surface 119. The sludge storage part 123 is not partitioned by the partition plate 51, and is thus formed from the right side surface 118 to the left side surface 119 corresponding to the two stirring and transporting mechanisms 20. Further, the shaft 211 of the agitation shaft 21 penetrates the supply weir 122 and vertically passes through the sludge storage portion 123, but the blade 212 is not provided in this portion. The upper end of the supply weir 122 is horizontal and has the same height from the right side surface 118 to the left side surface 119.

  By providing such a sludge storage part 123, the sludge supplied to the drying chamber from the sludge supply port 111 ′ is temporarily stored in the sludge storage part 123. As the amount of sludge stored in the sludge storage unit 123 increases and passes over the supply weir 122, the sludge is supplied to the stirring and conveying mechanism 20 having the blades 212. Since the just-supplied sludge contains a relatively large amount of water and has a low viscosity, the surface of the sludge stored in the sludge reservoir 123 is flat. Therefore, the amount of sludge exceeding the supply weir 122 is also from the right side surface 118. Equal amount over left side 119. That is, the amount of sludge supplied to the two agitation transport mechanisms 20 is equal despite the single sludge supply port 111 ′. In this respect, the drying conditions can be made equal in the two agitation transport mechanisms 20. Moreover, according to this modification, even when the sludge drying apparatus has a plurality of agitation transport mechanisms 20, it is not necessary to distribute the sludge to the agitation transport mechanisms 20 in equal amounts before supplying the sludge to the drying chamber. In addition, unevenness in dryness due to such uneven distribution can be avoided. The supply weir 122 is a means for moving the sludge supplied from the sludge supply port 111 ′ to the conveyance side while making it uniform in the parallel direction of the agitation conveyance mechanism 20, and the “supply adjustment means” of the present invention. It corresponds to.

  FIG. 15 (a) is a plan view showing a sludge drying apparatus of a further modification, FIG. 15 (b) is a side view corresponding to FIG. 15 (a), and FIG. 15 (c) is FIG. 15 (b). It is CC sectional drawing of). In the example of FIG. 14, a supply weir 122 having a horizontal top end is provided below the sludge supply port 111 ′ from the right side 118 to the left side 119, and rises from the bottom of the casing 2. The sludge storage part 123 was formed by storing the sludge supplied to the drying chamber from the sludge supply port 111 ′. In the example of FIG. 15, an adjustment plate 122 ′ is provided above the stirring shaft 21 instead of the supply weir 122.

  As shown in FIG. 15 (c), the adjustment plate 122 ′ is connected to an elevating mechanism (not shown) at the upper left and right ends, as with the discharge weir 31, and is pulled up or lowered by the elevating mechanism. The lower end of the adjustment plate 122 ′ has a shape in which a portion corresponding to the stirring shaft 21 is recessed on an arc so as to be along the surface of the stirring shaft 21.

  Further, in the example of FIG. 15, the blades 212 are provided on each stirring shaft 21 on the supply side of the adjustment plate 122 ′. Therefore, the sludge supplied to the drying chamber from the sludge supply port 111 ′ is conveyed to the discharge side by the rotating blades 212, but the movement to the discharge side is restricted by the adjustment plate 122 ′. It passes through the lower end of ′ (passes between the lower end of the adjusting plate 122 ′ and the bottom of the casing 2) and is conveyed to the discharge side.

  The height of the lower end of the adjustment plate 122 ′, that is, the distance between the lower end of the adjustment plate 122 ′ and the bottom of the casing 2 is uniform in the direction perpendicular to the conveyance direction, that is, the direction in which the plurality of agitation conveyance mechanisms 20 are arranged. It is. Thereby, about the some stirring conveyance mechanism 20, the quantity of the sludge conveyed below the adjustment board 122 'and being discharged to the discharge side can be equalize | homogenized. The amount of sludge supplied to the discharge side is adjusted by adjusting the height of the adjustment plate 122 ′. The adjustment plate 122 ′ is a means for moving the sludge supplied from the sludge supply port 111 ′ to the conveyance side while being uniform in the parallel direction of the agitation conveyance mechanism 20, and corresponds to the “supply adjustment means” of the present invention. To do.

  The partition plate 51 reaches the discharge side surface of the adjustment plate 122 ′. As a result, the sludge that has passed under the adjusting plate 122 ′ is restricted by the partition plate 51 from moving to the adjacent stirring and conveying mechanism 20.

  According to the example of FIG. 15, the sludge supplied to the sludge storage part 123 from the sludge supply port 111 ′ is contained in the sludge storage part 123 as compared with the case where the supply weir 122 is erected at the bottom of the casing 2. There is no stagnation at the rising portion of the supply weir 122. That is, the sludge whose movement to the discharge side is restricted by the adjustment plate 122 ′ is moved downward by its own weight and the weight of sludge newly supplied from above, so that the adjustment plate 122 ′ and the casing 2 It will be conveyed to the discharge side through the bottom. Therefore, in the example of FIG. 15, there is no portion where sludge stays on the supply side.

  In the above embodiment, the sludge drying apparatus 10 having the two agitation transport mechanisms 20 has been described. However, the number of the agitation transport mechanisms 20 may be three or more. In the above-described embodiment, the stirring and conveying mechanism 20 is configured with two stirring shafts 21 as a set. However, even if one stirring and conveying mechanism 20 is configured by one or three stirring shafts 21. Good.

  Further, the stirring shaft is not limited to that in the above embodiment. In particular, the blade fixed to the shaft is not limited to the shape of the above-described embodiment as long as it can convey the sludge while stirring. 16 is a view showing a modification of the stirring shaft, and is a cross-sectional view taken along the line AA of FIG. The stirring shaft 21 of this modification has four blades 212 fixed at equal intervals in the circumferential direction of the shaft 211. The blade | wing 211 consists of the board used as the braid | blade attached to the tubular thing connected to the shaft 211, and the front-end | tip of a cyclic | annular thing.

DESCRIPTION OF SYMBOLS 100 Sludge drying system 10 Sludge drying apparatus 11 Casing 111 Sludge supply port 112 Circulation air discharge port 113 Circulation air supply port 114 Dry sludge discharge port 115 Casing cover 116 Front surface 117 Rear surface 118 Right surface 119 Left side surface 120 Bottom surface 121 Upper surface 12 Bearing 122 Supply Weir 122 ′ Adjusting plate 123 Sludge reservoir 13 Drive mechanism 136 Gear case 20 Stirring transport mechanism 21 Stirring shaft 211 Shaft 212 Blade 213 Steam supply port 214 Steam discharge port 30 Discharge adjustment mechanism 31 Discharge weir 32 Lifting mechanism 51 Partition plate 511 Windows 52a to 52c Partition plate 53 Slit plate 54 Multiple rods 55 Multiple rods 56 Movable partition plate 57 Multiple plate members 81 Cyclone 82 Dehumidification tower 83 Dehumidification tower circulation pump 84 Circulation fan 85 Mist separator 8 Preheater 911-915 circulation pipe 916 exhaust pipe 921, 922 water circulation passage 923 wet tower down the drain pipe 926 wet down steam pipe 924 steam drain pipe 925 tower water supply pipe 927 a vapor drain pipe

Claims (13)

A drying device that dries the material to be dried while stirring and transporting,
A plurality of stirring and conveying mechanisms for stirring and conveying the material to be dried by rotating the stirring shaft;
A to-be-dried object movement restricting means for restricting movement of the to-be-dried object from one agitating and conveying mechanism to another adjacent agitating and conveying mechanism provided between the plurality of agitating and conveying mechanisms;
A drying apparatus comprising:   The drying apparatus according to claim 1, wherein a space including one agitation transport mechanism communicates with a space including another adjacent agitation transport mechanism.   The drying apparatus according to claim 1, wherein the drying object movement restriction unit allows the movement of the drying object at a supply side end of the drying object.   The drying apparatus according to any one of claims 1 to 3, wherein the drying object movement restricting means is movable in a conveying direction of the drying object by the stirring and conveying mechanism.   The drying apparatus according to claim 1, further comprising a heating unit that heats the dry matter movement restriction unit.   2. The apparatus according to claim 1, further comprising a control device that individually controls the drying conditions of each of the plurality of stirring and transporting mechanisms based on a moisture content of the material to be dried dried by the stirring and transporting mechanism. The drying device according to any one of 5.   The drying apparatus according to any one of claims 1 to 6, wherein the object to be dried conveyed by the agitation conveyance mechanism is discharged in a conveyance direction of the object to be dried by the agitation conveyance mechanism. An object receiver is provided under the stirring and conveying mechanism,
The drying apparatus according to any one of claims 1 to 7, wherein a discharge weir that rises from the object to be dried is provided on a discharge side of the stirring and conveying mechanism.   The drying apparatus according to claim 8, wherein the discharge weir can be independently adjusted in height for each of the plurality of stirring and conveying mechanisms.   2. A supply adjusting means is provided for moving the material to be dried supplied into the drying apparatus to the discharge side of the stirring and conveying mechanism while uniforming in the parallel direction of the stirring and conveying mechanism. The drying apparatus as described in any one of thru | or 9. In addition to storing the material to be dried supplied in the drying apparatus, the storage device further includes a storage unit having a supply weir as the supply adjustment means whose upper end is horizontal,
The drying apparatus according to claim 10, wherein the object to be dried is supplied to the plurality of agitation transport mechanisms over the upper end of the supply weir. The supply adjusting means is an adjusting plate provided above the stirring and conveying mechanism,
The drying apparatus according to claim 10, wherein the material to be dried supplied into the drying apparatus is transported to a discharge side of the agitation transport mechanism through the adjustment plate. A drying apparatus according to any one of claims 1 to 12,
A to-be-dried object supply mechanism for supplying an object to be dried to the drying device;
A to-be-dried material discharge mechanism for discharging the to-be-dried material dried from the drying device;
A drying system comprising: