JP2000018823A - Drier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drier which can perform the supply of additive to be added to substance to be dried stably, without constitution becoming complicated or without incurring the cost up or without taking time, in a drier which adds an additive when drying goods. SOLUTION: In the condition that a discharge screw 26 rotating in the direction of not discharging a substance W to be dried from a dry substance discharge port 22 during drying of the substance W to be dried and rotating reversely when the drying is finished so as to discharge a dry substance Wa from a drying room 6 is rotating in the reverse direction to the direction of discharging the substance W to be dried, an additive T is supplied from an additive supply port 29 made at a dry substance discharge pipe 25. This additive T is sent in the drying room 6 by the carry force of the discharge screw 26 stored in the dry substance discharge port 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drying apparatus for drying sewage sludge and dewatered sludge formed by dewatering organic sludge generated in food production, and more particularly to a structure for supplying additives to be dried. To a drying device with improved properties.

[0002]

2. Description of the Related Art In recent years, sewage sludge and organic sludge generated in food production have been put to practical use not only for disposal but also for dehydration and effective use for compost.
However, the residual moisture of the sludge after dewatering is generally 60
８０80% WB (wet weight basis). When this is effectively used for compost or the like, it is necessary to dry it to a water content of 30% WB or less with a drying device so as to be suitable for storage and spraying.

Conventionally, as a drying apparatus used for this type of drying, a stirring blade is provided in a drying chamber having an inner peripheral surface serving as a heat transfer surface, and the object to be dried in the drying chamber is scraped by the rotation of the stirring blade. While drying the object to be dried by repeatedly contacting the object to be dried with the heat transfer surface, and by adding an additive to the object to be dried, the drying efficiency is improved or deodorized. A known drying device is known.

In this type of drying apparatus, the conventional additive supply structure has been as follows. That is, an additive inlet is provided in the middle of a pipe of a screw conveyor for transporting the material to be dried to supply the material to be dried into the drying chamber, and the additive is charged into the additive inlet so that the additive is added to the drying chamber. What led to. In addition, an additive supply port that faces the drying chamber is formed in the main body of the drying apparatus, and a dedicated additive feeder for feeding the additive is provided to the additive supply port, and the additive is supplied to the drying chamber. It is intended to be supplied to.

[0005] However, in the former case in which the additive inlet is provided in the middle of the pipe of the screw conveyor for transporting the object to be dried, if the object to be dried contains moisture and sticky sludge, the additive inlet is dried. There is a possibility that the material may be blocked by the object and a predetermined amount of the additive may not be supplied.

[0006] Therefore, in order to perform stable supply, the cleaning operation of the additive inlet must be periodically performed in a short cycle, which is one of the factors that hinders the improvement of the operation efficiency. Further, there is a problem that not only the burden on the worker increases, but also management is required to prevent the occurrence of a malfunction due to forgetting to clean.

[0007] Further, in the latter type, in which an additive supply port is provided in the main body of the drying apparatus and the additive is supplied into the drying chamber through a dedicated additive feeding apparatus, the cleaning operation is performed in a short cycle as in the former. It does not need to be performed on a regular basis, and has the advantages of improving operation efficiency, reducing the burden on workers and reducing the time and effort required for management compared to the former. It has to be provided or a dedicated additive feeding device has to be added, which requires a lot of trouble in the manufacturing operation, and has a problem that the configuration becomes complicated and the cost increases.

[0008]

As described above, in a conventional drying apparatus having an additive adding function, a cleaning operation of an additive inlet to which a screw conveyor for transporting a material to be dried is connected is performed in a short cycle. Or by providing an additive supply port in the drying unit and a special additive feeder, so that a fixed amount of additive is supplied. However, there are problems such as the cost and complexity of the structure and the increase in cost.

The present invention has been made based on the above circumstances, and an object of the present invention is to provide a drying apparatus having an additive adding function without complicating the structure or increasing the cost. It is an object of the present invention to provide a drying apparatus capable of stably supplying an additive to be dried, without causing the drying.

[0010]

According to the present invention, as a first means for achieving the above object, a stirring blade is provided in a drying chamber having an inner surface serving as a heat transfer surface, and the drying chamber is rotated by rotating the stirring blade. The object to be dried is scraped up, and the object to be dried is dried by repeatedly bringing the object to be dried into contact with the heat transfer surface. In the drying device to be added, the additive supply means is also used as a dry matter discharge means for discharging a dry matter from the drying chamber.

As described above, since the additive supply means is also used as a dry substance discharge means for discharging the dry substance from the drying chamber, the additive supply port is provided in the drying apparatus main body and a dedicated additive supply apparatus is provided. It is possible to stably supply the additive without adding the slab, and it is possible to avoid the trouble of the manufacturing operation, the complicated structure, and the high cost unlike the conventional case. In addition, the additive input portion does not become blocked by the material to be dried, so that the cleaning work for this can be made unnecessary.

The second means includes a drying apparatus main body having a drying chamber having an inner surface serving as a heat transfer surface and having a dried material discharge port for discharging the dried substance from the drying chamber. A stirring blade, which is provided in the drying chamber, and rotatably picks up an object to be dried in the drying chamber with rotation and makes contact with the heat transfer surface repeatedly, and is provided in a state of communicating with the dry matter discharge port; A dry matter discharge pipe for guiding the dry matter discharged from the chamber to a discharge destination, and a direction in which the dry matter is discharged from the dry matter discharge port provided in the dry matter discharge pipe while the dry matter is being dried. Rotate in the opposite direction, rotate in the direction of discharging after drying is completed, and correspond to the discharge screw for discharging the dried product from the drying chamber, and the position of the discharge screw of the dried product discharge pipe. And an additive supply port provided By supplying the additive from the additive supply port in a state where the discharge screw is rotating in a direction opposite to the direction in which the material to be dried is discharged, the additive is transported by the discharge screw. It is designed to be sent into a drying room.

[0013] As described above, the additive supplied from the additive supply port formed in the dry matter discharge pipe can be sent into the drying chamber by the discharge screw housed inside the dry matter discharge pipe. An additive supply port is provided in the main body of the drying device, and the supply of additives can be performed stably without the need for a dedicated additive feeding device. And no cost increase. In addition, the additive input portion does not become blocked by the material to be dried, so that the cleaning work for this can be made unnecessary.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a state in which additives are added during drying, and FIG. 2 shows a state in which dried substances are discharged.

In FIG. 1, reference numeral 1 denotes a drying device main body, and the drying device main body 1 has a steam passage 4 for passing steam S as a heat source between an inner cylinder 2 and an outer cylinder 3 arranged concentrically. It has a jacket structure, and has a cylindrical drying chamber 6 in which an inner peripheral surface is a heat transfer surface 5.

A steam supply pipe 7 is attached to the upper portion of the cylindrical portion of the drying apparatus main body 1, and a steam discharge pipe 8 is attached to the lower portion of the cylindrical portion and opposite to the position where the steam supply pipe 7 is attached. And are in communication with the steam passage 4 respectively.

The heat transfer surface 5 of the drying chamber 6 is heated by the steam S supplied from the steam supply pipe 7 at the jacket inlet and discharged from the steam discharge pipe 8 at the jacket outlet. .

In the drying chamber 6 having an inner peripheral surface serving as a heat transfer surface 5, a dewatered sludge W (hereinafter, referred to as a dried material) serving as a compost material is repeatedly brought into contact with the heat transfer surface 5. Is provided with a spiral stirring blade 10 for stirring.

The stirring blade 10 is rotatable by a motor 12 as a driving source attached to a bottom plate 11 of the drying device main body 1 and a support device 14 attached to a lid 13 for closing the upper surface of the drying device main body 1. , And are supported so as to be concentric with the cylindrical heat transfer surface 5.

The stirring blades 10 are formed by winding a rotating shaft 10a whose upper and lower ends are supported by a driving shaft 12a of the motor 12 and a supporting device 14, and a band plate member wound around the rotating shaft 10a. And a plurality of rod-shaped support members 10c for fixing the blade body 10b to the rotating shaft 10a.

With the rotation of the motor 12 in the direction of the arrow a, the object W supplied into the drying chamber 6 is scraped up by the blade body 10b, and the object W passing through the end of the blade body 10b. Is the rotating shaft 10a and the blade body 10b
Through the gap G with the inner diameter of the drying chamber 6.

A lid 13 attached to the upper portion of the main body 1 of the drying apparatus has a drying object supply port 20 for supplying a drying object W connected to a pipe of a screw conveyor (not shown) for conveying the drying object. In addition, an evaporated water exhaust port 21 for exhausting the evaporated water is formed.

Further, a dried material W having a predetermined residual moisture, ie, a dried material (compost or the like in this embodiment) Wa, which has been dried, is disposed below the cylindrical portion of the drying device body 1. An object outlet 22 is formed.

The dried product outlet 22 is provided with the drying chamber 6.
And a dry matter discharge pipe 25 for guiding the dry matter Wa discharged from the drying object to the discharge destination, and the dry matter discharge port 25 is provided in the dry matter discharge pipe 25 so that the dry matter W is discharged while the dry matter W is being dried. 22
A screw conveyor 27 comprising a discharge screw 26 which rotates in the direction opposite to the direction of discharging from the drying chamber (the direction of the solid arrow b) and reverses in a state where drying is completed and discharges the dried material Wa from the drying chamber 6 is connected. And dry matter discharging means 2
8.

Further, an additive supply port 29 is provided on the upper surface side of the dry matter discharge pipe 25 and at a position close to the dry matter discharge port 22, and an additive supply guide pipe is provided in the additive supply port 29. 30 are connected. Then, the additive T supplied through the additive supply guide tube 30 is used for drying the object W to be dried.
Screw 2 rotating in a direction (solid arrow b direction) opposite to the direction in which is discharged from the dry matter discharge port 22.
6, and is conveyed to the drying chamber 6 side by the discharge screw 26, and constitutes an additive supply means 31.

The additive supply means 31 utilizes the screw conveyor 27, and is configured to also serve as the dry matter discharge means 28. The degree of drying of the object to be dried W in the drying chamber 6 is determined by a temperature measurement sensor (not shown).
Is to be detected.

Next, the operation of the thus-configured drying apparatus of the present invention will be described. First, the drying operation will be described with reference to FIG. The drying object W supplied from the drying object supply port 20 via the drying object conveying screw conveyor (not shown) is applied to the cylindrical heat transfer surface 5 while receiving centrifugal force by the stirring blade 10 rotating in the direction of arrow a. Along with the rotating shaft 10a and the blade body 10b.
Of the drying chamber 6 from the gap G with the inner diameter of the drying chamber 6.

During this drying operation, the discharge screw 26 of the screw conveyor 27 connected to the dry material discharge port 22
It rotates in the direction of the solid line arrow b, and is the direction opposite to the direction in which the object to be dried W is discharged from the dried material discharge port 22, that is, the direction in which the object to be dried W is returned into the drying chamber 6 (the direction of the solid arrow b). ) Is rotating.

On the other hand, at the same time as the material to be dried W is charged into the drying chamber 6, an additive T is charged from the additive charging guide tube 30, and the additive T is supplied to the discharge screw 26 by a solid arrow b.
The sheet is conveyed in the direction of arrow c with the rotation in the direction and is sent into the drying chamber 6. Then, similarly to the material to be dried W, the stirring blade 10 is lifted up along the cylindrical heat transfer surface 5 while receiving centrifugal force, and thereafter, the rotating shaft 10a and the blade main body 10b
Of the drying chamber 6 from the gap G with the inner diameter of the drying chamber 6.

By repeating this operation, the additive T
Is stirred and mixed with the object to be dried W, and the object to be dried W is dried by heat exchange with the cylindrical heat transfer surface 5. And
When it is confirmed from the detection information from the temperature measurement sensor (not shown) that the drying has been completed, as shown in FIG.
The direction in which the discharge screw 26 reverses and discharges (dashed arrow d
Direction), and the dried material Wa is conveyed in the direction of arrow e and carried out to the discharge destination.

As described above, since the additive supply means 31 is also used as the dry substance discharge means 28 for discharging the dry substance Wa from the drying chamber 6, the additive supply port is connected to the drying apparatus main body 1 as in the prior art. The additive T can be supplied stably without the use of a dedicated additive feeding device, and the production work is troublesome, the configuration is complicated, and the cost is high as in the conventional case. There is no. In addition, the additive supply port 29, which is the additive input portion, does not become blocked by the material to be dried W, and the cleaning work for this can be made unnecessary. The present invention is not limited to the above-described embodiment, but can be variously modified without departing from the spirit of the present invention.

[0032]

As described above, according to the present invention, the following effects can be obtained. According to the drying device of the first aspect, a stirring blade is provided in a drying chamber having an inner surface serving as a heat transfer surface, and the object to be dried in the drying chamber is scraped up by rotation of the stirring blade.
In the drying apparatus, the object to be dried is dried by repeatedly contacting the object to be dried with the heat transfer surface, and an additive is supplied from an additive supply means during the drying to be added to the object to be dried. , The additive supply means,
Since it also serves as a dry matter discharging means for discharging dry matter from the drying chamber, the supply of additives is stable even if an additive supply port is provided in the drying device main body and a dedicated additive feeding device is not attached. It does not require a lot of trouble in the manufacturing operation, complicates the configuration, or raises the cost as in the related art. Further, there is an effect that the additive input portion is not blocked by the matter to be dried, and the cleaning work for this can be made unnecessary.

According to the drying device of the second aspect, the additive supplied from the additive supply port formed in the dried product discharge pipe is introduced into the drying chamber by the discharge screw housed inside the dried product discharge pipe. In this way, it is possible to supply additives stably without providing an additive supply port in the drying device main body and attaching a dedicated additive supply device. No cost, no complicated structure, and no cost increase. Further, there is an effect that the additive input portion is not blocked by the matter to be dried, and the cleaning work for this can be made unnecessary.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view schematically showing an example of an embodiment of the present invention and showing an additive supply operation state during drying.

FIG. 2 is a longitudinal sectional view showing a state when a dried product is discharged.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Drying apparatus main body 5 ... Heat transfer surface 6 ... Drying room 10 ... Stirring blade 22 ... Dry matter discharge port 25 ... Dry matter discharge pipe 26 ... Discharge screw 27 ... Screw conveyor 28 ... Dry matter discharge means 29 ... Additive supply port 31 ... Additive supply means W ... Dried object Wa ... Dried object T ... Additive

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yutaka Hasegawa 2068-3 Ooka, Numazu-shi, Shizuoka Toshiba Machine Co., Ltd. Numazu Office (72) Inventor Yoshiyoshi Katsuta 2068-3 Ooka, Numazu-shi, Shizuoka Toshiba Machine Numazu In-house (72) Inventor Hiroaki Kusanagi 2068-3 Ooka, Numazu City, Shizuoka Prefecture F-term in Toshiba Machine Techno Co., Ltd. 3L113 AA09 AB05 AB08 AC15 AC40 AC45 AC46 AC54 AC58 AC61 AC63 AC75 AC76 BA37 CA04 DA04 DA05 DA06 DA07 DA13 4D059 AA03 AA07 AA08 BD11 BD24 BE00 BJ02 BK30 CA01 CB06 CB09 CB12 CC01 EA06

Claims (2)

[Claims] An agitating blade is provided in a drying chamber having an inner surface serving as a heat transfer surface, and an object to be dried in the drying chamber is scraped up by rotation of the agitating blade, and the object to be dried is repeatedly brought into contact with the heat transfer surface. By drying the object to be dried by doing,
In a drying apparatus which supplies an additive from the additive supply means during the drying and adds the additive to the material to be dried, the additive supply means includes a dry substance discharge means for discharging the dry substance from the drying chamber. A drying device, which is also used. 2. A drying apparatus main body having a drying chamber having an inner surface serving as a heat transfer surface, and having a drying material discharge port for discharging a drying substance from the drying chamber, and provided in the drying chamber of the drying apparatus main body. An agitating blade that lifts the material to be dried in the drying chamber with rotation and repeatedly contacts the heat transfer surface; and a drying blade that is provided in communication with the drying material discharge port and is discharged from the drying chamber. A dry matter discharge pipe for guiding the matter to a discharge destination; provided in the dry matter discharge pipe, while the matter to be dried is being dried, rotated in a direction opposite to a direction in which the matter to be dried is discharged from the dry matter discharge port. A discharge screw that rotates in a direction in which the drying is completed and discharges the dried product from the drying chamber; and an additive provided corresponding to a position of the discharge screw in the dried product discharge pipe. A supply port; By supplying the additive from the additive supply port in a state where the screw is rotating in the direction opposite to the direction in which the object to be dried is discharged, the additive is sent into the drying chamber by the conveying force of the discharge screw. A drying device characterized in that: