KR20170068026A

KR20170068026A - Disk dryer for organic sludge

Info

Publication number: KR20170068026A
Application number: KR1020150174715A
Authority: KR
Inventors: 이병삼; 지영지
Original assignee: 주식회사 네오디아
Priority date: 2015-12-09
Filing date: 2015-12-09
Publication date: 2017-06-19
Also published as: KR101750034B1

Abstract

In the present invention, organic sludge material including food waste, sewage sludge, industrial sludge, and the like is dried in a process of transferring the organic sludge material to a multi-stage disk, wherein a central axis for rotating the disks is formed into a quadrangle, To a disk dryer for organic sludge in which the scale formation between the disks is reduced and the sludge is prevented from sagging.
To this end, the present invention is characterized in that a hollow central shaft is rotatably disposed inside a cylindrical body, and a plurality of discs are provided on the central shaft to transfer the sludge in one direction, Wherein the center shaft has a rectangular cross section, and the center shaft has a rectangular cross section; The discs are welded to each other with two discs sloping in a diagonal direction from the center and welded at their ends. A rectangular hole is formed in the center of the disc to fit the center shaft, and a heating space communicating with the steam hole Feature.

Description

[0001] The present invention relates to a disk dryer for organic sludge,

The present invention relates to a disk dryer for organic sludge, and more particularly, to a disk dryer for organic sludge, more particularly, to a disk dryer for organic sludge, and more particularly to a disk dryer for organic sludge, The scale formation between the discs is reduced and the sludge accumulation phenomenon is prevented by changing the circumferential rate and the linear velocity of the shaft. Especially, by making the inside of the dryer airtight and discharging the steam with the vacuum pump, To a disk dryer for organic sludge in which the amount of steam and odor are reduced.

Globally, food waste, sewage sludge, industrial sludge, and so on are increasing with time, and the increase in the amount of these substances has a big influence on polluting the environment of the earth.

Therefore, in order to protect the environment and environment-friendly policies, many organizations including the government and local governments as well as environmental organizations are enlightening them in order to reduce the amount of waste generated. Inevitably, We are making efforts to minimize the impact on the environment as much as possible.

One of these efforts is to dry the food or sewage sludge containing water in the collection process to the water level below the appropriate level, and then to carry out the following treatment process.

A drying apparatus having such a function can be known from Korean Patent Publication No. 10-369435. Also, the drying process of the conventional organic sludge material can be known in detail through the Korean Utility Model Registration Bulletin (No. 20-240223) registered according to the cause.

The disk dryer disclosed in the aforementioned Korean Patent Publication includes a tubular jacket having a predetermined volume, a shaft disposed in the longitudinal direction of the jacket and having one end connected to the driving source so as to be rotatably operated, A plurality of discs arranged at predetermined intervals in the middle of an axis of the jacket, an attachment preventing metal fitting fixedly mounted on the inner circumferential edge of the jacket so as not to adhere to the inner wall of the jacket, And a scraper for controlling the conveyance of the laundry to be dried.

However, in the conventional disk dryers, in order to increase the drying efficiency and the transport efficiency of the objects to be dried, the interval between the disks is gradually increased as the distance between the disks is increased from the front to the rear, and the angle of the scrubber attached to the outer periphery of the disk progresses from front to back The drying efficiency and the conveying efficiency are increased to some extent, but the efficiency of the dryer can not be increased as much as desired by the operators using the dryer.

In addition, since the central axis for rotating the disk is formed in a circular shape, there is a problem in that the auxiliary bracket must be doubly fastened in order to increase the coupling force with the disk. Also, since the circumferential velocity of the circular axis is constant, Thereby causing the phenomenon that the sludge is accumulated between the disk and the disk.

Also, in the conventional disk dryer, the moisture evaporated by the heat source supply of the disk is discharged to an external fan to evaporate the moisture inside the dryer. The operation method of the dryer is a continuous type, not a batch type, so that the input and discharge are continuously performed. In order to operate the dryer, the inlet and outlet are always open. Therefore, it is necessary to exhaust the evaporated steam from the dryer to the outside, so that the drying device always needs to be provided at the downstream end of the dryer.

Since the discharge device and the discharge port are always open, the discharge device requires a large amount of outside air because the amount of vapor to be evaporated inside and the amount of air that can be moved to the outside before the steam is re-condensed are required. In addition, the discharged steam passes through the condenser and is mostly condensed and converted into condensed water. However, since the remaining non-condensable gas or the air introduced from the outside contains odor, it is deodorized in the deodorization tower or deodorization furnace and discharged to the atmosphere.

Therefore, in the conventional discharge apparatus, a large-capacity fan must be provided in order to introduce a large amount of outside air, and odor is contained in the discharged air. Therefore, there is a problem that a facility for removing odor is additionally required. There is a problem that a large amount of odor is contained in the air discharged in proportion to the amount of the exhaust gas.

DISCLOSURE Technical Problem The present invention has been made in view of the conventional problems, and it is an object of the present invention to provide a method of drying organic sludge material including food waste, sewage sludge and industrial sludge, The present invention provides a disc dryer for an organic sludge in which the center axis is formed as a quadrangle to change the circumferential rate and the linear velocity of the shaft to reduce scale formation between the discs and prevent the sludge from being accumulated.

It is another object of the present invention to provide an air conditioner in which the inlet and the outlet are composed of a closed-type dosing pump and a closed discharge device to keep the inside of the dryer in a closed state, and the steam outlet is connected with a vacuum pump to discharge the steam, The present invention also provides a disc dryer for an organic sludge in which the amount of a malodorous substance discharged due to a decrease in the amount of steam is significantly reduced and the drying speed is improved by vacuum inside the dryer.

To this end, the body of the present invention is formed in a cylindrical shape, and a steam jacket for covering the body is provided. And a vapor dome is formed on the upper side. A plurality of conveying members for conveying the contents and a rotating central shaft composed of a plurality of discs are attached. At the upper part of the body, there is an inlet for inputting the product and a steam outlet for discharging the steam, and an outlet for discharging the dried product to the side of the body. The jacket is equipped with a steam supply that supplies steam for drying and a drain that drains the condensate.

A scraper and a scraper stator are attached to the upper part of the body to remove discoloration between the disc and the disc and increase the heat transfer efficiency of the disc. A plurality of disk-shaped disks are attached to the central shaft, and a transfer plate is attached to the end of the disk to prevent the transfer of the product and the aggregation of the dried product due to the rotational direction of the disk. The center shaft is made up of square pipe and both ends have holes for supply of steam and discharge of condensate respectively and connected to rotary joint to supply the heat required for drying into each disk and discharge condensate.

Each disk is structured to secure a certain space between two disks. The central part of the disk is connected to the central axis by a square hole like the shape of the central axis, and steam is supplied to the space of the connection part. The inside of the body is completely shielded from the outside so as to maintain a vacuum, and the inlet and outlet are always kept in a sealed state with the product to be introduced and the product to be discharged. The input port is introduced by the piston pump which is the input device, so that the input pipe is always sealed with the product, and the outlet is maintained by the compressed transfer device attached to the discharge port, and maintains the vacuum inside.

The steam outlet consists of a condenser, a condensate tank and a vacuum pump, which keeps the inside of the dryer in a vacuum at all times. The discharge port is formed of a compression type screw, and the discharge portion of the screw is always kept in a compressed state by controlling the amount of transfer and volume of the screw inlet portion and the discharge portion, and the torque of the rotating body is controlled to maintain the compression state of the discharge port.

In the dryer of the embodiment of the present invention, the inlet is forced to be press-fitted by the piston pump so that the inlet is always kept in the closed condition and the continuous operation This is possible. In addition, the extrusion type transfer device attached to the discharge port is attached to maintain the sealed condition at all times.

In addition, since the inlet and outlet are kept in an airtight condition and continuous operation is possible, a vacuum pump, not a fan, is attached to the rear end of the dryer to discharge the steam inside the dryer. When the vacuum pump is attached, the steam evaporated in the dryer can be discharged to the outside of the dryer without the inflow of outside air. Therefore, when the outside air is not introduced, the amount of the discharged steam is significantly reduced, and the amount of the odor discharged is significantly reduced. When the drying is maintained by keeping the vacuum, the drying speed is improved and the dryer efficiency is increased.

According to an embodiment of the present invention, the central axis is a square, and when the disk rotates, the circumferential rate and the linear velocity of the axis are changed, and the rotation rate of the product between the disk and the disk is reduced. The inner side of the disk is rectangular, And the linear velocity is changed, so that the formation of scale on the outer wall of the disk is lowered and the drying efficiency is increased.

In addition, since the inside of the drying chamber is formed into a vacuum by making the inlet and the outlet closed, and the steam outlet is connected to the steam outlet by a vacuum pump, the steam that is evaporated can be discharged without influx of external air, The drying speed and the efficiency are increased.

1 is a conceptual diagram of a dryer of an embodiment of the present invention
2 is a perspective view of a disk of the dryer of the embodiment of the present invention.
3 is a side cross-sectional view of the dryer of the embodiment of the present invention

1 to 3, the dryer of the embodiment of the present invention is provided with a cylindrical body 10. On the outer circumferential surface of the body 10, a jacket 15 to which steam is supplied is provided so as to surround the body 10. The center shaft 20 is rotatably supported on both sides of the body 10 by a rotary joint.

The body 10 is provided with an inlet 11 for supplying sludge to one side of the upper part and an outlet 12 for discharging the dried sludge to the opposite side of the lower part. The charging port 11 is connected to the closing type pump 11a and the discharging port 12 is connected to the closed type discharger 12a to keep the inside of the body 10 in a vacuum state. The hermetically sealed dosing pump 11a is constituted by a piston type or a screw type so that the inside of the dosing pump 11a is always kept in an airtight state by the compressed sludge. The closed type ejector 12a is also constructed by a screw type, and the inside of the ejector 12a is kept in a closed state by the compressed sludge.

The upper portion of the body 10 is provided with a steam outlet 13 for discharging the steam generated during the drying process and the steam outlet 13 is connected to the vacuum pump 13a, To remain in a vacuum.

The central shaft 20 is provided with a rectangular hollow section and is supplied with steam. The steam supply port 21 is provided on one side of the central shaft 20 and the drain 22 . A plurality of discs 30 are provided on the central shaft 20 in a multi-stage manner.

The disk 30 has a double circular disk shape. The disk 30 has a square hole 31 welded to the center shaft 20 at a center thereof. The disk 30 has a heating space portion 32 filled with steam, And the heating space portion 32 corresponds to a plurality of steam holes 23 formed in the center shaft 20. [ A plurality of transfer blades 33 are provided on the outer circumferential surfaces of the disks 30 to transfer the sludge to the discharge port 12. In addition, a scraper (14) placed between the disks (30) is provided inside the body (10) to scrape off the sludge accumulated in the disks (30).

The dryer of the embodiment of the present invention configured as described above is provided with a cylindrical body 10 and a central shaft 20 having a plurality of discs 30 inside the body 10. The center shaft 20 is formed in a hollow shape having a rectangular cross section, and the disks 30 are inserted into the center shaft 20 while being inserted into the center shaft 20 through a rectangular hole. At this time, the interface between the center of the disk 30 and the central axis 20 is combined and integrated by means of welding or the like.

Since the center shaft 20 is formed in a rectangular shape, the disk 30 is prevented from being idle while the center shaft 20 is rotated. Therefore, it is not necessary to additionally provide a separate bracket to increase the coupling force between the disc 30 and the center shaft 20, which is convenient to manufacture. Also, since the central axis 20 is a quadrangle, a change occurs in the linear velocity in the circumferential direction. Therefore, the sludge sticking to the surface of the central shaft 20 is prevented.

Since the center of the disk 30 is also punctured into a square and is coupled with the central axis 20, the linear velocity in the circumferential direction is changed, so that the gap between the disk 30 and the disk 30 is filled with sludge, Is reduced.

In the dryer of the embodiment of the present invention, the inside of the body 10 is operated in a vacuum state. The inlet 11 into which the sludge is introduced is connected to the hermetically-closed dosing pump 11a to block the inflow of outside air. Also, the discharge port 12 is connected to the closed discharge unit 12a to block the inflow of outside air, and the steam discharge port 13 is also connected to the vacuum pump 13a. Therefore, the inside of the body 10 is evaporated while the inflow of outside air is blocked. The steam generated at this time is exhausted to the condenser and the deodorization tower via the vacuum pump 13a. In this process, the condensed water contained in the steam is removed, and the odor is removed.

In the embodiment of the present invention, since the inflow of outside air into the dryer is blocked, the amount of steam discharged is reduced. Therefore, there is an advantage that the size of the condenser and the deodorization tower for treating the discharged steam can be reduced.

10: Body 11:
11a: sealed pump 12: outlet
12a: Closed ejector 13: Steam outlet
13a: Vacuum pump 14: Scraper
15: jacket 20: center axis
21: steam supply port 22: drain
23: steam hole 30: disk
31: square hole 32: heating space part

Claims

A hollow central shaft is rotatably disposed inside the cylindrical body and a plurality of discs are provided in the central shaft to transfer the sludge in one direction and steam supplied through the center shaft flows into the respective disks, And drying the sludge,
The body is provided with an inlet for supplying sludge to one side of the upper portion and an outlet for discharging the dried sludge to the opposite side of the lower portion. The inlet and the outlet are connected to each other through a closed type injection pump and a closed type discharger, Being;
Wherein the steam outlet is connected to a vacuum pump to evacuate the inside of the sealed body and to discharge the steam without introducing outside air, Disc dryers.

The method according to claim 1,
The closed-type injection pump is constituted by a piston pump,
Wherein the closed type ejector is formed of a screw type.

The method according to claim 1,
Wherein the central axis is configured with a square cross section;
The discs are welded to each other with two discs obliquely inclined in the oblique direction from the center and welded at their ends. A rectangular hole is formed in the center of the disc to fit the center shaft, and a heating space communicating with the steam hole Wherein the drying device is a dryer for organic sludge.