JPS58125398A - Belt press type dehydrating device - Google Patents

Abstract

PURPOSE:To efficiently execute gravity dehydration, by separating the foreign matter adhering onto a baffle board, by displacement of the baffle board, and pushing aside sludge by sufficiently wide width. CONSTITUTION:Sludge supplied onto a filter cloth belt 1 is carried in the direction as indicated with an arrow 19, is plow-divided in the width direction of the belt 1 by baffle boards 33a, 33a..., and becomes a peak-like sludge ridge. The sludge is squeezed by this plow-division, leached free water flows down to the part where the belt surface has been exposed, between the sludge ridges, permeated cloth meshes of the belt, and drops down. When the sludge which has been pushed aside like ridges passes through the lower part of a sheathing plate 46, it is pressed by the sheathing plate and becomes a sludge layer of specified thickness. This sludge layer is plowed again by the following baffle boards 33a, 33a..., the belt surface is exposed and the sludge is squeezed, also separation of free water advances, and water content in the sludge is squeezed. The sludge which has become like a peak again by being squeezed is further crushed by a sheathing plate 47, becomes a flat sludge layer, and is carried toward the following squeezed roller.

Description

Detailed Description of the Invention The present invention provides a baffle plate to increase the efficiency of osmotic dewatering in the gravity dewatering section, and periodically moves this baffle plate to prevent foreign matter from adhering to the baffle plate. The purpose is to provide a belsiveless type dehydrator that requires maintenance.

In water treatment facilities, such as sewage treatment facilities, the sludge generated in the water treatment process is treated as abscessed sludge with a water content of 96 to 98.
It is a liquid substance, which is sent to incineration, landfill, or other salt treatment processes as a dehydrated cake with a moisture content of 60 to 80% using a dehydrator. Such a dehydrator is required to lower the water content of the dehydrated cake as low as possible, and to maintain this state while ensuring dehydration processing capacity.

FIG. 1 shows a conventional belt press type dehydrator for sludge treatment. In the figure, (1) and (2) are both endless filter cloth belts, and (1) is above the supply hopper (3).
The sludge (4) supplied above passes through the gravity dewatering section (6) by the movement of the upper belt (1) in the direction of the arrow (5), and then reverses its direction of movement at the tension roller (7). Then, the upper belt (1) and lower belt (2
), and the driving roller (9), the aperture p-ra αG, αDSQ! , (13, α Passes through the outer periphery of the turret and is dehydrated under compression due to the tension of both bells F, and is discharged as a dehydrated cake (l@) from the openings of both belts.

In this way, the sludge contains a large amount of water when it comes out of the supply hopper (3), and in the gravity dewatering section like (6) or (6)', the upper belt (1) or the lower belt (2) As the filter plays its role, the water that passes through the grains of the filter cloth belt due to its own weight falls down due to gravity, and the water content in the sludge decreases considerably by the time it reaches the squeezing roller (1% I...). In order to make the dewatering action by compression on the outer circumferential surface of these squeezing rollers more effective, it is important to increase the dewatering rate in the gravity dewatering section.

By the way, in the gravity dewatering section, if sludge is simply poured onto the belt and the sludge completely covers the belt surface, the belt's mesh will be blocked by sludge particles, making it difficult for water to penetrate and flow down smoothly. . Therefore, it is necessary to scrape out the layered sludge and make one ridge to partially expose the surface of the filter cloth so that the free water can flow away from that part.

Therefore, in the present invention, a baffle plate is provided in the gravity dewatering section, which has a slight inclination with respect to the flow of sludge and is perpendicular to the filter cloth belt, and is in contact with the filter cloth belt. This method efficiently performs gravity dehydration.

However, in this case, the sludge contains many fibrous impurities such as lint, cloth, human hair, and layered sludge. The sludge gets caught in the filter belt, and the gap between the baffle plates is clogged as sludge gradually accumulates there, causing the flow of sludge to become noticeable and scratches on the surface of the filter cloth belt. Must be.

For this reason, it has been considered to scrape out the sludge by rotating a spiral screw in contact with the filter cloth, but in this case, the screw and the filter cloth only come into contact at points, so the filter cloth The exposed im* of the belt is narrow and dewatering efficiency is poor.

Therefore, the first object of the present invention is to improve the dewatering efficiency in the gravity dewatering section, and for this purpose, a baffle plate is provided in linear contact with the filter cloth belt, and the filter cloth belt F formed by scraping the sludge is provided. The second purpose is to periodically displace the baffle plate in a direction away from the surface of the filter cloth by shaking the baffle plate, etc., to remove contaminants attached to the baffle plate. It is an object of the present invention to provide a belt press type dewatering machine that can be periodically and automatically disengaged and requires no manpower for maintenance and monitoring, and that can be maintained easily.

Next, examples embodying the present invention will be described in detail with reference to the attached drawings. Here, FIG. 2 is a perspective view of a gravity dewatering section of a belt press type dewatering device which is an embodiment of the present invention, FIG. 3 is a side view of a baffle plate portion used in the same device, and FIG. A side view of a weir plate portion used in the device, and 5th wJ is a front view of one baffle plate portion. In these figures, the filter cloth belt (1) runs in the direction of the arrow (to) while being held between the left and right sludge guides (2), (2), and transports the sludge supplied at the rear to the front. The sludge guide (B) and (To) each have four bearings -1 (To).
, (2), ■ and (goods), (to), (to), @ are attached, and the shaft (2) rotatably supported by the bearings (to) and (to) has a cross section. Shape baffle bracket (
2) is fixed to the bottom plate (to) of the bracket (2) by bolts (2), (2), (to), and (311) perpendicular to the filter cloth belt (1). 4 rows of baffle plates (33m), (33m), (33m),
(33) is fixed. Baffle board (331)
is attached to the bracket at an angle of - with respect to the traveling direction as of the filter cloth belt (1). These buff A/boards (331), (33m), --...
There are also three rows of baffle plates in front of the (33b), (33b),
(33b), like the rear baffle plate (33&), is fixed to a baffle bracket (to) which is fixed to a rotatable shaft supported by a bearing (2). A horizontal link (to) is swingably connected to each shaft end of the two shafts (to) and the bottom via a lever (to) and (2),
The tip (to) of the horizontal link (to) is the sludge guide (2)
The hydraulic actuator is connected to a rod of a hydraulic actuator that can swing around a bolt thread screwed into the cylinder, and the hydraulic actuator operates periodically.

The baffle plates (331), (33s,... and (33)
b), (33b), ... and the baffle plate (33b)
), (33b), ..., bearings (2), (2
) and (2), a shaft -1- rotatably supported on (to)
is attached to each shaft, and a weir plate -1 that moves diagonally downward in the direction of movement of the belt (1) is attached to each shaft (good).
- is fixed, and two springs &-1- and -, -, which protrude rearward from both shafts u1-, are fixed.

The bolt screwed onto the spring plate -1- is a #14m set bolt whose downward protrusion can be arbitrarily adjusted depending on the tightening position, and its tip is the sludge guide surface, (2)
The bolt contacts the set plate which protrudes in the direction of the belt (1), and depending on the amount of protrusion of the bolt, the forward inclination angle of the weir plate -1 or the force of the weir plate -1 to press down the sludge N# mallet increases. adjusted.

Next, the operation of the above embodiment will be explained in more detail.

The supply hopper (3) in front of the gravity dewatering section
(1) The sludge fed upward is transported in the direction of arrow (2) by the belt (1) and first passes through the lower part of the rear baffle bracket (2). At this time, the sludge was transferred to the baffle plate (33 m), (33 m), which was erected in contact with the surface of the bell) (1)...
As shown in Figure 5, the plow is divided in the width direction of the bell) (3J, and the sludge ridges (53s, (53&), ...) are formed into sieve-like sludge ridges (53s, (53&), ..., and baffle plates (33s), (33m), - Therefore, the sludge is squeezed by the action of this plow, and the leached free water flows between the sludge furrows (53@) and (the bell F! between 53 and 53) as shown by the arrows. !The sludge flows down to the exposed part (to), -1..., and falls through the grain of the belt.The sludge that has been pushed aside in this way, passes through the bottom of the weir plate. As shown in Figure 4, the sieve shape is crushed by being pressed by the weir plate, and a constant thickness q
This becomes a sludge layer (s a b).

This sludge layer (53b) continues into the front baffle plate (33b).
), (33b), ..., the sludge is plowed again, the belt surface is exposed and the sludge is squeezed, and the separation of free water further progresses, reducing the water content in the sludge. The sludge thus squeezed and re-sieved is further crushed by the front weir and is conveyed to the following squeezing rollers in the form of a flat sludge layer as shown in FIG. 4.

By alternately arranging the baffle plates and weir plates in this way, the sludge is plowed over and over again, and each time, the sludge is compressed and the belt surface is exposed to discharge and leak free water. Gravity dehydration progresses extremely efficiently. In addition, it is more efficient to plow the sludge layer in different places than to plow the same place in the width direction of the belt over and over again.
As shown in the figure, the front and rear baffle plates (33) and (33b)
) is preferably arranged with a slight shift in one direction of the belt. Furthermore, front and rear baffle plates (33”)% (3
The inclination angle (#) in 3b) may be set in opposite directions or in the same direction for the front and rear baffle plates as shown in the figure, or the inclination angles of the baffle plates may be varied in the front and rear or width directions. The angle of the baffle plate and the pressing force of the weir plate-1 are adjusted depending on the amount of sludge supplied per unit time. To adjust the angle of the baffle plate, please refer to Pol)el, @, -...
This is done by loosening the Nara F (50s, (51m), -...) that tightens the The number of baffle plates arranged in the belt width direction is not limited to the above number, and may be one or two or more rows depending on design conditions.

If gravity dewatering is continued while plowing in this way, impurities in the sludge will eventually get caught on the front end of the baffle plate (33 &) or become clogged between the baffle plates, as shown in Figure 3. However, in the above embodiment, the hydraulic actuator is periodically operated to move the horizontal link (to) to the arrow (to).
By pulling the baffle plate (33) in the direction of , impurities etc. attached to the baffle plate become brittle,
It is carried forward with the sludge. Hydraulic actuator 61 was installed in anticipation of the time when foreign objects were removed! When the sludge is returned to its original state, the baffle plate is inserted into the sludge, and plowing begins again in a clear line free of foreign matter. Baffle plate (3:l),
The lower front end of (33b) is chamfered or chamfered as shown in the third figure to prevent it from getting caught on the filter cloth belt. depart from.

In the above embodiment, the baffle plate (33 m) 1. (3
3b) was rotated around axis (2), (to), but
As shown in Fig. 6, a baffle plate (33 m), etc. is attached to the parallel link connecting the upper end of the parallel link 11 which can freely swing around the fulcrum -1, and a hydraulic actuator is attached to the parallel link connecting the lower end. By connecting the baffle plates, the baffle plates may be displaced in a circular motion while remaining parallel, or may be displaced directly in the direction of the artist. Also, the set plate for adjusting the pressing force of the weir plate may be attached to the spring plate 1 as shown in Fig. Even if it is attached to the side and pressure is applied to the spring plate-1 at its tip, the same function will be achieved.

As described above, in the present invention, sludge is sandwiched between two tensioned filter cloth belts and passed over the outer periphery of a plurality of squeezing rollers to remove moisture from the sludge and form a dehydrated cake* t
In a belt press type dewatering device, at least one row of baffle plates in the width direction of the filter cloth is provided in the gravity dewatering section that permeates and dewaters the water in the sludge by its own weight. In addition to providing the above, the baffle plate is periodically displaced in a direction away from the filter cloth belt surface, so that foreign matters adhering to the baffle plate are detached from the baffle plate by the displacement of the baffle plate. The belt press m dewatering equipment is characterized by the fact that it can sweep sludge over a sufficiently wide width, expose the inside of the belt over a wide area, and squeeze the sludge sufficiently, making gravity dewatering possible. is carried out efficiently, the final moisture content of the sludge can be effectively reduced, and the foreign matter can be automatically removed from the baffle plate before a large amount of foreign matter, etc. reaches the baffle plate. This reduces maintenance to just 7 days, and the belt press lid dehydrator, which previously could only be operated with monitoring, can now operate automatically and continuously.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a conventional belt press rod dewatering machine.
FIG. 2 is a perspective view of the gravity dewatering section of a belt-breath condensing and dewatering device according to an embodiment of the present invention, FIG. 3 is a view of the baffle plate portion used in the same device, and FIG. 4 is a perspective view of the same device. FIG. 5 is a front view of the baffle plate portion, and FIG. 6 is a schematic m-plane view showing an example of the baffle plate drive mechanism. (Explanation of codes F1, 2...filter cloth belt, book 53, 538% 53b
-Sludge, 6, 6'...Gravity dewatering section, 10, 11, 1
2, 13, 14-- Squeezing roller, 16... Dehydrated cake, 33 Turtle, 33b-- Baffle plate, 36, 37
--Lever, 3g--Horizontal link, 41--Hydraulic actuator, 46, 47-Shelter plate, 4 pieces 49...
・Spring plate, 5G, 51-・Set bolt, 56...
・Contaminants, etc. Applicant: Kinsha Co., Ltd. Kobe Steel, Ltd. Representative: Takeo Honjo, Benenshi

Claims (1)

[Claims] 1. A belt press type in which sludge is sandwiched between two tensioned filter cloths and passed over the outer periphery of wI number of squeezing rollers to remove moisture from the sludge and discharge it as a dehydrated cake. In the dewatering device, at least one row or more of baffle plates are provided in one direction of the filter cloth in a gravity dehydration section that permeates and dehydrates the sludge by its own weight, and is in contact with the filter cloth belt and sweeps the sludge in the width direction of the filter cloth; A belt press type dewatering device characterized in that the baffle plate is periodically displaced in a direction away from the belt surface. 2. The dewatering device according to claim 1, wherein the baffle plates are provided in two or more rows in the direction of movement of the filter cloth.