JPS5829597A - Dehydrating device for sludge or the like - Google Patents

Abstract

PURPOSE:To improve dehydration effect by specifying shapes and positions of plural rollers among which endless filter belts are extended in a device which supplies sludge the upper and lower stacked endless filter belts and dehydrates the sludge while moving the filter bets. CONSTITUTION:Two endless filter belts 21 and 22 are stacked and circulated through intermediate rollers 111-115 and a high pressure roller 10; sludge (m) is supplied from an intake 8 to between both the filter belts to be dehydrated, and then discharged from an outlet 9 as dehydrated cake m''. In this casem the intermediate pressure rollers 111-115 among which the filter belts are extended are arranged from lower to upper while decreased in diameter, and the filter belts moving from a front roller to a succeeding roller faces down. The belts after passing the intermediate pressure roll group passes the high pressure belt dehydration part A of the high pressure roller 10, and the water in the sludge is removed efficiently to take the hydrated cake m'' out of the outlet 9 by a scraper 16.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel dewatering device for sludge, etc., which has extremely good drainage performance during dewatering, and removes water from fluid materials such as sludge by gradually increasing the dewatering pressure. Dewatering equipment for sludge, etc. that can reliably and easily remove sludge (
Regarding this.

As a device for dewatering sewage sludge, etc., endless filter cloth strips are stacked one on top of the other, and one end forms a sludge insertion port, and the other end forms a dewatered cake discharge port by passing a loop around a guide roller. A moving passage between the filter cloth strips is provided, and the sludge is transferred along the passage between the filter cloth strips and pressed by the passage between the filter cloth strips, and water is squeezed out from the sludge while being continuously taken out as a dewatered cake. A filter cloth type dewatering device of this type further includes a pressure belt around a filter cloth strap wound around a guide roller on the outlet side of the passage between the filter cloth strips. A device (Japanese Unexamined Patent Publication No. 123964/1989) that aims to increase the dehydration effect by winding the water under high pressure has been developed. Compared to this, the dewatering effect is quite high, and it is being widely used not only for sewage treatment but also as a dewatering treatment device for various types of sludge.

By the way, when adopting the above belt press type belt dewatering section, the preceding dehydration section: r'11 is an important point). t11 Wow, even if sludge is directly inserted into the belt dewatering section, it will cause a slip phenomenon and will not exhibit any dewatering function. In order for the belt dewatering section to perform its dewatering function, it is necessary to dehydrate the sludge in the previous stage.
High dehydration effect fA! (It is desirable to dehydrate the water at a low moisture content as much as possible before moss.)

However, with the conventional dehydration equipment Wi, -1-
Although the recording cloth belt was passed over the guide roller, there was a limit to the increase in the dewatering effect.Therefore, even if the belt dewatering section as described above was adopted, the effect was not greater than -1-0 This invention It was devised by paying attention to the following two conditions, and its purpose was to gradually increase the dewatering pressure (drainage + T during dehydration) [to remove fluid materials such as sludge. We provide a dewatering device for sludge, etc., which can reliably and easily remove water from sludge, etc., which can increase the dewatering effect as much as possible by using a high-pressure belt dewatering section, and which can make the device compact. .

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in the figure, the dewatering device 1 has two endless filter cloths i: ¥ 2 + + 22, and these filter cloth strips 2
It is configured to dewater fluid materials such as sludge on a daily basis while rotating □ and 2□.

Note: The momme cloth bands 21 and 22 are aligned with each other in the longitudinal direction, and are passed over the guide roller 3 so that a portion thereof is vertically aligned.

These guide rollers 3 consist of a pressure roller 4 which is wound with the filter cloth bands 21 and 22 in a state of being folded together, a holding roller 5 which is wound with the filter cloth strips 21 and 22 separated at other parts, and a d1 cloth. Obi 21,
22 and a tension roller 6 for applying tension, each of which is rotatably provided in a predetermined arrangement. The part where the filter cloth strips 2 and 22 are joined together forms a passage 7 between the filter cloth strips, through which sludge and the like are transferred while being pressurized, and one end of this passage 7 is used for inserting the sludge. A mouth 8 is formed, and the other end is a dehydrated sludge cake t J
A dehydrated cake discharge port 9 is formed to discharge J+.

Further, the pressure roller 4 is a high-pressure roller 10 which is a final stage roller forming a high-pressure belt dewatering section A of a belt press type.
and an intermediate pressure roller 11 forming an intermediate pressure dehydration section B which is a preceding stage dehydration section.The features of the present invention are the shape and arrangement configuration ζ of this intermediate pressure roller 11. That is, the intermediate pressure roller 11 includes five rollers 111 in the illustrated example.
~11. The sludge insertion port 8 is located below and the dehydrated cake discharge port 9 is located above.
Zigzag along the vertical direction (to form a serpentine shape)
The diameters of these intermediate pressure rollers 11 are made smaller in steps from the bottom.

In addition, among these intermediate pressure rollers 111, the lower end of the next roller in the moving direction is set slightly lower than the one end of the previous roller, and the passage 7 between the filter cloth strips between each intermediate pressure roller 11
is inclined downward with respect to the direction of movement. It cannot be said that it is effective in terms of performance and cost that the water cut-off area is as small as possible and the length of the filter cloth between rollers that does not contribute to dehydration is short, but the present invention takes these points into consideration as follows. It is stipulated that

(1) The distance between the first roller 111 diameter D1, the second roller 112 diameter D2, and the distance between their horizontal axes ζ
This means that the following relationship holds true.

(2) The remaining medium pressure dewatering section rollers 113, 114
The centers of rotation of and 11 must all be accommodated within the above dimension range.

(3) Furthermore, if the leading dewatering roller diameter DF and the succeeding dewatering roller diameter are DA, then the following formula must necessarily hold true between them and the vertical axis distance H.

With the intermediate pressure roller 111, the 10th - on the sludge insertion port 8 side
The rollers 11 and 11□ are formed by perforated rollers having a large number of holes on their surfaces to increase the dewatering ability. Then, a filtrate receiver 12 is provided on each side of each medium pressure port 11, roller 11 and high pressure roller 10, and the liquid that may be dehydrated at each roller portion is removed. This is the "collection".

On the other hand, the high-pressure belt dewatering section Aij is supported at 13 points by rollers'! Also, one side of the high pressure belt 13 is AM,
The high-pressure roller 10 presses the cloth strips 2□ and 22, and the filter cloth strips are forcibly pressed down. The high-FT roller 10 is formed by a perforated roller, while the high-pressure belt 13 is composed of a number of short belts lined up. Song style ru 2 water is coming”: sea urchin 7: f is coming.

The feed box section 14 for storing and supplying sludge etc. is connected to the sludge insertion port 81, and the bottom γ<3 of the feed box section 14 is connected to the bottom 171 cloth band 22 (commonly Sections are formed.
The lower part of the filter cloth up to Ra 111 (?iS: 22) is passed along a gentle upward slope, and the feed box part 1
The primary gravity dewatering section C is formed between the sludge insertion port 8 and the sludge insertion port 8.
1 is formed as a secondary gravity dewatering section, and is configured to first filter sludge and the like by gravity. f,
f, 15 is stirring 4"l' while adding flocculant to sludge etc.
16 is a suction scraper provided to peel off the dehydrated cake adhering to the upper and lower filter cloth bands 21 and 22t at the dehydrated cake discharge port 9; filter cloth band 21
．． 18 is a meandering correction device provided to correct the meandering of the filter cloth bands 2+ and 22.

Next, the operation of the embodiment described above will be described.

The sludge m supplied to the feed box part 14 while being mixed with a flocculant via the flocculator 15 first becomes a primary gravity dewatering flow SC as it moves between the upper filter cloth zone 21 and the lower filter cloth zone 22. The sludge enters the filter cloth passageway 7 from the sludge insertion port 8 while being naturally dehydrated, and then moves to the medium pressure dewatering section B while being naturally dehydrated at the secondary gravity dewatering section.

The sludge m that has reached the middle LL dewatering section Bζ is transferred to each middle n: roller 1.
When winding and moving 1, fLli, j cloth bands 21, 22
The suppressive force between them will cause dehydration. In this case, the dewatering roller is 11+11 closest to the sludge insertion port.
4. The diameter is super large diameter, hereafter referred to as fjpi cloth belt 2], 22
As the process progresses, the roller diameter is gradually reduced. This divine dehydrator's T dewatering pressure P- (T: tension force of filter cloth, D: dewatering roller diameter). Therefore, when using super-large diameter rollers, the dewatering pressure becomes smaller and the cake can be spread at a smaller angle, so it does not require multiple pre-pressurization and expansion, as seen in conventional machines (like many dewatering rollers installed side by side). No water mechanism required.

In addition, the dewatering time increases in proportion to the roller diameter, so even if you gradually reduce the roller diameter from an ultra-large diameter roller, the overall dewatering time will be 1f, more than twice that of the conventional machine, so the pressing force will gradually become smoother. Therefore, the sludge can be reliably dewatered without slipping or stirring.In particular, it is possible to remove water by moving the filter cloth bands 2+ and 22 from the bottom to the top. From this point, the filtrate flows into the next roller. The downward slope prevents the previous roller from flowing backwards, resulting in extremely good drainage performance.
The filtrate can be reliably collected on each of the rollers 11+ to 115.

The sludge m, which is successively dehydrated in the medium-pressure dewatering section B and has a relatively low water content, is then transferred to the high-pressure belt dewatering section Al, where it is forcibly subjected to pressure by the high-pressure belt 13. The cake is further dehydrated, and is discharged from the dehydrated cake outlet 9 as a solid dehydrated cake m that has lost moisture.

In this way, when the sludge is passed through the high-pressure belt dewatering section A, the sludge has been dehydrated in advance using the medium-pressure dewatering section B and the trowel as described above, so the sludge can be dewatered reliably and easily without slipping. Therefore, the dehydration function or dehydration effect of the high-pressure belt dehydration section A, which is the belt dehydration section, can be fully exhibited.

A rotary drive device (not shown) is connected to the high pressure port 10, and thereby the upper filter cloth band 21 and the lower part 6. ,
, y fabric belt 22 are rotated at the same time, and the rotation speed here is variable. .

In summary, the present invention provides the following excellent effects.

(1) By moving the passage between the filter cloth strips from the bottom to the bottom, it is possible to prevent the dewatering liquid from naturally moving in the direction of movement. Between the rollers (downward in the direction of movement of the passage between the filter cloth strips)
This slope prevents the filtrate dewatered by each guide roller from flowing back, so water drainage is extremely good and the tcod/M liquid is reliably collected with each guide roller. It's coming.

(2) Also, as the diameter of the guide roller, the roller diameter closest to the sludge insertion port (till) is selected as an extremely large diameter, and lj
9) is formed small in the direction of movement of the passage between the filter cloth belts, so that the dewatering pressure generated by the bends 11 of the passage between the filter cloth belts can be smoothly raised step by step. In addition, the dewatering time is extremely long, and it is possible to reliably and easily dewater sludge, which is considered difficult to dewater in the past.

(3) In particular, water can be reliably and easily removed from fluid materials such as sludge by gradually increasing the dewatering pressure as described above, but this sludge is then introduced into the high-pressure belt dewatering section. Therefore, the dehydration effect can be increased as much as possible.

(4) Furthermore, by forming the passage between the filter cloth strips in a meandering manner in the vertical direction to create a three-dimensional structure, it is possible to make the device more compact and save space.

[Brief explanation of the drawing]

The figure is a schematic side view of a sludge dewatering device showing one embodiment of the present invention. In the figure, 21 and 22 are filter cloth strips, 7 is a passage between filter cloth strips, 8 is a sludge insertion port, 9 is a dewatering cage discharge port, 3 is a guide roller, and A
is the high-pressure belt dewatering section. Patent applicant: Ishikawajima-Harima Heavy Industries Co., Ltd. (1 other person) Representative patent attorney: Nobuo Kinutani

Claims (1)

[Claims] 1 An endless filter cloth band is placed on top of the top, one end forming a sludge inlet and the other end forming a dewatered cake outlet; the filter cloth moves across the guide roller; jB: Opening A dewatering device ζ is installed in which the sludge, etc. is dehydrated by the high-pressure belt dewatering section of the final stage roller while passing through the passage ζ. The guide rollers are arranged so as to form the passage between the filter cloth strips in a meandering shape, and among these guide rollers, the loan diameter closest to the insertion opening (hereinafter referred to as The diameters of these filters are formed to be smaller in sequence, and the passages between the filter cloth belts are made downward with respect to the direction of movement. Dewatering equipment for sludge, etc.