FI62000C - FILTERPRESS FOER AVVATTNING AV AVLOPPS- ELLER KONDITIONERINGSSLAM - Google Patents

Description

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(48) Patent granted on 10 11 1032

Patent patent

(51) Ky.ik.Vci.3 B 01 D 33/12, 33/04 FINLAND — FINLAND (21) Pmnttlh »k * m» -Hfnomatotof I803M

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_ \ (441 Nlhtivilulpenon] «moonLjulkaiau pvm.— __ Q_ PMtnt · OCh r * gi« t * r * tyr * l ** n Aiw64un uthfd oeh utMkrtfMn pubUc «rad 30.0". O2 (32) (33) (31) W «er« tuolkwi ~ Wgif4 prtorktt 13.06.73 03.07.73 German Associations asavalta-Förbunds-republiken Tyskland (DE) P 2330029.0 p 2333680.3 (71) Alb. Klein K.-G., D-52U1 Niederfischbach / Sieg, Federal Republic of Germany - Förbundsrepubliken Tyskland (DE) (72) Wendel Bastgen, Betzdorf / Sieg, Federal Republic of Germany-Förbundsrepubliken

Tyskland (DE) (7U) Berggren Oy Ab (5U) Filter press for removing water from sewage or air-conditioning sludge - Filter press for water treatment with air conditioning sludge

The invention relates to a filter press for removing water from sewage or air-conditioning sludges with at least two screen belts guided around the drum and covering both sides of the running sludge or press cake in progress.

One such method and an apparatus suitable for carrying it out are disclosed in German Offenlegungsschrift No. 1,960,787, which comprises a filter press with a screen belt partially guided around a single drum and between which the dewatered sludge is treated. However, this equipment has been shown to have insufficient dewatering capacity. The same drawback is present in the devices disclosed in U.S. Pat. No. 2,111,720 and German Pat. No. 689,090, which have a similar method of guiding the belt. This deficiency is probably due to insufficient decomposition of the air-conditioning sludge or the like during the dewatering event.

It is an object of the invention to provide a device corresponding to the preamble which does not have the above-mentioned drawbacks and which is able to provide a large dewatering capacity with good space utilization, i.e. a ratio of active strip length to total length of less than 50% considering installation spaces is becoming increasingly relevant.

The basic idea of achieving this goal is to form at least two drums in the dewatering apparatus into dewatering drums and to partially surround their casings with a sieve belt conveying between the sludge. In this case, the dewatering drums are preferably mounted to rotate in opposite directions and to support the screen belt in a vertical section of approximately S-shaped track. The casings of the dewatering drums are either grooved or torn steel plates or pipes parallel to the axis of the drum so that the filtrate from the slurry flows into the drum and can be removed therefrom.

According to the invention, these dewatering drums form two - in most successively mounted drums in proportion - several compression zones in the belt-contacting area of the circumference, between which the S-shaped belt outlet causes the cake to fluff, whereby the water-conducting sludge pores break and dispense water.

According to the invention, there is provided a filter press for removing water from a sewer or air conditioning slurry, the press comprising at least two screen belts covering the rotating dewatering drum and rolls covering the running sludge or press cake together, forming a pressing zone in the area of the contact angle and which are possibly affected by the press rolls in the region of the compression zone, and the invention is characterized in that the dewatering drum is connected in front of a substantially straight pre-compression zone formed by screen belts and compression rollers or similar compression members, and that at least one further the sieve belts partially surround the S-shaped dewatering drums, forming a substantially straight zone between them, and that the sieve belts passed through the rollers form the last after the dewatering drum, the outlet of the press cake far from the drum. In this case, the slurry is subjected to rhythmic pressure and continuous shear forces. the latter - after thorough fluffing of the sludge or press cake when running from the first 3 62000 dewatering drums - acts in the opposite direction.

In this connection, the press cake is guided in the opposite direction by a second dewatering drum through a curved pressing zone.

Said pulsating pressing force is obtained by pulling the pressing cake between the sieves at a constant speed - according to another feature of the invention - under the pressing rollers or pressure rollers on the casing of the dewatering drum (s), which rollers preferably have an increasing pressing pressure in the conveying direction.

In this case, it has proved very advantageous to select a contact angle of the screen belt - which mainly determines the length of the compression zone - greater than 180 ° and to mount said compression and / or circumferential rollers on at least this drum circumference part. The longer this compression zone, the more strongly the shear forces can be caused by the shear forces caused by the movement of the belt around the dewatering drum. The outer belt must travel a longer path relative to the inner belt so that - at the same belt speed - the outer belt follows the inner belt a distance corresponding to the product of the radius difference, i.e. the thickness of the cake, and the contact angle. This deceleration of the outer belt creates the necessary shear effect in the cake. It is because of this cut in the cake that more water is removed from the cake; no further explanation is required that the aforementioned change of direction between the dewatering drums contributes greatly to this effect.

Within the scope of the invention, the pressure of the circumferential rollers, each of them separately or in a larger group, is adjustable, which can be achieved simply by a tensioning device, for example a rope, which touches lever arms mounted according to the invention and attached to a drum carrier and elsewhere. This rope, which is tensioned in the circumferential direction of the dewatering drum, is on the adjustable cams of the lever arms or rocker arms, for example, whereby when the rope is tensioned, the force component perpendicular to the lever arm of the rope force increases. The gravity of the circumferential rollers is thus adjusted depending on the adjusted lever arm between the joint of the rocker arm on the one hand and the cam on the other.

According to a further aspect of the invention, the pressure of the press rolls which are displaced relative to each other in the direction of travel is increased and / or equalized by a plurality of press plates mounted on them. Such pressure plates can be mounted on both sides of screen belts which run approximately parallel in the pre-compression zone and possibly are pressed together against the belts, which provides an additional possibility for adjusting the roll pressure.

\ * 1) 62000

Preferably, the press rolls can be formed into parts of a continuously rotating weight belt or the like and connected by chains. In this case, depending on the device you are eating, you will not be able to move these press belts by external force or by the friction of the sieve belt. The chewing belt can also pull the screen belt without the drive. Otherwise, the movement of the belt is known per se with traction rollers or, in the present invention, also with dewatering drums.

In the apparatus according to a highly preferred embodiment of the invention, one screen belt passes from the feed chute or the like approximately horizontally to the turntable and forms a filtration or dewatering zone in this part. From the turntable roller, the sieve belt - together with the second belt next to the turntable roller - passes in the opposite direction through the pre-compression zone, at the end of which both sieve belts are led together to the first dewatering drum. According to the invention, the circumference of this is in use from a range corresponding to 220-240 °. After the first dewatering drum, the screen belts pass around a second such approximately horizontal dewatering drum, which they cover from a region of a greater angle.

From the second dewatering drum - the last in the case of several dewatering drums - the treated press cake is removed and each screen belt is returned to either the filtration or pre-pressing zone. On the way, the screen belts are preferably brought into contact with some of the circumferential rollers on their side away from the drum, and in this way the compression pressure of the latter is increased.

Such a filter press with two dewatering drums with a diameter of 1 m has an active belt length of approximately 16 m, whereby the total length of the device does not exceed 2.5 m. the space utilization rate is over 70% t which is surprisingly higher than with comparable filter presses or similar devices.

Embodiments of the invention will now be described with reference to the accompanying drawings, in which: Figure 1 is a schematic longitudinal section of a press with two opposite parallel dewatering drums, Figure 2 detail and Figure 5 is a detail of Figure 4.

5 62000

The filter press R has two large dewatering drums 1 and 2, which in the vertical plane are connected in an S-shape by two sieve belts 4 and 5 guided in parallel in places, the contact angles of which are approximately m (e.g. 235 °) and n (e.g. 285 °).

The slurry cake Q to be processed to be fed in the feed direction t is conveyed by the first sieve belt * 1 to the conveying direction by means of the brackets 6 through the filtration zone to remove the filter cake Q from the first amounts of water exiting the collector chute 7 from the sieve holes 4.

With the turning roller B of the sieve belt 4, the partially dewatered slurry cake Q falls on the upper surface 5Q of the second sieve belt 5 adjacent to the turning roller, whereby it is subjected to mixing and shaking. The first screen girdle 4 of the underside of the 4u and a second screen belt 5 a top 5Q between the fed sludge cake Q through the pre-press zone, where it is treated on both sides vyöosia 4U and 50 mounted BY alternating order, press rolls 9 Each of the press rolls j I 9 rows pressed against the pressure plates P with the co-operating power unit 10 with belt sections against 4U and 5Q. For the sake of simplicity, the belt deflections caused by the rollers 9 are not shown in the drawing.

From the pre-pressing zone, both screen belts 4 and 5 with their press cakes Q pass between the dewatering drum 1 at an angle m, which determines the length of the main pressing zone where the screen belts 4 and 5 are guided between the drum ring 11 and the circumferential rollers 40.

The drum jacket 11 consists of either a grooved steel plate or a torn plate or, according to Fig. 2, tubes 41 parallel to the drum axis, between which the extruded filtrate can flow into the drum J. The tubes 41 have side bores not shown in penetrates the tubes and can then be removed from the drum ends.

The press rolls are held tensioned against the drum shell 11 by a power device 42, which applies to either a single roll or a larger unitary roll group. Each press roll 40 is pivotally mounted by means of a rocker arm 44 at 46 on a press body 45 or the like.

These rocker arms have movable cams 47, mounted on a tensioning rope ^ 8, the tensioning force of which can be adjusted 62000 6 by a power device 42 - here a winch. This compression: device 42-48 allows the lever arm to be adjusted to adjust the compression force of the roll 40 by adjusting one of the hv · π. when the rope 48 is tensioned, the force component of the rope force perpendicular to the rocker arm 44 increases, whereby the compressive force of the press roll 40 changes relative to the attachment point 46 of the lever arm and the rocker arm 44 and the cam of the tension rope 48.

The compressive force is further increased by the tension of the returning belt portions 4 and 5 in the area C, where the total pressure rollers 40 - or individual pressure rollers 40 - are also used to guide the belt.

At the contact angle m in point 50, where the screen belts 4 and 5 deviate from the pressing zone of the drum 1, the press cake Q between the screen belts 4 and 5, hitherto bent according to radius r, is abruptly straightened, causing stretching the structure of the compression cake Q and is prepared for the next compression treatment, in the same way as has previously occurred under the influence of gravity in the transition from the filtration zone to the pre-compression zone D 1.

When the broken compression cake Q enters the jacket 11 of the latter dewatering drum 2 at the end of the relatively uncompressed zone P, it is bent again, now in the opposite direction i 1, whereby the effect is intensified by the belt tension and compression by the first circumferential rollers α. By means of this operation, large amounts of liquid can be further compressed from the press cake Q having a completely different structure as it passes around this dewatering drum 2, which would be impossible without the described recoating. The constant shear force caused by the faster running inner belt 4 actually helps in dewatering.

The dewatering drums 1 and 2 can rotate at both synchronous speeds and - at least to some extent - at different speeds, using a drive with different transmission transmissions.

Once the screen belts 4 and 5 have left the dewatering drum 2 in the region of the rollers 40z, they and the dewatered filter cake 0 are passed over the common turntable 50 to the small rollers 52, the turntable 7 62000 50 - mounted at the apex of an imaginary triangle having a common edge. the sides passing through the shaft of the drums and forming with the connecting line of these shafts (Fig. 1) an angle v of approximately 35 ° "cooperates with the circumferential rollers 51. In addition, part of the draining screen belt sections 4e and 5e touches the press rolls 40 of the boundary dewatering drum 1.

The two rollers 52 are mounted somewhat apart and form an outlet 53 between the belts 4 and 5 to remove the filter cake Q. From the outlet 53, the return or end portions 4 and 5e e are led first over the circumferential rollers (area C) and then through the belt rinsing device 56 and over the upper reversing roller back to the filter zone and the pre-compression zone Dj.

Pre-press zone Dj specific embodiment is shown in Figure 3. This is both press rolls 9U belt portions 4u and 50 below, and also the press rolls 9q site of the connected BY roller bearings 60 chain links in the direction of 60 arrow p endlessly traveling clamp portions 62q and 62U, which can be compared with the needle bearing or the like to flexible kept by.

The operation of these pressing rollers 9 takes place by contact friction from the belts 4 and 5, whereby the pressing tongues 9 are pressed in the pressing zone Dj against the inner surface of the screen belts 4 and 5. On opposite sides of the pressing rollers 9, opposite pressing rollers P1 and Pg are mounted on these rollers 9. Now that the chains 61 are pulled over their sprockets 63 and 64 in the direction of travel of the screen belts 4 and 5, the rollers rotate on a stationary pinch roller P. The circumferential speed on the opposite side is then twice the speed of movement of the chains 6l. This has the advantage that relatively high pressures can be provided by relatively thin-walled and light weight or pressure rollers 9 *, as these are not affected by bending forces perpendicular to the axis. The bending forces are compensated by the press plates P above.

The clamp plates P are spring-loaded against each other at 65, so that the external support structure does not have to withstand these forces.

Especially with light belt constructions, the sprockets 63 and 64 can be driven from the outside, carrying the screen belts 4 8 62000 and 5 through the press parts 62 in the i direction. The belts 4 and 5 are then no longer used by traction rollers or rollers 8, 50 and 55 or resulting in a heavy load at the transmission point on the belts 4 and 5 - but on several rollers 9 in the area where force is really needed for pressure transmission, in other words the screen belts 4 and 5 are no longer pulled by the drive drums 1, 2, 50 and 55 through several roller bands. with an efficient transmission corresponding to the pressure, evenly distributed over the entire large surface.

By selecting different diameters d and shaft distances f for the upper and lower press rolls 9, more or less strong sinusoidal bends can be obtained on the screen belt surface, between which there is a press cake Q. In addition, relative movement at different speeds 62q and 62U of the upper and lower press drums can be achieved.

The embodiment shown in Fig. 4 R 1 lacks the filtration zone D 1. Here, the slurry cake Q is fed directly to the pre-compression zone Dj, which is located below the dewatering drums 1 and 2. The press rollers 9 are loaded with pressure plates P which are pivotally mounted in collecting chutes 7 ·

The slurry cake is passed from the pre-compression zone Dj to the first dewatering drum and from there to the compression zone D1, via the compression zone Dj. In this case, the belt 4 brings the pressed cake O to a turntable 90 with an outlet chute 91. This belt 4 is then passed through a cleaning zone 56 with a collecting chute 93 - consisting of two rollers 92 and a belt 4 - and then passed through second turntables 55 »8 back to the pre-compression zone Dj.

The second belt 5 is separated from the lower belt 4 above and between the dewatering drums 1 and 2 and is led back to the pre-pressing zone jDj either directly on the pressing rollers 40 or over the second turning rollers and through the washing zone 56. At the washing point 56, the washing water is collected in a robe 94, from which it is then removed via a line 95.

In order to be able to pre-remove water in this embodiment as well, an additional screen, not shown in the drawing, can be provided in front of the inlet.

9 62OC0

The dewatering drum 1 shown in Fig. 5 carries a filter cake Q between them in the belt part 3 of the screen belts 4 and 5. Both screen belts 4 and 5 surround the drum shell 11 in an area approximately - consisting of roll angles m ^ - at an contact angle m (235 ° ) and .leaves in the lower part 50 of the dewatering drum 1 rotating in the direction i

The surface 4 of the outer belt has, in the compression zone determined by the contact angle m - fourteen in Fig. 5 - compression rollers 40 which press against the casing 11 of the drum.

In the circumferential direction, the roller axes are interconnected in planar projection by traction loops 75 in different planes relative to each other, whereby in the direction of travel the first roller shaft 70 is connected by radial rollers 76 to a transverse member 77 belonging to the drum body.

The functional length c of the loops can be changed by the adjusting screw 78, as well as the functional length of the radial rods 71 can be changed by the support nut 72 within certain limits.

Such a filter press with two dewatering drums 1 and 2 has an active strip length of approximately 16 m with a drum diameter of 1 m, whereby the total length of the equipment does not exceed 2.5 m. The so-called belt utilization rate is over 70% and is significantly higher than the same ratio with comparable filter presses or similar devices.

Claims (7)

10 62000 1. Filter the inpurist into the water to remove water from the emir or tai I mastoin account, which press contains at least two turn-of-the-art sludge or press cakes run together around an inverted dewatering drum (1, 2) and rollers. (Q) a mutually covering screen belt (4, 5) forming a pressing zone (D 1, D 2) in the region of the contact angle for reciprocal removal of water from the slurry or press cake (Q) and possibly affected by the pressure rollers in the region of the pressure zone, characterized in that the dewatering drum (1) is connected in front of a substantially straight pre-compression zone (D1) formed by screening belts (4, 5) and pressing rollers (9) or similar pressing members, and that at least one further dewatering drum (2) with the opposite direction of rotation is thus arranged so that the screening belts ( 4, 5) surround the dewatering drums (1, 2) in a partially S-shape, forming a substantially straight zone (P) between them and that the screen belts vi preferably through the rollers (52, 150), after the last dewatering drum (2), form the outlet of the press cake (Q) located far from the drum. Filter press according to Claim 1, characterized in that the contact angle (m) with the dewatering drums (1, 2) is at least 180 °. Filter press according to Claim 1 or 2, characterized in that the dewatering drums (1, 2) have different high rotational speeds. Filter press according to Claims 1 to 3, characterized in that the pressure of the press rolls (40) is adjustable for each individual and / or group thereof. Filter press according to Claims 1 to 4, characterized in that the pressing rollers (40) are pivotally fastened for adjustment by means of torsion arms (44) or the like. Filter press according to Claim 5, characterized in that the torsion arms (44) of the press rolls (40) are fastened to the body (45) of the dewatering drum (1 or 2). T1 62000 Filter press according to one of Claims 1 to 6, characterized in that a dewatering zone is located between the last dewatering drum (2) and the roll (s) (52, 150) forming the outlet of the filter press.