EP0873240A2

EP0873240A2 - Filter press

Info

Publication number: EP0873240A2
Application number: EP97944763A
Authority: EP
Inventors: Heinz Pietzka; Wolfgang Romih
Original assignee: LMB Schlamm-Hochdruckfiltrations GmbH; Pomih Wolfgang
Current assignee: HDF SCHLAMM-HOCHDRUCKFILTRATIONS GMBH; POMIH, WOLFGANG
Priority date: 1996-08-16
Filing date: 1997-08-18
Publication date: 1998-10-28
Also published as: WO1998006561A2; DE19632964C1; DE29615012U1; WO1998006561A3

Abstract

The invention concerns a filter press for the pressurized dewatering of sludges which are difficult to dewater. The filter press comprises: a plurality of pressure bodies which are disposed aligned in a row, take the form of hollow cylinders and comprise a spacing cylinder and two pressure plates disposed at both ends of the latter; a pressure chamber (16, 38) between each two adjacent pressure bodies; a cylindrical slide ring (39) per pressure chamber (16, 38), the slide rings being used to open and close the pressure chamber and each having an annular seal at both ends of the pressure body; and devices for driving the pressure bodies hydraulically in the direction of their successive arrangement. The filter press is designed such that: a frame structure with two end plates (1, 2) and tension rods (3, 4) between the latter is provided; a common hydraulic drive is provided for all the pressure bodies; each slide ring (39) is selectively provided with a separate or a common hydraulic drive for closing the associated pressure chamber, maintaining the closed position and opening the pressure chamber (16, 38); and such that each slide ring (39) comprises at least one filling opening and is axially movable such that the chamber volume can be varied.

Description

Filter press

The invention relates to a filter press for press dewatering of sludge that is difficult to dewater

- With a number of aligned pressing bodies in a row, which are designed as hollow cylinders and a spacer cylinder and two press plates arranged at both ends of the spacer cylinder, each with a pressing chamber between two adjacent ones

Compacts, with a cylindrical sliding ring per compression chamber, with which the compression chamber is to be closed and opened, each with an annular circumferential seal at both ends of the

Compacts and

- With devices for hydraulic drive of the pressing bodies in the direction of their arrangement one behind the other.

DE 3744771 A1 describes a device for pressing out gaseous and / or liquid media from a batch of pourable or free-flowing material by compression to the solid mass of a press cake in a horizontal row of press chambers known. Each baling chamber has a pair of spacing parallel, vertical planes. Of these, at least one press wall with means for filtrate drainage is designed as a filter element, pressure bodies being arranged between the press chambers. In this device, at least one press wall is formed by a press element held on the pressure body and horizontally displaceable independently of the pressure body.

In DE-C-290 718 a hydraulic cocoa press lying arrangement is described with elements formed from annular hollow bodies and press stamps in the manner of a standing pot press. The Pre ßstempel are dimensioned in their length so that they can largely eject the press cake from the hollow bodies after completed pressing and fixing the hollow body. In this known cocoa press, it is further provided that when the hydraulic piston is operated, the entire column is first advanced to the abutment until a cover plate, which closes the last hollow body, is pressed, and the resulting compression of the column causes the compression to take place. Only then is the entire column pulled back somewhat by coupling the shortened column with tie rods and return movement of the hydraulic piston, whereupon the hollow bodies are fixed in place by the next press ram at the same time. By advancing the row of punches with the press cakes in between, they are ejected from the hollow bodies, whereupon the press cakes are finally cleared by pulling the column apart.

US-A-3 073 238 describes a hydraulic press which has two series of multiple press chambers with filter plates for high production.

From DE-B-1 247 137 a multi-pot press for de-oiling cocoa is known, with press heads and pot pistons connected with sliding members are provided, the closing direction of which is opposite the pressing direction is and in the impression piston-cylinder units with piston rods formed from impression rods for opening the press and for ejecting the press cake are angeord net. In this known multi-pot press it is provided that the pressure cylinders are arranged axially displaceably in the crosshead of the press and are firmly connected to the press pot which is furthest away from the plunger.

The well-known chamber filter presses are cumbersome in their construction and therefore prone to failure. In addition, the finished pressed filter cake still has a relatively high water content, because they are operated with a low filtration pressure of maximum 25 bar.

The invention has for its object to provide a filter press of the type mentioned in such a way that it is robust and simple, therefore less prone to failure and is also operated with such a high pressure that the pressed filter cake has a relatively low water content.

This object is achieved according to the invention

that a frame with two end plates and tie rods is provided between the end plates,

- That a common hydraulic drive is provided for all press bodies,

that each sliding ring is optionally provided with a separate or a common hydraulic drive with which to close the associated press chamber, to keep the closed state and to open the press chamber,

- That each sliding ring has at least one filling opening and

- That each sliding ring is adjustable in the axial direction, so that the chamber volume can be changed. In this way, one arrives at a high-pressure filter, of the type mentioned in the introduction, which fulfills the above-mentioned inventive task.

In a further advantageous embodiment of the invention, the high-pressure filter can be designed so that a press cylinder is provided as a common drive for al le press body, which is arranged on one plate of the frame.

In addition, there is the possibility of making the arrangement so that at least one displacement cylinder is provided for each displacement ring, which is arranged between the displacement body and the associated press body.

The cylinder of the displacement cylinder is expediently arranged on a bearing block of the pressing body and the piston rod on a bearing block of the displacement ring.

In a further advantageous embodiment of the invention, it can be provided that the press walls are provided with a number of filtrate openings with filter cloths and filter material in the form of a filter cloth is provided within the press chambers in front of the filter openings.

Expediently, at least one filling opening is provided in the sliding ring for filling the open press chamber.

It is also recommended that a filtrate drain be provided in the compact. The invention is explained below using an exemplary embodiment. It shows

Fig. 1 a central longitudinal section through the high-pressure press filter designed according to the invention in the filling position,

Fig. 2 the same high-pressure press filter in the press position of the most extended plunger and

Fig. 3 the same high-pressure press filter in the ejection position with the plunger in the starting position.

The drawing shows three operating states of the high-pressure press filter designed according to the invention, namely in FIG. 1 the filling of the high-pressure press filter with sludge to be dewatered, in FIG. 2 the pressing of the sludge and in FIG. 3 the dropping of the dewatered filter cake.

The high-pressure filter has according to Figure 1 two spaced plates 1, 2, which are connected to each other via several tie rods 3, 4 and held at the required distance from each other.

In Figure 1, only two press chambers 16, 38 are shown, by means of which the high-pressure press filter and its function can be explained in the following, although in general a chamber filter press does not consist of just two press chambers, but rather twenty or more of them. Since in the presence of twenty baling chambers all baling chambers are the same, it suffices to explain the high-pressure filter shown in the drawing below using two baling chambers 16, 38.

A press cylinder 5 is arranged on the plate 1, the piston rod 6 of which has a press piston 7 at its cylinder-side end and a piston plate 8 at its opposite end. The Piston plate lies on an annular surface 9 against a filter plate 10. In the central region of the filter plate 10 in the vicinity of the longitudinal axis 1 1, a filtrate chamber 1 2 is provided, which has a filtrate outlet 13 with a bore 13a, which extends in the direction of the Arrow 14 can empty the filtrate chamber 12.

In the central region of the filter plate 10, drainage bores 15 are made in this. In front of these holes there is a filter cloth through which the filtrate chamber 12 is connected to the press chamber 16, which is on the other side of the filter plate 10 and filled with sludge. A circumferential seal 18 is provided on a shoulder 17 of the filter plate 10.

With a distance from the filter plate 10, a counter plate 19 is provided, which likewise has filtrate openings 20 and a filter cloth and is otherwise designed like the inner region of the filter plate 10.

The counter filter plate 19 is followed by a cylindrical housing part 21 which, on the side opposite the counter filter plate 19, has a filter plate 22 which contains the filtrate openings 23 and a filter cloth and is otherwise designed in the same way as the counter filter plate 19.

An abutment 24 is provided on the cylindrical housing part 21. On the opposite side, a filtrate drain 25 is provided on the housing part 21, which has a bore 26 through which the filtrate can flow outward from the filtrate chamber 27 in the direction of arrow 28.

With a distance from the filter plate 22, a further counter filter plate 29 with filtrate openings 30 and a filter cloth is provided, which is connected to the plate 2 via a cylindrical housing part 31, a hole 32 in the plate 2 for the filtrate to flow out of the filtrate chamber 33 is provided in the direction of arrow 34 to the outside. A circumferential seal 35 is provided on the filter plate 22, as on the filter plate 10. Correspondingly, circumferential seals 36 and 37 are also provided on counter filter plate 19 and counter filter plate 29.

Between the filter plate 2 and the counter filter plate 29, a press chamber 38 filled with sludge to be dewatered is formed, which otherwise has the same dimensions and the same design as the press chamber 16.

The pressing chamber 1 6 is closed all around with a sliding ring 39, through which the pressing chamber 16 is closed by means of the seals 18, 36. A driver 40 is arranged on the sliding ring 29 and is connected to a piston rod 41. The piston rod 41 interacts with a displacement cylinder 42 which is fastened to the abutment 24.

In the sliding ring 39 a Schlammei inlet 43 is provided with a bore 44 through which sludge to be dewatered in the direction of arrow 45 is filled into the pressing chamber 16. The same applies to the press chamber 38.

The mode of operation of the high-pressure press filter designed according to the invention is as follows:

In the filling state of the high-pressure press filter shown in FIG. 1, that is to say with the piston rod 6 withdrawn, the compression chambers 16, 38 are closed by the displacement rings 39 because the piston rods 41 of the displacement cylinder 42 are extended and, via the catches 40 of the displacement rings, the latter are in the closed position of the compression chambers 16.38. In this state, the sludge to be dewatered is filled in the direction of the arrow 45 through the bore 44 of the sludge inlet 43 into the press chamber 16. When the bale chamber 16.38 is full, the Press cylinder 5 is set under operating pressure, which generates a filtration pressure of at least 100 bar in the press chamber. As a result, the piston rod 6 extends from the cylinder 5, as shown in FIG.

During the pressing and in the final pressing position shown in FIG. 2, filtrate flows from the pressing chamber 16, 38 through the filtrate openings 15, 20, 23, 30 and a filter cloth into the filtrate chambers 12, 27, 33 and from these filtrate chambers 12, 27 , 33 through the bores 13a, 26 and 34 of the filtrate outlets 13, 25 and the plate 2 in the direction of the arrows 14,28,34 to the outside.

When the sludge is pressed together to form a filter cake 46 that no longer releases filtrate, the piston rod 6 is withdrawn into the cylinder 5, so that the press chamber 16 assumes its original position. Then the piston rods 41 i n the cylinder 42 are retracted, so that the sliding rings 39 are also retracted and the press chamber 16 assumes the open position shown in FIG. 3, the filter cake falling out of the then open press chambers 16, 38.

Subsequently, the sliding rings 39 are shifted from the open position shown in FIG. 3 into the closed position illustrated in FIG. 1, so that in this position the press chambers 16, 38 can again be filled with sludge, as described in the introduction, which then follows the same method , as shown above, ie. is drained. Reference list

Plate 34 arrow plate 35 seal tie rod 36 seal tie rod 37 seal press cylinder 38 compression chamber piston rod 39 sliding ring piston 40 driver piston plate 41 piston rod surface 42 ^' displacement cylinder filter plate 43 sludge inlet axis 44 bore filter chamber 45 arrow filtrate outlet 46 filter cake a bore arrow filter opening compression chamber paragraph seal counter filter plate filter opening housing part Filter plate filter opening abutment filtrate outlet bore filtrate chamber arrow filter plate filtrate chamber housing part bore filtrate chamber

Claims

claims

1 . Filter press for press dewatering of sludge that is difficult to dewater

with a number of pressing bodies arranged in alignment in a row, which are designed as hollow cylinders and which consist of a spacing cylinder and two presses arranged at both ends of the spacing cylinder,

- with a pressing chamber between two adjacent pressing bodies,

- With a cylindrical sliding ring ^' each ^' baling chamber, with which the baling chamber is to be closed and opened, with an annular circumferential seal at both ends of the pressing body and

with devices for the hydraulic drive of the pressing bodies in the direction of their arrangement one behind the other, characterized in that

that a common hydraulic drive is provided for all pressing bodies,

- That each sliding ring has at least one filling opening and

- That each sliding ring is adjustable in the axial direction, so that the chamber volume can be changed.

2. Filter press according to claim 1, characterized in that a press cylinder is provided as a common drive for all pressing bodies, which is arranged on one plate of the frame.

3. A filter press according to claim 1 or 2, characterized in that at least one displacement cylinder is provided per displacement ring, which is arranged between the displacement ring and the associated pressing body.

4. Filter press according to one of the preceding claims, characterized in that the cylinder of the displacement cylinder on a bearing block of the press body and the piston rod are arranged on a bearing block of the sliding ring.

5. Filter press according to one of the preceding claims, characterized in that the press walls with a number of filtrate openings are provided with filter cloths and filter material in the form of a filter cloth are provided in the press chambers in front of the filtrate openings.

6. Fi lterpresse according to any one of the preceding claims, characterized in that at least one filling opening is provided for filling the open press chamber in the sliding ring.

7. Filter press according to one of the preceding claims, characterized in that a filtrate drain is provided in the pressing body.