DE2949520C2 - Device for the separation of gaseous and liquid components from thick sludge-like mixtures - Google Patents

Description

a) a horizontally arranged double-walled outer tube (2) with a passage opening having inner wall (4), which has a cylindrical first chamber (6) for receiving represents the gaseous and liquid components and at one end with a Feed device (12) for thick sludge and at the other end with a discharge device (18) for the thick sludge depleted in gaseous and liquid components is,

b) one arranged coaxially in an outer roller (2) Inner tube (20) with a jacket (21) having passage openings, the one represents a second chamber (26) for receiving the gaseous and liquid components,

c) with at least one first outlet line (30, 30 ', 30 ") for the gaseous and liquid Components which lead from the first chamber (6) into a storage container (34),

d) wherein the discharge device (18) consists of a horizontally flange-mounted on the discharge side There is a tube (50) which has an outlet opening (54) in the lower region, and

e) a counter-pressure piston (56) being guided in the tube (50) of the discharge device (18), whose end face (60) is beveled in the direction of the outlet opening (54) and on which a compression spring (58) engages, which biases against the thick sludge conveying direction exercises

characterized,

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f) that the second chamber (26) in the direction of the feed device (12) by a separating cone (22) and at the other end in the area of the discharge device (18) by a cover plate or a hemisphere (24) is closed,

g) that at least one second outlet line (40) for the gaseous and liquid components leads from the second chamber (26) into the storage container (34), and

h) that on the feed side between the feed device (12) and the separating cone (22) of the Inner tube (20) and on the discharge side in front of the discharge device (18) each have a gate valve (70.72) is provided.

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2. Apparatus according to claim 1, characterized in that around the jacket (21) of the inner tube (20) helical baffles (28) are arranged.

3. Apparatus according to claim 1 or 2, characterized in that both the first chamber (6) as well as the second chamber (26) for receiving the gaseous and liquid components either are connected directly or via the storage container (34) to a vacuum pump (38).

65 The invention relates to a device according to the preamble of claim 1. Such a device is already known from US Pat. No. 1,851,191

The known device, a thick sludge press, has a double-walled outer pipe with a line connection, a perforated inner tube with a screw and a perforated outlet cone as a counter-pressure piston on. By manual operation, the outlet cone is moved against the inner tube, so that the The outlet cross-section is changed and the pressure in the thick sludge can therefore be adjusted. A disadvantage of the known The device is based on the fact that the setting of the outlet cone has to be carried out by hand Furthermore, the entry of liquid into the inner tube is only dependent on the pressure of the thick sludge column and is nichi additionally supported by other measures.

The object of the invention is to design the known device flow-favorably and that for Separation of substances required to build up the pressure gradient faster.

To solve this problem are used in the characterizing Part of claim 1 specified features.

Advantageous refinements of the invention are the subject matter of the subclaims.

In the following an embodiment of the invention will be explained with reference to the drawing, which shows a partial section through the device including the schematically drawn additional units.

The device has a double-walled outer tube 2 with an outer wall 1 and an inner wall 4, the Inner wall 4 provided with passage openings and between inner wall 4 and outer wall 1 through Flanges 8, 14 closed first chamber 6 for receiving the liquid and gaseous components is formed. The outer tube 2 is connected via the flange 8 to a conical transition tube 10, which is in turn connected to the outlet pipe of a feed device 12. As a feeding device either a thick sludge pump or a screw conveyor can be provided.

At the other end, the double-walled outer tube 2 is connected via the flange 14 and a connecting tube 16 a discharge device 18 is connected.

In the double-walled outer tube 2, an inner tube 20 is arranged coaxially, its jacket 21 also Has openings and in its interior a second chamber 26 for receiving gaseous and forms liquid components. The inner tube 20 is in the direction of the feed side with a separating cone 22 provided, the wall of which also has openings. The end of the Inner tube 20 is closed with a hemispherical cover 24. In another version the cover is flat. Furthermore, the separating cone can also be designed without passage openings be.

A helical baffle 28 is arranged around the inner tube 20, which baffle plate 28 in the interior 19 between the inner pipe 20 and the inner wall 4 of the outer pipe 2 wraps thick sludge conveyed.

The inner tube 20 is in the outer tube 2 in any manner, for. B. by supports, flange rings and like that kept.

The first chamber 6 is via first outlet lines 30, 30 ', 30 "and via a collecting line 32 with a Reservoir 34 connected, which in turn via a line 36 with a vacuum pump 38 in connection stands. The second chamber 26 is analogous to a

Another outlet line 40, which starts at the lowest point of the chamber 26, with the collecting line 32 tied together. Between the individual lines and the collecting line 32 there are conventional shut-off valves 31, 31 ', 31 ″ and 41 are provided. Furthermore, both the first chamber 6 and the second chamber 26 are provided with a Pressure indicators 43 or 44 and provided with a shut-off valve, not shown. At any Rinse water supply and discharge lines can be provided. The flushing of the conical transition pipe 10 takes place through a flushing water supply line 42. The flushing water can through a near the flange 8 attached flush valve 45 drain. The connecting pipe 16 is flushed in a similar manner, by means of flushing inlet and flushing outlet valves upstream of the gate valve in the conveying direction 46 or 47.

The discharge device 18 consists of a tube 50, which is connected to the discharge end via a flange 52 the device or with the connecting pipe 16 is connected. In the lower area of the pipe 50 there is an outlet opening 54 for the dehydrated product. In the tube 50 is a Counter-pressure piston 56 which is pressed against the conveying direction under the pressure of a spring 58. the The end face 60 of the counter-pressure piston is beveled in the direction of the outlet opening 54.

Between the conical transition pipe 10 and the outlet pipe of the feed device 12 is a first Gate valve 70 is provided. Likewise, between the connecting pipe 16 and the pipe 50 is the Discharge device a second gate valve; 72 provided.

It should be noted that the first gate valve 30 is omitted in certain operating cases or can be arranged in the vicinity of a feed pump. In the first case, the consistency of the Thick sludge in order to create the pressure build-up required for dewatering. In the second case in which it does not depend on the consistency of the sludge, the gate valve 70 can be part of the feed pump or sit in another piece of pipe between the feed pump and thick sludge press.

Both the inner wall 4 of the outer tube 2 and the inner tube 20 including the separating cone 22 are provided with passage openings on the order of 3 to 10 mm and preferably 5 to 8 mm These areas provided with passage openings are different filter webs made of different Material arranged.

The method of operation of the device according to the invention will be explained in more detail below. A common one Sewage sludge with a dry matter content of 20% is closed via a thick sludge pump Gate valves 70 and 72 promoted, at the same time by means of the vacuum pump 38 a vacuum in the first and second chambers 6 and 26 is applied. After opening the first gate valve 70 the thick sludge reaches the with a pump pressure of 10 to 70 bar and preferably 20 to 60 bar

ίο Interior 19 between inner tube 20 and outer tube 2. The thick sludge is past the separating cone 22 of the inner tube 20 and between the inner wall 4 of the outer tube 2 and the jacket 21 of the inner tube 20, with liquid and gaseous constituents get through the perforations into the first and second chambers 6 and 26, respectively. At the same time, the Thick sludge circulated through the helical baffles 28, so that the less dehydrated middle Components of the sludge also with the outer surface of the inner tube covered by the filter layers or the inner wall of the outer tube 2 come into contact. Located in chambers 6 and 26 accumulating liquid and gaseous components are via the relevant outlet lines 30,30 ', 30 "and 40 and the collecting line 32 withdrawn into the storage container 34. When the thick sludge reaches the second gate valve 72 on the discharge side, this is opened, whereupon the dewatered thick sludge continues to move to the inclined face 60 of the counter-pressure piston 56, the preferably by means of the spring 58 a counterforce of 1000 to 3000 kp and preferably 1500 to 3000 kρ exercises. As the pressure builds up, the opposing piston is gradually pushed back and releases the Outlet opening 54 for the dehydrated product free.

After this start-up phase, the device continues to work. If the Pressure on the counter-pressure piston 56, for. B. by increased discharge of liquid or gaseous Components, the outlet opening 54 is closed again until there is sufficient pressure in the Device forms again and more dehydrated product can escape.

To clean the filter layers, rinse water or withdrawn liquid product can be reversed Direction from inside the first chamber 6 or from inside the second chamber 26 through the Feed layers are pressed out for cleaning, the first gate valve being expediently first 70 is closed.

1 sheet of drawings

Claims (1)

Claims: ίο 15 20 1. Device for the separation of gaseous and liquid components from thick sludge-like Mixtures, with