GB2052290A - Filter installation and process for operating the same - Google Patents
Filter installation and process for operating the same Download PDFInfo
- Publication number
- GB2052290A GB2052290A GB8019085A GB8019085A GB2052290A GB 2052290 A GB2052290 A GB 2052290A GB 8019085 A GB8019085 A GB 8019085A GB 8019085 A GB8019085 A GB 8019085A GB 2052290 A GB2052290 A GB 2052290A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filter
- suction
- feeding
- filter belt
- belt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000009434 installation Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims description 26
- 239000007788 liquid Substances 0.000 claims abstract description 21
- 239000008247 solid mixture Substances 0.000 claims abstract description 10
- 239000012530 fluid Substances 0.000 claims description 41
- 239000000203 mixture Substances 0.000 claims description 14
- 238000000151 deposition Methods 0.000 claims description 8
- 238000009877 rendering Methods 0.000 claims description 4
- 230000001960 triggered effect Effects 0.000 claims description 4
- 239000007787 solid Substances 0.000 description 10
- 239000000725 suspension Substances 0.000 description 9
- 239000000706 filtrate Substances 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/09—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with filtering bands, e.g. movable between filtering operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/60—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
- B01D29/6438—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/76—Handling the filter cake in the filter for purposes other than for regenerating
- B01D29/78—Handling the filter cake in the filter for purposes other than for regenerating for washing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/20—Pressure-related systems for filters
- B01D2201/204—Systems for applying vacuum to filters
Abstract
A filter installation comprises: a filter belt (10) which is moved intermittently through at least one treatment station (46,52,58) and which is otherwise stationary. A feed device (40) feeds a liquid/solid mixture onto the filter belt. Suction chambers 12a to 12e are disposed below the filter belt, the suction being rendered inoperative during the period of forward movement. The belt movement, application of suction and feed valves (42 to 60) are controlled by timing devices according to a predetermined programme. <IMAGE>
Description
SPECIFICATION
Filter installation and process for operating the same
This invention relates to filter installations and to processes for operating the same.
German Offenlegungsschrift No. 2349215 discloses a filter installation comprising a filter belt, which can be moved during a period of forward movement through at least one treatment station and which is stationary during a total active period, at least one device for feeding a medium onto the filter belt an at least one suction device below the filter belt, the suction being switched off during the period of forward movement.
In this known filter installation, a device for feeding a liquidisolid suspension to be filtered and a device for feeding a treatment fluid to treat the solids deposited on the filter belt run continuously. Thus the known filter installation can be regarded as a continuously working installation.
In discontinuously working filter installations, it is known to open and to close various feed devices as well as suction devices one after the other at selected points in time, a certain operation then taking place simultaneously in the entire filter in each case; in contrast to the conditions in continuous filter installations, continuous streams of liquid/solid suspension, treatment fluid and filtrates are then not obtained. On the other hand, this has the advantage that the treatment times can be selected to have any desired length.
The present invention seeks to provide a filter installation which combines the advantages of known continuous and discontinuous filter installations and largely avoids their disadvantages.
According to one aspect of the present invention there is provided a filter installation comprising: a filter belt which can be moved during a period of forward movement through at least one treatment station and which is stationary during a total active period; feeding meansforfeeding a medium onto the filter belt; suction means below the filter belt, the suction being rendered inoperative during the period of forward movement; and control means for predetermining the start and,or end of the period of forward movement and'or the start and or end of the period the suction means are rendered operative.
Preferably, the said control means comprises at least one timing device, the start of which is, in operation, triggered by the start of the total active period. If several active periods within the total active period have to be separated from one another by switching procedures, the control means may comprise at least two timing devices arranged so that the start of operation of the second timing device is triggered by the end of operation of the first timing device.
Each timing device can of course trigger several switching procedures, for example switching of valves in the feed means and switching of valves in the suction means.
According to another aspect of the present invention there is provided a process for operating a filter
installation as recited above in which said feeding
means comprises a first feed device for depositing a
liquid/solid mixture on the filter belt and at least one
second feed device, downstream of the first feed
device in the direction of movement of the filter belt, for feeding a treatment fluid to treat the mixture
deposited on the filter belt, the process including terminating feeding of the said mixture and/or the treatment fluid before the end of the total active time, whilst continuing maintaining suction until the end of the total active period.This process for operation can be considered a "dry feed-forward"
operation, because since the charging of the liquid/ solid mixture and/or of the treatment fluid is ended,
before the total active period ends and while suction still continues, it is ensured that, at the start of the subsequent period of forward movement of the filter belt, there is no puddle of liquid remaining on the filter belt. Such a puddle would move in an uncontrolled manner on acceleration or deceleration of the filter belt and would pass into zones of the filter belt, where it is not desired. Moreover, this operation
prevents a puddle of liquid from being transported
into the zone of a further device for feeding treatment fluid and the further treatment fluid from then being mixed with the puddle still present in this zone.This mixing would result in the efficiency of the treatment being reduced and in the filtrates no longer being separated from one another in the desired manner.
According to a further aspect of the present invention there is provided a process for operating a filter installation as recited above in which said first feeding means comprises a first feed device for depositing a liquid/solid mixture on the feed belt and at least one second feed device, downstream of the first feed device in the direction of movement of the filter belt, for feeding a treatment fluid to treat the mixture deposited on the filter belt, the process including rendering said suction means operative after the start of the total active period. This process ensures - provided that addition of the mixture is ended before the start of suction - that the mixture can be distributed more uniformly before the start of suction.Ending of the feed of treatment fluid before the start of suction ensures a longer time of action of the treatment fluid on the deposited solids, for the sake of better utilisation of a given total volume of treatment fluid.
According to yet another aspect of the present invention there is provided a process for operating a filter installation as recited above in which said feeding means comprises a first feed device for depositing a liquid/solid mixture on the feed belt and at least one second feed device, downstream of the first feed device in the direction of movement of the filter belt, for feeding a treatment fluid to treat the mixture deposited on the filter belt, the process including applying different treatment fluids sequentially to the mixture deposited on the filter belt.
According to a still further aspect of the present invention there is provided a process for operating a filter installation as recited above in which said feeding means comprises a first feed device for depositing a liquid/solid mixture on the feed belt and at least one second feed device, downstream of the first feed device in the direction of movement of the filter belt, for feeding a treatment fluid to treat the mixture deposited on the filter belt the process including introducing the treatment fluid, rendering the said at least one suction device operative with a time delay after the end of the introduction of the treatment fluid and further introducing the same or a different treatment fluid a further time delay after the said suction means have been rendered operative but whilst said suction means is operative.The result of this operation is that the treatment fluid from the first treatment, which has been enriched with foreign substances during the treatment period, is replaced by fresh treatment fluid shortly before the next period of forward movement.
The invention is illustrated, merely byway of example, in the accompanying drawings, in which:
Figure 1 is a schematic diagam of one embodiment of a filter installation according to the present invention; and
Figure 2 illustrates operation of a filter installation according to the present invention.
Referring first to Figure 1, afilterinstallation according to the present invention has a continuous filter belt 10. An upper run of the filter belt 10 runs over a plurality of suction boxes 1 2a, 1 2b, 1 2c, 126, 12e, which are located one after the other in the direction of forward (orfeeding) movement of the filter belt. Each of these suction boxes is connected via a respective line 14a to 14dto a respective separator 16a to 166. The separators 16a to 16d are connected to a common vacuum line 18 which is connected to a vacuum pump 20. Filtrate outlet lines 22a to 22d are connected to separators 16a to 16d respectively.In the lines 14a to 146, there are shut-off valves 24a to 24d respectively which make it possible to interrupt selectively the suction effect on the suction boxes 12a to 12e. Further valves 26a to 26d serve to vent the lines 1 4a to 1 4d respectively and hence the suction boxes 12a to 12e.
The filter belt 10 is discontinuously moveable in a direction of forward movement indicated by an arrow 28. The discontinuous movement of the belt 10 is effected by moving a deflection roller 30 from the position shown in solid lines into a position shown by broken lines, whilst the lower section of the filter belt is engaged by a brake 32. During feeding of the filter belt 10, the suction boxes 12a to 12e are vented so that they do not have any braking effect on the filter belt 10. To balance the movement of the roller 30, a further mobile deflection roller 34 is provided between two fixed deflection rollers 36 and 38. When the deflection roller 30 moves from the left to the right as shown in Figure 1, the deflection roller 34 moves leftward from the position shown in solid lines to the position shown in broken lines.After the end of the movement in the forward direction and when the suction boxes 12a to 12e are again under a vacuum, the brake 32 is released and the deflection roller 34 is moved from the left to the right by means of a pneumatic cylinder (not shown), the deflection roller 30 moving from the right to the left under the action of a pneumatic cylinder (not shown).
A feed device 40 for feeding a liquid solid suspension is fitted above the upper section of the filter belt 10; this device comprises a valve 42 and a distributor device 44. In the direction of forward movement of the filter belt the device 40 is followed by a device 46 which feeds a first treatment medium and has a shut-off valve 48 and a distributor device 50. The device 46 is followed in the direction of forward movement of the filter belt by a device 52 which feeds a further treatment medium and has a shut-off valve 54 and a distributor device 56. The device 52 is followed in the direction of forward movement by a feed device 58 which has a shut-off valve 60 and a distributor nozzle 62.
The lower run of the filter belt 10 passes through a washing chamber 64 provided with a feed line 66 for washing fluid and an outlet line 68 for washing fluid.
A shut-off valve 70 is provided in the line 66, which communicates with a washing nozzle 72.
The shut-off valves 24a to 24d, the vent valves 26a to 26d and the feed valves 42,48,54 and 60 are controlled by a timing device. This timing device can be coupled to a timing device which controls the periods of forward movement and stationary periods of the filter belt 10. The timing device obtains a first trigger pulse from a device controlling forward movement of the filter belt, when the forward movement begins. The subsequent switching times of the individual valves are then fixed by one or more other timing devices, the total running time of these timing devices one after the other corresponding to the cycle of the device for controlling movement of the filter belt; that is to say the periods of forward movement and the stationary periods of the filter belt 10.
Figure 2 shows at A a typical process for operating the filter installation of Figure 1. A liquid/solid suspension is continuously fed through the feed device 40 (upper line). Treatment fluid is continuously fed through the feed device 46 (also upper line).
Suction is interrupted only during the period of forward movement, so that the filter belt can easily be moved; the suction device is active during the total active period (lower line).
Line B illustrates one mode of operating a filter installation according to the present invention. The device 40 for feeding the liquid/solid suspension is open during the period of forward movement and during a part of the total active period (active periods 1 and 2). During the same time, the feed device 46 and, if appropriate, the feed devices 52,58 for treatment fluid are also open (upper line). As shown by the lower line, suction is active during the total active period. It will be appreciated that, after the end of active period 2, it is still possible during active period 3 to remove, by suction, liquid which may have been formed on the filter belt.
Line C illustrates another mode of operating a filter installation according to the present invention. Feeding of the liquid, solid suspension through the feed device 40 and feeding of the treatment fluid through the feed device 46 and, if appropriate, through the further feed devices 52,58 take place only during the period of forward movement (upper line). It is also conceivable, however, that feeding of the liquid/solid suspension takes place during the entire cycle time and only feeding of treatment fluid is restricted to the period of forward movement (upper line). The essential point is that suction only starts at the end of active period 1, so that the quantity of treatment fluid, applied during the period of forward movement, is utilised in an optimum manner.
Line D illustrates yet another mode of operating a filter installation according to the present invention in which the liquid/solid suspension and treatment fluid are introduced only during the period of forward movement although the liquid/solid suspension can be introduced during the entire cycle time.
Suction takes place during the total active time.
During active period 2,further treatment fluid of a different type is introduced, as indicated by hatching in the upper line. This can be effected with the aid of a valve 60 which is designed as a change-over valve and which allows successive feeding of different treatment fluids. The separation of filtrate on the suction side can likewise be effected by means of change-over valves, in plane of the valve 24d. A yet further mode of operating a filter installation according to the present invention is illustrated by line E.
Treatment fluid is initially introduced during the period of forward movement, suction is applied after the active period 1 and, after active period 2, further treatment fluid is introduced.
The feed device 58 distributes over a relatively large area, for introducing treatment fluid during the active period and the period of forward movement as the case may be. The feed devices 40,46 and 52 can likewise be designed for distribution over a relatively large area. Alternatively the feed devices may be arranged so that they deliver only along a line which runs transversely to the direction of the arrow 28. With this arrangement, the feed devices are active either during the period of forward movement or, if they are intended to be active during the total active time, they can be movable to and fro in a direction parallel to the arrow 28, as indicated by the double arrow 76.
The modes of operation indicated by lines A to E in
Figure 2 can also be combined with one another, for example, in such a way that certain feed devices always work according to one line and others work according to another line.
The control system is freely programmable: this means on the one hand that the active periods can be mutually determined in various ways and, on the other hand, that the different programmes according to lines A to E can be applied as desired to the various feed devices and suction devices.
Claims (12)
1. A filter installation comprising: a filter belt which can be moved during a period of forward movement through at least one treatment station and which is stationary during a total active period; feeding means for feeding a medium onto the filter belt; suction means below the filter belt, the suction being rendered inoperative during the period of forward movement; and control means for predetermining the start and/or end of the period of forward movement and/or the start and/or end of the period the suction means are rendered operative.
2. A filter installation as claimed in claim 1 in which said control means comprises at least one timing device, the start of which is, in operation, triggered by the start of the total active period.
3. A filter installation as claimed in claim 2 in which the control means comprises at least two timing devices arranged so that the start of operation of the second timing device is triggered by the end of operation of the first timing device.
4. Afilter installation as claimed in any preceding claim in which said control means are such that said feeding means and/or said suction means can be switched over to different programmes during operation of the filter installation.
5. A process for operating a filter installation as claimed in any preceding claim in which said feeding means comprises a first feed device for depositing a liquid/solid mixture on the filter belt and at least one second feed device, downstream of the first feed device in the direction of movement of the filter belt, for feeding a treatment fluid to treat the mixture deposited on the filter belt, the process including terminating feeding of the said mixture and /or the treatment fluid before the end of the total active time, whilst continuing maintaining suction until the end of the total active period.
6. A process for operating a filter installation as claimed in any preceding claim in which said first feeding means comprises a first feed device for depositing a liquid/solid mixture on the feed belt and at least one second feed device, downstream of the first feed device in the direction of movement of the filter belt, for feeding a treatment fluid to treat the mixture deposited on the filter belt, the process including rendering said suction means operative after the start of the total active period.
7. A process as claimed in claim 5 in which the first feed device is rendered inoperative before said suction means is rendered operative.
8. A process for operating a filter installation as claimed in any preceding claim in which said feeding means comprises a first feed device for depositing a liquid/solid mixture on the feed belt and at least one second feed device, downstream of the first feed device in the direction of movement of the filter belt, for feeding a treatment fluid to treat the mixture deposited on the filter belt, the process including applying different treatment fluids, sequentially to the mixture deposited on the filter belt.
9. A process for operating a filter installation as claimed in any preceding claim in which said feeding means comprises a first feed device for depositing a liquid/solid mixture on the feed belt and at least one second feed device, downstream of the first feed device in the direction of movement of the filter belt, for feeding a treatment fluid to treat the mixture deposited on the filter belt the process including introducing the treatment fluid rendering the said at least one suction device operative with a time delay after the end of the introduction of the treatment fluid and further introducing the same or a different treatment fluid a further time delay after the said suction means has been rendered operative but whilst said suction means is operative.
10. A filter installation substantially as'herein described with reference to and as shown in Figure 1 of the accompanying drawings.
11. A process for operating a filter installation substantially as herein described with reference to
Figure 2 of the accompanying drawings.
12. Filter installation comprising a filter belt, which can be moved during a feed-forward time through at least one treatment station and is at a standstill during a total active time, at least one device for feeding a medium above the filter belt and at least one suction device below the filter belt, the suction being switched off during the feed-forward time, characterised in that the start and/or the end of feeding by the feed device and/or of suction can be freely selected throughout the total active time.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792924277 DE2924277A1 (en) | 1979-06-15 | 1979-06-15 | FILTER SYSTEM AND OPERATING METHOD FOR THIS FILTER SYSTEM |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2052290A true GB2052290A (en) | 1981-01-28 |
| GB2052290B GB2052290B (en) | 1983-08-03 |
Family
ID=6073335
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8019085A Expired GB2052290B (en) | 1979-06-15 | 1980-06-11 | Filter installation and process for operating the same |
Country Status (5)
| Country | Link |
|---|---|
| CH (1) | CH648766A5 (en) |
| DE (1) | DE2924277A1 (en) |
| FR (1) | FR2459069B1 (en) |
| GB (1) | GB2052290B (en) |
| NL (1) | NL186221C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4851113A (en) * | 1985-02-19 | 1989-07-25 | Delfilt Limited | Filter apparatus for slurry |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3232745A1 (en) * | 1981-10-31 | 1983-05-11 | Henri Gerhard Willem Bozeat Wellingborough Northamptonshire Pierson | Vacuum belt filter |
| DE3444475A1 (en) * | 1984-12-06 | 1986-06-12 | Fried. Krupp Gmbh, 4300 Essen | Process and apparatus for the dry fractionation of fats and oils |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1224706B (en) * | 1964-04-16 | 1966-09-15 | Metallgesellschaft Ag | Method and device for regulating the operation of belt filters |
| US3333693A (en) * | 1964-11-13 | 1967-08-01 | Hirs Gene | Filtering method and apparatus |
| DE1295518B (en) * | 1965-12-04 | 1969-05-22 | Sack Gmbh Maschf | Band filter |
| US3499533A (en) * | 1968-11-19 | 1970-03-10 | American Nat Bank & Trust | Automatically cleaned,pivotable,filter assembly |
| US3731808A (en) * | 1971-04-07 | 1973-05-08 | S Rickert | Filter apparatus |
| NL7210541A (en) * | 1972-08-01 | 1974-02-05 | ||
| US3814688A (en) * | 1972-08-30 | 1974-06-04 | Hydromation Filter Co | Liquid filter apparatus |
| DE2552741A1 (en) * | 1975-11-25 | 1977-05-26 | Peter Anthony Miller | Batch operated vacuum band filter - having cycle controlled by limiting reduced pressure in hook |
| CH613127A5 (en) * | 1976-10-05 | 1979-09-14 | Ciba Geigy Ag | |
| DE2720178B1 (en) * | 1977-05-05 | 1978-06-01 | Klein Alb Kg | Method and device for discontinuous filtering of suspensions |
| GB2092906A (en) * | 1981-02-18 | 1982-08-25 | Pierson Henri G W | Vacuum belt filter |
-
1979
- 1979-06-15 DE DE19792924277 patent/DE2924277A1/en active Granted
-
1980
- 1980-06-11 GB GB8019085A patent/GB2052290B/en not_active Expired
- 1980-06-11 CH CH4500/80A patent/CH648766A5/en not_active IP Right Cessation
- 1980-06-12 NL NLAANVRAGE8003416,A patent/NL186221C/en not_active IP Right Cessation
- 1980-06-12 FR FR8013469A patent/FR2459069B1/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4851113A (en) * | 1985-02-19 | 1989-07-25 | Delfilt Limited | Filter apparatus for slurry |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2459069B1 (en) | 1985-11-08 |
| DE2924277C2 (en) | 1987-05-07 |
| NL8003416A (en) | 1980-12-17 |
| NL186221C (en) | 1990-10-16 |
| NL186221B (en) | 1990-05-16 |
| CH648766A5 (en) | 1985-04-15 |
| FR2459069A1 (en) | 1981-01-09 |
| DE2924277A1 (en) | 1980-12-18 |
| GB2052290B (en) | 1983-08-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19950611 |