GB2216031A - Rotary drum filter - Google Patents
Rotary drum filter Download PDFInfo
- Publication number
- GB2216031A GB2216031A GB8807389A GB8807389A GB2216031A GB 2216031 A GB2216031 A GB 2216031A GB 8807389 A GB8807389 A GB 8807389A GB 8807389 A GB8807389 A GB 8807389A GB 2216031 A GB2216031 A GB 2216031A
- Authority
- GB
- United Kingdom
- Prior art keywords
- liquid
- drum
- detecting
- rotary separator
- solids
- 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
- 239000007788 liquid Substances 0.000 claims abstract description 36
- 239000007787 solid Substances 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 238000004140 cleaning Methods 0.000 claims abstract description 3
- 230000003213 activating effect Effects 0.000 claims 1
- 239000007921 spray Substances 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
- B01D35/143—Filter condition indicators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/06—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums
- B01D33/11—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums arranged for outward flow filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/44—Regenerating the filter material in the filter
- B01D33/48—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
- B01D33/50—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/70—Filters with filtering elements which move during the filtering operation having feed or discharge devices
- B01D33/72—Filters with filtering elements which move during the filtering operation having feed or discharge devices for feeding
- B01D33/722—Filters with filtering elements which move during the filtering operation having feed or discharge devices for feeding containing fixed liquid displacement elements or cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/80—Accessories
- B01D33/804—Accessories integrally combined with devices for controlling the filtration
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
Abstract
A perforated filter drum 1 rotates about an inclined axis 2, a solids-liquid mixture is fed to the bottom end through duct 5 and drained solids are discharged at upper end outlet 8. Liquid draining through the drum wall is mainly collected in collector 10, but should the perforations in the lower part of the drum become blocked then more liquid will flow into upper collector 11. Such increased flow is detected by flowmeter 14, which gives a warning and may activate cleaning means such as external sprays. <IMAGE>
Description
A ROTARY SEPARATOR
This invention relates to a rotary separator for
separating solids/liquid mixtures.
It is well known to provide a rotary separator
of the kind comprising a perforated drum rotatable
about an axis inclined upwardly from an inlet for a
solids/liquid mixture to an outlet for solids from
which liquid has drained through the drum during
travel from the inlet to the outlet. The mixture may
be delivered to the inlet through a pipe penetrating t a closed lower end of the drum or through a pipe
extending axially through the drum and having a
discharge opening at the lower or inlet end of the
drum. Such a drum may have an internal screw
formation or other means for conveying the mixture
upwardly towards the outlet upon rotation of the
drum. The oversized solids are dried during such
travel by drainage of liquid through the drum
perforations into stationary collection means.
Additional drying means may be arranged within the
drum as described in Patent Appln. No. 87 22383.
A problem in such rotary separators is that the
drum perforations become blocked with solids material
in spite of the usual provision of a spray bar with
jet nozzles intermittently spraying liquid onto the
outside of the drum. If the perforations in the drum
become blocked liquid builds up in the drum until it
discharges with the solids at the open, outlet end of
the drum. It has previously been recognised that
prevention of such discharge of liquid at the solids
discharge point is reliant upon an early warning of
the fact that the drum perforations are becoming
blocked and the operating water level is rising.
There is available a range of mechanical, electrical, acoustic and light sensing devices for this purpose but all are prone to damage and/or malfunction owing to the unpredictable nature of the effluents sometimes being handled in the separators.
It is an object of the present invention to obviate or mitigate the aforesaid disadvantages by provision of a rotary separator in which early warning of blockage of the drum perforations is reliably given.
According to the present invention there is provided a rotary separator comprising a perforated rum rotatable about an axis inlined upwardly from an inlet for a solids/liquid mixture to an outlet for solids from which liquid has drained through the drum during travel from the inlet to the outlet, and collection means for collecting the drained liquid including first collection means for most of said liquid and second collection means in the vicinity of said outlet for receiving little or none of said liquid save when drainage into said first collection means is impeded by blockage of the drum perforations, and means for detecting an increased flow of liquid in said second collection means.
The invention will now be further described by way of example only with reference to the accompanying drawings which is a diagrammatic view from the side of one embodiment of rotary separator in accordance with the invention.
Referring now to the drawing, the exemplary separator comprises a perforated drum 1 rotatable about an axis 2 which is inclined upwardly from a lower inlet 3 adjacent a closed end 4. Extending along the axis 2 is a solids/liquid mixture feed pipe
S with a discharge opening 6 at the lower end of the drum 1. The drum 1 has an internal helical screw formation 7 which rotates with the drum to convey the mixture from the inlet to a solids outlet 8.
As thus far described the rotary separator is of well known design and it may have additional known or previously proposed features as indicated in the introduction above. The invention is concerned with the problem of blinding over or blockage of the drum perforations by the solids material in spite of the standard precautions that are taken against such an eventuality. Such blockages occur more frequently in the lower parts of the drum and the invention is based upon this realisation. In normal operation, with unblocked perforations, the solids discharged at the outlet 8 are fully separated from liquid which has drained through the drum during travel from the inlet to the outlet. The liquid level in the drum 1 will thus normally be below the level of the line L in the drawing and will drain into a first stationary collector 10 positioned below the drum.A second stationary collector 11 is provided immediately adjacent the collector 10 in the vicinity of the solids discharge outlet 8. The collector 11 is connected by a pipe 12 to a main discharge pipe 13 connected to the collector 10. In the pipe 12 is a flow meter 14 for measuring the rate of flow of liquid through the pipe 12.
In normal operation with the liquid level at or below the level L no or only a small amount of liquid is collected by the collector 11 since most of the liquid drains through the lower perforations of the drum into the main collector 10. When the lower drum perforations become blocked the liquid in the drum rises above the level L and the flow into the second collector 11 and hence the pipe 12 increases. This increase in the flow rate of the liquid in the pipe 12 is detected by the flow meter 14 and when an adjustable threshold value is reached a signal may be generated to arrest the separator and/or produce a visual or audible alarm. The signal can also be used to activate drum perforation cleaning devices such as high powered external sprays.
It will be appreciated that numerous modifications may be made without departing from the scope of the invention. For example, a plurality of first or second collectors may be provided as long as at least one second collector is disposed upstream of at least one first collector for normally receiving little or no drainage liquid but subject to an increased liquid flow as the drain perforations become blocked.
Claims (6)
1. A rotary separator comprising a perforated drum rotatable about an axis inclined upwardly from an inlet for a solids/liquid mixture to an outlet for solids from which liquid has drained through the drum during travel from the inlet to the outlet, and collection means for collecting the drained liquid including first collection means for most of said liquid and second collection means in the vicinity of said outlet for receiving little or none of said liquid save when drainage into said first collection means is impeded by blockage of the drum perforations, and means for detecting an increased flow of liquid in said second collection means.
2. A rotary separator according to claim 1, wherein the second collection means comprises a pipe through which liquid received by the second collection means is caused to flow, and the detecting means comprises a flowmeter for detecting the flow of liquid through the pipe.
3. A rotary separator according to claim 1 or 2, comprising means for indicating a colour condition in the event of the detecting means detecting a rate of flow greater than a threshold level.
4. A rotary separator according to claim 3, comprising means for adjusting the said threshold.
5. A rotary separator according to any preceding claim, comprising means for activating drum cleaning apparatus in response to the detecting means detecting said increased flow of liquid.
6. A rotary separator substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8807389A GB2216031B (en) | 1988-03-29 | 1988-03-29 | A rotary separator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8807389A GB2216031B (en) | 1988-03-29 | 1988-03-29 | A rotary separator |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8807389D0 GB8807389D0 (en) | 1988-05-05 |
| GB2216031A true GB2216031A (en) | 1989-10-04 |
| GB2216031B GB2216031B (en) | 1991-10-16 |
Family
ID=10634265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8807389A Expired - Fee Related GB2216031B (en) | 1988-03-29 | 1988-03-29 | A rotary separator |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2216031B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993017775A1 (en) * | 1992-03-06 | 1993-09-16 | Managed Pollution Systems Limited | Separator device |
| GB2297281B (en) * | 1993-10-21 | 1998-04-01 | Joseph Gardner | Slurry separator |
| WO2001076720A1 (en) * | 2000-04-07 | 2001-10-18 | Sb Rotashake As | Device for separating solids from a fluid mass |
| EP1236493A1 (en) * | 2001-02-26 | 2002-09-04 | Van Remmen UV techniek | Separating filter |
-
1988
- 1988-03-29 GB GB8807389A patent/GB2216031B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993017775A1 (en) * | 1992-03-06 | 1993-09-16 | Managed Pollution Systems Limited | Separator device |
| US5500114A (en) * | 1992-03-06 | 1996-03-19 | Managed Pollution Systems Limited | Separator device |
| GB2297281B (en) * | 1993-10-21 | 1998-04-01 | Joseph Gardner | Slurry separator |
| WO2001076720A1 (en) * | 2000-04-07 | 2001-10-18 | Sb Rotashake As | Device for separating solids from a fluid mass |
| EP1236493A1 (en) * | 2001-02-26 | 2002-09-04 | Van Remmen UV techniek | Separating filter |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8807389D0 (en) | 1988-05-05 |
| GB2216031B (en) | 1991-10-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19930329 |