GB2184035A - Filter apparatus - Google Patents

Filter apparatus Download PDF

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Publication number
GB2184035A
GB2184035A GB08531042A GB8531042A GB2184035A GB 2184035 A GB2184035 A GB 2184035A GB 08531042 A GB08531042 A GB 08531042A GB 8531042 A GB8531042 A GB 8531042A GB 2184035 A GB2184035 A GB 2184035A
Authority
GB
United Kingdom
Prior art keywords
filter
unit
units
fluid
outlet
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.)
Withdrawn
Application number
GB08531042A
Other versions
GB8531042D0 (en
Inventor
James William Clarke
Robert Furley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Coal Industry Patents Ltd
Original Assignee
Coal Industry Patents Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Coal Industry Patents Ltd filed Critical Coal Industry Patents Ltd
Priority to GB08531042A priority Critical patent/GB2184035A/en
Publication of GB8531042D0 publication Critical patent/GB8531042D0/en
Publication of GB2184035A publication Critical patent/GB2184035A/en
Withdrawn legal-status Critical Current

Links

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
    • B01D29/01—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 flat filtering elements
    • 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
    • B01D29/50—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 multiple filtering elements, characterised by their mutual disposition
    • B01D29/52—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 multiple filtering elements, characterised by their mutual disposition in parallel connection
    • B01D29/54—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 multiple filtering elements, characterised by their mutual disposition in parallel connection arranged concentrically or coaxially
    • 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
    • B01D29/606—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 by pressure measuring
    • 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
    • B01D29/6469—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers
    • B01D29/6476—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers with a rotary movement with respect to the filtering element
    • 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
    • B01D29/6469—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers
    • B01D29/6484—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers with a translatory movement with respect to the filtering element
    • 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
    • B01D29/70—Regenerating the filter material in the filter by forces created by movement of the filter element
    • 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
    • B01D29/96—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor in which the filtering elements are moved between filtering operations; Particular measures for removing or replacing the filtering elements; Transport systems for filters
    • 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
    • B01D33/15—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces
    • B01D33/17—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces with rotary filtering tables
    • B01D33/19—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces with rotary filtering tables the table surface being divided in successively tilted sectors or cells, e.g. for discharging the filter cake
    • 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
    • B01D33/46—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element
    • 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
    • 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
    • B01D33/58—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element
    • B01D33/62—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying
    • B01D33/66—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying by gases or by heating

Abstract

A filfter apparatus comprises an intermittently rotating turntable 4 which carries a number of filter units 5, having filter screens 8, successively into communication with a similar number of fixed stations, where each filter unit is precoated and then supplied with sample slurry to be filtered, wash fluid etc., after which the unit is tilted to discharge cake and cleaned. The unit may then be tested, and if it is found defective the computer control can inhibit any subsequent supply of fluids thereto, though leaving the defective unit on the turntable. The control can also suspend one or more units from a particular step, such as the precoating step. The apparatus is used to assess the suitability of filter screens for particular slurries and filtering conditions. <IMAGE>

Description

SPECIFICATION Filter apparatus The present invention concerns filter apparatus, and more specially it concerns an apparatus for testing filter screens over many cycles.
Laboratory and pilot plant testing of filter screens for assessment for suitability for particular filtration conditions and slurries is well -known, but cannot easily give an indication as to performance over many cycles. That is, long term performance testing of filter screens has not previously been achieved, and in some cases at least, testing has been effectively carried out on the filtration plant, at considerable cost and with the risk of investment in expensive filter screens which are found unsatisfactory.
We have now devised an apparatus capable of long term testing of filter screens, which lends itself to automated operation and thus is capable of unattended operation.
The present invention provides a filter apparatus comprising a bed carrying a plurality of filter units each of which units has an inlet and an outlet and a filter screen mounted within each unit between said inlet and outlet, a plurality of fluid connection points capable of connecting with a said inlet or outlet and capable of supplying fluid to and removing fluid from a filter unit, and means for moving the filter units or the fluid connection points with respect to the other to enable each filter unit inlet or outlet to be connected to a differ ent fluid connection point on each movement.
Preferably, the bed is a rotatable bed and more preferably the means for moving is a motor driven indexing machine capable of ac curate registration of the position of filter unit inlets and outlets and the fluid connection points. However, the apparatus could be con structed with connection points moving with respect to the filter units.
Preferably, the apparatus incorporates fluid connection points capable of supplying precoat slurry, sample filtrable slurry and wash fluid, and preferably also a point capable of drying, eg. vacuum drying, a filter screen after washing, and a point capable of discharging the filter cake. Optionally, a further point for testing a filter screen after a complete filtration cycle is included. Desirably, the point for discharging filter cake uses the same or a sim ilar discharge method as the intended filtration installation, whether this is mechanical scrap ing, impact or vibration or back wash.
A preferred apparatus according to the in vention comprises six filter units on a rotata ble bed, and six points, one for each of the test cycle parts, namely pre-coat, filter, wash, dry, discharge and test. It is self evident that the filter units and the points are evenly spaced apart, to enable sequential connection to be made as the rotatable bed moves through the test cycle. The test cycle need not be the same for each filter unit, and desirably the apparatus permits variation in the test cycle.
The filter units may be provided with heating and/or cooling means in order to provide the same conditions for filtration as to be expected in a full scale installation. In one embodiment, each filter unit comprises a rotatable block in which the filter screen is mounted to facilitate discharge of the filter cake.
Preferably, the apparatus is provided with means for identifying a "failed" filter screen i.e. no longer operable, whether failure is due to screen rupture or blinding, from the "test" point or by monitoring filtration rate, and for preventing the failed filter from going through the test cycle. Most preferably, the test operation is under software control, in which the test conditions and parameters are controlled and recorded, the connection and disengagement of fluid connectors and operation of other points may also be under software control. Desirably, each point which utilises pressurised fluid, eg. pre-coat, filter etc, is provided with one or more leak detectors which are preferably connected to an alarm and automatic shut-down facility.
The invention will now be described with reference to the accompanying drawing which is a cross section of one embodiment of a filter apparatus according to the invention.
The apparatus is mounted on a wheeled frame, 1, which supports a commercial precision machine tool indexing machine, 2, which is controlled to perform a 60 rotation by a microcomputer (not shown). A steel tube, 3, is mounted on the indexing machine and transmits the rotational movement to a double-deck bed, 4. Mounted at the periphery of the bed are six filter units, 5, each having an inlet, 6, and an outlet, 7, (although the "outlet" may be used to admit fluid, and the "inlet" may be used to remove fluid, from the filter unit). Each filter unit has a disc, 8, of the filter screen material to be evaluated mounted within a rotatable bearing, 9. An external actuation rod, 10, is connected to the bearing to permit a 1800 reversal of the filter disc and bearing.Additionally, each filter unit is fitted with a heater (not shown) to reproduce full scale filtration conditions where necessary.
Mounted on the frame are six points, two of which are shown, 11a and 11b. Point lia is the "filter" point, and slurry to be filtered is pumped into line, 12 which has a fluid connector, 13, capable of locking connection with the inlet, 6, of the filter unit. A fluid connector, 14, capable of locking connection with the outlet, 7, of the filter unit, is mounted below the bed and is capable of being brought into and out of engagement by a pneumatically operated lever arrangement, 15.
The connector, 14, is connected to a line generally indicated by, 16, for removal of fil trate. The fluid connector, 13, has a trigger, 17, for releasing the locking mechanism, and a pneumatic actuator, 18, is mounted on the frame so as to release the lock before each disengagement of the fluid connectors and each rotation of the bed.
Point 1 ib is the filter cake discharge point.
A filter reverser unit, 19, comprising a controlled motor unit, 20, and a friction socket, 21, the socket being capable of being advanced into contact with the rod 10, is capable of reversing the position of the filter to facilitate discharge, and of returning the filter to its normal position before the filter unit is moved to the next point (the reversed position is shown). Point 1 1b incorporates an advancing filter cake scraper, 22, mounted so that it may be advanced into contact with the filter cake and rotated to break up the cake.
A chute 23 is used to carry particles of cake to a collection vessel (not shown), and a compressed air line, 24, connected to the outlet of the reversed filter unit, is effective to assist in back-washing the filter cake from the screen.
A pneumatic ram, 25, acts to raise or lower a plate, 26, which carries slurry feed, test gas and vacuum pipes.
In operation, under the control of a microcomputer, each of the six filter units can be operated simultaneously but under independent control as a separate stage of the filtration cycle. Each filter unit is controlled independently, so that the required operation, eg.
wash, is carried out under the appropriate conditions and for the correct time; when all operations have been terminated, the connections are broken and the bed is rotated to the next point. The system permits a stage, eg pre-coat, to be omitted from the filter cycle for any one or for all filter units and further permits the identification of a filter unit that ought to be withdrawn from use, because of filter screen rupture or blinding, for example, and permits it to rotate with the other units on the bed but not be in operation (the flow to such a filter unit being prevented by a pneumatically operated valve (not shown) in the feed line, under computer control).
Preferably, the apparatus comprises sensors of various types to ensure that all mechanical operations are working appropriately, and to monitor temperatures, pressures, leaks etc, to operate an alarm or a system shut down.
Tests with a prototype have successfully proven the apparatus and system design, and has given useful information on the filtration of coal extracts.

Claims (1)

1. A filter apparatus comprising a bed carrying a plurality of filter units each of which units has an inlet and an outlet and a filter screen mounted within each unit between said inlet and outlet, a plurality of fluid connection points capable of connecting with a said inlet or outlet and capable of supplying fluid to and removing fluid from a filter unit, and means for moving the filter units or the fluid connection points with respect to each other to enable each filter unit inlet or outlet to be connected to a different fluid connection point on each movement.
2. An apparatus according to claim 2, wherein an indexing machine is used to rotate the bed.
4. An apparatus according to any one of the preceding claims, comprising fluid connection points capable of supplying filter pre-coat slurry, sample filtrable slurry and wash fluid.
5. An apparatus according to claim 4, comprising a further point capable of drying a filter screen after washing and a further point for discharge of filter cake and optionally a filter test point.
6. An apparatus according to any one of the preceding claims, wherein each filter screen in a filter unit is mounted in a rotatable block.
7. An apparatus according to any one of the preceding claims comprising means for identifying a filter screen which is no longer operable and for preventing such filter screen from going through a cycle of operation.
8. An apparatus according to any one of the preceding claims, comprising a microcomputer control facility for substantially each part of a cycle of operation.
9. An apparatus according to claim 1, substantially as hereinbefore described with reference to the drawing.
GB08531042A 1985-12-17 1985-12-17 Filter apparatus Withdrawn GB2184035A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08531042A GB2184035A (en) 1985-12-17 1985-12-17 Filter apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08531042A GB2184035A (en) 1985-12-17 1985-12-17 Filter apparatus

Publications (2)

Publication Number Publication Date
GB8531042D0 GB8531042D0 (en) 1986-01-29
GB2184035A true GB2184035A (en) 1987-06-17

Family

ID=10589884

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08531042A Withdrawn GB2184035A (en) 1985-12-17 1985-12-17 Filter apparatus

Country Status (1)

Country Link
GB (1) GB2184035A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0724145A2 (en) * 1995-01-26 1996-07-31 Koei Industry Co., Ltd. Process and apparatus for filtrate measurement
WO1998023362A1 (en) * 1996-11-25 1998-06-04 Pannevis B.V. Apparatus for semi-continuous separation of a suspension
EP0925904A1 (en) * 1997-12-23 1999-06-30 BACHER, Helmut Method and device for changing the screen of a filtering apparatus

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112811653B (en) * 2020-12-29 2022-07-12 贵州鑫立方环保科技有限公司 Sewage purification device
CN113816528B (en) * 2021-10-07 2023-04-28 浙江宏电环保股份有限公司 Water treatment equipment with filtering and collecting device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB674377A (en) * 1949-03-21 1952-06-25 Bataafsche Petroleum Filtering apparatus with trays adapted to be tipped about a horizontal axis
GB1088700A (en) * 1965-05-12 1967-10-25 Parmentier Alfred H Process and apparatus for continuous rotating filter of large filtration area
GB1107588A (en) * 1965-05-25 1968-03-27 Centrala Automationslaboratori Automatic filter for liquids
GB1499120A (en) * 1974-12-16 1978-01-25 Bird Machine Co Filter
GB1565382A (en) * 1975-10-09 1980-04-23 Prayon Cell filters

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB674377A (en) * 1949-03-21 1952-06-25 Bataafsche Petroleum Filtering apparatus with trays adapted to be tipped about a horizontal axis
GB1088700A (en) * 1965-05-12 1967-10-25 Parmentier Alfred H Process and apparatus for continuous rotating filter of large filtration area
GB1107588A (en) * 1965-05-25 1968-03-27 Centrala Automationslaboratori Automatic filter for liquids
GB1499120A (en) * 1974-12-16 1978-01-25 Bird Machine Co Filter
GB1565382A (en) * 1975-10-09 1980-04-23 Prayon Cell filters

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0724145A2 (en) * 1995-01-26 1996-07-31 Koei Industry Co., Ltd. Process and apparatus for filtrate measurement
EP0724145A3 (en) * 1995-01-26 1998-02-25 Koei Industry Co., Ltd. Process and apparatus for filtrate measurement
WO1998023362A1 (en) * 1996-11-25 1998-06-04 Pannevis B.V. Apparatus for semi-continuous separation of a suspension
NL1004609C2 (en) * 1996-11-25 1998-06-05 Pannevis Bv Separation device.
EP0925904A1 (en) * 1997-12-23 1999-06-30 BACHER, Helmut Method and device for changing the screen of a filtering apparatus

Also Published As

Publication number Publication date
GB8531042D0 (en) 1986-01-29

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)