EP2533875A1 - Compressed air supply for the operation of moving bed filters - Google Patents
Compressed air supply for the operation of moving bed filtersInfo
- Publication number
- EP2533875A1 EP2533875A1 EP11742549A EP11742549A EP2533875A1 EP 2533875 A1 EP2533875 A1 EP 2533875A1 EP 11742549 A EP11742549 A EP 11742549A EP 11742549 A EP11742549 A EP 11742549A EP 2533875 A1 EP2533875 A1 EP 2533875A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- compressor
- compressed air
- pressure
- air
- moving bed
- 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.)
- Ceased
Links
- 238000000034 method Methods 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 210000000078 claw Anatomy 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 2
- 239000000446 fuel Substances 0.000 claims description 2
- 238000005461 lubrication Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims 1
- 238000007599 discharging Methods 0.000 claims 1
- 239000007788 liquid Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- 239000000314 lubricant Substances 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/36—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed fluidised during the filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/28—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed moving during the filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/46—Regenerating the filtering material in the filter
- B01D24/4668—Regenerating the filtering material in the filter by moving the filtering element
- B01D24/4689—Displacement of the filtering material to a compartment of the filtering device for regeneration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/48—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof integrally combined with devices for controlling the filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/48—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof integrally combined with devices for controlling the filtration
- B01D24/4884—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof 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
- B01D37/00—Processes of filtration
- B01D37/04—Controlling the filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D37/00—Processes of filtration
- B01D37/04—Controlling the filtration
- B01D37/046—Controlling the filtration by pressure measuring
Definitions
- the present invention relates generally to a method and a system for the supply of compressed air for operating granular bed filters and/or reactors of the moving bed type and particularly for operating air lift pumps in such filters.
- Moving bed filters are commonly used for treatment of water and wastewater.
- the granular media filter bed (hereafter filter bed) of such moving bed filters is kept in a slow motion by a transport device transporting granular filter media from the lower part of the filter bed to the top of the filter bed often via a washer for granular filter media, so-called media washer, in which the granular filter media is washed to remove pollutants that have been separated in the moving bed filter.
- One or more air lift pumps are normally used as such transport device.
- the air lift pump is operated with compressed air.
- an air lift pump is a tube immersed in a liquid, which may contain particles, with the inlet part of the tube at a lower level than outlet part thereof and in which compressed air is introduced close to the inlet part. Since the air/liquid/particle mixture in the air lift pump will have a lower density than the surrounding liquid or liquid particle mixture a pumping action will result.
- Air lift pumps offer a simple means of transporting liquids containing particles and the operating cost will largely depend on the cost of said compressed air. This cost is dependent on air pressure and air flow e.g. volume per unit of time. Air pressure is the factor that has the greatest influence on the cost of operating an air lift pump.
- the compressor is normally controlled in such a way that it pumps compressed air into a holding tank for air which feeds air into the filter system.
- the compressor is operated in on/off mode in such a way that a high pressure level and a low pressure level are set and when the air pressure in the tank has reached the high pressure the compressor is turned off and when the air pressure in the tank reaches the low pressure the compressor starts again. If a mid pressure compressor is used instead of the conventional compressor the system will fail.
- the pressure of the mid pressure compressor is close to the pressure needed by the air lift pump and therefore it is not possible to use it in the same system as the conventional compressor, since the on/off operation to control the compressor will lead either to too frequent starts and stops that will damage the compressor or the lower pressure set for the start of the compressor will be too low for operating the air lift pump.
- An object of the present invention is to provide a method and a system of the kind initially mentioned, wherein the drawbacks of prior art are eliminated or at least minimized.
- An electrical frequency control device is preferably used for the control of the rotational speed of an electrical motor.
- the rotational speed of a combustion engine is preferably controlled by controlling the fuel/air mixture fed to the engine.
- the moving bed filter comprises an air lift pump.
- a controller and a pressure sensor adapted to sense the pressure in the conduit are provided, wherein the controller is adapted to control the speed of the compressor in dependence of the sensed pressure in the conduit.
- the compressor is preferably a claw compressor.
- the compressor is devoid of lubrication in the air part.
- compressed air free from traces of lubricants can be produced for use in sensitive applications, e.g. drinking water production.
- a heat exchanger is adapted to cool compressed air in the conduit in order to condense the water vapor.
- the system is less sensitive to condensation of water in the tubes for the compressed air.
- Fig. 1 illustrates a conventional system according to prior art.
- Fig. 2 illustrates a system according to the invention.
- FIG. l shows a conventional system according to prior art with a compressor 1 which will normally be of the piston or screw compressor type.
- the compressed air in the compressed air line 2 passes a lubricant removal filter 3 for the removal of drops of lubricant which may have been entrained in the compressed air in the compressor.
- An air holding tank 4 for the compressed air is included in the system and the air pressure is controlled by an on/off control system with a pressure sensor 5 connected to a control box 6 which in turn gives a signal that controls the motor of the compressor in such a way that the compressor is stopped when the air pressure in the holding tank reaches a certain level and starts the motor of the compressor when the air pressure in the holding tank has fallen below a certain predetermined value.
- the pressure of the compressed air is finally reduced to the operating pressure needed for the transport device(s) of the moving bed filter(s) connected to the system in a pressure reducing device 7, wherein the pressure of the compressed air is reduced from approximately 7 Bars to a pressure of approximately 3-4 Bars and a further pressure reduction takes place in connection with the flow control devices in a pneumatic cabinet 8 used for the subsequent distribution of the compressed air to the transporting device(s) of the moving bed filter(s).
- Fig. 2 shows the proposed new system, generally designated 1 0, with a mid pressure compressor 1 1 with a motor with its rotational speed controlled by a controller in the form of a control box 14 which receives a signal from a pressure sensor 1 3, which senses the pressure in a conduit in the form of a compressed air line 1 2.
- the controller keeps the pressure in the compressed air line at close to a predetermined pressure in the range of 1 .2 - 2.0 Bars, preferably approximately 1 .5 Bars.
- the compressed air is optionally cooled in a heat exchanger 1 5, for instance with water provided through pipe 1 6.
- the compressed air line is arranged with a slope at least between the heat exchanger and a pneumatic cabinet 1 8 towards a lowest point where a valve 1 9 is used for evacuating condensate from the heat exchanger and the compressed air line.
- the heat exchanger 15 is arranged so that any condensate formed will be evacuated through the valve 1 9.
- the compressed air line will be arranged so that any condensate formed will flow to the lowest point of the line and be evacuated through valve 1 9.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Compressor (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US30383210P | 2010-02-12 | 2010-02-12 | |
SE1050143A SE534558C2 (en) | 2010-02-12 | 2010-02-12 | Methods and systems for supplying compressed air for operation of filters with variable bed |
PCT/SE2011/000024 WO2011099917A1 (en) | 2010-02-12 | 2011-02-11 | Compressed air supply for the operation of moving bed filters |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2533875A1 true EP2533875A1 (en) | 2012-12-19 |
EP2533875A4 EP2533875A4 (en) | 2013-07-17 |
Family
ID=43555043
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11742549.6A Ceased EP2533875A4 (en) | 2010-02-12 | 2011-02-11 | Compressed air supply for the operation of moving bed filters |
Country Status (5)
Country | Link |
---|---|
US (1) | US20130011274A1 (en) |
EP (1) | EP2533875A4 (en) |
CN (2) | CN201739768U (en) |
SE (1) | SE534558C2 (en) |
WO (1) | WO2011099917A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10702805B2 (en) | 2007-09-19 | 2020-07-07 | Nexom (Us), Inc. | Washbox |
US7897040B2 (en) | 2007-09-19 | 2011-03-01 | Blue Water Technologies, Inc. | Washbox |
EP2680933A4 (en) * | 2011-03-01 | 2015-01-14 | Nepsus Technologies Pty Ltd | Influent treatment process |
CA2949689A1 (en) | 2014-05-21 | 2015-11-26 | Nexom (Us), Inc. | Energy reduction and monitoring control system for backwashing media systems |
CN104950933B (en) * | 2015-05-29 | 2020-07-14 | 湖北绿色家园材料技术股份有限公司 | Stabilizer for system steam pressure |
CN113309186B (en) * | 2021-05-31 | 2022-04-19 | 北控水务(中国)投资有限公司 | Water purification plant clean water pool water level management energy-saving control method and system |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09158846A (en) * | 1995-12-05 | 1997-06-17 | Mitsubishi Heavy Ind Ltd | Air compressing unit |
US5730886A (en) * | 1994-12-13 | 1998-03-24 | Ashbrook-Simon-Hartley Corporation | Continuous self-cleaning filtration unit |
CN201306269Y (en) * | 2008-09-24 | 2009-09-09 | 东营市天信纺织有限公司 | Pressure constant device controlled by frequency converter |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU474911B2 (en) * | 1972-05-30 | 1976-08-05 | Universal Oil Products Company | Dense bed afterburning control ina catalytic regeneration zone |
US3891410A (en) * | 1973-07-30 | 1975-06-24 | Paul M Hankison | Dehydrating compressed air and gases |
US4558990A (en) * | 1980-05-12 | 1985-12-17 | Marco Seattle, Inc. | Composite pumping system |
US7381336B2 (en) * | 2003-10-14 | 2008-06-03 | Mm Filtration Company | Automated water treatment system and method of use |
JP4417178B2 (en) * | 2004-05-31 | 2010-02-17 | 株式会社日立産機システム | Compressed air production system |
GB2475245A (en) * | 2009-11-10 | 2011-05-18 | Lothar Peter Schmitz | Compressor assembly with planetary gear means |
-
2010
- 2010-02-12 SE SE1050143A patent/SE534558C2/en unknown
- 2010-03-12 CN CN2010201410570U patent/CN201739768U/en not_active Expired - Lifetime
-
2011
- 2011-02-11 US US13/578,670 patent/US20130011274A1/en not_active Abandoned
- 2011-02-11 EP EP11742549.6A patent/EP2533875A4/en not_active Ceased
- 2011-02-11 CN CN2011800092417A patent/CN102781536A/en active Pending
- 2011-02-11 WO PCT/SE2011/000024 patent/WO2011099917A1/en active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5730886A (en) * | 1994-12-13 | 1998-03-24 | Ashbrook-Simon-Hartley Corporation | Continuous self-cleaning filtration unit |
JPH09158846A (en) * | 1995-12-05 | 1997-06-17 | Mitsubishi Heavy Ind Ltd | Air compressing unit |
CN201306269Y (en) * | 2008-09-24 | 2009-09-09 | 东营市天信纺织有限公司 | Pressure constant device controlled by frequency converter |
Non-Patent Citations (1)
Title |
---|
See also references of WO2011099917A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2011099917A1 (en) | 2011-08-18 |
CN102781536A (en) | 2012-11-14 |
US20130011274A1 (en) | 2013-01-10 |
SE1050143A1 (en) | 2011-08-13 |
SE534558C2 (en) | 2011-10-04 |
EP2533875A4 (en) | 2013-07-17 |
CN201739768U (en) | 2011-02-09 |
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Legal Events
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Effective date: 20120816 |
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DAX | Request for extension of the european patent (deleted) | ||
A4 | Supplementary search report drawn up and despatched |
Effective date: 20130613 |
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RIC1 | Information provided on ipc code assigned before grant |
Ipc: B01D 33/00 20060101ALI20130607BHEP Ipc: B01D 37/04 20060101ALI20130607BHEP Ipc: B01D 24/48 20060101ALI20130607BHEP Ipc: B01D 24/28 20060101AFI20130607BHEP Ipc: B01D 24/46 20060101ALI20130607BHEP |
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17Q | First examination report despatched |
Effective date: 20130912 |
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STAA | Information on the status of an ep patent application or granted ep patent |
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18R | Application refused |
Effective date: 20171113 |