EP2533875A1 - Apport d'air comprimé pour le fonctionnement de filtres à lit granulaire mobiles - Google Patents

Apport d'air comprimé pour le fonctionnement de filtres à lit granulaire mobiles

Info

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
Application number
EP11742549A
Other languages
German (de)
English (en)
Other versions
EP2533875A4 (fr
Inventor
Hans F. Larsson
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.)
Nordic Water Products AB
Original Assignee
Nordic Water Products AB
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 Nordic Water Products AB filed Critical Nordic Water Products AB
Publication of EP2533875A1 publication Critical patent/EP2533875A1/fr
Publication of EP2533875A4 publication Critical patent/EP2533875A4/fr
Ceased legal-status Critical Current

Links

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

L'invention concerne un procédé d'apport d'air comprimé destiné au fonctionnement de filtres à lit granulaire mobiles au moyen d'un compresseur, qui est caractérisé par le réglage de la pression de l'air comprimé provenant du compresseur par réglage de la vitesse de rotation du compresseur. L'invention concerne également un système permettant d'apporter de l'air comprimé. Grâce à l'utilisation du procédé et du système de l'invention, il est possible d'obtenir d'importantes économies d'énergie d'environ 50 %.
EP11742549.6A 2010-02-12 2011-02-11 Apport d'air comprimé pour le fonctionnement de filtres à lit granulaire mobiles Ceased EP2533875A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US30383210P 2010-02-12 2010-02-12
SE1050143A SE534558C2 (sv) 2010-02-12 2010-02-12 Sätt och system för tillförsel av tryckluft för drift av filter med rörlig bädd
PCT/SE2011/000024 WO2011099917A1 (fr) 2010-02-12 2011-02-11 Apport d'air comprimé pour le fonctionnement de filtres à lit granulaire mobiles

Publications (2)

Publication Number Publication Date
EP2533875A1 true EP2533875A1 (fr) 2012-12-19
EP2533875A4 EP2533875A4 (fr) 2013-07-17

Family

ID=43555043

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11742549.6A Ceased EP2533875A4 (fr) 2010-02-12 2011-02-11 Apport d'air comprimé pour le fonctionnement de filtres à lit granulaire mobiles

Country Status (5)

Country Link
US (1) US20130011274A1 (fr)
EP (1) EP2533875A4 (fr)
CN (2) CN201739768U (fr)
SE (1) SE534558C2 (fr)
WO (1) WO2011099917A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7897040B2 (en) 2007-09-19 2011-03-01 Blue Water Technologies, Inc. Washbox
US10702805B2 (en) 2007-09-19 2020-07-07 Nexom (Us), Inc. Washbox
WO2012116404A1 (fr) * 2011-03-01 2012-09-07 Nepsus Technologies Pty Ltd Procédé de traitement d'influent
CA2949689A1 (fr) * 2014-05-21 2015-11-26 Nexom (Us), Inc. Systeme de commande de surveillance et de reduction d'energie pour laver a contre-courant des systemes de milieu
CN104950933B (zh) * 2015-05-29 2020-07-14 湖北绿色家园材料技术股份有限公司 一种系统蒸汽压力的稳定装置
CN113309186B (zh) * 2021-05-31 2022-04-19 北控水务(中国)投资有限公司 一种净水厂清水池水位管理节能控制方法及系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09158846A (ja) * 1995-12-05 1997-06-17 Mitsubishi Heavy Ind Ltd 空気圧縮ユニット
US5730886A (en) * 1994-12-13 1998-03-24 Ashbrook-Simon-Hartley Corporation Continuous self-cleaning filtration unit
CN201306269Y (zh) * 2008-09-24 2009-09-09 东营市天信纺织有限公司 变频器控制压力恒定装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
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 (ja) * 2004-05-31 2010-02-17 株式会社日立産機システム 圧縮空気製造システム
GB2475245A (en) * 2009-11-10 2011-05-18 Lothar Peter Schmitz Compressor assembly with planetary gear means

Patent Citations (3)

* Cited by examiner, † Cited by third party
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 (ja) * 1995-12-05 1997-06-17 Mitsubishi Heavy Ind Ltd 空気圧縮ユニット
CN201306269Y (zh) * 2008-09-24 2009-09-09 东营市天信纺织有限公司 变频器控制压力恒定装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2011099917A1 *

Also Published As

Publication number Publication date
CN102781536A (zh) 2012-11-14
US20130011274A1 (en) 2013-01-10
WO2011099917A1 (fr) 2011-08-18
CN201739768U (zh) 2011-02-09
SE1050143A1 (sv) 2011-08-13
SE534558C2 (sv) 2011-10-04
EP2533875A4 (fr) 2013-07-17

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