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WO1998043065A1 - Appareil de mesure de la permeabilite de particules de cristal en suspension dans une boue - Google Patents

Appareil de mesure de la permeabilite de particules de cristal en suspension dans une boue Download PDF

Info

Publication number
WO1998043065A1
WO1998043065A1 PCT/NL1998/000162 NL9800162W WO9843065A1 WO 1998043065 A1 WO1998043065 A1 WO 1998043065A1 NL 9800162 W NL9800162 W NL 9800162W WO 9843065 A1 WO9843065 A1 WO 9843065A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipe
filtrate
slurry
measuring
crystal particles
Prior art date
Application number
PCT/NL1998/000162
Other languages
English (en)
Inventor
Paul Jos Diepen
Viktor Peter Charles Vreeken
Original Assignee
Technische Universiteit Delft
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 Technische Universiteit Delft filed Critical Technische Universiteit Delft
Publication of WO1998043065A1 publication Critical patent/WO1998043065A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/082—Investigating permeability by forcing a fluid through a sample
    • G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change

Definitions

  • the invention relates to an apparatus for measuring the permeability of crystal particles suspended in a slurry, comprising a filtering element and driving means for driving the slurry into the filtering element, to which filtering element discharge means are connected for the filtrate and a measuring instrument for determining the flow rate of the filtrate.
  • a filtration simulator for determining the interaction and the effect on a liquid stream when additives are incorporated into a feed line for a paper mill.
  • This know apparatus comprises a slurry tank for receiving the feed for the papermaking machine, as well as filtering means comprising a permeable filter, wherein the feed side of the filter is in fluid communication with the slurry tank, and the discharge side of the filter is in fluid communication with the same slurry tank. Means are provided for measuring the pressure and the volume flow of the aqueous paper stream feed being conducted from the slurry tank through the filtering means.
  • the present apparatus relates to the measuring of the permeability of crystal particles suspended in a slurry.
  • the above-mentioned permeability is an indirect measure for the size of the crystal particles. There is a need for an apparatus providing a quick and accurate manner for determining said permeability.
  • a sample is taken from the slurry which is present in an apparatus or which is part of a process stream.
  • the problem with this method is the representativity of the sample taken and the logistics which have to be furnished for moving the sample to the laboratory where the apparatus for processing the sample is housed. It is the objective of the invention to provide an apparatus by means of which locally and in a relatively short measuring time the permeability of crystal particles suspended in a slurry can be determined in a manner which meets the standard of accuracy normally given for such measuring parameters .
  • the filter element is a pipe, in which the lumen between its two ends is covered by a filter medium provided therein, and the filtrate-supply side of the pipe is equipped for receiving the slurry.
  • the invention is based on the realization that when taking a sample, the filter cake initially builds up on the filter medium in the pipe, with the resistance of the filter cake increasing correspondingly.
  • the filter cake builds up until the end of the pipe is reached at the side where the pipe is receivingly coupled or can be coupled with a receptacle containing the slurry. From that moment the filter cake grows on three dimensionally, while the cake's resistance does not, or only slightly increase further.
  • the pipe may have any shape and may, for instance, taper toward either end. However, best results are obtained if the pipe is substantially cylindrical .
  • the three dimensional growth of the filter cake is spherical.
  • the apparatus according to the invention is characterized in that the pipe is substantially cylindrical, forming a funnel at the side of the discharge means and running into a discharge connection, and that the driving means comprise a vacuum pump which is connected to the discharge connection.
  • the term vacuum pump also includes a water jet pump or vacuum ejector, or generally any device with which a vacuum can be created at the side of the discharge connection.
  • a vacuum pump is not necessary if there is an overpressure in the slurry.
  • the filtrate's flow direction in the pipe be reversible.
  • This has the advantage that after measuring, the filtrate collected in the filtrate receptacle can be fed through the pipe in reversed direction so that the filter cake accumulated there, can be flushed back to the slurry.
  • this provides the advantage that after a measurement is carried out, the filter pipe is cleaned and also, that after com- pletion of a measurement the concentration of the slurry is not influenced by this measurement .
  • Another advantageous embodiment of the apparatus according to the invention is characterized in that at the discharge side of the pipe and the filtrate receptacle a buffer reservoir is provided to which the vacuum pump is connected.
  • a preferred embodiment of the apparatus is characterized in that the driving means used is a pump with a reversible fixed delivery and that both at the feed side and the discharge side of the pump a pipe is installed which is provided with a filter medium.
  • the lift or pressure difference over the pump can be measured in order to determine the moment when it no longer exhibits any significant change.
  • the value then reached is a measure for the resistance produced by the filter cake that has developed in the inlet pipe .
  • the respective pipe is flushed clean and a further measurement can take place with the other pipe.
  • the invention is further embodied in the separate filter element that is suitable to be applied in the apparatus for measuring the permeability of crystal particles according to the invention.
  • Fig. 1 shows an apparatus for measuring the permeability of crystal particles according to the invention
  • Fig. 2 shows a typical course of a measurement signal obtained with the apparatus according to the invention
  • Fig. 3 shows a separate filter element according to the invention
  • Fig. 4 shows an alternative embodiment of the apparatus for measuring the permeability of crystal particles according to the invention.
  • FIG. 1 shows the apparatus for measuring the permeability of crystal particles suspended in a slurry.
  • This apparatus is generally indicated by reference number 1 and comprises a filter element 3 and driving means 4, 5, 6 for driving slurry from a receptacle 2 into the filter element 3.
  • Fig. 3 the filter element 3 is shown in more detail. It is formed as a pipe, in which the lumen between its two ends A, B is covered by a filter medium 7 provided therein. To the one end B of the pipe 3 discharge means 8, 9 are connected, as well as a measuring instrument 10 for determining the flow rate of the filtrate. The other end A of the pipe 3 is receivingly coupled with or can be coupled with the slurry container 2.
  • the pipe 3 is substantially cylindrical as shown in Fig. 3, forming a funnel at the side of the discharge means 8, 9 and running into a discharge connection 11.
  • the driving means 4, 5, 6 for the filtrate comprise a vacuum pump 4 which via a buffer reservoir 5, a pipe 6, a filtrate receptacle 9 serving to collect filtrate drawn from the container 2, and a pipe 8, is connected to the filter element 3.
  • the apparatus is used as follows .
  • the filter element 3 is introduced into the slurry in the container 2.
  • an underpressure is created by means of the vacuum pump 4.
  • valve 12 is closed and valve 13 is open.
  • the vacuum pump 4 is stopped and valve 13 is closed.
  • the pipe 6 comprises also a three-way tap 14 which is adjusted such that the filtrate receptacle 9 is in communication with the pipe 6.
  • valve 12 is opened, resulting in an underpressure in filtrate receptacle 9, so that slurry is being sucked from the container 2 through the filter element 3.
  • the filtrate volume then registered by the flow meter 10 is shown in Fig. 2. Initially this filtrate volume increases by a value which is determined solely by the resistance of the filter medium 7.
  • the three-way tap 14 is adjusted such that an atmospheric pressure or possibly overpressure is created in the filtrate receptacle 9, causing the filtrate in the filtrate receptacle 9 to return in reverse flow direction through the filter element 3 to the receptacle 2.
  • the registered filtrate flow value preferably its constant portion, is processed and serves as measure for the permeability of the crystal particles from the slurry.
  • the vacuum pump 4 may be omitted if the slurry in the receptacle 2 is under pressure. Of course, in that case, a sufficient overpressure with regard to the pressure of the slurry is required in order to flush back the filtrate accumulated in the filtrate receptacle 9.
  • the apparatus according to the invention is provided with a pump 4 which has a reversible but in any case fixed delivery and that both the feed side and the discharge side of the pump 4 are provided with a filter element 3 which, according to the invention, takes the shape of a pipe provided in its lumen with a filter medium. Both filter elements 3 are introduced in the receptacle 2 containing the slurry comprising the suspended crystal particles.
  • the pressure build-up over the pump is measured by means of a measuring device 15. This pressure build-up reflects the resistance over the drawn- in filter element 3 which pressure increases during measurement and by which the permeability of the crystal particles suspended in the slurry in the receptacle 2 can be determined.
  • the filter element 3 When with said measurement the pressure has become constant, the per- meability of the crystal particles can be derived therefrom. If the pump is then switched over, the filter element 3 will be flushed clean while simultaneously a next measurement can be carried out with the filter element 3 located at the other side of the pump 4.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Filtration Of Liquid (AREA)

Abstract

L'invention concerne un appareil de mesure de la perméabilité de particules de cristal en suspension dans une boue, comprenant un élément filtrant (3) ainsi que des moyens d'entraînement (4, 5, 6) destinés à entraîner la boue dans l'élément filtrant, lequel est relié à des moyens d'évacuation (8, 9) du filtrat et à un instrument de mesure (10) servant à déterminer la vitesse d'écoulement du filtrat, et est constitué d'un tuyau dans lequel la lumière située entre ses deux extrémités est obstruée par un milieu filtrant monté dans le tuyau. Le côté alimentation en filtrat du tuyau est conçu pour recevoir la boue.
PCT/NL1998/000162 1997-03-21 1998-03-23 Appareil de mesure de la permeabilite de particules de cristal en suspension dans une boue WO1998043065A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1005595A NL1005595C2 (nl) 1997-03-21 1997-03-21 Inrichting voor het meten van de permeabiliteit van kristaldeeltjes.
NL1005595 1997-03-21

Publications (1)

Publication Number Publication Date
WO1998043065A1 true WO1998043065A1 (fr) 1998-10-01

Family

ID=19764639

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL1998/000162 WO1998043065A1 (fr) 1997-03-21 1998-03-23 Appareil de mesure de la permeabilite de particules de cristal en suspension dans une boue

Country Status (2)

Country Link
NL (1) NL1005595C2 (fr)
WO (1) WO1998043065A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2676120A4 (fr) * 2011-02-14 2018-01-24 The Administrators Of The Tulane Educational Fund Dispositif et procédé pour contrôler la présence, l'apparition et l'évolution de matières particulaires dans des systèmes de réaction chimiques ou physiques

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52129579A (en) * 1976-04-23 1977-10-31 Hitachi Ltd Method and system for measuring clogging of filter
GB2060432A (en) * 1979-10-10 1981-05-07 Teledyne Ind Solid impurity detector
US4891098A (en) * 1989-01-18 1990-01-02 Albany International Corp. Dynamic filtration simulator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52129579A (en) * 1976-04-23 1977-10-31 Hitachi Ltd Method and system for measuring clogging of filter
GB2060432A (en) * 1979-10-10 1981-05-07 Teledyne Ind Solid impurity detector
US4891098A (en) * 1989-01-18 1990-01-02 Albany International Corp. Dynamic filtration simulator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 002, no. 013 (E - 008) 28 January 1978 (1978-01-28) *

Also Published As

Publication number Publication date
NL1005595C2 (nl) 1998-09-22

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