Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
  • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
  • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
  • B07B13/14—Details or accessories
  • B07B13/18—Control
• • 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
• • 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
  • B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
  • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
  • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
  • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
  • B07B1/50—Cleaning
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
  • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
  • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
  • B07B13/14—Details or accessories
  • B07B13/16—Feed or discharge arrangements
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
  • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
  • D21D5/02—Straining or screening the pulp
  • D21D5/04—Flat screens
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
  • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
  • B07B2230/00—Specific aspects relating to the whole B07B subclass
  • B07B2230/01—Wet separation

Definitions

• the present invention is in the field of the separation of constituents from a fluid medium, said medium being liquid, gaseous or solid.
• fluid means a deformable medium.
• the separation is a differential separation of constituents from the medium as a function of their size, in particular three-dimensional, that is to say of their geometric space requirement. Consequently, the segregation of the constituents will be based on their size, as well as on their behavior of displacement in said fluid medium.
• the invention particularly relates to a device for separating constituents from a fluid medium.
• Such a device will find particular application in the field of recycling and / or treatment of industrial waste, particularly in the field of food packaging such as paper.
• the separation devices of the prior art comprise a tank equipped with a perforated screen.
• This sieve allows separation, depending on their size, the various elements of the fluid mixture.
• the fluid mixture arrives upstream of said sieve, a part of this fluid mixture, called “accepted” through the sieve, while another part, named “restraint” is blocked on said sieve.
• the size of these perforations, the type of fluid mixture to be separated, the pressure upstream and the pressure downstream of the sieve, the surface upstream of the sieve is subject to the risk of clogging. Clogging of the screen prevents the separation operation from continuing. Indeed, a pile of The components of the fluid mixture can clog the screen and prevent its selective separation function. The presence of this cluster will block the circulation and block the passage of accepted through the sieve. More particularly, because of solid constituents present in suspension in the fluid medium and whose size is of the same order of magnitude as the size of the perforations, these constituents may agglomerate on or in the perforations and render them inoperative.
• the traditional solution to avoid this clogging without changing the size of the perforations of the sieve is to use a rotor equipped with rotatable unclogging blades. Said rotor is placed near the sieve, often upstream, within the separation tank under pressure or not. The movement of the rotor blades, near the sieve, locally generate a counterflow of the flow of dough passing through the sieve. This countercurrent will allow to destructure the cluster of constituents of the environment clogged on the sieve. This phenomenon is commonly called "rotor unclogging effect”.
• the solution of the unclogging blade rotor has several disadvantages.
• the number and design of the blades are fixed, therefore the frequency, intensity and duration of unclogging can only be changed by changing the speed of rotation of the rotor.
• One of the solutions for modifying these parameters is to accelerate the speed of rotation of the rotor.
• this solution generates an overconsumption of energy and a decrease in "selectivity" of separation, that is to say the ability to separate the components according to their size.
• a decrease in separation selectivity leads to additional costs, but also to more wear and tear. fast, especially at the blades.
• the additional costs may concern the initial investment, the increased energy consumption, the quality of the separation and an increase in the frequency of complex maintenance operations.
• said rotor has the disadvantage of being placed directly within the vessel and coming into contact with the medium to be separated. Thus, there is a risk of contamination of the medium to be separated by the rotor itself.
• the present invention aims to overcome the disadvantages of the state of the art, by proposing a device for separating the constituents of a fluid medium, comprising a separating element of these constituents, helping to delimit, upstream and / or downstream of said separating element, a closed chamber to which at least one duct C is connected.
• said duct comprises at least one activatable closing means whose activation is suitable for closing and at least partially opening said duct C;
• Said device comprises means for controlling the activation of said shutter means or means, adapted to control the closing and opening, at least partially, of said conduit C, cyclically, at a frequency greater than 0.008 Hz.
• said means for controlling the activation of the one or more closure means are capable of controlling the closing and the opening, at least partially, of said duct C, in a cyclic manner, at a frequency greater than 0.03 Hz
• the device comprises means for managing said control means, said management means being capable of performing a cycle, each cycle comprising at least one activation phase PA of the closure means and at least one phase of no PI activation of said one or more shutter means;
• said closure means comprise at least one element
• the closure means comprise at least one fixed flap on a mobile disk in rotation, said management means being able or not to the mobility of the disk through management means, so that said component:
• an activation phase PA of the closure means comprises at least one closing and opening sequence S, defined by the closure followed by the opening at least partially of said conduit C, said sequence S being of a shorter duration at 1 min, preferably less than 30 s, for example less than 15 s;
• said means for managing said control means are suitable for the PA activation phase to last less than 50% of the cycle time and / or the PA activation phase to last less than 2 minutes, preferably less of
• said means for managing said control means are capable of ensuring that the amplitude of closing and at least partial opening of said duct C by the closing means during an activation phase PA is greater than or equal to 60, 40 or at least 20%.
• the present invention also relates to a declogging process implementing said device of the invention, comprising the following steps:
• a pressure variation is generated at the interface of the separating element in order to unclog the latter, through the activation of the one or more closure means in a succession of cycles at a frequency greater than 0.008 Hz, each cycle comprising at least one S sequence of closure and total or partial opening.
• Figure 1 schematically shows a view of the device 1 of the invention according to three different embodiments respectively 1A, 1B, 1C;
• FIG. 2 diagrammatically shows, as a function of time, the rate of closure of the duct C by the element E, that is to say the shutter intensity of the duct varying between 0 and 100%, according to a first particular embodiment comprising a succession of two identical cycles, comprising a non-activation phase of the closure means and an activation phase of the closure means, said activation phase comprising two opening and closing sequences ;
• FIG. 3 diagrammatically represents a view of one embodiment of the closure means 5 of the invention
• FIG. 4 diagrammatically represents another particular mode of operation in which the rate of closure of the duct C by the element E, as a function of time, varies between limits of between 30 and 90%, and in which a cycle comprises an activation phase and an inactivation phase, said activation phase comprising an opening sequence, closing followed by an opening.
• the present invention relates to a device 1 for separating constituents of a fluid medium M, visible in FIG. 1.
• Said medium M can be in liquid and / or gaseous and / or solid form.
• the separation is carried out according to a size differential of said constituents of the medium M.
• Said device 1 can be used in the field of filtration, purification, fractionation, thickening, for example of cellulosic fibers or water filtration.
• the separation device 1 may be used in the paper industry, in particular recycled paper recycling.
• This paper that is cellulosic fibers, will have to be purified to remove unwanted constituents.
• the undesirable constituents may be metallic materials, or else plastic or mineral materials.
• the medium M consists of a mixture having several undesirable constituents, which it is desired to separate cellulosic fibers.
• the separation device 1 may also be used, especially in a treatment plant, for the treatment of water to separate polluting waste or not, especially those of large caliber.
• the waters to be treated may contain mineral materials, such as pebbles, soil or any other undesirable element commonly referred to as "suspended matter”.
• the device 1 of the invention comprises at least one separation element 3 of the constituents of the fluid medium M.
• Said separating element 3 has a first face 31 called “upstream” coming into contact with said medium M, as opposed to a second face 32 called “downstream”.
• Said separation element 3 comprises one or more perforations 4 allowing or not the passage of the constituents of the medium M through said separation element 3.
• perforations 4" calibrated openings 4 in the separation element 3, the size of these openings will depend on the size of the various constituents of the medium M that is desired to separate and the desired degree of segregation .
• the perforation may be a slot width of 0.15 mm, holes of diameter 2 mm or a canvas of 150 mesh.
• the constituents of the medium M, which pass through the perforations 4, passing through the first face 31 upstream and out through the second face 32 downstream, are accepted "A”.
• the constituents of the medium M, which do not pass through the perforations 4 and which remain retained on the first face 31 upstream of the separation element 3, are the "R" refusals.
• said separation element 3 contributes to delimiting a closed chamber 2 to which at least one duct C is connected.
• the arrows indicated in these figures show the direction of movement of the accepted A's and / or refusal R and / or medium M in the device 1.
• said duct C has an opening area 6 allowing the passage of constituents.
• the closed enclosure 2 connected to at least one duct C, is upstream of the separation element 3.
• the duct C can be used to both at the feed inlet in medium M and the evacuation of rejections R.
• the closed enclosure 2 connected to at least one duct C, is downstream of the separation element 3.
• the duct C serves as the duct evacuation of accepted A.
• said separation element 3 is internal to the closed enclosure 2.
• this separation element 3 is positioned in the center of the closed enclosure 2.
• the closed chamber 2 has at least three ducts C, including a feed inlet duct C1 in medium M, a duct C2 of evacuation of the accepted A and a conduit C3 of evacuation of refusals R.
• the pressure upstream of said separating element 3 will be called “Pl”.
• the pressure downstream of said separating element 3 will be called “P2”.
• the separation of the constituents of the fluid medium M into the category of accepted A or of the refusal R is a separation carried out in:
• applying a pressure means that the pressure is obtained by the use of a pressurizing or depressurizing means, such as for example a pump, a compressor, a water column or any other obvious technical solution to the pressure. skilled in the art.
• the pressure can also be obtained by the use of atmospheric pressure.
• the feed allows the fluid medium M to come into direct contact with the face 31 of the separating element 3.
• the pressure difference between P1 and P2 makes it possible for the accepted members A to pass through said perforations 4.
• the separation of the constituents of the fluid medium M, able to pass through the separation element 3, is possible especially if P1 is greater than or equal to P2.
• the separation of the constituents of the fluid medium M is possible in particular thanks to the pressure difference existing between the upstream and the downstream of the said separation element 3.
• this pressure difference is found on the the entire surface of the separating element 3, the action is global. This is an advantage over the state-of-the-art rotor only device which generates a pressure difference only at the sieve location where the rotor blades are located. In the prior art, the rotor only causes a local pressure deviation action unlike the device 1 of the invention.
• the perforations 4 of the separating element 3 may become clogged, partially or completely, with constituents of the fluid medium M.
• Constituents of the medium M then form one or more clusters of constituents clogging the separating element 3, degrading and / or preventing the passage of accepted A.
• the cluster or clusters of constituents of medium M may or may be present, partially or completely on the face 31 of the separating element 3 and thus prevent the separation between accepted A and refusal R to be performed correctly.
• the device 1 comprises closure means 5 of the conduit C which make it possible to modify the pressure difference between P1 and P2 sufficiently to allow unclogging of the separating element 3. More specifically, the clogging conditions of the separation element 3 are associated with the pressure difference between P1 and P2.
• the objective of the invention is to modify these pressure conditions by acting on the rate of closure of the duct C.
• the passage of fluid, in the duct or conduits C connected to the chamber 2 is modified by the invention which has the favorable consequence of modifying the pressure conditions P1 and P2 and thus the sealing conditions.
• Said shutter means 5 are external to the closed chamber 2 of the device 1 of the invention, since they are positioned inside the duct C. These shutter means 5 make it possible to act and modulate the pressure present. inside the closed enclosure 2.
• the closure means 5 comprise at least one element E fixed on a mobile support 51.
• Said element E is intended to block, or not, integrally or partially, said conduit C, depending on its position and its geometrical shape with respect to said duct C.
• Partial or total sealing of the duct C will make it possible to modify the rate of passage of the constituents, for example accepted A or R refusals, through the opening area 6 of said duct C.
• Modifying said flow rate within said conduit C, or even the cancellation of this flow rate at a time t, during the process of separating the constituents will generate a variation of the internal pressure P1 and / or P2 within the closed chamber 2.
• the total or partial closure of the conduit C coupled to the variation of the internal pressure within the closed chamber 2, makes it possible to vary the difference between the pressures P1 and P2, upstream and downstream of the separating element 3.
• the variation of this pressure difference between P1 and P2 is the phenomenon resulting from the closure of the conduit C. This phenomenon of changing the pressure difference between P1 and P2 is achievable during the process of separation.
• a sufficient change in the pressure difference between P1 and P2 possibly assisted by the action of a paddle rotor, and / or assisted by the action of a feed flow of the medium M, and / or assisted by the action of a flow of an auxiliary fluid, such as dilution water, allows the lifting of the cluster of constituents of the medium M can clog the face 31 of the separating element 3 or able to seal the perforations 4.
• the presence of the closure means 5 generates a variation of the difference between P1 and P2, through a change in the flow rate in the duct C. Consequently, the presence of the closure means 5 makes it possible to participate in unclogging the separation element 3.
• the invention is particularly effective in case of fluid transport deemed incompressible or density greater than 0.5 kg / L.
• the fluid contains mainly water and has a density of the order of 1 kg / L, which makes the shutter effect of the conduit C very effective.
• the means shutters 5 are activatable, their activation being suitable for the opening or at least partial closing of the conduit C with the aid of the element E.
• the activation of the closure means 5 results in the continuous mobility of the support means 51.
• the inactivation of the closure means 5 results in a fixed and immobile position of the support means 51. .
• the device 1 comprises control means 7 for activating the closure means 5, that is to say means 7 which control the mobility of the support means 51 of the element E.
• control means 7 make it possible to control the closure and the opening, at least in part, of said duct C.
• control means 7 activate or inactivate the closure means 5, that is to say that they generate or not the mobility of the support means 51 thus the displacement of the element E relative to to the duct C.
• said control means 7 control the closure and the opening, at least partially of said duct C, in a cyclic manner, at a frequency greater than 0.008 Hz, or a time less than 2 min.
• said frequency is greater than 0.016 Hz corresponding to a cycle time which is less than or equal to 1 min.
• said frequency is greater than 0.033 Hz corresponding to a cycle time of less than or equal to 30 s.
• the device 1 also comprises management means 8 of said control means 7, said management means 8 being suitable for carrying out a cycle.
• each cycle takes less than 30 seconds.
• the period of each cycle is then less than 30 seconds. So, every 30 seconds, a new cycle starts.
• Each cycle comprises at least one activation phase PA of the shutter means 5 and at least one non-activation phase PI of said shutter means 5 as illustrated in FIG. 2 or FIG. 4.
• FIG. 2 illustrates an example of evolution of the closure rate of the conduit C as a function of time, with two consecutive cycles of closure of the conduit C.
• the closure rate of the duct C represents the ratio of the area of the element E which closes the duct C divided by the total area 6 of the duct C.
• a shutter rate of 10% means that, if the 100% open duct C has an area of 0.1 m 2 , the element E closes 0.01 m 2 of the duct C area and there remains a fluid passage section of 0.09 m 2 .
• a shutter rate of 90% means that there is only 0.01 m 2 of passage section and the element E closes 0.09 m 2 of the area of the duct C.
• This shutter ratio is associated with the efficiency of the desired declogging effect, applied to the separating element 3.
• the more or less significant filling of the pipe C modifies the flow conditions of fluid in said duct C, which influence the pressures P1 and P2 above, and thus modify the unclogging and separation effect.
• the PA activation phase results in a mobility of the means support 51 thus of the element E with respect to the conduit C, while the non-activation phase PI results in the immobility of said support means 51 of the element E with respect to the conduit C.
• an activation phase PA of the closure means 5 comprises at least one sequence S of closing and then opening of the conduit C.
• the activation phase PA comprises at least one displacement closing and opening the element E with respect to the conduit C, so that said element E closes at least partially said conduit C and at least once during a cycle.
• the duration of an activation phase PA is less than 50% of the duration of the cycle.
• the additional inactivation phase duration is greater than 50% of the cycle time.
• the duration of an activation phase PA must be less than or equal to 60 s for a cycle of 2 min, to 30 s for a cycle of 1 min and 15 s for a cycle of 30 s.
• the duration of a non-activation PI phase is greater than respectively 60 s, 30 s and 15 s.
• Each S closing and opening sequence is defined by its amplitude.
• valve openings are very small, typically less than 5% because the desired effect is not to disturb the pressures in the process apparatus. It is the opposite that is sought in the present invention, where it is important that the device 1 can allow to have an amplitude for the same strong S sequence.
• the amplitude of the shutter rate during a sequence S is always greater than 20%. In a more preferred mode, it is greater than 40%. According to a preferred embodiment, the amplitude of a sequence S is greater than 60%.
• the "nominal shutter ratio" is the percentage of the total area of duct C that the element E obturates during an inactivation phase PI.
• the amplitude of the activation phase during a sequence S is always greater than at least 15% of the nominal shutter rate applied during the inactivation phase PI.
• the dimensions of the element (s) E and the arrangement on its mobile support means 51 make it possible to ensure that, during the production of a sequence S, the sealing surface of the element E varies. significantly with respect to the nominal sealing surface, that is to say the percentage of the total area of the duct C closed by the element E during a phase of inactivation PI.
• each S closing and opening sequence is defined by its duration Ds and its shutter rate also called intensity I.
• the duration Ds of a sequence S corresponds to the sum of the duration Df of the moving operation of the element E in the the direction of closing or closing said duct C and the duration of displacement in the other direction, C, for the opening of said duct C.
• the mobility speed of said support means 51 i.e. the speed at which the element E moves in front of the opening area 6 of the conduit C;
• the geometric shape of the element E which may represent a percentage higher or lower than the opening area 6 of the duct C.
• the duration Df the time required to vary the shutter ratio between its minimum value and its maximum value, the duration Df, must remain less than 10 seconds, and preferably less than 5 seconds, and even more preferably lower at 2 seconds.
• the duration Do must respect the same durations of less than 10 seconds, preferably 5 seconds, preferably 2 seconds.
• the total duration Ds of a closing and opening sequence S according to the invention is less than 20 seconds, preferably less than 10 seconds, and advantageously less than or equal to 4 seconds to allow a acceptable average production, between maximum production, and reduced production due to start of clogging or non - production due to ongoing unclogging operation. .
• the management means 8 of the means of command 7 define the duration of the mobility of the support means 51 and the speed of displacement of these support means 51 thus of the element E.
• management means 8 also define the duration of the immobility of the support means 51 and therefore of the element E.
• the management means 8 make it possible to define the moment when one transitions from the activation phase PA to the phase of non-activation PI of the closure means 5, and in particular to define the position of the element E with respect to the conduit C during the stopping of the support means 51.
• the management means 8 control the duration of the non-activation phase PI and the duration of the activation phase PA of the closure means 5.
• the management means 8 control the duration of a cycle and the repetition frequency of said cycle.
• said closure means 5 may be a shovel valve, a ball valve or a butterfly valve, of a special design to ensure a high operating speed and controlled wear despite a number of cycles very important, of the order of 1000000 (one million) cycles per year.
• the sealing means 5 consist of a rotating disc 56.
• the disk 56 consists of a support armature 51 and at least one shutter 55 for closing the conduit C, said disk 56 serving as support means 51 for the shutter 55.
• closure means 5 comprise as element E at least said flap 55 can be in any form.
• the continuous rotation of the disc 56 causes the continuous rotation of said shutter 55, the latter will come to gradually close the conduit C.
• the flap 55 is then movable, according to this continuous movement, during the process of separating the constituents of the medium M, during the activation phase.
• the disk 56 is fixed, so the flap 55 too.
• the fixed position of the shutter 55 relative to the duct C is managed by the management means 8.
• the management means 8 are suitable for said flap 55:
• the speed of rotation of the disk 56 can be adjusted by using, for example, as a management means 8, a controller managing, as control means 7, a frequency converter connected to a motor rotating the disk 56.
• the closing time Df of the duct C of a sequence S is a function of the number and the size of the shutters 55 present on the disk 56 in rotation.
• the closing time Df thereof will be longer than for a number and a caliber of flaps 55 more restricted, and this for the same speed of rotation of the disc 56.
• the shape and the number of flaps 55 make it possible to adjust the duration of the closing of the duct C without modifying the speed of rotation of the disc 56.
• the characteristics of the fluid medium M and the actual or potential appearance of a cluster clogging the separation element 3 the number of S-sequence in a cycle, the duration of the PA activation phase and the duration of the PI nonactivation phase.
• the shutter phenomenon, partial or total, is punctuated by performing these cycles before, during or after the operation of separating the constituents of the medium M in the device 1.
• the content of a cycle is characterized according to the pressure difference between P1 and P2 that will be necessary to obtain to prevent clogging of the separation element 3. This pressure difference will depend on the nature of the environment.
• the closure means 5 thus have the advantage of being able to modify and vary the pressure difference over the entire interface and close to the separating element. 3 thus to cause its unclogging.
• the closure means 5 have the advantage of being able, by modifying the throughput rate in the duct C, to generate a variation of the pressure difference between P1 and P2 capable of decolouring or improving. the unclogging of the separation element 3, this during the separation operation.
• the closure means 5 make it possible, during the separation, to modify, in a cyclic manner, the pressure differential at the interface between the medium M and the face 31 of the separating element 3, and therefore to raise the pressure. clusters of medium M can clog the face 31.
• the closure means 5 can prevent clogging or improve declogging during the operation of separating the constituents of the medium M through the device 1 of 1 ' invention.
• the device 1 of the invention thus makes it possible to prevent clogging of the separation element 3.
• the elimination of the clogging phenomenon within the device has the advantage of:
• the device 1 of the invention therefore makes it possible to perform an adjustable declogging in terms of frequency and duration, and of intensity which is achieved remotely by activating closure means 5 present outside the enclosure 2 within which is the separation process.
• the variation of the shutter ratios may not be limited to values comprised between 0% and 100% of closure of the duct C.
• the activation phase PA comprises a sequence S of opening Do 1 and closing Df 1 followed by an opening Do 2.
• the shutter rate of the conduit C by the element E is 30%.
• a first activation of the shutter means 5 opens the conduit C for a duration Do 1.
• the shutter rate by the element E drops to 10%.
• a closure Df 1 by the element E generates a rise of this shutter ratio to 90%, then a second opening Do 2 down to 30%.
• the shutter rate value remains at 30% until the beginning of the next cycle.
• the control means 7 activate the shutter means 5 so that the shutter ratio is between limit values of the shutter rate of the conduit C by the element E between 30 and 90%.
• the device 1 of the invention can also be equipped with a blade rotor near the separating element 3 capable of lifting by a mechano-hydraulic action the cluster present on the surface 31 of the separating element 3.
• a blade rotor near the separating element 3 capable of lifting by a mechano-hydraulic action the cluster present on the surface 31 of the separating element 3.
• the present invention also relates to a declogging process using the device 1 of the invention comprising the following steps:
• a pressure variation is generated at the interface of the separation element 3 in order to unclog the latter, through the activation or non-activation of the closure means 5 in a succession of cycles at a higher frequency at 0.008 Hz, each cycle comprising at least one S sequence of closure and total or partial opening of at least one duct C.
• the device 1 of the invention is usable in many fields of application, the field of treatment or recycling of cellulose fibers, for example from virgin pulp, packaging cartons, newsprint, magazines.
• the device 1 of the invention can be used in particular for purification, fractionation, washing or thickening operations, for fluid filtration or in a paper machine.
• the paper is mixed with water, in a pulper, so that the cellulose fibers are suspended.
• the pulp obtained contains undesirable elements that must be removed. These undesirable elements may be, for example, in the case of recycled paper, glue particles, inks, minerals, staples, etc.
• a purification operation is carried out in a screen purifier. Said sieve is susceptible to clogging by various constituents of the fluid medium, here water, said to pass mainly through the perforations.
• the use of the device 1 of the invention for this purification operation is advantageous to avoid clogging or improve declogging.
• the perforations of the sieve may be of a very small size, for example holes with a diameter of between 0.2 mm and 3 mm or slots with a width of between 0.05 mm and 1 mm.
• the smallness of these perforations makes the separation operation sensitive to the risk of clogging of the sieve preventing the separation operation from continuing.
• a pressure difference between P1 and P2 of between 0.1 and 0.2 bar makes it possible in this case to avoid the clogging phenomenon near or at the sieve interface.
• the use of the device 1 of the invention for this fractionation operation is advantageous to avoid this clogging.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Paper (AREA)
• Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
• Separation Using Semi-Permeable Membranes (AREA)
• Centrifugal Separators (AREA)
• Combined Means For Separation Of Solids (AREA)
• External Artificial Organs (AREA)
• Investigating Or Analysing Biological Materials (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=56148574

Family Applications (1)

Country Status (12)

Family Cites Families (23)

• 2016
  • 2016-01-22 FR FR1650528A patent/FR3046946A1/fr active Pending
  • 2016-05-13 FR FR1654287A patent/FR3046947B1/fr active Active
• 2017
  • 2017-01-20 KR KR1020187016989A patent/KR20180104284A/ko unknown
  • 2017-01-20 US US16/062,811 patent/US11203043B2/en active Active
  • 2017-01-20 BR BR112018011968-7A patent/BR112018011968A2/pt not_active Application Discontinuation
  • 2017-01-20 JP JP2018557214A patent/JP6850306B2/ja active Active
  • 2017-01-20 CN CN201780004720.7A patent/CN108883436A/zh active Pending
  • 2017-01-20 RU RU2018124649A patent/RU2721676C2/ru active
  • 2017-01-20 CA CA3001428A patent/CA3001428C/fr active Active
  • 2017-01-20 MA MA043675A patent/MA43675A/fr unknown
  • 2017-01-20 WO PCT/FR2017/050125 patent/WO2017125692A1/fr active Application Filing
  • 2017-01-20 MX MX2018008806A patent/MX2018008806A/es unknown
  • 2017-01-20 EP EP17706844.2A patent/EP3405296A1/fr active Pending

Also Published As

Similar Documents

Legal Events