US2717536A - Conditioning paper-making stock - Google Patents

Conditioning paper-making stock Download PDF

Info

Publication number
US2717536A
US2717536A US369614A US36961453A US2717536A US 2717536 A US2717536 A US 2717536A US 369614 A US369614 A US 369614A US 36961453 A US36961453 A US 36961453A US 2717536 A US2717536 A US 2717536A
Authority
US
United States
Prior art keywords
stock
dirt
vacuum
fraction
hydrocyclone
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.)
Expired - Lifetime
Application number
US369614A
Other languages
English (en)
Inventor
Carleton L Clark
William W Hickey
Robert G Kaiser
James A Smith
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.)
ROTAREAED Corp
Original Assignee
ROTAREAED CORP
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
Priority claimed from US327920A external-priority patent/US2730510A/en
Application filed by ROTAREAED CORP filed Critical ROTAREAED CORP
Priority to US369614A priority Critical patent/US2717536A/en
Priority to GB35076/53A priority patent/GB755973A/en
Priority to DE1954R0013346 priority patent/DE1038390C2/de
Priority to FI0066/54A priority patent/FI40265B/fi
Priority to FR1097654D priority patent/FR1097654A/fr
Priority to AT189047D priority patent/AT189047B/de
Application granted granted Critical
Publication of US2717536A publication Critical patent/US2717536A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • D21D5/26—De-aeration of paper stock
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/24—Multiple arrangement thereof
    • B04C5/28—Multiple arrangement thereof for parallel flow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
    • C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
    • C08G59/68—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the catalysts used
    • C08G59/681—Metal alcoholates, phenolates or carboxylates
    • C08G59/685—Carboxylates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/13—Phenols; Phenolates
    • 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
    • D21D5/18—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force

Definitions

  • This invention relates to the removal of gas and dirt from paper-making stock to ready it for the paper-making machine. It has heretofore been proposed to improve its handleability by de-aerating it, sometimes referred to as de gasirying it. This is accomplished by atomizing the pumpably fluid stock into a receiver while subject to the influence of substantial vacuum, collecting a pond of de-aerated stock while still under the influence of vacuum, and then conducting it to the paper-making machine. Such a proposal has been patented in, the patent to De CeWNo. 2,57l,2l9, patented October 16, 1951. it has also been proposed to clean or to de-dirt the stock prior to supplying it to the paper-making machine.
  • This proposal has been carried out by treating the stock centrifugal separating or segregating devices to divide the stock into fractions of which one is substantially dirt-free, or at least dirt-poor, and thus acceptably clean stock, while the other has the dirt concentrated in it or is dirtich, so it may be referred to as rejectably dirty stock.
  • One such proposal has been patented in the patent to Samson et al., No. 2,377,524, patented June 5, 1945, while another such proposal has been patented in the patent to Freeman-No. 2,312,7(l6, patented March 2, 1943.
  • the devices of these two patents both comprise a hydrocyclone characterized in that as a result of pressure on a tangential feed thereto, vortices are said to be set up therein.
  • the liquid body therein is given a vortically spinning movement with inner and outer layers, in which outer layers are segregated coarser or faster settling solids, while in the inner layers are segregated the fine or slower settling solids.
  • the segregated coarse solids discharge through the apex of the conical part of the hydrocyclone of those patents and is called underflow, while the segregated fine solids vortex discharge through a vortex finder in the base of the hydrocyclone of those patents and is called overflow.
  • overflow and underflow do not mean that the hydrocyclone has to be vertical or that the overflow is from the top of the hydrocyclone or that the underflow is from the bottom of the hydrocyclone.
  • Sulficiently high feed pressure is used in feeding the stock tangentially of the cylindrical part of the hydrocyclone so that the liquid in the hydrocyclone is swirled centrifugally with a force significantly in excess of gravity, whereby a hydrocyclone can function horizontally as well as vertically and, indeed, upsidedown.
  • Another object is to combine the centrifugal separators with a stock de-aerator to pass the stock to the de-aerator through hydrocyclones instead of the spray nozzles per se, so that only one set of feed pressures is used instead of two, and yet the stock sprayed into the tie-aerating receiver has already been de-dirted.
  • Hydrocyclones usually have an air core extending axially therethrough, and this air core tends to aerate, or inject air into, liquid suspensions being treated in the hydrocyclone, but since it is the main purpose of this invention both to de-dirt and to de-gasify the stock, it is another object of this invention to combine the hydrocyclones with the de-gasifler or de-aerator under conditions that the normal aerating function of the hydrocyclones is eliminated therefrom.
  • a stock de-aerator of the type of the De Cew patent all the stock to be de-aerated is usually passed through the atomizing spray nozzles of the vacuum treatment receiver.
  • Some of the features of this invention contributing to the realization of these objects include the means whereby the accepted or de-dirted fraction from the centrifugal separator station is atomizingly sprayed directly into the de-aeration station or vacuum receiver, making unnecessary the use of spray nozzles as such; the means whereby relatively thick or high consistency stock can be passed to the tie-aeration station through the centrifugal separator station while stock-diluting liquid can be supplied to that de-aeration station directly, thus by-passing the centrifugal separator station; the means for using the vacuum in the de-aeration receiver or station to help create the diiferential in pressure normally required to pump stock through the hydrocyclones; the means for eliminating airbleed by maintaining the effect of vacuum on the rejected fraction of stock; and the means for re-claiming some of the stock in the primary rejected dirt-rich fraction underflowing from the hydrocyclone station.
  • the rejectable dirt-rich fraction is underflowingly discharged from the centrifugal separator station outside of the deaeration tank and preferably into a header that conducts the rejected fraction to further treatment.
  • the dirt-poor fraction sprayed into the de-aeration tank and collected therein as a pond of de-dirted de-aerated stock is conducted to the head-box of the paper-making machine.
  • New incoming paper-making stock of rather high consistency can be so fractionated and sprayed from the hydrocyclones into the de-aerating tank, and diluting liquid, such as white-water, can by-pass the hydrocyclone station to be sprayed directly thereinto to collect in the pond in the de-aeration tank, there to make up the proper dilution of the de-dirted and de-aerated stock going to the feed end of the paper-making machine.
  • Primary rejected dirt-rich stock in the hydrocyclone-rejected fraction is or can be treated in a primary separator station that is a tank maintained under the influence of vacuum, by being sprayed therein.
  • the vacuum sucks vapors from the top of the tank, and a pump returns sprayed stock from the separator tank back to be re-treated in the deaeration station while still under the influence of vacuum through a secondary hydrocyclone station which again fractionates this stock into an acceptable de-dirted fraction ultimately sprayed into the de-aeration station wherein it falls into the pond in which it commingles with the acceptable stock fraction sprayed from the primary hydrocyclone station. From the secondary hydrocyclone station there is also emitted a rejectable dirt-rich fraction conducted from the underflow of the secondary hydrocyclone station and thereupon is conducted to discard through a barometric drop leg.
  • Fig. 1 shows a flow-sheet of the Ways and means for removing dirt and gas from paper-making solids, as practiced by this invention.
  • Fig. 2 is a vertical sectional transverse view, with parts in section, along the lines 2-2 in Fig. 1.
  • Fig. 3 is a vertical sectional view through the expansion chamber 42 in Fig. 2.
  • Fig. 4 is a partial view like that of Fig. 1, of a modification.
  • 11 indicates an enclosed vacuuminfluenced de-aerating or de-gasifying tank, in which a suspension of paper-making solids is to be atomizingly sprayed to de-aerate or de-gasify it, wherein there is adapted to be collected a pond or pool 12 of de-aerated stock Whose liquid-level 13 is maintained constant under the control of a standard level transmitter device 14.
  • De-aerated stock is conducted from the tank 11, sometimes referred to as the receiver, while air is substantially excluded therefrom, through a pipe-line or conduit 15, by means such as the fan pump or centrifugal pump 16, from whence it is conducted through pipe-line 17 having a headbox control valve 18 therein, to a headbox 19 of a paper-making machine. From the headbox, stock therefrom is delivered to the usual wire 20.
  • 21 represents the usual machine room floor in a paper mill, and 22 the wire pit of the papermaking machine.
  • White water is drawn from the Wire pit 22 through conduit 23 by centrifugal mixing pump 24, usually on the basement floor 29, which also draws up new papermaking stock through pipe 25 to mix it with white Water from pipe 23, forces the so-diluted stock through conduit 26, through automatic flow-control valve 27 that is influenced or controlled by the level-transmitter 14 to maintain a constant liquid-level 13 on the pond of deaerated stock in the tank 11.
  • Conduit 26 delivers the stock to be treated into a stock header pipe 28 that is adapted to supply the stock of paper-making solids in suspension, to a de-dirting centrifugal segregator or separator station indicated generally by H, while the de-aeration station is indicated generally by D.
  • the de-aerating tank or receiver 11 is maintained under the influence or which most of the dirt is concentrated, but under conditions whereby at least the dirt-poor fraction is forcefully sprayed from its outlet in the segregator in significantly discontinuous liquid phase. This seems to involve vortical spinning of the liquid within the segregator to set up therein centrifugal action having a force much greater than gravity whereby the faster settling solids are segregated in the outer layers while the slower settling solids are segregated in the inner layers.
  • the dirt-rich fraction is in the outer layers while the dirt-poor fraction is in the inner layers.
  • the dirt-poor fraction issues through one outlet from the segregator, usually an axial outlet, while the dirt-rich fraction issues through another outlet.
  • a general type of such device is now known as a hydrocyclone, and this type is exemplified by the patents to Samson et al. No. 2,377,524, and to Freeman, No. 2,312,706, of which the hydrocyclone of the Samson patent is at present the preferred one in which to practice the de-dirting part of this invention.
  • a typical hydrocyclone of this type is shown in Fig. 2, wherein one of the hydrocyclones of the hydrocyclone station H is shown in vertical section, Whereas its twin is not.
  • Each hydrocyclone selected as illustrative of the centrifugal segregation used in the practice of this invention such as 31 comprises a cylindrical part or section 32 subtended by a conical part of section 33, having an apex outlet 34.
  • the cylindrical section is closed by a base 35 having a base-outlet 36 through which passes a pipe 37, usually called a vortex-finder. 38 indicates a pipe that is a continuation of the vortex-finder that may or may not terminate in an elbow 39. If the latter is used, it is for the purpose of emitting the centrifugally and forcefully sprayed discharge from the hydrocyclone at an angle thereto of less than 180. In the instance shown, the spray is emitted at a right angle to the axis of the hydrocyclone 31.
  • the centrifugally sprayed base discharge from the hydrocyclone 31 containing the ac- ,I ⁇ ceptable dirt-poor fraction is sprayed against an impingement plate 40 supported within the receiver tank 11 and extending at substantially right angles to the axis of the emitted spray.
  • the impingement plate preferably has a reinforcing bottom flange 41.
  • the emitted spray from the elbow 39 is a forcefully whirling spiralling mass of discontinuous liquid phase droplets ejected from the elbow at velocity high enough to impinge them with considerable impact against the plate for further comminuting the droplets so that the liquid so projected into the tank 11 is in the form of an atomized spray much like a fog or mist.
  • the discharge through the apex 34 contains the rejectable dirt-rich fraction and it is sprayingly emitted into an expansion chamber or box 42.
  • the sprayed liquid suspension falls to the bottom portion of 3 the chamber from whence it is flowed away through a pipe 43 while from the upper section of the chamber is a pipe 44 through which vapors flow since it is connected to vacuum header or line 30 leading to the source of vacuum or vacuum producer VP.
  • the pipe 44 is valved at 45 for regulating the vacuum effective on the chamber 42 and the apex 34 of the hydrocyclone.
  • the liquid outlet pipe 43 is also valved, at 46, for regulating the outflow of liquid therefrom.
  • Pipe 43 connects with rejects header or pipe 47, leading the rejected dirt-rich fraction to further treatment.
  • the expansion chamber or box 42 is designed so that the liquid is taken off through pipe 43 below the apex outlet of the hydrocyclone in order to keep that outlet from becoming submerged in its own emitted liquid.
  • Stock from the feed header 28 is drawn olf through pipe 48 valved at 49, to control the feed of stock therethrough to the tangential inlet pipe 50 inletting to the cylindrical section 32 of the hydrocyclone 31.
  • Stock to be de-dirted is forced through the tangential feed pipe 50 with sufficient pressure to set up in the liquid body of stock within the hydrocyclone 31 a vertical spinning of that body by a centrifugal force greater than gravity for the dual purpose of maintaining centrifugal segregating effects (1) to yield the dirt-rich fraction in the outer vortex and the dirt-poor fraction in the inner vortex, and (2) to make it possible to use the hydrocyclone in an upside-down position.
  • the infeed pressure on the stock entering the tangential feed pipe 50 from the stock header 28 comes from pump 24 through stock-line pipe 26.
  • Normally such pressure supplied by the pump 24 would be of the order of 40 p. s. i. g. but it is to be noticed that in this case both outlets from the hydrocyclone 31 are under the influence of vacuum. Therefore, only about 27 to 29 p. s. i. g. pressure or less has to be used to get the same centrifugal segregating effect as it would if these outlets were open to the atmosphere.
  • the degree of vacuum acting within the de-aerating receiver or tank 11, is normally in accordance with the teaching of the patent to Clark et al., No.
  • rejects header 47 are conducted through pipe 51 and sprayed into a primary separator tank 52, whose top is connected with line 53, valved at 54, with main vacuum line 30, while its bottom is connected by pipe 55 to a primary rejects fan or centrifugal pump 56 that pumps the rejects up pipe 57, valved at 60, through the tangential feed inlet pipe 58 of a secondary hydrocyclone station indicated generally by the numeral 131 functioning like the other hydrocyclone station.
  • the segregated dirt-poor fraction is discharged through base outlet 136 through pipe 58 to be returned to conduit 23 in which is the incoming stock to be initially treated, so this secondary accepted dirt-poor fraction from the secondary hydrocyclone station 131 is mingled by the mix pump 24, and
  • rejects flowing through pipe 51 into the primary separator 52 are under the influence of vacuum so the rejects are in effect sucked into the separator 52 as a spray.
  • this mixing pump 24 mixes only incoming through the de-dirting and dethick raw stock from pipe 25 and recirculating secondary acceptable stock from pipe 58, which mixture is then supplied through pipe 26 to de-dirting and de-aerating treatment through stock feed header 28 and the primary hydrocyclone station H.
  • Diluting water either as such, or a very dilute suspension of paper-making solids, such as white water from the wire pit 22, is supplied through pipe 61, to a fan or centrifugal pump 62, which pumps it through pipe 63 to diluting water header 64 through control valve 27' that is controlled by the level-transmitter 14 for maintaining constant the liquid-level 13 in the tank 11.
  • the level-transmitter 14 may control either or both of the automatic control valve 27 in the stock flow conduit 26 in Fig. 1, or the automatic control valve 27' in the diluting water pipe 63 in Fig. 4.
  • the water is fed through pipes 65 into the tank 11 where each terminates in an atomizing spray nozzle 66 that sprays the water as mist into the atmosphere of the tank 11 so that it is de-aerated, whereupon it falls to collect in the pond 12 of de-dirted and deaerated thick stock, in which pond the thicker stock is thus diluted with de-aerated diluting water that has not been passed through the de-dirting hydrocyclone station.
  • New stock to be made into paper, or other such sheeted material comes in for treatment through pipe 25, to be mixed in pump 24 with diluting white-water coming from the wire pit 22 through pipe 23.
  • This dilute suspension of paper-making solids is forced through pipe 26 and stock feed header 28 to enter the hydrocyclone station H and its centrifugal segregators or hydrocyclones 31 through the latters tangential feed pipes 50 with sutficient pressure to give the liquid body of suspension in the hydrocyclones a vertically spinning or spiralling movement with inner and outer layers in which outer layers are segregated coarser or faster settling solids into a dirtwil rich fraction of the suspension, while in the inner layers are segregated slower or fine settling solids into a dirtpoor fraction of the suspension.
  • the dirt-rich or rejectable fraction of the suspension is sprayed out through the apex outlet 34 of the hydrocyclone while under the influence of vacuum through pipe 44 from the line 30, into an expansion chamber or box 42 from whence it passes through pipe 43 to further treatment.
  • the acceptable dirt-poor fraction of the suspension is then forced from the base outlet 36 of the hydrocyclone 33 by the centrifugal action in the hydrocyclone, to pass through pipe 38 and elbow 39 to be spirally and atomizingly sprayed into the de-aeration tank 11, preferably against an impingement plate 40 for further atomizing the fraction entering the de-aeration tank 11, since in order to get good de-aeration the entering suspension must be finely divided like a fog or mist.
  • This tank is under the influence of vacuum through line 30 leading to a vacuum-producer VP, and it has a pond 12 of de-aerated de-dirted stock in it whose liquid-level 13 is maintained constant by operation of a level-transmitter mechanism 14 that influences automatic valve 27 that controls the quantity of stock fed through pipe 26 and header 28 to the hydrocyclones.
  • the sprayed stock from which first dirt and then gas has been removed falls or rains to collect in the pond 12 thereof from whence such stock is drawn through pipe 15 by pump 16 and conducted through pipe 17 to the feed end of a paper-making machine, such as the headbox 19.
  • the rejectable dirt-rich fraction segregated in the hydrocyclone station H, in the individual hydrocyclones 31, is discharged from the apex outlets 34 thereof into the expansion chambers 42 while under the influence of vacuum from line 30 and pipes 44 so that both discharges from the hydrocyclones are thus under the effect of vacuum so that the usual air core formed in and by such hydrocyclones is absent.
  • This is important in this case because that air core has an aerating effect, and one of the functions of this invention is to de-aerate the papermaking stock.
  • the expansion chamber or box 42 is tall enough, and the apex 34 of the hydrocyclone enters it sufhciently, so that the apex is not normally submerged by the emitted suspension.
  • suspension take-off pipe 43 is shown to be from the bottom portion of the chamber and again, it preferably inclines downwardly. Vapors are sucked from the emitted suspension in the chamber 42, as a result of vacuum being effective thereon through the pipe 44 leading to the vacuum line 30.
  • the rejected, dirt-rich fraction discharge through the apex of the hydrocyclones is collected in reject header 47 and conducted through pipe 51 to a primary separator tank 52 which also is under the effect of vacuum through valve-controlled pipe 53 leading to the main vacuum line 39.
  • the rejected fraction of stock 1 is sucked into the tank by means of that vacuum coupled with the centrifugally swirling impulse the fraction gets as it is discharged from the apex 34 of the hydrocyclone into the expansion chamber 42.
  • Valves such as and 54 are shown to enable this relationship to be effected by proper adjustment. Vapors are sucked from the top of the separator tank 52, and the fluid suspension falls down pipe 55 to encounter pump 56 that feeds it to tangential inlet pipe 58 of the secondary hydrocyclone station 131, wherein the suspension so tangentially fed is further fractionated into a secondary dirt-rich fraction and a secondary dirt-poor fractionv
  • the secondary acceptable dirt-poor fraction passes out through the base outlet 136 of the secondary hydrocyclone to be conducted through pipe 58 to be mixed with the incoming new stock in mixing pump 24 to be thus recycled to the deaerating tank 11.
  • the secondary rejectable fraction passes out through the apex outlet 134 of the secondary hydrocyclone and then through drop-leg 59 and sealbox 67 passes to discharge to the atmosphere.
  • a major feature of this invention is spraying into the paper-stock de-aerating station of the type shown and described in the patent to Clark et al, No. 2,614,656, directly from a suspended solids fractionating centrifugal segregator and While subject to the effect of vacuum during such segregation, the segregated dirt-poor fraction in discontinuous liquid phase with such centrifugally swirled force that that fraction is in substantially atomized condition or that is so atomized upon impinging on an impingement plate.
  • the treatment has been described as applied to paper-making stock of the type used on a Fourdrinier machine, the invention is capable of being applied to the treatment of higher consistency wood or other pulps of the type that may not go onto a Fourdrinier machine but be used in other types of sheeted material including boards.
  • a hydrocyclone has is meant any centrifugal segregator whose dirt-poor fraction is emitted in discontinuous liquid phase which when impinged on or against an impingement surface becomes an atomized spray of the nature of a fog or mist.
  • the continuous process for simultaneously segregating a liquid suspension of paper-making solids into one primary rejectable dirt-rich fraction and one primary acceptable dirt-poor de-aerated fraction which comprises regulatably maintaining a main enclosed zone under the effect of de-aerating vacuum, collecting as a pond therein a quantity of the acceptable dirt-poor de-aerated fraction, conducting such fraction from the pond to a paper-making machine, maintaining a plurality of hydrocyclone casings each having a cylindrical base section subtending a conical section with two aligned axial outlets, passing a different hydrocyclone-discharge through the outlets of each casing of which one is in the apex while the other is in the base with the discharge through the base outlet being within the enclosed zone and under the influence of vacuum therein, conducting the discharge from the apex under substantially air-excluding conditions, feeding the treatable suspension tangentially into the cylindrical section of the hydrocyclones, and based upon the degree of vacuum used in the vacuum zone regulatably swirling the suspension with sufficient
  • Apparatus for continuously producing a de-dirted and de-aerated suspension of paper-making solids having a stock receiving and de-aerating tank adapted to hold therein a pond of such suspension; vacuum-producing means for applying the effect of vacuum to the tank; means for removing treated stock from the pond thereof in the tank; and means for supplying de-dirted stock while under vacuum into the tank to be de-aerated therein which com prises means for centrifugally segregating dirt-bearing and air-bearing suspended paper-making solids into a discharging dirt-poor fraction and a discharging dirt-rich fraction, means connected with the vacuum-producer for maintaining the effect of vacuum on both discharging fractions, means for feeding said suspended paper-making solids to the centrifugal means, means for conducting the dirt-rich fraction from the centrifugal means, and means for atomizingly spraying the vacuum-influenced dirt-poor fraction into the atmosphere of the vacuum-influenced deaerating tank.
  • centrifugal means comprises a hydrocyclone having a base section with an axial outlet and a conical section with an apex outlet, and a conduit leading from the base outlet into the tank and from the terminal end of which conduit the dirt-poor fraction is sprayed.
  • Apparatus of the class described having in combination an enclosed de-aerating vacuum-influenced tank, means for conducting treated paper-making stock therefrom under substantially air-excluding conditions, a vacuum producer, a plurality of hydrocyclones associated therewith each having an apex outlet and a base outlet with the base outlets communicating with the interior of the vacuum-influenced tank while the apex outlets communicate with the vacuum producer, and means for pressure-feeding treatable paper-making stock tangentially into the hydrocyclones to atomizingly spray a dirt-poor fraction of paper-making stock from the base outlets and a dirt-rich fraction from the apex outlets.
  • Apparatus according to claim 9 with the addition of a conduit connecting the base outlets with the vacuuminfiuenced tank and terminating at an angle less than 180 from the apex outlet.
  • Apparatus according to claim 9 with the addition of an expansion chamber around the apex outlet, and a pipe leading from the lower section thereof to the vacuum producer.
  • Apparatus for simultaneously segregating a liquid suspension of paper-making solids into one primary rejectable dirt-rich fraction and one primary acceptable dirt-poor de-aerated fraction which comprises an enclosed de-aerating tank, means for maintaining the tank under the effect of de-aerating vacuum, means for discharging from the tank a primary acceptable dirt-poor de-aerated fraction of paper-making suspension, a hydrocyclone station having a plurality of hydrocyclones each having a casing with a cylindrical base section subtend-' ing a conical section and two aligned axial outlets passing hydrocyclone-discharge through the casing of which one is through the apex and one is through the base with the discharge through the base outlet being within the tank and under the influence of vacuum therein, means for passing discharge through the apex outlet under substantially air-excluding conditions, means for conducting treatable suspension into the cylindrical section tangentially, means for spinning such suspension with sufficient pressure to swirl the suspension with a centrifugal force significantly greater than gravity thus effecting
  • Apparatus for continuously producing a stock of de-dirted and de-aerated suspension of paper-making solids comprising a de-aerating tank adapted to hold a pond of such suspension; vacuum-producing means for applying the eifect of vacuum to the tank; means for removing treated stock from the pond thereof in the tank; means for centrifugally segregating dirt-bearing and airbearing suspended paper-making solids into a discharging dirt-poor fraction and a discharging dirt-rich fraction, means connected with the vacuum-producing means for maintaining the efiect of vacuum on both discharging fractions; means for feeding said suspended paper-making solids to the centrifugal means; means for conveying the segregated dirt-rich fraction from the centrifugal means; means for flowing the segregated dirt-poor fraction from the centrifugal means while under the influence of vacuum; and means connected with the latter for atomizingly spraying the segregated dirt-poor fraction into the atmosphere of the vacuum-influenced tank.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Paper (AREA)
US369614A 1952-12-24 1953-07-22 Conditioning paper-making stock Expired - Lifetime US2717536A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US369614A US2717536A (en) 1952-12-24 1953-07-22 Conditioning paper-making stock
GB35076/53A GB755973A (en) 1953-07-22 1953-12-16 Improvements in or relating to the de-aerating and cleaning of paper pulp
DE1954R0013346 DE1038390C2 (de) 1953-07-22 1954-01-15 Verfahren und Anlage zum kontinuierlichen Entgasen und Reinigen von in Fluessigkeit aufgeschwemmter Papiermasse
FI0066/54A FI40265B (de) 1953-07-22 1954-01-20
FR1097654D FR1097654A (fr) 1953-07-22 1954-01-25 Procédé et installation pour désaérer et pour débarrasser de boues une matièrepremière destinée notamment à la fabrication du papier
AT189047D AT189047B (de) 1953-07-22 1954-05-12 Verfahren und Anlage zur kontinuierlichen Vorbehandlung von Papierherstellungsmassen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US327920A US2730510A (en) 1952-12-24 1952-12-24 Drying composition resistant to gas checking and frosting
US369614A US2717536A (en) 1952-12-24 1953-07-22 Conditioning paper-making stock

Publications (1)

Publication Number Publication Date
US2717536A true US2717536A (en) 1955-09-13

Family

ID=23456170

Family Applications (1)

Application Number Title Priority Date Filing Date
US369614A Expired - Lifetime US2717536A (en) 1952-12-24 1953-07-22 Conditioning paper-making stock

Country Status (6)

Country Link
US (1) US2717536A (de)
AT (1) AT189047B (de)
DE (1) DE1038390C2 (de)
FI (1) FI40265B (de)
FR (1) FR1097654A (de)
GB (1) GB755973A (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2858211A (en) * 1956-02-13 1958-10-28 Condi Engineering Corp Apparatus for wood chip digestion
US2877693A (en) * 1957-01-11 1959-03-17 Ernest A Poirier Suction box extraction apparatus
US2931503A (en) * 1953-04-21 1960-04-05 Clark & Vicario Corp Conditioning paper-making stock
US2991646A (en) * 1956-09-20 1961-07-11 Phillips Petroleum Co Sampling system for a process analyzer
DE1155970B (de) * 1958-10-15 1963-10-17 Bauer Bros Co Stoffmuehle fuer Papierstoff
US3235090A (en) * 1961-12-15 1966-02-15 Univ Oklahoma State Hydroclones
US3237763A (en) * 1962-07-06 1966-03-01 Wikdahl Nils Anders Lennart Method and apparatus for concentrating fibrous suspensions
US3294236A (en) * 1965-01-28 1966-12-27 American Instr Co Inc Method for pneumatically elutriating solid particles
US3421622A (en) * 1965-08-19 1969-01-14 Nichols Eng & Res Corp Cleaning and deaerating paper pulp suspensions
US3538680A (en) * 1967-12-29 1970-11-10 Clark & Vicario Corp Papermaking apparatus and process
DE2312618A1 (de) * 1972-03-16 1973-09-27 Klas Robert William Robinson Suspensions-reinigungseinheit
US4197193A (en) * 1975-10-21 1980-04-08 J. M. Voith Gmbh Apparatus for classifying the constituents of dilute suspensions of fibers
DE3211784C1 (de) * 1982-03-30 1983-11-03 Kraftwerk Union AG, 4330 Mülheim Einrichtung zum Entwaessern von Dampf in Dampfkraftwerken
US6733629B1 (en) * 1999-08-23 2004-05-11 Andritz Oy Method of controlling the operation of an approach system of a paper machine or the like web formation apparatus

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1078998B (de) * 1957-05-21 1960-04-07 Heinz Hogenkamp Dipl Phys Mehrstufige Rohrschleuderanlage zum Reinigen, insbesondere von waesserigen Papier- und Zellstoffsuspensionen
DE1293129B (de) * 1959-07-01 1969-04-24 Bauer Bros Company Verfahren und Vorrichtung zur Reinigung von Suspensionen
US3131117A (en) * 1960-03-01 1964-04-28 Clark & Vicario Corp Treating paper-making stock by vacuum deaeration prior to addition of diluting water
DE1229832B (de) * 1961-10-04 1966-12-01 Clark & Vicario Corp Verfahren und Vorrichtung zur im wesentlichen konstanten Zufuehrung von waessrigem Papierstoff-brei in Maschinen zur Papierherstellung
US3206917A (en) * 1961-10-04 1965-09-21 Clark & Vicario Corp Deaerated stock flow control
US3212232A (en) * 1962-04-05 1965-10-19 Black Sivalls & Bryson Inc Method and apparatus for fluid separation
FI63613C (fi) * 1981-06-05 1983-07-11 Enso Gutzeit Oy Anordning foer avlaegsnande av gas fraon pappersmassasuspension
FI122916B (fi) 2007-04-03 2012-08-31 Andritz Oy Laitteisto kaasun poistamiseksi paperikoneen tai vastaavan yhteydessä
RU2711264C1 (ru) * 2016-09-01 2020-01-16 Эссити Хайджин Энд Хелт Актиеболаг Способ и устройство для влажной укладки нетканых материалов

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2346005A (en) * 1940-08-15 1944-04-04 Tandy A Bryson Vortex separator

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2642950A (en) * 1951-11-30 1953-06-23 Rotareaed Corp Deaerating a suspension of cellulosic fibers

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2346005A (en) * 1940-08-15 1944-04-04 Tandy A Bryson Vortex separator

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2931503A (en) * 1953-04-21 1960-04-05 Clark & Vicario Corp Conditioning paper-making stock
US2858211A (en) * 1956-02-13 1958-10-28 Condi Engineering Corp Apparatus for wood chip digestion
US2991646A (en) * 1956-09-20 1961-07-11 Phillips Petroleum Co Sampling system for a process analyzer
US2877693A (en) * 1957-01-11 1959-03-17 Ernest A Poirier Suction box extraction apparatus
DE1155970B (de) * 1958-10-15 1963-10-17 Bauer Bros Co Stoffmuehle fuer Papierstoff
US3235090A (en) * 1961-12-15 1966-02-15 Univ Oklahoma State Hydroclones
US3237763A (en) * 1962-07-06 1966-03-01 Wikdahl Nils Anders Lennart Method and apparatus for concentrating fibrous suspensions
US3294236A (en) * 1965-01-28 1966-12-27 American Instr Co Inc Method for pneumatically elutriating solid particles
US3421622A (en) * 1965-08-19 1969-01-14 Nichols Eng & Res Corp Cleaning and deaerating paper pulp suspensions
US3538680A (en) * 1967-12-29 1970-11-10 Clark & Vicario Corp Papermaking apparatus and process
DE2312618A1 (de) * 1972-03-16 1973-09-27 Klas Robert William Robinson Suspensions-reinigungseinheit
US3862041A (en) * 1972-03-16 1975-01-21 Klas Robert William Robinson Liquid suspension purifying unit
US4197193A (en) * 1975-10-21 1980-04-08 J. M. Voith Gmbh Apparatus for classifying the constituents of dilute suspensions of fibers
DE3211784C1 (de) * 1982-03-30 1983-11-03 Kraftwerk Union AG, 4330 Mülheim Einrichtung zum Entwaessern von Dampf in Dampfkraftwerken
US6733629B1 (en) * 1999-08-23 2004-05-11 Andritz Oy Method of controlling the operation of an approach system of a paper machine or the like web formation apparatus

Also Published As

Publication number Publication date
GB755973A (en) 1956-08-29
FI40265B (de) 1968-07-31
AT189047B (de) 1957-02-25
DE1038390B (de) 1958-09-04
FR1097654A (fr) 1955-07-08
DE1038390C2 (de) 1959-02-19

Similar Documents

Publication Publication Date Title
US2717536A (en) Conditioning paper-making stock
JP5028520B2 (ja) 抄紙機または抄紙機に対応するものに関連する気体を除去する装置
US4186094A (en) Apparatus for eliminating by flotation impurities in the form of solid particles contained in a liquid
US3421622A (en) Cleaning and deaerating paper pulp suspensions
US3432036A (en) Conditioning papermaking stock
US5268077A (en) Apparatus and method for deaerating or degassing a paper stock suspension
US4578199A (en) Cyclone separators
US5529190A (en) Gas sparged hydrocyclone with foam separating vessel
US3833468A (en) System for recovery of fiber from paper mill effluent, including a sieve bend screen
US4704201A (en) Waste paper processing system
EP0424426B1 (de) Vorrichtung und verfahren zur beseitigung von leichtem material aus einer fasersuspension
US3538680A (en) Papermaking apparatus and process
US3331193A (en) Cyclonic separator
US2931503A (en) Conditioning paper-making stock
EP0543866B1 (de) Verfahren und vorrichtung zur stabilisierung und vereinfachung eines stoffverteilers für eine papiermaschine
US3720315A (en) Stabilizing papermaking system cleaner operation
US5240621A (en) Method and apparatus for improving flotation separation
US4070274A (en) Coarse concentrated iron ore for catalytic purposes
US3131117A (en) Treating paper-making stock by vacuum deaeration prior to addition of diluting water
US3494101A (en) Method and apparatus for deaerating liquid suspensions
JPH05200204A (ja) 泡を含む懸濁液の処理装置および方法
US4161395A (en) Foam and liquor separator
US3513971A (en) Continuous method for degasifying and cleaning aqueous suspensions of fibrous materials
KR19990067424A (ko) 오염된 펄프 부유물 처리를 위한 방법 및 설비
US3019901A (en) Vacuum receiver and separator