FI65826C - ANCILLATION OF CELLULOSE CONTAINERS FOR CONTAINING CELLULOSE MATERIAL - Google Patents

Description

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C (4¾ Patent granted 10 07 1934 Patent taeddelat VT ^ (51) Kv.Nk / taaCL3 D 21 C 7/00 FINLAND —FINLAND (21) Ρ »Μη« ΙΗΛ · ΓΓΗΐ »—P« t «ic« * ekj * n 770409 (22) HakMniipaivi —Amttkrtnpdif 08.02.77 (23) ALkupiM — GlkJ | tt «ttdag 08.02.77 (41) TultHt | ulklMk * t - BllvH21.08.77

Patents (44) NlMkvtlulpanon 1 * k »« LMIuiw * pvm. -

Patent- och ragi «terttyralMt> '' Awetow wd ^ d odiutLskrtfce * paNtomd 30.03.84 (32) (33) (31) ttuoikeu» —βπ · »4 prtofk * 20.02.76 USA (US) 659638 (71) Kamyr, Inc., Glens Falls, New York, USA (72) Oliver Armas Valley, Glens Falls, New York, Michael Ignacy Sherman,

Glens Falls, New York, USA (74) Oy Kolster Ab (54) Apparatus and method for capping pulp raw material -Anordning och förfarande för kontinuerlig kokning av Cellulosa-rlmaterial

The invention relates to an apparatus for the flow cooking of pulp raw material chips, having a cylindrical vertical impregnation vessel, the diameter of which is called the first diameter, a filling opening on the container and a discharge opening at the bottom thereof; apparatus for feeding pulp raw material chips and relatively low temperature cooking solution from the filling opening of the impregnation vessel; a cylindrical vertical liquid-filled cooking vessel with a diameter of so-called the second diameter is larger than the first diameter, the impregnating vessel extending through the top of the cooking vessel at a distance concentric with it and the impregnation vessel emptying opening located a predetermined distance below the top of the cooking vessel; a liquid discharge opening located on the cooking vessel rather far from the discharge opening of the impregnation vessel 2 65826 above it and above the fetch column; and an apparatus for emptying the absorbed cellulosic raw material from the bottom of the digester vessel at such a rate that the surface of the pulp remains substantially at the same level as the individual particles of the pulp pass down through the vessel and a method utilizing said apparatus.

The invention therefore relates to a method and apparatus for flowing which does not require the use of screens in the cooking zone. In current plants, clogged strainers in the cooking zone are the biggest causes of downtime steaming. Usually, the solution passes through the screens under high pressure, which often causes the cellulose particles to stick to the surfaces of the screens, and this in turn causes complete blockage of the fluid flow through the screens. Failure to remove such a barrier may result in uneven absorption of the pulp raw material. The raw material processed in modern cookers often contains a lot of leaves, bark, etc., and therefore easily clogs the conventional strainers in the cooking zone.

According to the present invention, it is possible to dispense with the sieves of previously used cookers, cf. e.g., U.S. Patent Nos. 3,007,839, 3,200,032, and 3,298,899, wherein the separation of the solution and the pulp chips occurs in the clarifier section on top of the digester and thus, of course, no vaults due to clogging of the screens occur because the solution effectively separates from the chips.

Specifically, the device according to the invention is characterized in that the area of the emptying opening of the impregnation vessel is approximately 1/4 to 1/3 of the surface area of the cooking vessel and that it has a tube for supplying the cooking solution relatively hot to the pulp raw material mass at a distance from the impregnation vessel. below the discharge opening, the gap being equal to or greater than 1/2 of the second diameter, resulting in an even distribution of the solution without passing the solution along a shortcut to the solution discharge opening at the top of the cooking vessel and devices for removing particles from the mass at the top of the container a solution comprising means of a vertically superimposed pair of screens arranged on the substantially vertical side walls of the cooking vessel above the pulp and below the solution discharge opening, and means for applying suction alternately to each s separately from the sources for drawing the solution from the cooking zone and sieving the particles from the solution, which particles are adapted to return to the pulp and that the substantially chips-free solution is adapted to flow from the solution discharge opening located at the top of the cooking vessel without screening.

The method according to the invention is in turn characterized in that the cooking solution is fed to the chips at a relatively high temperature at a distance below the emptying opening of the impregnating vessel, the distance being equal to or greater than 1/2 the diameter of the cooking vessel, preventing the solution from passing by a shortcut. and that any particles entrained with the solution above the casserole are separated as the solution flows from the casserole to the discharge opening at the top of the cooking vessel by alternately applying suction to one of the two screens placed between the top surface of the casserole and the discharge opening.

The broth supply opening must therefore be sufficiently below the edge of the wall of the impregnation zone, so that the heated solution is evenly and sufficiently distributed in its application, since a liquid flow is created opposite to the downward transition direction of the chips. This usually requires that the broth supply port be located at least at a distance from the brew radius of the impregnation zone wall. Hakapass acts effectively as a heat distributor.

As the chips move downward from the impregnation zone to the cooking zone, due to the increase in the diameter of the tank, it generally tends to flow circumferentially and downwards and to form a generally conical peak above the surface of the cooking zone. This conical surface separates the solution flowing slowly through it (approx. 150 cm / min) (since a speed of approx. 1500 cm / min would be necessary for the chips to travel with the solution as it flows upwards) from the chips and thus forms a clarification zone at the top of the cooking zone. above the bottom of the vessel in the impregnation zone. Because the chips are already separated from the solution when it reaches the drain holes, no strainers are needed for these drain holes above the cooking zone.

In addition to being an advantage of the present invention, screenlessness also provides lower compaction and freer movement of the digester / chips, which in turn provides excellent countercurrent washing in the washing zone and facilitates cleaning of the 65826 screens therein. Even if screenless washing is used in a separate zone, there is certainly no need for it, as washing in the bed itself is practical and reduces the risk of clogging the screens in the washing zone.

The primary object of the present invention is to facilitate the pulp cooking process without the use of screens in the cooking solution cycle. This and other objects of the invention will become apparent upon consideration of the detailed description provided by way of example in the drawing and the appended claims.

The drawing is a schematic diagram of an exemplary casserole according to the present invention having a screenless cooking zone.

Numeral 10 shows in outline the canister according to the present invention and related devices. The apparatus 10 comprises a conventional steaming vessel or the like, from which wood chips or the like pulp raw material is fed from a filling hopper 14, which may contain a feed screw. The filling hopper 14 supplies the cooking solution with the cooking solution from the belt conveyor 13 or the like to the first zone A of the digester, the impregnation zone, where the cooking solution is absorbed into the cellulose at a relatively low temperature. The impregnation zone is bounded by a cylindrical vessel 16 with a diameter of D. It is recommended that the vessel 16 taper slightly vertically, whereby e.g. the diameter may be 270 cm at the top and 285 cm at the bottom, such tapering facilitating the downward movement of the chips. The diameter D of the impregnation zone vessel 16 is smaller than the diameter of the impregnation zones of a conventional flux, the dimension of this vessel is also longer. The lower part 18 of the vessel 16 extends downwards into the cooking zone B of the gap F, the bottom of the lower part 18 being below the solution discharge openings 24 in the cooking zone B, as will be explained below.

The cooking zone B and the associated treatment zone C are bounded by a vessel 20 having a diameter E substantially larger than the diameter D of the impregnation zone vessel 16. It is recommended that the diameters D and E be selected so that the cross-sectional area of the vessel 20 is 3-4 times larger than the vessel. 16 cross-sectional area. One or more hot cooking solution discharge ports 24 are located on the lid 22 of the vessel 20. The spent cooking solution, which is driven by the pressure in the vessel 20 through the discharge ports 24, can be circulated by a recirculation pump 26 through a heater 28 or the like and otherwise recycled back to the digester for processing other pulp. The hot cooking solution supply openings 65826 may be of any suitable construction, such as conventional concentric supply pipes 30, 32 coming from the cooking liquid tank 29. The regenerated cooking solution drained from the drain openings 24 may be fed back through the supply pipes 30, 32.

It has been found that in order to achieve a proper heat distribution and distribution of the cooking liquor, the cooking solution coming through the tubes 30, 32, etc. must be fed to the digester at a J-distance from the bottom of the vessel 16, the J-gap being at least 1/2 E (i.e. at least 20 radii of the vessel). It is best found that if E is 450 cm, Jsn should be about 360 cm or about 80% of E. The supply of cooking solution from points 33, 34 of the pipes 30, 32 also ensures that no passage of cooking solution along the shortcut occurs, i.e. so that the solution does not bypass the fetch G and go directly to the discharge openings 24; a flow of broth opposite to that sought is generated.

As the pulp chip or the like passes down through the impregnation zone A to the cooking zone B, it forms a pulp G which is relatively high from the center of the feed point of the vessel 16 to the zone B and tapers downwards in each direction. The solution can pass through the surface of the pulp G while the chips remain in place in the formation G. The area H above the pulp G in the vessel 20, generally the same length as the part 18 of the vessel 16, acts as a clarifying device or stilling well. The diameters D and E and the amount of cooking solution entering the vessel 20 are dimensioned so that the flow rate of the solution through the retrieval G towards the discharge openings 24 is about 150 cm / min, whereby the speed required to transport the chip compartment with the solution and move them up is about 1500 cm / min. This slow speed also ensures even absorption of the chips. Therefore, very little wood chips with the solution move upwards past the upper surface of the pulp G to the area H and therefore no sieves are needed in the discharge openings 24.

To further ensure that any pulp particles that pass with the fluid flow through the retrieval G toward the discharge ports 24 can be removed before passing through the discharge ports 24, a pair of screens 36, 38 are positioned on the vertical walls of the vessel 20 adjacent the top surface of the vessel 20 in accordance with the present invention. Each of the screens 36, 38 is vertically spaced apart and connected to a different suction tube 40, 42. Tube 40 connects screen 36 and suction pump 44, while tube 42 connects screen 38 and suction pump 46. Suction is initiated alternately by controlling pumps 44, 46 with a suitable central control device 48. the suction is directed at the screen 36, no 6 65826 no suction is applied to the screen 38 and vice versa. When the suction is applied to one of the screens 36, 38, some solution passes through it and the particles accompanying the solution are drawn onto the surface of the screen.

Then, when the suction on the sieve ceases, the particles on the surface of the sieve fall downwards back into the set of G sought. In this way, neither of the screens 36, 38 is blocked, because the suction is applied to them only from time to time and only for a short time at a time. The screens are also not in contact with the retrieval G, and therefore the tendency of the screens to become clogged is even more significantly reduced.

Although the drawing shows that the adjustment of the suction through the screens 36, 38 takes place by adjusting the pumps 44, 46, such an adjustment can be achieved in other ways as well. For example, one suction pump can be provided and the valves in the tubes 40, 42 alternately adjusted to connect this single suction pump to the screens 36, 38. The solution exiting the screens 36, 38 can of course be recirculated to the supply tubes 30, 32 via the tube 47 and of course an additional heater or the like. to regenerate the cooking solution before recycling it back to the digester.

According to the present invention, during impregnation in the casserole, the individual particles of fetch C pass down through the cooking zone B in the vessel 20 and possibly enter other treatment zones C (for washing, further cooking, etc.) and possibly emptied through a conventional discharge opening 58 in the vessel 20. , whereby a conventional scraper 56 facilitates the outward movement of the impregnated chips. Strainers can be provided in the washing zone C if desired (of course, the points 33, 34 of the tubes 30, 32 must be located quite above the screens 54 so that the broth in no case flows from the tubes through the screens 54), and the screens 54 have less chance of clogging. less packing and freer movement, with countercurrent washing improving in zone C, and freer movement because the less dense chopper G tends to scrape the screens 54 clean as the chips move downward in chopper G. Washing or impregnations in zone C are conventional, e.g., U.S. Pat. . After the absorbed chips leave the container 20, it may pass through a pulp pit 60 or the like, or it may otherwise be absorbed in a conventional manner. In addition, if desired, a plurality of surface controls 62 may be used to indicate tightness.

The operation of the apparatus according to the present invention takes place as follows: Pulp raw material, e.g. wood chips or the like, is fed to the feeder filling device 14 from the evaporator 12, and a first batch of conventional cooking solution is fed to the filling device 14 via a pipe 13 at a relatively low temperature. The chip solution mixture passes through impregnation zone A, characterized by a vessel 16 having a diameter D, which in turn is relatively smaller than the diameter of the impregnation zones of conventional digesters, and extending along the length Fsn to the vessel 20 , 34, etc., located at a distance J below the bottom of the vessel 16, and flows upwardly through the portions of the retrieval G to the discharge openings 24 located on the vessel 20. The amount and flow rate of the solution fed to the vessel 20 and the relative diameters D, E of the vessels 16, 18 are adjusted so that the solution moves upwards at a sufficiently low rate to carry very little wood chips with the top H of the vessel 20 acting as a clarifier or still. , and therefore no screens are required for the drain holes 24. To separate any possible chips that may have migrated with the fluid flow towards the drain holes 24 in the portion H above the retrieval G, a pair of alternating screens 36, 38 above the surface of the retrieval G 24 may be obtained. . After impregnation in the impregnation zone B, the individual chips of the fetched G pass down through the flotation vessel 20 and are further impregnated according to conventional practice, and finally the impregnated chips are emptied through the chip evacuation opening 58 in the bottom of the vessel 20.

Although the invention has been described and illustrated herein on the basis of the most contemplated and preferred embodiment, it will be apparent to those of ordinary skill in the art that many modifications may be made within its scope, and the scope of the invention is to be encompassed by all broader claims. and methods.

Claims (8)

8 65826 Claims p An apparatus for flowing pulp of pulp raw material, comprising a cylindrical vertical impregnation vessel (16), the diameter (D) of which is designated as the first diameter, a filling opening on top of the container and a discharge opening at the bottom thereof; apparatus (13,14) for feeding the pulp raw material and the relatively low temperature cooking solution from the filling opening of the impregnation vessel; a cylindrical vertical liquid-filled cooking vessel (20) with a diameter (E), the so-called the second diameter is larger than the first diameter, the impregnation vessel (16) extending through the top of the cooking vessel concentrically and at a certain distance so that the impregnation vessel emptying opening is located at a certain distance (F) below the below the drain hole; a liquid discharge opening (24) located on the cooking vessel quite distant from the discharge opening of the impregnation vessel above it and above the fetch column; and an apparatus (56, 58) for emptying the impregnated pulp raw material from the bottom of the cooking vessel at such a rate that the surface of the pulp remains substantially at the same level as the individual particles of pulp move down through the vessel, characterized in that the impregnation vessel (16) has an area of approximately 1/4 1/3 of the surface area of the cooking vessel (20), and that it has a tube (30, 32 for supplying the cooking solution relatively hot to the pulp stock at a distance (J) below the emptying opening of the impregnation vessel, the gap (J) being equal to or greater than 1/2 of the second diameter (E), resulting in an even distribution of the solution without passing the solution along a shortcut to the solution discharge port (24) located at the upper end of the cooking vessel, and devices for removing particles from the pulp to the emptying port at the top of the cooking vessel; the devices comprise vertically superimposed a pair of hand-arranged screens (36,38) arranged on substantially vertical side walls of the cooking vessel above the pulp and below the solution discharge port, and means (44,46) for alternately applying suction to each of the screens separately to draw solution from the cooking zone (B) and particles, adapted to return to the pulp and that substantially 9 65826 chips-clean solution is adapted to flow from the solution discharge opening located at the top of the cooking vessel without screening. Apparatus according to claim 1, characterized in that it comprises a circulating pump (26) and a heater (28) operatively connected to the solution discharge opening (24) on the cooking vessel (20) and to the cooking solution of the tube (30, 32). to feed it into the pulp feed pulp among the points (33,34) adjacent the discharge opening of the impregnation vessel (16). Apparatus according to claim 1, characterized in that the pipe (30, 32) for supplying the cooking liquid to the pulp raw material application mass is concentric with the impregnation vessel (16). Apparatus according to claim 1, characterized in that there is also a washing zone (C) inside the cooking vessel (20). A method of flowing a cellulosic raw material in an apparatus according to claim 1, comprising the steps of supplying cooking liquid at a relatively low temperature to the impregnation vessel (16) from above, feeding the chip solution mixture from the impregnation vessel to the cooking vessel (20) through the impregnation vessel outlet, emptying the solution from the cooking vessel through the solution discharge opening (24), and emptying the absorbed cellulosic raw material from the lower end of the cooking vessel at such a rate that the surface of the pulp remains practically at the same level as the individual particles passing down through the vessel, characterized in that the cooking solution is fed at a relatively high temperature at a distance (J) below the emptying opening of the impregnation vessel, the gap (J) being equal to or greater than 1/2 of the diameter (D) of the cooking vessel, which prevents the solution from passing by a shortcut to the upper end of the cooking vessel; and that any particles entrained in the solution above the pulp are separated as the solution flows from the pulp to the discharge opening at the top of the cooking vessel by alternately applying suction from one of the two screens between the top of the pulp and the discharge opening (24). to the screen. Method according to Claim 5, characterized in that the chips are washed in the digester after it has passed through the cooking zone (B) of the cooking vessel (20) to the washing zone (C). 65826 10 1. Anording for a continuous pulp of a cellulosic material material, having a cylindrical vertically impregnating spindle (16), a diameter (D) of a core and a diameter having an inlet end and an end (13, 14) incorporation of cellulosic materials into the cell and relative to the temperature lag of the genomic impregnation cells in the end; that cylindriskt vertically stäende vtskefyllt kokkärl (20), stem diameter (E), en sk. andra diameter, the diameter of the diameter, Medan impregnation tips (16) sträcker sig genom kokkärlets topp concentric with decamma and head for the best way forward, the impregnation tips end up the inner head for the best way (F) under the box top, account kokkärlet via impregneringskärlets utlopp bildar en flis-pulakolonn i kokkärlet under impregneringskärlets utlopp; ett vätske-utlopp (24), vilket befinner sig pä kokkärlet, rätt längt ifrän impregneringskärlets utlopp, ovanför detsamma samt ovanför flismassa-kolonnen; och en anordning (56, 58) för uttömning av ett behandlat cellulosarämaterial frän kokkärlets botten med en sädan hastighet, att flismassans yta väsentligen stannar pä samma nivä, Medan massans enstaka partiklar rör sig nedät genom kärlet, Känneteck-n ad dean utilizing the impregnation pellets (16) in an amount of 1/4 to 1/3 of the pellets (20) area, and up to the detergent and pellets (30, 32) for heating with a relative temperature and in the cellulosic material mass at the point where the finisher sig pä ett avständ (J) nedanför impregneringskärlets utlopp, varvid avstän-det (J) är lika stort eller större än 1/2 av den andra diametern (E), varvid resultat blir en jämn fördelning av Luten i flismassan utan att Luten circuler via genvägar account utloppet (24) för Luten, vilket utlopp befinner sig i kokkärlets Övre ände, samt anordningar för av-lägsnande av particle frän Luten som är päg frän massan account utloppet i kokkärlets ovandel, vilka anordningar omfattar ett vertikal T över varandra anordnat silpar (36, 38), vilka Silar anordnats pä kokkärlets väsentligen vertikala sidoväggar, ovanför massan nedanför utloppet för Luten och anordningar (44, 46) för riktning av ett sug turvis päen fren för dragning av B) and for the purpose of particulate matter from Luten, a single particulate matter from Luten, a single particle of the anthrax in the form of a genome