SE190983C1

SE190983C1 -

Info

Publication number: SE190983C1
Authority: SE
Publication date: 1964-01-01

Description

Uppfinnare: W Hampel Prior/let begard fran den 24 juni 1954 (Forbundsrepubliken Tyskland) Foreliggande uppf inning avser en anordning for avluftning av fiberuppslamningar Mom tramasse-, cellulosa-, pappersindustrin eller liknande, bestaende av en vakuumkammare for avsugning av den i fiberuppslamningen inneslutna luften och en del av sjalva fiberuppslamningen. Inventor: W Hampel Prior / let begard of 24 June 1954 (Federal Republic of Germany) The present invention relates to a device for deaeration of fiber slurries Mom tramasse, cellulose, paper industry or the like, consisting of a vacuum chamber for suction of the air enclosed in the fiber slurry and part of the fiber slurry itself.

Den i fiberuppslamningar ingaende luften inverkar ofordelaktigt vid framstallning av papper. Man har darfor fOrsokt att avlfigsna de sma luftblasorna fran fiberuppslamningen genom vakuuminverkan. Darvid Midas det emellertid skum pa ytan av fiberuppslamningen. Da detta torkar in, uppsthr torkade skumpartiklar i fiberuppslamningen, som ii- kas5. forsamrar kvaliteten hos papperet. The air entering the fiber slurries has an adverse effect on the production of paper. Attempts have therefore been made to remove the small air bubbles from the fiber slurry by vacuum action. In this case, however, there is foam on the surface of the fiber slurry. As this dries in, dried foam particles form in the fiber slurry, which ii- kas5. degrades the quality of the paper.

Vid de kanda anordningarna astadkommes vakuum genom bortsugning av luften i den Over vatskeytan befintliga luftkudden genom ett ror fran vakuumbehallarens hogsta punkt. Detta fir mojligt vid vissa slags suspensioner, som icke bilda nagot stabilt skum. Vid den i pappersframstallningen fOrekommande fiberuppslamningen uppstar dock i regel vid luftblasornas uppstigande till ytan ett sh segt och stabilt skum, att det icke ens genom inverkan av ett kraftigt vakuum kan utplanas. Foljden fir, att det i detta fall Over vatskeytan byggs upp ett alltmer tilltagande skikt av ett dylikt segt skum. Nar detta uppnar vakuumrorets mynning, kommer visserligen en del av detta skum att uppsugas, men den storsta delen av utrymmet Over vatskan forblir dock fylld med stagnerat skum, som med tiden torkar och bildar skorpor, som sedan medfores fiberuppslamningen som ytterst storande fororeningar. In the known devices vacuum is created by sucking out the air in the air cushion present above the water surface through a tube from the highest point of the vacuum container. This is possible with certain types of suspensions which do not form any stable foam. In the case of the fiber slurry present in the papermaking, however, as the air bubbles rise to the surface, a soft and stable foam usually arises, that it cannot be flattened even by the action of a strong vacuum. The consequence is that in this case an increasingly increasing layer of such a tough foam is built up over the water surface. When this reaches the mouth of the vacuum tube, some of this foam will certainly be absorbed, but most of the space above the liquid remains filled with stagnant foam, which over time dries and forms crusts, which are then carried along by the fiber slurry as extremely large contaminants.

For att 'Lisa ovansthende problem har upp- kl. 55 d: 8/01; 55 d: 8/ finningen fatt de i patentanspra.ken angivna kanneteeknen. Pa detta sAtt uppnas att icke endast den utdrivna luften utan ocksa det pa fiberuppslamningen liggande skummet och det Oversta med lull starkt anrikade skiktet av vatskan fores bort. Den anordningen nande fiberamnesstrommen fir alltsa. fri Iran luftblasor och skumskorpor. DA vakuumkammarens vatskeyta genom overlopp at fastlagd kunna regleringsanordningarna f Or konstanthaliande av vakuum bortfalla, vilka anordningar aro erforderliga vid de kanda anlaggningarna. FOrutom hogre kvalitet ph fiberamnesstrommen erhalles alltsa dessutom en hojning av driftsakerheten till en lagre kostnad. Because 'Lisa the above problems have upp- kl. 55 d: 8/01; 55 d: 8 / the finding contains the pitches specified in the patent claim. In this way it is achieved that not only the expelled air but also the foam lying on the fiber slurry and the top layer of water, which is strongly enriched with wool, are removed. The device nande fiber amnesic currents for thus. free Iran air bubbles and foam crusts. The water surface of the vacuum chamber through the overflow that has been determined, the control devices for constant vacuuming can be eliminated, which devices are required at the known systems. In addition to higher quality ph fiber sample flow, an increase in operational reliability is also obtained at a lower cost.

Den bortsugna luft-vatskeblandningen kan efter grovre avluftning aterledas till fiberuppslamningsstrOmmen vid ett stalk fore anordningen. The coarsely aerated-liquid mixture can, after coarse deaeration, be returned to the fiber slurry stream at a stalk before the device.

Bifobade ritningar visa som exempel olika utforingsformer av uppfinningsfOremalet. Fig. 1 visar en anordning enligt uppfinningen inbyggd i inmatningsdelen av en pappersviramaskin. Fig. 2 visar den i anordningen enligt fig. 1 anvanda vibrationsapparaten i. snitt ef- ter linjeni fig. 1. Fig. 3-5 visa olika utforingsformer av vibrationsapparaten i anordningen enligt fig. 1. Fig. 6 at ett snitt efter linj en VI—VI i fig. 5. Fig. 7 visar en. avluftningsanordning, dar vibrationsapparaten fir utformad som en vibrerande mellanvagg. Fig. & fir ett snitt efter linjen VIII—VIII i fig. 7. Fig. 9 visar en annan utfOringsform av avluftningsanordningen med en i vibration forsatt hfilskiva, som vibrationsdon. Fig. 10 ar en planvy av halskivan i anordningen enligt fig. 9. 2— — Fig. 1 visar en massatillfOrselanordning for en viramaskin, varvid massan strommar fran en Ada 1 till en stromningsfordelare 2, frau vilken den kommer till en vakuumkammare 3. Undertrycket i denna kammare astadkommes medelst en pump 4 pa sadant s5.tt, att icke endast den i vakuumladan 3 frigjorda luften utan alien en del av fiberuppslamningen standigt suges av och pressas in i en behallare 5, frau vilken denna avsugna del av uppslamningen genom en rorledning 6 ledes tillbaka till ladan 1. En framre del 7 av mataranordningen ar oppen och bildar med ladan 1 ett kommunicerande lark Stockningen i tillfOrseln av uppslamningen installer sig dad& i motsvarighet till den frail en ranna 8 tillforda massan och till instalining av en avloppslapp g och star icke i nagot direkt fOrhallande till massans av undertrycket betingade hojd i vakuumladan 3. Biphobic drawings show by way of example various embodiments of the object of the invention. Fig. 1 shows a device according to the invention built into the input part of a paper wire machine. Fig. 2 shows the vibration apparatus used in the device according to Fig. 1 in section along the line in Fig. 1. Figs. 3-5 show different embodiments of the vibration apparatus in the apparatus according to Fig. 1. Fig. 6 shows a section along line one. VI — VI in Fig. 5. Fig. 7 shows a. venting device, where the vibrating apparatus is designed as a vibrating intermediate wall. Fig. & Shows a section along the line VIII — VIII in Fig. 7. Fig. 9 shows another embodiment of the deaeration device with a vibrating disc as a vibrating device. Fig. 10 is a plan view of the neck plate of the device according to Fig. 9. Fig. 1 shows a pulp supply device for a wire machine, the pulp flowing from an Ada 1 to a flow distributor 2, from which it arrives at a vacuum chamber 3. The negative pressure in this chamber it is effected by means of a pump 4 in such a way that not only the air released in the vacuum charge 3 but also a part of the fiber slurry is constantly sucked off and pressed into a container 5, from which this suction part of the slurry is passed through a pipeline 6 is led back to the barn 1. A front part 7 of the feeding device is open and forms with the barn 1 a communicating sheet. not in any direct relation to the height of the mass due to the negative pressure in the vacuum charge 3.

F8r forstarkning av luftavskiljningen i vakuumladan 3 Or under massaytan inom zonen f8r vakuuminverkan anordnad en roterande halvals 10, som redan genom sin rotation forsatter fiberuppslamningen i en viss vibration. Valsen 10 drives enligt fig. 2 med en motor 11. Genom en vibrator 12 bibringas den dessutom vibrationer i axiell riktning. To reinforce the air separation in the vacuum charge 3 Or below the pulp surface within the zone for vacuum action arranged a rotating half-neck 10, which already through its rotation continues the fiber slurry in a certain vibration. The roller 10 is driven according to Fig. 2 with a motor 11. A vibrator 12 also imparts vibrations in the axial direction.

Enligt fig. 3 dra istallet for halvalsen pa en roterande axel 13 med visst inbordes avstand anordnade runda skivor 14. Denna roterande axel och de pa. densamma fastade skivorna bibringas aven genom vibratorn 12 en hogfrekvent vibrationsrorelse i axiell led. According to Fig. 3, instead of the half-roll on a rotating shaft 13 with round discs 14 arranged at a certain inboard distance, this rotating shaft and the pa. the same fixed discs are also imparted by the vibrator 12 a high-frequency vibration movement in the axial direction.

Fig. 4 visar en anordning, vid vilken massauppslamningen paverkas medelst ljudvagor. For delta andamal aro Mom omradet for vakuumbehancllin gen i sugladan anordnade tva mitt for varandra liggan.de apparater 15, vilka alstra ljudvagor eller utltraljudvagor. Fig. 4 shows a device in which the pulp slurry is affected by means of sound waves. For delta andamal aro Mom the area for the vacuum treatment in the sugladan arranged two opposite devices 15, which generate sound waves or ultrasound waves.

Enligt fig. 5 och 6 paverkas fiberuppslamningen genom plattor 16, vilka upptill Oro utformade kamartat och Oro fastade pa en axel 17. De bibringas en hogfrekvent vibration genom en vibrator 18. According to Figs. 5 and 6, the fiber slurry is actuated by plates 16, which at the Oro formed camaraderie and Oro attached to a shaft 17. They are imparted a high-frequency vibration by a vibrator 18.

Vid den i fig. 1 visade anordningen finnes dessutom i vakuurakamm area 3 och Over behallaren 5 stralror 19 och 20. In the device shown in Fig. 1, radiators 19 and 20 are also present in the vacuum chamber area 3 and over the container 5.

Vid avluftningsanordningen enligt fig. 7 och 8 fir en vertikal mellanvagg 21 utformad sa, att den kan vibrera i sin helhet och armed paverka fiberuppslamningen. Mellanvaggen 21 är harvid forbunden med sidovaggarna 22 och paforingsbordet 23 genom mjukgummikuddar 24 eller liknande elastiska me-del. Mellanv5.ggen 21 bringas att vibrera med hjalp av en roterande excenter 25. Mellanvd.ggen kan dock Oven utformas sfr, att den omsinter en med en excenter forsedd elektromotor eller nagot annat vibrationsalstrande organ. For forhindrande av flockbildning Or stromningskanalen anordnad en droppformig ledskena 26 och en roterande halvals 27. Man kan Oven anordna flera stotkroppar eller halvalsar. In the deaeration device according to Figs. 7 and 8, a vertical intermediate wall 21 is designed so that it can vibrate in its entirety and armed affect the fiber slurry. The intermediate cradle 21 is then connected to the side cradles 22 and the paving table 23 by soft rubber cushions 24 or similar elastic means. The intermediate wall 21 is caused to vibrate by means of a rotating eccentric 25. However, the intermediate wall can also be designed in such a way that it surrounds an electric motor provided with an eccentric or some other vibration-generating member. To prevent flocculation, the flow channel is provided with a teardrop-shaped guide rail 26 and a rotating half-roll 27. Several bumpers or half-rollers can also be provided.

Fig. 9 och 10 visar ett utforande av avluftningsanordningen, vid vilken den fibermassa, som skall behandlas suges upp ur en kanal 28 till vakuumbehallaren 29 med hj alp av vakuumanordningen. Under vatskeytan finnes en halplatta 30 inorn zonen for vakuuminverkan. Den forsattes i hogfrekvent vibration genom en vibrator 31 och paverkar harigenom fiberuppslamningen. En pa luft anrikad fiberuppslamning strommar Over ett braddavlopp 32 och suges ut medelst en icke visad vakuumpump genom rorledningen 33, medan den avluftade eller avgasade fiberuppslamningen genom ett fallror 34 avledes till en kanal 36 och darifran strommar vidare till bestamningsorten. Figs. 9 and 10 show an embodiment of the deaeration device, in which the pulp to be treated is sucked up from a channel 28 to the vacuum container 29 with the aid of the vacuum device. Below the water surface there is a half plate 30 in the zone of vacuum action. It is continued in high frequency vibration through a vibrator 31 and thereby affects the fiber slurry. An air-enriched fiber slurry flows over a brad drain 32 and is sucked out by means of a vacuum pump (not shown) through the pipeline 33, while the deaerated or degassed fiber slurry is diverted through a downcomer 34 to a channel 36 and from there flows on to the destination.

Genom de ovan beskrivna olika m5jligheterna att paverka fiberuppslamningen genom vibration uppluckras vidhaftningen mellan fibrerna inbordes och de vid desamma haftande, fina luftblasorna, som genom undertrycket dragas upp till fiberuppslamningens yta, dar de sugas av med en del av fiberuppslamningen. Fiberuppslamningen kan pa detta satt avluftas relativt billigt i sadan utstrackning, att man Oven, da massan forberedes pa sadant salt, att den upptar storre mangd luft, kan lode en luftfri fiberuppslamning till pappersmaskinen, sO att denna kan lamna tillfredsstallande produkter. The various possibilities described above for influencing the fiber slurry by vibration relax the adhesion between the fibers inboard and the fine air bubbles adhering to them, which are drawn up to the surface of the fiber slurry by the negative pressure, where they are sucked off with a part of the fiber slurry. The fiber slurry can thus be vented relatively cheaply to such an extent that even when the pulp is prepared on such a salt that it absorbs a larger amount of air, an airless fiber slurry can be soldered to the paper machine so that it can leave satisfactory products.

Claims

Claim 6,1E: 1. Device for venting fiber slurries in the pulp, pulp and paper industry and the like, consisting of a vacuum chamber for sucking off the air enclosed in the fiber slurry and a part of the fiber slurry itself, characterized in that the vacuum chamber (3) Or arranged an 8verloh Rh 'the top layer of the fiber salvage and the dripping liquid foam, to which overflow a hopper Or connected, and that to the lower part of the hopper Or connected a suction line going to a vacuum pump (4) of the Over Overlocket flowing part of the fiber slurry and the foam each in the vacuum chamber (3) Concerns arranged means (10), which affect the fiber slurry by vibration.

Device according to claim 1, characterized in that in the vacuum chamber (3) Or is arranged a rotating half-roller (10), which Or is provided with devices (12), which impart a vibrational movement in the axial direction thereof.

Device according to claim 1, characterized in that in the vacuum chamber (3) Or is arranged a rotating shaft (13) with discs (14) inserted and provided with devices (12), by means of which the vibration is continued in axial joint.

Device according to claim 1, characterized in that at least one apparatus (15) is generated in the vacuum chamber (3), which generates sound waves or ultrasonic waves.

Device according to claim 1, characterized in that comb-shaped plates (16) are arranged in a vacuum axis in the vacuum chamber (3)! (17).

Device according to claim 1, characterized in that a vibrating intermediate wall (21) is arranged in the vacuum chamber (3).

Device according to claim 1, characterized in that at least one vibrating, perforated plate (30) is arranged in the vacuum chamber (29). Request publications: Patent application from France 1 005 400; Germany 402 764, 683 603; USA 1,220,611, 2,376,221.