SE187797C1 - - Google Patents

Description

Uppfinnare: B G Janson FOreliggande uppfinning hanfiir sig framst till avhartsning av i vatten uppslammad massa av cellulosafiber genom avsilning av hartshaltiga partiklar ur massan tillsammans med en del av vattnet. Inventor: B G Janson The present invention is primarily concerned with the softening of pulp fiber-suspended pulp in water by screening resinous particles from the pulp together with a portion of the water.

Uppfinnaren liar genom egna fors& fun-nit en speciell metod att utfora dylik avhartsning, som medfor mojlighet att uppna resultat som aro vida Overlagsna de som kunnat uppnas med andra hittills tillampade metoder. Denna metod kannetecknas i huvudsak darav att den hartshaltiga slamningen genom ett eller flera slamningen finfordelande centrifugalspridare sprutas i form av en sig vidgande full strale mot en pa avstand fran respektive spridare anordnad silvagg med stralens centralaxel riktad i huvudsak transversellt mot silvaggen. The inventor, through his own efforts, finds a special method for carrying out such depilation, which entails the possibility of achieving results which are far superior to those which could be achieved with other methods hitherto applied. This method is mainly characterized in that the resinous slurry through one or more slurry atomizing centrifugal diffusers is sprayed in the form of a widening full jet against a screen wall arranged at a distance from each diffuser with the central axis of the jet directed substantially transversely to the screen rocker.

Effekten Ural/ blir den att tillsarnmans med en betydande del av slamningens vatteninnehall hartsfiber och friliggande harts (hartskulor) samt korta fragment av nyttofibern gi igenom silvaggen, medan en i motsvarande grad avvattnad och avhartsad del av slamningen innehallande den langre nyttofibern kan avledas frail anslagssidan on' silvaggen. The effect Ural / is that together with a significant part of the sludge's water content resin fiber and exposed resin (resin balls) as well as short fragments of the useful fiber pass through the sieve, while a correspondingly dehydrated and dehydrated part of the slurry containing the longer useful fiber can be diverted from the impact side. 'silvaggen.

Avhartsningen sker alltsa genom en fraktionering av slamningen, varvid harts avlagsnas med den genomgaende fraktionen. The deposition thus takes place by a fractionation of the slurry, whereby resin is deposited with the continuous fraction.

For att beslysa den speciella metodens principiella overlagsenhet skall som exempel jamfOras resultat, hittills uppnadda vid avhartsning medelst aldre metoder respektive med den speciella metoden av gransulfitmassa med en hartshalt av c:a 1,5 % i hada fallen under forutsattning att avhartsningen drives till c :a % av hartsinnehallet vilket i normala fall är fullt tillrackligt. De faktorer man darvid har speciell anledning att intressera sig Or aro fOljande: a. Fiberforlust ( % ). In order to illustrate the principle of superiority of the special method, for example, the results obtained so far in resination by means of older methods and with the special method of spruce sulphite pulp with a resin content of about 1.5% in both cases should be compared, provided that the resin is driven to c: a% of the resin content which is normally fully sufficient. The factors you have special reason to be interested in are the following: a. Fiber loss (%).

Lamplig belastning av silytan (kg torrtankt massa/m2 min). Light load on the screen surface (kg dry tank mass / m2 min).

Lamplig torrsubstansbalt hos paford slamning (% )• Jamforelsen av dessa faktorer utfaller pa foljande satt: Aldre metoderDen speciella metoden min c:a. 3,5 .%c:a 1,5 % under 10 kgc:a 40 kg e. max 0,3 %c:a 0,7 % Den speciella metoden ger alltsa majlighet att i revolutionerande grad minska fiberforlusten, minska silarean (apparatstorleken) och att Oka ingaende koncentrationen, det sistnamnda med Rad koncentration av acceptet som följd. Suitable dry matter salt in paford slurry (%) • The comparison of these factors is as follows: Age methodsThe special method min c: a. 3.5% approx. 1.5% below 10 kgc: 40 kg e. Max 0.3% approx. 0.7% The special method thus provides an opportunity to reduce the fiber loss to a revolutionary degree, reduce the sieve area (device size ) and that Oka ingende concentration, the latter with Rad concentration of acceptance as a result.

Genom ovannananda fOrsok liar dessutom funnits att for varje massakoncentration finnes en lampligaste maskvidd, som ger basta resultat och f6r varje maskvidd varierar avhartsningsgraden med ytbelastningen enligt en kurva, som har ett utpraglat maximum vid vies ytbelastning. Pa omse sidor on' detta maximum faller avhartsningsgraden ganska snabbt. Man har alltsa intresse av att utan storre besvar kunna utbyta silvaggarna och/ eller kunna anpassa effektiva silarean till variationer i pafOrd massamangd sä att den lampligaste ytbelastningen under alla omstandigheter kan uppratthallas. Through the above experiments, it has also been found that for each pulp concentration there is a most suitable mesh size, which gives the best results, and for each mesh size the degree of softening varies with the surface load according to a curve which has a pronounced maximum at the surface load. On some sides at this maximum, the degree of depilation falls quite rapidly. There is therefore an interest in being able to replace the screen cradles without major problems and / or to be able to adapt the effective screen area to variations in the amount of pulp so that the most suitable surface load can be maintained in all circumstances.

Uppfinningen avser en anordning for utbildandet av en kompakt och latthanterlig app a-rat varmed den speciella metoden kan utnyttjas pa effektivaste salt. The invention relates to a device for the training of a compact and easy-to-handle apparatus with which the special method can be used on the most efficient salt.

Uppfinningen kannetecknas i huvudsak av en kombination av en i huvudsak horisontellt langstrackt centralkammare med tva motstaende langsgaende sidovaggar, som vardera ovanfor ett rannformigt bottenparti av c,en- Dupl. kl. 55 d: 4 2— — tralkammaren utefter i huvudsak hela sin langd atminstone till huvuddelen besta av silvaggar, t. ex. av finmaskig silduk, pa vardera sidan om centralkannnaren utanfor densamma ett flertal finfordelande centrifugalspridare, forlagda i atminstone en i huvudsak horisontell rad bredvid varandra pa avstand fran och riktade mot respektive sidas silytor, var spridare anordnad att bespruta var sin zon av silytan med spridaren tillford massauppslamning I form av en mot silytan sig vidgande full strata av slamningen, avlopp fran centralkammarens bottenparti fran silvaggarna darvid genomtrangande slamning samt darifran skilda avlopp for silvaggarna ieke genomtrangande fran desammas avrinnande slamning. The invention can be characterized essentially by a combination of a substantially horizontally elongated central chamber with two opposite longitudinal side cradles, each above an annular bottom portion of c, en- Dupl. at 55 d: 4 2— - the trawl chamber along essentially its entire length at least for the most part consists of silver cradles, e.g. of fine-mesh sieve cloth, on each side of the central jug outside it a plurality of finely divided centrifugal spreaders, located in at least one substantially horizontal row next to each other at a distance from each other and directed to the respective side sieve surfaces, spreaders were arranged to spray each zone of the sieve surface. In the form of a full strata of the slurry widening towards the screen surface, drains from the bottom part of the central chamber from the sieve walls thereby penetrating sludge and separate drains for the sieve walls do not penetrate from the draining sludge thereof.

Uppfinningen skall nedan narmare beskrivas med hanvisning till bifogade ritning, vilken schematiskt och sasom exempel visas en apparat, anordnad enligt uppfinningen, varvid fig. 1 illustrerar apparaten i sektion fran anden, fig. 2 illustrerar sarnma apparat i sektion 'defter linjen H—II i fig. 1 och fig. 3 illustrerar densamma i sektion utefter lin- jen1 fig. 2. Identiska detaljer aro i de olika figurerna forsedcla med samma hanvisningsbeteckningar. The invention will be described in more detail below with reference to the accompanying drawing, which schematically and as an example shows an apparatus, arranged according to the invention, Fig. 1 illustrating the apparatus in section from the spirit, Fig. 2 illustrating the same apparatus in section 'along the line H-II in Fig. 1 and Fig. 3 illustrate the same in section along the line Fig. 2. Identical details are in the various figures provided with the same male reference numerals.

En centralkammare 1, som är langstrackt horisontell led har tvet motstilende langsgaende sidovaggar 2, vilka ovanfOr ett rannformigt bottenparti in av centralkammaren till sin huvuddel bestar av silvaggar 2a. Pa vardera sidan om centralrannan aro anordnade ett antal centrifugalspridare 3 i Iva ovanfor varandra belagna rader och anslutna till en gemensam stamledning 4 genom var sin granledning 5 f5r tillf5rsel av massauppslamning till spridarna. Vardera spridaren am anordnad sprida tillf5rd slamning i form av en sig vidgande full strale mot var sin zon av filterytan. Den kan f5r detta andamal vara av darfor lampad kand typ t. ex. med ett inre skruvorgan eller darmed likverkande anordning som satter slamningen i rotation invid spridarens avlopp. Pa vardera sidan om centralkammaren am sidans silyta omsluten av en sidokammare 7, i vilken spridarna insticka och dar silytorna icke genomtrangande slamning (acceptet) uppfangas for att darifran avledas genom ett avlopp 8. For att aeceptet fran de ovre besprutade zonerna ej skall kunna avrinna Over underliggande besprutade zonerna eller genom stralarna till dessa, vilket starkt skulle stora forloppet darst5.des, ar sidokammaren delad genom en mellanbotten 9 Over vilken acceptet fran de Ovre zonerna le-des Over en kant 10 i sidokammaren mot avloppet 8 helt vid sidan om de nedre straIarna. A central chamber 1, which is an elongate horizontal joint, has two opposite longitudinal side walls 2, which above a ran-shaped bottom part into the central chamber for its main part consist of screen walls 2a. On each side of the central ridge are arranged a number of centrifugal spreaders 3 in Iva superimposed rows and connected to a common trunk line 4 through separate spruce lines 5 for supplying pulp slurry to the spreaders. Each spreader is arranged to spread the supplied slurry in the form of an expanding full jet towards each zone of the filter surface. For this purpose, it may be of a candle-type candle type, e.g. with an internal screw member or similar device which sets the slurry in rotation next to the spreader drain. On each side of the central chamber, the sieve surface of the side is enclosed by a side chamber 7, in which the spreaders insert and where the sieve surfaces do not penetrate sludge (acceptance) to be diverted therefrom through a drain 8. So that the acceptor from the upper sprayed zones cannot drain underlying sprayed zones or through the jets thereof, which would greatly increase the flow there, the side chamber is divided by an intermediate bottom 9 over which the acceptance from the upper zones is directed over an edge 10 in the side chamber towards the drain 8 completely next to the lower ones. straIarna.

Den silytorna genomtrangande slamningen (rejektet) uppfangas I centralkammaren och avledes darifran genom ett avlopp 10. Rejektet fran de ovre zonerna lades darvid fritt fran de undre zonernas silyta genom skarmar 11. The slurry penetrating the sieve surfaces (the reject) is caught in the central chamber and diverted therefrom through a drain 10. The reject from the upper zones is then laid free from the sieve surface of the lower zones through screens 11.

Dessa kunna givetvis alternativt ersittas med en mellanbotten anordnad som bottnen 9. These can of course alternatively be replaced with an intermediate bottom arranged as the bottom 9.

Spridarna 3 aro infattade i forskruvningar eller likverkande fattningar av nagot kant slag, varmed de kunna installas pa olika avstand till silytan. PA grund av stralformen kommer en forskjutning utat att resultera i en forstoring och en forskjutning ink att resultera i en fOrminskning av den effektiva silytan for var spridare. Harigenom kan man anpassa denna yta efter tillforselmangden sa att lampligaste ytbelastning kan erhallas vid olika tillforselmangd. Denna mangd kan for var sida regleras med en ventil 12 i stamledningen 4, som forutsattes sta i forbindelse med ett matarsystem for slamningen, ej visat A figuren. Alternativt kan man tanka sig att var sidas spridare anordnas rorliga gemensamt genom att stamtedningen anordnas rot.-hg i sidled. The diffusers 3 are enclosed in screw connections or equal-like sockets of some kind, with which they can be installed at different distances to the screen surface. Due to the beam shape, an outward shift will result in an enlargement and an offset ink will result in a decrease in the effective sieve area of each diffuser. In this way, this surface can be adapted to the supply quantity so that the most suitable surface load can be obtained at different supply quantities. This quantity can be regulated for each side with a valve 12 in the main line 4, which was assumed to be in connection with a supply system for the slurry, not shown in the figure. Alternatively, it is conceivable that each side's spreader is arranged movably together by arranging the stem joint rotationally laterally.

Silarna 2a aro inskjutna i spar i sidovaggarna 2 sa att de latt kunna utdragas ur systemet genom slitsar 13 i apparatens ena gavel. Utbyte av sitar ar alitsA Hut att gora. The screens 2a are inserted in grooves in the side cradles 2 so that they can easily be pulled out of the system through slots 13 in one end of the apparatus. Exchange of seats is alitsA Hut to do.

En dylik anordning kan modifieras ph mangahanda salt inom ramen for uppfinningen och framst da pa sa satt att spridarna ph var sida anordnas i endast en rad varvid man kan tanka sig den illustrerade anordningen med partiet over mellanvaggarna 9 borttaget. Del ar givetvis a-ven miijligt for en fackman att utbygga anordningen pa. hOjden med flera rader spridare enligt den illustrerade principen. Med manga rader blir del dock svarare att erhalla jamn fordelning av slamning till de olika raderna pa grunt! av Okad hOjdskillnad mellan nedersta och oversta raden. Ur denna synpunkt och givetvis aven ur fOrenklingssynpunkt ar givetvis en rad att foredraga men i de fall att apparaten vid behov av start spridarantal darvid skulle bli t. ex. av lokala skal olampligt lang erbjuder I alla handelser anordningen med tva rader en kompromiss, som icke kan medfora nagon v5sentlig olagenhet. Such a device can be modified with many kinds of salt within the scope of the invention and only then in such a way that the spreaders on each side are arranged in only one row, whereby the illustrated device can be filled with the portion above the intermediate walls 9 removed. Of course, it is also possible for a person skilled in the art to expand the device on. the height with several rows of spreaders according to the illustrated principle. With many rows, however, it becomes more difficult to obtain an even distribution of sludge to the different rows on the ground! of Increased height difference between bottom and top row. From this point of view and of course also from the point of view of simplification, there is of course a number to be preferred, but in cases where the device would need to be started, the number of diffusers would then be e.g. of local shells inappropriately long In all transactions, the two-line device offers a compromise which can not lead to any significant irregularity.

Det kan Liven vara fordelaktigt att uppdela eentralkammaren i Iva halvor vid sidan om varandra genom en mellanvagg som hindrar stank genom den ena sidans silvagg att traffa den andra sidans silvagg och stOra silningsverkan darstades. Darigenom kan centralkammarens bredd utan olagenhet nedbringas till ett minimum. It may be advantageous for Liven to divide the one-chamber into two halves side by side through an intermediate wall which prevents stench through the sieve wall on one side from hitting the sieve wall on the other side and the great sifting effect there. Thereby, the width of the central chamber can be reduced to a minimum without illegality.

Claims (7)

Patentanspr A k:Patent claim A k: 1. Anordning for avhartsning, urvattning och/eller fraktionering av i vatten uppslammad massa av cellulosafiber genom silning av slamningen, kanneteeknad av en kombination av en i huvudsak horisontellt langstrackt centralkammare med tva motstilende langsgaende — —3 sidovaggar, som vardera ovanfOr ett rannformikt bottenparti av centralkammaren utefter i huvudsak hela sin langd atminstone till huvuddelen besta av silvaggar, t. ex. av finmaskig silduk, pa vardera sidan om centralkammaren utanfor densamm.a ett flertal finfordelande centrifugalspridare, forlagda i atminstone en i huvudsak horisontell rad bredvid varandra pa avstand fran och riktade mot respektive sidas 'silytor, var spridare anordnad att bespruta var sin zon av silytan med spridaren tillford massauppslamning i form av en mot silytan sig i huvudsak koniskt vidgande full strale av slamningen, avlopp fran centralkammarens bottenparti for silvaggarna darvid genomtrangande slamning saint darifran skilda avlopp f5r silvaggarna joke genomtrangande frail desamma avrinnande slam-fling.Device for de-resinizing, dewatering and / or fractionating cellulose fiber pulp suspended in water by screening the slurry, characterized by a combination of a substantially horizontally elongated central chamber with two opposite longitudinal - - 3 side cradles, each above a circular bottom portion the central chamber along substantially its entire length at least for the most part consists of screen cradles, e.g. of fine-mesh screen cloth, on either side of the central chamber outside it.a plurality of finely divided centrifugal spreaders, located in at least one substantially horizontal row next to each other at a distance from each other and directed to each side's screen surfaces, were spreaders arranged to spray each zone of the screen surface with the spreader supplied pulp slurry in the form of a full jet of sludge extending towards the sieve surface, substantially conically widening, drains from the bottom portion of the central chamber for the sieve walls thereby penetrating sludge saint therefrom separate drains for the sieve walls joke penetrating frail the same draining sludge-fling. 2. Anordning enligt patentanspraket 1 med atminstone tva over varandra anordnade rader av spridare, varvid en ovre rads spridare aro anordnade att bespruta zoner av silytan belagna hogre an de zoner, som besprutas av en undre rads spridare, kannetecknad darav, att mellan raderna forefinnes anordning lampligen i form av en mellanbotten e. d. for uppsamling och avledning av fran de hogre zonerna avstrommande, silytan icke genorntrangande slamning pa vagar, som varken leda Over de nedre zonerna eller genom de av dessa besprutade stralarna av slamningen.Device according to claim 1 with at least two rows of spreaders arranged one above the other, wherein an upper row of spreaders are arranged to spray zones of the screen surface located higher than the zones which are sprayed by a bottom row of spreaders, characterized in that there is a device between the rows suitably in the form of an intermediate bottom oath for collecting and diverting from the upper zones flowing from the upper zones, non-penetrating sludge on scales, which lead neither over the lower zones nor through the jets of the sludge sprayed by them. 3. Anordning enlist patentanspraket 1 eller 2, kannetecknad darav, att spridarna aro sa anordnade att deras avloppsmynningar kunna installas pa olika aystand fran silytan.Device according to claim 1 or 2, characterized in that the diffusers are arranged so that their drain orifices can be installed at different distances from the screen surface. 4. Anordning enligt patentanspraket 1, 2 eller 3, kannetecknad daray, att anordning forefinnes att reglera mangden av slamning till spridarna.Device according to claim 1, 2 or 3, characterized in that there is a device for regulating the amount of sludge to the spreaders. 5. Anordning enligt patentanspraket 1, 2, 3 eller 4, kannetecknad &ray, att silytan pa vardera sidan om centralkammaren är omsluten av en sluten sidokammare i vilken motsvarande sidas spridare inmynna och vilken di forsedd med avlopp for silvaggen joke genomtrangande -slamning.Device according to claim 1, 2, 3 or 4, characterized in that the screen surface on each side of the central chamber is enclosed by a closed side chamber into which the corresponding side spreader opens and which is provided with drainage for the silhouette joke penetrating slurry. 6. Anordning enligt patentanspraket 1, 2, 3, 4 eller 5, kannetecknad darav, att centralkammarens silvaggpartier aro infattade i sidovaggarna i fattningar ur vilka de kunna utdragas.Device as claimed in patent claim 1, 2, 3, 4 or 5, characterized in that the screen cradle portions of the central chamber are included in the side cradles in sockets from which they can be pulled out. 7. Anordning enligt patentanspraken 1, 2, 3, 4, 5 eller 6, kannetecknad (Way, att centralkammaren gr uppdelad i tva halvor vid sidan om varandra genom en mellanvagg. Anforda publikationer: Patentskrifter fran Sverige 29 939; Storbritannien 554 837; Tyskland 193 162.Device according to patent claims 1, 2, 3, 4, 5 or 6, can be drawn (Way, that the central chamber is divided into two halves next to each other through a partition. Request publications: Patent documents from Sweden 29,939; United Kingdom 554,837; Germany 193 162.