Uppfinnare: J. tistr5na.
Inventor: J. tistr5na.
Foreliggande uppfinning avser ett salt att tomma vatskeuppslamningar av fasta aranen, speciellt vatskeuppslamningar av cellulosa eller flis, ur dylika uppslamningar innehllande kurl, t. ex. cellulosakokare, diffusorer eller dylikt genom en eller flera Oppningar i eller nara botten av karlet, vilket satt i huvudsak kannetecknas darav, att man genom infOrande av gas, luft eller anga och lampligen aven avpassning av narvarande vatskernangd sorjer for en sadan omroring av karlets innehall under tomningen, ail det uppslammade anmet jamnt transporteras ur karlet tillsammans med vatskan. Gas-, luft- eller angstrom-men kan bringas att kontinuerligt eller st8tvis passera genom hela det iiverliggande skiktet av uppslanmingen. Densamma kan tillföras i och/eller runt om tOmningsoppningen eller -oppningarna. Enligt en utfOringsform tillfOres gas-, luft- eller angstrommen under ett overtryck av 0,os-10 kg/cm' relativt det vid tillfOrselstallet radande trycket av uppslamningen. Dä sattet tillampas vid tomning av ho-hare, diffusorer eller liknande, varvid uppslamningen tOmmes i en massabinge eller dylikt, kan vattnet eller annan uppslamningsvatska skilj as Iran den fasta substansen och kontinuerligt eller intermittent aterledas till kokaren, diffusoren eller dylikt, I. ex. genom pumpning. Vid tOmning av exempelvis sulfitkokare pa deras innehall av massa har hit-tills en stor del av kokareinnehdllet fatt spolas ut med tillhjalp av kraftiga vattenstralar. I allmanhet tillgar delta sa, att en arbetare fran toppen av kokaren genom en kraftig, bOjhg gummislang medelst vatten under Mgt tryck spolar ut massan. Detta salt att tomma en kokare är tidsodande och nedsatter on6- digtvis kokeriets kapacitet. Manga forsOk tried intagning av vatten, anga eller liknande under sjalva tappningen ha ocksa gjorts i andamal att nedbringa tappningstiden, men hittills har icke framkommit flagon anyandbar metod. Speciella svarigheter att tomma kokaren foreligga, om av nagon anledning en daligt uppsluten, flisig massa eller ren traflis skall Vanillas ur kokaren. Vid sadana tillfallen har man i allmanhet fatt tillgripa direkt osning for hand for att fa kokaren tom. Pa. den senaste tiden ha framkommit kokmetoder for framstallning av hogforadlad pappersmassa, dar kokningen sker i tva steg och dar flisen fran det forsta steget tOmmes ur kokaren, innan flisen undergatt nagon egentlig uppmjukning eller forandring. For detta andarnal liar man byggt specialformade kokare med mycket stora tappningshal for uttagning av flisen i torrt eller avrunnet tillstand. Det har namligen ansetts omojligt att tomma flisen med tillhj alp air vatten ph samma salt som vid Winning av massa. The present invention relates to a salt which empties liquid slurries of solid aran, in particular liquid slurries of cellulose or wood chips, from such slurries containing curl, e.g. cellulose boilers, diffusers or the like through one or more openings in or near the bottom of the vessel, which was mainly characterized by the introduction of gas, air or steam and suitably also the adjustment of the present water-laden sorority for such agitation of the vessel's contents during the emptying, ail the suspended sludge is evenly transported out of the tub together with the liquid. The gas, air or anxiety flows can be caused to pass continuously or intermittently through the entire overlying layer of the slurry. The same can be applied in and / or around the emptying opening or openings. According to one embodiment, the gas, air or anxiety drum is supplied under an overpressure of 0, os-10 kg / cm 2 relative to the pressure radiating at the supply number. When the method is applied when emptying ho-hare, diffusers or the like, whereby the slurry is emptied into a pulp bin or the like, the water or other slurry liquid can be separated as Iran the solid substance and continuously or intermittently returned to the boiler, diffuser or the like, e.g. by pumping. When emptying sulphite boilers on their pulp content, for example, a large part of the boiler contents has hitherto had to be flushed out with the aid of powerful water jets. In general, delta workers say that a worker from the top of the digester through a strong, flexible rubber hose by means of water under high pressure flushes out the mass. This salt to empty a cooker is time consuming and inevitably reduces the capacity of the cooker. Many attempts have been made to ingest water, steam or the like during the actual bottling have also been done in the spirit of reducing the bottling time, but so far no other method has emerged. Special requirements for the empty boiler to exist, if for any reason a poorly digested, chipped mass or clean traflis must be Vanilla from the boiler. In such cases, direct sniffing has generally been resorted to by hand to empty the digester. Pa. Recently, cooking methods have been developed for the production of highly refined pulp, in which the cooking takes place in two steps and in which the chips from the first step are emptied from the boiler, before the chips have undergone any actual softening or change. For this purpose, specially shaped boilers with very large bottling halls have been built for removing the chips in a dry or drained condition. Namely, it has been considered impossible to empty the chips with the help of alp air water ph the same salt as in Winning of pulp.
Foreliggande uppfinning avser, sasom ovan anLyits, ett satt att tomma kokare eller andra karl, som innehalla vatskeuppslamningar av fasta amnen, under anvandande av en vatska och en gas eller anga, t. ex. vatten och luft, varvid gasen bringas att genomstromma innehAllet fran tappningsOppningen och uppat, varvid en i forhallande till nedlagd energimangd mycket kraftig omroring av karlets innehall vinnes, Tarigenom tappningen med vatten, nar det galler flis, mojliggores, och nar det galler vanlig massa, vasentligen underlattas. Vid en fabrik, dar metoden anvants, har flis, som kokats under endast ett par timmar och vilken alltsa varit i det narmaste opaverkad betraffande dess mekaniska egenshaper, tappats ur kokaren pa mycket kortare tid an Tad som erfordras vid motsvarande tappning av fardigkokad massa enligt den gamla metoden medelst spolning. Uppfinningen shall i det foljande narmare beskrivas under hanvisning till a bifogade ritningar visadc utforingsexempel, dar fig. I och fig. II askhdliggora uppfinningens tillampning vid en liggande resp. staende kokare. I bada figurerna betecknas motsvarande delar med samma sifferhanvisningar. The present invention relates, as stated above, to a method of emptying boilers or other vessels containing liquid slurries of solids, using a liquid and a gas or vapor, e.g. water and air, whereby the gas is caused to flow through the contents from the tapping opening and upwards, whereby a very vigorous agitation of the vessel's contents is obtained in relation to the amount of energy lost, through the tapping with water, when chipping is possible, and when ordinary mass churns, essentially be omitted. At a factory where the method is used, chips which have been boiled for only a couple of hours and which have thus been virtually unaffected in terms of their mechanical properties have been discharged from the boiler in a much shorter time than that required for the corresponding bottling of ready-cooked pulp according to the old method by flushing. The invention will be described in more detail in the following with reference to the exemplary embodiments shown in the accompanying drawings, in which Fig. 1 and Fig. II illustrate the application of the invention to a horizontal resp. standing cooker. In both figures, corresponding parts are denoted by the same numerical references.
I fig. I betecknar 1 en liggande kokare i tvarsektion, 2 är en beskickningsoppning. Vid tomningen pressas prcssluft Iran kompressorn 10 och luftklockan 11 genom ett ror 12, omstallningsanordningen 13 och fordelningsror 14 in i kokaren. Harvid intages lampligen storsta luftmangden i den runt tappningsoppningen 3 liggande ringen 15, som är forsedd med 2-- — hal av lampliga dimensioner, som giva den instrommande luften en lamplig riktning, sa att en andanahlsenlig omroring vid tappningshalet erhalles. En forutsattning for att tomningen skall lyckas är, att flisen eller massan aldrig far rinna tOrr. DarfOr Mir man under hela tomningen hàlla vatska over flisen. Luft inpressas under ett visst overtryck och tvingas att passera genom kokarinnehallet. Luft kan ocksa intagas ph andra stallen i kokaren an vid tappningsoppningen, t. ex. i de perforerade roren. 16 i kokarens kalott. Dels ph grund av direkt stotverkan och dels ph grund av luftens expansion och transport genom kokarinnehallet, erhaller detta en. mycket kraf, tig ornroring, som mojliggor tappning ph kort lid. For att underlatta tappningen kan ocksa luft eller vatten tillsattas i tappningsroret 5 eller ventilen 4. Flisen eller massan tappas genom roret 5 ned i massabingen 6, som är forsedd med silbotten 7, eller ocksa far den ga Over annan avvattningsanordning. Det avdragna vattnet eller vatskan kan anvandas till att halla lampligt vatskestand i kokaremi under tappningen, varvid alltsà st8rre eller mindre mangd vatten aterfores till kokaren genom pumpen. 8 och ledningen 9. En viss fordel är att under en kort period taga in en stor luftmangd i kokaren. Hadar kan man ordna sa, att kompressorn 10 far arbeta pa en forhallandevis stor luftklocka 11, t. ex. med en. rynid av 100-200 n3.3. Vidare är det lampligt att vaxla intagningen av luft pa olika stallen 1 kokaren och inf8ra luften mer eller minre stotvis. Detta kan ph i fig. I antytt salt ske medelst omstallningsanordningen 13. I fig. II visas uppfinningens tillampning pa en sthende kokare, varvid luf ten intages genom flera, t. ex. 3, Over varandra anordnade perforerade slingor 15, 16 och 17. Aven liar är det lampligt alt ordna sa, att luften kan tagas in vaxelvis pa de olika slingorna. In Fig. 1, 1 denotes a horizontal digester in cross section, 2 is a loading opening. During emptying, compressed air Iran compressor 10 and the air bell 11 are forced through a tube 12, the changeover device 13 and the distribution tube 14 into the digester. In this case, the largest amount of air is suitably taken up in the ring 15 lying around the tapping opening 3, which is provided with a 2 - - hal of suitable dimensions, which give the inflowing air a suitable direction, so that a normal agitation at the tapping tail is obtained. A prerequisite for the emptying to succeed is that the chips or mass must never run dry. Therefore, throughout the emptying, keep water over the chips. Air is forced in under a certain overpressure and is forced to pass through the boiler contents. Air can also be taken in at other stalls in the boiler at the tapping opening, e.g. in the perforated tubes. 16 in the cooker's hood. Partly ph due to direct impact and partly ph due to the expansion of air and transport through the boiler contents, this obtains a. much power, tig ornroring, which enables vintage ph short lid. To facilitate tapping, air or water can also be added to the tapping pipe 5 or the valve 4. The chips or pulp are also discharged through the pipe 5 into the pulp bin 6, which is provided with the sieve bottom 7, or it can also be passed over to another drainage device. The drawn water or liquid can be used to maintain a suitable liquid level in the boiler during bottling, whereby a greater or lesser amount of water is returned to the boiler through the pump. 8 and the line 9. A certain advantage is to take in a large amount of air in the boiler for a short period. Hadar can be arranged so that the compressor 10 is allowed to operate on a relatively large air bell 11, e.g. with a. rynid of 100-200 n3.3. Furthermore, it is convenient to alternate the intake of air in different places in the boiler and to introduce the air more or less intermittently. This can be done in the salt indicated in Fig. 1 by means of the switching device 13. Fig. II shows the application of the invention to a standing boiler, in which case the air is taken in by several, e.g. 3, perforated loops 15, 16 and 17 arranged one above the other. It is also convenient to arrange them in such a way that the air can be taken in alternately on the different loops.