SE125103C1

SE125103C1 -

Info

Publication number: SE125103C1
Authority: SE
Publication date: 1949-01-01

Description

Uppfinnare: G. V. Oholm. Inventor: G. V. Oholm.

Yid torkning av exempelvis spanninal i torksilos är det kant, att forst forvarma spannmalen i en ovre zon av torksilon genom att bringa spannmalen i direkt kontakt med av ett varmemedium uppvarmda ytor och darpa torka spannmalen i en nedre zon av torksiIon genom att rata spannmalen i denna nedre zon direkt genomstrommas ,av ett uppvarmt torkm.edium, exempelvis luft. For drying of, for example, cereal in a drying silo, it is advisable to first preheat the cereal in an upper zone of the drying silo by bringing the cereal into direct contact with surfaces heated by a heating medium and allowed to dry the cereal in a lower zone of drying silo by grating the cereal therein. lower zone is directly flowed through, by a heated drying medium, for example air.

Fareliggande uppfinning, som utgor ett forfarande vid torkningen, hanfor sig till torksilos av namnda slag. The present invention, which constitutes a method of drying, relates to a drying silos of the kind mentioned.

Pa grund av spannmalens egenart tal denna joke vilka temperaturer sorn heist. Overskrides en temperatur av ungefar 60° C, sâ mister spannmalen formagan att kunna gro. Denn.a temperatur pa spannmalen far darfOr icke overskridas. Due to the peculiarity of the grain, this joke speaks of the temperatures that rise. If a temperature of more than 60 ° C is exceeded, the grain loses its ability to germinate. This temperature of the grain must therefore not be exceeded.

Under spannmalens forvarmning i och for torkning, kan spannmalen vara relativt kall och relativt vat. Om forhallandena aro sadana, tal spannmalen en relativt hag temperatur pa de varma ytor, Over vilka den runner i silons oyre S. k. foryarmningszon. De yarma ytorna kunna ,salunda hava en temperatur pa upptill 70° C, utan att spannmalen tillagnar sig denna temperatur genom att rinna Over dem, vilket darts& i vissa fall kan hava sina fordelar. During the preheating of the grain in and before drying, the grain can be relatively cold and relatively wet. If the conditions are such, the grain speaks a relatively high temperature on the warm surfaces, above which it flows in the silo's ear, so-called preheating zone. The hot surfaces can thus have a temperature of up to 70 ° C, without the grain acquiring this temperature by flowing over them, which darts & in some cases can have its advantages.

Under spannmalens torkning i den s. k. torkningszonen far daremot temperaturen 600 eller daromkring joke overskridas, varfOr torkmediet, vanligen luft, ej far hava hogre ternperatur an denna. During the drying of the grain in the so-called drying zone, on the other hand, the temperature 600 or thereabouts is exceeded, so that the drying medium, usually air, must not have a higher temperature than this.

Varmeytorna i forvarnmingszonen erhalla sitt varme genom att de utgora vaggar i karl, som genomstram.mas av varmt vatten eller anga och varmemediet for direkt genomstromning och torkning av spannmalen i torkningszonen erhaller .sitt varme genom att passera en varmevaxlare, som genomstrommas av varmt vatten eller anga. Torkningsmediet ken -darvid vara ett cirkulerande medium, som -Mares ventilationsmedel av torr beskaffenhet och frail vilket ventilationsmedium av fuktig beskaffenhet avledes. The heating surfaces in the preheating zone obtain their heat by forming rocks in vessels which are permeated by hot water or steam and the heating medium for direct flow and drying of the grain in the drying zone obtains its heat by passing a heat exchanger which is permeated by hot water or anga. The drying medium can then be a circulating medium, such as -Mare's ventilation medium of dry nature and frail which ventilation medium of a damp nature is diverted.

Forfarandet enligt uppfinningen gar ut pa att Oka varmeekonomin vid anlaggningar av namnt slag och bestar framst dari, att torkmediet som direkt genomstrommar och torkar spannmalen, uppvarmes till en temperatur av maximalt 60° genom att ledas Over en -varmevaxlare, som genomstrommas av ett varmemedium, och att samma vdrmemedium darpa hell eller delvis, i form av gas, anga eller vatska, eventuellt som kondensat, bringas att uppvarma de ytor till en temperatur Over 60° C, med vilka spannmalen bringas i direkt kontakt under forvarmningen. En sarskilt god ekonomi for anlaggningen som helhet vinnes vid anlaggningar, vid vilka torkmediet for direkt genomstromning och torkning av spannmalcn cirkulerar i en sluten ledning under avledning av en del fuktigt medium och inforandet av torrt medium, om enligt ett sarskilt fOrfarande enligt uppfinningen det torra mediet omedelbart fore inforandet i cirkulationen indirekt forvarmes genom att ledas Over en varmevaxlare, som uppvarmes av det yarmemedium, som redan anyants till uppvarmning ay de ytor, med vilka spannmalen bringas i direkt kontakt under forvarmningen och/eller uppvarmes av det frail cirkulationsledningen avgaende vata mediet. The process according to the invention is to increase the heat economy in plants of the named type and consists primarily in that the drying medium which directly flows through and dries the grain is heated to a temperature of a maximum of 60 ° by being passed over a heat exchanger, which is passed through by a heating medium. and that the same heating medium drip completely or partially, in the form of gas, steam or liquid, possibly as condensate, is brought to heat the surfaces to a temperature Above 60 ° C, with which the grain is brought into direct contact during the preheating. A particularly good economy for the plant as a whole is obtained in plants in which the drying medium for direct flow and drying of the granules circulates in a closed line while diverting some moist medium and the introduction of dry medium, if according to a special method according to the invention the dry medium immediately before the introduction into the circulation is indirectly preheated by being passed over a heat exchanger, which is heated by the yarm medium, which is already anyants for heating ay the surfaces with which the grain is brought into direct contact during the preheating and / or heated by the wet medium.

En anordning for utforandet av fi5rfarandena enligt uppfinningen visas schematiskt pa bifogade ritning. An apparatus for carrying out the methods of the invention is shown schematically in the accompanying drawing.

Spannmalen nedrinner genom ett siloschakt 1, i vars byre del, forvarmningszonen, ett varmebatteri 2 är anbragt och i vars nedre del, torkningszonen, ett antal perforerade rdr 3 an anordnade. The granulate flows down through a silo shaft 1, in the upper part of which, the preheating zone, a heating coil 2 is arranged and in the lower part of which, the drying zone, a number of perforated pipes 3 are arranged.

A.nga eller varmvatten av exempelvis 70° C temperatur tillfores varmebatteriet 2 genom ett ror 4 °eh •avledes genom ett Air 5. Nan spannmalen rinner Over batteriets 2 ytor forvarmes den. In steam or hot water of, for example, 70 ° C temperature, the heating battery 2 is supplied through a rudder 4 ° and is diverted through an Air 5. When the grain flows over the surfaces of the battery 2, it is preheated.

I torkningszonen finnas tvenne kamrar 6 resp. 7, av vilka kammaren 6 star i forbindelse med en del av rtiren 3 och kammaren 7 med de ovriga. Kammaren 6 star genom en trumma 8 i forbindelse med ett hus 9, i vilket 2— — är anbragt ett varmebatteri 10, som tillfores varmvatten ,eller anga genom ett ror 11. Vattnet eller angan, eventuellt kondensat, avledes genom roret 12, som är forbundet med roret 4. In the drying zone there are two chambers 6 resp. 7, of which the chamber 6 is connected to a part of the rear 3 and the chamber 7 to the others. The chamber 6 stands through a drum 8 in connection with a housing 9, in which a heating battery 10 is supplied, which is supplied with hot water, or passed through a pipe 11. The water or steam, possibly condensate, is diverted through the pipe 12, which is connected to the rudder 4.

I huset 9 ãr en motordriyen flakt 13 anbragt. Huset 9 ar vidare genom en trumma 14 anslutet till kammaren 7. Trumman 14 är forsedd med ett avlopp 15 for vat ventilationsluft och med ett inlopp 16 for torr ventilationsluft. Genom inloppet 16 inkommande friskluft passerar i pilarnas riktning trumman 14, flakten 13, batteriet 10, dar uppvarmning sker, huset 9, trumman 8, kammaren 6 och ingar i de till kammaren anslutna roren 3, vilka den ldmnar genom rorens perforeringar och genomstrommar den nedrinn.ande spannmalen och ingar i de ovriga roren 3 genom dessas perforeringar for att fortsatta in i den med dessa forbundna kammaren 7 och darifran tillbaka in i trumman 14, frail vilken en del av den nu fuktiga luften avledes genom avloppet 15, medan resten fortsatter i trumman 14 och forenar sig med inkommande torr friskluft genom inloppet 16, varefter forloppet upprepas. Det beskrivna forloppet ar alltsh ett cirkulationsforlopp av kand typ. In the housing 9 a motor-driven flat 13 is arranged. The housing 9 is further connected through a drum 14 to the chamber 7. The drum 14 is provided with a drain 15 for wet ventilation air and with an inlet 16 for dry ventilation air. Fresh air entering through the inlet 16 passes in the direction of the arrows the drum 14, the flat 13, the battery 10, where heating takes place, the housing 9, the drum 8, the chamber 6 and enters the pipes 3 connected to the chamber, which it flows through the perforations of the pipes and flows down the grain and ingots into the other tubes 3 through their perforations to continue into the chamber 7 connected thereto and thence back into the drum 14, from which part of the now moist air is diverted through the drain 15, while the rest continues in the drum 14 and unites with incoming dry fresh air through the inlet 16, after which the process is repeated. The process described is all a circulation process of a known type.

Det medium, som inledes genom roret 11, liar lampligen en temperatur av 90-100° G, men. det som avledes genom raret 12 bar ieke, i den man ,det ledes till roret 4, lava hogre temperatur an 70° C. En del av mediet kan avledas genom stutsen 17, som är forsedd med en icke visad ventil. The medium introduced through the tube 11 is suitably at a temperature of 90-100 ° C, but. what is diverted through the tube 12 bar ieke, in the man, it is led to the tube 4, lava higher temperature than 70 ° C. A part of the medium can be diverted through the nozzle 17, which is provided with a valve (not shown).

Av det beskrivna exemplet framgar att enligt uppfinningen samma medium anvandes till att forst leverera varme till batteriet 10 och sedan till batteriet 2, vilket okar anlaggningens ekonomi pa ett formanligt satt. From the described example it appears that according to the invention the same medium is used to first supply heat to the battery 10 and then to the battery 2, which increases the economy of the plant in a measurable way.

For att ytterligare aka anlaggningens ekonomi kan vidare det fran roret 5 avgaende mediet ledas till en varmevaxlare 18 i huset 19, som hr anslutet till inloppet 16. Harigenom forvarmes den genom inloppet 16 inkommande ventilationsluften. Ett annat satt är att frail avloppet 15 leda den fuktiga ventilations luften genom en varmevaxlare 20, likaledes anbragt i huset 19 och tjanande samma andamal som nyssnamnda. Alternativt kunna varmevaxlarna 18 och 20 anvandas hada samtidigt och, beroende pa temperaturerna, anordnas i serie sd att den inkommande friskluften passerar forst den ena och sedan den andra varmevaxlaren och darvid forst den, som liar den lagre temperaturen. In order to further increase the economy of the plant, the medium emanating from the pipe 5 can further be led to a heat exchanger 18 in the housing 19, which is connected to the inlet 16. Thereby the ventilation air entering through the inlet 16 is preheated. Another way is that the frail drain 15 directs the moist ventilation air through a heat exchanger 20, likewise arranged in the housing 19 and serving the same purpose as the just mentioned. Alternatively, the heat exchangers 18 and 20 can be used simultaneously and, depending on the temperatures, arranged in series so that the incoming fresh air passes first one and then the other heat exchanger and thereby only the one which maintains the lower temperature.

Claims

Patent claim:

A process for drying, for example, cereals in a drying silo, in which the cereals are first preheated in a dry zone of drying silos by being brought into direct contact with surfaces heated by a heating medium and dried by being directly flowed through a heated zone in a lower zone of drying silos. drying medium, for example air, can be characterized in that the drying medium, which directly flows through and dries the grain, is heated to a temperature of a maximum of 60 ° C by being passed over a heat exchanger, which is passed through by a heating medium, and that the same heating medium drips completely or partially in the form of gas, anga or liquid, possibly as condensate, are brought to heat the surfaces to a temperature above 60 ° C, with which the grain is brought into direct contact during the pre-storage.

A method according to claim 1, in which the drying medium for direct flow and drying of the grain circulates in a closed line while diverting some moist medium and the introduction of dry medium, characterized in that the dry medium is immediately concerned with the introduction into the circulation indirectly. preheated by conduction Over a heat exchanger heated by the heating medium, scans have already been used to heat the surfaces with which the grain is brought into direct contact during the preheating, and / or are heated by the wet medium emanating from the circulation line. Stockholm 1919. Kungl. Boktr, P. A. Norstedt & & Suer 490089