DK167128B1 - DEVICE FOR REGULATING THE DRYING PROCESS IN A WHEEL LAYER - Google Patents
DEVICE FOR REGULATING THE DRYING PROCESS IN A WHEEL LAYER Download PDFInfo
- Publication number
- DK167128B1 DK167128B1 DK245979A DK245979A DK167128B1 DK 167128 B1 DK167128 B1 DK 167128B1 DK 245979 A DK245979 A DK 245979A DK 245979 A DK245979 A DK 245979A DK 167128 B1 DK167128 B1 DK 167128B1
- Authority
- DK
- Denmark
- Prior art keywords
- temperature
- setting means
- nozzle
- drying process
- vortex layer
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
- F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
- F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed
Description
-1 - DK 167128 B1-1 - DK 167128 B1
Opfindelsen angår en indretning til regulering af tørringsprocessen i en hvirvellagstørrer, i hvilken opløsninger, smelter eller suspensioner tørres til et granulat under tilsætning af kondensationskim, der har en hvirvellagstørrer og midler til ændring af temperaturen af den gennem indstrøm-5 ningsbunden indstrømmende gas og er forsynet med et kontinuerligt granulatudløb gennem et rør placeret i indstrømningsbundens centrum, og hvor der i hvirvellagsapparatets gasudløbsstuds er anbragt elektriske temperaturreguleringsorganer, som er forbundet med indstillingsorganer for en doseringspumpe.The invention relates to a device for controlling the drying process in a fluidized bed dryer, in which solutions, melts or suspensions are dried to a granulate with the addition of condensation germs having a fluidized bed dryer and means for changing the temperature of the gas flowing through the inflow with a continuous granule outlet through a tube located in the center of the inflow floor, and in which the gas outlet nozzle of the fluidized-bed apparatus has electric temperature control means, which are connected to setting means for a metering pump.
10 I et kendt apparat (DD-patentskrift 119.304), i hvilket opløsninger, smelter eller suspensioner tørres i et hvirvellag, føres det flydende produkt gennem dyser ind i et hvirvellag bestående af partikler af samme stof som produktet. Tørgassen, som holder hvirvellaget i svævetilstand, træder med høj temperatur ind i laget gennem en indstrømningsbund. Ved fordampnin-15 gen af væsken fjernes der varme fra tørgassen, og det faste stof tørrer på de af samme stof bestående partikler i laget, hvorved disse partikler forstørres.In a known apparatus (DD patent 119,304) in which solutions, melts or suspensions are dried in a fluidized bed, the liquid product is passed through nozzles into a fluidized bed consisting of particles of the same substance as the product. The dry gas, which keeps the fluidized bed in the hovering state, enters the layer with a high temperature through an inflow bottom. Upon evaporation of the liquid, heat is removed from the dry gas and the solid dries on the particles of the same substance in the layer, thereby enlarging these particles.
Når de har nået en bestemt størrelse, forlader faststofpartiklerne hvirvellaget gennem et klasserende afløb. Alt efter faststofpartiklernes væskeindhold og stofovergangsbetingelseme i hvirvellaget samt luftens indløbstempera-20 tur og fugtighed fordampes der mere eller mindre vand, hvilket medfører en varierende luft- og faststofudløbstemperatur, hvorved arbejdsmåden kan fjerne sig fra det energetisk optimale driftspunkt, og resultatet kan blive skader, fx. ved overhedning af produktet.Once they reach a certain size, the solid particles leave the fluidized bed through a gradient drain. Depending on the liquid content of the solid particles and the dust transition conditions in the fluidised bed, as well as the inlet temperature and humidity of the air, more or less water is evaporated, which results in a varying air and solids outlet temperature, whereby the working method can remove from the energetically optimum operating point and the result can be damage, e.g. . by overheating the product.
Endvidere kendes en fremgangsmåde (CH-patentskrift 558 674), ved 25 hvilken en optimal stationær driftstilstand reguleres ved mængde- og tidsmæssig tilbageføring af fine bestanddele eller ved væsketilførsel og/eller gasstrømmens temperatur i afhængighed af temperaturfaldet i hvirvellaget.Furthermore, there is known a method (CH patent 558 674) in which an optimal steady state operation is controlled by the quantitative and temporal return of fine components or by the liquid supply and / or the gas flow temperature, depending on the temperature drop in the fluidised bed.
Den fundne regulering til komstørrelsesfordeling beror på den erkendelse, at der består en funktionel sammenhæng mellem gassens temperaturfald og 30 komstørrelsesfordelingen. Løsningen er fundet til frembringelse af et ensartet granulat og er ikke anvendelig til kvalitetsrigtig tørring af smelter, suspensioner og opløsninger. Bortset herfra retfærdiggør det store maskin-bygningstekniske opbud (vindretterkammer) heller ikke anvendelsen til tørring af de ovennævnte medier.The found control for grain size distribution depends on the recognition that there is a functional correlation between the temperature drop of the gas and the grain size distribution. The solution has been found to produce a uniform granule and is not applicable to high-quality drying of melts, suspensions and solutions. Apart from this, the large machine-building technical auction (wind chambers) also does not justify the use for drying the above media.
35 Fra DE-fremlæggelsesskrift 1.241.365 kendes en hvirvellagstørrer, som er forsynet med i hvirvellagsapparatets gasudløbsstuds anbragte, elektriske temperaturreguleringsorganer, som er forbundet med indstillingsorganer -2- DK 167128 B1 for en doseringspumpe. Hvis fx. væskekoncentrationen ændres, kan tørringstemperaturen overskride grænsen for beskadigelse af granulatet eller den eventuelt varmefølsomme opløsning.35 from DE-presenting specification 1.241.365, a vortex layer dryer is known, which is provided with electric temperature control means arranged in the gas outlet plug of the vortex unit, which are connected to setting means -2 for a metering pump. If e.g. if the liquid concentration is changed, the drying temperature may exceed the limit of damage to the granulate or any heat sensitive solution.
Det er derfor opfindelsens opgave at tilvejebringe en reguleringsind-5 retning, som under hensyntagen til parametrene, fx. fugtighedsindholdet i det faste stof, stofovergangsbetingelser i hvirvellaget eller luftens indløbstemperatur og/eller fugtindhold, opretholder det energetisk optimale driftspunkt.It is therefore the object of the invention to provide a control device which, taking into account the parameters, e.g. the moisture content of the solid, dust transition conditions in the fluidised bed or the inlet temperature of the air and / or moisture content maintain the energetically optimum operating point.
Denne opgave løses ifølge opfindelsen ved, at temperaturregulerings-10 organerne yderligere er forbundet med indstillingsorganer for en kimtilførselsindretning samt med et indstillingsorgan for en reguleringsventil i en vandtilførselsledning, der ender i en i hvirvellaget indragende dyse, hvor det indstillede forhold mellem tilført væske og tilført kimmasse andrager 10 - 1000, fortrinsvis 50.This task is solved according to the invention in that the temperature control means are further connected with setting means for a seed supply device and with a setting means for a control valve in a water supply line ending in a fluidized nozzle in which the adjusted ratio between the supply of liquid and the applied seed mass is 10 - 1000, preferably 50.
15 En regulering tilvejebringes ved fx. temperaturfald i afgangsgassen til under en fastsat tærskel gennem en drøvling af væsketilførslen frå doseringspumpen proportionalt med temperaturformindskelsen uden formindskelse af kimtilførslen, og ved fx. overskridelse af en øvre grænsetemperatur gennem tilførsel af vand proportionalt med temperaturforøgelsen.A control is provided by e.g. temperature drop in the exhaust gas to below a set threshold through a dosing of the liquid supply from the dosing pump proportional to the temperature decrease without reducing the germ supply, and by e.g. exceeding an upper limit temperature through the supply of water proportional to the increase in temperature.
20 Opfindelsen er nærmere forklaret i det følgende under henvisning til tegningen, som skematisk viser en hvirvellagstørrer med en reguleringsindretning ifølge opfindelsen.The invention is further explained in the following with reference to the drawing which schematically shows a fluidized bed dryer with a control device according to the invention.
De i hvirvellagsapparatet l’s gasudløbsstuds 7 værende temperaturreguleringsorganer 2 regulerer gennem indstillingsorganer doseringspum-25 pen 3 og kimtilførslen 4 således, at mængden af væske og af tilførte kim forøges, når temperaturen i gasudløbsstudsen 7 stiger over en indstillet optimalværdi. I denne forbindelse er det ligegyldigt ved hvilke parametre, fx. varierende væskekoncentration eller ændring af gasindløbstemperaturen, denne temperaturforøgelse blev fremkaldt. Som følge af forøgelsen af den 30 tilførte væskemængde og forskydningen af partikelspektret i hvirvellaget ved ændring af kimtilførslen fordampes der mere væske, og gasudløbstemperaturen synker. Hvis indreguleringen af optimalværdien ikke kan ske, til trods for maksimale udslag af begge indstillingsorganer, åbnes indstillingsorganet for en yderligere reguleringsventil, og vanddoseringpumpen 5 35 sættes i drift og pumper vand gennem dysen 6 ind i hvirvellaget. Som følge af vandtilførslen undgås en produktbeskadigelse på grund af en overophedning, trods ekstreme driftstilstande. Hvis afgangsgastemperaturen afvi- -3- DK 167128 B1 ger nedad fra det optimale driftspunkt, styrer reguleringsorganerne således, at væsketilførslen ganske vist drøvles, men kimtilførslen bliver stående på den optimale driftsværdi.The temperature regulating means 2 of the gas outlet nozzle 1 of the vortex nozzle 7 regulate through the adjusting means the metering pump 3 and the germ supply 4 such that the amount of liquid and of the germs supplied increases as the temperature in the gas outlet nozzle 7 rises above a set optimum value. In this connection, it does not matter what parameters, e.g. varying fluid concentration or change of gas inlet temperature, this temperature increase was induced. As a result of the increase in the amount of liquid supplied and the displacement of the particle spectrum in the vortex by changing the seed supply, more liquid is evaporated and the gas outlet temperature decreases. If the adjustment of the optimum value cannot be achieved, despite the maximum triggering of both adjusting means, the adjusting means is opened for a further control valve and the water dosing pump 5 35 is put into operation and pumps water through the nozzle 6 into the vortex layer. Due to the water supply, product damage is avoided due to overheating, despite extreme operating conditions. If the exhaust gas temperature deviates from the optimum operating point, the regulators control such that the liquid supply is admittedly drowning, but the germ supply remains at the optimum operating value.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DD20605178 | 1978-06-16 | ||
DD20605178A DD137005A1 (en) | 1978-06-16 | 1978-06-16 | DEVICE FOR REGULATING THE DRYING PROCESS IN SWIVEL LAYER DRYERS |
Publications (2)
Publication Number | Publication Date |
---|---|
DK245979A DK245979A (en) | 1979-12-17 |
DK167128B1 true DK167128B1 (en) | 1993-08-30 |
Family
ID=5513104
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DK245979A DK167128B1 (en) | 1978-06-16 | 1979-06-13 | DEVICE FOR REGULATING THE DRYING PROCESS IN A WHEEL LAYER |
Country Status (8)
Country | Link |
---|---|
AT (1) | AT379890B (en) |
BG (1) | BG32209A1 (en) |
CS (1) | CS249752B1 (en) |
DD (1) | DD137005A1 (en) |
DE (1) | DE2912429A1 (en) |
DK (1) | DK167128B1 (en) |
RO (1) | RO84516B (en) |
SU (1) | SU1004723A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD215379A1 (en) * | 1983-05-30 | 1984-11-07 | Thaelmann Schwermaschbau Veb | PROCESS AND DEVICE FOR PREPARING GERMES FOR SWIVEL LAYERED GRANULAR DRYING |
DE4029525A1 (en) * | 1990-09-18 | 1992-03-19 | Umwelt & Energietech | METHOD AND DEVICE FOR DRYING SOLID MATERIALS IN AN INDIRECTLY HEATED FLUIDIZED BED |
GB2384161A (en) * | 2001-12-04 | 2003-07-23 | Powder Conditioning Ltd | Conditioning powders |
CN106766818B (en) * | 2017-01-10 | 2023-06-16 | 楚雄医药高等专科学校 | Energy-saving efficient airflow dryer for Yi medicine extracts and drying method thereof |
-
1978
- 1978-06-16 DD DD20605178A patent/DD137005A1/en unknown
-
1979
- 1979-03-29 DE DE19792912429 patent/DE2912429A1/en not_active Withdrawn
- 1979-04-03 AT AT245779A patent/AT379890B/en not_active IP Right Cessation
- 1979-05-22 SU SU797770596A patent/SU1004723A1/en active
- 1979-05-23 BG BG7943703A patent/BG32209A1/en unknown
- 1979-05-24 CS CS359579A patent/CS249752B1/en unknown
- 1979-06-13 DK DK245979A patent/DK167128B1/en not_active IP Right Cessation
- 1979-06-14 RO RO97848A patent/RO84516B/en unknown
Also Published As
Publication number | Publication date |
---|---|
CS249752B1 (en) | 1987-04-16 |
DE2912429A1 (en) | 1980-01-31 |
BG32209A1 (en) | 1982-06-15 |
DD137005A1 (en) | 1979-08-08 |
RO84516B (en) | 1984-08-30 |
AT379890B (en) | 1986-03-10 |
SU1004723A1 (en) | 1983-03-15 |
ATA245779A (en) | 1985-07-15 |
DK245979A (en) | 1979-12-17 |
RO84516A (en) | 1984-06-21 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
B1 | Patent granted (law 1993) | ||
PBP | Patent lapsed |