X'inhu l-magna tat-tnixxif bl-isprej?
Magna tat-tnixxif bl-isprej fil-laboratorju, magħruf ukoll bħala dryer tal-isprej żgħir, huwa tip ta 'strument tal-laboratorju prinċipalment għall-ipproċessar ta' materjali likwidi. Ġeneralment, it-totalità dryer tal-isprej tal-laboratorju huwa kompatt fid-disinn u jista 'jiġi mċaqlaq. Il-magna hija awtonoma u ma teħtieġx faċilitajiet awżiljarji.
Spray dryer prinċipju tax-xogħol
Spray dryer prinċipju
Tnixxif bl-isprej teknoloġija huwa metodu sistematiku li huwa applikat għat-tnixxif tal-materjali. Permezz ta 'azzjoni mekkanika, tferrex il-materjali li għandhom jitnixxfu f'partiċelli fini ħafna li jixbħu ċpar, (iżżid iż-żona ta' evaporazzjoni ta 'l-ilma, tħaffef il-proċess tat-tnixxif) u kuntatt ta' arja sħuna, tneħħi l-biċċa l-kbira ta 'l-ilma f'mument, sabiex is-solidu materjal fil-materjal huwa mnixxef fi stat ta 'trab.
The air enters the air distributor at the top of the drying tower through the filtru and heater and then enters the drying chamber evenly in a spiral shape. The material liquid is sent from the material liquid tank to the centrifugal atomizer at the top of the drying tower by the filter and pump so that the liquid is sprayed into very small droplets. The end product is discharged from the bottom of the drying tower and the cyclone separator while the exhaust gas is discharged by the fan.
Spray dryer jaħdem fit-tliet metodi li ġejjin.
A. Pressure spray drying
a. The principle of the metodu ta 'tnixxif bl-isprej tal-pressjoni huwa li tuża pompa ta 'pressjoni għolja biex tiġbor materjali f'partiċelli taċ-ċpar 10-200 permezz ta' atomizzatur (pistola tal-isprej) fi pressjoni ta '70-200 atm biex tkun f'kuntatt dirett mal-arja sħuna. Imbagħad jitwettaq skambju tas-sħana u t-tnixxif jitlesta fi żmien qasir.
b. Basically, all apparat tat-tnixxif bl-isprej tal-pressjoni għandhom kanal ta 'gwida biex il-fluss tal-likwidu jdur. L-iskop tal-kanal tal-gwida huwa li jipprova jżid it-turbolenza tas-soluzzjoni waqt il-bexx.
B. Centrifugal Spray Drying
Il - prinċipju tal - metodu ta 'tnixxif bl-isprej ċentrifugali
a. Using a disc rotating at high speed in the horizontal direction to produce centrifugal force to the solution, so that it is thrown out at high speed to form a film, filament, or droplet.
b. Due to the effect of friction, obstruction, and tearing of air, the tangential acceleration is generated with the rotation of the disc, and the radial acceleration is generated by centrifugal force; maintain a combined speed of movement on the disc to form a spiral shape.
c. After the liquid is thrown from the disc along this spiral, they are dispersed into very small droplets, which move at an average speed along the tangential direction of the disc.
d. At the same time, the droplets are subject to the gravitational pull and fall.
e. Since the size of the particles sprayed is different, the flight distance of these drops is also different. Therefore, the particles fall at different distances to form a cylinder symmetrical to the center of the axis of rotation.
Rekwiżiti biex jinkisbu qtar uniformi fi dryer li jdur tal-laboratorju
a. Reduce the vibration when the disc rotates.
b. The amount of liquid entering the disc remains constant per unit of time.
c. The surface of the disc should be flat and smooth.
d. The circumferential rate of the disc should not be too small.
C. Airflow spray drying
Prinċipju tat-tnixxif bl-isprej tal-fluss tal-arja
a. The wet material enters the sprej dryer fl-istess ħin bħall-arja naturali msaħħna permezz tal-conveyor u tħallathom sewwa.
b. Due to the large heat mass exchange area, the purpose of evaporation and drying could be achieved in a very short period.
c. The end product after drying is discharged from the cyclone separator, and a small part of the flying powder is recycled by the cyclone dust collector or cloth bag dust collector.
Spray dryer partijiet
Sprej dryer fuq skala żgħira komponenti huma komposti minn torri tat-tnixxif, atomizzatur, separatur taċ-ċiklun, flixkun li jirċievi materjal, flixkun tal-ġbir tal-iskart, kompressur tal-arja, fann, korp tal-isprej dryer, u ċirkwit ta 'kontroll integrat.
Tipi ta 'magna tat-tnixxif bl-isprej
A. Vacuum spray dryer
B. Benchtop spray dryer
C. Spray drying oven
Applikazzjoni ta 'magna tat-tnixxif bl-isprej
Spray dryer teknoloġija tista 'tnixxef soluzzjoni u emulsjoni fi trab jew prodotti granulari direttament. Bl-użu ta 'dan il-metodu, il-proċessi ta' evaporazzjoni, konċentrazzjoni, tgħaffiġ u oħrajn jistgħu jitħallew barra, u l-prodotti miksuba mid-distribuzzjoni uniformi tal-partiċelli.
Karatteristiċi tal-magna tat-tnixxif bl-isprej
Tnixxif bl-isprej għandu l-karatteristiċi ta 'trasferiment mgħaġġel tas-sħana, evaporazzjoni mgħaġġla tal-ilma, u ħin tat-tnixxif immedjat. Il-prodott lest magħmul minn sprej dryer għandha kwalità tajba u prestazzjoni ta 'xoljiment. Spray dryers jista 'wkoll itejjeb ir-rata ta' dissoluzzjoni ta 'ċerti formulazzjonijiet. Barra minn hekk, il-magni jistgħu jintużaw ukoll biex jippreparaw mikrokapsuli.
Għal proprjetajiet fiżiċi differenti jew proprjetajiet kimiċi ta 'materjali, kif ukoll id-daqs u s-solubilità tat-trab jew partiċelli li jeħtieġ li jinkisbu mill-esperiment, ir-riċerkaturi jistgħu jeħtieġu tipi differenti ta' nixxiefa tal-isprej tal-laboratorju biex tikseb ir-riżultati sperimentali ideali.
Spray dryer applikazzjoni
A. Materials with high sugar content or heat sensitivity
Il-materjal b'kontenut ogħla ta 'zokkor jirreferi għal meraq tal-frott, mediċina tal-ħxejjex Ċiniża jew estratti ta' prodotti naturali, eċċ.; il-materjal b'sensittività tas-sħana jirreferi għall-preparazzjoni tal-enżimi batterji ħajjin, jew xi ħaġa bħal din.
Ħafna mill-materjali li fihom disaccharides polysaccharide għandhom punt ta 'tidwib baxx, li jagħmilhom jiddewweb meta jissaħħnu; u polysaccharide disaccharides faċli biex jassorbu l-umdità, hekk meta tuża a sprej dryer, huwa faċli li jidher il-fenomenu tal-ħajt li jwaħħal, u mhux faċli li tikseb trab jew granuli niexef tajjeb.
Barra minn hekk, meta l- magna tat-tnixxif bl-isprej jittratta l-preparazzjoni tal-enżimi, batterji ħajjin, u xi materjali tal-polimeru li huma faċilment denaturati taħt temperatura għolja, huwa faċli ħafna li tikkawża l-inattivazzjoni jew id-denaturazzjoni tagħhom. Biex issolvi din il-problema, tista 'tbaxxi t-temperatura tal-arja tad-dħul u t-temperatura tal-arja tal-ħruġ tal- sprej dryer.
B. Organic solvents or easily oxidized materials as solvents
Dejjem kien hemm problema ta 'tnixxif diffiċli ta' materjali ta 'solvent organiku tnixxif bl-isprej għal-laboratorju minħabba li s-solvent organiku ġenerali fih proprjetajiet fjammabbli u splussivi. L-emerġenza ta 'prova ta' splużjoni magħluqa nixxiefa tal-isprej tal-laboratorju jagħmilha possibbli li jiċċirkola l-materjal f'magħluq sistema tat-tnixxif bl-isprej. Anke jekk is-sistema kollha tkun mimlija b'gass inert (bħal nitroġenu jew argon), it-tnixxif tal-laboratorju magħluq kontra l-isplużjoni jista 'jevita b'mod effettiv il-kuntatt bejn gass solvent organiku u ossiġnu estern, u jiżgura produzzjoni sikura.
C. Materials of large granular powder
F'xi esperimenti, ir-riċerkaturi jeħtieġ li jiksbu xi kampjuni bi partiċelli kbar, bħall-industrija tal-katalist, li teħtieġ partiċelli ta 'madwar 100 mikron biex ikollha effett katalitiku aħjar. Iżda l-isprej ordinarju dryer jista 'biss jikseb il-partiċelli taħt it-30 mikron. ANTITECK, bħala wieħed mill- fornituri tat-tagħmir tat-tnixxif bl-isprej, joffri nixxiefa tal-isprej li jistgħu jagħmlu granuli ta 'madwar 100 mikron. Il-magna tippermetti wkoll il- granulazzjoni tal-isprej ta 'partiċelli żgħar ta' trab u jistgħu jiksbu partiċelli kbar ta '100 mikron jew aktar.
D. Ordinary materials
Riċerkaturi jistgħu jużaw nixxiefa tal-isprej tal-laboratorju għall-preparazzjoni ta 'trabijiet ordinarji jew it-tnixxif ta' materjali direttament. Dawn Magni tat-tnixxif bl-isprej huma żgħar fid-daqs, veloċi fil-veloċità, baxxi fl-istorbju, u faċli biex joperaw. It-trab imnixxef għandu sferiċità tajba u d-daqs tal-partiċelli huwa normalment imqassam.
Kif tuża magna tat-tnixxif bl-isprej?
a. Check whether the instrument is operating properly or not.
b. To ensure the purity of the end product, the operator should check the inside of each part of the instrument before operating the machine. Check carefully that the instrument connections are in place to avoid damaging the instrument or affecting the results during the experiment.
c. Turn on the power switch of the instrument.
d. Turn on the aspirator switch to allow air to flow through the system. It is recommended to set the aspirator to operate at 100%.
e. Set the inlet temperature and then turn on the heating switch. For aqueous samples, the inlet temperature should be set in the range of 100℃ to 220℃ (usually 150℃).
f. When reaching the preset inlet temperature, the operator should turn on the air compressor and adjust the needle valve on the miter tal-fluss. Typically, the adjustment is made to a height of 4 cm (approximately 600 L/ H).
g. Prepare distilled water and turn on the pompa peristaltika.
a) Press the sample tube onto the mercury and begin optimizing for optimal conditions. The pump is typically set at 30%.
b) If the outlet temperature is too high, the operator should lower the inlet temperature or increase the speed of the pump.
c) If the sample is not completely dry (wall sticking occurs), the operator may increase the inlet temperature or decrease the pump speed. Note: The temperature limit for the outlet temperature is the actual temperature that the product can withstand.
h. If the sample solution tends to clog the nozzle, the operator can turn on the nozzle cleaning switch to set the cleaning frequency.
i. When the machine is ready, the operator can convert the input from steaming water to a sample solution.
j. After sample injection, switch to distilled water to clean the tubing and nozzle.
NOTA: Din il-proċedura għandha titwettaq b'mod strett biex tiżgura li l-ebda kampjun ma jibqa' fit-tubi (speċjalment iż-żennuna).
k. When turning off the machine:
a) turn off the inlet temperature heating switch first to keep the aspirator operating;
b) Turn off the extractor until the outlet temperature drops below 70℃.
l. Remove the product.