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Spray Dryer

Spray Dryer
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Spray drying is the transformation of feed from a fluid state into a dried form by spraying the feed into a hot drying medium. The feed is pumped from the product feed tank to the atomizing device, located in the air disperser at the top of the drying chamber. The drying air is drawn from the atmosphere via a filter by a supply fan and is passed through the air heater to the air disperser. The atomized droplets meet the hot air and the evaporation takes place, while cooling of the air happen simultaneously. In Spray Drier, after the spray is dried in the drying chamber, the majority of the dried product falls to the bottom of the chamber and enters to a pneumatic conveying and cooling system. The fines, which are the particles with a small diameter, will remain in the air, and it is therefore necessary to pass the air through cyclones to separate the fines. The fines leave the cyclone at the bottom via a locking device and enter the pneumatic system, too. The air passes from the cyclone to the atmosphere via the exhaust fan. The two fractions of powder are collected in the pneumatic system for conveying and cooling and are passed through a cyclone for separation, after which they are bagged off. The instrumentation comprises indication of the temperature of the inlet and outlet air, as well as automatic control of the inlet temperature by altering the steam pressure, amount of oil or gas to the air heater, and automatic control of the outlet temperature by altering the amount of feed pumped to the atomizing device.

Product Details :
ApplicationIndustrial
MaterialStainless Steel, Mild Steel
Material GradeSS 304, 316
Power SourceElectric
Voltage220 V
Frequency50 - 60 Hz


There are two basic types of atomization :
  1. Nozzle atomizer
  2. Disc atomizer

Spray Drier Configuration :
  1. Co-Current Flow
  2. Counter Current Flow

Advantages Of Using A Spray Dryer For Drying Application :
  1. Control of particle size. Spray dryers can typically produce between 30 to 500 micron average particle sizes, in a bell shaped distribution.
  2. The shape of most spray dried particles is spherical, which provides for fluid-like flow properties.
  3. Spray drying produces the most homogeneous product.
  4. Many heat sensitive products can be spray dried easily at relatively high inlet temperatures.
  5. Permits drying without thermal degradation.






Forced Circulation Evaporators

Forced Circulation Evaporators
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These types of evaporators are recommended for the concentration of high viscosities solutions/slurries which have a tendency to crystallize or produce scales.The circulating product is heated when it flows through the heat exchanger and then partially evaporated when the pressure is reduced in separator. The liquid product is typically heated only a few degrees for each pass through the heat exchanger.This type of evaporator is also used in crystallization applications because no evaporation and therefore no concentration increase, takes place in the heat transfer surface. Evaporation occurs as the liquid is flashed evaporated in flash vessel/separator.

Product Details :
MaterialStainless Steel, Mild Steel
Power SourceElectric
Voltage380 to 415 V
Frequency50 - 60 Hz
ApplicationIndustrial
GradeSS 304, 316


Advantage :
  • Ideal for high crystallizing and high viscosity solutions amp; Slurries.
  • Single or multiple effect evaporation
  • High operational flexibilities, heat transfer co-efficient, vapours liquid separation.
  • Low temperature rise operation.
  • Minimized fouling due to high velocities amp; static head.
  • High turn down ration.






Multiple Effect Evaporators

Multiple Effect Evaporators
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Evaporators are thermal concentrators for concentrating dilute liquid for increasing the solids content and for reducing volume of evaporating liquid, widely used for the concentration of liquids in the form of solutions, suspensions and emulsions.

Product Details :
ApplicationIndustrial
Automatic GradeAutomatic
MaterialStainless Steel, Mild Steel
Power SourceElectric
Voltage220 V
Frequency50 - 60 Hz
GradeSS 304, 316


Forced Circulation EvaporatorsFalling Film EvaporatorsRaising Film Evaporators
ProductHeat ExchangerProductHeadProductHeating System
VapourSeparatorVapourCalandriaVapourCondensate
ConcentrateCirculation PumpHeating SteamCal. Lower PartConcentrate
Heating SystemConcentrate PumpCondensateVap. Separator
Condensate


Multiple Effect Evaporator (MEE) :
In Multiple Effect Evaporators (MEE), there is a conservation of heat as steam from the boiler is used for the first effect and then the vapour generated from the product is used as the heat source in the second effect. The vapour generated here is then used as the heat source in the third effect and finally heats water for some other process or preheats the incoming feed.

Multiple Effect Evaporator - Effluent Treatment :
Evaporators are used to convert entire quantity of effluent to zero liquid discharge by separating water and salt using evaporation and separation technology by concentrating the effluent to the saturation level and subsequent separation of salt and water through centrifuging and drying.Industries like Textile Dying, Pharmaceutical & Drug Industries, Pulp mills etc. during the manufacturing process generates huge quantity of high toxic effluents which has high BOD, COD, TS and TDS level with black coloured and odour effluent. To overcome all the environmental problems, Zero Liquid Discharge Effluent System is required depending upon the type of effluent for evaporation and drying.




Falling Film Evaporators

Falling Film Evaporators
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The falling film evaporator consists of shell and tube heat exchanger called as calandria that is mounted in vertical position. The liquid product enters the evaporator at the head and is evenly distributed to the heating tubes. A thin film enters the heating tube and flows downwards at boiling temperature through the steam in the jacket and is partially evaporated. The vapour is separated from the liquid in vapour separator and the concentrated liquid is collected at the bottom or transferred to the next stage. The falling film evaporators can be single effect or multiple effects depending on the capacity. Falling film evaporators can be operated with small temperature differences between the heating media and the boiling liquid and they also have short product contact time. These characteristics make the falling film evaporator particularly suitable for heat sensitive products and it is the most frequently used evaporator.

Product Details :
Automatic GradeAutomatic
MaterialStainless Steel, Mild Steel
Power SourceElectric
Voltage380 V
Frequency50 - 60 Hz


Advantage :
  • Ideal for clear, heat sensitive foaming and corrosive solutions.
  • Continuous, single pass operation with minimized retention time.
  • Single or multiple units with high heat economy.
  • High heat transfer co-efficient.
  • Low power requirement.
  • Simple construction.
  • Low floor space requirement.

Applications :
  • Food
  • Herbal extracts
  • Pharmaceuticals
  • Dairy
  • Dyestuff
  • Black liquid in paper amp; pulp.
  • Ammonium Nitrate.
  • Sugar Syrups.





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