Spray Dryers for Food & Dairy Powders
Source： | Date:
2010-10-30
| Hits:
Keywords:
Choosing the right spray dryer
YIBU has significant expertise within process equipment, including spray drying plants for the Food & Dairy industry. When selecting a spray drying plant, it is important to know the requirement to the end product. Should it be a regular product, or should it be agglomerated and instantly soluble in cold water? Should the spray drying plant be designed for CIP cleaning-in-place?
YIBU has significant expertise within process equipment, including spray drying plants for the Food & Dairy industry. When selecting a spray drying plant, it is important to know the requirement to the end product. Should it be a regular product, or should it be agglomerated and instantly soluble in cold water? Should the spray drying plant be designed for CIP cleaning-in-place?
The spray drying principle
In a spray dryer, water from the feedstock (concentrate) to be spray dried is evaporated from the surface of many small droplets (1 litre of concentrate is atomized to 1,5 x 1010 droplets with a diameter of 50 my with a total surface of 120 m2.) the small droplets are created by an atomizer- either a rotary wheel or a high pressure nozzle. The droplets are introduced into a hot airstream, which - due to the evaporation of the water from the concentrate - is cooled down. This now colder and humid air is discharged from the dryer and after separation of the now dry particles discharged into the atmosphere. The dry particles are - after separation from the process air - further cooled and bagged off.
In a spray dryer, water from the feedstock (concentrate) to be spray dried is evaporated from the surface of many small droplets (1 litre of concentrate is atomized to 1,5 x 1010 droplets with a diameter of 50 my with a total surface of 120 m2.) the small droplets are created by an atomizer- either a rotary wheel or a high pressure nozzle. The droplets are introduced into a hot airstream, which - due to the evaporation of the water from the concentrate - is cooled down. This now colder and humid air is discharged from the dryer and after separation of the now dry particles discharged into the atmosphere. The dry particles are - after separation from the process air - further cooled and bagged off.
The spray drying process
The spray drying process depends entirely on the composition of the product. Some are very easy and others very difficult to dry. In this context it should be stated that a YIBU spray dryer is designed and the process parameters selected to ensure as long operation time as possible, before it is necessary to stop the plant for cleaning. To support our design engineers when they select the drying parameters, we use the DRYNETICS™ single particle drying method developed by YIBU.
The spray drying process depends entirely on the composition of the product. Some are very easy and others very difficult to dry. In this context it should be stated that a YIBU spray dryer is designed and the process parameters selected to ensure as long operation time as possible, before it is necessary to stop the plant for cleaning. To support our design engineers when they select the drying parameters, we use the DRYNETICS™ single particle drying method developed by YIBU.
Below some basic principles are given to be used when a YIBU dryer is designed:
1. The total moisture content in the exhaust air is one of the most important parameters. It depends on the composition of the product, e.g. a product with high protein content can be dried at high total moisture content in the exhaust air, whereas a high carbohydrate content requires low moisture content to avoid sticking of powder in the chamber, ducts and cyclones.
This is also why the total moisture content in the ambient air is an important parameter to know before the plant is designed, as the "drying potential" is reduced if the ambient total moisture is high.
2. Another important parameter to know is the maximum solids content in the concentrate. This is viscosity-driven and as such also depending on the composition of the product. As a rule of thumb the following applies:
High fat content
• allows higher solids content.
• requires lower drying temperature in order to avoid sticking (i.e. low total moisture content in the exhaust air).
High protein content
• requires lower solids content due to viscosity (except for hydrolysed proteins).
• allows higher drying temperature without sticking (i.e. high total moisture content in the exhaust air).
• The higher protein content, the more difficult becomes the agglomeration process.
1. The total moisture content in the exhaust air is one of the most important parameters. It depends on the composition of the product, e.g. a product with high protein content can be dried at high total moisture content in the exhaust air, whereas a high carbohydrate content requires low moisture content to avoid sticking of powder in the chamber, ducts and cyclones.
This is also why the total moisture content in the ambient air is an important parameter to know before the plant is designed, as the "drying potential" is reduced if the ambient total moisture is high.
2. Another important parameter to know is the maximum solids content in the concentrate. This is viscosity-driven and as such also depending on the composition of the product. As a rule of thumb the following applies:
High fat content
• allows higher solids content.
• requires lower drying temperature in order to avoid sticking (i.e. low total moisture content in the exhaust air).
High protein content
• requires lower solids content due to viscosity (except for hydrolysed proteins).
• allows higher drying temperature without sticking (i.e. high total moisture content in the exhaust air).
• The higher protein content, the more difficult becomes the agglomeration process.
News
- 2024-06-08 > Exhibition Invitation |ACHEMA 2024, Germany
- 2019-06-15 > P-MECH CHINA 2019 YIBU BOOTH NO: N3B10a
- 2019-04-15 > YIBU will attend the 57th CIPM Exhibition held in Changsha in Hunan province
- 2018-12-28 > Actived carbon particle mesh belt dryer made for Ingrevity
- 2018-03-10 > big spin flash dryer and spray dryer delivery to pakistan and Italy customer on time
- 2017-12-29 > two sets high speed centrifugal spray dryers and three sets of drum dryre delivered to Indonesia
- 2017-08-24 > one set of LPG-100 spray dryer is delivered to America
- 2017-08-24 > Five layers mesh belt dryer is sucessfully delivered to Manila(Philippines)
- 2017-04-05 > Exhibition interpack 2017 in Dusseldorf In Germany
- 2016-11-23 > The 18th International Exhibition in Moscow
Products
-
ZDG Series vacuum vibrating dryer（Specially for lithium battery) -
YQJ Series Rotary Disc Dryer（Horizontal rotary disc dryer/Horizontal rotary disc paddle dryer) -
LDG Series Vertical single-conical ribbon mixer dryer -
HYD Series Rotary Calciner (calcination kiln) -
GWD Series high temperature belt calciner -
FWD Series Multi-functions filter washing drying machine -
FGBX series Sealed -Circuit Circulation Fluidizing Dryer -
HDT Series Post Hopper Mixer( Post Bin Blender)
