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Working Principle:
The size, shape, geometric arrangement
and peripheral speed of the ploughs are coordinated to force the product into a tree dimensional motion.
The effect is increased by independently driven high speed choppers which also disperse agglomerations
in the the product, thus creating a virtual mechanical fluid bed of the product being is procesed.
Basically, heat is transferred to the product by its very frequent contact with the heated wall of the
equipment.Due to the effective movement of the material, almost the entire surface of the container is
available for effective heat transfer unlike the slow moving paddles or ribbons where only the bottom
portin of the trough is effective. As a result the equipment is more compact.
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Applications:
The most important application of
FABDOTHERM DRYER is for vacumm drying. The operating vacumm depends mostly on the type of the product
moisture and the condensation temprature.
Normal products to be dried can be divided into suspensions,pastes and bulk goods.
Drying pastes and suspensions is particularly problematic as these products are frequently subject to more
or less viscous phases at certain moisture percentage whereby lumps are formed.These viscous phases are rapidly treated
by the coordination of the ploughs and the choppers in the FABDOTHERM.
The FABDOTHERM DRYER can also be used as an effective Airflow Dryer which can achieve higher evaporation than vacumm drying for products
with relatively low initial moisture i.e. around 20% and when the product is hygroscopic.
FABDOTHERM DRYERS have been effectively used:-
1. In the Chemical industry for moulding powders, refined
chemicals,agrarian chemicals,fibre mixing etc.
2. In the Food industry for cocoa conditioning,
chocolate fillings etc.
3. In the Pharmaceutical industry for antibiotics and other drug mixtures.
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Advantages:
FABDOTHERM DRYERS are convincigly superior
to the other dryers and more so when the drying operation is preceded by unit operation of mixing or reactions
between solid-solid, solid-liquid or solid-gaseous.
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Notable Advantages:
- Quick drying
- Uniform thermal treatment of the product
due to thorough mixing.
- Economical recovery of solvents.
- Minimum enviromental pollution.
- Very versatile.
- Operation is very simple and minimal manpower is called for.
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Construction to Suit Process Requirement:
- The dryer can be supplied in various materials of construction
like: M.S., SS-304, SS-316, Hastealloy, Monel, Abrasion resistant materials etc
- Choice of pressure or vacumm suitablity depending on the process.
- Batch or continuous operation based on retention time.
- Additional elements and constructional features to suit vacumm drying application.
- Choice of machanical seals to suit process requirements.
- Sanitary Design for pharmaceutical, food and like applications.
- Variable speed drives where necessary.
- Injection nozzles, Vessel connections, Internal finish, Vapor dome, Reflux condenser, Mist eliminator,
Cryogenic design etc. can be supplied to suit process requirements.
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Fabdecon Customer Service Laboratory:
FABDECON's fully equipped pilot plant
facilities enale establishing suitability of the equipment for specific process requirment.Also it helps
develop design data for production unit.Thus qualitative and quantitative data generated from pilot plant renders no risk on the part
f the customer for scaled up model.Pilot trials can be conducted at nominal charges which are adjusted
against one order if and when materiailized.
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Mode of Operation
FABDOTHERM Vacumm-Dryer:
The dry product enters the dryer through a sufficiently dimensioned
hopper which is equipped with a slide, a valve or simply with a lid.The rotating shovels distributive the product
uniformly in the equipment.After filling,the drying system is evacuated to the working pressure.The vapours flow through the filter, in
which the solid particles are seperated out.
The drying process is supervised by measuring the product temperature.The product temperature at any one point is representative for the entire batch, due to the intensive
mixing procedure, and a uniform and protective drying process is thereby guaranteed. After drying, the batch can be cooled to pack or store by circulating a cooling agent
in the jacket.
In some cases it is necessary to intermix product components of differing composition into the dried product.This process can be carried out in the
actual dryer, due to the thorough mixing.
The dryer is discharged by opening a flush fitted valve in the bottom portin of drum.
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Mode of Operation
FABDOTHERM Airflow-Dryer:
The drying energy of the airflow-dryer is introduced
to appox. 70% through the heated drum wall. The gas flowing through the dryer, in the case of inflammable
solutions -inert gas, collects the vapours and transports them to the condenser.The solid particles carried
with the vapours are either seperated out in a filter or in a cyclone, according to the particular case.
Before gas enters the dryer it is converted to drying temprature in a heat exchanger.
Products moistened by water are subjected to throughflow operation and products moistened by solutions are
subjected to the process of circulation.A mixing process can also be included in the latter case.
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