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Dryers2019-01-10T01:07:02+02:00

Dryers

Dryers are intended for technological drying of material, where, in addition to water, solvent emissions may also be created.

They are used in wood processing, insulation material production, asphalt concrete base production, the concrete industry, paint industry, sintering industry, the pharmaceutical industry and others.

“Only the technologically most advanced dryers work like NATURE – strive for BALANCE.”

  • Drying is the process in which moisture exists products, mainly water at first and finally other particles (should they exist).
  • The water evaporates from the surface, during which there needs to be a difference in the air and surface moisture for the moisture to transition from the surface and be released into the air.
  • As nature always strives for balance, humidity transitions from the area with higher humidity to the area with lower humidity. This is why with our technical dryers we make use of the fact that the air will allow for different humidity levels depending on the temperature. Thus, for example, the air is saturated with 49.52g at 40°C (X absolute moisture), with 87.52g at 50°C and with 1459g at 90°C.

“Do you know the processes behind successful drying?
EVENNESS and ACCELERATION.”

  • The drying process is made up of two complementing processes: water vapour from the surface and the transition of water from the inner towards the outer surface
  • Drying is successful only when the two processes take place uniformly
  • The allowed speed of drying is based on the structure of substances being dried
  • With certain non-sensitive materials drying can take place faster, whereas others may take longer to dry
  • Once we are conscious of the importance of both processes, drying itself can be accelerated (especially with the material that takes longer to dry)!

The image shows diffusion (the “water bubble” path) towards the surface of the plate. Using the entire surface of the plate we blow the hot air and so the “water bubbles” are released into it the air.

Dryers are equipped with at least one air flow ventilators (a ventilation system), burner system, moisture derivation system, fresh air supply, transport system so material can be transported to and from the dryer

In regards to the mode of transport of the materials, dryers can be chamber or continuous.

“Changing conditions or transport during changing conditions – CHAMBER or CONTINUOUS DRYERS. “

In a chamber dryer, the drying process occurs in the same area from start to finish, whereas in the chamber dryer products are transported in different stages of drying

Chamber dryers are well-suited for the production of a large selection of products in smaller series, that do not call for a continuous production process

Continuous dryers, on the other hand, guarantee continuous production and are intended for drying larger series of products

Continuous devices are more energy efficient.

“Will you avoid the most common drying mistakes?”

When drying raw products, unwanted, usually wide, cracks may appear on a rough surface.

Such mistakes occur as a result of unsuitable conditions and an incorrect drying regime.

Products may shrink during drying, caused by pressure created due to the differences in shrinking between the inner and outer mass of the product, which leads to cracks.

Cracks can be avoided by ensuring minimal differences in moisture along the depth product.

Balance is maintained by the changing temperature and relative moisture in the chamber.

We can begin the drying process by increasing the temperature and lowering the  relative moisture in the chamber; as the shrinking process and the capillary transfer of moisture slows down, the moisture level on the product will drop bellow the critical limit. The speed, however, will depend on the available time and the optimal energy use of the warm air.

The increased speed of drying can lead to products drying too fast around the edges, leading to further deformations of product surfaces.

The intervals between the products on the drying shelves can also lead to such mistakes. As a result, there are differences in the level of dryness between the products from the edge of the shelf and those in the middle. This can be solved by increasing the air supply along the entire surface of the drying shelf.

Cracks an also occur in areas where the products and the drying shelf come into contact. This can be avoided by ensuring that the products are placed as closely together on the shelf as possible.

“Ensuring maximum operational safety with dryers using paints and other materials producing solvents DRYING-CURING CHAMBER”

Dryers in which moisture and parts of solvents are released into the air are usually called drying-curing chambers. In addition to fulfilling drying criteria, they also need to adhere to safety regulations.

Should they not fulfil operational safety criteria, such chambers become a safety hazard with a risk of explosion occurring. This is why special attention needs to be given to the fulfilling the guidelines set out by the SIST EN 1539 standard.

“We are now safe from explosions.
Standard SIST EN 1539 – Drying chambers and ovens in which flammable compounds are released into the air: safety requirements.”

With special technical measures we can ensure that the concentration of flammable explosive compounds in the drying chamber is at most 25 % MEC (min. explosive concentration).

Special attention is also given to measures guaranteeing that the said limit is not exceeded in states of emergency–e.g. when electrical supply is halted, production stopped, the allowed temperature is exceeded etc.

All these are reason why, as part of monitored security measures, a programmable controller needs to be carefully selected, in combination with other security elements reaching the SIL standards, set on the basis of a security analysis.

Dryers
Chamber dryer
Continuous dryer
Rotary dryer
Dryer with carts
Chain dryer

Dryers

Dryers are intended for technological drying of material, where, in addition to water, solvent emissions may also be created.

They are used in wood processing, insulation material production, asphalt concrete base production, the concrete industry, paint industry, sintering industry, the pharmaceutical industry and others.

“Only the technologically most advanced dryers work like NATURE – strive for BALANCE.”

  • Drying is the process in which moisture exists products, mainly water at first and finally other particles (should they exist).
  • The water evaporates from the surface, during which there needs to be a difference in the air and surface moisture for the moisture to transition from the surface and be released into the air.
  • As nature always strives for balance, humidity transitions from the area with higher humidity to the area with lower humidity. This is why with our technical dryers we make use of the fact that the air will allow for different humidity levels depending on the temperature. Thus, for example, the air is saturated with 49.52g at 40°C (X absolute moisture), with 87.52g at 50°C and with 1459g at 90°C.

“Do you know the processes behind successful drying?
EVENNESS and ACCELERATION.”

  • The drying process is made up of two complementing processes: water vapour from the surface and the transition of water from the inner towards the outer surface
  • Drying is successful only when the two processes take place uniformly
  • The allowed speed of drying is based on the structure of substances being dried
  • With certain non-sensitive materials drying can take place faster, whereas others may take longer to dry
  • Once we are conscious of the importance of both processes, drying itself can be accelerated (especially with the material that takes longer to dry)!

The image shows diffusion (the “water bubble” path) towards the surface of the plate. Using the entire surface of the plate we blow the hot air and so the “water bubbles” are released into it the air.

Dryers are equipped with at least one air flow ventilators (a ventilation system), burner system, moisture derivation system, fresh air supply, transport system so material can be transported to and from the dryer

In regards to the mode of transport of the materials, dryers can be chamber or continuous.

“Changing conditions or transport during changing conditions – CHAMBER or CONTINUOUS DRYERS. “

In a chamber dryer, the drying process occurs in the same area from start to finish, whereas in the chamber dryer products are transported in different stages of drying

Chamber dryers are well-suited for the production of a large selection of products in smaller series, that do not call for a continuous production process

Continuous dryers, on the other hand, guarantee continuous production and are intended for drying larger series of products

Continuous devices are more energy efficient.

“Will you avoid the most common drying mistakes?”

When drying raw products, unwanted, usually wide, cracks may appear on a rough surface.

Such mistakes occur as a result of unsuitable conditions and an incorrect drying regime.

Products may shrink during drying, caused by pressure created due to the differences in shrinking between the inner and outer mass of the product, which leads to cracks.

Cracks can be avoided by ensuring minimal differences in moisture along the depth product.

Balance is maintained by the changing temperature and relative moisture in the chamber.

We can begin the drying process by increasing the temperature and lowering the  relative moisture in the chamber; as the shrinking process and the capillary transfer of moisture slows down, the moisture level on the product will drop bellow the critical limit. The speed, however, will depend on the available time and the optimal energy use of the warm air.

The increased speed of drying can lead to products drying too fast around the edges, leading to further deformations of product surfaces.

The intervals between the products on the drying shelves can also lead to such mistakes. As a result, there are differences in the level of dryness between the products from the edge of the shelf and those in the middle. This can be solved by increasing the air supply along the entire surface of the drying shelf.

Cracks an also occur in areas where the products and the drying shelf come into contact. This can be avoided by ensuring that the products are placed as closely together on the shelf as possible.

“Ensuring maximum operational safety with dryers using paints and other materials producing solvents DRYING-CURING CHAMBER”

Dryers in which moisture and parts of solvents are released into the air are usually called drying-curing chambers. In addition to fulfilling drying criteria, they also need to adhere to safety regulations.

Should they not fulfil operational safety criteria, such chambers become a safety hazard with a risk of explosion occurring. This is why special attention needs to be given to the fulfilling the guidelines set out by the SIST EN 1539 standard.

“We are now safe from explosions.
Standard SIST EN 1539 – Drying chambers and ovens in which flammable compounds are released into the air: safety requirements.”

With special technical measures we can ensure that the concentration of flammable explosive compounds in the drying chamber is at most 25 % MEC (min. explosive concentration).

Special attention is also given to measures guaranteeing that the said limit is not exceeded in states of emergency–e.g. when electrical supply is halted, production stopped, the allowed temperature is exceeded etc.

All these are reason why, as part of monitored security measures, a programmable controller needs to be carefully selected, in combination with other security elements reaching the SIL standards, set on the basis of a security analysis.

Dryers
Chamber dryer
Continuous dryer
Rotary dryer
Dryer with carts
Chain dryer

Procesni
inženiring
d.o.o.

Plin v
Industriji z intenzivno energetsko usmeritvijo.

T +386 (0)1 7220 900
E procesni@siol.net
W www.procesni.si

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