Effective dryer control based on material-specific moisture content – Part 1: Material data

Drying green products is easily the most energy-intensive process step in clay brick and tile production. For the purpose of process control, it is interesting to know the distribution of moisture in the green products during drying. To this end, the measured value for the integral moisture content is coupled with a simulative calculation of the local moisture distribution. The measured value for the integral moisture is recorded with a new non-destructive measurement process to be developed, which takes shrinkage into account. With knowledge of the core moisture, drying control can be improved.

The sensor of the dielectric moisture measurement system is developed with consideration of the influence of drying shrinkage, moisture change and temperature on the permittivity. The determination of the variation of the hygro-thermal and the dielectric material properties during drying as well as their combination form the basis in this project. Part 1 focuses on an application-oriented presentation of the material properties.

Dr. Ralf Wagner, Material Research and Testing Institute at Bauhaus University of Weimar,

Dr. Anne Tretau, Brick and Tile Research Institute Essen Regd

x

Related articles:

Issue 2019-6

Effective dryer control

Non-destructive moisture measurement systems work from the surface to determine moisture content. As a result, the water content of near-sensor layers has the strongest influence on the delivered...

more

Patents December 2011

More patents: see german part. 1. Pan tile/roofing tile/ facade element with integrated solar module 2. Roof tile provided with solar cells 3. Ceramic article imaging process and and materials 4....

more
Issue 2015-8

54th Würzburg Brick and Tile Training Course

We shall present abstracts of all papers here: What makes our employees sick? Radioactivity of ceramic construction materials Clay brick and tile making – fit for the future? Avoiding...

more
Issue 2011-6

Enhancement of the hydrostatic capillary tension in wet brick green bodies for a reduced susceptibility to cracking during drying

1 Context and problem statement After shaping, brick green bodies exist as capillary-porous solids, the pores of which are filled with water and which are enclosed by a water sheath. Capillary suction...

more
Issue 2010-11

Improving the energy efficiency of drying installations with the use of modern low-energy dryers

1 Background In industrial countries green clay bricks and tiles are dried convectively with hot air produced by burners or other types of artificial energy supply. Drying is therefore associated with...

more