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 measured value. Accordingly, it is difficult to determine the moisture content in the inner core of a drying brick. By means of an ultrawide band microwave radar system (UWB radar), it is possible to observe the drying process of green bricks. Based on a comparison with a simulation of the drying process in the Delphin programme and implementation of the measurement results in the ZiTro programme developed specifically for the brick and tile industry, the spatial moisture distribution in green bricks at different times can be determined. For the measurement and the simulation, the climate data and the corresponding material properties are needed.

In the talk, the measurement system and measurements under laboratory conditions are presented. Possibilities for determination of the core moisture by means of the application-oriented dielectric moisture measurement system and the limitations derived from the results obtained are discussed.

Dr. Ralf Wagner, Material Research and Testing Institute at Bauhaus University of Weimar; Dr. Anne Tretau, Institut für Ziegelforschung Essen e.V.

x

Related articles:

Issue 2017-6

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...

more
Issue 2015-8

Innovative humidity measurement method for high moisture content of building materials

A wide range of measurement methods is available for determining material moisture. In the talk, the methods are briefly classified and their advantages and disadvantages compared. On the back of...

more
Issue 2009-11

ACO moisture measurement systems – the innovation at Wienerberger, Deest/Netherlands

At the location Wiener- berger Deest (Nether­lands), moisture measurement in clay has always been an important subject. With an accurate and reliable measurement, production failures due to too high...

more
Issue 2010-02

Moisture measurement at high temperatures and in dust-laden processes

The robust, patented vereta high-temperature moisture sensor AFS-HT300, which measures absolute moisture levels according to the dew-point principle, has a working temperature range that peaks at...

more
Issue 2014-08

Measuring green-product moisture

All regular-market measuring systems determine the water content of a given medium by indirect means, i.e., by exploiting a certain physical effect. The consequences of a change in moisture content...

more