A High Temperature Anemometer (HTA) which allows the measurement of gas velocities in dusty atmospheres at temperatures up to 1400°C in the range between 1 and 40 m/s was developed. The most important features of this vane-anemometer are the frictionless aerostatic bearing and the internal air cooling. The frequency of rotation is detected by a high temperature resistant optical fibre. The frequency of rotation is proportional to the gas velocity. The instrument-head is mounted on a water-cooled probe of any necessary length up to 5 m. This is long enough for the most technical applications. A combined probe for simultaneous measurement of the local gas velocity and oxygen concentration was developed in co-operation with University of Magdeburg. A zirconium oxide sensor is attached to the HTA measuring head. The simultaneous measurement of the local gas velocity and oxygen concentration gives valuable information about the mixing in a reactor. The HTA-system is rugged, easy to handle and costs only a fraction of a comparable Laser Doppler Anemometer (LDA). The comparison of results obtained from HTA and LDA measurements in the flame of a coal fired burner are nearly identically. Over 30 successful measurements at different types of furnaces (coal and biomass fired boilers, CFB, waste incinerators,...) have been carried out until now.
|Effective start/end date||1/01/94 → 30/06/01|