Project Targets

PRE-UPGRADE EXIT AIR MAPPING AND ENGINEERING ANALYSIS OF COOLING TOWER PERFORMANCE WITH A MOBILE ROBOT UNIT

For estimating the local characteristics of cooling towers, i.e. isolation of distribution problems of the fluid, usually measurements of temperature and velocity field in a measuring plane above the water distribution area are implemented. These measurements are normally performed via a diagnostic testing technique known as "exit air mapping", i.e. by mounting a large number of 200 to 400 velocity and temperature sensors, depending on the size of the cooling tower and requirements of the analysis, approximately 1 to 2 m above the water distribution surface.

These measurements are, above all, time consuming. Furthermore, preparations are linked with halting the power plant operation. Consequently the above mentioned measurements are not regularly performed and consumers usually decide for reconstruction of their cooling towers on the basis of integral characteristics, numerical modelling and/or insufficient empirical estimations.

Due to these basic difficulties of the classic, static measuring method being costs and relative long halting times, the described method is modified to enable the analysis of space and time characteristics of velocity and temperature fields in cooling towers without operation halting. Therefore a dynamic on-line method of temperature and velocity field measurements in cooling towers in dependence of integral characteristics of the entire power plant system is developed.

The development procedure is based on existing measuring methods and on the development of a servo-positioning system on which measuring elements (anemometer and thermometer) are mounted. The measuring system includes a system for navigation in the measuring plane, processor unit supervising the motion of servo-positioning system (tracked vehicle) and storing the measuring values.
...continue next page