Oil and turbidity alarms
An oil and turbidity detector is a warning device for monitoring water in a water circuit .
use
It serves u. a. to monitor the condensate flowing back into the boiler water circuit, provided there is a possibility of contamination with foreign substances such as oil , fat , whey , petrol, etc. These foreign substances can hinder the heat transfer in the boiler and lead to "foaming" and "spitting". This can entrain salty boiler water and damage the downstream steam lines, turbines, condensate lines etc. The idea of simply discarding the condensate when there is a risk of contamination is countered by the fact that the condensate contains a lot of energy that was previously generated in the process of steam generation (water treatment, degassing, chemical dosing, fuel use, etc.) is. TRD 604 in the national regulations and EN 12952 / -53 in the European regulations form the basis for the requirement for condensate monitoring.
function
Oil and turbidity alarms are used to monitor the quality of the condensate flowing back into the boiler water circuit. The system is based on transmitted light or scattered light measurement. If the scattered light channel is used to monitor the ingress of foreign matter, the transmitted light channel is used for internal system monitoring and for adaptation to the fluctuating transparency of the condensate to be monitored. The sensitivity of this system starts at 2 ppm .
application
Oil and turbidity detectors should be easy to use and install. It should be possible to clean the glass cylinder without dismantling. They must have a high switching point accuracy and have an insensitive optoelectronic measuring principle. TÜV approval in accordance with VdTÜV information sheet water monitoring 100 is required. This makes their preferred areas of application:
- Condensate monitoring
- Turbine oil cooling in open circuits
- Filter monitoring
literature
- Association of German Engineers: Marine Technology, Volume 10 , VDI-Verlag
- Oil and turbidity detector, operating manual, GESTRA AG Bremen
- Fritz Mayr: Kesselbetriebstechnik , TÜV Bayern, Authors' Association, Graefelfing / Munich: Resch-Verlag 1980