On-Line Steam Quality Monitoring, Applications, Experience and Innovations in the Southern Negros Geothermal Production Field, Philippines

Abstract

The first on-line steam quality monitoring set-up was developed in the Southern Nepos Geothernial Project (SNGP) in I991 in the Palinpinon-I 112.5 W e power plant. The current system reported in this paper, developed in 1996, and is also now operational in the llTanrji 1x20 W e and Sogongon-I/IJ 2x20 M W e modular power plants, is a sigmjcant improvement of the orignal set-up.

The Na concentraifion readout signal fiom the flame photometer is transmitted to a transducer, and directly recorded and diqlapd in a strip chart recorder and digital indicator, respectively, in the control room panel. ?%e system is calibrated and equipped with an alarm system at a pre-set Ab concentration. This improvement enables an in-situ, 21 hours monitoring capability which provides real time steam quality data. power plant engineers will thus be able to timely respond to any upset in the Fluid Collection and Drsposal System (FCD$) that will affea steam quality. The performance of this syslem has been tested under normal and abnormal steam punty conditions (Le. during a system upset in the Sogongon-I modular plant last July 1997), in which an adequate respovrse was demonstrated and proven.