Analisis Kinerja Ejektor PLPT X Menggunakan Metode Empiris dan Metode Numerik
One of the steam characteristics produced by from geothermal field is the presence of non condensable gases (NCGs) in the steam. The existence of NCGs in steam flow influences the pressure in the condenser.
Based on the data from geothermal field, there is a tendency of NCG ascension exceeding 0.70% in the near future. Gas removal system (GRS) of XGeothermal Power Plant is designed to handle maximum capacity of NCG 0.53% for each ejector. Meanwhile, NCG of X geothermal field has already exceeded 0.567%.
The capacity of GRS device in this plant will be evaluated by means of empirical and numerical method. Empirical method is used to calculate pressure outlet of ejector and the motive steam required. On the other side, numerical method is used to calculate the amount of motive steam and mass flow rate of NCG that extracted by ejector.It is clearly shown from the result of numerical method that the existing GRS device could not handle the NCG content above 0.53%. Therefore, it is recommended that new GRS with higher capacity should be used to overcome the increasing of NCG content.