Planning an overhaul of the existing, non-operating Kapisya geothermal binary power plant (using perchloro-ethylene) after a prolonged dormancy period

Abstract

In Zambia, a small pilot geothermal Turboden binary power generating plant was constructed, but has remained non-operational for an extended period of time. The plant has been earmarked for reconditioning with a view to improving brine resources and up-rating the electro-mechanical equipment’s capacity. With resource evaluations in progress and the plant’s surface facility conditions assessed, the plant is set to be operational after equipment overhaul. This study examines the actual and potential overhaul requirements considering both non-operating and operating plant system states in a geothermal environment. The evaluation indicates that a condition-based equipment overhaul can be undertaken, incorporating potential equipment improvements in the system for enhanced performance. Baseline operating reliability maintenance strategy has been proposed by considering the Svartsengi Ormat binary plant standards in Iceland, operating experience and original equipment manufacturers’ recommendations. Making geothermal electrical energy as a preferred green energy source calls for an increase in exploration, drilling and plant construction expenses coupled with an effective reliability of plant maintenance and management.