Identification of induce draft fan damage using fault tree analysis
Keywords:
Fan damage, Induced draft fan, Fault tree analysisAbstract
Steam Power Plants (PLTU) are a type of generator that is widely used by the State Electricity Company (PLN) to meet national electricity needs, the hope of which is to reduce dependence on Diesel Power Plants (PLTD) PT. generating unit. The coal-fired Alamraya Semesta Energy with an installed capacity of 1x15 MW and a production target of 10 MW for utilities and 5 MW for wood processing has an Availability Hour of 82.9% and Unavailability of 17.1% during the period January to December 2013. Unavailability of 17.1% occurred either due to disturbances, inspection and repair of generating unit systems. Based on field findings, the outage occurred due to damage to the brush generator which had been discontinued, requiring fabrication and causing downtime of 32 days and repetitive failure in the IDF (Induced Draft Fan) which was used by the generator maintenance team to remove bottom ash. To determine action to improve the performance of the generating unit, an analysis is carried out of the main causes of IDF damage, as well as the financial losses that arise. Fault tree analysis shows that abrasion and perforation on fan blades and cones, as well as damage to motor bearings automatically reduce IDF efficiency.
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