ANALISA UNJUK KERJA BOILER FEED PUMP TURBIN UNIT 2 PLTU I JAWA TENGAH REMBANG ( ANALYSIS PERFORMANCE EFFICIENCY OF BOILER FEED PUMP TURBINE IN UNIT 2 PLTU 1 CENTRAL JAVA REMBANG )

Abstract

Boiler feed pump atau pompa pengumpan air demin boiler pada PLTU mempunyai peranan yang penting yaitu untuk mensirkulaskani air demin dari deaerator menuju steam drum boiler. Ketika dioperasikan selama 14 bulan, boiler feed pump terindikasi mengalami penurunan kinerja. Oleh karenanya, suatu evaluasi kinerja dilakukan untuk boiler feed pump tersebut. Metode evaluasi yang dilakukan diantaranya koleksi data operasional boiler feed pump pada tahun 2012 dan 2013. Kalkulasi efisiensi boiler feed pump, efisiensi sistem air umpan, dan heat rate boiler feed pump, serta kalkulasi harga steam penggerak mini-turbin untuk boiler feed pump turbin. Hasil kalkulasi data tahun 2012 dan 2013 diperbandingkan. Hasil perbandingan tersebut menunjukkan adanya penurunan. Penurunan efisiensi sebesar 7,44% , 7,2% pada BFPT A dan BFPT B, 12,71% dan 7,28% pada sistem air umpan ketika tidak menggunakan spray dan ketika menggunakan spray, penurunan heat rate BFPT sebesar 654,94 kJ/kwh. Biaya steam penggerak mini-turbin BFPT A mengalami kenaikan sebesar Rp273639 dan pada BFPT B Rp398236. Penurunan kinerja tersebut diduga disebabkan salah satunya meningkatnya kebutuhan air demin untuk spray (pendingan). Spray terjadi dikarenakan tingginya temperatur pada area superheter. Perlu adanya evaluasi dan overhaule untuk meningkatkan efisiensi, sehingga menghindari pemborosan batubara dan air demin. Kata kunci : Efisiensi, Boiler Feed Pump Turbin Boiler feed pump or pump water demin boiler feeders on PLTU has an important role to the circulation water demin of the deaerator to the steam drum boiler. When operated for 14 months, the boiler feed pump into alleged experience decreased performance. Therefore, a performance evaluation conducted for the boiler feed pump. Evaluation methods of data collection such as the boiler feed pump operational in 2012 and 2013. Calculation of efficiency of boiler feed pump, efficiency of feed water systems, boiler feed rate and heat pump, as well as price calculation steam turbine mini-movers for boiler feed pump turbine. Results of a calculation of data in 2012 and 2013 to be compared. The results of the comparison showed a decline. Decrease the efficiency of 7,44%, 7,2% at BFPT A and BFPT B, 12.71% and 7.28% on feedwater system when not using the spray and when using the spray, heat loss rate of BFPT 654,94 kJ/kwh. The cost of a steam locomotion mini-turbin BFPT A increased by Rp273639 and on BFPT B Rp398236. The decline in the performance was allegedly caused one of them is the increasing demand of water demin to spray ( cooling ). Spray occurred due to the high temperatures in the area superheter. The need of evaluation and overhaule to improve the efficiency, so avoidance of extravagance coal and water demin. Keywords: Efficiency, Boiler Feed Pump Turbine