DWIATNA, EKKY MEIDY (2020) ANALISIS KINERJA PADA HIGH PRESSURE HEATER 6 SEBELUM DAN SESUDAH KEGIATAN PEMELIHARAAN PERIODIK SERIOUS INSPECTION DI UNIT 5 PLTU SURALAYA BERDASARKAN KOEFISIEN PERPINDAHAN PANAS KESELURUHAN. S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
One way to improve efficiency in Steam Power Plants is to use a Feedwater Heater (Heat Exchanger). High Pressure Heater (HP Heater) is one type of Feed Water Heater (Heat Exchanger) that functions as a high pressure advanced filler water heater that uses hot steam from the extraction of the turbine as the heating medium before entering the economizer on the boiler. Non-operational high pressure heater (HP Heater) can cause losses, where the burden of performance of other equipment becomes large. Based on this background, the purpose of this study was to identify the decline in performance and the effect of periodic serious inspection activities on the performance of the HP heater based on the overall heat transfer coefficient method.. This performance analysis by calculating the heat transfer rate, broad field perpendicular to heat transfer, difference in average logarithmic temperature (LMTD), and equipment correction factors to find the overall heat transfer coefficient value on the HP heater. The results of these calculations obtained the value of the HP heater heat transfer coefficient design by 1089.76 W / m2. ° C and actually before serious inspection is 643 W / m2. ° C at peak load (full load), which indicates the actual condition of the HP heater has decreased performance by 39.89% from the initial design. Then the results of the actual calculation of the HP heater after serious inspection were 827.88 W / m2. ° C at peak load (full load). From these data the performance of the HP heater 6 unit 5 has increased the performance of the value before the serious inspection of 22.33%. Keywords: Heat transfer coefficient, Heat transfer area, Log mean temperature difference (LMTD), heat transfer rate, correction factor Salah satu cara untuk meningkatkan efisiensi pada Pembangkit Listrik Tenaga Uap adalah dengan menggunakan Feedwater Heater (Heat Exchanger). High Pressure Heater (HP Heater) merupakan salah satu jenis dari Feed Water Heater (Heat Exchanger) yang berfungsi sebagai pemanas air pengisi lanjut bertekanan tinggi yang menggunakan uap panas hasil ekstraksi turbin sebagai media pemanasnya sebelum masuk economizer pada boiler. Tidak beroperasinya high pressure heater (HP Heater) dapat menyebabkan kerugian, dimana beban kinerja peralatan lain menjadi besar. Berdasarkan latar belakang tersebut, tujuan dari penelitian ini untuk mengidentifikasi penurunan kinerja dan pengaruh kegiatan periodik serious inspection terhadap kinerja HP heater berdasarkan metode koefisien perpindahan panas keseluruhan. Analisa kinerja ini dengan melakukan perhitungan laju perpindahan panas, luas bidang tegak lurus terhadap perpindahan panas, selisih temperatur rata-rata logaritmik (LMTD), serta faktor koreksi peralatan guna mencari nilai koefisien perpindahan panas keseluruhan pada HP heater. Kesimpulan dari hasil perhitungan tersebut didapatkan nilai koefisien perpindahan panas HP heater secara desain sebesar 1089,76 W/ m2. °C dan secara aktual sebelum serious inspection sebesar 643 W/ m2. °C pada beban puncak (full load), yang menandakan kondisi aktual HP heater telah mengalami penurunan kinerja sebesar 39,89 % dari desain awal. Kemudian hasil perhitungan aktual HP heater setelah serious inspection didapat sebesar 827,88 W/ m2. °C pada beban puncak (full load). Dari data tersebut kinerja HP heater 6 unit 5 mengalami peningkatan kinerja dari nilai sebelum serious inspection sebesar 22,33 %. Kata kunci: Koefisiean perpindahan panas, Luas perpindahan panas, Log mean temperatur difference (LMTD), Laju perpindahan panas, Faktor koreksi
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