Analisis Termal High Pressure Feed Water Heater Di PLTU PT. Ipmomi Unit 7 Dan 8 Paiton

PT. International Power Mitsui Operation and Maintenance Indonesia (PT. IPMOMI) mengoperasikan tiga unit Pembangkit Listrik Tenaga Uap (PLTU) unit 3, 7 dan 8 berkapasitas 2.030 MegaWatt. Pada PLTU Paiton unit 7 dan 8 terdapat delapan buah feedwater heater yaitu empat buah Low Pressure Water Heater (LPWH), tiga buah High Pressure Water Heater (HPWH), dan sebuah dearator. Pada PLTU Paiton unit 7 dan 8 terdapat kerusakan pada HPWH 6 yang menyebabkan penurunan efisiensi dari siklus secara keseluruhan. Penurunan efisiensi dapat terjadi karena temperatur feedwater sebelum masuk ke boiler terlalu rendah, sehingga kalor yang dibutuhkan oleh boiler untuk memanaskan feedwater meningkat. Oleh karena itu konsumsi batubara akan meningkat dan menyebabkan terjadi kenaikan biaya operasional harian dalam sistem pembangkit. Dari data Divisi Produksi PT. IPMOMI Unit 7 dan 8 diperoleh spesifikasi HPWH 6, 7, dan 8 dan propertis fluida dalam HPWH 6, 7, dan 8. Data tersebut digunakan sebagai dasar analisis termal yang meliputi performa masing-masing HPH. Tahap selanjutnya dalam analisis termal adalah memvariasikan beban 25%, 50%, 75%, 100%, dan 105%. Tahap terakhir analisis adalah menghitung performa dengan variasi sumbatan (plug) 5%, 10%, 15%, dan 20% sesuai dengan variasi beban. ======================================================================================================= PT. International Power Mitsui Operation and Maintenance Indonesia (PT. IPMOMI) operates three units of Steam Power (power plant) units 3, 7 and 8 with a capacity of 2,030 megawatts. At Paiton unit 7 and 8, there are eight feedwater heaters that four of Low Pressure Water Heater (LPH), three High Pressure Water Heater (HPH), and a dearator. At Paiton unit 7 and 8 there is damage to the HPH 6 which causes a decreasing of the efficiency of the overall cycle. The decreasing of the efficiency can occur because the temperature of the feedwater before it enters the boiler is too low, so the heat that be required by the boiler to heat the feedwater increased. Therefore, coal consumption will increase and lead an increasing of daily operating expenses in the generating system. From Production Division Data of PT. IPMOMI Unit 7 and 8, it might be known specification of HPH 6, 7, and 8 and fluid properties in HPH 6, 7, and 8. Those data were used for thermal analysis which covered performance of each HPH. The next step of thermal analysis was to vary load 25%, 50%, 75%, 100%, and 105%. The last step of analysis was to calculate the performance based on plug variations 5%, 10%, 15%, dan 20% corresponding to load variations