Wijanarko, Nadia Parwaty (2017) Re-Design High Pressure Heater (HPH) 5 Unit 1 Di PT. PJB UP Gresik Menggunakan Analisis Termodinamika dan Perpindahan Panas. Diploma thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pada PT. PJB UP. Gresik Unit 1 terdapat 5 feedwater heater, yaitu 2 low pressure heater (LPH), 2 high pressure heater (HPH), dan 1 deaerator. HPH yang ada di pembangkit ini yaitu HPH 4 dan HPH 5. Pada tugas akhir ini, heater yang akan di-re-design adalah HPH 5. HPH merupakan alat pemanas feedwater lanjut tekanan tinggi dengan menggunakan ekstraksi uap turbin sebagai media pemanasnya . Kerusakan yang sering terjadi pada HPH 5 adalah kebocoran tube dan keausan baffle. Kerusakan pada HPH 5 terus menerus berulang dapat mengurangi efektifitas dan performa dari HPH.
Re-design pada HPH 5 yaitu dengan melakukan analisis termodinamika terhadap HPH 5 sebagai control volume. Melakukan perhitungan perpindahan panas dengan metode LMTD untuk mendapatkan dimensi tiap zona. Perhitungan yang dilakukan yaitu menentukan panjang masing-masing tiap zona HPH, laju perpindahan panas, Overall Heat Transfer Coefficient (U), luas perpindahan panas (A), perhitungan pressure drop (P) pada tube dan pada shell (untuk masing-masing zona yaitu zona desuperheating, zona condensing, zona subcooling). Perhitungan pressure drop untuk mengetahui kerugian tekanan yang terjadi. Melakukan uji performa menggunakan metode NTU-. Selain itu, pada re-design ini akan dilakukan variasi terhadap kecepatan feedwater serta plugging.
Hasil dari perhitungan, didapatkan dimensi HPH 5 dengan panjang tube 9,614 m, jumlah tube sebanyak 531 buah dan diameter dalam shell yaitu 1 m. Selain itu, untuk zona desuperheating didapatkan panjang zonanya sebesar 0,851 m dengan jumlah baffle 3 buah. Pada zona condensing didapatkan panjang sebesar 7,864 m dengan jumlah baffle 4 buah. Pada zona subcooling didapatkan panjang sebesar 0,899 m dengan jumlah baffle 5 buah. Pressure drop sisi tube sebesar 0,33 kg/cm2.Pressure drop sisi shell sebesar 0,3344 kg/cm2. Batas plugging yang diijinkan adalah sebesar 10%, jika melebihi 10% plugging akan terjadi vibrasi.
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At PT. PJB UP Gresik Unit 1 there are 5 feedwater heaters, they are 2 low pressure heaters. (LPH), 2 high pressure heaters (HPH), and 1 deaerator. HPH in this plant is HPH 4 and HPH 5. In this final project, heater that will be re-design is HPH 5. HPH is a feedwater heater with high pressure which is using extraction of turbine steam as a heating medium. The common defectiveness over HPH 5 is tube leakage and baffles worn-out. Continually defectiveness on HPH 5 could reduce effectiveness and performance from HPH.
Re-design on HPH 5 is analyzed by thermodynamics on HPH 5 as a control volume.Calculating the heat transfer by LMTD method to get a dimension of each zone.The calculation is to determine the length of each HPH’s zone, heat transfer rate, Overall Heat Transfer Coefficient (U), heat transfer area (A), pressure drop calculation (P) for tube and shell (for each zone such as desuperheating zone, condensing zone, subcooling zone). Pressure drop calculation was also be done to discover pressure loss that could occur. Perform the performance test using NTU- method. Besides that, variant of feedwater speed and number of plugging was used for re-designing HPH 5.
The results from calculation, obtained dimension of HPH 5 with length of tube is 9.614 m, number of tubes are 531 and inner diameter of shell is 1 m. Moreover, at desuperheating zone, thelength of it was 0.851 m with 3 baffles. At condensing zone, the length was 7.864 m with 4 baffles. And at subcooling zone, the length was 0.899 m with 5 baffles. Pressure drop on tube side is 0,33 kg/cm2. Pressure drop on shell side is 0.3344 kg/cm2. Plugging point allowed is 10%, if it’s above 10% plugging would allow vibration.
| Item Type: | Thesis (Diploma) |
|---|---|
| Uncontrolled Keywords: | high pressure heater, re-design, LMTD, pressure drop, baffle, NTU-. |
| Subjects: | T Technology > TJ Mechanical engineering and machinery T Technology > TJ Mechanical engineering and machinery > TJ164 Power plants--Design and construction |
| Divisions: | Faculty of Vocational > Mechanical Industrial Engineering (D4) |
| Depositing User: | NADIA PARWATY WIJANARKO |
| Date Deposited: | 12 Dec 2017 04:14 |
| Last Modified: | 05 Mar 2019 06:50 |
| URI: | http://repository.its.ac.id/id/eprint/48153 |
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