Re-design High Pressure Heater (HPH) 4 PT. PJB UP Gresik menggunakan analisa termodinamika dan perpindahan panas

Budhiyanto, Akbar (2015) Re-design High Pressure Heater (HPH) 4 PT. PJB UP Gresik menggunakan analisa termodinamika dan perpindahan panas. Diploma thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Dalam memenuhi kebutuhan tenaga listrik di Jawa - Bali, PT. PJB UP Gresik menggunakan Siklus Rankine- Regenerative untuk meningkatkan efisiensi siklus PLTU, yaitu dengan menambahkan feedwater heater sebelum boiler. Akan tetapi sering terjadi kerusakan pada feedwater heater, salah satunya High Pressure Heater (HPH) 4. Kerusakan yang sering terjadi pada HPH 4 adalah kebocoran tube dan keausan baffle. Kerusakan pada HPH 4 terus menerus berulang dapat mengurangi umur, efektifitas dan performa dari HPH serta mengurangi efisiensi siklus PLTU. Oleh karena itu dilakukan re-design HPH 4 untuk mendapatkan dimensi baru HPH 4, khususnya zona desuperheating. Pada perancangan HPH 4 digunakan analisa termodinamika dan perpindahan panas dengan metode LMTD untuk mendapatkan dimesi tiap zona. Dalam perancangan, divariasikan kecepatan feedwater dan jumlah baffle pada zona desuperheating. Dari perhitungan yang dilakukan, didapatkan dimensi HPH 4 dengan effective length 12,36 m, diameter dalam shell 0,4 m dengan jumlah tube sebanyak 598 buah. Selain itu didapatkan dimensi zona desuperheating dengan panjang zona 1,54 m dengan baffle spacing sebesar 0,25 m, jumlah baffle 5 buah dan luasan perpindahan panasnya sebesar 46,33 m2. Batas plugging yang diijinkan adalah sebesar 10%, jika melebihi 10% plugging akan terjadi vibrasi. ============================================================================================ PT. PJB UP. Gresik using Rankine-Regenerative Cycle for increasing PLTU cycle efficiency. The efficiency is the result of adding feedwater heater before boiler device. However, defectiveness over feedwater heater frequently happened, such as High Pressure Heater (HPH) 4 for tube leakage and baffles worn-out. Defectiveness on HPH 4 continually could reduce its life span, effectiveness and performance, regarding PLTU. The HPH defectiveness could also decreasing PLTU cycle efficiency. Therefore, HPH 4 re-designing is needed to gain a new HPH 4 dimension especially for desuperheating zone. Thermodynamics and heat transfer analysis using LMTD method to design HPH 4 to gain each zone’s dimension. Variant of feedwater speed and number of baffles on desuperheating zone was used for designing HPH 4. Result calculation show that HPH dimension has effective length 12,36 m, diameter in shell units 0,4 m and the number of tube in use 598 tubes. Moreover, for desuperheating zone dimension was obtained zone length of 1,54 m, baffles spacing 0,25 m, number of baffles 5 and the heat transfer area 46,33 m2. Plugging point allowed was 10%, if it’s above 10% plugging would allow vibration.

Item Type: Thesis (Diploma)
Additional Information: RSM 621.402 5 Bud r
Uncontrolled Keywords: High Pressure Heater; Desuperheating zone; LMTD; Re-Design Heat Exchanger; Close Feedwater Heater
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ263 Heat exchangers
Divisions: Faculty of Industrial Technology > Mechanical Engineering > 21401-(D3) Diploma 3
Depositing User: - Taufiq Rahmanu
Date Deposited: 04 Oct 2019 07:35
Last Modified: 04 Oct 2019 07:35
URI: http://repository.its.ac.id/id/eprint/70998

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