Re-Design Lube Oil Cooler Jenis Plate Heat Exchanger Pada Turbin Uap (Studi Kasus PT. PJB Muara Karang)

Aritonang, Nikolas Padan (2022) Re-Design Lube Oil Cooler Jenis Plate Heat Exchanger Pada Turbin Uap (Studi Kasus PT. PJB Muara Karang). Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Sistem pembangkit tenaga gas dan uap merupakan sebuah sistem yang memiliki pergerakan atau perputaran yang tinggi. Dalam pergerakannya, tentu terjadi banyak gesekan, oleh karena itu, peranan pelumas menjadi sangat krusial dalam menjaga performa pembangkit tetap optimal. Tidak hanya itu, suhu dari pelumas yang digunakan juga tidak kalah penting dari pelumasan itu sendiri, dikarenakan apabila suhu oli pelumas terlalu tinggi, pelumasan tidak dapat dilakukan secara maksumal,oleh karena itu, diperlukan adanya lube oil cooler. Lube oil cooler merupakan heat exchanger, pada penelitian ini bertipe plate heat exchanger U-arrangement, single pass, yang digunakan untuk mendinginkan lube oil yang bekerja pada pendingin, fluida pendingin yang digunakan berjenis make up water. Saat oil cooler beroperasional, didapati bahwa perubahan suhu (delta t) pendinginan dari lube oil masih dibawah dari yang seharusnya, hal ini dapat menyebabkan pembangkit tidak bekerja pada kondisi optimal, dan bahkan dapat menyebabkan shutdown. Oleh karena itu, diperlukan analisa pada kondisi pendinginan lube oil yang telah ada, dan dilakukan redesign pada lube oil cooler tersebut, untuk meningkatkan efektivitas. Penelitian ini meliputi analisa dari lube oil cooler existing dan juga redesign lube oil cooler. Pada analisa ditelaah perpindahan panas aktual dan juga efektivitas. Sementara redesign dilakukan dengan mem-variasikan mass flow rate dari fluida pendingin, dan juga divariasikan sudut chevron untuk plate heat exchanger U-arrangement, single pass, dengan Batasan yang ada adalah volume dari plate dan heat exchanger. Perancangan ini menggunakan metode log mean temperatur difference dan juga NTU. Setelah dilakukan penelitian, didapati bahwa berdasarkan batasan-batasan yang telah ditentukan, maka dari perhitungan dipilih hasil redesign yang sesuai yaitu dengan chevron angle 30 derajat, dan laju aliran massa water 22.301 kg/s, dimana dengan chevron angle 30 derajat dan, laju aliran massa water 22.301 kg/s, perforna yang didapatkan adalah heat transfer actual 631105.29 watt, temperatur keluar oli 310.42 K, effectiveness 89%, NTU 2.82. Dan untuk mengembalikan performa heat exchanger pada kondisi desain, digunakan desain Dengan chevron angle 30 derajat, dan laju aliran massa water 18.301 kg/s.
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Combined cycle powerplant is categorized as a system that has a high movement ratio, during that cycle, it is expected that a lot of friction occurs in the moving parts of the turbine, hence, lubrication system is very important in a combined cycle power plant to keep it performing optimally. Not only lubrication system that’s important. But the temperatur of the lubricant has a important part during this cycle. Because when the temperatur of the lubricant is high, the lubrication cycle cannot be maximally performed. Hence why we needed a lube oil cooler. Lube oil cooler is an heat exchanger device, in this research, we focuses on a plate heat exchanger U-arrangement, single pass, that being used to cool the lubrication oil thet works on a turbine, and the coolant used in this oil cooler is make up water, during its work. We noticed that the difference between the oil temperatur inlet and outlet (delta t) is not far enough, this can has an effect to the turbine, it can cause the turbine not working at the optimal condition, or even cause a shutdown. That’s a performance analysis needed to be performed, as with redesigning the lube oil cooler. This research consist of performance analysis for the current lube oil cooler, in the analysis, the effectiveness and actual heat transfer is being analysed. As for the redesign is done with variation of the cold fluid mass flow rate, also the chevron angle for plate heat exchanger U�arrangement, single pass is being varied. The scope of problem in this study is the volume of the heat exchanger. The redesigning uses a log mean temperatur difference and also NTU method. After the research was done, the result is concluded, that with the boundary set at the beginning of the research, the best design suited for the purpose is chevron angle 30 degrees, and mass flow rate 22.301 kg/s, the research concluded that with this combination, the peak performance of the heat exchanger is obtained, such as; heat transfer actual 631105.29 watt, outlet temperatur of hot fluid 310.42 K, effectiveness 89% and NTU 2.82. But, to restore the heat exchanger performance to it’s initial state on a design condition, the design that’s appropriate are chevron angle 30 degree, and mass flow rate 18,301 kg/s.

Item Type:	Thesis (Other)
Additional Information:	RSM 621.165 Ari r-1 2022
Uncontrolled Keywords:	Lube Oil Cooler, Plate Heat Exchanger, U-arrangement, single pass, LMTD, NTU, Overall Heat Transfer Coefficient, Effectiveness.
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ778 Gas turbines
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Mr. Marsudiyana -
Date Deposited:	20 Feb 2025 05:55
Last Modified:	20 Feb 2025 05:55
URI:	http://repository.its.ac.id/id/eprint/118824

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