Analisa Numerik Pengaruh Penambahan Turning Van Terhadap Karakteristik Aliran Dan Distribusi Temperatur Pada Heat Recovery Stem Generator (Hrsg)

Hakim, Winandra Fajar (2024) Analisa Numerik Pengaruh Penambahan Turning Van Terhadap Karakteristik Aliran Dan Distribusi Temperatur Pada Heat Recovery Stem Generator (Hrsg). Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

PLTGU Tanjung Uncang menjadi salah satu pembangkit di Indonesia yang menggunakan CCGT (Combined Cycle Gas Turbine). Pada HRSG tanjung uncang memiliki SOP yang mengatur gas buang turbin gas pada saat kondisi cold start harus pada temperature dibawah 400°C. Sedangkan, turbin gas PLTGU tanjung uncang memiliki base load 5 MW dengan temperatur 560°C - 580°C. Oleh karena itu, diperlukan asinkron untuk mencapai kondisi FSNL (Full Speed No Load) pada turbin gas dengan bukaan damper diatur sudut 51°, 68°, dan 90° selama 45 menit. Hal tersebut melatarbelakangi diperlukannya analisis numerik pengaruh penambahan turning vane terhadap karakteristik aliran dan distribusi temperatur pada Heat Recovery Steam Generator (HRSG). Analisis dilakukan dengan CFD (Computational fluid dynamics) dengan software ANSYS Fluent 2020. Variasi yang digunakan yaitu nilai sudut turning guide vane 36°,45°, 53°, dan 72° yang dikombinasikan dengan jumlah turning guide vane 2 dan 3. Output dari simulasi adalah kontur kecepatan, kontur temperatur, dan endurance limit pada superheater tube. Karaktersitik aliran dan distribusi temperatur yang terbaik didapatkan pada variasi sudut 53° dengan jumlah turning guide vane 2 dengan velocity terbesar 6.06 dan temperatur 580°C pada elevasi 9.27 m/s. Analisis menunjukkan bahwa pada laju aliran uap sebesar 0.0576 ton/h, temperatur dinding tabung dapat meningkat hingga 541.84°C, yang menyebabkan batas kekuatan material menurun secara signifikan menjadi 143.94 MPa. Laju aliran uap yang ideal adalah 2.7 ton/jam, yang mana batas kekuatan material tetap hampir sama dengan kondisi operasi saat ini (400°C). Penghematan dari penggunaan air demineralisasi mencapai Rp29,865,120 per hari.
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PLTGU Tanjung Uncang is one of the power plants in Indonesia that uses CCGT (Combined Cycle Gas Turbine). At HRSG Tanjung Uncang has an SOP that regulates the exhaust gas of the gas turbine at the time of cold start conditions must be at a temperature below 400°C. Meanwhile, the PLTGU tanjung uncang gas turbine has a base load of 5 MW with a temperature of 560°C - 580°C. Therefore, asynchrony is required to achieve FSNL (Full Speed No Load) conditions on the gas turbine with damper openings set at angles of 51°, 68°, and 90° for 45 minutes. This is the reason why numerical analysis of the effect of additional turning vane on the flow characteristics and temperature distribution in Heat Recovery Steam Generator (HRSG) is required. The analysis was conducted using CFD (Computational fluid dynamics) with ANSYS Fluent 2020 software. The variations used are the turning guide vane angle values of 36°, 45°, 53°, and 72° combined with the number of turning guide vane 2 and 3. The output of the simulation is the velocity contour, temperature contour, and endurance limit on the superheater tube. The best flow characteristics and temperature distribution were obtained at an angle variation of 53° with a number of turning guide vane 2 with the largest velocity of 6.06 and a temperature of 580°C at an elevation of 9.27 m/s. Analysis shows that at a steam flow rate of 0.0576 tonnes/h, the tube wall temperature can increase to 541.84°C, which causes the material strength limit to decrease significantly to 143.94 MPa. The ideal steam flow rate is 2.7 tonnes/hour, where the material strength limit remains almost the same as the current operating condition (400°C). Savings from the use of demineralised water reached Rp29,865,120 per day.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Heat Recovery Steam Generatore, Superheater, Turning Vane, Full Spead No load
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ164 Power plants--Design and construction T Technology > TJ Mechanical engineering and machinery > TJ263 Heat exchangers T Technology > TJ Mechanical engineering and machinery > TJ265.E23 Thermodynamics.
Divisions:	Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Winandra Fajar Al Hakim
Date Deposited:	09 Aug 2024 06:09
Last Modified:	09 Aug 2024 06:09
URI:	http://repository.its.ac.id/id/eprint/113554

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