Analisis Kegagalan Retaining Plate pada CO Boiler Menggunakan Metode Elemen Hingga Akibat Beban Termal, Tekan, dan Korosi

Radhif'an, Barra Izzatur (2026) Analisis Kegagalan Retaining Plate pada CO Boiler Menggunakan Metode Elemen Hingga Akibat Beban Termal, Tekan, dan Korosi. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Retaining plate merupakan salah satu komponen penting pada expansion joint yang berfungsi menahan bolster untuk mengakomodasi termal ekspansi selama proses operasi pada temperatur tinggi. Kondisi operasi yang mencapai 1040°C serta paparan gas hasil pembakaran menyebabkan komponen ini rentan mengalami degradasi material, deformasi, dan kegagalan struktur. Penelitian ini bertujuan untuk menganalisis pengaruh temperatur operasi terhadap respons termomekanik retaining plate, mengkaji distribusi spesies gas pada lingkungan operasi CO Boiler, mengevaluasi mekanisme High Temperature Corrosion (HTC), serta menentukan material alternatif yang memiliki performa terbaik berdasarkan hasil simulasi. Penelitian dilakukan menggunakan perangkat lunak melalui pendekatan multiphysics yang menggabungkan modul Heat Transfer in Solids, Solid Mechanics, Transport of Diluted Species, dan Global ODEs and DAEs. Simulasi termomekanik dilakukan pada temperatur 20°C, 540°C, dan 1040°C menggunakan empat material, yaitu SA240 TP310, Haynes 230, Inconel 625, dan FP-Alumina/45 vol.% SiC. Analisis High Temperature Corrosion dilakukan pada material SA240 TP310 menggunakan model oksidasi parabolik berdasarkan pendekatan Arrhenius. Selanjutnya dilakukan evaluasi Safety Factor material logam berdasarkan ASME BPVC Section II Part D. Hasil penelitian menunjukkan bahwa peningkatan temperatur menyebabkan meningkatnya distribusi temperatur, tegangan termal, dan deformasi, serta menurunkan nilai Safety Factor. Simulasi HTC menunjukkan bahwa pertumbuhan lapisan oksida mengikuti kinetika parabolik sehingga laju korosi menurun seiring bertambahnya waktu akibat terbentuknya lapisan oksida pelindung. Berdasarkan evaluasi termomekanik dan Safety Factor, Haynes 230 menunjukkan performa terbaik sebagai material logam alternatif dengan nilai safety factor tertinggi pada seluruh temperatur pengujian. Sementara itu, FP-Alumina/45 vol.% SiC menghasilkan tegangan dan deformasi paling rendah, namun memerlukan kajian lebih lanjut terkait ketahanan fracture dan thermal shock sebelum dapat direkomendasikan sebagai material retaining plate.
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Retaining plates are critical components in a CO Boiler, serving to support the refractory lining under continuous high-temperature operating conditions. Exposure to temperatures reaching 1040°C, combined with combustion gases, can accelerate material degradation, thermal deformation, and structural failure. This study aims to investigate the influence of operating temperature on the thermomechanical behavior of the retaining plate, analyze the distribution of gaseous species within the CO Boiler environment, evaluate the High Temperature Corrosion (HTC) mechanism, and determine the most suitable alternative material based on numerical simulation results. The study was conducted using a multiphysics approach integrating the Heat Transfer in Solids, Solid Mechanics, Transport of Diluted Species, and Global ODEs and DAEs modules. Thermomechanical simulations were performed at operating temperatures of 20°C, 540°C, and 1040°C using four candidate materials: SA240 TP310, Haynes 230, Inconel 625, and FP-Alumina/45 vol.% SiC. High Temperature Corrosion analysis was carried out on SA240 TP310 using a parabolic oxidation model based on the Arrhenius equation. Furthermore, the structural integrity of the metallic materials was evaluated through Safety Factor calculations in accordance with ASME BPVC Section II Part D. The simulation results indicate that increasing operating temperature leads to higher temperature distribution, thermal stress, and total deformation while reducing the Safety Factor. The HTC simulation demonstrates that oxide scale growth follows a parabolic oxidation kinetics model, resulting in a gradual decrease in the corrosion rate as the protective oxide layer develops over time. Based on the thermomechanical evaluation and Safety Factor analysis, Haynes 230 exhibited the best overall performance among the metallic materials by providing the highest structural safety margin over the investigated temperature range. Meanwhile, FP-Alumina/45 vol.% SiC produced the lowest stress and deformation values; however, additional investigations on fracture toughness and thermal shock resistance are required before it can be recommended as an alternative retaining plate material.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	CO Boiler, High Temperature Corrosion, retaining plate
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA169.5 Failure analysis T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering)
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Barra Izzatur Radhi` fan
Date Deposited:	28 Sep 2026 03:01
Last Modified:	28 Sep 2026 03:01
URI:	http://repository.its.ac.id/id/eprint/144914

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