Kurniawan, Novandion Rafly (2023) Pemodelan Fouling Heat Exchanger pada Crude Preheat Train berdasarkan Persamaan Threshold Fouling dan Sigmoidal-Boltzmann. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pencegahan fouling pada crude heat exchanger menjadi perhatian dalam operasional heat exchanger khususnya dalam proses refinery. Beberapa model semi-empiris dan konsep threshold diusulkan untuk memprediksi fouling. Seluruh model pada dasarnya memiliki karakter kurva fouling linier, namun investigasi lebih lanjut ditemukan bahwa fungsi persamaan Sigmoidal lebih mencocoki dinamika resistansi fouling. Sehingga penelitian ini berusaha untuk
memodelkan fouling berdasarkan formulasi Sigmoidal-Boltzmann dan model semi-empiris threshold. Hasil pemodelan didapat sebagai fungsi Reynold number dan temperatur film dengan empat parameter fitting yang bersesuaian dengan masing-masing parameter SigmoidalBoltzmann. Model diujikan dalam sebelas heat exchanger dengan besar energi aktivasi 18 kJ/mol dan representatif terhadap temperatur film crude dalam rentang 39 – 232℃. Model usulan lebih unggul daripada model-model sebelumnya, dengan nilai R 2 tertinggi sebesar 98,44% pada HE-09 dan terendah sebesar 74,62% pada HE-01, sedangkan model-model sebelumnya hanya mencapai R 2 tertinggi sebesar 97,61% pada HE-09 dan terendah sebesar 7,55% pada HE-07. Karakteristik fouling linier muncul pada HE-06 dan HE-11; tren exponensial muncul pada HE-01, HE-02, dan HE-09; sedangkan tren sigmoid muncul pada HE03, HE-04, HE-05, HE-07, HE-08, dan HE-10. Hasil analisis PLS menunjukkan Re dominan kuat terhadap fouling secara negatif daripada Tf, sedangkan parameter konstanta yang memengaruhi fouling adalah a, b, dan k berturut-turut dari yang paling dominan, masingmasing secara positif.
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Fouling mitigation in crude preheat train has been a concern within heat exchanger operational in refinery process. Several semi-empirical model and thresholding concept has been proposed with the aim to predict the fouling. Basically, all of models has linear fouling curve characteristics, but recent investigation shows that Sigmoidal function tend to be suited with dynamics of fouling resistance. Then, this research try to model fouing based on Sigmoidal-Boltzmann formulation and threshold semi-empirical model. The results show the model as function of Reynold number and temperature film with four fitting parameters related to each of Sigmoidal-Boltzmann parameters. Model has been validated by eleven heat exchanger with activation energy value is 18 kJ/mol and representative toward crude film temperature within 39 – 232℃. Proposed model is superior that previous models with highest R 2 value is on HE-09 reach about 98,44% and the lowest is on HE-01 about 74,62%, while previous model only reach highest R 2 value on HE-09 about 97,61% and the lowest is on HE07 about 7,55%. Linear fouling classification appears in HE-06 and HE-11, exponential trend appears in HE-01, HE-02, and HE-09; and sigmoidal trend appears in HE-03, HE-04, HE-05, HE-07, HE-08, dan HE-10. Analysis result of PLS shows that Re more highly negative correlated to fouling rather than Tf, while contant parameter that affect fouling is a, b, dan k respectively from higher to lower dominance positively
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Fouling, Heat Exchanger, Model |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ263 Heat exchangers |
| Divisions: | Faculty of Industrial Technology > Physics Engineering > 30201-(S1) Undergraduate Thesis |
| Depositing User: | Novandion Rafly Kurniawan |
| Date Deposited: | 31 Jul 2023 01:17 |
| Last Modified: | 31 Jul 2023 01:17 |
| URI: | http://repository.its.ac.id/id/eprint/101330 |
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