Laporan Magang PT Kilang Pertamina International Refinery Unit IV

Firmansyah, Muhammad Savril (2025) Laporan Magang PT Kilang Pertamina International Refinery Unit IV. Project Report. [n.a.]. (Unpublished)

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Abstract

Sulfur Recovery Unit (SRU) pada Unit 93 PT Kilang Pertamina Internasional (KPI) RU IV Cilacap berfungsi mengonversi gas H₂S hasil regenerasi amina menjadi sulfur cair melalui proses modified Claus, dengan Reaction Furnace 93-F-402 sebagai tahapan kritis (thermal stage) yang menentukan yield sulfur secara keseluruhan. Laporan kerja praktik ini bertujuan mengevaluasi performa Reaction Furnace 93-F-402 serta menganalisis pengaruh rasio combustion air terhadap acid gas feed dan temperatur furnace terhadap efektivitas proses thermal stage. Evaluasi dilakukan melalui troubleshooting variasi supply udara menggunakan simulasi proses Aspen HYSYS dengan paket SulSim, dilengkapi perhitungan neraca massa dan energi manual, yang kemudian dibandingkan dengan data operasi aktual di Unit 93. Hasil analisis menunjukkan bahwa kondisi operasi furnace saat ini berada pada kondisi under-oxidized, ditandai rasio H₂S/SO₂ outlet furnace di atas 2, jauh dari rentang optimal 1,6–1,7 yang diperlukan untuk mencapai driving force reaksi Claus yang maksimal pada tahap katalitik. Simulasi variasi rasio udara terhadap acid gas menunjukkan nilai optimal berbeda untuk tiap komposisi feed, yaitu 1,43 (70% H₂S), 1,50 (78% H₂S), dan 1,63 (86% H₂S), dengan kenaikan temperatur furnace yang dihasilkan masih berada di bawah batas aman 1300°C. Penerapan rasio udara optimal ini berpotensi meningkatkan konversi sulfur, efisiensi sulfur recovery, dan yield sulfur overall tanpa menimbulkan risiko over-oxidation maupun kerusakan material refractory. Berdasarkan temuan tersebut, direkomendasikan perubahan filosofi kontrol operasi furnace dari basis temperatur menjadi basis rasio H₂S/SO₂ secara real-time menggunakan Online Air Demand Analyzer (ADA), dikombinasikan dengan skema kontrol feedforward-feedback dan sistem peringatan dini terhadap lonjakan H₂S dari unit hulu.
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The Sulfur Recovery Unit (SRU) at Unit 93 of PT Kilang Pertamina Internasional (KPI) RU IV Cilacap converts H₂S gas produced during amine regeneration into liquid sulfur through the modified Claus process, with Reaction Furnace 93-F-402 serving as the critical stage (thermal stage) that determines the overall sulfur yield. This internship report aims to evaluate the performance of Reaction Furnace 93-F-402 and analyze the effects of the combustion air ratio on the acid gas feed and furnace temperature on the effectiveness of the thermal stage process. The evaluation was conducted by troubleshooting variations in air supply using Aspen HYSYS process simulation with the SulSim package, supplemented by manual mass and energy balance calculations, which were then compared with actual operating data from Unit 93. The analysis results indicate that the current furnace operating conditions are under-oxidized, as indicated by an outlet furnace H₂S/SO₂ ratio above 2, far from the optimal range of 1.6–1.7 required to achieve the maximum driving force for the Claus reaction in the catalytic stage. Simulations of variations in the air-to-acid gas ratio show different optimal values for each feed composition, namely 1.43 (70% H₂S), 1.50 (78% H₂S), and 1.63 (86% H₂S), with the resulting increase in furnace temperature remaining below the safe limit of 1300°C. Applying these optimal air-to-acid gas ratios has the potential to improve sulfur conversion, sulfur recovery efficiency, and overall sulfur yield without posing a risk of over-oxidation or damage to refractory materials. Based on these findings, it is recommended to shift the furnace operation control philosophy from a temperature-based approach to a real-time H₂S/SO₂ ratio-based approach using an Online Air Demand Analyzer (ADA), combined with a feedforward-feedback control scheme and an early warning system for H₂S spikes from upstream units.

Item Type:	Monograph (Project Report)
Subjects:	T Technology > TD Environmental technology. Sanitary engineering > TD899 Waste control in special industries, plants, processes, etc
Divisions:	Faculty of Vocational > 24305-Industrial Chemical Engineering
Depositing User:	Muhammad Savril Firmansyah
Date Deposited:	29 Jul 2026 03:10
Last Modified:	29 Jul 2026 03:10
URI:	http://repository.its.ac.id/id/eprint/137691

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