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All Journal Jurnal Surya Teknika Journal of Bioprocess Chemical and Environmental Engineering Science
Luthfi, Alif
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Decision Sciences, Operations Research & Management Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Techno-Economic Analysis of DME Production from Indonesian Brown Coal: A Preliminary Plant Design Luthfi, Alif; Nugraha, Mohd Farhan; Ramadhani, Shafira Rachma; Legawati, Lisa; Yolanda, Yogi; Maarasyid, Cici; Zulfansyah, Zulfansyah
JURNAL SURYA TEKNIKA Vol. 12 No. 1 (2025): JURNAL SURYA TEKNIKA
Publisher : Fakultas Teknik UMRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37859/jst.v12i1.9331

Abstract

This article presents the preliminary plant design and techno-economic assesment of Dimethyl Ether (DME) production from coal. As the world’s third largest coal producer, Indonesia faces challenges in using low rank lignite due to its high moisture content, wgich limits direct combustion efficiency. The plant was designed to produce 210,000 tons of DME per year, supporting national effort to reduce LPG imports and improve energy security. The calculation include mass and energy balances, equipment sizing, and enviromental considerations suh as CO2 emissions management. Economic evaluation demonstrate project feasibility, with an internal rate of return of 24.28%, a payback period of 3.46 years, and a net present value of 39.60 million USD. Sensitivity analysis shows profitability is highly sensitive to DME price variations. Further research issyngas recommended to develop effective carbon capture strategies and evaluate lifecycle emissions to enhance DME production more enviromentally friendly and sustainable.
Evaluasi Performa Heat Exchanger Menggunakan Software Aspen HYSYS di Central Gathering Station "X" Plant Operations "Y" Pertamina Hulu Rokan Helianty, Sri; Luthfi, Alif; Wijaya, Deni
Journal of Bioprocess, Chemical and Environmental Engineering Science Vol 6 No 1 (2025): Journal of Bioprocess, Chemical, and Environmental Engineering
Publisher : Department of Chemical Engineering, Faculty of Engineering, UNRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jbchees.6.1.26-39

Abstract

The Rokan Block is one of Indonesia's largest oil producers. It is managed by PT Pertamina Hulu Rokan (PHR) and contributes 25% to Indonesia's total oil production. The Central Gathering Station (CGS) “X” at PT PHR utilizes shell and tube heat exchangers (HEX) to effectively heat produced fluids, thereby enhancing the separation of crude oil. Despite their utility, several challenges—such as uneven fluid distribution, fouling, and tube plugging—have compromised the performance of heat exchangers (HEX). These issues can result in some units failing to reach the desired temperature. This study assessed the performance of HEX at CGS X using Aspen HYSYS and Aspen Exchanger Design and Rating (EDR) software, concentrating on key parameters including the heat transfer coefficient, pressure drop, and fluid velocity. The analysis revealed that low fluid velocity within the shell increased the risk of fouling, and a fouling resistance exceeding 0.03 ℉·hr·ft²/Btu significantly diminished efficiency. To address this, a redesigned heat exchanger (HEX) was proposed to optimize fluid velocity, achieving a rate of 1.15 ft/s. This adjustment reduced fouling and enhanced heat transfer while maintaining economic feasibility by decreasing the required heat transfer area. Operational recommendations based on the performance evaluation included making appropriate fluid distribution adjustments and conducting timely maintenance to ensure reliable operation
Co-Authors Cici Maarasyid Lisa Legawati Nugraha, Mohd Farhan Ramadhani, Shafira Rachma Sri Helianty Wijaya, Deni Yolanda, Yogi Zulfansyah Zulfansyah