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Indra Perdana
Departemen Teknik Kimia, Fakultas Teknik, Universitas Gadjah Mada Jl Grafika No. 2 Kampus UGM, Yogyakarta, 55281
Chemical Engineering, Chemistry & Bioengineering

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Model dispersi gas dan vapor cloud explosion pada kebocoran outlet pigtail tubes primary reformer Perwitasari Perwitasari; P. Sumardi; Indra Perdana
Jurnal Rekayasa Proses Vol 12 No 1 (2018): Volume 12, Number 1, 2018
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.33802

Abstract

Outlet pigtail tubes, one of the components in primary reformer, have a function to carry the reformed gas from the catalyst tubes to the collection manifold. Moreover, it also has a function to provide the required flexibility within the system to avoid overstress at the end of connections of the pigtail to the manifold and to the bottom of the catalyst tube. It operates in an extreme condition with temperature range of 825-850 oC and pressure 36.2 kg/cm2 which is possible to initiate a failure. The consequences of outlet pigtail tubes failure are a dispersion of synthesis gas and vapor cloud explosion. This research aimed to make a model of those consequences with an assumption that the leakage hole was the same as the diameter of outlet pigtail tubes. The gas dispersion model used in this research was dense gas dispersion continuous release model. The results showed that the highest ratio of synthesis gas-air concentration was 0.1 at 17.4 m distance from leaking point. Whereas the lowest ratio of synthesis gas-air concentration was 0.002 at 163.4 m distance from leaking point. The highest ratio of the concentration of gas dispersion gave vapor cloud explosion energy of about 11.67 x 105 kJ with an overpressure of about 8.41 kPa. The overpressure caused a partial demolition of the building (for example control room), panels blow in, and fastening fails of equipment or machines around the area.
Studi kinetika proses atmospheric pressure acid leaching bijih laterit limonit menggunakan larutan asam nitrat konsentrasi rendah Kevin Cleary Wanta; Felisha Hapsari Tanujaya; Ratna Frida Susanti; Himawan Tri Bayu Murti Petrus; Indra Perdana; Widi Astuti
Jurnal Rekayasa Proses Vol 12 No 2 (2018): Volume 12, Number 2, 2018
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.35644

Abstract

Kinetics study of atmospheric pressure acid leaching (APAL) process is indispensable for extractor design in an industrial scale. So far, the kinetic model used for this process is the shrinking core model. In this study, the shrinking core model was evaluated against experimental data for laterite leaching process using a solution of low concentration nitric acid (0.1 M). Variations in temperature and particle size were carried out at 303–358 K and <75–250 microns. Other operating conditions, such as pulp density, stirring speed, and time were kept at 20% w/v, 200 rpm, and 120 minutes, respectively. The model evaluation results showed that the shrinking core model was not suitable for this process because the process controlling stage is not just one stage only.
Co-Authors Felisha Hapsari Tanujaya Himawan Tri Bayu Murti Petrus Kevin Cleary Wanta P. Sumardi Perwitasari Perwitasari Ratna Frida Susanti Widi Astuti