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All Journal Jurnal Penelitian dan Pengembangan Pendidikan Rekayasa Mesin ROTOR: JURNAL ILMIAH TEKNIK MESIN Journal of Energy, Mechanical, Material and Manufacturing Engineering Prosiding Seminar Nasional Teknik Mesin
Widya Wijayanti
Department of Conservative Dentistry, Faculty of Dentistry, Universitas Indonesia, Jakarta 10430
Aerospace Engineering Automotive Engineering Control & Systems Engineering Education Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Efek Zeolit untuk Produksi Tar dan Char pada Pirolisis Rotary Kiln Wijayanti, Widya
Jurnal Rekayasa Mesin Vol 12, No 1 (2021)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2021.012.01.6

Abstract

This study aims to investigate the effect of zeolite as a catalyst to enlarge biomass decomposition in the pyrolysis process. It absorbs a high water content in the biomass, besides it makes the easier breaking of biomass molecules to maximize the biomass decomposition into the expected pyrolysis products; tar and char. In addition, to decompose the biomass molecules, the zeolite also stimulates the rate of heat transfer due to its ability to hold and release the heat. If the previous research pyrolysis was conducted in a fixed bed reactor, in this study, it will be carried out rotary kiln as a pyrolysis furnace. If the fixed bed reactor the heat transfer was dominated by conduction, the heat transfer in the rotary kiln is more controlled by the convection and radiation transfer due to stirring and turning of biomass by the kiln. In the study, the biomass used was mahogany with an initial weight of 150 grams. The rotary kiln rotated at 10 rpm and the heating rate during the pyrolysis process was around 0.1483°C/s. The pyrolysis temperatures used were varied as 250°C, 350°C, 450°C. Meanwhile, the percentage of zeolites used from 0% to 60% with a mesh size of 80. The results showed that zeolites were able to increase tar production and maximize the reduction of char as an effect of the Bronsted-Lowry and Lewis reaction in the process of catalytic cracking. The maximum production of tar and char production was also supported by the process of convection and radiation from the rotary kiln wall increasing the rate of heat transfer to decompose the biomass. 
Efek Bentonit pada Karakteristik Pembakaran Droplet Biodiesel Kelapa Sawit Wijayanto, Vera Dwi; Hamidi, Nurkholis; Wijayanti, Widya
Jurnal Rekayasa Mesin Vol 11, No 3 (2020)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2020.011.03.4

Abstract

The blends of fuel to base liquid fuels for the enhancement of combustion properties has long generated interest since it is linked to improvement in combustion properties in biodiesel fuels. This work investigates the effect of bentonite nanoparticles on the combustion characteristics of palm oil biodiesel. These nanoparticles are added in various compositions on biodiesel which are 0% (B0), 10% (B10), 20% (B20) and 30% (B30). The insulin pen was used to make Sub-millimeter-sized spherical droplets, and the combustion process of droplets was recorded using a camera in atmosphere condition. The fuel was dripped on the tip of the thermocouple junction and ignited using a torch of the butane-air mixture on a cylindrical burner. Properties such as ignition delay, burning rate, and flame temperature of droplets were measured with post-processing of the resulting images. The results showed a decrease in ignition delay and an increase of flame temperature with the increase of bentonite percentage due to bentonite acts as a catalyst capable of accelerating the reaction rate. However, the burning rate decrease with the increasing of bentonite percentage due to the oxygen content of the mixture is getting lower.
Co-Authors A.A. Ketut Agung Cahyawan W Andi Nugroho, Andi Christia Meidiana Denny Widhiyanuriyawan Dody Candra Kumara, Dody Candra Eko Siswanto Farid Majedi, Farid Ikhwanul Qiram Kusumastuti, Rizky Lilis Yuliati Mega Nur Sasongko Musyaroh, Musyaroh Nurkholis Hamidi Nuryosuwito, Nuryosuwito Purbo Suwandono Rahmad, Hadi Razi, Misru Razi, Misru Rizaldy, Ahmad Difal Sasmoko, Sasmoko Stefanus Christian Relmasira Sudjito Soeparman Tseng, Chung-Jen Wardana, I. N. G. Wardoyo Wardoyo Widodo, Agung S. Wijayanto, Vera Dwi