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All Journal Jurnal Penelitian dan Pengembangan Pendidikan Rekayasa Mesin Journal of Engineering and Management in Industrial System ROTOR: JURNAL ILMIAH TEKNIK MESIN Journal of Energy, Mechanical, Material and Manufacturing Engineering Prosiding Seminar Nasional Teknik Mesin International Journal of Mechanical Engineering Technologies and Applications (MECHTA) Asean Journal of Science and Engineering (AJSE) Prosiding SNPBS (Seminar Nasional Pendidikan Biologi dan Saintek) Prosiding SEMNAS INOTEK (Seminar Nasional Inovasi Teknologi) Jurnal Polimesin
Widya Wijayanti
Department of Conservative Dentistry, Faculty of Dentistry, Universitas Indonesia, Jakarta 10430
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Transportation

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The effect of biomass ratio and CaO/Si catalyst on hydrogen production from corncob–wood pellet gasification Suwandono, Purbo; Wijayanti, Widya; Ismail, Nova Risdiyanto; Akbar, Dzulfikar Johan; Pambudi, Wisnu Setyo Catur
Jurnal Polimesin Vol 23, No 6 (2025): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i6.7803

Abstract

Biomass co-gasification combined with catalytic upgrading offers a promising pathway for enhancing hydrogen-rich syngas production. This study investigates co-gasification of corncob and wood pellets in an updraft fixed-bed reactor, integrated with ex-situ CaO/Si catalytic upgrading. Nine experimental runs were conducted by varying the corncob: pellet ratio (1:1–3:1), catalyst loading (6–10 wt% of 80 g biomass), and CaO/Si ratio (1:1–3:1), while reactor geometry, inlet air speed (10 m/s), and run duration (1500 s) were kept constant. The product gas was routed through an ex-situ catalyst bed, cooled in a condenser, and then analyzed using calibrated MQ sensors (H₂, CH₄, CO, CO₂). Gas composition was monitored using calibrated MQ sensors to provide comparative trends among operating conditions. The best performance was observed in Run 7 (50:50 biomass ratio, 10 wt% catalyst, CaO/Si = 2:1), achieving peak H₂ at 8000 ppm and CH₄ at 46,000 ppm, while CO₂ decreased to 16,000 ppm compared with several other runs. This outcome was consistent with CO₂ sorption by CaO, which can shift reactions toward higher H₂ formation (e.g., via the WGS equilibrium), and was supported by downstream upgrading reactions in the hot-gas line. The results suggest that combining biomass blending with ex-situ CaO/Si upgrading can improve the characteristics of hydrogen-enriched syngas within the investigated operating range.Biomass co-gasification combined with catalytic upgrading offers a promising pathway for enhancing hydrogen-rich syngas production. This study investigates co-gasification of corncob and wood pellets in an updraft fixed-bed reactor, integrated with ex-situ CaO/Si catalytic upgrading. Nine experimental runs were conducted by varying the corncob: pellet ratio (1:1–3:1), catalyst loading (6–10 wt% of 80 g biomass), and CaO/Si ratio (1:1–3:1), while reactor geometry, inlet air speed (10 m/s), and run duration (1500 s) were kept constant. The product gas was routed through an ex-situ catalyst bed, cooled in a condenser, and then analyzed using calibrated MQ sensors (H₂, CH₄, CO, CO₂). Gas composition was monitored using calibrated MQ sensors to provide comparative trends among operating conditions. The best performance was observed in Run 7 (50:50 biomass ratio, 10 wt% catalyst, CaO/Si = 2:1), achieving peak H₂ at 8000 ppm and CH₄ at 46,000 ppm, while CO₂ decreased to 16,000 ppm compared with several other runs. This outcome was consistent with CO₂ sorption by CaO, which can shift reactions toward higher H₂ formation (e.g., via the WGS equilibrium), and was supported by downstream upgrading reactions in the hot-gas line. The results suggest that combining biomass blending with ex-situ CaO/Si upgrading can improve the characteristics of hydrogen-enriched syngas within the investigated operating range.
PENINGKATAN PERFORMANCE SYSTEM PADA DEPARTEMEN PACKAGING DENGAN SIMULASI PROSES DAN REDESIGN WORKSTATION (Studi Kasus : CV. Segar Buah Hutama, Batu) Kamaliyah, Nuzullis Lailatul; Sugiono, Sugiono; Wijayanti, Widya
JEMIS (Journal of Engineering & Management in Industrial System) Vol. 3 No. 1 (2015)
Publisher : Industrial Engineering Department, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jemis.2015.003.01.9

Abstract

Abstract In running the process, the repetitive activity in the production process of the extract of Dewata fruit could cause pain and fatigue on the worker's body. It was because there was a facility that did not meet the rules of workplace ergonomics. Continuous evaluation was needed to know the solution of the problem of musculoskeletal complaint so that it can improve ergonomic working facilities. In making simulation scenario is expected to describe the condition of the actual company so that the improvement proposal can resolve the real issue.The methods that were used in this study include: Biomechanics Assessment (REBA and QEC), anthropometric Design and Simulation Arena. Assessment scores REBA (Rapid Entire Body Assessment) was obtained from the angle of motion depiction of the image carrier (photo) whereas the assessment scores QEC (Quick Exposure Check) was obtained from filling the questionnaire between the observer and the operator. From the research result on the dimension repair facility cooling pond work on workstation 2 (cooling), tables and chairs on the workstation 3 (formation of cardboard box), and the table packaging on the workstation 4 (packaging). In the proposal of improved simulation, it is given resource addition as many as one person on cooling 2 to improve production efficiency from 42.3 % to 100 % so that it is necessary to increase the wage of Rp 1,500,000.00 / month. 
PENDEKATAN LEAN SIX SIGMA, FMEA-AHP UNTUK MENGIDENTIFIKASI PENYEBAB CACAT PADA PRODUK SANDAL DI PT. “X” Wibowo, Moh. Muhyidin Agus; Pratikto, Pratikto; wijayanti, widya
JEMIS (Journal of Engineering & Management in Industrial System) Vol. 4 No. 2 (2016)
Publisher : Industrial Engineering Department, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jemis.2016.004.02.10

Abstract

Abstract Quality is one of problems commonly happen in production. It can be vary and affect the level of product quality and service. Improving quality is needed to keep a good quality of a product. X Inc is one of a company focus on making slipper. The problem is facing by the company is that the method use to decrease the defect and waste is not effective yet. Based on the problem above, a researcher conduct a research and basic concept development lean six sigma to improve the quality by integrating FMEA and AHP in identifying the product defect. It is hoped that the X inc. can keep or maintain and improve the quality in order to fulfill the costumer`s need. Based on the result of FMEA-AHP computation, it is found that IR result is 0,0745. It means that the data is consistent. While priority FMEA-AHP computation for each criteria will be used as reference in making or taking decision. Keywords : lean six sigma approachment, FMEA-AHP, defect, slipper.
THE EFFECT OF SWEET ORANGE PEEL OIL ADDITIVE ON VIRGIN COCONUT OIL COMBUSTION CHARACTERISTIC Sangkilang, Elvinda; Sasmoko, Sasmoko; Wijayanti, Widya; Wardana, ING
International Journal of Mechanical Engineering Technologies and Applications Vol. 7 No. 1 (2026): January - June
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776//MECHTA.2026.007.01.6

Abstract

Biodiesel is a viable renewable alternative energy source to develop and further utilize in order to maintain environmental sustainability. Virgin coconut oil (VCO), which is plentiful in Indonesia, is one of several vegetable oils that has the potential to be converted into biodiesel. The viscosity and density of VCO are high due to the glycerol and three fatty acid components, which have a notable impact on both the performance and efficiency of combustion. Sweet orange peel oil additive plays an important role in enhancing combustion because its chemical compound, which has an aromatic structure, can influence molecular interactions, thereby enhancing the kinetic energy of fuel molecules, which consequently improves the combustion performance of vegetable oil. The combustion process was visually examined using the high-speed camera Canon 600D. The results show that the flame dimensions increased and its color changed from orange to blue, indicating that utilization of sweet orange peel oil could enhance the combustion energy values, the blue color has a greater energy level in the visible light spectrum than the orange hue. Furthermore, it was noted that the ignition delay time showed a decrease in duration, but the burning time showed a comparable pattern of being extended. Vegetable oil deforms and becomes more reactive due to the disruption of its molecular structure caused by the magnetic field of the aromatic structure found in sweet orange peel oil. This phenomenon was confirmed by molecular dynamic simulation using the HyperChem 8.0.10 software.
Co-Authors A.A. Ketut Agung Cahyawan W Ahmad Yani Akbar, Dzulfikar Johan Akhlis Rizza, Muhammad AM Mufarrih Amir, Ahmad Ihwan Andi Nugroho, Andi Christia Meidiana Christian Relmasira, Stefanus Denny Widhiyanuriyawan Dody Candra Kumara, Dody Candra Dwi Irawan Eko Siswanto Farid Majedi, Farid Hamidi, Nurcholis I Nyoman Gede Wardana I.N.G. Wardana Ikhwanul Qiram ING Wardana Kusumastuti, Rizky Kusumo, Herma Nugroho rono adi Lilis Yuliati Mega Nur Sasongko Musyaroh, Musyaroh Nova Risdiyanto Ismail Nurkholis Hamidi Nuryosuwito, Nuryosuwito Nuzullis Lailatul Kamaliyah Pambudi, Wisnu Setyo Catur Pratikto Pratikto Purbo Suwandono Rahmad, Hadi Razi, Misru Razi, Misru Rizaldy, Ahmad Difal Rudy Soenoko S., Sudjito Sangkilang, Elvinda Sasmoko, Sasmoko Setiadhi, David Slamet Wahyudi Sofana, Ilyas Stefanus Christian Relmasira Sudjito Soeparman Sugiono Sugiono Tseng, Chung-Jen Wardana, I. N. G. Wardoyo Wardoyo Wibowo, Moh. Muhyidin Agus Widodo, Agung S. Wijayanto, Vera Dwi