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All Journal Buletin Udayana Mengabdi Jurnal Energi Dan Manufaktur International Journal of Renewable Energy Development Jurnal Mechanical Jurnal METTEK (Jurnal Ilmiah Nasional Dalam Bidang Ilmu Teknik Mesin) Dinamika Teknik Mesin : Jurnal Keilmuan dan Terapan Teknik Mesin International Journal of Engineering and Emerging Technology International Journal of Renewable Energy Development
I.K.G. Wirawan
Mechanical Engineering Department, Udayana University, Bali
Aerospace Engineering Automotive Engineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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Analisa Pengaruh Variasi Diameter Bed Material Pasir Silika pada Fluidized Bed Combustion Limbah Medis Terhadap Pergerakan Fluidisasi I Made Panji Tirta Prakasa; I Nyoman Suprapta Winaya; I Ketut Gede Wirawan; I Wayan Arya Darma
Jurnal Mettek: Jurnal Ilmiah Nasional dalam Bidang Ilmu Teknik Mesin Vol 8 No 2 (2022)
Publisher : Program Studi Magister Teknik Mesin Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/METTEK.2022.v08.i02.p04

Abstract

Pandemi Covid-19 menyebabkan meningkatnya penggunaan layanan kesehatan yang sangat signifikan sehingga jumlah limbah medis yang dihasilkan akibat kegiatan ini cukup tinggi. Limbah medis termasuk ke dalam kategori limbah B3 yang harus ditangani dan dikelola dengan baik. Salah satu teknologi yang mampu mereduksi limbah tersebut yaitu insenerator jenis Fluidized Bed Combustion (FBC). Teknologi FBC ini menggunakan media pengaduk berupa pasir yang akan bercampur dengan bahan bakar dan dalam proses pembakarannya menggunakan temperature yang tinggi, namun dalam pembakaran tipe FBC ini memungkinkan terjadinya suatu aglomerasi di dalam reaktor. Salah satu yang menyebabkan terjadinya aglomerasi tersebut adalah pergerakan bed material dalam proses fluidisasi ini kurang maksimal. Oleh sebab itu, pada penelitian ini melakukan pengujian secara permodelan untuk mengetahui proses fluidisasi terhadap lonjakan bed material menggunakan software Circulating Particle Fluids Dynamic (CPFD) Barracuda Virtual Reactor. Dalam penelitian ini adapun variasi bed material yang digunakan adalah pasir silika dengan variasi diameter DA (0,2 mm), DB (0,5 mm), DC (0,8 mm), DD (1,1 mm). Kecepatan aliran udara fluidisasi ditetapkan sebesar 4 m/s dan tekanannya diberikan sebesar 1 atm. Menurut hasil simulasi, proses fluidisasi yang terbaik ditunjukkan oleh variasi pasir silika DA dengan tinggi lonjakan 80 cm dari permukaan reaktor. Sedangkan variasi diameter lainnya seperti DB, DC, DD berturut-turut tercatat hanya mencapai ketinggian 65 cm; 40 cm; 25 cm dari dasar rekator. The Covid-19 pandemic has caused the utilization of health services to be very significant so that the amount of medical waste generated from this activity is quite high. Medical waste is included in the category of B3 waste that must be handled and managed properly. One technology that can reduce this waste is the Fluidized Bed Combustion (FBC) type incinerator. This technology uses a mixture of sand mixed with fuel and in a high temperature combustion process, but in this type of FBC combustion it is possible for agglomeration to occur in the reactor. One of the causes of agglomeration is the movement of bed material in the fluidization process that is not optimal. Therefore, in this research, a modeling test was conducted to determine the basic material fluidization process using the Barracuda Virtual Reactor's Circulating Particle Fluids Dynamic (CPFD) software. Variations of bed material used are silica sand with a diameter of DA (0,2 mm), DB (0,5 mm), DC (0,8 mm), DD (1,1 mm). The fluidization air flow velocity is set at 4 m/s and the applied pressure is 1 atm. Based on the simulation results, the best fluidization process is indicated by the variation of silica sand with a diameter of DA and a height of 80 cm from the reactor surface. While other diameter variations such as DB, DC, DD each recorded reaching a height of only 65 cm; 40 cm; 25 cm from the bottom of the reactor.
MESIN PENCACAH SAMPAH ORGANIK SKALA RUMAH TANGGA I.K.G. Wirawan; I.K.G. Sugita; M. Suarda; K. Astawa
Buletin Udayana Mengabdi Vol 23 No 2 (2024): Buletin Udayana Mengabdi
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BUM.2024.v23.i02.p03

Abstract

Kuta Utara is a district in Badung Regency, Bali, Indonesia, which consists of six villages, one of which is Kerobokan Kaja. The use of yards as land for ornamental plants in Kerobokan Kaja is very high, reaching up to 65%. The consequence of this large number of ornamental plants is the amount of leaf waste produced by plants in each house. This leaf litter can be used as a basic material for compost. These leaves need to be chopped in order to expand the contact area so that the decomposition process will be faster. Therefore it is necessary to make a household scale organic waste chopper machine. Aside from speeding up the decomposition process, this chopper machine also reduces the volume of organic waste, especially leaves by up to 60%. With this organic waste chopper, it is expected to reduce the volume of waste that burdens the Final Processing Site. Keywords: decomposition, chopping machines, volume reduction, organic waste, household scale
Premixed Combustion of Kapok (ceiba pentandra) seed oil on Perforated Burner Wirawan, I.K.G.; Wardana, I.N.G.; Soenoko, Rudy; Wahyudi, Slamet
International Journal of Renewable Energy Development Vol 3, No 2 (2014): July 2014
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.3.2.91-97

Abstract

Availability of fossil fuels in the world decrease gradually due to excessive fuel exploitation. This situations push researcher to look for alternative fuels as a source of renewable energy, one of them is kapok (ceiba pentandra) seed oil. The aim this study was to know the behavior of laminar burning velocity, secondary Bunsen flame with open tip, cellular and triple flame. Premixed combustion of kapok seed oil was studied experimentally on perforated burner with equivalence ratio (φ) varied from 0.30 until 1.07. The results showed that combustion of glycerol requires a large amount of air so that laminar burning velocity (SL) is the highest at very lean mixture (φ =0.36) in the form of individual Bunsen flame on each of the perforated plate hole.  Perforated and secondary Bunsen flame both reached maximum SL similar with that of ethanol and higher than that of hexadecane. Slight increase of φ decreases drastically SL of perforated and secondary Bunsen flame. When the mixture was enriched, secondary Bunsen and perforated flame disappears, and then the flame becomes Bunsen flame with open tip and triple flame (φ = 0.62 to 1.07). Flame was getting stable until the mixture above the stoichiometry. Being isolated from ambient air, the SL of perforated flame, as well as secondary Bunsen flame, becomes equal with non-isolated flame. This shows the decreasing trend of laminar burning velocity while φ is increasing. When the mixture was enriched island (φ = 0.44 to 0.48) and petal (φ = 0.53 to 0.62) cellular flame take place. Flame becomes more unstable when the mixture was changed toward stoichiometry.
Premixed Combustion of Coconut Oil on Perforated Burner Wirawan, I.K.G.; Wardana, I.N.G.; Soenoko, Rudy; Wahyudi, Slamet
International Journal of Renewable Energy Development Vol 2, No 3 (2013): October 2013
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2.3.133-139

Abstract

Coconut oil premixed combustion behavior has been studied experimentally on perforated burner with equivalence ratio (φ) varied from very lean until very rich. The results showed that burning of glycerol needs large number of air so that the laminar burning velocity (SL) is the highest at very lean mixture and the flame is in the form of individual Bunsen flame on each of the perforated plate hole. As φ is increased the  SL decreases and the secondary Bunsen flame with open tip occurs from φ =0.54 at the downstream of perforated flame. The perforated flame disappears at φ = 0.66 while the secondary Bunsen flame still exist with SL increases following that of hexadecane flame trend and then extinct when the equivalence ratio reaches one or more. Surrounding ambient air intervention makes SL decreases, shifts lower flammability limit into richer mixture, and performs triple and cellular flames. The glycerol diffusion flame radiation burned fatty acids that perform cellular islands on perforated hole.  Without glycerol, laminar flame velocity becomes higher and more stable as perforated flame at higher φ. At rich mixture the Bunsen flame becomes unstable and performs petal cellular around the cone flame front. 
Co-Authors Adi Purnawan Ainul Ghurri Ari Dwi Agus Sulistyo I Dewa Gede Ary Subagia I G.N.O. Suputra I Gusti Ketut Sukadana I Gusti Komang Dwijana I Gusti Ngurah Putu Tenaya I K. A. Atmika I Ketut Adi Sugita I Made Astika I Made Panji Tirta Prakasa I Made Suinata I Nengah Suarnadwipa I Nengah Suweden I Nyoman Suprapta Winaya I Wayan Arya Darma I.D.M.K. Muku I.G.K. Sukadana I.K.A. Atmika I.M. Astika I.N.G. Wardana K. Astawa M. Sucipta Made Suarda Ngurah Putra Wibawa Rudy Soenoko Siti Helmyati Slamet Wahyudi Tri Siswanto Kamid Wayan Nata Septiadi