The Study Program of Doctoral Engineering Science (PSDIT) held its 87th doctoral promotion on Monday, 17 March 2025, at the Wismakarma Hall, Faculty of Engineering, Udayana University on Jl. P.B. Sudirman Denpasar. Promovendus I Wayan Temaja, ST., MT with the dissertation titled Study on The Effect of Bed Materials and Gas Agents on the Gasification Performance of Dual Reactor Fluidized Beds using Municipal Solid Waste as Feedstock received a very satisfactory predicate.

Dr. I Wayan Temaja, St. , MT explains that this study is developing the concept of waste energy treatment technology by modifying the gasification reactor in two connected reactors. These reactors are linked to loops, where bed material is circulated and heat can be stored and moved between the two reactors. The results of the study show that increased composition of H2, CO, gas calorific value and gasification efficiency is associated with higher operating temperatures. The increase in syngas formation is driven by an increase in reaction rate with increasing gasification temperature. Testing of various bed materials showed that dolomites resulted in the highest composition of H2 and CO. In comparison, iron sand produced syngas with a better composition of H2, CO, and CH4 than silica sand (typically used), although it was still lower than dolomite. The surface profile and particle size of the bed material have a significant impact on heat transfer to the output and affects the gas formation reaction. The main elements available in connections such as Eisen Sand and Dolomite Si, Fe, Ca, and Sio2, Fe2O3, CaO contribute to the thermal resistance of the layer material and can act as catalysts during Syngas formation. The calorific value of the gas and the efficiency of gasification are determined by the composition of H2 and CO of the syngas. The use of inexpensive and abundant air leads to syngas, which has a limited composition of H2 and CO. Conversely, the use of steam increases the formation of syngas with a high H2 composition and a preferred H2/CO ratio through the water gas reaction. Using CO2 as a therapeutic agent promotes a higher composition of CO, but the Boudouard response results in a lower H2/CO ratio.

As chairman of the session is the Coordinator of PSDIT, Prof. Dewa Made Priyantha Wedagama, ST., MT., MSc., Ph.D. The promoter, co-promoters I and II are Prof. I Nyoman Suprapta Winaya, S.T., M.A.Sc., Ph.D., Dr. Ir. I Ketut Gede Wirawan, M.T, and Prof. Dr. Eng. Made Sucipta, S.T., M.T., IPM. respectively. Acting as examiners are Ainul Ghurri, S.T., M.T., Ph.D., Dr. Ir. I Gusti Ngurah Priambadi, M.T., Dr. Ir. I Wayan Bandem Adnyana, M.Erg., Dr. Ir. Made Suarda, M.Eng., Dr. Si Putu Gd. Gunawan Tista, S.T., M.T., Dr. Ir. Hendra Wijaksana, M.Sc, and Dr. Ir Wayan Nata Septiadi, S.T., M.T. Academic invitees are all from Bali State Polytechnic: Prof. I Dewa Made Cipta Santosa, ST., M.Sv., P.hD., Prof. Dr. Ir. I Made Rasta, M.Si., Prof. Dr. I Putu Wijaya Sunu, ST., MT, and Dr. I Made Rajendra, ST., M.Eng.