Energy-saving technologies and equipment 73 Copyright © 2022, Authors. This is an open access article under the Creative Commons CC BY license THE INFLUENCE OF VARIOUS PREHEATING AND DIRECTION OF MAGNETIC FIELD ON COMBUSTION CHARACTERISTICS OF PALM OIL DROPLETS FOR BOILER COMBUSTION IN POWER GENERATION SYSTEM Dony Perdana Corresponding author Doctor of Technical Sciences, Lecturer Department of Mechanical Engineering* Е-mail: dony_perdana@dosen.umaha.ac.id Mochammad Hatta Lecturer Department of Computer Engineering* Mochammad Khoirul Rosidin Master’s Student Department of Mechanical Engineering Brawijaya University MT Haryono str., 167, Malang, Indonesia, 65145 Muhamad Hanifudin Assistant Department of Mechanical Engineering* *Maarif Hasyim Latief University Ngelom Megare str., 30, Taman, Sidoarjo, Jawa Timur, Indonesia, 61257 Research has been carried out on the effect of various preheating and the direction of the magnetic field on the flame characteristics of droplet combustion. This study is important to substitute fuel from fossils with vegetable oil that is environment friendly. The variations of the magnetic field are south-south pole, north-north pole, south-north pole, north- south pole, and without. A drop of palm oil is placed on a type K thermocouple between two magnetic rods. The high-speed camera of 120 fps from the front recorded the flame from the start until it went out. The researcher found out the influence of various preheating in palm oil and the magnetic characteristics and behavior of the flame. The direction of the north-south magnetic field had a higher magnetic field strength, caused the droplet combustion to increases resulting in a wider flame but a lower and more stable height com- pared to other magnetic field directions. The speed of combustion affected by the magne- tic field intensity which resulted the flow rate of O 2 , therefore the combustion speed hap- pened quickly because between O 2 and the fuel molecules easily react and were more flammable. The strength of the magnetic field increased oxygen concentration and fuel mole- cule around the reaction zone causing a short burning, resulting in a change delay time the shorter but the flame temperature increased. Stability, shape, temperature, height, delay time and combustion duration were highly valuable to design an efficient heat genera- tor industry with the addition of magnet field. This study provides insight into the influence of magnetic field direction in magnetic field intensity on droplet combustion characteris- tics for boiler combustion in the power gener- ation system Keywords: magnetic field, palm oil, drop- let combustion, flame characteristics, flame stability UDC 697 DOI: 10.15587/1729-4061.2022.267282 How to Cite: Perdana, D., Hatta, M., Rosidin, M. K., Hanifudin, M. (2022). The influence of various preheating and direction of magnetic field on combustion characteristics of palm oil droplets for boiler combustion in power generation system. Eastern- European Journal of Enterprise Technologies, 6 (8 (120)), 73–83. doi: https://doi.org/10.15587/1729-4061.2022.267282 Received date 07.09.2022 Accepted date 14.11.2022 Published date 30.12.2022 1. Introduction The consumption of fossil fuel increases drastically every year across the world due to the increasing population in each country [1], thus looking for sustainable and environmentally friendly energy sources [2]. Various efforts have done by re- searchers to find fossil fuel substitution, one of which by using fuel from vegetable oils and animal fats [3]. Environment friendly renewable energy sources are a potential alternative solution in resolving the depletion of fuel reserves and toxic emission caused by fossil fuel [4]. Biodiesel, biofuel, and biogas are some kinds of alternative energy, the advantage of using vegetable oils is that it has properties similar to diesel fuel [5]. Otherwise, the disadvantages are viscosity and high NO x , but CO and energy produced is lower from diesel [6]. Vegetable oils used directly cause problems because of their high viscosity [7], which causes difficulties in the operation of the machine [8]. Production of high heat energy radiation needs effective flame stability; therefore, further research is needed. This work provides combustion fact efficient and stable heat generation using preheating of vegetable oil and magnetic fields. Single droplet combustion is low-cost and an effective analytical method for characterizing fuels based on their pro- perties [6]. Therefore, studies that are devoted are especially regarding preheated vegetable oil fuels and the influence of magnetic fields in stabilizing the combustion process so as to produce high thermal in power plants are scientific relevance.