THE EFFECTS OF HYDROGEN-OXYGEN STOICHIOMETRIC MIXTURE GAS (HHO) ON COMBUSTION QUALITY OF 50% PURE PLANT OIL FUELED DIRECT INJECTION DIESEL ENGINE

• Main Author: SYAUQI SHAUTAL ALAM (NIM : 23108002); Tim Pembimbing : Dr. Ir. Iman Kartolaksono Reksowardojo, A, M.
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/16512
• Institution: Institut Teknologi Bandung

New sources of energy are needed to supplement and or replace fossil fuels in order for Indonesia to become self-sufficient. One possibility is the use of oils extracted from plant sources. Diesel engine can operate fueled by either pure plant oils (PPO) or biodiesel. Extraction of PPO’s is a simple low cost process. But processing PPO to produce biodiesel significantly increases the cost per unit of energy due to the several processes required. Research to date on the use of PPO as a fuel for diesel engines indicates that PPO’s have several disadvantages compared to diesel and biodiesel because of higher viscosity, lower heating value, and low volatility. These characteristics are reflected in lowered combustion efficiency and increased deposits in the combustion chamber. To offset these disadvantages this research investigated the effect of blending PPO with diesel in the ratio of 1:1 by volume, heating the fuel to 65°C, and providing hydrogen supplementation at a low rate to improve combustion properties. This experiment was using 1007 cc single cylinder, direct injection, four strokes diesel engine. Maximum power of the engine is 14.2 kW with compresion ratio 18.5. Test fuels are including pure coconut oil (PCO), pure palm oil (PPaO), pure jatropha oil (PJO), and diesel fuel as datum. As a result, HHO gives good effect to decrease engine’s break specific fuel consumption (BSFC). On full load, the engine gives higher torque and power with HHO. On the same condition, BSFC for PCO, PPaO, and PJO are 8.57%, 6.26%, 2.47% higher than diesel fuel for each fuel. After introducing HHO into combustion chamber, the BSFC for PCO decreased by 3,51%, PPaO decreased by 1,89%, and PJO decreased by 4,44%. On constant speed test, average BSFC difference with diesel fuel on 2000rpm for PCO = 6,67%, PPaO = 7,7%, PJO = 6,37%. After introducing HHO, BSFC reduction for PCO = 2,28%, PPaO = 0,7%, PJO = 1,42%. On emission test, HHO also reduced HC and CO. The average difference for HC emission compared with diesel fuel for PCO = 33,05%, PCO+H2 = 25,45%, PPaO = -0,98%, PPaO+H2 = -11,1%, PJO = 13,05%, dan PJO+H2 = 10,67%. These data showed us that HHO gives better combustion on PPO.