Combustion Improvement of Diesel Engine by Mixing ·OH Radical to Fuel Derived from Ultrafine Bubble

抄録

  The environmental pollution with exhaust gases of fuel combustions is one of the serious global problems. IMO (International Maritime Organization) has issued the NOx emission rules, Tier I started from 2011, and Tier III from 2016. As a result, technologies to reduce NOx concentration, and also PM concentration, have been developed around the world. At the same time, rules to reduce PM and SOx have been issued by limiting sulfur content in fuel oils used on board. At ECA (Emission Control Area), fuel with a sulfur content of no more than 0.1% must be used from 2015. Outside ECA, the sulfur limitation will be reduced from 3.5% to 0.5% in 2020. However, at present, despite of recent advances in technologies, So we combine treatment technologies, regulation must be satisfaction. Improvement of suction air and Fuel is before treatment technology, such as EGR (Exhaust Gas Recirculation) and water emulsified fuel. Reduction of NOx concentration is SCR (Selective Catalytic Reduction), Reduction of PM concentration is DPF (Diesel Particulate Filter), and they are after treatment technology. However, new regulation is severe restriction, we must develop new technology. UFB (Ultrafine Bubble) water is included bubbles of less than 1μm, and it has several radical. ·OH radical is improved combustion, such as spark purge. The objective of this study is to reduce the pollutants from diesel exhaust gas and improve the fuel consumption by mixed with ·OH radical into the fuel. The authors developed a device and extracting radical element from Ultrafine Bubbles (UFB) water and mixing the extracted ·OH radical with special loop. This study is to reduce the pollutants from diesel exhaust gas and improve the fuel consumption by mixed with ·OH radical into the fuel. The outcomes of the results are summarized as follows: (1) We obtained the following conclusion from the above experiment condition; mixing ·OH radical into the fuel by atomization of UFB water. (2) Atomization of UFB water into the fuel can reduce NOx of 25% and PM of 70%, and be able to be improved fuel consumption of 10% by diesel engine. (3) Atomization of UFB water into the water emulsified fuel can reduce NOx of 55% and PM of 85%, and be able to be improved fuel consumption of 20% by diesel engine.