コロナ放電とCa (OH)₂による船舶排ガス低減技術の開発

抄録

 Emission regulations for ships have become increasingly strict. In 2016, Tier 3 regulations will be implemented by the International Maritime Organization (IMO) which makes the reduction of NOx emissions in Emission Control Areas (ECA) by 80% obligatory. Thus, there is a pressing need to develop emission control technologies in order to meet these stringent regulations. Generally, in exhaust emissions treatment, there are trade-off problems to be solved. The aim of this research is to simultaneously reduce CO₂, NOx, PM, and SOx. The authors developed a system in which an emissions charger and electrostatic water scrubber using corona discharge are used with Ca(OH)₂ solution. PM can be collected using static electricity by spraying electrostatic water. O₃ emanating from the corona discharge can convert NO into NO₂, and NO₂ and SOx can dissolve well in water. In addition, Ca(OH)₂ can detoxify waste water generated by aftertreatment. Using this emission reduction technique, NOx, SOx and CO, and PM were reduced by 75 %, 80 %, and 100%, respectively.