PM充電器と静電水スクラバによるNOx PMの低減: スクラバ水滴挙動によるPM捕集効率の変化

摘要

In recent years exhaust emissions regulations are gradually becoming stricter, and a reduction of exhaust gas density is a pressing need, thus highlighting the need for research in emissions reduction. This study develops an electrostatic water atomization scrubber that combines dryness electrostatic dust collection with the merit of the scrubber to remove NOx and PM in exhaust gas. It is a mechanism using electrification, where a charged drop of water collects PM in opposite polarity using Coulomb attraction. NOx is dissolved into the solvent, and a mist spray is used for atomization. With air pressure of 0.10MPa, the particle diameter in the horizontal direction was steady, and the influence by flowing quantity was almost zero. If the particle diameter in the vertical direction becomes far from the atomization entrance, the particle diameter has grown. We can collect PM of distinct diameters by increasing the particle diameters. A flow quantity of 200mL/min was the maximum PM collection rate with only the water scrubber of static electricity. It was possible to decrease NOx about 14% and PM about 100% while using this combination with the PM charger.%近年，環境問題が大きく取りあげられ，排出ガス規制は，年々厳しくなっている．排出ガス濃度の低減は急務であり，高い低減効率を持ち備えた研究が必須である．本研究は，排州ガス中のNOx，PMを取り除くため，乾燥静電集塵機とスクラバの長所を組み合わせた静電水スクラバを開発した．PMと水滴を逆の極性に帯電させ，荷電された水滴がクーロン引力によってPMを捕焦する仕組みである．NOxは溶媒に溶解させた・スプレは，霧化用空気で霧状にした．空気仕は0.10MPaで水平方向の粒子径が安定し，流量による影響はほぼ皆無であった．また，垂直方向の粒子径は噴霧口から離れるほど粒子径が大きくなった．これらの粒子径の増加によって，粒径が異なるPMが均等に捕集できると考える．スクラバ単体実験では200mL/minでPM捕集率が最大となり，PM充電器と組み合わせることでNOxは約14％，PMは約100％低減できた．