Effect of water condensation on size of nano-PM from combustion

2018 Fiscal Year Final Research Report

• Project/Area Number: 17K18140
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Thermal engineering; Environmental engineering and reduction of environmental burden
• Research Institution: Tokyo Denki University
• Principal Investigator: KOBAYASHI Yoshihiro 東京電機大学, 工学部, 准教授 (00550576)
• Project Period (FY): 2017-04-01 – 2019-03-31
• Keywords: ＰＭ / Ｓｏｏｔ / Ａｇｇｒｅｇａｔｉｏｎ / Ｆｌａｍｅ

Outline of Final Research Achievements

PM (Particulate Matter) aggregation technique by water vapor addition was attempted to reduce fine PM. PM exhausted from a toluene laminar diffusion flame formed by pool combustion system was used as test sample. Particle diameter (DPM) distribution of PM was measured by a Low Pressure Impactor. Water vapor was supplied from two positions, 30mm distance from the pool edge (around the flame tip) and other is far distance from the flame tip. In case of water vapor addition, mass flow rate of water-condensed PM in range of 250nm < DPM < 2300nm was lower than that of non-treated PM and mass flow rate of water-condensed PM in range of DPM >2300 nm was higher than that of non-treated PM. Therefore, it was considered that aggregation PM increased at water vapor addition and condensation.

Free Research Field

熱工学

Academic Significance and Societal Importance of the Research Achievements

本研究成果は水蒸気凝縮を利用することでPMの凝集を促進させられる可能性を示したが，これによりPM後処理装置の縮小化につながること，さらには現在問題視されている極微小PMを除去する手段になりえる可能性が考えられる．また，PMの凝集過程は不明な点が多くあるが，研究の実施によってある程度凝集についての知見を得ることができた．