Ash Accumulation and Transport in Diesel Particulate Filters (Second Report)

ディーゼルパティキュレートフィルタ内の アッシュ堆積および輸送に関する研究(第2 報)

Accelerated ash accumulation techniques were established by means of diesel particulate generator (DPG) in which engine oil injector is installed. Three diesel particulate filter (DPF) samples with different active regeneration frequency were made by DPG then the ash accumulation distribution was observed nondestructively by X-ray computed tomography (CT). As a result, it was clarified that ash distribution is drastically changed by active regeneration frequency, and soot load is important factor on ash transport during DPF regeneration. Scanning electron microscope (SEM) observations of ash both before and after regeneration were also conducted and it was confirmed that ash particle size grows due to crystallization by ash sintering after regeneration. In addition, from the analysis of change in ash accumulation amount before and after regeneration, it was suggested that ash passing through the DPF may occur during active regeneration.本研究では,ディーゼルスート発生器(DPG)にエンジンオイル噴射弁を取付け,DPFに加速的にアッシュを堆積させる手法を構築した.はじめに,DPFに流入するアッシュをサンプリングし熱処理前のアッシュ粒子を対象にXRD分析およびSEM観察を行った.その結果,熱処理前は数十nmの一次粒子を有するアッシュ粒子が主体であるのに対し,DPF再生を想定した650℃加熱後のアッシュはシンタリングにより結晶化が進み,数百nmの粗大な塊状になることが分かった.さらに,強制再生頻度によってアッシュ堆積分布が顕著に変化し,堆積運転時のスート/アッシュ比が再生時のアッシュ輸送に重要な因子であることを明らかにした.

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  • English
  • Japanese

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  • Accession Number: 01689417
  • Record Type: Publication
  • Source Agency: Japan Science and Technology Agency (JST)
  • Files: TRIS, JSTAGE
  • Created Date: Nov 26 2018 3:01PM