ID 113623
著者
Matsui, Hitoshi ISUZU MOTORS LIMITED
Udagawa, Kazumasa ISUZU MOTORS LIMITED
Kamimoto, Takahiro Tokushima University
キーワード
Measurement and instrumentation
CT tunable diode laser absorption spectroscopy
NH3 concentration measurement
Urea selective catalytic reduction
Exhaust aftertreatment
資料タイプ
学術雑誌論文
抄録
Urea Selective Catalytic Reduction (urea SCR) system is widely used for diesel engine to reduce the emission of NOx by NH3 which is provided by a hydrolysis of urea water. Concentration distribution of NH3 in an exhaust pipe is an important factor for improvement of the SCR efficiency and prevention of NH3 slip and urea deposit. Therefore, it is necessary to measure two-dimensional (2D) concentration of NH3 in detail. The purpose of this study is to develop the real-time two cross-sectional measurements technology of NH3 concentration using the computed tomography-tunable diode laser absorption spectroscopy (CT-TDLAS). Theoretical NH3 concentration distribution which was reconstructed by CT agreed to CFD results and quadruple pipe’s results showed good resolution by 14th order reconstruction. Therefore, this method has enough resolution and accuracy for measuring the concentration distribution of NH3. And this method was employed in a bent pipe model demonstrated a urea SCR system. The experimental results of two cross-sectional 2D concentration of NH3 show differences of the concentration distribution of NH3 each cross-section and flow pattern like swirl flow. It was found that CT-TDLAS was an effective method to measure concentration distribution of NH3 and observe characteristics of flow. In addition, observing flow pattern enable to validate CFD results, and it helps to improve efficiency of after treatment system.
掲載誌名
Journal of Thermal Science and Technology
ISSN
18805566
出版者
The Japan Society of Mechanical Engineers and The Heat Transfer Society of Japan
14
2
開始ページ
JTST0016
発行日
2019
EDB ID
出版社版DOI
出版社版URL
フルテキストファイル
言語
eng
著者版フラグ
著者版
部局
理工学系