Experimental investigation on evaporation of urea‐water‐solution droplet for SCR applications |
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| Authors: | Tae Joong Wang Seung Wook Baek Seung Yeol Lee Dae Hwan Kang Gwon Koo Yeo |
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| Affiliation: | 1. Propulsion and Combustion Laboratory, School of Mechanical, Aerospace and Systems Engineering, Korea Advanced Institute of Science and Technology (KAIST), 373‐1 Guseong‐dong, Yuseong‐gu, Daejeon 305‐701, Republic of Korea;2. Head of Technology Center, Technology Center, ORDEG Corporation, 404 Mognae‐dong, Danwon‐gu, Ansan‐si, Gyeonggi‐do 425‐100, Republic of Korea;3. Principal Research Engineer, Emission Research Team, Advanced Technology Center, Hyundai‐Kia Motors, 772‐1 Jangduk‐dong, Hwaseong‐si, Gyeonggi‐do 445‐706, Republic of Korea |
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| Abstract: | The evaporation behavior of urea‐water‐solution (UWS) droplet was investigated for application to urea‐selective catalytic reduction (SCR) systems. A number of experiments were performed with single UWS droplet suspended on the tip of a fine quartz fiber. To cover the temperature range of real‐world diesel exhausts, droplet ambient temperature was regulated from 373 to 873 K using an electrical furnace. As a result of this study, UWS droplet revealed different evaporation characteristics depending on its ambient temperature. At high temperatures, it showed quite complicated behaviors such as bubble formation, distortion, and partial rupture after a linear D2‐law period. However, as temperature decreases, these phenomena became weak and finally disappeared. Also, droplet diminishment coefficients were extracted from transient evaporation histories for various ambient temperatures, which yields a quantitative evaluation on evaporation characteristics of UWS droplet as well as provides valuable empirical data required for modeling or simulation works on urea‐SCR systems. © 2009 American Institute of Chemical Engineers AIChE J, 2009 |
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| Keywords: | evaporation aqueous solutions selective catalytic reduction NOx urea |
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