Characterization of solid deposits from urea water solution injected into a hot gas test rig

被引：38
作者：
Boernhorst, M. [1 ]
Langheck, S. [1 ]
Weickenmeier, H. [1 ]
Dem, C. [1 ]
Suntz, R. [1 ]
Deutschmann, O. [1 ]
机构：
[1] KIT, Inst Chem Technol & Polymer Chem, Kaiserstr 12, D-76128 Karlsruhe, Germany
来源：
CHEMICAL ENGINEERING JOURNAL | 2019年 / 377卷
关键词：
Selective catalytic reduction; Urea; Decomposition; Deposits; Nitrogen oxides; Emission control; SELECTIVE CATALYTIC-REDUCTION; METAL-EXCHANGED ZEOLITES; ISOCYANIC ACID; HYDROLYSIS; SCR; DECOMPOSITION; PERFORMANCE; EMISSIONS; PYROLYSIS; KINETICS;
D O I：
10.1016/j.cej.2018.09.016
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Recent developments in mobile emission legislations have created an urgent need for effective ammonia preparation for Selective Catalytic Reduction (SCR) of nitrogen oxides from diesel exhaust. The present work deals with the problem of solid by-product formation from urea injected to the tailpipe as precursor for ammonia. A hot gas test rig is designed to perform experiments on deposit formation at well-defined operating conditions. Generated deposits are sampled for detailed analyses of topography and chemical composition. Dimensions and chemical decomposition kinetics of the samples are correlated with the respective operating conditions and reference data, which result from detailed analysis of the decomposition kinetics of urea water solution and pure by-products. Results show the influence of temperature and urea dosing strategy on the amount of generated deposits. Investigations on deposit composition reveal incompleteness of existing decomposition mechanisms and present data for further development of urea decomposition kinetics.
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页数：9
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