Numerical analysis on the mixing and urea crystallization characteristics in the SCR system

2021 ◽  
pp. 108715
Author(s):  
Qiang Zhang ◽  
Yao Zhang ◽  
Sidong Shao ◽  
Menghan Li
Keyword(s):  
Numerical Analysis ◽  
Urea Crystallization ◽  
Scr System

Experimental Study of Urea Depositions in Urea-SCR System

2014 ◽  
Vol 937 ◽  
pp. 74-79 ◽  
Author(s):  
Shu Zhan Bai ◽  
Shuai Guo Lang ◽  
Ke Ping Yuan ◽  
Yang Liu ◽  
Guo Xiang Li
Keyword(s):  
Control Strategy ◽  
Structural Design ◽  
Cyanuric Acid ◽  
Exhaust System ◽  
Structure Design ◽  
Exhaust Pipe ◽  
Front End ◽  
Urea Crystallization ◽  
Exhaust Stream ◽  
Scr System

Avoiding the urea deposition in the exhaust stream is one of the basic requirements for SCR system normal application. Unreasonable structure design, machining and installation position all could lead to urea crystallization on the wall of exhaust pipe and the front end surface of the catalyst, in addition, unreasonable control strategy also could deteriorate this phenomenon. The components of the urea depositions are the urea and cyanuric acid analyzed by thermogravimetry - FTIR technology. The integrated injector mounting is designed to alleviate the urea crystallization based on analysis results. The engine test and the vehicle road test are all shown that the optimal structural design and calibration strategies could avoid crystallization and sedimentation effectively in the exhaust system.

scholarly journals Numerical analysis of NOx reduction for compact design in marine urea-SCR system

2015 ◽  
Vol 7 (6) ◽  
pp. 1020-1034 ◽  
Author(s):  
Cheolyong Choi ◽  
Yonmo Sung ◽  
Gyung Min Choi ◽  
Duck Jool Kim
Keyword(s):  
Numerical Analysis ◽  
Nox Reduction ◽  
Compact Design ◽  
Scr System

scholarly journals Numerical Analysis of Urea Decomposition with Static Mixers in Marine SCR System

2015 ◽  
Vol 3 (1) ◽  
pp. 39-42 ◽  
Author(s):  
Cheolyong Choi ◽  
Yonmo Sung ◽  
Gyung Min Choi ◽  
Duck Jool Kim
Keyword(s):  
Numerical Analysis ◽  
Static Mixers ◽  
Scr System ◽  
Urea Decomposition

scholarly journals Urea Injection and Uniformity of Ammonia Distribution in SCR System of Diesel Engine

2020 ◽  
Vol 5 (2) ◽  
pp. 129-142 ◽  
Author(s):  
Yunjing Jiao ◽  
Qingping Zheng
Keyword(s):  
Kinetic Mechanism ◽  
Decomposition Reaction ◽  
Spray Angle ◽  
Ammonia Gas ◽  
Injection Angle ◽  
Flow Field Characteristics ◽  
Urea Crystallization ◽  
Distribution Uniformity ◽  
Scr System ◽  
Urea Decomposition

AbstractThe kinetic mechanism of chemical reaction was used to calculate the coupling of the fluid kinetics with the urea decomposition reaction and the SCR reaction kinetics. Combined with the engine test and simulation, the distribution uniformity of the urea injection and ammonia gas was studied. Through numerical simulation on urea spray and exhaust flow in Urea-SCR system, the flow field characteristics in whole after-treatment system are gotten. By using numerical calculation in different urea injection angle and orifice sizes, the urea-crystallization and ammonia distribution have been studied and the optimal urea spray angle and nozzle size are given.

Analysis of Urea Solution and Experimental Study for Adaptability of SCR Converter in Vehicular Diesel Engines

2011 ◽  
Vol 354-355 ◽  
pp. 123-126
Author(s):  
Qian Wang ◽  
Ping Qi ◽  
Xiao Jing Han ◽  
Ming Xing Zhou
Keyword(s):  
Test Bench ◽  
Solution Concentration ◽  
Urea Solution ◽  
Engine Test ◽  
Engine Test Bench ◽  
Scr Catalyst ◽  
Nox Conversion ◽  
Different Temperatures ◽  
Urea Crystallization ◽  
Scr System

In this paper, the Urea-SCR system is first introduced; then change of the urea solution concentration under different temperatures with time lapsing is given. Meanwhile, conditions for the urea crystallization are analyzed and SCR converter adaptability is tested under high sulfur environment on engine test bench. As the efficiency of NOx conversion is not significantly reduced after aging and the activity of the catalyst is very little damaged by dense sulfur content in fuel, SCR catalyst is able to adapt to the application of high-sulfur-contained fuel environment in our country.

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