scholarly journals Modeling and Multi-Objective Optimization of NOx Conversion Efficiency and NH3 Slip for a Diesel Engine

2016 ◽  
Vol 8 (5) ◽  
pp. 478 ◽  
Author(s):  
Bo Liu ◽  
Fuwu Yan ◽  
Jie Hu ◽  
Richard Turkson ◽  
Feng Lin
Keyword(s):  
Diesel Engine ◽  
Conversion Efficiency ◽  
Multi Objective Optimization ◽  
Multi Objective ◽  
Nox Conversion ◽  
Nox Conversion Efficiency

scholarly journals Research on Optimization Design of SCR Nozzle for National VI Heavy Duty Diesel Engine

Catalysts ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 452 ◽  
Author(s):  
Feng Qian ◽  
Dong Ma ◽  
Neng Zhu ◽  
Peng Li ◽  
Xiaowei Xu
Keyword(s):  
Diesel Engine ◽  
Conversion Efficiency ◽  
Optimization Design ◽  
Exhaust Pipe ◽  
Heavy Duty ◽  
Deposit Formation ◽  
Nox Conversion ◽  
Heavy Duty Diesel ◽  
Scr System ◽  
Nox Conversion Efficiency

For the National VI heavy-duty diesel vehicles, NOx emission regulations are becoming more and more stringent, and the selective catalytic reduction (SCR) system has become a necessary device. The design of the adblue nozzle in the SCR system is especially critical, directly affecting the NOx conversion efficiency and deposit formation. According to the structure of a National VI diesel engine exhaust pipe and SCR system, the nozzle is optimized by computational fluid dynamics (CFD) method to avoid the collision between the urea droplets and the exhaust pipe wall, to ensure that the exhaust gas and the urea droplets are as much as possible in full contact to ensure a sufficient urea pyrolysis. With the optimized nozzle, the NH3 distribution uniformity of the inlet face of the SCR catalyst can increase from 0.58 to 0.92. Additionally, test verifications are implemented based on the spray particle size test and the engine bench tests; the results show that the Sauter mean diameter of the optimized nozzle is more decreased than the initial nozzle and that the NOx conversion efficiency of the World Harmonized Transient Cycle (WHTC) and World Harmonized Stationary Cycle (WHSC) cycle improves by nearly 3%; additionally, it can also avoid deposit formation.

Study on the Cu-ZSM-5 Catalyst for SCR System of Diesel Engine

2012 ◽  
Vol 532-533 ◽  
pp. 82-86
Author(s):  
Wei Li ◽  
Ling Shan Chen ◽  
Xiong Liu ◽  
Yi Liu
Keyword(s):  
Diesel Engine ◽  
Low Temperature ◽  
Fuzzy Sets ◽  
Conversion Efficiency ◽  
Nox Emissions ◽  
Nox Conversion ◽  
Activity Temperature ◽  
Scr System ◽  
Nox Conversion Efficiency

In this paper, we shall first briefly introduce fuzzy sets and related concepts of the reaction principle of Cu-ZSM-5 catalyst with the NO, and the preparation of Cu-ZSM-5 catalyst is also investigated. And the NOx conversion efficiency of Cu-ZSM-5 catalyst is analyzed with the experiment. Compared to V2O5/WO3/TiO2catalyst, the reaction activity of Cu-ZSM-5 catalyst at low temperature is much better, while the range of reaction activity temperature of V2O5/WO3/TiO2catalyst is relatively wide. Finally, with the diesel engine ESC test, the Cu-ZSM-5 Catalyst for SCR system can effectively reduce the NOx emissions, and the diesel engine which is installed the SCR is able to achieve the requirements of Euro Ⅳ for NOx limits.

scholarly journals Experimental Research on Distribution Characteristics of NOx Conversion Efficiency of a Diesel Engine SCR Catalyst

ACS Omega ◽  
2021 ◽  
Vol 6 (36) ◽  
pp. 23083-23089
Author(s):  
Zhancheng Wang ◽  
Huiyong Du ◽  
Ke Li ◽  
Jiaxuan Miao ◽  
Min Li ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Conversion Efficiency ◽  
Experimental Research ◽  
Distribution Characteristics ◽  
Scr Catalyst ◽  
Nox Conversion ◽  
Nox Conversion Efficiency

TWC-SCR Aftertreatment System Evaluation for a Lean Burn Gasoline Engine Operating in HCCI, SACI, and SI Combustion Modes

2016 ◽  
Author(s):  
Jordan Easter ◽  
Stanislav V. Bohac
Keyword(s):  
Conversion Efficiency ◽  
Gasoline Engine ◽  
Fuel Efficiency ◽  
Compression Ignition ◽  
Scr Catalyst ◽  
Advanced Combustion ◽  
Nox Conversion ◽  
Combustion Modes ◽  
Scr System ◽  
Nox Conversion Efficiency

Low temperature and dilute Homogenous Charge Compression Ignition (HCCI) and Spark Assisted Compression Ignition (SACI) can improve fuel economy and reduce engine-out NOx emissions to very low values, often less than 30 ppm. However, these combustion modes are unable to achieve stringent future regulations such as SULEV 30 without the use of lean aftertreatment. Though active selective catalytic reduction (SCR) with urea injection and lean NOx traps (LNT) have been investigated as options for lean gasoline engines, a passive TWC-SCR system is investigated in this work because it avoids the urea storage and dosing hardware of a urea SCR system, and the high precious metal cost of an LNT. The TWC-SCR concept uses periodic rich operation to produce NH3 over a TWC to be stored on an SCR catalyst for subsequent NOx conversion during lean operation. In this work a laboratory study was performed with a modified 2.0 L gasoline engine that was cycled between lean HCCI and rich SACI operation, or between lean and rich SI (spark ignited) combustion, to evaluate NOx conversion and reduced fuel consumption. Different lambda values during rich operation and different times held in rich operation were investigated. Results are compared to a baseline case in which the engine is always operated at stoichiometric conditions. SCR system simulations are also presented that compare system performance for different levels of stored NH3. With the configuration used in this study, lean/rich HCCI/SACI operation showed a maximum NOx conversion efficiency of 10%, while lean/rich SI operation showed a maximum NOx conversion efficiency of 60%. However, if the low conversion efficiency of lean/rich HCCI/SACI operation could be improved through higher brick temperatures or additional SCR bricks, simulation results indicate TWC-SCR aftertreatment has the potential to provide near-zero SCR-out NOx concentration and increased system fuel efficiency. In these simulations, fuel efficiency improvement relative to stoichiometric SI were 7 to15% for lean/rich HCCI/SACI with zero tailpipe NOx and −1 to 5% for lean/rich SI with zero tailpipe NOx emissions. Although previous work indicated increased time for NH3 to start forming over the TWC during rich operation, less NH3 production over the TWC per fuel amount, and increased NH3 slip over the SCR catalyst for advanced combustion systems, if NOx conversion efficiency could be enhanced, improvements in fuel economy and low engine-out NOx from advanced combustion modes would more than make up for these disadvantages.

Thermoeconomic multi-objective optimization of an organic Rankine cycle for exhaust waste heat recovery of a diesel engine

Energy ◽  
2015 ◽  
Vol 93 ◽  
pp. 2208-2228 ◽  
Author(s):  
Fubin Yang ◽  
Hongguang Zhang ◽  
Songsong Song ◽  
Chen Bei ◽  
Hongjin Wang ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Multi Objective Optimization ◽  
Multi Objective ◽  
Exhaust Waste Heat

scholarly journals A Numerical Methodology for the Multi-objective Optimization of the DI Diesel Engine Combustion

2014 ◽  
Vol 45 ◽  
pp. 711-720 ◽  
Author(s):  
Marco Costa ◽  
Gian Marco Bianchi ◽  
Claudio Forte ◽  
Giulio Cazzoli
Keyword(s):  
Diesel Engine ◽  
Multi Objective Optimization ◽  
Multi Objective ◽  
Engine Combustion ◽  
Di Diesel Engine

Effect of Physical Parameters on DeNOx Conversion in Selective Catalytic Converter Used in Diesel Vehicles

2013 ◽  
Vol 376 ◽  
pp. 13-16
Author(s):  
A.P. Manoj Kumar ◽  
P. Mohanan
Keyword(s):  
Cell Density ◽  
Conversion Efficiency ◽  
Catalytic Converter ◽  
Frontal Area ◽  
Physical Parameters ◽  
Cell Geometry ◽  
Diesel Vehicles ◽  
Nox Conversion ◽  
Nox Conversion Efficiency ◽  
Denox Efficiency

The Urea SCR system is a promising approach to reduce NOx in order to meet stringent limits on Euro 1V and Euro V standards. Apart from thermodynamic properties (temperature, pressure,heat and mass transfer), the cell geometry of SCR also got significant role in reduction of NOx. The current study focuses on the calculation of NOx conversion by varying the Open Frontal area of monolith, volume of monolith, cell density thereby to choose best cell geometry which will result in maximum DeNOx efficiency. It has been found that as the cell density increases the NOx conversion efficiency also increases. In the current analysis, a cell density varying from 200 CPSI to 400 CPSI is considered. One dimensional steady state and transient kinetic analysis are carried out using AVL BOOST software. The monolith volume is varied from 0.002m3 to 0.008m3 and the effects on DeNOx efficiency are discussed. The Open frontal area of SCR catalyst also been varied, and the effects on NOx conversion is studied. It has been found that as the cell density, monolith volume increases, the NOx conversion efficiency also increases, where as it decreases with increase in Open frontal area. The results are validated through experimental results obtained from the literature.

Sign in / Sign up

Export Citation Format

Share Document