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Full-Text Articles in Mechanical Engineering
Reduction Of Nox Emissions In A Single Cylinder Diesel Engine Using Sncr With In-Cylinder Injection Of Aqueous Urea, Anthony Timpanaro
Reduction Of Nox Emissions In A Single Cylinder Diesel Engine Using Sncr With In-Cylinder Injection Of Aqueous Urea, Anthony Timpanaro
UNF Graduate Theses and Dissertations
The subject of this study is the effect of in-cylinder selective non-catalytic reduction (SNCR) of NOx emissions in diesel exhaust gas by means of direct injection of aqueous urea ((NH2)2CO) into the combustion chamber. A single cylinder diesel test engine was modified to accept an electronically controlled secondary common rail injection system to deliver the aqueous urea directly into the cylinder during engine operation.
Direct in-cylinder injection was chosen in order to ensure precise delivery of the reducing agent without the risk of any premature reactions taking place. Unlike direct in-cylinder injection of neat water, …
NoX Formation In Light-Hydrocarbon, Premixed Flames, Robert T. Hughes
NoX Formation In Light-Hydrocarbon, Premixed Flames, Robert T. Hughes
Theses and Dissertations--Mechanical Engineering
This study explores the reactions and related species of NOx pollutants in methane flames in order to understand their production and consumption during the combustion process. To do this, several analytical simulations were run to explore the behavior of nitrogen species in the pre-flame, post- flame, and reaction layer regions. The results were then analyzed in order to identify all "steady-state" species in the flame as well as the determine all the unnecessary reactions and species that are not required to meet a defined accuracy. The reductions were then applied and proven to be viable.
Applied Control Strategies At A Cogeneration Plant, Joseph William Burns
Applied Control Strategies At A Cogeneration Plant, Joseph William Burns
Master's Theses
The purpose of this paper is to demonstrate the effectiveness of “classical strategies for dynamic control” on authentic cogeneration processes. These strategies are applied to several processes at the University of Connecticut’s cogeneration plant. Case studies of their applications are presented in this paper. Strategies that are applied include the following:
1) The classical SISO feedback structure
2) The First Order Plus Dead Time (FOPDT) process model
3) The Internal Model Control (IMC) correlations for PI controller tuning
4) Static feed forward with feedback trim
5) Cascade Control