International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 09 | Sep 2024
p-ISSN: 2395-0072
www.irjet.net
ADVANCED SELECTIVE CATALYTIC REDUCTION TECHNOLOGY (ASCRT) FOR NOx EMISSION CONTROL IN AUTOMOTIVE ENGINES Pazhanibharathi K1, Pandiyan A2, A C Mariappan3, G Peter Packiaraj4 1,2 Final Year B.E Marine Cadets, PSN CET, Tirunelveli, Tamil Nadu
3,4 Assistant Professor, Department of Marine Engineering, PSN CET, Tirunelveli, Tamil Nadu
------------------------------------------------------------------------***----------------------------------------------------------------------ABSTRACT 2. HOW TO PRODUCE NOX EMMISSION FROM MARINE DIESEL ENGINE Selective Catalytic Reduction (SCR) technology is a widely adopted method for reducing nitrogen oxides (nox) emissions from diesel engines, essential for meeting stringent environmental regulations. This paper reviews recent advancements in SCR systems, focusing on improvements in catalyst materials, urea-based reductions, and integration. System It discusses the evolution of SCR technology from its early implementations to current state of-the-art systems, highlighting key innovations such as high efficiency catalysts and optimized dosing strategies. The paper also addresses challenges related to catalyst deactivation, temperature management, and integration with engine control systems. Through experimental data and real-world applications, the study demonstrates the effectiveness of modern SCR systems in achieving substantial nox reduction and explores future directions for enhancing performance and reliability.
High Combustion Temperatures: nox forms when temperatures exceed 1,500°C (2,732°F) in the combustion chamber. This is because at such high temperatures, nitrogen (N2) and oxygen (O2) in the air react to form nox compounds. Lean Air Fuel Mixture: Engines running with a lean air-fuel mixture (more air than fuel) tend to produce more nox this is because lean mixtures burn hotter and at higher temperatures compared to richer mixtures. High Engine Load and RPM: Operating an engine at high loads and high revolutions per minute (RPM) generally results in higher combustion temperatures, which can increase nox emissions. Advanced ignition timing (igniting the fuel-air mixture earlier) can also lead to higher combustion temperatures, contributing to increased NOx production.
Key words: ASCRT, Selective Catalytic AdBlue, IMO, DEF. 1.INTRODUCTION Selective Catalytic Reduction (SCR) is a system used in marine engines to reduce nitrogen oxide (NOX) emissions. Here’s a brief overview of how it works and its benefits SCR systems inject a reducing agent, usually urea (AdBlue), into the exhaust gases of the engine. This agent reacts with nox in the presence of a catalyst to convert it into harmless nitrogen and water. SCR catalysts is a coated ceramic or metallic substrate that facilitates the chemical reaction. Urea Injection System: This system includes a tank for storing urea and a dosing unit for injecting it into the exhaust stream.
3.SELECTIVE CATALYTIC REDUCTION
Manages the operation of the urea injection and monitors the SCR system's performance. Reduced nox Emissions: SCR can lower nox emissions by up to 90%, helping ships meet stringent environmental regulations Compliance Helps vessels comply with IMO Tier III emission standards and other regional regulations.
The catalytic converter contains a catalyst that reacts with NOx in the engine exhaust to convert it into nitrogen and water vapor. Nitrogen-based solutions (typically called diesel-based fluids or DEF) are used in injection system engineering prior to entry into prototyping. DEF reacts with NOx in the exhaust to form nitrogen and water vapor.
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Fig. 1 SCR PROCESS
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