Thousands of older diesel engines are in operation worldwide in applications ranging from emergency generators to workboats. They are significant contributors to air pollution in cities and industrial areas. What is the solution for achieving greater emission control on these engines today? Are immediate cost effective solutions available in the market? Can these engines be retrofitted with up-to-date emission control equipment? A project was funded by TCEQ (Texas Commission on Environmental Quality) to answer these questions. Within this project a diesel exhaust gas treatment system has been developed and tested to reduce pollutants from older diesel engines and to improve air quality in Houston Harbor. The key objective of the funded project - develop and demonstrate a marine retrofit system - has been accomplished. Below is a summary of the technical findings and conclusions: The cost effective retrofit aftertreatment system is a solution for achieving current emission standards: EPA Tier 4 final, which is based on proven heavy duty components. It was demonstrated on a test bench engine reducing emissions from Tier 1 to Tier 4 final and with a similar engine on a tugboat reducing emissions from Tier 2 to Tier 4 final. No engine controller is required due to the implementation of external retrofit sensors, which are used to calculate the exhaust mass flow in the dosing controller. Portable emission measurement testing was accomplished for baseline testing and system calibration on vessel. Simulation tools are used to predict the system behavior and to design a robust system for a wide range of marine applications. NO2 based filter regulation can be achieved based on a typical tugboat driving cycle. Ultra low sulfur diesel fuel is required. The SCR conversion rate for ISO 8178 E3 are over 86 %, whereas the NOx reduction over the selected driving cycle is about 80 %. Higher conversion rates can be achieved by using larger dosing modules and an improved mixing pipe.
Development of a highly efficient retrofit aftertreatment system for marine applications
2013
15 Seiten, 21 Bilder, 4 Quellen
Conference paper
Storage medium
English
Development of a highly efficient retrofit aftertreatment system for marine applications
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