Date of Graduation


Document Type


Degree Type



Statler College of Engineering and Mineral Resources


Mechanical and Aerospace Engineering

Committee Chair

Nigel Clark

Committee Co-Chair

Gregory Thompson

Committee Member

W. Scott Wayne


Increasingly stringent oxides of nitrogen (NOX) emissions regulations for diesel marine engines are resulting in the development of newer engines with inherent NOX emissions reduction technologies. With typical useful service lives over 20 years, older diesel marine engines are producing disproportionate amounts of NOX emissions when compared with their newer counterparts. The development of retrofit exhaust aftertreatment technologies would therefore aid in reducing the total NOX emissions from these engines.;A marine scrubber system for the reduction of NOX emissions from diesel marine engines was designed, constructed, and evaluated. This work focused on gathering data for the design of a marine scrubber system specifically for use with marine harbor craft. The operation of the marine scrubber system was based on and designed using NOX absorption theory. The system consisted of a continuously regenerating diesel particulate filter and diesel oxidation catalyst for oxidation of nitric oxide to nitrogen dioxide, a heat exchanger for exhaust gas temperature reduction, a scrubber unit for NOX gas absorption, and a liquor pump for liquor recirculation.;The system was tested with a 1992 Mack E7 engine over two test cycles, a High Flow cycle and Low Flow cycle. The High Flow cycle was used to represent marine harbor craft operation. Over this cycle the system was able to reduce engine NOX emissions by an average of 41.2%. The Low Flow cycle was developed to investigate the operating parameters of the scrubber unit. Over the Low Flow cycle the system was able to reduce engine NOX emissions by an average of 59.9%. The collection of data from this system facilitated parameter estimation and therefore future optimization of marine scrubber system design and control decisions.