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Browsing by Author "Ahmed, Omar Y"

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    Engine Combustion of Hydrogen Produced by Anaerobic Bacterial Wastewater Treatment
    (2017-08) Ahmed, Omar Y
    To reduce the economic and environmental costs of wastewater treatment, researchers are developing a novel treatment approach in which bacteria purify wastewater while producing hydrogen as a byproduct. To evaluate the feasibility of using this hydrogen for energy, a 1kW engine-generator was modified to combust hydrogen instead of gasoline. The engine was run at constant speeds of 5500, 5750, and 6000 RPM as its load increased, and intake and exhaust characteristics were measured. The engine emitted only water vapor and oxygen without harmful pollutants, but generated no more than .5 kW and ran at an equivalence ratio of no higher than .6 regardless of speed or hydrogen flowrate. Further characterization of hydrogen combustion in the engine is needed to improve power output.
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    Evaluating the Accuracy of a Portable NOx Sensor for Measuring Emissions from a Biomass Gasifier-Generator System
    (2016-08) Ahmed, Omar Y
    Biomass gasification is the process of partially oxidizing organic matter into hydrogen, carbon monoxide, and other gases that can be combusted in engines to generate electricity. The process emits nitrogen oxides (NOx gases) whose concentrations must be accurately measured. This project evaluated the accuracy of the portable Continental Smart NOx Sensor by comparing its readings to those of an external laboratory grade analyzer. The Continental sensor consistently read higher NOx concentrations than the analyzer, though it is unclear whether the sensor simply measured inaccurately or was affected by ammonia in the exhaust, as is known to be a potential issue with onboard NOx sensors. Because the ammonia content of the exhaust was not checked, the Continental sensor’s accuracy was ultimately not determined and more research is required.