Abstract
An efficient NOx reduction aftertreatment technology for a marine diesel engine that combines nonthermal plasma (NTP) and NOx adsorption/desorption is investigated. The aftertreatment technology can also treat particulate matter using a diesel particulate filter and regenerate it via NTP-induced ozone. In this study, the NOx reduction energy efficiency is investigated. The investigated marine diesel engine generates 1 MW of output power at 100% engine load. NOx reduction is performed by repeating adsorption/desorption processes with NOx adsorbents and NOx reduction using NTP. Considering practical use, experiments are performed for a larger number of cycles compared with our previous study; the amount of adsorbent used is 80 kg. The relationship between the mass of desorbed NOx and the energy efficiency of NOx reduction via NTP is established. This aftertreatment has a high reduction efficiency of 71% via NTP and a high energy efficiency of 115 g(NO2)/kWh for a discharge power of 12.0 kW.
Highlights
The advantages of diesel engines are low CO2 emissions and high fuel efficiency with respect to the output power
An experiment using a marine diesel engine was conducted using an nonthermal plasma (NTP) generator with a power of 12.0 kW for a larger number of cycles compared with our previous study
The characteristics of NOx adsorption/desorption and the NOx reduction efficiencies were analyzed according to experimental data
Summary
The advantages of diesel engines are low CO2 emissions and high fuel efficiency with respect to the output power. Ships use diesel engines as propulsion and auxiliary engines because various types of fuels can be employed. Their emissions contain harmful particulate matter (PM) and NOx (NO + NO2 ). Exhaust purification requires aftertreatment technologies [1]. These technologies have been extensively studied and developed in recent years, e.g., in our previous studies [2,3]. Reduction of NOx from diesel emissions is difficult. Emissions requirements have become increasingly stringent in recent years. To reduce NOx emissions in O2 -rich environments, selective catalytic reduction (SCR)
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