Exhaust Gas Recirculation (EGR) effect on two-stroke diesel engines under sailing condition
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Selective catalytic reduction (SCR) is commonly employed to reduce NOx emissions and meet Tier III regulations for marine diesel engines. However, challenges arise when applying SCR to two-stroke diesel engines because the catalyst may not function effectively at lower exhaust gas temperatures. To address this issue, exhaust gas recirculation (EGR) has been introduced in two-stroke diesel engines, such as the T/S Baek-kyung, a Pukyong National University training ship. There are ecoEGR to improve fuel consumption. The T/S Baek-kyung is equipped with a controllable pitch propeller and uses a combinator mode for normal sailing, which differs from the operating conditions in the NOx technical files; therefore, data from actual operations are rare. Sailing data under various conditions (loads and EGR rates) were obtained and analyzed. A comparison of the Tier II and ecoEGR modes showed no significant difference in engine performance; however, there was a reduction in NOx and particulate matter with an increase in CO2. There was a significant difference in the performance at approximately 50% load owing to the influence of the combinator mode.
Abstract
Selective catalytic reduction (SCR) is commonly employed to reduce NOx emissions and meet Tier III regulations for marine diesel engines. However, challenges arise when applying SCR to two-stroke diesel engines because the catalyst may not function effectively at lower exhaust gas temperatures. To address this issue, exhaust gas recirculation (EGR) has been introduced in two-stroke diesel engines, such as the T/S Baek-kyung, a Pukyong National University training ship. There are ecoEGR to improve fuel consumption. The T/S Baek-kyung is equipped with a controllable pitch propeller and uses a combinator mode for normal sailing, which differs from the operating conditions in the NOx technical files; therefore, data from actual operations are rare. Sailing data under various conditions (loads and EGR rates) were obtained and analyzed. A comparison of the Tier II and ecoEGR modes showed no significant difference in engine performance; however, there was a reduction in NOx and particulate matter with an increase in CO2. There was a significant difference in the performance at approximately 50% load owing to the influence of the combinator mode.
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