1.5톤 선박용 보일러의 SCR 시스템 수치해석에 관한 연구

Abstract

Diesel engines are widely used as transportation engines because for their superior torque and thermal efficiency compared to gasoline engines. In shipping companies, low-grade diesel oil is used to reduce fuel costs, but diesel engines emit up to 100 times more Nitrogen Oxides(NOx) and fine dust than gasoline engines. Currently, global warming and climate change are increasing interest in the air environment, and regulations on air pollution emissions are being strengthened. The International Maritime Organization has applied the Tier III, a nitrogen oxide emission regulation in the ECA area, to vessels built since 2016 and regulations are being strengthened on environmental pollution sources emitted from ships operating in the ocean and docking in ports. There are methods such as EGR and SCR systems to cope with enhanced environmental regulations. EGR reduces the amount of oxygen and increases the concentration of carbon dioxide as a way to reduce NOx emissions during engine combustion, slowing the combustion reaction and lowering the maximum combustion temperature. Previous studies on the comparison of nitrogen oxide reduction rates by boiler load using diesel fuel and LNG fuel have not been conducted in detail. In this study, the nitrogen oxide reduction rate and flow characteristics were investigated through CFD flow analysis according to the boiler load of the SCR system using diesel fuel and LNG fuel using a 1.5 ton marine boiler. In the future, trough the results of numerical analysis, we will develop an efficient LNG propulsion ship SCR system based on comparative analysis with actual experimental values.