Experiment and Prediction Studies of Marine Exhaust Gas SO2 and Particle Removal Based on NaOH Solution with a U-Type Scrubber

Abstract

Marine diesel engines produce exhaust gas including a lot of SOx and particulate matter (PM), and laws have been promulgated to regulate ship exhaust emissions. This paper proposes a U-type exhaust gas cleaning (EGC) system that is capable of removing SO2 and particulate matter (PM) simultaneously. The purpose of this study was to find the relationships between removing efficiency and parameters of EGC system, then get the optimal structural and operational parameters. The experimental results show that the SO2 absorption rate in the scrubber was mainly influenced by liquid–gas ratio, pH value, and temperature in the range of experimental operating conditions. With the system stable running, when the liquid–gas ratio and temperature were determined, the pH value must be in a fixed range of 6.5–7.5. The further research was also carried on for the EGC system applicable to ships. On the basis of SO2 removal efficiency, the prediction and experimental validation of particulate matter (PM) were studied. When ...