A feasibility Study on the exhaust-gas treatment efficiency of a wet-scrubber system equipped in a diesel engine: A focus on smoke emission

Abstract

A feasibility examination was conducted on a wet-scrubber system designed in this study to investigate the exhaust gas treatment efficiency of a wet-scrubber system equipped with a diesel engine. This preliminary investigation limits to evaluate the feasibility of the wet scrubber system in decreasing smoke. The influence of multiphase flow configuration in wet-scrubbing aftertreatment systems on emission formation is an interesting topic in the field of exhaust gas aftertreatment. It is our initial attempt to investigate the influence of multiphase flow configuration in a wet-scrubbing hybrid aftertreatment system on key pollutants emitted from Diesel engines in the future. This wet scrubber works by spraying water into the exhaust gas stream. The engine was tested at three-speed conditions (1,500 rpm, 1,800 rpm, and 2,000 rpm, respectively) while varying its torque from 15 to 30 N.m. The results show that under these operating conditions, the smoke level after the scrubber decreases by up to 50%. Please note that only fresh water was used in this study, and the impact of catalysts that could further decrease exhaust gas pollution will be investigated in future studies. The water droplets serve as a medium for capturing and collecting the soot particles present in the exhaust gas. Through collisions, the water droplets cause the soot particles to adhere to their surfaces, a process known as impaction. Additionally, the larger water droplets can facilitate coagulation or agglomeration of the particles, resulting in their enlargement and enhanced capture efficiency.