Abstract
The experiments were performed in a lab-scale countercurrent spraying reactor to study the NOxremoval from simulated gas stream by cyclic scrubbing using NaClO solution. The effects of NaClO concentration, initial solution pH, coexisting gases (5% CO2and 13% O2), NOxconcentration, SO2concentration, and absorbent temperature on NOxremoval efficiency were investigated in regard to marine exhaust gas. When NaClO concentration was higher than 0.05 M and initial solution pH was below 8, NOxremoval efficiency was relatively stable and it was higher than 60%. The coexisting CO2(5%) had little effect on NOxremoval efficiency, but the outlet CO2concentration decreased slowly with the initial pH increasing from 6 to 8. A complete removal of SO2and NO could be achieved simultaneously at 293 K, initial pH of 6, and NaClO concentration of 0.05 M, while the outlet NO2concentration increased slightly with the increase of inlet SO2concentration. NOxremoval efficiency increased slightly with the increase of absorbent temperature. The relevant reaction mechanisms for the oxidation and absorption of NO with NaClO were also discussed. The results indicated that it was of great potential for NOxremoval from marine exhaust gas by wet scrubbing using NaClO solution.
Highlights
The exhaust gas emitted from marine diesel engines contains a large number of atmospheric pollutants, such as sulphur oxides (SOx), nitrogen oxides (NOx), and particulate matters (PMs), which has caused serious damage to the ecological environment [1]
NOx removal by wet scrubbing using NaClO solution was studied based on a spraying reactor in a cyclic mode
The results showed that when NaClO concentration was higher than 0.05 M and initial solution pH was below 8, NOx removal efficiency was relatively stable, which was higher than 60%
Summary
The exhaust gas emitted from marine diesel engines contains a large number of atmospheric pollutants, such as sulphur oxides (SOx), nitrogen oxides (NOx), and particulate matters (PMs), which has caused serious damage to the ecological environment [1]. An alternative way is to install an exhaust gas cleaning system (EGCS) on board to achieve the abatement of SOx emission equivalently It is very difficult for SOx scrubbers to remove NOx effectively at the same time. The combustion control techniques include exhaust gas recirculation (EGR) [2], fuelwater emulsion (FWE) [3], and direct water injection (DWI) [4]. They aim at reducing the formation of NOx during the combustion process, but it will result in the decrease of total heat efficiency. The effect of coexisting gases on NOx removal efficiency had been studied preliminarily, and the relevant reaction mechanism was discussed
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