Abstract
NOx from marine diesel engines does great damage to the ocean and to human health. In this study, the O3-Na2SO3 absorption system was used to investigate NOx removal from simulated marine exhaust gases. The independent effects of Na2SO3 concentration, initial pH values, temperature, and O3 concentration were thoroughly discussed. The results showed that increasing the Na2SO3 and O3 concentrations contributed to increasing NOx removal efficiency. However, the NOx removal efficiency increased with the decrease of the initial pH values. In addition, the response surface methodology was used to estimate the relevance of the four parameters and their dependent effects on NOx removal efficiency. According to the fitted quadratic regression model, the significance levels of the related terms were analyzed. Moreover, the interactive effects of the experimental parameters and the optimal conditions on maximum NOx removal efficiency were obtained by the response surfaces and the quadratic regression model. The maximum NOx removal efficiency predicted by the model was 99.08% and the prediction showed excellent agreement with experimental results.
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