NOx is one of the major pollutants present in the exhaust gas of marine diesel engines. Normally, NOx is difficult to remove using scrubbers because NO, which accounts for 90 % of NOx, has very low water solubility. However, if NO is oxidized to other highly soluble nitrogen oxides, the removal efficiency of NOx in a wet scrubber can be greatly improved. In this study, we estimated the efficiency of NOx removal from the exhaust gas of a 50 MW diesel engine using H2O2 solution. Then, we compared the results with the removal efficiency of a conventional exhaust gas recirculation (EGR) system. The amount of H2O2 consumption varied from 0 to 760.30 kg/h to satisfy emission regulations, depending on the amount of NOx input in the scrubber. In this study, we conducted an economic evaluation of the operation costs of NOx removal using H2O2, considering other parameters affecting the operation cost and by comparing the results with that of the conventional EGR system. The results of the economic evaluation show that the use of EGR in ECAs was 2.307 M$/y, which is more economical than that of H2O2, and the use of H2O2 in non-ECAs was 1.044 M$/y, more economical than that of EGR. If the ECA ratio is less than 31.5%, the operation cost of using H2O2 is lower than using EGR.
|Title of host publication||Computer Aided Chemical Engineering|
|Editors||Anton Friedl, Jiří J. Klemeš, Stefan Radl, Petar S. Varbanov, Thomas Wallek|
|Number of pages||6|
|Publication status||Published - 2018 Jan 1|
|Name||Computer Aided Chemical Engineering|
Bibliographical notePublisher Copyright:
© 2018 Elsevier B.V.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Computer Science Applications