Abstract NOx emission from diesel engine off-gases in marine transportation sector is still an environmental issue to be solved in present day. Electron beam (EB) followed by a seawater wet scrubber method to removal NOx has been experimentally studied (Chmielewski et al., 2018). In this work numerical simulation of NOx reduction using EB followed by a water scrubber system has been carried out. The first stage was to calculate NOx removal versus dose under EB irradiation. Computer code “KINETIC” and Gear method were used, the model has been improved based our previous work (Zwolinska E. et al., 2015) and verified by the experimental results. The calculation results of NOx removal efficiency was 4.9% at 10.9 kGy dose under EB irradiation, which was a little higher than experimental value (3.5%). Computer program MATLAB was used to study NOx absorption in water. The NOx removal efficiency was increased by 17.5% at 10.9 kGy dose for inlet concentration of NOx being 1333 ppm after EB-water absorption process. At the end, NOx reduction in the simulated marine off-gas using microwave plasma was simulated using computer program Chemical Workbench. Less than 20% NOx was removed from the off-gases in microwave plasma reactor even at 9000 kGy dose for the inlet concentration of NOx being 1500 ppm. EB is more energy efficient than microwave plasma for NOx removal.

中文翻译：

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电子束和湿式洗涤器系统下柴油机尾气中NOx去除的计算机模拟

摘要 海洋运输领域柴油机尾气NOx排放仍是当今亟待解决的环境问题。已经对电子束 (EB) 和海水湿式洗涤器方法去除 NOx 进行了实验研究（Chmielewski 等人，2018 年）。在这项工作中，使用 EB 和水洗涤器系统对 NOx 还原进行了数值模拟。第一阶段是计算 EB 照射下 NOx 去除与剂量的关系。使用计算机代码“KINETIC”和Gear方法，该模型已经基于我们之前的工作（Zwolinska E. et al., 2015）进行了改进，并通过实验结果进行了验证。EB辐照10.9 kGy剂量下NOx去除效率的计算结果为4.9%，略高于实验值（3.5%）。计算机程序MATLAB用于研究水中的NOx吸收。EB-吸水过程后NOx入口浓度为1333 ppm，在10.9 kGy剂量下，NOx去除效率提高了17.5%。最后，使用计算机程序 Chemical Workbench 模拟了使用微波等离子体的模拟海洋废气中的 NOx 还原。即使在 9000 kGy 剂量下，当 NOx 的入口浓度为 1500 ppm 时，从微波等离子体反应器的废气中去除的 NOx 也少于 20%。EB 在去除 NOx 方面比微波等离子体更节能。使用计算机程序 Chemical Workbench 模拟使用微波等离子体在模拟海洋废气中的 NOx 还原。即使在 9000 kGy 剂量下，当 NOx 的入口浓度为 1500 ppm 时，从微波等离子体反应器中的废气中去除了不到 20% 的 NOx。EB 在去除 NOx 方面比微波等离子体更节能。使用计算机程序 Chemical Workbench 模拟使用微波等离子体在模拟海洋废气中的 NOx 还原。即使在 9000 kGy 剂量下，当 NOx 的入口浓度为 1500 ppm 时，从微波等离子体反应器中的废气中去除了不到 20% 的 NOx。EB 在去除 NOx 方面比微波等离子体更节能。