Improving the operating modes of the exhaust gas recirculation system of marine diesel engines
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Abstract
Exhaust gas recirculation methods are considered as one of the most common methods that contribute to the reduction of nitrogen oxide emissions from marine diesel engines. It is determined that exhaust gas recirculation systems are technological solutions that ensure compliance with the requirements of Annex VI of MARPOL, in particular, compliance with the Tier III level for the concentration of nitrogen oxides in exhaust gases. The results of experimental studies performed on a MAN-Diesel 5G70ME-C10 marine diesel engine equipped with an exhaust gas recirculation system are presented. In order to improve the process of reducing nitrogen oxide emissions in the recirculation system, additional humidification of exhaust gases returning to the diesel cylinders was used. The studies were performed in the range of diesel engine operating loads of 60-90 % of nominal power and under the condition of 5-25 % of the exhaust gas recirculation degree. The studies were carried out in areas of special environmental control, which are subject to the requirements of Tier III MARPOL regarding the concentration of nitrogen oxides in exhaust gases. It was experimentally established that when using the recirculation system without additional humidification of exhaust gases, the emission of nitrogen oxides is reduced to values of 1,75-3,28 g/(kW⋅h). Additional humidification of exhaust gases contributes to the improvement of the environmental performance of the diesel engine, which is manifested in the reduction of nitrogen oxide emissions to values of 1,63-3,12 g/(kW⋅h). In both cases, the values obtained do not exceed the maximum possible value of 3,4 g/(kW⋅h), which meets the requirements of Tier III MARPOL. It is proposed to evaluate the efficiency of the operating modes of the recirculation system (for both cases – without and with additional humidification of exhaust gases) by environmental stability in terms of nitrogen oxide emissions. This indicator is 38,53-48,53 % in the case of operation of the recirculation system without additional humidification of exhaust gases and 43,53-52,06 % in the case of operation of the recirculation system with additional humidification of exhaust gases.
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