【作者】

Petra Steffe,Kathrin Liepert,Richard Losher

【摘要】

论文已在上海2013年CIMAC大会上发表，论文版权归CIMAC所有。 In 2015/2016 stricter limits for marine engines concerning sulfur and nitrogen oxide emissions will come into force with IMO TIER ll.A NOx re-duction of approximately 75% compared with today is demanded as well as a desulfurization of over 85% in designated so-called emission controlled areas(ECA).In order to meet the upcoming emission limits, robust, reliable and efficient solutions must be developed. Be-sides the intensive development and test of selective catalytic reduction (SCR) technology to minimize NOx emissions, other emission reduction methods as desulfurisation are analysed and optimized in Augsburg. Focus of development activities hereby is besides the optimization of the single technologies to find the best possible combination of the solutions. A core competence is the proven MDT safety and control system SaCoSone, enlarged by aftertreatment modules of SaCoSone Up to now a wide experience is available on the various aftertreatment technology demonstrators. The most effort is placed in the field of SCR technology, which is the basic solution for reaching IMO TIER lII emission limits. With the valuable measuring results theoretical models have been adopted and validated, so that the prediction of relevant characteristic parameters is possible with a good accordance to the test results for the MDT engine family. With these models an optimization of the chosen technologies has been executed. Compared with the initial configuration, significant improvements have been achieved in the fields of catalyst type and size, reductive injection and mixing unit. A uniform distribution of the exhaust gas, mainly in velocity and composition as well as an improved thermolysis of the reductive to ammonia led to series modules with less installation space. Further potential is seen in the development of innovative concepts for ammonia generation. To be able to operate the aftertreatment technologies with minimized consumption of energy and reductive, the system control is executed with SaCoS, including the safety strategy of the complete system. An intelligent control unit which controls all relevant parameters as a function of the engine is furthermore important when switching between ECA and non-ECA mode. Besides the efforts to develop a high performance SCR system, some predefinitions from engine side have to be fulfilled. The composition of the raw emissions has a great influence on type of catalyst to be used, and boundary conditions concerning optimal temperatures have to be met. For a further reduction of particulate matter(PM) emissions and to eliminate the sulfur oxides, dry and wet scrubber technique is tested in-house as well as on field tests. The first step towards IMO TIER IlI compliant systems is the development of the single techniques. More benefits concerning in-vest and operation cost as well as reliability and performance are generated by smart combination of the subsystems. As example, when the desulfurization is placed in front of the SCR catalyst, a much better quality of the exhaust gas is entering the catalyst, with a lower risk of blocking, fouling or poisoning. Therefore the complete system can be further optimized regarding volume and weight. The paper summarizes the test results and challenges and concludes with an out-look to future developments.

【会议名称】

第27届CIMAC会议

【会议地点】

上海

【下载次数】

1

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