【作者】

Robert Bank

【摘要】

该论文已在赫尔辛基举行的第28届CIMAC大会上发表，论文的版权归CIMAC所有。ABSTRACT Next to the limitation of NOx emissions the SOx emissions are limited, too. The threshold for SOx can be achieved by reducing the sulfur content of the used fuel or by an aftertreatment of the exhaust gas. The financial advantage of exhaust gas scrubbing lies in the continued operation on sulfur containing fuel. Scrubber systems are suitable and well known for an efficient reduction of the SOx emissions. Nevertheless different scrubber technologies exist. One possible approach is the dry scrubber technology. Here the exhaust gas is conducted to a cascaded reactor requiring a temperature of 200 to 350°C depending on the application. The reactor is containing an absorbent material which is binding the SOx emissions by physical and chemical processes. The used absorbent is discharged in intervals and replaced by fresh material. Currently, significant improvements of the absorbent materials for dry scrubbing are focus of several research and development programs. An improved absorptive capacity allows a reduction in granule consumption and therefor a size and weight reduction of reactors and consumable bunkers. Furthermore several new materials for significantly reduced operation temperatures are under development. These materials are designed for operating conditions and exhaust gas temperatures of large bore two stroke engines or medium speed four stroke engines. Within this article the basic physical and chemical principles of the dry scrubber technology are presented. This includes a brief comparison with wet scrubber technology and the identification of important advantages of the dry scrubbing. The slightly exothermal chemical reactions of SOx with the granules of the absorbent material allow an exhaust gas cleaning without cooling down the exhaust gas. This has important advantages regarding package solutions in combining desulfurization and denitrification concepts. The denitrification unit, e.g. an ammonia SCR system, can be positioned downstream the scrubber system. The exhaust gas temperature remains high enough for SCR reactions. Furthermore the SOx components are removed from the exhaust gas and therefore the risk of ammonia sulfate formation, which may lead to a blocking of the SCR catalyst, is minimized. Next to the theoretical aspects the paper will contain experimental results. Using a scaled reactor on an engine test bench the potential of the developed absorbent materials was examined. The results of these experimental investigations and the conclusions for a safe and efficient desulfurization of the exhaust gas will be presented.

【会议名称】

第28届CIMAC会议

【会议地点】

芬兰 赫尔辛基

【下载次数】

3

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