【作者】

Jinhee Koo

【摘要】

该论文已在芬兰赫尔辛基举行的第28届CIMAC大会上发表。论文的版权归CIMAC所有。To comply with IMO Tier III, nitrogen oxides from engine shall be reduced about 80% compare to current IMO Tier I in emission control area. One of the most promising approaches to achieve substantial NOx reduction performance in marine application is SCR by using vanadium-based catalysts due to their relative insensitivity to sulfur in fuel with high NOx conversion. The SCR catalysts including substrate should be selected after considering condition of the marine application such as property of fuel, installation condition and operating condition. In case of the 4-stroke medium speed engines, typically allowed backpressure of SCR system is 10 to 15 mbar. Under such condition, the SCR catalysts have to be designed significantly low backpressure, whereas installation is under space constraints in vessel. Other requirements are sufficient mechanical strength and resistance against vibration from engine itself and complex vibration from ship. In addition, since the most of marine engines are operated in low load and used low quality fuel, catalysts are exposed to the exhaust gas including high dust and sulfur. Therefore catalysts also shall be designed to keep good performance in low temperature and durability against high dust and sulfur. Taking these into account, in this paper, we introduce new developed SCR catalyst which called WIW (Washcoat-In-the Wall) catalyst and compare with other types of catalysts which are commercially available for diesel engine application. Coated SCR catalyst on metal substrates and homogeneously extruded catalyst are used for comparing with WIW catalyst. These catalysts are analyzed the performance such as mechanical strength, ammonia storage capacity and NOx conversion rate depending on temperature by using the micro reactor in laboratory. And these catalysts are verified the NOx conversion rate, influence of differential pressure by particle matter and noise reduction in STX-SCR system with 2MW marine diesel engine. Additionally, to investigate durability and regeneration for SOF and ABS, WIW catalyst was subjected to aging cycle with high sulfur emission gas. The WIW catalyst has enough mechanical strength, NOx conversion performance and durability to apply to marine application. Accordingly, it has acquired Tier III confirmation classification society for STX-SCR system using WIW catalyst on 2MW marine diesel engine.

【会议名称】

第28届CIMAC会议

【会议地点】

芬兰 赫尔辛基

【下载次数】

2

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