【作者】

Niko Soikkeli,Marko Lehikoinen,Kaj-Olof Ronnback

【摘要】

论文已在上海2013年CIMAC大会上发表，论文版权归CIMAC所有。 The objective of the article is to present critical design aspects of SCR systems suited for high sulphur fuels in combination with exhaust gas boilers, silencers and scrubber. The combination is presented by going through the challenges of the general system design. Regarding the challenges the main focus of the paper is in SCR operation when using high sulphur heavy fuel oil. The message is that by designing the exhaust gas treatment combination effectively it is possible to meet IMO ECA requirements for NOx and SOx emissions in the future while utilising the whole exhaust gas system design also e.g. for noise attenuation. The intension is to explain the most important phenomena influencing on the design and by what terms the different exhaust gas equipment affect each other and the engine itself. The main focus of the article is on SCR operational requirements. Therefore the paper will review the exhaust gas temperature window requirements for SCR and will explain facts behind the recommended temperature limits. The paper will present how the SCR design is effectively implemented to high sulphur heavy fuel oil operation by optimised catalyst design and improved catalyst cleaning system and by following the temperature requirements. In some engines there is a certain need to control the temperature after the turbocharger during the operation with high sulphur HFO and SCR. The need for control also applies to applications which have significantly low engine intake air temperature. The most suitable way to carry out the temperature control strongly depends on the operation profile of the engine and SCR and if the SCR is operated only on certain sailing areas or continuously. Aspects of the combined engine and SCR design are reviewed in general level. The paper also reviews the whole exhaust gas line. Temperature changes, back pressures, and noise attenuation features of the different equipments are discussed. Back pressure of the whole exhaust gas line can be optimised by sufficient dimensioning and combination of the equipments. Sound attenuation features of the combination of integrated mixing duct silencer, SCR reactor, boiler and Wartsila CSS(Compact Silencer System) elements are discussed. This combination can be designed to meet various sound attenuation requirements. Space restrictions are well recognised concern for many ship owners, ship operators and shipyards. The needed performance of the exhaust gas line after turbocharger plays a significant role in the design of the ship. The paper presents the typical sizes of different equipments and the feasible ways to minimise the needed space for the whole exhaust gas line.

【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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