【作者】

Hidetsugu Sasaki

【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 The harmful exhaust gas emissions from marine diesel engines are NOx, SOx, and particulate matter. For NOx and SOx, the IMO Tier II regulation went into effect in January 2011, and the regulation is strengthened in the Tier III. On the other hand, for particulate matter, an action to reduce the sulfur content of fuel oil is adopted for the nonce. In recent years, there is a problem of global warming and rising sea levels. Marine diesel engines are strongly reduce particulate matter containing black carbon particularly in the high-latitude region. Given this situation, it is important to understand the characteristics of particulate emission from marine diesel engines and the influences of differences in measurement conditions. In this paper, particle size distribution and mass concentration of particulate matter from marine diesel engines were measured with 2 types of marine diesel engine, such as, high speed four-stroke engine (3L13AHS, 73.55 kW) and low speed two-stroke engine (3UEC33LSII-Eco, 1,275 kW). Furthermore, particle size distribution was measured by a hot-dilution method and a cooled dilution method. In the hot-dilution method, exhaust gas from the engine is diluted with high temperature air. Two types of marine diesel fuel, low sulfur fuel with a sulfur content of 0.089 %, and high sulfur fuel with a sulfur content of 0.73 % were used for the tests. Mass concentration of particulate matter was measured with the dilution tunnel system (compliant ISO8178-1), and divided into SOF (Soluble organic fraction) and ISF (Insoluble organic fraction) by Soxhlet extraction method, and PM particle size distribution was measured with the Scanning mobility particle sizer (SMPS) and Electric low pressure impactor (ELPI). The effects of the dilution ratio and the dilution air temperature in the dilution tunnel on particle size distribution and mass concentration of particulate matter were examined. The results of this experiment are as follows: (1) In the measurement by SMPS, the mode diameters of particle size of particulate matter from the marine diesel engines are below 100 nm for all experimental conditions. (2) Comparison of particulate size distributions by the hot dilution method and the cooled dilution method shows that a nucleation mode of volatility component within the particulate matter in the dilution tunnel is generated clearly. (3) For the two-stroke diesel engine, the mode diameter of particulate size become larger at high engine load condition, and this fact suggests that Brownian coagulation particulate matter has occurred. (4) In the measurement by ELPI, the particulate size distribution shows bimodal distribution under the weight concentration analysis. (5) The number concentration of particles of particulate matter from four-stroke marine diesel engine is higher than that of from marine two-stroke diesel engine for the particle of less than 100 nm diameter.

【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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