Effect of Sampling Positions along Exhaust Pipe on PM Measurement

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  • Ohashi Atsuto
    国立研究開発法人 海上・港湾・航空技術研究所海上技術安全研究所 環境・動力系
  • Nakamura Mayuko
    国立研究開発法人 海上・港湾・航空技術研究所海上技術安全研究所 環境・動力系

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Other Title
  • PM計測における排気採取位置の影響
  • PM ケイソク ニ オケル ハイキ サイシュ イチ ノ エイキョウ

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Description

<p>In order to study the effect of sampling positions along an exhaust pipe on PM measurement, we measured PM emitted from a medium speed 4-stroke marine diesel engine. The marine diesel engine was operated at steady state using low sulfur marine diesel oil for PM measurement. Two partial flow dilution systems were used to measure PM emitted from the engine. First of all, in order to check the equivalence of the two partial flow dilution systems, they had the almost same sampling positions on the exhaust pipe of the engine. Since PM emission levels can change slightly even during steady state operation of the engine, it was necessary to perform simultaneous PM measurement in order to compare the results from the two partial flow dilution systems with high accuracy. It was confirmed through this statistical process that the two systems have equivalent performance. Then PM was measured simultaneously after the sampling position of one of the two systems was moved approximately 12 meters on the exhaust pipe. It was found that the emission levels from the downstream system were two to four percent lower than those from the upstream system, and that the results from the two systems were well-matched. We believe that when the engine operates steadily, it is possible to select sampling positions within the distance described in this report. </p>

Journal

  • Marine Engineering

    Marine Engineering 54 (4), 644-649, 2019-07-01

    The Japan Institute of Marine Engineering

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