Research on driving conditions and emission characteristics of offshore fishing boats

Using the portable emission measurement system, the real-world emission test of typical operating conditions was carried out on six representative offshore fishing vessels in the Beihai area of Guangxi. The operating conditions have a similar effect on the emission factors of CO, THC, and PM: the emission factor under the entry and exit conditions far exceeds the emission factor of the cruise. For example, when fishing boat two (256kW) departs from the port, the emission factors of CO, THC, and PM are 14 times, 11.6 times, and 4.3 times those of cruise condition, while the emission factors of CO, THC and PM are only 1.1 times, 1.4 times and 1.55 times those of the cruise condition when the fishing vessel six (2190kW) enters the port. The smaller the ship power is, the more obvious the difference is; the effect of operating conditions on NOX and CO2 is small. The average emission factor of each component based on fuel consumption of small and medium-sized marine fishing vessels is much higher than that of large ships. The service life of the engine also has an important impact on the emission factor. The longer the service life of the ship, the greater the emission factor of each component.