Black carbon emission characteristics of a low-speed two-stroke marine engine fueled with various fuels
In order to investigate the black carbon emission characteristics of marine diesel engines fueled with differ-ent fuels,steady-state operating conditions tests were conducted on a low-speed two-stroke marine diesel engine,six fuels were used in the tests,including distillate diesel(D100),biodiesel(Bio50,Bio30,Bio l0),low sulfur heavy oil(LSFO),and high sulfur heavy oil(HSFO).The results show that when using the D100 and biodiesel,the black carbon emission concen-tration is significantly reduced compared with that of heavy fuel oil,and the black carbon emission reduction effect is more obvious with the increase of biodiesel blending ratio,with a maximum weighted reduction rate of 80％;when using heavy oil,under medium to high load conditions,the measurement results of the filter-type smoke meter are significantly higher than those of the photoacoustic smoke meter,with a relative deviation of over 50％between the two;as the load increases,the concentration of black carbon emissions gradually decreases,the concentration of NOx emissions increases,and the con-centration of CO emissions decreases,when using biodiesel,the concentration of NOx emissions is higher than other fuels,while the concentration of CO emissions is relatively lower;When using biodiesel,the maximum peak pressure in the en-gine cylinders is significantly higher than that of the other fuels,and the forward shift of the center of the cylinder pressure curve means that the fuel combustion exotherm is rapid and the energy conversion efficiency is high,but due to the lower net calorific value of biodiesel,so the brake specific fuel consumption is higher when using biodiesel.The results of this paper can provide a reference for the R & D of ship black carbon emission reduction technologies and the formulation of relevant emission regulations.
black carbonmarine enginebiodieselemission characteristicssmokemeter
NETL
NSTL
万方数据
