Fig.10 Change in PM, SOF and DS Concentration

Fig.11 Change in UV Absorbency by SOF

Fig.12 Change in Sulfide Concentration in Exhaust Gas

Fig.13 Change in Equivalent Sulfuric Acid Concentration in Exhaust Gas

　

NO² concentration however remains remarkably low at about 100ppm. Moreover, SO² concentration decreases 17% from 882ppm to 735ppm probably due to the reduced amount of the heavy fuel oil. As shown in figures 10 and 11, along with the increase in WPD ratio PM, SOF, DS as well as UV absorbency by SOF decrease significantly as a result of the decrease in SOF concentration. In order to evaluate sulfide and nitrate fraction brought about by the exhaust gas, the gas was bubbled in a water bubbling pot and the water's pH concentration was measured and converst into the equivalent amount of sulfuric acid diluted in the same amount of water. Figures 12 and 13 show the tendency increasing towards pH concentration and consequently the decrease in the equivalent emitted sulfuric acid in the exhaust gas as the WPD ratio decreases due to the decline in SO². In the present paper, the emission of metals and non-metals was also inspected. Figure 14 and 15 show the qualitative as well as quantitative metal and non-metal emissions from the exhaust gas. As shown in the figures, S, Si, Al, Mg and V were found and the emission rates range from 0.013 to 1.34 mg/m³N.

BACK　　　CONTENTS　　　NEXT