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Outline
To investigate the feasibility of utilizing diesel oxidation catalytic converter(DOC) technology in marine medium speed diesel engines, an experimental study was conducted to examine the effects of DOC on selective catalytic reduction(SCR) performance and physicochemical properties of particulate matter(PM) under typical low temperature and high flow conditions in marine diesel engines. The experimental results demonstrate that the utilization of DOC can enhance the catalytic efficiency of the SCR system in typical low temperature and high flow conditions, resulting in a 65% increase in catalytic efficiency under high load(18000h-1) exhaust condition of the diesel engine. The addition of DOC can decrease the degree of graphitization in PM, and this effect is more pronounced at higher exhaust temperatures. The application of DOC can also enhance the concentration of oxygen-containing functional groups on the surface of PM, particularly leading to a 100% increase in the concentration of C—OH functional group. Consequently, this significantly enhances the oxidation activity of PM. In hydrogen-containing functional groups, the concentration of aliphatic C—H functional group, which serves as the growth nucleus of PM, is significantly reduced by 50%, thereby impeding the continued growth and aggregation of PM.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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