No abstract

A new kind diesel particulate filter (DPF) with gear-shaped wood fiber filter element is researched and it has very low cost and less requirement for fuel quality. In this paper, the mathematical models of the filtration resistance and the structural parameters of the wood fiber filter element were established first. Then by SEM, the advantages of this material can be proved. Finally, to verify reliability and efficiency of the filter elements with different structure parameters, the filtration resistance change were compared and analyzed through a DPF bench test based on meeting the demand of filtration efficiency that is above 85%. The test results showed that the filtration efficiency is more than 85% and the filtration resistance is below 3 kPa. Meanwhile, the life span of this new kind wood fiber filter is more than 90 h and the cost of it is very low.

In order to reduce the emissions of pollutants from diesel exhaust, a kind of exhaust purification technology by the combination of non-thermal plasma (NTP) with Nano-CeO 2 supported on the micro-wood fiber filter is proposed, and a simulation test bench is designed to test the influence factors of purification efficiency. It can be seen from the simulation experiments, the purification efficiency for particulate matter (PM) and NO x can be enhanced from 37 and 28% to 53 and 38% when the content of Nano-CeO 2 is from 0 to 16.92 wt%. The test results also show that the purification efficiency of PM and NO x increases with the rising of temperature between 40 and 160 C. Furthermore, when the mass of PM is no more than 30 mg, the purification efficiency of PM and NO x increases with the rising of PM mass. At last, the experiment shows that when the input voltage is between 6 and 12 kV, the corresponding purification efficiency increases with the rising of voltage. Temperature 160 C, catalyst 16.92 wt%, input voltage 12 kV, and PM 30 mg are the best experimental conditions for this study, in which the corresponding purification of PM and NO x is 66 and 53%, respectively. This can provide an experimental basis for the practical application of NTP and wood fiber filters in the field of exhaust gas purification.