The Influence of Different Inlet Flow Temperatures on the Particle Emission Characteristics of DPF Regeneration Process

Paper #:
  • 2017-01-2377

Published:
  • 2017-10-08
Author(s):
Affiliated:
Abstract:
Zhongwei Meng1,2, Jiansong Li1,Miao Liu1, Jia Fang1,2* (1. Sichuan Collaborative Innovation Center for Automotive Key Components, School of Automotive and Transportation Engineering, Xihua University; 2. Key Laboratory of Fluid and Power Machinery (Xihua University), Ministry of Education.Chengdu, P. R. China, 610039) Abstract Based on the regeneration performance testing bench, the particle emission characteristics of DPF at different inlet flow temperatures were studied. The results show that the outlet particle size of the DPF was mainly in the nuclear mode during regeneration process, and the peak particle size was between 5nm and 25nm. The total concentration of the particles at DPF outlet was 103/cubic centimeters without regeneration. While the total concentration of the particles was 107-108/cubic centimeters during regeneration process, which was higher than 4-5 orders of magnitude compared with non-regeneration process. Below 510 ℃, the particle concentrations at DPF outlet was of the order of 107/cubic centimeters, but the value of the particle concentration was not fluctuated even when the temperature reached the peak inside the filter . At 510 ℃, the particle concentrations at DPF outlet increased sharply in the numerical value. When the temperature peak appeared in the DPF substrate, the value of the particles reached the maximum, with the order of magnitude of 107/cubic centimeters. Then the particle concentration decreased with the decreased of the temperature in the filter until the peak disappeared. At 550 ℃, the particle concentrations at DPF outlet increased sharply. The particle concentration was on the order of 108 /cubic centimeters when the internal temperature peak was appeared. In summary, the particle concentration at the outlet of filter was closely related to the regeneration process. When the temperature peak appeared in the filter, the outlet particle concentration was increased. Therefore, in order to control the emission particle concentration, the rapid regeneration process of high temperature should be avoided to prevent the occurrence of internal temperature peaks. Corresponding author: Tel: +86 028-87726799 E-mail address: jiafang@mail.xhu.edu
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