In order to explore the regeneration performance of catalytic diesel particulate filter(CDPF)

an in-house-made CDPF carbon particle loading device was developed. The effects of carbon loading

regeneration temperature and gas flow rate on the regeneration performance of CDPF were studied through a simulated gas test platform

and the regeneration efficiency

regeneration efficiency ratio

maximum temperature and maximum temperature gradient were evaluated. The results show that there are two main stages in the CDPF regeneration. The first stage mainly takes place between 250 ℃ and 400 ℃

which is a long regeneration at low temperatures; the second stage mainly occurrs between 500 ℃and 600 ℃

which is a short regeneration at high temperatures. When the regeneration temperature is 350 ℃ and the gas flow rate is 200 mL/min

the maximum temperature gradients of 3.2 g/L

5.0 g/L and 7.0 g/L carbon loading are the smallest

being 2737.5 ℃/m

4387.5 ℃/m and 3837.5 ℃/m respectively. The regeneration efficiency is about 6% at 250 ℃

and 85.6% at 550 ℃. When the carbon loading is 5.0 g/L

the regeneration temperature is 500 ℃ and 550 ℃ and the gas flow rate increases to 300 mL/min

the maximum temperature

the maximum temperature gradient and the regeneration efficiency all reach the highest

and the regeneration efficiency ratio decreases from 4.6×10-5 J-1 to 1.8×10-5 J-1 with the increase in the gas flow rate.