On-line fault diagnosis model for rigid ceramic filters based on outlet
concentration and dynamic pressure
Abstract
Sudden fractures in rigid ceramic filter tubes hinder the stable
long-term operation of advanced power-generation processes. In this
study, Time difference of arrival (TDOA) of dynamic pressure in the
inner wall of filter during pulse jet cleaning process and outlet
concentration with diameter of leakage during filtration and pulse jet
cleaning process are investigated using high frequency sensors and
optical particle spectrometry. The outlet concentrations measured under
different leakage agreed with the theoretical values, with the peak
outlet concentration being 2.5 times greater than stable outlet
concentration. There is a linear relationship between leakage aperture
and theoretical outlet concentration in leaking ceramic filter tubes. A
positioning model that can precisely locate the leaking ceramic filter
tube using the time difference in the dynamic pressure as measured at
different positions is established. This research can quickly and
accurately determine whether a ceramic filter tube is broken and
location of breakage.