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Technical Paper

Experiments and Analyses on Stability/Mid-Channel Collapse of Ash-Deposit Wall Layers and Pre-Mature Clogging of Diesel Particulate Filters

The conventional concept of soot and ash wall deposits (cake-layers) gradually building up along the channels of a ceramic honeycomb and then periodically or continuously being swept downstream toward the “end-plugs” of the channels may not always occur in practice. When deposits irregularly form on or detach from the walls (mid-channel collapse), causing premature clogging usually around the mid-sections of the channels, the particulate filter could experience a much more rapid rate of back pressure rise, resulting in the need of premature repair or replacement. Experiments were performed, accompanied by analysis and simulation, to investigate the factors that contribute to the pattern of wall deposits, particularly of ash, and the stability of the deposit layers.