Effect of uniformity of the residual dust cake caused by patchy cleaning on the filtration process

• The dust cake uniformity was proposed and defined.
• The residual dust cake uniformity had significant effect on the filtration process.
• A filtration model considering the cake uniformity was built and fit well with test.

Residual dust cakes have significantly influenced the filtration process, although its distribution uniformity has been rarely studied in previous references. In this research, we propose a definition of the dust cake uniformity for the first time, based on the assumption that the dust cake was rearranged into new location on the filter and the filtration area was divided into three regions. A simple but effective model was established with the main focus being the effect of the residual dust cake uniformity RU on the filtration process. Results show that the numerical model was validated by the experiment, with RU being a key factor within the filtration model. The pressure drop increased noticeably with increasing RU, and the exponential correlation between the residual pressure drop and RU was obtained. The filtration cycle time decreased, with the increase of RU, while the regional surface dust mass, regional filtration velocity and rebuilding dust cake uniformity increased. Additionally, evolutions of the pressure drop increasing rate and regional dust cake thickness were complex with RU.

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