Abstract
ABSTRACTCleanable dust filter media are typically used in huge baghouse filter apparatuses. Thereby, the regeneration by back-pulsing from the clean gas side is done by either time-controlled or pressure-controlled operation, whereas the latter is more common. Hence, the need for a detailed knowledge of the clogging and filtration mechanisms during long time operation of a pressure-controlled filter aging arises.A mathematical model describing the pressure drop evolution during time-controlled filter aging has been developed. The core of the developed model is the concept of dust masses that distribute themselves on a specific particle deposition area inside and on the surface of the filter medium. By altering this particle deposition area, various clogging mechanisms, occurring during an aging procedure, are covered by the model.In this work, the model was adapted and coefficient parameters adjusted for pressure-controlled filter regeneration operation. A multitude of pressure-controlled test runs were performed in a specially designed filtration apparatus. From these tests, process-specific parameters were regressed and used to model the respective pressure drop curves. These model pressure drop curves show good accordance both quantitatively and qualitatively to experimental data and give a detail view on different clogging mechanisms.
Highlights
Because of their high fine dust filtration capacity, along with more stringent fine dust emission limits, cleanable dust filter media gain importance in the dedusting industry
The core of the developed model is the concept of dust masses that distribute themselves on a specific particle deposition area inside and on the surface of the filter medium
To predict the long-term filtration behavior of cleanable dust filter media, they are aged in laboratory filter test rigs such as the VDI 3926 type 2, the aging procedure can be done in an aging chamber
Summary
Because of their high fine dust filtration capacity, along with more stringent fine dust emission limits, cleanable dust filter media gain importance in the dedusting industry. The large number of influencing parameters (e.g., filter face velocity, raw gas concentration, and regeneration intensity) makes it difficult to predict the long-term clogging and pressure drop behavior of a certain filter medium. To get as close as possible to industrial filtration and cleaning behavior, the aging procedure of these standards has been adjusted within the past few years. Aging hereby is referred to the process in which a filter medium is exposed to a large number of filtration and regeneration cycles in a short period of time to simulate a long operation time. The clogging of a filter medium appears within a very broad time range and is strongly depended on operating parameters such as cycle time, filter face velocity, and valve opening time.[5,6,7]
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