Effect of dust deposition on collection performance of ceramic candle filter system

Abstract

Ceramic candle filters have been developed as a high temperature particulate collecting system with very high collection efficiency because of their good thermal resistance and chemical corrosion resistance. Understanding of dependence of the filter performance on the operating parameters such as inlet dust concentration and regenerating pulse system will be essential for their engineering and economical design. In the present work we have made use of a small scale dust collector with a single ceramic candle filter to investigate the dependence of pressure drop of clean virgin candle filters and filters with dust load on various operating parameters. A fundamental understanding of the particle transport and deposition processes in the filter chamber would lead to lower investment, reduced risk and ease of operation of the filtration systems. One technique frequently used to simulate velocity distribution applies computational fluid dynamics (CFD). Determination of the parameters involved in the calculation of velocity distribution, was supported by a computer package known as "FLUENT". These results have led to a better understanding of the phenomenon of filtration of gas and dust loading distribution. A differential pressure transmitter is used for monitoring the pressure drop ([Delta]P) across the ceramic filter which is recorded by a data logger. The plot shows the relationship between the pressure drops across the candle and the cycle time. In this case, the activating pressure drop setting on the programmable logic controller (PLC) will be varied from 15 to 35 mm[H[subscript 2]O], with a pulse duration time of 100 ms. Generally, the ceramic candle filter was not perfectly cleaned at the start of an experiment, even though it was exposed to a large number of jet pulses. The deposition of dust on the surface of the filter provided a strong effect on the collection of incoming dust and this phenomenon also affected the initial and residual pressure drop of the system. Trade-off of these two effects should be taken into account and investigated further