Preparation of Granular Ceramic Filter and Prediction of Its Collection Efficiency

Abstract

The silicon carbide (SiC) ceramic filter is the most favorable component to remove particulate matter from hot flue gas due to its high filtration efficiency and high thermal durability. The effect of SiC powder size on the physical properties and filtration performance to prepare high-performance granular ceramic filter media was investigated in this study. Disk-type filter media were prepared by mixing ceramic components followed by physical compression and sintering. The porosity and average pore diameter in the filter media increased with increasing powder size. However, the mechanical strength decreased with increasing powder size, while it increased with increasing physical compressive force. The filter performance factor, q FM was introduced to evaluate the ceramic filter properties, and the SiC50 filter was the best of the ceramic filters prepared in this study. We also found that diffusion was a dominant collection mechanism for particles smaller than 0.7 mm, and direct interception and inertia were dominant collection mechanisms for particles larger than 0.7 mm in the SiC50 filter based on a single collector efficiency model. In addition, the predicted collection efficiencies showed reasonably good agreement with the experimental ones.

Effect of sintering temperature in preparation of granular ceramic filter

“…The mechanical strength was measured using a universal testing machine (UTM) (KDMT-156, Kyung Do Precision). A special jig was also used to hold a thin ceramic filter based on our previous study [3]. The crystallinities and phase transitions of the ceramic filters were examined by X-ray diffraction (XRD) (X'Pert Pro MPD diffractometer, PANalytical CO.) using Cu-Kα radiation.…”

“…Ceramic filters can be applied to remove particulate matters in hot flue gas from coal-fired power plants, especially pressurized fluidized bed combustion (PFBC) systems and integrated gasification combined-cycle (IGCC) systems [1][2][3]. Moreover, efficient hot gas filtration becomes more important to protect downstream equipment for effective energy recovery and gas separation [3][4][5][6].…”

“…Silicon carbide (SiC) is one of the most preferable candidates for the fabrication of ceramic filters because of its high corrosion resistance, thermal shock resistance, and excellent mechanical strength [3,5,[7][8][9][10]. Ceramic filters made of silicon carbide can be manufactured by various methods, including slip casting [11,12], ramming [13], vacuum extrusion [13], melt infiltration [14], and so forth.…”

“…Moreover, efficient hot gas filtration becomes more important to protect downstream equipment for effective energy recovery and gas separation [3][4][5][6].…”

Experimental study on mechanical filtration through tobacco columns: Influence of cut-filler shape and size distribution on filtration efficiencies

“…They found that filtration efficiency was increased with the degree of sphericity. Choi et al (2014) investigated the influence of the granular size and its distribution on filtration efficiency and pressure drop. However, their approaches could not focus on the relationship between heterogeneity and filtration efficiency.…”