Computational Investigation of Gas- Solid Flow in PFBC Plant

This paper reports a computational Fluid Dynamics (CFD) investigation for a high-temperature high-pressure filtration (ceramic candle filter). However parallel flow to the filter is considered in this study. Different face (filtration) velocities are examined using the CFD code, FLUENT. Particles ranging from 1 to 100 microns are tracked through the domain to find the height at which the particles will impinge on the filter surface. Furthermore, particle distribution around the filter (or filter cake) is studied to design efficient cleaning mechanisms. Gravity affect to the particles with various inlet velocities and pressure drop are both considered.

Characteristics on High Temperature Particulate Clean Up in a Pilot Scale Vitrification Plant

Characteristics of high temperature filter system were evaluated and the operation parameters were identified through a series of tests by the ceramic candle filter elements. At the first time of the tests, the trend of the pressure drop across the filter was increased sharply. But due to the growth of dust cake on the surface of filters it became stabilized to a certain level soon. The pressure drop was increased by the face velocity strongly. The permeability of the filter element decreased rapidly in the initial time but because the deposition and it also became stable as time goes on. Dust collection efficiency of the filter was higher than the designed value of 99.9%. Dust cleaning of the filter surface was effective under the back flushing pressure range of 1 to 5 bar. Finally, at the long-term vitrification test, no specific defect or failure were occurred to the ceramic candle filter. Based on the test results, the performance and durability of the ceramic candle filter was proved as sound.