Axial and transverse characterizations of ceramic candle filters

Ceramic candle filters are stiff composite tubes used in particle-removal during hot-gas filtration in coal energy generation. These filters are designed to withstand high temperature and pressure gradients. To determine the consistency in manufactured qualities of these filters, dynamic characterization method is recommended as a nondestructive evaluation technique. Six filters of the same manufactured batch were tested dynamically to establish the baseline properties of these filters. The test results are compared to theoretical values and are used to identify the variation in the manufactured products. This paper reports the frequencies in both transverse and axial directions indicating acceptable variations between all filters that are compatible to variations in measured physical parameters including density, stiffness and elastic modulus.