Measuring method using PZT AE sensor for massflow of moved bed gravity flow

Abstract

This paper shows that a PZT acoustic emission sensor is suitable, as one of the novel nonintrusive methods, for mass flow measurement of moved bed gravity flow in a stand pipe of the new high calorie gasifier or DRI process. This sensing signal is suitable for the process at 2/spl sim/:48 cm/s. The accuracy is below /spl plusmn/1.6% FS for 40.0/48.5 /spl phi/ pipe without band-pass filter. The band-pass filter is suitable for 75 kHz in 20.1/27.3 /spl phi/ and 40.0/48.5 of steel stand pipe with 1.8 /spl phi/ 1.5 kg/l silica pellets. It is able to delete inverse response of moved bed gravity flow. The frequency of red bean was 36 kHz in 20.1/27.3 /spl phi/ pipe.