A new monitoring system of the flow states of gas-liquid two-phase flow has been developed by using a differential pressure transducer combined with wavelet analysis and fuzzy pattern recognition technique. The differential pressure signal of gas-liquid two-phase flow was obtained under the states of the different flow patterns. including bubble flow. flow, slug flow, plug flow and annular flow. The acquired differential pressure signals were analyzed by the wavelet transform and the eigenvalues were extracted. The flow state of the system was mnitored by fuzzy pattern recognition technique. The experimental results show that the developed system can moinitor flow states of horizontal gas-liquid two-phase folw effectively.

Based on the electrical capatitance tomography tehnique, a voidage measurment system that can implement a voidagedistribution display and voidage measurement of a gas-solid fluidized bed sumultaneously is developed. The back projection algorithm is selected as the image reconstruction algorithm to satisfy the requeiremnt of voidage distribution display. Combining the Tikhnovregularization principle with the ART algorithm. A new quantitiative hybrid image reconstruction algorithm is presented to implement the voidage measurement of a gas-solide fluidized.Experimental results show that the developed measurement sysytem is successful. The speed of image reconstruction of voidage distribution is greater than 20 frames per second. The maximum error of voidage measurement can be less than 5%.