Title :
On-line measurement of the mass flow rate in hot circulating fluidized beds using electrostatic induction charges
Author :
Dybeck, K. ; Nagel, R. ; Schoenfelder, H. ; Singer, H.
Author_Institution :
Tech. Univ. Hamburg-Harburg, Germany
Abstract :
An online measuring system which enables the recording of the two-phase flow parameters average velocity of flow and mass flow rate due to the detection of the electric charge of the particles is presented. This fixed noncontact sensor has been installed in the recirculation line of a pilot scale hot circulating fluidized bed that converts methanol to olefins (h=11 m, riserdia.=0.03 m) and works under rough conditions of process temperature up to 450°C. The whole dynamic area of the integral mass flow in this hot circulating fluidized bed up to 350 g/min was measured. Further investigations show the applicability up to 600°C
Keywords :
charge measurement; electric charge; electric sensing devices; electrostatics; flow measurement; fluidised beds; mass transfer; two-phase flow; 450 C; 600 C; dynamic area; electric charge; electrostatic induction charges; flow velocity; hot circulating fluidized beds; integral mass flow; mass flow rate; methanol; noncontact sensor; olefins; online measurement; process temperature; recirculation line; Charge measurement; Current measurement; Electric variables measurement; Fluid dynamics; Fluid flow measurement; Fluidization; Methanol; Particle measurements; Temperature sensors; Velocity measurement;
Conference_Titel :
Industry Applications Society Annual Meeting, 1994., Conference Record of the 1994 IEEE
Conference_Location :
Denver, CO
Print_ISBN :
0-7803-1993-1
DOI :
10.1109/IAS.1994.377653
