Momentum probe and sampling probe for measurement of particle flow properties in CFB boilers

Journal article, 1997

With the aim of making local particle flow structure studies in commercial scale circulating fluidized-bed (CFB) boilers, a momentum probe and a non-isokinetic particle sampling probe have been designed to measure local momentum flux of gas-solids flow and particle flux. The time-averaged, local particle velocity and concentration are deduced from the measurement results of these two probes. The two probes were calibrated and validated in situ in a CFB boiler furnace. In order to better understand the principle of the momentum probe and to ensure reliable measurements, a theoretical model is established by focusing on the particle deceleration movement inside the probe tip. This model is able to predict the relationship between the gas-solids momentum flux and the impact pressure as obtained from the calibration.