METHOD AND SYSTEM FOR MEASURING SOLIDS FLUX IN CIRCULATING FLUIDIZED BED

摘要

Disclosed are a method and a system for measuring solids flux in a circulating fluidized bed. The measuring method comprises the following steps: 1) selecting two cross-sections in the falling section of the circulating fluidized bed reactor as measuring planes; 2) for each measuring plane, continuously measuring the average volume fraction in the solid cross-section of the measuring plane with a fan-beam ray in a period of time; the fan-beam ray being a fan-beam-shaped ray capable of penetrating the solid material in the reactor; 3) calculating the cross correlation function R(τ) for the time functions of the average volume fractions of the solid cross-sections for these two measuring planes, calculating the time τ at the maximum value of the cross correlation function and taking the time τ as the time for the solid material to move from the upper measuring plane to the lower measuring plane, and in turn calculating the solids flux of the circulating fluidized bed. The measuring method does not interfere with the flow field in reactors, does not lead to artificial gap operations, has true and reliable measuring results and can be used in extreme measuring environments of high temperatures and high pressure and even toxic environments.