Temperature effect on solids mixing on a gas-fluidized bed

Abstract

The effect of temperature on solid mixing rate was investigated both qualitatively and quantitatively for the application of the data to the activated carbon regeneration system. The mixing rate of solid was determined by measuring the residense time distribution (RTD) in a co-current gas-solid fuidized bed. The variables selected for investigation of temperature effect on RTD of solids were temperature, flow rate of fluid and aspect ratio which is the length to diameter ratio of the fluidized bed. The experimental results showed that the onset of fluidization occured earlier than the expected velocity as the temperature rise. And the temperature correction equation for minimum fluidizing velocity was ◁수식 삽입▷(원문을 참조하세요) It was founded from the study that the air flow rate and aspect ratio had a marked influence on mixing pattern of solids, but temperature elevation increased the mixing effect slightly. The tendency to perfect mixing of solids increases with decrease of aspect ratio and increase of gas flow rate. From these observations, the following empirical equation between efficiency of solids mixing and respective variables was derived. $[(η-1) = 0.898 (ν_o/ν{mf})^{-1.411} (L/D)^{0.897} (T/T_o)^{-0.270}]$