Effect of pressure and temperature on the axial dispersion of gas in a bubbling fluidized bed

The effect of pressure and temperature on the axial dispersion of gas was e xamined in a fluidized bed of 10 cm I.D. x 100 cm, height. The employed par ticle was zinc titanate catalyst and particle size was 150,um. The stimulus -response method was employed in order to determine the axial dispersion co efficient of gas in a bubbling fluidized bed. The hydrogen was used as the trace gas. The experimental results showed that the increase of pressure an d temperature did not significantly change the axial dispersion coefficient in spite of significant increase of minimum fluidization velocity.