The radial distribution of solids hold-up in the riser of the compound reactor was measured in different operating conditions by PV-4A optical fiber density apparatus.

Simulation of particle velocity field and solid holdup in liquid-solid circulating fluidized beds;

Experimental results show that filter media velocity and solid holdup increases at the beginning and then decreases with the increase of axial position.

Pressure drop,minimum fluidized velocity,solid holdup,local solid holdup distribution and gas phase backmixing are fundamental to the scale-up design and optimization of gas-solid(G-S) magnetically stabilized reactors.

Results showed that suitable solid content wastewater recycling could improve the coagulation condition of water treatment process and save the coagulant,the save ratio is about 10%~40%.

The results indicated that under the condition of regular turbidity of original water,the optimum ratio of solid content was less than 1% if the wastes was recycled, and that the optimum ratio increase with the turbidity when the turbidity of raw water was less than 60 ntu.

The calculation accuracy of the solid content is not high because the errors occurred during the mensuration of sizing's refractivity,therefore it is necessary to test the dependability of these data.