In the bottom region of CFB, the solids volume concentration in the centre region is low, while solids concentration increases significantly towards the wall with the highest solids concentration at wall approaching the value at the packed bed.

Distribution and Calculation of the Solid Concentration in Gas-Solid Risers;

Numerical calculation of axial solid concentration profiles in a high efficiency regenerator;

The solid concentration of gas-solid two-phase flow in a fluid catalytic cracking riser (φ186 mm×12 m) is measured with γ-ray attenuation technology.

Numerical simulation on particle concentration distribution in cyclone separator;

Effects of particle concentration and optical thickness on flame temperature field reconstruction;

The radial profile of particle concentration under different apparent gas velocities with different internals were measured along the dire.

To investigate the pressure drop due to the friction between gas-solid suspension and CFB riser wall and its effect on the measurement of average solids holdups by pressure transducers,models for predicting the pressure drop and the solids holdup were developed.

The pressure gradients of air-sand two-phase flow in a CFB riser were systematically measured in a 10m high CFB riser to investigate the axial distributions of averaged solids holdups of coarse particles and the effects of operation conditions.

A nonlinear model for generation of solids holdup time series in the CFB riser based on combination of chaos with artificial neural network was proposed.

After analyzed the relations among negative ion concentration,stranded density and particle concentration, the feasibility of negative ion applied in a place with a large stranded density was revealed.