TGS^® is based on the principle of gradient fluidization, designed for raw coal with a size below 80 mm. Fluidization allows solid particles to behave like a fluid under the effect of airflow. According to the difference of critical fluidization air velocity of materials with different densities, the TGS^® arranges multiple exhaust chambers at the bottom of the separation bed, with the flow rate of each wind chamber controlled separately, creating multiple gradient force fields with different fluid apparent air velocities. Under the effect of fluid buoyancy and vibration force, particles of different densities and sizes are in different fluidization states in each gradient, achieving complete density stratification of particles through multi-gradient separation, and then accurately cutting out each layer of particles to achieve precise separation.

The TGS^® system consists of an intelligent gradient-fluidization dry separation system, a digitally controlled air supply system, separation performance X-ray detectors and an intelligent density control system .

(1) The intelligent gradient-fluidization dry separation system is divided into different modules including the homogenisation feeding unit, power unit, separation unit, discharge unit and dust extraction unit.The operation of all module systems can achieve stable and accurate separation performance.

(2) The digital controlled air supply system is consisted of a low noise fan, digital air valve and air duct, providing separation power for the intelligent gradient-fluidization dry separation system, and to improve the separation performance and to achieve gradient fluidization separation.

(3) An automatic sampler and an X-ray separation performance detector are set up in the middlings or reject flows. The detection results are fed back to the intelligent density control system to guide the system adjustment.

(4) The intelligent density control system can receive data from the X-ray separation performance detector, bed state sensor, etc. The embedded controller carries an intelligent gradient fluidization density control model to adjust the separation density to achieve automatic operation . It is especially suitable for feeding conditions where the reject rate of raw coal is very low, very high or fluctuates greatly.