Fig. 1. System schematic diagram P1/P2: Pressure gas tube; P3: Sample transport tube; V1: Gas reversing valve; V2: Gas pressure reducing valve; V3: Gas valve; V4: Ball valve

Fig. 2. Diagram of double casing tube

Fig. 3. Schematic of the calculation model

Fig. 4. Force on the sample in the pipe

Fig. 5. Varitions of sample speed over time in different gaps

Fig. 6. Maximum pressure difference under different gaps

Fig. 7. Diagram of principle prototype Enter the reactor: 1-Pneumatic conveying starting point, 2-Pneumatic conveying end; Out of the reactor: 2-Pneumatic conveying starting point, 3-Pneumatic conveying end

Fig. 8. Sensor installation (a) Sensor installation at the load station, (b) Sensor installation at the bottom of the double casing tube