《Table 1 Physical properties of glass beads used in the experiments》

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《Influence of Negative Pressure Gradient on Pressure Distribution and Gas-Solid Flow Pattern of Solid Feed Systems》

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The solid feed system，which was made of transparent Plexiglas for easy observation，included a hopper，a conical hopper，a standpipe（0.07 m in i.d.×2 m in height），a loop seal and a solids collector，as shown in Figure 1.The loop-seal had a rectangular cross-section，0.10 m in width，0.215 m in length，and 0.51 m in height.It consisted of a supply chamber（0.10 m×0.10 m）connected to the standpipe and a recycle chamber（0.10 m×0.10 m）.The two chambers were connected with a thin partition（0.015 m thick）with an opening of0.03 m in height.The weir section was 0.235 m high.During the experiment，the loop seal operating air came from the wind boxes located under the supply chamber.Bed material was introduced into the system through a hopper linked to the standpipe.The solid particles from the hopper were transported into the standpipe through a loop-seal for regulating the solid flow rate by aeration prior to being fed to the receiving tank.Under normal operating conditions，three rotameters（0.1―1.6 m3/h），including one for recycle pipe and the others for the loopseal aeration，were used for controlling and measuring the gas flow rate.The time（t）and the weight of the cumulated powder in the receiving tank were measured，from which the solid flow rate could be calculated.A pressure sensor testing system was used to record the pressure signals.As illustrated in Figure 1，the interval of pressure taps was 100 mm on the standpipe，the location of the last pressure tap was 30 mm above the bottom of loop-seal.The height of solids in the recycle chamber（Hf）was measured simultaneously during the experiment.The fluidizing gas was air（20°C，101 k Pa），with a density of1.21 kg/m3 and a viscosity of 1.79×10-5 kg/（m·s）.Glass beads were used as the solid particles，which had good fluidization ability.Table 1 shows the main physical properties of the glass beads.