《Table 1 Properties of coal and bed material》

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《Influence of Solids Circulation Flux on Coal Gasification Process in a Pressurized High-density Circulating Fluidized Bed》

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The coal gasification experiments were performed in a lab-scale pressurized high-density CFB，whose schematic diagram is shown in Fig.1（a）.The riser is 0.102 m diameter and 17.0 m high from the solid-inlet.Silicon sand was used as the bed material，and all sand particles were initially packed in the J-leg and the standpipe on the start of gasification experiment.The lignite coal was transported into the riser from the coal-inlet，and Table 1provides the coal properties.The gas mixture including air，oxygen and steam was introduced into the riser through the gas-inlet at the bottom of the riser.The gasification processes are operated around 0.6 MPa，and the detailed operating conditions and gasification results are listed in Table 2.In this work，only the riser is simulated，and the two-dimensional model is used as shown in Fig.1（b），which is selected based on the previous work of our group on the simulation of gas-solid flow behavior in this system.