The experimental study on the solid back-mixing shows that the extensive solid back-mixing exits in the integrated riser. The solid back-mixing increases gradually in the S shape distribution of axial solid density, and decreases gradually in the exponential distribution of axial solid concentration with the increase of axial height. The solid local back-mixing increases gradually in higher gas velocity or in the upper region of lower gas velocity, while decreases gradually at the core region of r/R≤0.5 and...
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