The invention relates to an enclosure for the downward flow of a liquid, preferably hydrocarbon-based, containing solid particles, comprising a bottom comprising a cylindrical upper part (11), a lower part (12) with decreasing section and angle of inclination α variable relative to the vertical axis (Z), an outlet pipe (9); injections (5) and (6) of recycled and / or supplemental liquid in the lower and upper parts respectively. The injections (5) are inclined relative to the tangent to the wall of the lower part at the injection point by an angle β1 in the vertical plane (xz) and an angle β2 in the horizontal plane (xy). The injections (6) are inclined relative to the wall of the upper part by an angle θ1 in the vertical plane (xz) and an angle θ2 in the horizontal plane (xy). The angles β1, θ1 are between 5 ° -175 °, the angles β2, θ2 are between 0 ° -180 °. Figure 1 to publish.
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