Process for conveyance of powder materials in hyperdense phase applicable to bypassing obstacles

Process for conveyance of a powder material in a hyperdense bed to bypass an obstacle, in which an obstacle bypass device (10;

• 20;
• 30) comprising at least upstream, intermediate and downstream caissons is inserted between two horizontal conveyors, an upstream conveyor (T1), and a downstream conveyor (T2), comprising the steps of:
• at a device entry, at the upstream, caisson (S1) supplying with gas at pressure P1 a lower duct (S1.1), the upstream caisson further comprising an upper duct (S1.2) comprising a column (C1) connected at one end to the upper duct (T1.2) of an upstream conveyor (T1) and at another end to an upper duct (S3.2) in the intermediate caisson (S3);
• in said intermediate caisson between said upstream caisson and the downstream caisson at a level that bypasses the obstacle, feeding a lower duct (S3.1) with gas at pressure P3 and connecting an upper duct (S3.1) which is connected through a first end to the upper duct (S1.2) of the upstream caisson (S1), at a second end to an upper duct (S2.2) of the downstream caisson (S2);
• and
• at a device outlet, at the downstream caisson (S2) supplying with gas at pressure P2 a lower duct (S2.1), the downstream caisson further comprising an upper duct (S2.2) comprising a column (C2) connected at one end to the upper duct (S3.2) of the intermediate caisson (S3) and at another end to the upper duct (T2.2) of the downstream conveyor (T2);
• wherein said caissons remain full of powder material kept in a potential fluidization state at all times, a pressure difference P1−P2 being kept strictly positive.