METHOD FOR TRANSPORTING POWDERY MATERIALS WITHOUT SEGREGATION

摘要

The invention relates to a method for transporting a powdery material by potential fluidisation, according to which a device is installed between the supply region and the region to be supplied, said device comprising at least one substantially horizontal conveyor, called "aeroducting", which has a lower duct for the circulation of a gas and an upper duct for the circulation of the powdery material, the lower duct and the upper duct being separated by a porous gas-permeable wall. According to said method, the upper duct is filled with the powdery material and the lower duct is supplied with pressurised gas enabling the potential fluidisation of the powdery material in the upper duct provided with at least one pressure equalisation column. The minimum bubbling speed corresponding to the maximum vacuum rate is determined in advance, and the fluidisation pressure is regulated to a value such that the fluidisation speed of the gas is between 0.8 and 1.5 the minimum bubbling speed, preferably between 0.9 and 1.3 times the minimum bubbling speed.