Powder transport device and char recovery device

A powder transport device, comprising:

• a powder transport line which can transport powder by way of gravity by having a prescribed angle of inclination;
• a porous plate which is disposed along the powder transport line to divide a line cross section into a top section and a bottom section and form a powder line in the top section;
• a supply line which is provided below the porous plate and supplies an inert gas for fluidization to the powder line through the porous plate;
• a fixed amount supply state monitoring device which detects a wall surface temperature of the powder transport line and includes multiple temperature sensors for monitoring a fixed amount supply state of flowing powder in the powder line, the multiple temperature sensors being provided in an axial direction of the powder transport line;
• and
• a controller which controls an amount of the inert gas for fluidization supplied to the supply line so as to fluidize the powder deposited in the powder line, if at least one detection value of the multiple temperature sensors indicates a state where a flow amount of powder decreases in association with a decrease in the wall surface temperature of the powder transport line.