GAS FLOW STRAIGHTENING DEVICE

PROBLEM TO BE SOLVED: To provide a gas flow straightening device, having no horizontal part, on which powdered body can be accumulated, and capable of preventing the deviated flow of gas in the centrifugal direction. SOLUTION: A gas flow straightening device is provided with a flow straightening vane 2 at the bent part of a duct, through which gas including powdered body is conducted to flow in the flow directions 8, 9, while the flow straightening vane 2 is installed in the rear stage of bent part of the duct 1 so as to be projected into the section or the sectional direction with respect to the flow direction of gas and the surface of the plate is provided with gas passing opening units 3 for unifying the flow amount of gas by changing the opening conditions of the same. The gas passing opening units of the flow straightening vane can be changed so that the opening conditions of the same are changed so as to be increased gradually from the outer rim side of the bent part into the inner rim side of the same and the flow straightening vane can be provided with an adhered powder clearing mechanism while the flow straightening vane can be provided with another flow straightening means arranged in the rear stage of the same.