To uniformly distribute particles to a pair of branch pipes even if high pressure conveyance is implemented by providing at a location spaced apart from a branching point of a main pipe a narrowed portion consisting of a reducing pipe, a small diameter pipe and an expanding pipe having a common center axis with the main pipe.

A narrowed portion 24 consisting of a reducing pipe 25, a small diameter pipe 26 and an expanding pipe 27 is provided at a portion of a main pipe 20 somewhat spaced apart from a branching point 21 to an upstream side. The main pipe 20 has a common center axis with the respective pipes of the narrowed portion 24 and a nose 23 is located on the center axis. The main pipe 20 has a same diameter at front and rear sides of the narrowed portion 24. When flow rate of particles is high, the particles are clustered one side within the pipe and drifts toward the center axis as approaching the narrowed portion 24. The particles are mixed again and accelerated in the small diameter pipe 26. In the expanding pipe 27 the particles flow in angles smaller than an expanding angle and are blown out. In the main pipe 20 downstream of the narrowed portion 24 the particles symmetrically flow with respect to a center line located at around the center axis of the pipe. Because the particles move toward a branching point 21 in an above described state, the particles are uniformly distributed to branch pipes 22 by a nose 23.