Patent ID: 7021870

Claim:
A device for the transport of granular solid particles with a controlled flow rate, comprising: a) a substantially rectilinear pipe (A) having an angle to the vertical of 0–40° for feeding granular solid particles in the dense phase, placed so that the particle flow is by gravity, b) downstream, a pneumatic transport pipe (C) comprising means ( 3 , 4 ) for introducing a primary gas so as to carry out the transport of said particles in the dilute phase, c) a transfer pipe (B) having a substantially rectilinear primary portion ( 20 ) that connects without a buffer space the base of said feed pipe (A) to said pneumatic transport pipe (C), whereby said transfer pipe (B) forms a junction with feed pipe (A) and is inclined relative to the vertical along a non-zero angle of less than 90 degrees, for an upward circulation of the particles, said transfer pipe (B) comprising secondary-gas injection means ( 17 , 18 , 35 ), located approximately at the junction between feed pipe (A) and transfer pipe (B), with an injection direction means forming an angle of at least 120° with the axis at the bottom end of the feed pipe (A) at said junction with transfer pipe (B), and d) means for controlling the flow rate of secondary gas.