Patent ID: 9694334
Date: 2017-07-04
CPC Classifications: B01F,B01J,C07C,Y02P

Claim:
1. A urea plant decomposer with a gas diffusion system configured to feed a passivating gas stream into the urea plant decomposer extending along an axis, said urea plant decomposer comprising: a bottom holder which defines a chamber, said bottom holder including: a gas feed conduit including: a diffuser assembly including a central diffuser and a peripheral shield which are spaced axially apart along the axis and offset radially with respect to each other, wherein the peripheral shield includes an annular member positioned about the axis and defining a plurality of through peripheral openings, angularly spaced apart from one another and uniformly distributed around the axis, and the diffuser assembly is configured to diffuse the passivating gas stream from the gas feed conduit inside the chamber, said diffuser assembly being shaped to: