Patent ID: 8353698

Claim:
A coaxial injection device for injecting and dispersing reagents into a reactor, comprising: an exterior duct configured to inject high-velocity gas into the reactor to disperse the reagents into the reactor; an outer-middle injector with at least one constricting orifice for liquid injection, the outer-middle injector being recessed relative to the exterior duct and having a cooling liquid water or cooling steam therein; an inner-middle duct for low-velocity gas injection, the inner-middle duct being recessed relative to the outer-middle injector, wherein the inner-middle duct is in communication with a supply of cooling air, the supply of cooling air having a velocity less than the high-velocity gas of the exterior duct that is chosen to disperse reagents into the reactor; and an interior injector with a constricting orifice for liquid injection, the interior injector having a liquid urea solution therein; wherein, the exterior duct is formed by the internal wall of an insert and the external wall of the outer-middle injector; and is located externally to and circumferentially surrounds all other injectors and ducts; the outer-middle injector is formed by two concentric cylinders connected with an endplate, the endplate being substantially perpendicular to the two concentric cylinders and defining at least one injector orifice configured to inject reagents into the reactor; the inner-middle duct is formed by the interior wall of the outer-middle injector and the exterior wall of the interior injector; the interior injector is formed by a cylinder with the endplate being substantially perpendicular to the interior injector cylinder and defining the constricting orifice of the interior injector; wherein the exterior duct injects high-velocity gas to disperse the reagents injected through the outer-middle injector, the inner-middle duct and the interior injector thereby ensuring the mixing and dispersion of the liquids and gases into the reactor to increase reaction homogeneity, reaction efficiency, reactor efficiency and reduced byproduct formation.