CATALYTIC CRACKING SPRAY NOZZLE WITH INTERNAL LIQUID PARTICLE DISPERSION RING Russian patent published in 2018 - IPC B05B7/04 

FIELD: chemical or physical processes.

SUBSTANCE: invention relates to spray nozzles adapted for spraying and spraying liquid supplied to a catalytic cracking riser reactor with a fluidised catalyst. Catalytic cracking system comprises a riser reactor; nozzle assembly (10) installed in wall (11) of the riser reactor for discharging the sprayed liquid hydrocarbon into the riser reactor. Nozzle assembly (10) comprises a nozzle body in the form of hollow cylindrical tubular element (30), which defines cylindrical mixing zone (20) and cylindrical barrel extension zone (24) located downstream of mixing zone (20), having an axial length which is 2–10 times the axial length of mixing zone (20) and extending through wall (11) of the riser reactor. System also comprises fluid inlet (21) supported by tubular element (30) and configured to direct through it a flow of fluid under pressure in mixing zone (20), and impingement pin (34) supported by tubular element (30) protruding into mixing zone (20) and having impingement surface (70) that is substantially aligned with fluid inlet (21) and to which the pushing and direction in the transverse direction of the flow of fluid directed into mixing zone (20) is provided. System also comprises gas inlet (22), mounted at the upstream end of tubular element (30) and configured to direct gas flow through it into mixing zone (20) along central axis (72) of mixing zone (20) for spraying a liquid colliding with impingement surface (70) and directing the sprayed liquid through barrel extension zone (24). System also includes spray tip (25) mounted at the end of tubular element (30) which is located downstream. and having outlet (26), through which the sprayed liquid is released from barrel extension zone (24) with a given spray pattern. System has cylindrical dispersion ring (85), made separately from tubular element (30), fixedly supported in said tubular element (30) downstream relative to impingement pin (34) between mixing zone (20) and barrel extension zone (24). Dispersion ring (85) forms a circular ledge, extending in the radial direction and having a radial depth of 1/10 to 1/8 of the internal diameter of mixing zone (20) and cylindrical barrel extension zone (24), for directing the peripheral part of the gas stream under pressure and the sprayed liquid in the radial direction inward to facilitate continuous mixing of the fluid flow and pressurised gas as they pass through barrel extension zone (24) for release from spray tip (25) without creating undesirable interference with the sprayed liquid stream passing from mixing zone (20) to barrel extension zone (24) and through it.

EFFECT: technical result of the invention is to increase the efficiency of the system by improving the continuous mixing of the sprayed liquid hydrocarbon and simplifying the design.

6 cl, 2 dwg