FIELD: computing; counting.
SUBSTANCE: invention relates to spray nozzles and, more specifically, to spray nozzle assemblies adapted for atomising and spraying liquid supplied to the riser of a fluidised catalytic cracking reactor. Air assisted spray nozzle assembly (10) for spraying liquid into a riser of a fluidised catalytic cracking reactor comprises hollow nozzle body (30) extending through wall (11) of a fluidised catalytic cracking reactor. Hollow nozzle body (30) is formed by a cylindrical tube and is long enough to allow the riser of the fluidised catalytic cracking reactor to pass through wall (11). Nozzle body (30) formed from a cylindrical tube forms mixing zone (20) and cylinder expansion zone (24) located downstream of mixing zone (20) with an axial length greater than that of the mixing zone. Assembly also comprises liquid inlet (21) fixed in an opening in the side wall of integrated nozzle body (30) formed from a cylindrical tube, through which a jet of liquid under pressure is directed to mixing zone (20). In addition, assembly comprises impingement pin (34) fixed in the side wall of nozzle body (30) from a cylindrical tube and extending into mixing zone (20), having impingement surface (70), essentially aligned with fluid inlet (21), which is struck by a jet of fluid directed into mixing zone (20) from fluid inlet (21). Assembly also includes pressurised gas inlet (22), installed at the upstream end of nozzle body (30) formed from the cylindrical tube, through which the jet of gas under pressure is directed to mixing zone (20) along central axis (72) of mixing zone (20) to atomise the fluid striking impingement surface (70), and spray tip (25) mounted at the downstream end of expansion zone (24) of the cylinder of nozzle body (30) formed from a cylindrical tube, having outlet (26) through which the atomised fluid is discharged in a predetermined spray pattern. In the spray nozzle assembly for gas spraying, the impingement surface of the impingement pin is set radially offset from the central axis of the mixing zone on the side opposite to the fluid inlet at a distance between 1/8 and 1/3 of the radius of the mixing zone. Impingement surface is made with an inward recess for receiving a jet of fluid introduced into the mixing zone from the fluid inlet and the direction of the fluid from the impingement surface and to the central axis of the mixing zone for mixing with a jet of gas under pressure introduced into the mixing zone from the gas inlet for improved separation and atomisation of the fluid to be directed into and through the expansion zone of the cylinder.
EFFECT: technical result of the group of inventions is to increase the efficiency of atomisation and spraying of liquid hydrocarbons with high efficiency in catalytic cracking systems with less susceptibility to wear and erosion during long-term operation, as well as simplifying the design and increasing the cost-effectiveness of manufacturing.
11 cl, 2 dwg
