Catalytic cracking system with pipe formed nozzle body

Abstract

A catalytic cracking system having a spray nozzle assembly adapted for more economical manufacture and efficient performance. The spray nozzle assembly includes an elongated pipe formed nozzle body formed of one or more lengths of cylindrical pipes which define a mixing zone and an elongated barrel extension zone that extends through a wall of the riser of the catalytic cracking system. The spray nozzle assembly includes an elongated liquid deflection member supported by the pipe formed nozzle body within the mixing zone which defines an impingement surface against which pressurized liquid hydrocarbon directed through a liquid hydrocarbon inlet impinges and is transversely directed from the impingement surface into the mixing zone for atomization and direction through the barrel extension zone by a stream of pressurized steam.

1 . A catalytic cracking system comprising:
 a riser;   a spray nozzle assembly supported within a wall of the riser for discharging atomized liquid into the riser;   said spray nozzle assembly including an elongated pipe formed nozzle body, said pipe formed nozzle body being made of one or more lengths of cylindrical pipe, said pipe formed nozzle body defining a mixing zone and an elongated barrel extension zone longer in length than the mixing zone downstream and in communication with the mixing zone extending through the riser wall,   a liquid hydrocarbon supply,   a liquid hydrocarbon inlet supported by said elongated pipe formed nozzle body through which a pressurized liquid hydrocarbon stream from said liquid hydrocarbon supply is directed into said mixing zone,   an elongated liquid deflection member supported by said pipe formed nozzle body within said mixing zone and defining an impingement surface against which pressurized liquid hydrocarbon directed into and through said liquid hydrocarbon inlet impinges and is transversely directed from said impingement surface in said mixing zone;   a steam supply,   a steam inlet supported by said elongated pipe formed nozzle body through which pressurized steam from said steam supply is directed into said mixing zone for atomizing liquid hydrocarbon impinging upon and transversely directed from said impingement surface and directing the atomized liquid hydrocarbon into and through said barrel extension zone;   a spray tip supported by said pipe formed nozzle body at a downstream end of said barrel extension zone having a discharge orifice through which atomized liquid hydrocarbon directed into and through said barrel extension zone is discharged in a predetermined spray pattern.   
     
     
         2 . The catalytic cracking system of  claim 1  in which said elongated nozzle body is made of more than one length of cylindrical pipe. 
     
     
         3 . The catalytic cracking system of  claim 2  in which said impingement surface is disposed internally within said elongated liquid deflection member. 
     
     
         4 . The catalytic cracking system of  claim 3  in which said elongated liquid deflection member has a central liquid passage communicating between said liquid hydrocarbon inlet and said impingement surface, and said elongated liquid deflection member includes a plurality of liquid hydrocarbon discharge orifices adjacent said impingement surface and transverse to said central liquid passage for directing liquid hydrocarbon transversely relative to said central liquid passage into said mixing zone. 
     
     
         5 . The catalytic cracking system of  claim 1  in which said steam inlet communicates with said mixing zone through a side wall of said pipe formed nozzle body. 
     
     
         6 . The catalytic cracking system of  claim 1  in which said liquid deflection member has a closed downstream end which defines said internal impingement surface against which liquid hydrocarbon directed through said central liquid passage impinges. 
     
     
         7 . The catalytic cracking system of  claim 6  in which said impingement surface is defined by said plurality of said liquid injector discharge orifices.