Hydraulic jet flash mixer with gas diffusion port in the flow deflector

Abstract

A invention chemicals in the form of gases, into a fluid stream. The mixing system withdraws a side stream of fluid from a main fluid stream. The side stream is pressurized and directed through a convergent nozzle, producing a high-velocity jet. This jet is directed onto a deflector plate located on the center line of the conduit that carries the main fluid stream and is thereby diverted in the radial directions normal to the flow direction of the main fluid stream. The deflector is provided with an gas diffudion port for injecting the chemicals that are to be mixed into the main stream. The even distribution of the injected chemicals is ensured by the hydrodynamic forces generated by the flow of the high-velocity jet over the deflector.

1 . Apparatus for injecting and mixing chlorine gas into a stream by flash mixing comprising: 
 a) a conduit for carrying the liquid stream without chlorine gas in a first direction;    b) Injection means having an outlet for injecting a fluid stream into the liquid stream;    c) means for drawing off a portion of the liquid stream from a predetermined position along the conduit and for supplying the drawn-off portion to the injection means to form the fluid jet stream;    d) a deflector disposed proximate to and in front of the outlet for deflecting the fluid stream in a second direction transverse to the first direction of the liquid stream, the deflector having a central axis and a passage coincident with the central axis, the passage having an opening at a position of the deflector which is closest to the outlet, for introducing the chlorine gas into the fluid jet stream such that the chlorine gas is carried in the second direction by the deflected fluid jet stream for mixing into the liquid stream: and    e) means for conveying the chlorine gas under pressure into the passage, wherein the predetermined position is upstream of the deflector, such that the conduit is adapted for carrying the liquid stream with the chlorine gas mixed therein away from the deflector, thereby avoiding back    
     
     
         2 . The apparatus of  claim 1 , wherein the deflector comprises a conical form, having a base and a vertex, the vertex being proximate to the outlet and the opening being within a tip located at the vertex.  
     
     
         3 . The apparatus of  claim 2 , wherein the tip is compromised of a solid hemisphere attached to a tube that in turn is attached to the passage coincident with the central axis, the tube having a multiplicity of ports that allow chlorine gas to flow out of the conduit running through the deflector and into the space between the tip and the body of the deflector.  
     
     
         4 . The apparatus of  claim 3 , wherein the end of the passage coincident with the central axis is in communication with the means for conveying the chlorine gas.  
     
     
         5 . The apparatus of  claim 4 , wherein the base of the tip's hemisphere has a larger diameter that the diameter of the deflector's vertex; and the base of the tip's hemisphere is curved in toward the central axis of the deflector.  
     
     
         6 . The apparatus of  claim 5 , wherein the injection means for injecting injects the fluid jet stream in the first direction.  
     
     
         7 . The apparatus of  claim 5 , wherein the injection means for injecting comprises a high-velocity jet nozzle at the outlet thereof.  
     
     
         8 . The apparatus of  claim 5 , wherein the injection means for injecting and the deflector central axes which are aligned.  
     
     
         9 . The apparatus of  claim 5 , wherein the deflector has a shape such that the fluid jet steam is deflected in a symmetrical pattern.  
     
     
         10 . The apparatus of  claim 5 , wherein the second direction is normal to the first direction.  
     
     
         11 . The apparatus of  claim 5 , wherein the deflector is shaped as a surface of revolution about a central axis of the fluid jet stream.  
     
     
         12 . The apparatus of  claim 5 , further comprising a chlorine contact unit downstream of the deflector, wherein the conduit is adapted for carrying the liquid stream with the chlorine gas to the chlorine contact unit.  
     
     
         13 . Apparatus for injecting and mixing gas into a stream by flash mixing comprising: 
 a) a conduit for carrying the liquid stream without gas in a first direction;    b) Injection means having an outlet for injecting a fluid stream into the liquid stream;    c means for drawing off a portion of the liquid stream from a predetermined position along the conduit and for supplying the drawn-off portion to the injection means to form the fluid jet stream;    d) a deflector disposed proximate to and in front of the outlet for deflecting the fluid stream in a second direction transverse to the first direction of the liquid stream, the deflector having a central axis and a passage coincident with the central axis, the passage having an opening at a position of the deflector which is closest to the outlet, for introducing the gas into the fluid jet stream such that the chlorine gas is carried in the second direction by the deflected fluid jet stream for mixing into the liquid stream: and    e) means for conveying the gas under pressure into the passage, wherein the predetermined position is upstream of the deflector, such that the conduit is adapted for carrying the liquid stream with the gas mixed therein away from the deflector, thereby avoiding back    
     
     
         14 . The apparatus of  claim 13 , wherein the deflector comprises a conical form, having a base and a vertex, the vertex being proximate to the outlet and the opening being within a tip located at the vertex.  
     
     
         15 . The apparatus of  claim 14 , wherein the tip is compromised of a solid hemisphere attached to a tube that in turn is attached to the passage coincident with the central axis, the tube having a multiplicity of ports that allow gas to flow out of the conduit running through the deflector and into the space between the tip and the body of the deflector.  
     
     
         16 . The apparatus of  claim 15 , wherein the end of the passage coincident with the central axis is in communication with the means for conveying the gas.  
     
     
         17 . The apparatus of  claim 16 , wherein the base of the tip's hemisphere has a larger diameter that the diameter of the deflector's vertex; and the base of the tip's hemisphere is curved in toward the central axis of the deflector.  
     
     
         18 . The apparatus of  claim 17 , wherein the injection means for injecting injects the fluid jet stream in the first direction.  
     
     
         19 . The apparatus of  claim 17 , wherein the injection means for injecting comprises a high-velocity jet nozzle at the outlet thereof.  
     
     
         20 . The apparatus of  claim 17 , wherein the injection means for injecting and the deflector central axes which are aligned.  
     
     
         21 . The apparatus of  claim 17 , wherein the deflector has a shape such that the fluid jet steam is deflected in a symmetrical pattern.  
     
     
         22 . The apparatus of  claim 17 , wherein the second direction is normal to the first direction.  
     
     
         23 . The apparatus of  claim 17 , wherein the deflector is shaped as a surface of revolution about a central axis of the fluid jet stream.