Inlet nozzle for a degassing vessel for metallurgical melting operating according to the rh method

Abstract

An inlet snorkel for a degassing vessel operating by the RH process. The inlet snorkel is for a degassing vessel for metallurgical melting using the RH process. Gas injection pipes through which inert gas can be introduced into the inlet snorkel are distributed along the axial length of the inlet snorkel, and groove-like guide shapes are provided upstream of these gas injection pipes so as to project into the clear cross section of the inlet snorkel.

1 .- 4 . (canceled) 
     
     
         5 . An inlet snorkel for a degassing vessel for metallurgical melting using an RH process, comprising:
 a plurality of gas injection pipes distributed along an axial length of the inlet snorkel and configured to introduce inert gas into the inlet snorkel; and   a plurality of groove-like guide shapes arranged upstream of the plural gas injection pipes so as to project into an open cross section of the inlet snorkel.   
     
     
         6 . The inlet snorkel according to  claim 5 , wherein the plural groove-like guide shapes are each a refractory material. 
     
     
         7 . The inlet snorkel according to  claim 6 , wherein each of the plural groove-like guide shapes has a thickness D, a depth T, a radius R, and are twisted at an angle α in a direction of a longitudinal axis of the snorkel. 
     
     
         8 . The inlet snorkel according to  claim 7 , wherein the angle α is between 20° and 45°. 
     
     
         9 . The inlet snorkel according to  claim 5 , wherein each of the plural groove-like guide shapes has a thickness D, a depth T, a radius R, and are twisted at an angle α in a direction of a longitudinal axis of the snorkel. 
     
     
         10 . The inlet snorkel according to  claim 7 , wherein the angle α is between 20° and 45°. 
     
     
         11 . A method of providing flow in an inlet snorkel for a degassing vessel for metallurgical melting using an RH process comprising:
 introducing inert gas into the inlet snorkel via gas injection distributed along an axial length of the inlet snorkel;   delivering the inert gas to a plurality of groove-like guide shapes pipes that project into an open cross section of the inlet snorkel upstream of the gas injection, whereby a passive flow guidance is provided;   homogenizing a melt rising in the inlet and emulsified inert gas bubbles by the passive flow guidance by an induced swirling in the rising mixture of the melt and the emulsified insert gas bubbles; and   transporting the emulsified insert gas bubbles away from a refractory wall in a direction of an axis of the inlet snorkel,   wherein each of the plural guide shapes having a thickness D, depth T, a radius R, and are twisted at an angle α from bottom to top in a direction of a longitudinal axis of the snorkel, and the gas bubbles rise in a vicinity of a wall of the inlet snorkel and to a greater extent in a center of the inlet snorkel.   
     
     
         12 . The inlet snorkel according to  claim 11 , wherein the angle α is between 20° and 45.