Externally mixing multi-component nozzle

Abstract

An externally mixing multi-component nozzle for spraying fluids with the assistance of an atomizing gas that is hot in relation to the fluids to be sprayed, said the gas particularly being steam or hot gas. The nozzle has a housing, wherein the housing has an outlet orifice for the atomizing gas, a first annular gap for fluid to be sprayed, surrounding the outlet orifice, and a second annular gap for the atomizing gas, surrounding the first annular gap, as well as a manifold. The manifold has at least one flow channel for fluid to be sprayed, from a connecting line to the first annular gap, and at least one flow channel from an atomizing gas connecting line to the outlet orifice for atomizing gas.

1 . An externally mixing multi-component nozzle for spraying fluids with the aid of an atomizing gas, especially steam or hot gas, which is hot in relation to the fluids to be atomized, with a housing, wherein the housing has a discharge opening for the atomizing gas, a first annular slot, encompassing the discharge opening, for fluid to be atomized, and a second annular slot, encompassing the first annular slot, for the atomizing gas, and also a distribution piece, wherein the distribution piece has at least one flow passage for fluid to be atomized from a connecting line to the first annular slot and at least one flow passage from an atomizing gas connecting line to the discharge opening for atomizing gas. 
     
     
         2 . The externally mixing multi-component nozzle as claimed in  claim 1 , wherein the housing has an annular passage for atomizing gas which encompasses the distribution piece at least in sections. 
     
     
         3 . The externally mixing multi-component nozzle as claimed in  claim 2 , wherein the flow passage of the distribution piece for the atomizing gas originates from the annular passage. 
     
     
         4 . The externally mixing multi-component nozzle as claimed in  claim 1 , wherein a thermal insulation is provided, at least in sections, between the flow passage for fluid to be atomized and the distribution piece. 
     
     
         5 . The externally mixing multi-component nozzle as claimed in  claim 4 , wherein the flow passage for fluid to be atomized is formed, at least in sections, by means of a tube which is inserted into the distribution piece. 
     
     
         6 . The externally mixing multi-component nozzle as claimed in  claim 5 , wherein an air gap is provided, at least in sections, between the tube and the distribution piece. 
     
     
         7 . The externally mixing multi-component nozzle as claimed in  claim 1  wherein the connecting line for fluid to be atomized is of double-walled design at least in the connecting region to the distribution piece. 
     
     
         8 . The externally mixing multi-component nozzle as claimed in  claim 1 , wherein a thermal insulating layer is provided between the first annular slot and the housing and also between the first annular slot and the second annular slot. 
     
     
         9 . The externally mixing multi-component nozzle as claimed in  claim 1 , wherein the discharge opening for atomizing gas has the form of a third annular slot. 
     
     
         10 . The externally mixing multi-component nozzle as claimed in  claim 1 , wherein the boundary of the first annular slot, as seen in the flow direction, is arranged in front of an outer boundary of the second annular slot 
     
     
         11 . The externally mixing multi-component nozzle as claimed in  claim 10 , wherein the boundary of the first annular slot is arranged by one to ten times the width of the first annular slot in front of the outer boundary of the second annular slot, as seen in the flow direction. 
     
     
         12 . The externally mixing multi-component nozzle as claimed in  claim 1 , wherein at least the distribution piece is formed from a material, especially high-alloy high-grade steel, with a coefficient of thermal conductivity which is significantly reduced, especially by the factor of  8 , compared with brass. 
     
     
         13 . The externally mixing multi-component nozzle as claimed in  claim 1 , wherein a section—g directly upstream of the discharge opening—of the flow passage for atomizing gas in the housing first of all tapers and after passing a constriction widens again up to the discharge opening, as seen in the flow direction.