Shrouded-coanda multiphase burner

Abstract

A gas flare disposed at an end of a supply pipe member for directing a gas flow to a head member, the flare including a slot for ejecting the gas flow and a shroud. The shroud surrounds the slot, at least part of the base member and at least part of the head member of the gas flare. The shroud directs the ejected gas flow between the shroud and the head member.

1 . A gas flare comprising:
 a supply pipe for directing a gas flow towards a head member;   a slot located between the supply pipe and head member for ejecting the gas flow; and   a shroud spaced away from and surrounding the slot to form a passage between the shroud and the head member for directing the ejected gas flow therebetween, wherein the shroud has an airfoil-shaped longitudinal cross-section with a smooth bottom end and a sharp top edge.   
     
     
         2 . The gas flare of  claim 1 , wherein the shroud prevents the gas flow from being ejected in a substantially radial direction from the gas flare. 
     
     
         3 . The gas flare of  claim 1 , wherein the shroud prevents debris in the gas flow from being ejected from the gas flare. 
     
     
         4 . The gas flare of  claim 1 , wherein the shroud absorbs noise. 
     
     
         5 . The gas flare of  claim 1 , wherein the shroud absorbs a selectable high-frequency band of the noise as the gas is ejected from the slot at a supersonic speed. 
     
     
         6 . The gas flare of  claim 1 , wherein the shroud comprises a porous inner material layer and a solid external metal lining. 
     
     
         7 . The gas flare of  claim 1 , further comprising:
 a base member disposed near a bottom of the head member, wherein the base member is at least partially located within the supply pipe defining a passage therebetween for the gas flow.   
     
     
         8 . The gas flare of  claim 1 , wherein the shroud includes a circumferential serrated rim at the distal end. 
     
     
         9 . A shroud for a gas flare, the shroud being at least partially disposed around a head member of the flare and comprising:
 a proximate end having a generally smooth and rounded shape; and   a distal end having a sharp edge, wherein the shroud and the head member define a passage for directing a gas flow.   
     
     
         10 . A method of combusting a gas flow ejected from a gas flare; the method comprising:
 directing the gas flow from a supply pipe to a head member;   drawing in an ambient air flow into a passage formed by a shroud spaced away from and surrounding at least part of the gas flare;   mixing the gas flow with the ambient air flow; and   combusting the mixture.   
     
     
         11 . The method of  claim 10  further comprising partially disposing the shroud between a shield and the head member, wherein the shield provides a backward noise reduction. 
     
     
         12 . The method of  claim 11  further comprising forming a smooth passage between the shroud and the shield. 
     
     
         13 . A Coanda gas flare for combusting effluent, the gas flare comprising:
 a stalk-shaped base member connected to a tulip-shaped head member, wherein at least part of the base member is located within at least part of a supply pipeline defining a first passage therebetween for directing a gas flow towards the head member; and   a slot located between the supply pipeline and the head member, substantially adjacent to where the head member is connected to the base member, wherein the slot is surrounded by a shroud defining a second passage therebetween for directing the gas flow substantially around the tulip-shaped head member to be combusted.