Burn pit and refractory brick for the burn pit

Abstract

A burn pit includes a burn pit basin, a refractory passage, a burner shaft, and a refractory sleeve. The burn pit basin is delineated by at least a first side wall, a refractory wall, and a second side wall. The refractory passage extends from the burn pit basin through the refractory wall. The burner shaft is disposed within the refractory passage and is configured to deliver a combustible gas to a flare tip structure at the burn pit basin. The flare tip structure ignites the combustible gas to create a flame directed towards the burn pit basin. The refractory sleeve surrounds at least a portion of the burner shaft and is configured to protect the burner shaft from damage caused by the flame.

What is claimed is: 
     
         1 . A burn pit, comprising:
 a burn pit basin delineated by at least a first side wall, a refractory wall, and a second side wall;   a refractory passage extending from the burn pit basin through the refractory wall;   a burner shaft disposed within the refractory passage, wherein the burner shaft is configured to deliver a combustible gas to a flare tip structure at the burn pit basin, wherein the flare tip structure ignites the combustible gas to create a flame directed towards the burn pit basin; and   a refractory sleeve surrounding at least a portion of the burner shaft, wherein the refractory sleeve is configured to protect the burner shaft from damage caused by the flame.   
     
     
         2 . The burn pit according to  claim 1 , wherein the refractory passage is constructed by one or more concrete boxes. 
     
     
         3 . The burn pit according to  claim 2 , wherein each concrete box further comprises:
 two support portions;   two side plates supported on a corresponding support portion in a thickness direction; and   a top plate supported by the two side plates in a length direction, wherein a length of the support portion is equal to a length of the side plate and a width of the support portion is greater than a thickness of the side plate.   
     
     
         4 . The burn pit according to  claim 3 , wherein each concrete box further comprises a lifting hole machined into the top plate. 
     
     
         5 . The burn pit according to  claim 1 , wherein a void between the refractory sleeve and an inner surface of the refractory passage is filled with castable refractory and ceramic fiber material. 
     
     
         6 . The burn pit according to  claim 5 , further comprising a stainless steel backing plate located adjacent to the castable refractory and ceramic fiber material in the void. 
     
     
         7 . The burn pit according to  claim 1 , wherein a refractory brick layer is disposed in a void in the refractory passage between the refractory sleeve and an inner surface of the refractory passage. 
     
     
         8 . The burn pit according to  claim 1 , wherein the refractory sleeve is constructed by two or more sections. 
     
     
         9 . The burn pit according to  claim 8 , wherein two neighboring sections are connected to one another by an expansion joint to form a cylinder. 
     
     
         10 . The burn pit according to  claim 8 , wherein an edge of each of the two or more sections along a longest direction of the section has a Z-like shape. 
     
     
         11 . A method comprising:
 forming a burn pit basin by building a first side wall, a refractory wall, and a second side wall;   extending a refractory passage from the burn pit basin through the refractory wall;   surrounding at least a portion of a burner shaft with a refractory sleeve;   extending the burner shaft having the refractory sleeve through the refractory passage;   transporting a combustible gas through the burner shaft to a flare tip structure at the burn pit basin and igniting the combustible gas using the flare tip structure to create a flame directed towards the burn pit basin; and   protecting the burner shaft from damage caused by the flame using the refractory sleeve.   
     
     
         12 . The method according to  claim 11 , wherein extending the refractory passage through the refractory wall further comprises forming the refractory passage using one or more concrete boxes. 
     
     
         13 . The method according to  claim 12 , wherein forming the refractory passage using one or more concrete boxes further comprises forming one of the one or more concrete boxes by forming two side plates on corresponding support portions in a thickness direction and forming a top plate supported by the two side plates in a length direction, wherein a length of the support portion is equal to a length of the side plate and a width D of the support portion is greater than a thickness of the side plate. 
     
     
         14 . The method according to  claim 13 , wherein forming one of the one or more concrete boxes further comprises machining a lifting hole into the top plate. 
     
     
         15 . The method of  claim 11 , wherein extending the burner shaft having the refractory sleeve through the refractory passage further comprises forming a void between the refractory sleeve and an inner surface of the refractory passage and filling at least a portion of the void with castable refractory and ceramic fiber material. 
     
     
         16 . The method of  claim 15 , wherein filling at least the portion of the void with the castable refractory and ceramic fiber material further comprises installing a stainless steel backing plate against the castable refractory and ceramic fiber material within the void. 
     
     
         17 . The method of  claim 11 , wherein extending the burner shaft having the refractory sleeve through the refractory passage further comprises surrounding the refractory sleeve with a refractory brick layer in a void created between the refractory sleeve and an inner surface of the refractory passage. 
     
     
         18 . The method of  claim 11 , wherein surrounding at least the portion of the burner shaft with the refractory sleeve further comprises forming the refractory sleeve using two or more sections. 
     
     
         19 . The method of  claim 18 , wherein forming the refractory sleeve using the two or more sections further comprises connecting two neighboring sections to one another using an expansion joint to form a cylinder. 
     
     
         20 . The method of  claim 18 , wherein forming the refractory sleeve using the two or more sections further comprises forming an edge of each of the two or more sections along a longest direction of the section in a Z-like shape.