Device for incinerating waste gas

Abstract

A device for incinerating waste gases has a combustion chamber, burner for burning waste gas in the combustion chamber, and a tubular conduit extending substantially vertically from the combustion chamber so that products of combustion of the waste gas in the combustion chamber travel vertically upwardly through the tubular conduit, the tubular conduit being composed of a plurality of tubular elements located one above the other and arranged relative to one another so as to form a gap between each two neighboring tubular elements for introducing air into an interior of the tubular conduit through the gaps.

1 . A device for incinerating waste gas, comprising a combustion chamber; means for burning waste gas in said combustion chamber; and a tubular conduit extending substantially vertically from said combustion chamber so that products of combustion of the waste gas in said combustion chamber travel vertically upwardly into said tubular conduit, said tubular conduit being composed of a plurality of tubular elements located one above the other and arranged relative to one another so as to form a gap between each two neighboring tubular elements for introducing air into the interior of said tubular conduit through said gaps.  
     
     
         2 . A device as defined in  claim 1 , wherein said tubular elements have different diameters such that a tubular element with a greater diameter is located above a tubular element with a smaller diameter to form said gap therebetween.  
     
     
         3 . A device as defined in  claim 1 , wherein said tubular elements have a cross section other than circular.  
     
     
         4 . A device as defined  1 , wherein said tubular elements of said tubular conduits are formed so that said gaps are open outside so that the air is aspirated through said gaps from outside inwardly into each of said tubular elements.  
     
     
         5 . A device as defined in  claim 1 , wherein the number, size and position of said gaps are chosen so that the wall temperature of the tubular elements does not exceed a specified value.  
     
     
         6 . A device as defined in  claim 1 , wherein the number, size and position of said gaps are chosen so as to provide the maximize possible dilution of the combustion products before said products exit said tubular conduit.  
     
     
         7 . A device as defined in  claim 1 , wherein the number, size and position of said gaps are chosen so as to ensure the combustion products exceed a specified temperature for a specified duration before said products exit said tubular conduit.  
     
     
         8 . A device as defined in  claim 1;  and further comprising means for forced supply of air through said gaps between said tubular elements.  
     
     
         9 . A device as defined in  claim 1 , wherein an additional tubular enclosure is arranged around said tubular conduit so that air is supplied first in a space between said tubular element and said tubular enclosure and then travels through said gaps into an interior of said tubular conduit.  
     
     
         10 . A device as defined in  claim 1  wherein each of said gaps is subdivided in a circumferential direction by a plurality of partitions which form a plurality of slots and also serve for connecting said tubular elements with one another.  
     
     
         11 . A device as defined in  claim 1 , wherein the partitions of one gap are circumferentially offset relative to the partitions of the other gap.  
     
     
         12 . A ground flare stack for incinerating waste gases, the stack having a lower tubular portion and an upper tubular exhaust portion, comprising: 
 (a) a tubular burn chamber located intermediate the lower and upper portions and having combustion air intakes located below the burn chamber,    (b) one or more pairs of waste gas inlet ports and closure ports, the inlet and closure port of each pair being located on opposing sides of the burn chamber,    (c) a service access port located in the stack at an elevation equal to or below the waste gas inlet ports;    (d) one or more primary burner assemblies fitted within the burn chamber between the inlet and closure ports, the burner assemblies accepting waste gases from the inlet port and discharging waste gases into the burn chamber for mixing with the combustion air for creating exhaust gases; and    (e) the tubular exhaust stack having one or more axially displaced tubular exhaust shells, each upwardly adjacent exhaust shell having a greater diameter than the preceding exhaust shell, the exhaust shells forming a contiguous bore and being concentrically spaced for forming one or more annular inlets for admitting additional annular air into the stack for discharge with the exhaust gases.    
     
     
         13 . The ground flare stack as recited in  claim 12  wherein the annular inlets admit sufficient additional annular air for improved dispersion of the exhaust gases into the atmosphere.  
     
     
         14 . The ground flare stack as recited in  claim 12  further comprising one or more auxiliary burners fitted within the tubular exhaust stack above at least one of the one or more annular inlets, the annular inlets admitting additional annular air as primary combustion air for the one or more auxiliary burners to the stack.  
     
     
         15 . The ground flare stack as recited in  claim 13  wherein each axially displaced tubular exhaust shell has a lower edge at the annular inlet which is fitted with a bell-mouth intake so as to result in an improved intake of additional annular air.  
     
     
         16 . The ground flare stack as recited in  claim 15  wherein the bell mouth intake comprises a hoop of a circular cross-section.  
     
     
         17 . The ground flare stack as recited in  claim 16  wherein the two or more auxiliary burners are fed waste gas from a header.  
     
     
         18 . The ground flare stack as recited in  claim 17  wherein hoop is tubular and has a bore so that the hoop's bore forms the header.