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A bustle for use on a flare or an exhaust stack of, for example, a landfill gas treatment system, efficiently transfers gas from the stack to a waste heat recovery system associated with the landfill gas treatment system without substantially affecting the operation of the landfill gas treatment pro

A bustle for use on a flare or an exhaust stack of, for example, a landfill gas treatment system, efficiently transfers gas from the stack to a waste heat recovery system associated with the landfill gas treatment system without substantially affecting the operation of the landfill gas treatment process. The bustle enables the heat recovery system to recover at least a portion of the energy within the exhaust produced by the gas treatment system and to provide the recovered energy either indirectly or directly to a secondary process, such as a wastewater treatment process, to thereby reduce the amount of energy needed to be otherwise input into the secondary process.

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1. A stack bustle for use in a gas exhaust system having an exhaust stack, the stack bustle comprising: a circumferential piping section co-extensive with the exhaust stack, the circumferential piping section including an outer wall and an inner wall, the volume between the outer wall and the inner

1. A stack bustle for use in a gas exhaust system having an exhaust stack, the stack bustle comprising: a circumferential piping section co-extensive with the exhaust stack, the circumferential piping section including an outer wall and an inner wall, the volume between the outer wall and the inner wall defining a flow corridor;an orifice disposed within the outer wall of the circumferential piping section, the orifice adapted to be connected to a gas transfer pipe for transferring gas from the circumferential piping section; anda slot disposed within the inner wall of the circumferential piping section, the slot forming a fluid passageway between the exhaust stack and the flow corridor,wherein the flow corridor varies in cross-sectional area circumferentially around the exhaust stack and the cross-sectional area of the flow corridor is widest proximate the orifice. 2. The stack bustle of claim 1, wherein the flow corridor forms a first branch that extends clockwise from the orifice and a second branch that extends counterclockwise from the orifice around the exhaust stack. 3. The stack bustle of claim 2, wherein the first and second branches of the flow corridor meet at a location opposite the orifice and the cross-sectional area of the flow corridor is narrowest at the location opposite the orifice. 4. The stack bustle of claim 1, further including a plurality of slots within the inner wall of the stack bustle. 5. The stack bustle of claim 4, wherein the slots are uniform in area. 6. The stack bustle of claim 5, wherein the slots vary in area. 7. The stack bustle of claim 6, wherein slots opposite the orifice have a greater area than slots proximate the orifice. 8. The stack bustle of claim 1, wherein the orifice is substantially tangent to the flow corridor. 9. The stack bustle of claim 1, wherein the orifice is substantially perpendicular to the flow corridor. 10. The stack bustle of claim 1, wherein the inner wall forms a portion of the exhaust stack. 11. The stack bustle of claim 1, wherein the outer wall forms a portion of the exhaust stack. 12. The stack bustle of claim 1, wherein the slot forms a continuous ring around the exhaust stack. 13. A stack bustle for use in a gas exhaust system having an exhaust stack, the stack bustle comprising: a circumferential piping section co-extensive with the exhaust stack, the circumferential piping section including an outer wall, an inner wall, a top wall and a bottom wall, the outer wall and the inner wall being spaced apart from one another and the top wall and the bottom wall being spaced apart from one another, the inner, outer, top and bottom walls together forming a flow corridor, the inner, top, and bottom walls being located inside the exhaust stack,an orifice disposed in the outer wall to transfer exhaust gases out of the flow corridor, andan opening in the bottom wall, the opening forming a fluid passageway from the exhaust stack into the flow corridor,wherein the circumferential piping section includes an open middle portion through which exhaust gas in the exhaust stack may flow, bypassing the flow corridor, and wherein the opening in the bottom wall is located laterally outward of the open middle portion. 14. The stack bustle of claim 13, wherein the bottom wall includes an angled portion leading into the opening. 15. The stack bustle of claim 14, wherein the angled portion angles the bottom wall upward towards the top wall from the outer wall towards the inner wall. 16. The stack bustle of claim 12, wherein the opening forms a continuous ring. 17. The stack bustle of claim 12, wherein opening varies in width circumferentially. 18. The stack bustle of claim 17, wherein the opening is widest at a location opposite the orifice. 19. The stack bustle of claim 18, wherein the opening is narrowest proximate the orifice.