Recuperator burner

Abstract

Recuperator burner (100;100';300), and at least: - A burner base (10), - a combustion chamber tube (30;330) in which a burner nozzle (41) is positioned with at least one combustion gas pipeline (42,43) opening into the combustion chamber tube, and - an exhaust gas recirculation device comprising a jet pump operated by combustion air, wherein the jet pump draws exhaust gas from the outside of the combustion chamber tube (30;230;330) by an annular drive jet through a jet pump ring gap (26;22 The exhaust gas recirculation device includes a jet nozzle with a decreasing cross-section in the flow direction, which has 6;326) and is formed between the burner base (10) and the combustion chamber pipe (30;230;330) upstream of the mixing plane of combustion gases flowing into the combustion chamber pipe (30;230;330), and includes a circumferentially closed array consisting of at least one endless exhaust gas intake opening (34;234;334) and / or a plurality of exhaust gas intake openings, and exhaust gas At least one flow path from the intake opening leads into the interior of the combustion chamber tube (30;330); in the recuperator burner (100;100';300), a recuperator (20;220;320;400) is provided located upstream of the combustion chamber tube (30;330), and the recuperator has a heat transfer body (21;221) having at least two separate flow channels (101,102;201,202;301,302) provided to guide the backflowing fluid. A recuperator burner (100;100';300) comprising ;321), wherein at least two fluids flow in / out through inlet and outlet openings (23,24;323,324) of a conduit channel (101,102;201,202;301,302) in a heat transfer body (21;221;321), one of the fluids being formed from combustion air to be preheated and the other being formed from exhaust gas from a recuperator burner (100;300).

Claims

1. Recuperator burner (100; 100'; 300), and at least: - Burner base (10), - A combustion chamber tube (30; 330) wherein a burner nozzle (41) is positioned within the combustion chamber tube, having at least one combustion gas pipeline (42, 43) open to it. - An exhaust gas recirculation device comprising a jet pump operated by combustion air, wherein the jet pump includes a jet nozzle with a decreasing cross-section in the flow direction, having jet pump ring gaps (26; 226; 326) for drawing exhaust gas from outside the combustion chamber pipes (30; 230; 330) by an annular driven jet. It includes, The aforementioned exhaust gas recirculation device is: - Formed between the burner base (10) and the combustion chamber tubes (30;230;330) upstream of the mixing plane of the combustion gas flowing into the combustion chamber tubes (30;230;330), - Includes a circumferentially closed arrangement of at least one endless exhaust gas intake opening (34; 234; 334) and / or a plurality of exhaust gas intake openings, wherein at least one passage from the exhaust gas intake opening leads into the interior of the combustion chamber tube (30; 330); In a recuperator burner (100; 100'; 300), A recuperator burner (100;100';300) is provided, wherein a recuperator (20;220;320;400) is located upstream of the combustion chamber tube (30;330), the recuperator comprises a heat transfer body (21;221;321) having at least two separate flow channels (101,102;201,202;301,302) provided for guiding a backflowing fluid, at least two of the fluids flow in / out through inlet and outlet openings (23,24;323,324) of the flow channels (101,102;201,202;301,302) in the heat transfer body (21;221;321), one of the fluids is formed from combustion air to be preheated, and the other is formed from exhaust gas of the recuperator burner (100;300).

2. The recuperator burner (100; 100') according to claim 1, characterized in that the jet nozzle is formed in the combustion air outlet opening (23) of the recuperator (20).

3. - An inner tube (22) having an inner hollow chamber (27) is connected to the base (10), and the inner tube is guided through the combustion chamber tube (30) and / or through the heat transfer body (21); - The combustion air outlet opening (23) of the combustion air passage channel extends around the outer surface of the inner tube (22), - The nozzle of the jet pump is formed on the inside by the inner tube (22) and on the outside by a conical nozzle ring (25), the nozzle ring extends to the outer surface of the inner tube (22) at its tapering end, and the jet pump ring gap (26) is formed between the inner tube (22) and the nozzle ring (25). - On the outside of the nozzle ring (25), there is at least one exhaust gas inlet opening (24) for the exhaust gas flow channel of the combustion chamber tube (30) and / or the heat exchanger (21). A recuperator burner (100; 100') according to claim 1 or 2, characterized in that it is a recuperator burner according to claim 1 or 2.

4. The recuperator burner (100; 100') according to claim 2, characterized in that the inner tube (22) is located within or in the inlet opening of the educator (32) to which the combustion chamber tube (30) is connected, the inlet opening being larger in diameter than the combustion chamber tube (30), and an annular exhaust gas intake opening (34) is formed between the outer surface of the inner tube (22) and the edge of the inlet opening of the educator (32).

5. - An inner tube (222; 323) having an inner hollow chamber (227; 327) is guided through the heat transfer body (221; 321); - The jet pump ring gap (226; 326) and the exhaust gas intake opening (234; 334) are formed in the inner tube (222) in a section located inside the heat transfer body (221). A recuperator burner (300) according to claim 1, characterized in that it is a recuperator burner (300).

6. - The inner hollow chamber (327) is provided with a conical combustion chamber tube (330) having a burner opening member (331) that extends to just before the end face of the heat transfer body (321); - A flow reversal chamber (328) is formed between the confluence opening (323) of the flow channel (301), which functions as an air supply channel, and the burner nozzle member (331); - A nozzle ring gap (325) is formed between the inner wall of the heat transfer body (321) and the outer wall of the combustion chamber tube (330), and a jet pump ring gap (326) is continued from the nozzle ring gap, the cross-section of which expands in the flow direction; - Starting from the exhaust gas intake opening (334) on the outside of the heat transfer body (321), a first flow path directly leads to the jet pump ring gap (326), and another path leads to one of the flow channels (302) that function as exhaust gas suction channels in the heat transfer body (321), - The jet pump ring gap (326) extends to the deflection point (351) at the open rear end of the combustion chamber tube (330). The recuperator burner (300) according to claim 5, characterized in that it is the same as the one described in claim 5.

7. The recuperator burner (300) according to claim 6, characterized in that the burner nozzle member (331) is positioned in front of the confluence opening (323) of the flow channel (301) which functions as an air supply channel and is located on the inside, and is connected to the heat transfer body (321) such that the exhaust gas intake opening (334) located on the outside of the heat transfer body (321) is exposed on the outside of the burner nozzle member (331).

8. The recuperator burner (300) according to claim 6 or 7, characterized in that the burner nozzle member (331) is provided with a notch in the region of the flow reversal chamber (328).

9. The recuperator burner (100; 300) according to at least one of claims 1 to 8, characterized in that the opening of the jet pump ring gap (26; 326) is located inside the cross-section of the endless exhaust gas inlet opening (34; 324), or inside the cross-section of the closed arrangement of a plurality of exhaust gas suction openings.

10. The recuperator burner (100; 300) according to at least one of claims 1 to 9, characterized in that the jet pump ring gaps (26; 226; 326) and / or the exhaust gas intake openings (34; 234; 334) each have a meander-shaped extension.

11. A recuperator burner (100') according to at least one of claims 1 to 10 is provided, comprising another exhaust gas recirculation device (400) which is operated by a jet pump that is powered by a mixture of combustion gas, combustion air, and recirculated exhaust gas obtained by the jet pump of the first exhaust gas recirculation device, wherein the jet pump is formed downstream of the mixing plane of combustion gas flowing into the combustion chamber, prior to the opening of the combustion chamber pipe (30).

12. The recuperator burner (100') according to claim 11, characterized in that the other exhaust gas recirculation device (400) is positioned in front of the burner opening cone (31) of the burner (100') in the flow direction and is arranged together with the combustion chamber pipe (30) in a single common jet pipe (401).

13. The recuperator burner (100') according to claim 11 or 12, characterized in that the other exhaust gas recirculation device (400) includes a venturi nozzle module (402), the inlet opening of the venturi nozzle module being located behind the burner cone (31).

14. A recuperator burner (100') according to any one of claims 11 to 13, characterized in that at least one segmented flame tube (403) is provided in the jet tube (401) downstream of the venturi nozzle module (402).

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