Multiple heat recuperation burner system and method

Burner system having

• a burner tube (4) adapted to receive a combustion fuel;
• a first heat exchanger-recuperator (12) positioned to surround said burner tube and having an inlet air duct (8) and a combustion exhaust gas duct (14);
• air inlet means (9, 10) furnishing combustion air to said inlet air duct and for supplying combustion air to the burner;
• exhaust gas conduit means (18, 20) in flow communication with said combustion exhaust gas duct, said first heat exchanger-recuperator preheating air for combustion by the burner by heat exchange with exhaust gases,
• and comprising an additional or auxiliary heat exchanger (25) positioned immediately adjacent to, and downstream of, said first heat exchanger-recuperator (12) to receive combustion exhaust gases from the combustion exhaust gas duct (14) of the first heat exchanger, said additional or auxiliary heat exchanger including means (26) in form of a ring-shaped structure (26), concentric with said first heat exchanger-recuperator (12) for confining a heat carrier medium and for cooling the exhaust gases flowing past said additional or auxiliary heat exchanger (25) prior to entry into the exhaust gas conduit means to a predetermined exhaust temperature.

Burner system having

• a burner tube (4) adapted to receive a combustion fuel;
• a first heat exchanger-recuperator (12) positioned to surround said burner tube and having an inlet air duct (8) and a combustion exhaust gas duct (14);
• air inlet means (9, 10) furnishing combustion air to said inlet air duct and for supplying combustion air to the burner;
• exhaust gas conduit means (18, 20) in flow communication with said combustion exhaust gas duct, said first heat exchanger-recuperator preheating air for combustion by the burner by heat exchange with exhaust gases,
• and comprising
• an additional or auxiliary heat exchanger (25) positioned immediately adjacent to, and downstream of, said first heat exchanger-recuperator (12) to receive combustion exhaust gases from the combustion exhaust gas duct (14) of the first heat exchanger, said additional or auxiliary heat exchanger including means (26) for confining a heat carrier medium and for cooling the exhaust gases flowing past said additional or auxiliary heat exchanger (25) prior to entry into the exhaust gas conduit means to a predetermined exhaust temperature;
• heat carrier medium connection ducts (27) connected to the heat carrier medium confining means for circulating heat carrier medium fluid through the additional or auxiliary heat exchanger (25);
• and parallel connection lines (27a) connected to said connection ducts (27) for parallel connection of further heat exchangers (25) of additional burners in a multi-burner system.