BOILER Russian patent published in 1994 - IPC

FIELD: power engineering. SUBSTANCE: boiler has horizontal gas flue 2. Upper wall of gas flue has holes in which nozzles 3 are mounted for introducing recirculation gases. Nozzles 3 are connected to headers 5. Exit sections of nozzles 3 are brought to gas flue by amount reducing in direction from vertical plane of symmetry of gas flue to its side walls. Nozzles 3 are mounted for independent axial mixing. Headers 5 are independent for each nozzle 3. EFFECT: enhanced efficiency. 2 cl, 3 dwg