| 摘要 |
PURPOSE: To suppress the temperature of flames to reduce the NOx generation rate by a method wherein the front end openings of a pair of ventilation passages being provided across a fuel feeding passage which is provided at the center in a burner main body are drawn and made into ejectors, and by doing so, one part of the exhaust gas is drawn to a recessed part on the combustion air side, and is burned by mixing with the combustion air. CONSTITUTION: Ventilation passages 3a, 3b are provided on the right and left across a fuel feeding passage 2 being provided at the center in a burner main body 1, and a heat accumulating element filled chamber 4 is inserted in respective ventilation passages 3a, 3b. Then, by heat which is recovered from a high temperature exhaust gas being drawn from one of the ventilation passages, the pre-heating of combustion air which passes through the other ventilation passage is performed. In this case, the front ends of respective ventilation passages 3a, 3b are drawn, and openings are formed on the rear end surfaces of right and left recessed parts 5a, 5b being formed on the furnace internal wall surface, and ejectors 7 are formed. Also, the rear ends of both recessed parts 5a, 5b communicate with each other by a connecting path 6. Then, one part of the exhaust gas from the recessed part on the exhaust gas side is drawn by the momentum of the combustion air which passes through the ejectors 7, and is jetted while mixing with the combustion air. |
