| 摘要 |
PROBLEM TO BE SOLVED: To provide a boiler device, and its operation method reducing thermal NOx, eliminating substantial cost increase, and securing safety during operation without causing increase in unburned components and deterioration of boiler efficiency due to lowering of a reaction rate of fuel. SOLUTION: In the boiler device, an air port 7 is provided in a downstream side of a burner 6 in a furnace 1, a water-water vapor spray nozzle is installed in the air port 7, water vapor of an amount within a range of two to five percent of fuel consumption is sprayed when spraying water vapor from the spray nozzle, and when spraying water from the spray nozzle and water is sprayed of a spray amount not lowering a maximum gas temperature during water spraying by 100 degrees or more in comparison with the temperature when not spraying water in a horizontal cross section of a furnace interior, an NOx concentration and an unburned content concentration in fuel gas can be lowered. COPYRIGHT: (C)2007,JPO&INPIT
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