| 摘要 |
The present invention relates to a boiler which comprises a heat exchanger, such as a super-heater or a re-heater, and reduces temperature variation of combustion gas flowing in a heat exchange unit where a heat exchange occurs in the boiler. The boiler comprises a combustion unit (200) having a burner (210) which supplies air and fuel for burning fuel and air; a nozzle unit (300) which is connected to the combustion unit (200) and tapered toward the flow direction of combustion gas; a heat exchanger unit (400) having a heat exchanger (410) which is connected to the nozzle unit and wherein water is heated by the flowing combustion gas to be steam. At least one among the combustion unit (200), the nozzle unit (300), and the heat exchange unit (400) reduces temperature variation of the combustion gas flowing in the heat exchange unit (400). By these components, the invention prevents the vortex of the combustion gas in the heat exchange unit wherein the heat exchange between the combustion gas and the heat exchanger occurs. The present invention reduces the temperature variation of the combustion gas in the heat exchange unit of the boiler and prevents a pipe wherein the steam flows from bursting. [Reference numerals] (AA) Fuel;(BB) Air;(CC) Combustion gas;(DD) Exhaust gas |
