| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a boiler having a heat exchanger coil installed in an exhaust cylinder and thereby provided with a feed water preheater for preheating feed water using heat of exhaust gas, capable of further increasing a heat absorption amount of the heat exchanger coil.SOLUTION: A boiler equipped with a feed water preheater comprises: a boiler 1 heating water; a water feed tank 2 storing boiler water to be fed to the boiler 1; an exhaust cylinder 5 through which exhaust gas discharged from the boiler 1 flows; and a heat exchanger coil 8 having a spiral flow path disposed in the exhaust cylinder 5, preheats the boiler water by the exhaust gas flowing in the exhaust cylinder 5 by passing the boiler water fed from the water feed tank 2 through the heat exchanger coil 8. The boiler with the feed water preheater includes: an inner cylinder 10 preventing the exhaust gas from passing through a central axis portion in the exhaust cylinder 5. The heat exchanger coil 8 is provided in an annular space formed between the inner cylinder 10 and an exhaust cylinder outer frame 9. A flow direction regulation plate 12 is provided on an outer surface of the inner cylinder 10 downstream of an exhaust-gas-flow downstream end portion of the heat exchanger coil 8 to extend toward an outer edge of the exhaust cylinder 5.</p> |
