| 摘要 |
PURPOSE:To prevent the development of corrosive drain in blast furnace gas in a recovery apparatus for the blast furnace gas by arranging a dew-point instrument and a thermometer at outer sides of an exhaust gas turbine and a septum valve, respectively and controlling a heating device and a water spray device, so as to become to higher temp. of the blast furnace gas than the dew- point by the setting temp. CONSTITUTION:In the recovery apparatus for the blast furnace gas, the dew- point and temp. for the blast furnace gas is measured by the dew-point instrument 22 and the thermometer 24 and these measured values are inputted to a fuel controller 26 and water flow controller 28. These controllers are worked, so that the temp. of blast furnace gas becomes to higher than the dew-point by the pre-inputted setting temp. That is, the controller 21 controls fuel and air quantities for the heating device 16 and the controller 28 controls water quantity for the water spray device 18 through a valve 20. Therefore, as the temp. of blast furnace gas is become to higher than the dew-point, the corrosive drain is not developed, and corrosions of exhaust gas turbine 8, blast furnace gas piping 12 and devices 14 for using the blast furnace gas are prevented.
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