| 摘要 |
PURPOSE:To maintain an exhaust gas at the dew point or above at all times and to prevent the function deterioration of a dry dust collector by providing a cooler to the upper stream side of the dry dust collector and a heater to the down stream side, interposing a heat medium circulating piping between the same and controlling the circulation rate of the heat medium with the top temp. of a blast furnace. CONSTITUTION:The gas cooler 11 is disposed between dry dust collector 3 and a coarse dust remover 2 and the gas heater 12 is disposed between the dry dust collector 3 and a turbine 4. The gas cooler 11 and the gas heater 12 are connected by the heat medium piping 13 and a circulation pump is interposed in the mid-way thereof. The top temp. of the blast furnace 1 is detected by a thermometer 6 before the dry dust collector 3 when said temp. rises to the heat resistant temp. of the dry dust collector 3 or above. The circulation rate of the heat medium of the circulation pump 14 is then adjusted to control the gas temp. so as to prevent said temp. from rising to the heat resistant temp. of the dry dust collector 3 or above. The sensible heat of the top furnace gas which is deprived of in the gas cooler 11 is again applied to the gas side by the gas heater 12 and the energy is recovered by the turbine 4.
|
