| 摘要 |
PURPOSE:To supply an adequate amt. of waste gas having an adequate temp. to a coal grinder in the stage of utilizing the waste gas from a hot stove to the hot air to be supplied to the coal grinder by using mixedly the waste gases on the upper stream and downstream sides of a device for recovering waste heat from the waste gas of the hot stove. CONSTITUTION:The waste gas of a hot stove for a blast furnace is utilized as a hot air source to be supplied to a coal grinder 12 for producing the pulverized coal to be blown to the blast furnace. The high temp. waste gas from an inlet side gas pipe 1A of a device 7 for recovering waste heat from the waste gas of the hot stove and the low temp. waste gas from an outlet side gas pipe 1B are mixed and the gaseous mixture is supplied to the grinder 12. The temp. of the gas in the outlet piping 6 of the grinder 12 is measured with a thermometer 21 and is compared with a prescribed temp. with a temp. controller 41. The setting of a temp controller 46 is adjusted by the output of the controller 41 until the temp. difference is made zero. The controller 46 measures the inlet side temp. of a fan 11 with a thermometer 23, and mixes the low temp. waste gas on the outlet side of the device 7 with the high temp. waste gas by operating a control valve 53 to make the temp. thereof equal to the set temp. of the controller 41, thereby supplying an adequate amt. of the waste gas having an adequate temp. to the grinder 12. |
