| 摘要 |
PURPOSE:To stabilize blowing of pulverized coal into a blast furnace by providing an air purging means for the pulverized coal sticking in a nozzle to the nozzle, measuring the temp. in front of a tuyere and driving the air purging means in accordance with the result of the measurement. CONSTITUTION:The inside wall in the forward end of a nozzle 6 for blowing pulverized coal is vulnerable to sticking of the pulverized coal. An ejector 7 is provided with the outlet at the forward end, which is located in the forward end of the nozzle 6. A thermometer 4 for measuring the temp. of the tuyere 2 of a branch pipe 3 for ventilation is provided in the part of the pipe 3 where the tuyere 2 is visible from the thermometer. A solenoid valve 8 is mounted in the midway of an ejector 7. A control device 5 compares the value measured with the thermometer 4 and a preset reference value, and when the former is higher than the latter, the valve 8 is opened to eject the compressed air from the ejector 7. Therefore, the pulverized coal sticking to the inside wall in the forward end part of the nozzle 7 is removed. |
