Bending prevention device of blast furnace coal injection lance_

摘要

The present invention relates to a blast furnace pulverized coal injection lance bending device for preventing the warp of the pulverized coal injection lance to prevent the warpage of the pulverized coal injection lance by detecting a rise in heat load due to the deterioration of breathability of the pulverized coal injection lance in advance, the surface of the pulverized coal injection lance (17) The temperature sensor 8 mounted on the outer circumferential surface of the inner tube to continuously measure the temperature and send the measurement data to the control device 9, and oxygen for cooling the pulverized coal injection lance and burning the pulverized coal into the pulverized coal injection lance 17. It is installed in the oxygen supply pipe 14 to supply and is operated to prevent the reverse flow of oxygen, the check valve 13 which is opened and closed several times by the control device when the measured temperature rises, and when the measured temperature gradually rises above the specified value, pulverized coal injection Controlled by the control device 9 to supply compressed air to remove the pulverized coal attached to the lance tip 12 of the lance, the oxygen supply pipe ( Control device 9 for opening and closing the solenoid valve 10 and the check valve 13 in accordance with the solenoid valve 10 installed in the compressed air supply pipe 11 connected to the 14, and the measured temperature signal from the temperature sensor 8; ) Is made.;According to the present invention, the pulverized coal injection lance softens or bends by continuously measuring the surface temperature of the pulverized coal injection lance for blowing pulverized coal into the blast furnace and immediately supplying high pressure air or oxygen to flow smoothly when an abnormal condition is detected. It can prevent the damage of equipment and reduce the maintenance cost.