| 摘要 |
PROBLEM TO BE SOLVED: To grasp the blocking and bending of the tip of a lance by eliminating the error in the lance length. SOLUTION: In the method for controlling the lance of a refining furnace, a lance 1 consisting of inner and outer pipes 2 and 3 is arranged in a furnace, lance air A is supplied from a pipeline 5 that is connected to the upper end side of the outer pipe 3 of the lance 1 into the outer pipe 3, and at the same time a raw material is supplied from the inner pipe 2 to the lance pipe of the refining furnace. In the method, the flow rate of the lance air in the pipeline 5 is made constant, pressure in the pipeline 5 is measured by a pressure- measuring instrument 6, the length of the lance 1 is obtained based on the measurement result, at the same time a CCD camera 7 for picking up the image of the lower end opening of the lance 1 through the inside of the lance is provided at the upper end of the lance 1, the length of the lance 1 is obtained from an image being picked up by the CCD camera 7, and the lance length obtained by measuring the pressure is compared with the lance length obtained from the image being picked up by the CCD camera 7, thus grasping the lance length and the lance state.
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