METHOD AND APPARATUS FOR MEASUREMENT OF THICKNESS OF REFRACTORIES IN FURNACE

摘要

PROBLEM TO BE SOLVED: To precisely measure the thickness of refractories in a furnace by a method wherein elastic waves are transmitted from the outside surface of the refractory toward the inside, a gate is set near the time corresponding to the profile of the refractory out of a reflected signal and the reflected signal is extracted from the inside surface of the refractory. SOLUTION: A shallowly inserted thermometer 4 and a deep inserted thermometer 5 are buried at a prescribed interval in the thickness direction of a refractory brick 3 near the outside surface 3a of the refractory brick 3 which is piled up via a stamp material 2 at the inside of the iron skin 1 of a blast furnace. An output signal is given to a computing unit 6. The profile of the refractory brick is estimated. Elastic waves are transmitted from a transmitter-receiver 8 which is installed at outside of the iron skin 1. Reflected waves from the inside end face of the refractory brick are received. A computing unit 14 sets a gate near the time corresponding to the profile of the refractory brick out of a received reflected signal. A correlation between the reflected signal inside the gate and a reflected-signal estimation model calculated by a computing unit 7 is processed. The thickness of the refractory brick is calculated on the basis of the correlation.