| 摘要 |
<p>PURPOSE:To easily recycle worn tuyere at low cost by taking out an inner pipe when the tip part of tuyere retreats from the refractory level by melting loss, inserting it in an outer pipe after plugging the tip part thereof by refractory and eliminating the tip part containing the refractory in the inner pipe by continuation of refining. CONSTITUTION:When the tip part of double pipe tuyere retreats from the outskirt of refractory level by melting-loss caused by burnback phenomenon, the inner pipe 3 is once taken out and the tip opening part is perfectly plugged by disk-like iron-plate 4, and further bar-like refractory 6 coated by mortar 5 on the outside thereof is pushed into the inner pipe 3. Then, the inner pipe 3 is plugged by refractory 6 up to a position, of at least about 5mm (l>=5mm) apart from the tip part position of outer pipe 1 toward outside direction. This inner pipe 3 is inserted in the outer pipe 1 and the pipes 3, 1 are connected with the gas introducing pipe respectively, to reopen the blowing. In this way, at first, the tip part of outer pipe 1 is eliminated in the few heats of blowing and then the cooling gas starts to flow, and next, the tip part of inner pipe containing the refractory 6 is eliminated in few heats of blowing and normal gas flow is recovered at each inner and outer pipes 3, 1.</p> |
