Continuous casting nozzle blockage is a problem encountered by many steel mills, which not only increases the maintenance workload, but also seriously aff

　　Continuous casting nozzle blockage is a problem encountered by many steel mills, which not only increases the maintenance workload, but also seriously affects the process quality, causes accidents and affects the cost. Generally speaking, the following approaches can be considered to solve the problem:

　　(1) Strengthening filtration and water treatment is still the basis. First, strengthen filtration and water quality control in the water supply system. But this is not enough, but also in the valve chamber after the simple parallel double filter, its advantages are:

　　1) Pressure gauge before and after, whether the filter is blocked at a glance;

　　2) It does not occupy operation time when cleaning is needed;

　　3) It is very convenient to clean.

　　It is very important to use the nozzle, you can consider adding a filter at the nozzle junction or nozzle entrance. This can solve the valve chamber pipe corrosion and prevent accidental fall into debris during maintenance.

　　(2) Choose a nozzle with good wear resistance. From the use of a factory, the original nozzle must be removed for half a month to clean, reinstall most of the bad use. After replacement, in the same water supply conditions can be used for 3~4 months without blockage, without damage. The reason is related to the good abrasion resistance and hard bonding of the inner cavity surface of the new nozzle. Has analyzed the nozzle blockage, mainly iron oxide, calcium oxide and silicon oxide, these materials like cement, paint, constantly in the nozzle cavity bonding, accumulation superposition, and eventually blocked the nozzle.

　　(3) the use of large through hole nozzle: the same flow but different production plant nozzle through hole is not the same; Nozzle structure is different through hole is also different, such as Japan spray company a new elliptical nozzle, under the same pressure flow, its through hole is two times the ordinary elliptical nozzle widely used in slab, it is not easy to plug. Choose a new nozzle, such as 120. Rectangular nozzle longitudinal layout, used for billet or slab, not only the spray distance can be far, to prevent the nozzle from being damaged or burned, and the coverage area of a nozzle is equivalent to two or more general conical nozzle, a large flow of a nozzle, through the hole, natural not easy to plug.