Continuous casting nozzle blockage is a difficult problem encountered by many steel plants on site, which not only increases the maintenance workload, but also affects the process quality, causes accidents and affects the cost. Generally speaking, the following ways can be considered:
1. Strengthening filtration and water treatment is still the foundation. First, strengthen the filtration and water quality control of the water supply system. However, this is not enough. A simple parallel double filter should be added behind the valve chamber. Its advantages are:
1) Pressure gauges are set at the front and back to make it clear whether the filter is blocked;
2) Do not occupy the operation time when cleaning is required;
3) Cleaning is very convenient.
For nozzles with important applications, it can be considered to add a filter at the joint of the spray pipe or at the inlet of the nozzle. This can solve the corrosion of the pipeline in the valve chamber and prevent sundries from accidentally falling during maintenance.
2. Select nozzles with good wear resistance. From the use of a factory, the original nozzle must be removed and cleaned within half a month, and most of them are not easy to use after reinstallation. After replacement, it can be used for 3-4 months without blockage and damage under the same water supply conditions. The reason is that the inner surface of the new nozzle has good wear resistance and is not easy to bond. It has been analyzed that the blockage of the nozzle is mainly iron oxide, calcium oxide and silicon oxide. These materials, like cement and paint, continue to bond and accumulate in the nozzle cavity, eventually blocking the nozzle.
3. Use nozzles with large through-holes: nozzles with the same flow but different manufacturers have different through holes; The nozzle structure is different, and the through-hole is also different. For example, under the same pressure and flow, the through-hole of a new elliptical nozzle of Japan spray company is twice that of the ordinary elliptical nozzle widely used in slab, and it is not easy to be blocked. Choose a new nozzle, such as 120. Rectangular nozzles are longitudinally arranged for billets or slabs. Not only can the spraying distance be longer to prevent the nozzles from being damaged or burned, but also the coverage area of one nozzle is equivalent to two or more general conical nozzles. The flow of a single nozzle is large and the through-hole is large, so it is naturally not easy to block.
If you are interested in the continuous casting machine, please contact me.
Email: marketing2@hanrm.com; kerrirollingmill@gmail.com.
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