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The influence of spray covered area of nozzle on the temperature of continuous casting billet

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The influence of spray covered area of nozzle on the temperature of continuous casting billet

Date of release:2018-09-08 Author: Click:

1. The spray covered area of the nozzle is small


Such as a steel continuous casting machine nozzle with 30 ° 90 ° * aerosol spray nozzle, the nozzle spray distribution of steamed bread, central water amount is larger, at close range slab of jet nozzle distance, spray coverage area is lesser, nozzle spray coverage directly to the surface of the slab cooling intensity is big, the color of the slab clearly black and affect the internal quality of slab in the middle of the part.



2。 The spray covered area of the nozzle is too large


If choose 30 ° 90 ° * aerosol spray nozzle, the nozzle spray distribution of trapezoid, water is average, nozzle distance slab of the jet distance, spray cover, nozzle spray coverage directly to the surface of the slab cooling intensity decreases, dark spots on the surface of the slab, but because of edge water, cause the spray cooling intensity of cover edge is too large, the heat generated in the edge stress also increased, subsequently led to the slab cracks on the parts.



3. Prevent nozzle blockage


Nozzle clogging is a tricky problem for continuous casting. In particular, special steel, because of the lower water ratio, some of the nozzle orifices smooth diameter less than 1mm. Continuous casting two cold water for circulating water, contain a certain amount of oil and suspended solids, particulate matter, in the process of continuous casting production by high temperature baking, production environment is very bad, in extreme cases a cast is not over yet, nozzle occurs partly blocked, cause deformation of the spray shape of nozzle, affect the surface of the casting billet cooling, resulting in continuous casting billet internal quality problems. Improved water quality can effectively solve nozzle blockage, but the cost of water treatment needs to be increased. Improving the structure of the nozzle can also solve the problem of nozzle clogging. The continuous casting machine of a steel company adopted the color photo of the surface of the continuous casting billet produced normally after "continuous casting online cleaning" of the nozzle.



The quality of the nozzle technology in the secondary cooling zone of dab continuous casting is one of the important factors affecting the surface and internal quality of dab. In addition to the specific water amount in the secondary cooling zone, the water distribution in each segment (region, loop), and the selection and arrangement of nozzles, we should also pay attention to "nozzle cover" in terms of surface temperature and heat transfer of billet. For the continuous casting machine arranged according to the clamping roller in the line of the dense line, attention should be paid to optimize the spray cover of the nozzle. The spray covered area of the nozzle is small or too large, which will affect the surface temperature and heat transfer of the blank. There are many ways and means to prevent nozzle blockage, among which "continuous casting cleaning" nozzle is a simple and easy way and method.

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