Latest development of hydraulic descaling nozzles

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angličtina

The vast majority of steel production is processed by hot rolling nowadays. The steel is heated to high tem-peratures during the process and a crust of iron oxides (scales) is formed on the surface. This crust must be re-moved prior the rolling. The removal takes place in descalers, a row of high pressure flat jet nozzles, where the jets create a water knife that break the crust and washes the scales away. Heat transfer and fluid flow laboratory in cooperation with Institute of Geonics has been developing a nozzle with a pulsating jet that would increase the mechanical (water hammer) effect on the crust of the scales. So far a new fourth generation of hydrodynamic nozzle was developed. The nozzle generates an oscillating solid jet from side to side while maintaining the flatness of the jet. The mechanism of the oscillation is caused by the internal structure of the nozzle without any moving mechanical parts. The efficiency of the hydrodynamic nozzle is studied by the impact pressure measurements and erosion measurements. Comparison is made with conventional descaling nozzle with similar operating parameters.

Spray, descaling, flat jet nozzle, water hammer effect, hydrodynamic nozzle, pressure impact, erosion

RAUDENSKÝ, M.; POHANKA, M.; VOTAVOVÁ, H.; ŘÍHA, Z.; ZELEŇÁK, M.

24. 7. 2018

Chicago

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