Romanjko Y. The increasing of energy-effectiveness of drying and heating of continuous casting tundish by heating system improvement

This thesis is devoted to the study of increasing of energy-effectiveness and properties of drying and heating of continuous casting tundish by improvement of the mode of its heating and by regenerative heating system using. The complex mathematical model of heating preparation of continuous casting tundish with respect to geometrical forms, flue gas movement conditions, heat and mass-transfer in refractory lining was developed. Using this model the complex process of heat and mass-transfer in operating space of continuous casting tundish under heating taking into account the number of burners was studied. The calculation of the drying process for continuous casting tundish allows esti-mate the influence of burners number upon the uniformity of temperature distribution in the lining. The influence of temperature conditions upon the rate and safety of lining drying was studied. The temperature conditions for drying process was proposed. Its du-ration less in comparison with the initial conditions, this allows to decrease natural gas consumption at the expense of total heat decreasing into environmental. It was studied the influence of burners number and heat efficiency of compact heat exchangers of regenerative heating system upon the uniformity of temperature field and fuel consumption to tundish heating. It must be taken into account at definition of the main system parameters at continuous casting tundish heating. The new design of packing for compact regenerator was developed. It allows to reach high heating efficiency at low hydraulic resistance. For the first time the compara-tive analysis of heating functioning of compact regenerator of shaft and cylindrical type was done. The regenerator's packing are the spherical and honeycomb units with square holes. It was established the dependence of heat efficiency and hydraulic resistance of packing upon the regenerator's height, that is defined the range of the compact heat-exchangers using.