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However, the ladle drying programs developed in some plants have not been soundly based and opinions on the maximum temperature at the boundary of the lining working and reinforcing layers at the moment of completion of drying have been contradictory.
We should also turn our attention to the long drying time, which involves significant losses of heat in combustion of gas in the ladle.
The efficiency of existing drying equipment based on gas burners has been determined as not more than 5% [i].
The basic reasons for the low effectiveness of drying of linings by the products of gas combustion are the result of the drying method itself.
The input of heat to the moist surface from the high-temperature flame of the burning gas creates high gradients of temperature, capillary or chemical potential, and pressure of the stream-air mixture in the pores of the lining surface layer.
Under the action of temperature and pressure gradients, filtration transfer of moisture in the form of water and steam into the depth of the lining predominates over diffusion mass transfer to the open surface of the lining under the action of the capillary or chemical potential gradient.
However, the ladle drying programs developed in some plants have not been soundly based and opinions on the maximum temperature at the boundary of the lining working and reinforcing layers at the moment of completion of drying have been contradictory.
We should also turn our attention to the long drying time, which involves significant losses of heat in combustion of gas in the ladle.
The efficiency of existing drying equipment based on gas burners has been determined as not more than 5% [i].
The basic reasons for the low effectiveness of drying of linings by the products of gas combustion are the result of the drying method itself.
The input of heat to the moist surface from the high-temperature flame of the burning gas creates high gradients of temperature, capillary or chemical potential, and pressure of the stream-air mixture in the pores of the lining surface layer.
Under the action of temperature and pressure gradients, filtration transfer of moisture in the form of water and steam into the depth of the lining predominates over diffusion mass transfer to the open surface of the lining under the action of the capillary or chemical potential gradient.