The Process of Heat Exchange in A Piece Batch
Abstract
The most important phenomenon in technical practice, which affects the thermal regime of industrial aggregates, includes, among others, the heat exchange process, which is primarily characterized by the heat trans-fer coefficient. The article analyses the influence of the grain size of the batch and the flow rate of the gaseous heat-carrying medium on the heat transfer coefficient during heating of the batch to the required temperature as a function of time. The experimental measurement was carried out on shaft furnace models.
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Introduction
Metallurgical furnaces are complex mechanized and automated devices. The processes that take place in them are equally complex.
A charge is placed in the working space of the furnace and then the thermal process is started. The essence of this process is heating to a temperature that leads to a change in the state of the batch or to a temperature sufficient for its further processing. To increase the temperature in industrial furnaces, it is necessary to bring heat into the working space of the furnace, or to develop heat directly in the furnace and transfer it to the batch. The thermal regime of these industrial aggregates is very complex, therefore it is necessary to pay due attention to it.
Conclusion
The The value of the heat transfer coefficient from the flowing air to the batch depends on several factors. The grain size of the batch, the uniformity of the distribution of the batch, the inlet temperature of the flowing air as well as the amount of the heat-carrying medium flowing through the batch play a role.
As the particle size of the batch increased, the air flow through the batch also increased, which caused a faster and more homogeneous overheating of the material. In order to achieve more optimal heat transfer at lower grain sizes, it is necessary to ensure a higher air flow in order to achieve comparable heat transfer results between the air and the batch.
In order to increase the overall efficiency of industrial aggregates and reduce the costs associated with the operation of such devices, it is necessary to ensure optimal conditions for the transfer of heat from the heat-carrying medium to the material of the batch, which will also reduce the energy demand of the process and the time required for melting or heating the material to the required technological temperatures.