| Autor: |
Kalganov, M. V., Zainullin, L. A., Alekseev, A. N., Dzyubailo, R. V., Spirin, N. A. |
| Zdroj: |
Steel in Translation; Jun2024, Vol. 54 Issue 6, p544-548, 5p |
| Abstrakt: |
The article discusses the design of the holding chamber of a continuous mill ball tempering furnace, consisting of similar sections, each of which is equipped with a block-type device. In the holding chamber, a method of organizing convective heat exchange was used through the combined use of jet blowing of the surface of the balls and flat flows of heated combustion products of natural gas in a circulation mode. A description of the design of a single holding section and the features of its operation as part of a continuous furnace is presented. The calculated distribution of heat transfer coefficients on the surface of the balls during jet and flat gas flow around them in the operating mode of the furnace is given. Based on the proposed methodology, an analysis of several thermal operating conditions of a single holding unit was carried out. It has been established that when the temperatures of the charge and the gas flow at the entrance to the working volume are equal, the temperature of the balls decreases from 230 to 229.6°C at the exit from the holding chamber due to heat loss through the conveyor and the furnace walls into the environment. In operating mode, heat loss through the walls of the holding unit was about 3 kW. An increase in gas temperature relative to the temperature at the inlet to the blocks by 1.5°C made it possible to compensate for heat loss to the environment and ensure temperature control of the charge along the length of the holding chamber within the technological requirements. The use of a set of several sequentially installed single sections equipped with block-type devices makes it possible to configure the holding chamber of a ball tempering furnace in a wide range of changes in its productivity. The presented materials can be useful in the development and design of furnaces primarily with a convective type of heat transfer. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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