Abstract
Heating flame furnaces are the main type of furnaces used for heating and heat treatment of metal products in metallurgy and mechanical engineering. In the working chamber of a modern heating furnace, there should be neither high-temperature nor stagnation zones. One of the methods used to provide such combustion conditions is the application of distributed (volumetric) combustion. Owing to this method, heating quality is ensured by creating a uniform temperature field and equivalent heat exchange conditions, regardless of the placement of the charge in the working chamber of the furnace. In this work, we numerically study the volumetric combustion and influences of small- and large-scale recirculation ratios of furnace gases, the influence of temperature fluctuation on the regenerator nozzle, and the working parameters at the starting phase and reverse.
Highlights
Heating furnaces are commonly used to achieve the required product parameters, in metallurgy
By the means of controlled mixing of the combustion components, it is possible to ignite the fuel with any amount of oxidizing agent and to ensure the distribution of combustion along the entire trajectory of the furnace gases; The combustion agents are separated in the fuel combustion plant, have no more than 10%
Difference in the flow momentum of the fuel and the high-temperature air, and the length of the volumetric heat release zone is equal to the length of the gas path in the furnace; The specific furnace gas energy provides global internal furnace gas recirculation in the range
Summary
Heating furnaces are commonly used to achieve the required product parameters, in metallurgy. To ensure the quality of the final product, a good knowledge of the thermal history of the workpiece is needed. The efficiency of the heating cycles can be evaluated by the following main parameters: the center of the ingot should reach a suitable temperature to avoid high gradients of temperature between the surface and the center during heating; the microstructure should be controlled and homogeneous; and the heating plan should ensure that the thermal stresses are sufficiently low [1]. The heat transfer from the furnace to the material, which depends essentially on the temperature distribution inside the furnace, significantly affects the quality of the final product [2]
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