Determination of Electric Heating Power in the Soaking Section of Strip Steel Continuous Annealing Furnace
For the heat treatment of cold-rolled strip,it is generally divided into main process stages such as heating section,soking section,and cooling section.For the soking section in the heat treatment process,the traditional heating method is gas combustion heating.However,with the increasingly strict national environmental protection policies,the demand for green and low-carbon development of heating technology in the field of cold rolled strip heat treatment is becoming more urgent.Due to the fact that electric heating technology is more energy-efficient and environmentally friendly than gas combustion heating,and has precise temperature control,it is more suitable for the homogenization needs of high-quality strip.Therefore,in the heat treatment process of cold-rolled strip,the homogenization treatment has basically changed to electric heating,aiming to meet the precise control of strip temperature.The traditional design of electric heating power in the soking section relies too much on engineering analogies and lacks systematic theoretical analysis,resulting in the inability of the soking capacity to match the engineering requirements well after the design and selection of electric heating components in the soking section.Insufficient heat sharing ca-pacity cannot meet the process requirements,while excessive heat sharing capacity will result in uneconomical use of electrical energy and an increase in investment costs for electric heating components.In response to the above issues,this article summarizes the experience and short-comings of power selection for electric heating elements,and focuses on proposing a design and selection method for electric heating power based on the principle of thermal balance.The theoretical formula for electric heating element power is derived,and on this basis,the rela-tionship between the power output of electric heating elements in the soking section and related influencing factors is analyzed in depth,aiming to provide reference for the refinement and economy of design in the soking section in the future.
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