The method of directly introducing steam into pickling solutions for heating is widely used due to its simplicity, ease of implementation, and high heating efficiency. It provides a certain degree of agitation to the pickling solution, accelerating the pickling process and ensuring more uniform pickling. Additionally, it can blow away hydrogen attached to the surface of steel tube blanks, reducing its diffusion into the steel substrate. At the same time, it can also remove impurities adhering to the surface of steel tube blanks, resulting in a cleaner surface.
However, the condensed water in the steam and the moisture generated when steam comes into contact with the pickling solution can lead to a decrease in acid concentration and an increase in acid consumption. Direct steam heating also produces a certain level of noise and vibration, with the former being detrimental to environmental conditions and the latter being harmful to the pickling tank.
