Seeking help from newcomers in transition roles
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The blower is connected to a liquid coupling; when ventilation to a single furnace is stopped, does reducing the inlet air volume also result in a reduction in the coupling pressure? How does the amount of air flow affect the temperature of the coupling? Does an increased oxygen supply lead to too low negative pressure at the inlet?
There is a solution to this problem; if the smelting process is carried out at a steady pace, the hydraulic coupling of the fan can be automatically adjusted to control the elevation of the oxygen lance. The fan can be accelerated once the oxygen lance is lowered, and its speed decreases as the lance is raised. It is best if the fan motor can achieve self-regulation through frequency and speed control. As for the fan inlet pressure during blowing and when not blowing, it should vary; this is generally controlled by the opening degree at the flue dust removal throat, and automation can also be introduced. However, current smelting processes suffer from technical issues and operational problems; at the end of the smelting process, people use thermometers and tools to check the carbon content, and then make an injection (by introducing oxygen once again) at a certain point, which leads to frequent uncertainties in the self-regulation process. For safety reasons, most systems use a single speed and control the opening of the throat to regulate the suction pressure of the fan.
Now, few systems use hydraulic couplings for speed control. Using a fluid coupling for speed control is an option, but fluid couplings have a high failure rate.