Determination of main air low-flow self-preservation value

Given by the design institute. This value is usually very low.

It is established based on the safe operation of the main fan. If the \"low low main air volume auto-protection\" function is active, the auto-protection system will activate automatically to protect the fan; all related auto-protection mechanisms will be engaged, and the main fan will enter a safe operating mode (the anti-surge valve at the main fan outlet will open automatically and quickly, the two check valves at the outlet will close on their own, and the butterfly valve at the smoke exhaust fan inlet will close)； The butterfly valve at the main fan inlet and the smoke damper remain in their original states), while the unit enters the material cut-off and bed cooling procedure (the feed is cut off, the two types of valves are shut off, the main air supply is cut off, and all four safety valves come into action; these safety valves quickly assume their protective positions), which is primarily aimed at ensuring the safe operation of the unit.