Is a mechanical interlock in the air circuit between the lockhopper inlet valve and the lockhopper outlet valve necessary?
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Is a mechanical interlock in the air circuit between the lockhopper inlet valve and the lockhopper outlet valve necessary?
What does hard interlock in the gas circuit refer to?
There is a switch on the air circuit; it’s equivalent to two valves that cannot be opened simultaneously
Uh, I see. What’s the point of this? Just implement it in DCS – this function can be easily achieved in DCS.
There’s no need for that; there’s a chain linkage on the DCS, so the pressure can’t be fully released, and neither the upper nor the lower valve can be opened.
This is like having double insurance; otherwise, if the interlock system fails, the consequences can be severe
What is hard interlocking? Don’t all inlet and outlet valves have valve position interlock functions? How serious are the consequences? Give an example.
Generally, interlocking is done within the system!
What you mean is the design related to the gas circuit – it requires that the inlet valve and the outlet valve cannot be opened at the same time; they can either both be closed or only one of them can be opened. This kind of design is not used very often these days. We once had this idea, but such a mechanism would prevent the inlet valve and the outlet valve from being opened simultaneously when there is no pressure in the gasifier. Actually, there is a valve interlock design in DCS that eliminates the need to implement it in the gas circuit
Theoretically, a hard-wired gas circuit is safer. .