Automatic control design for gasification furnace
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Is the sequential control program in the gasification furnace implemented using DCS or PLC? Which one is better?
It is usually done within the DCS, as the gasification unit involves many analog signals that need to be processed in addition to the lockhopper sequencing control; lockhopper sequencing control is just a simple program, so there is no need to use a separate PLC for it. It is easy for any mature DCS to complete this procedure.
Strictly speaking, the sequential control of the gasifier should be placed in the SIS. The lockbox can be placed in the DCS.
If it’s too far, using a PLC might be an option
For the sequential control of the gasification furnace, a DCS is sufficient; there is no need to add a PLC in addition to the DCS
DCS will do; the gasification furnace is controlled using a DCS system, so it’s sufficient to carry out sequential control within that system – there’s no need to use a separate PLC.
Whatever works; just choose based on the situation on site
I didn’t see any case where PLCs are used for the sequential control of lock hoppers, as this type of sequential control is considered basic and quite simple; no additional investment in PLCs is required