Feed Devices

Processes demand various feeds to be introduced into the column at appropriate locations. The feeds being introduced could be:

• Liquid only
• Liquid and vapor above a packed bed (flashing or suppressed flash) or between the trays
• Vapor only below a packed bed
• Reboiler returns

Liquid-only feed devices are required to introduce liquid into the column, either as feed or as reflux. The liquid is fed into/onto the distributor and its design depends on the distributor type, liquid flow, operation range, degree ofsub-cooling, etc.