NewTianjin - liquid distributors

From a process standpoint, the most important column internals are the liquid distributors. A liquid distributor is required at all locations in the column where an external liquid stream is introduced. In addition to providing a uniform liquid distribution pattern to the top of the packed bed, the distributor must provide sufficient gas passage area to avoid a high-pressure drop or liquid entrainment. The liquid distributor should have a high turndown ratio and be resistant to fouling.


Orifice trough liquid distributor	spray type distributor	Orifice pan liquid distributor


Orifice pan liquid distributor	?400 Orifice trough liquid distributor	?800 Orifice pan liquid collect and redistributor

The table below listes some conventional distributors.

	Orifice ladder liquid distributor	Spray nozzle liquid distributor	Orifice pan liquid distributor	Weir orifice liquid distributor	Orifice trough liquid distributor	Weir trough liquid distributor
Drive force	pressure	pressure	gravity	gravity	gravity	gravity
Distribute capacity	middle	Low to middle	high	high	middle	middle
Load range	low	low	middle	middle	middle	high
Liquid load (m3/m2.h)	0.25~1.5	Wide range	Wide range	Wide range	Wide range	Wide range
Diameter (m)	> 0.45	random	random normal < 1.2	random normal > 1.2	random	random
Resistant of fouling	high	Low to middle	high	middle	low	low
Gas resistance	low	low	high	Low to middle	high	high
Levelness requirement	no	no	yes	yes	yes	yes
Effect on corrosion	high	low	high	high	low	low
Effect on thickness of liquid	no	no	yes	yes	yes	yes
Liquid entrainment	yes	yes	no	no	no	no
Weight	low	low	high	middle	middle	middle

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