Chemical Tower Internals Stainless Steel Water 304 Liquid
Distributor 1.Liquid distributor Liquid distributor is the most important column internal from a
process point of view. It is required to distribute liquid
uniformly at the top of packing tower. Meanwhile a liquid
distributor must have sufficient gas passage area to avoid high
pressure drop or liquid entrainment. 2. Technical Parameter of Liquid Distributor Column Diametermm | Specific liquid loadM3/m2*h | System fouling tendency | Turndown ratio | Suitable type of liquid distributor | 250 - 900 | 0.75 - 5 | Low - medium | ＜10:1 | Trough type liquid distributor with sumpDeck type liquid distributor with orifices on drip tubes | 5 - 30 | Low - medium | 2:1 | Pan type liquid distributorTrough type liquid distributor with sump | ＞30 | Low - medium | 2:1 | Pan type liquid distributorTrough type liquid distributor with sumpDeck type liquid distributor | ＞900 | 0.75 - 5 | Low - medium | ＜10:1 | Trough type liquid distributor with parting boxDeck type liquid distributor with orifices on drip tubes | 5 - 30 | Low - medium | 2:1 | Trough type liquid distributor with sumpTrough type liquid distributor with parting boxDeck type liquid distributor | ＞30 | Low - medium | 2:1 | Deck type liquid distributorTrough type liquid distributor with sump |
3. How to choose chemical tower internal water distributor? When we need to select a liquid distributor, we need to consider
the tower diameter, flow rate, turndown ratio, available height (in
case of revamp) and fouling resistance.Weir type gravity distributor:Generally speaking, the weir type gravity distributor is one of the
least troublesome distributors. It has excellent trundown
capability and can handle large liquid load. However it can usually
provide only a limited number of drip points (minimum 30 number of
weirs per m2). It is also extremely sensitive to levelness and
liquid surface agitation.Orifice type gravity distributor:Usually it shows as pan type, deck type or tunnel (trough) type. An
orifice pan distributor consists of a pan. There are circular or
rectangular risers for vapor flow and perforation for liquid flow
in the pan.Orifice trough type distributors consist of parallel troughs with
perforated holes in the bottom for liquid flow. Vapor rises in the
space between the troughs. The troughs are often interconnected by
cross channels (called as parting box), which help equalize the
liquid level in different troughs. This trough type liquid
distributors provide more open area for vapor flow and is easier to
support.Orifice type distributor can be designed to have a large number of
drip points to provide superior liquid distribution, though it may
suffer from corrosion and plugging. Orifices are sized to maintain
a minimum liquid head at desired turndown conditions & to avoid
distributor overflow during turn up condition. Very small orifice
diameters (<4mm) are avoided to prevent fouling. 4.Characteristics distributor: 1.Uniform liquid distribution;
2.Resistance to fouling
3.Proper trundown capabitity
4.Low gas pressure drop;
5. Minimum height;
6.Higher cross-mixing capabity. 5. Applications of Liquid Distributor 1. Distillation towers,
2. Scrubbing towers,
3. Steam drum,
4. Evaporators,
5. Knockout drum,
6. Sulfuric acid plants,
7. Petrochemical plants,
8. Flue gas desulfurization,
9. Refineries,
10. LNG plants, 6. Chemical tower internal water distributor
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