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Trough Type Liquid Distributor Used In 60 % Methenal Distillation Tower
1. Trough Type Liquid Distributor introduction,
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. Some Liquid Distributor Types:
| Column Diameter inches | Specific liquid load gpm/ft2 | System fouling tendency | Turndown ratio | Suitable type of liquid distributor |
| 10-36 | 0.3 - 2 | Low - medium | ＜10:1 | Trough type liquid distributor with sump Deck type liquid distributor with orifices on drip tubes |
| 2 - 12 | Low - medium | 2:1 | Pan type liquid distributor Trough type liquid distributor with sump | |
| ＞12 | Low - medium | 2:1 | Pan type liquid distributor Trough type liquid distributor with sump Deck type liquid distributor | |
| ＞36 | 0.3 - 2 | Low - medium | ＜10:1 | Trough type liquid distributor with parting box Deck type liquid distributor with orifices on drip tubes |
| 2 - 12 | Low - medium | 2:1 | Trough type liquid distributor with sump Trough type liquid distributor with parting box Deck type liquid distributor Deck type liquid distributor | |
| ＞12 | Low - medium | 2:1 | Deck type liquid distributor Trough type liquid distributor with sump |
3. Two-stage trough type liquid distributor
The two-stage trough type liquid distributor consists of a main trough (primary trough) and a sub trough (secondary trough), and the main trough is placed above the sub trough. The reflux liquid or the feeding liquid enter the main tank through the feeding pipe above the main trough, and then the main trough distributes it to the sub trough in proportion. The structural dimensions of the main trough and the sub trough are determined by the liquid flow rate, the tower diameter and the requirements for the distribution quality. The structure of the two-stage trough liquid distributor is simple, and it is easy to enter the tower from the manhole for assembly. This kind of structure is commonly used in the tower where people can enter for installation, and the tower diameter is more than 800mm.
4. Trough type liquid distributor structure:
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.
5. Trough type liquid distributor production
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