Trough - type liquid distributor tower internal design and
manufacturing
We apply the following principles for liquid distribution:
- For clean systems with standard turndown, we use perforations at
the bottom of the distribution troughs;
- For low liquid loads and wide operating ranges, we often use
Orifices, weirs or attached distribution pipes on the sides of
individual troughs;
- For systems where the risk of fouling exists, Overflow distribution
(e.g. via weirs on trough sides) is arranged.
- Overflow drip pipes where the risk for fouling exists.
- Spray nozzles are adopted particularly for pipe type distributors
for solid- free systems
- Combination uses of the above methods.
When assessing liquid distribution design, we must consider several key principles. They depends on the
following requirements:
- Working range
- Liquid properties
- Potential for fouling
- Allowable entrainment
- Liquid load to be distributed
The number of drip points generally ranges between 60-150/m2, depending on the particular application.
Main reference dimensions of spray distributor
| Tower inner diameter/mm | Main tube diameter / mm | Sub tub No. Of each side | Sprayer No. | Flow Rate m3/h |
| 900 | 50 | 0 | 1 | 9.5 |
| 1000 | 50 | 0 | 1 | 13.6 |
| 1200 | 76 | 0 | 1 | 17.7 |
| 1300 | 76 | 0 | 1 | 21.8 |
| 1500 | 76 | 0 | 1 | 27.3 |
| 1800 | 100 | 2 | 7 | 41 |
| 2000 | 100 | 2 | 7 | 54.6 |
| 2400 | 100 | 2 | 7 | 68.2 |
| 2700 | 152 | 2 | 7 | 88.6 |
| 3000 | 152 | 2 | 7 | 109.1 |
Liquid distributor position and simple drawing:
Materials of construction
Tower internals can be made of types of materials. Usually it is
carbon steel or stainless steel. However exotic metals such as
Hastelloy alloys, titanium and other steel types are sometimes
required.
There is a brief list of possible materials below.
Carbon Steel / 410 Stainless Steel / 304 Stainless Steel / 316L
Stainless Steel / 321 Stainless Steel
Monel / Inconel / Nickel / Titanium / Duplex 2205 / Hastelloy
alloys
Please specify if you need other materials not listed here.
When we decide what type of internals are best suitable for a given
tower, like for distillation, fractionation or other mass transfer
process, we must consider many factors. The desired capacity,
efficiency, turndown, pressure drop, corrosion, fouling and
previous plant experience are all of importance.
Hualai has successfully served the process industries such as oil
refineries, chemical plants, etc. Let us apply this experience to
your project to assure a successful result and continued success of
your plant.
Welcome your contact with your private tower internals plan or
ideas!
