Metal pall ring used in (petrochemical /chemical fertilizer
/environmental protection )Industry
1.Pall ring description
Metal tower packing is made of material like carbon steel,
stainless steel or Aluminum alloy, etc. The product has features
such as thin wall, heat resistant, high free volume, high capacity,
low resistance, high separation efficiency and so on. It is
especially suitable for rectification towers under vacuum to treat
thermo sensitive, decomposable, polymerizable or cokable systems,
so it is widely used in packing towers in petrochemical industry,
chemical fertilizer industry and environmental protection, etc.
Metal Pall ring uses ring mass transfer characteristics, saddle
pressure drop is low, large load, pressure reduction, good
gas-liquid distribution, high mass transfer efficiency. It is
mechanically strong, the probability of breaking is small, suitable
for deep rock strata.
Metal Pall ring has the characteristics of thin wall, heat
resistance, large free volume, large capacity, low resistance and
high separation efficiency.
It is especially suitable for distillation column to deal with
heat-sensitive, decomposable and convergable systems under vacuum.
2.Metal pall ring's specification:
diameter×height×thickness
(mm) | specific surface area
(m2/m3) | Porosity
(m3/m3) | Number in 1 m-3 | Density of the pile
(kg/m3) | Dry filler factor
F |
| 76×76×1.2 | 71 | 0.961 | 1830 | 308 | 80 |
| 50×50×0.8 | 109 | 0.960 | 6500 | 314 | 124 |
| 38×38×0.6 | 146 | 0.959 | 15180 | 318 | 165 |
| 25×25×0.5 | 219 | 0.950 | 51940 | 393 | 255 |
| 16×16×0.3 | 362 | 0.949 | 214000 | 396 | 423 |
3.Application of Metal Pall Rings:
1. Liquid extractors;
2. NH3 extraction devices;
3. Ethylene extraction columns;
4. Carbon monoxide converters;
5. Petrochemical and medical equipment.
6. Dimethyl terephthalate running column;
7. Mass-transfer columns separation devices;
8. Carbon dioxide and hydrogen sulphide absorption and flash tower;
It is applied to various of device of
isolation,absorption,desorption,common decompression such as
Toluene separation,Ethylbenzene separation,Isooctane separation,and
desulfurization systerm and so on.
Hualai pall rings are available in several sizes as indicated on
our design sheets to suit most commercial applications. They range
in size from 10mm to 76mm or equivalent. It is an essentially a
design consideration in specifying a packing size based on capacity
and efficiency requirements. The nominal packing size specified
should however not be greater than 1/10th of the column diameter.
The packing is usually specified in the lowest cost material of
manufacture that will satisfy temperature and corrosion
requirements. Some of the most common materials listed in order of
relative cost are:
Polypropylene (mainly aqueous systems up to 100 deg. C)
Carbon steel (non-corrosive hydrocarbon systems)
Ceramic (sulphuric acid & nitric acid absorbers)
Stainless steels (most hydrocarbon systems)
PVDF, PFA (corrosive aqueous systems up to 150 deg. C)
PVC / C-PVC (corrosive aqueous systems up to 90 deg. C)
4. variety introduced:
Capacity vs Pressure Drop
• High loading & throughput / low pressure drop;
• Good liquid / gas distribution and high mass transfer efficiency.
Versatility
• Easily wettable;
• High resistance to fouling;
• High Temperature.
Mechanical Strength
• High temperature applications;
• Mechanically robust, lesser probability of breakage, suitable for
deeper beds.
• Absorption • Aeration • Degassing • Desorption
• Distillation • Stripping • Heat Recovery • Extraction
Material: Stainless steel, Carbon Steel, Special Alloys, Aluminum,
Titanium, Hastelloy and Bronze
