Demisters

Mist Eliminator-Entrainment Separator

For efficient entrained liquid or mist removal in any liquid-gas/vapour processing operation.

What Is Classifier

The classifier is a tailor made product of Continental Profiles (India) Limited, specially designed and manufactured out of knitted wires. it consists of wires elements sandwiched between a bottom support and top hold down grid. Properly applied it achieves 99.9% and over separation of entrained liquid in a vapour stream. It is individually engineered for specific process conditions and can be made of any shape or size. It can be installed in new as well as existing vessels.

 

Operative Principles Of Classifiers

The separation action of a classifier is mainly that of impingement. The vapour passes easily through large free volume of knitted mesh elements but entrained liquid droplets with greater inertia contact the extensive wire surface of elements and are briefly held. These droplets flow downwards collecting on adjacent wires, flowing downwards again when these collecting points are overloaded. The drops grow in size until they are large enough for the force of gravity to exceed the combined forces of velocity and surface tension when they fall down. The resultant stream is pure vapour containing no liquid.

 

Application

The highly efficient method of entrainment separation by employing classifiers is widely used in liquid gas process operations in petroleum refining, chemical distillation and evaporation, distillation plants and nuclear power plants. The important vessels where classifiers are fitted are distillation columns, vacuum towers, fractionating towers, lube oil towers, flash drums, knock-out drums, steam drums, scrubbers, strippers, absorbers, evaporators, cooling towers.

 

Superb Advantages Of Classifier

• It is a highly efficient entrainment separator at velocities which can vary 8-10 times.
• It has no moving parts and does not require operating attention.
• It is automatic in its operation. No auxiliaries are needed - no instrumentation; once instilled it work.
• It is inexpensive to purchase and easy to install./li>
• It combines very high efficiency with very low pressure drop.
• Is has no operating costs other than periodic replacement after an extended period of operation.
• It can be made from a wide variety of materials to suit any unusual process or corrosive condition.
• It reduces solvent and product losses.
• It is self cleaning because of the scrubbing action of the coalesced droplets.
• It can be designed for operation at high efficiency even during violent surging conditions.
• It pays for itself in a very short time because of its high efficiency and low cost

 

Styles

Classifier Style	Free volume % age	Surface area m2ldm3	Typical service conditions
HC 16	9930	0.15	Minimum pressure drop, dirty service
HC 28	98.2	0.28	Standard-General purpose
HC 38	97.6	0.37	Heavy duty for heavy entrainment loading
HC 41	98.4	0.46	High efficiency for fine entrainment
HC 61	96.0	1.48	Distillation media

 

Materials Of Construction

The classifiers are made of finest quality materials. Wires are smooth, clean and bright for rapid liquid drainage and are stress relieved to resist stress corrosion. They are made in wide range of materials. The important are given below:

 

Materials	Where Used
AISI 304stainless steel	Water solns, Nitric Acid, Reduced Crude, Petroleum fractions etc.
AISI 316, 317 stainless steel	Fatty Acids, Reduced Crude containing Naphthenic Acids and other Corrosives
AISI 430 stainless steel	Water, Nitric Acid, Steam.
Nickel	Caustic Soda, Food Products
Monel	Caustic Soda and other Alkalies, dilute acids.
Copper	Freons, Alcohol
Carbon Steel	Dry, non-corrosive Hydrocarbons.
Polypropylene, polyethelene	Corrosive fluids at moderate temperatures.
Teflon	Highly corrosive conditions

 

Classifier Selections

For proper selection and design of classifiers the detailed information regarding process conditions should be supplied to Continental Profiles. Please indicate the following wherever possible:

(a) Vapour Velocity.	(f) Liquid Particle size and quantity or process and Ststem Description.
(b)Vapour Density.	(g) Operating Temperature and pressure.
(c) Liquid Destiny.	(h) Materials of constructions.
(d) Surface Tension.	(i) Performance requirements.

 

Mechanical Design Details

Classifier elements are securely tied to individual grid sections. The element and grids are made of proper curvature to suit the vessel. The knitted wire mesh is resilient and will provide a sung fit in the vessel. Only requirement for the user is to provide a support ring welded to vessel wall with holes to fasten grid section with tie wires.