S CUBE Mist eliminator

Mist elimination, or the removal of entrained liquid droplets from a vapor stream, is one of the most commonly encountered processes regardless of unit operation. Unfortunately, mist eliminators are often considered commodity items and are specified without attention to available technologies and design approaches. The engineered mist eliminator may reduce liquid carryover by a factor of one hundred or more relative to a standard unit, drop head losses by 50% or more, or increase capacity by factors of three or four. This manual summarizes cost effective approaches to reducing solvent losses or emissions, extending equipment life and maintenance cycles using proven and cost effective technologies and techniques. S cube mist eliminators offer a robust remedy for liquid entrainment challenges in various equipment, including:

Scrubbing, absorption, stripping, or distillation towers
Evaporators
Folling film condensers
Sedimentation vessels
Tri-phase separators
Desalination facilities
Cooling systems
Gas moisture removal plants
Compression mechanisms.

Liquid entrainment within a process gas stream can originate from dynamic activities,like the interaction between gas and liquid phases during a mass transfer task, or from thermal actions such as condensation. For instance, droplets might emerge when bubbles burst or jet at a gas/liquid boundary, commonly seen in distillation columns, evaporators, bubble columns, and inundated packed bed scrubbers. High relative speeds between gas and liquid can also shear droplets from moistened surfaces, a scenario often witnessed in venturi scrubbers, dual-phase flow within pipes, and packings.

Advantages & Features

Can handle liquid volumes up to three times that of regular mesh pads.
Demonstrates a 20% higher vapor capacity compared to standard technology.
Compatible with all mesh pad varieties, even those made from combined materials.

Customizable to fit a variety of vessel dimensions and forms.
An economical and adaptable choice for numerous mist elimination needs.
Simple to manage and set up, seamlessly fitting between current double rings (both top and bottom supports).

Common Uses

Upgraded towers with the newest packings and trays requiring mist eliminators due to increased vapor flowrates or entrainment.
Enhancements to existing knock-out drums, eliminating the cost of buying a new vessel.
Scenarios with high pressure where the difference between vapor and liquid density is minimal.

Systems with low surface tension, like NGLs, where secondary droplet atomization is dominant.
Positioned beneath a high-capacity vane; the mesh pad readies and merges fine droplets for capture by the vane, while troughs channel the accumulated liquid to the vessel's edge.
In high turndown cases - up to 50% more than traditional pads - where superior droplet removal is crucial, even during plant initiation or transitional phases.

Primary Attributes

Achieves high-efficiency separation for droplets as small as 2 to 3 µm.
Usually experiences a pressure drop below 2.5 mbar.

Various mist eliminators exist for the task of separating entrapped liquids. When determining the right tool, it's essential to understand the four primary droplet capture methods:

Diffusional Deposition

Deposition is primarily effective for separating ultra-fine aerosols, typically those with droplets under 1µm in size. These droplets are minute enough to be influenced by Brownian Motion.

Direct Interception

operates on the idea that a droplet, with a specific diameter and negligible weight, will follow the gas flow around a 'target' wire or fiber. The droplet is then separated when it comes into contact with the target or collecting fiber.

Inertial Interception

takes into account the weight of the droplet, predicting how its momentum will cause it to diverge from the gas flow.

Gravitational Deposition

is based on the concept that large, slow-moving droplets might naturally separate from a gas flow due to gravity. However, this method is limited to bigger droplet sizes and minimal gas speeds, often resulting in impractically large and cost-inefficient separator dimensions.

The effectiveness of each mechanism heavily relies on the droplet size distribution specific to an application. For instance, in gas drying tasks using glycol contactors, droplet sizes typically range between 5-25 µm, and achieving a high separation efficiency is paramount. Under such conditions, direct and inertial interception prove to be the most suitable methods. The best separation results are obtained when droplets impact the wires of top-tier mesh mist eliminators.

Types of Mist Eliminator

SCM PLAIN VV

Features plate-style vanes designed for separating entrained droplets.

SCM SINGLE HOOKED V

Equipped with an additional vane to enhance mass transfer efficiency.

SCM DOUBLE HOOKED V

Incorporates two supplementary vane plates, adjusted for optimal vane angles, to achieve improved performance outcomes.

Subtypes of the Mesh Type Demister Pad

Different types of Mesh Type Demister pad are classified on the basis of mesh density has been mentioned in the below chart-

Style	Material	Application	Wire Diameter mm	Mesh density Kg/m³	Surface Area m²/m³	Voidage %	Nominal Micron Rating*
SCM-A1	Metals	Very high efficiency in clean service	0.15	195	650	97.5	3µ
SCM-A2	Metals	Fine droplet removal in clean service	0.15	145	480	98.2	4µ
SCM-A3	Metals	General purpose, clean service	0.15	112	375	98.6	5µ
SCM-B1	Metals	Optimum efficiency & pressure drop	0.275	195	355	97.6	5µ
SCM-B2	Metals	General purpose, not totally clean	0.275	170	310	97.9	6µ
SCM-B3	Metals	Heavy duty e.g. oil & gas separators	0.275	145	265	98.2	8µ
SCM-C1	Metals	Light fouling	0.275	110	200	98.6	10µ
SCM-C2	Metals	Moderate fouling	0.275	80	145	99.0	12µ
SCM-C3	Metals	Heavy fouling e.g. evaporators	0.275	50	90	99.4	15µ
SCM-PP1	Polypropylene	Acid mists	0.25	75	1120	93.0	3µ
SCM-PP2	Polypropylene	Chemical Scrubber towers	0.25	50	750	95.3	6µ
SCM-T	Teflon	Very corrosive services	0.25	64	480	97.0	8µ
SCM-PP3	Polypropylene	Low pressure drop e.g. air scrubbers	0.25	33	490	96.9	10µ
SCM-A1X	Metal/PP Mix	Mist removal of polar/Non- polar mixtures	0.25	200	625	95.6	5µ

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