DEMISTER
Introduction
Mist in Gas has bad impact in various aspects, including environmental pollution, corrosion, and loss of raw materials. mist that are mechanically generated from scrubber, cooling tower and vaporizing pipes, generally has relatively large mist with tens to hundreds of microns in diameter. Micro mist is generated by condensations or chemical reaction of gas.
We have been producing and supplying Mesh type of Demister ( DSM-Type ) and have completed localizing Baffled Mist Eliminator ( DSB-Type ) in our production line.
 Overview
- Demister is called as Mist Eliminator, Wire Mesh Separator and Wire mesh blanket.
- It is a type of Filter that separates and removes mist or dust from fluid and a chemical reaction accelerator.
- Demister can be semi-permanent. It had made of various materials according to condition of usage and its structure is very simple for convenient installation and repair.
Operation Principle of Demister
For example, gas from liquid (L) converts to vapors (V) in distillers. When vapors rise, the surface of liquid breaks to generate micro particles of liquid and deliver them with gas through demister. In this process, micro particles increas in volume due to inertial collision principle on the surface of pad. Particles that contain impurities free fall due to the weight of impurities. Gas come through demister or contain liquid particles release as pure gas to the top of demister.
DEMISTER TOWER PACKINGS
Product Feature
- High collection efficiency of up to 99% of fluid at velocity of 1 to 8m/sec
- Provides free area of up to 98% for operation and low pressure drop (0.1" ~ 1.0" W/G)
- A variety of materials in accordance with temperature and corrosion resistance
- Easy to install by using manhole. Usable without any restriction and replaceable with existing facilities
- Designed for self - cleaning (semi - permanent and economical)
Product Specification/Models Construction
Consists of a mat with overlapping knitted metal or plastic wire meshes, which are assembled in accordance with density for each style and disposed altemately. The assembled mat provides complex and refined structure for inertial impaction, so it provides free area of 98% for operation and low pressure drop.
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Style
|
Applications
|
|
DSM-80
|
Provides low pressure drop at high velocity and general collection efficiency. Used for collecting lager particles. |
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DSM-144
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Mainly used in the field of petrochemical plants. Provides relatively low pressure drop and collection efficiency
of up to 90~99% |
|
DSM-193
|
Most commonly used. Provides collection efficiency of up to 98~99% on 5~10 microns at velocity of 1~5m/sec. |
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DSM-390
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Provides high pressure drop at low velocity of 1m/sec and collecion efficiency of up to 90% or greater. |
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DSM-220
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Used for collecting minute particles sized for 1 micron, Thicker is better in case of minute particles with low density (approximately 10g/m3) |
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DSM-432
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Used for collecting sub-micron particles 0.05~1 micronc More effective than DS-220 Style |
SUS MESH DEMISTER/P,P MESH DEMISTER
Material
Offers DEMISTER in a variety of stainless steel and plastic material such as
1. Stainless steel ( SUS316L, SUS316, SUS304) 2. P.P (POLY PROPYLENE), P.E (POLY ETHYLENE) 3. GLASS FIBER
Selection of Demister
The below table as standard style has selected through referred articles, practical consumers and the company research for most suitable type according to the broad ranges of usage for DEMISTERSMS recently. It helps to identify basic type for use and refer to change of specifications as standards.
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DENSITY(m2/kg)
|
FREE AREA(%)
|
SURFACE AREA(m2/m3)
|
EQ.STYLE
|
|
SUS
|
P.P
|
SUS
|
P.P
|
SUS
|
P.P
|
YORK
|
NIHON
MESH
|
GOTO
SHOJI
|
|
DSM-80
|
80
|
30
|
98.9
|
96.7
|
155
|
495
|
931
|
H
|
H155
|
|
DSM-120
|
120
|
-
|
98.5
|
-
|
210
|
-
|
631
|
L
|
|
|
DSM-128
|
128
|
-
|
98.4
|
-
|
460
|
-
|
326
|
SN
|
|
|
DSM-144
|
144
|
38
|
98.2
|
95.8
|
275
|
630
|
431
|
N
|
S275
|
|
DSM-193
|
193
|
42
|
97.6
|
95.4
|
378
|
690
|
421
|
SL
|
S370
|
|
DSM-300
|
300
|
-
|
96.2
|
-
|
575
|
-
|
-
|
SM
|
|
|
DSM-390
|
390
|
-
|
95
|
-
|
740
|
-
|
-
|
SH
|
S740
|
|
DSM-220
|
220
|
-
|
97.2
|
-
|
905
|
-
|
-
|
T
|
M905
|
|
DSM-432
|
432
|
-
|
94.5
|
-
|
1,780
|
-
|
800
|
R
|
M1740
|
|
DSM-GRASS
|
160
|
80
|
96.7
|
94.7
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5.000
|
-
|
|
G.S/G.P
|
|
Installment and Grid
DEMISTER in tower must be fixed and supported at level and Support Grid is commonly used for fixing bottom side or the upper and lower sides, which was made by welding FB 25x3t. RB6 (the same material with DEMISTER PAD) at regular intervals (APP 150mm). In addition wire of diameter 1 or 1.6 is used for fixing GRID and PAD and how to fix them as follows.
SUS MESH DEMISTER / P.P MESH DEMISTER
DEMISTER collect essentially 100% of all liquid particles 2 to 5 microns in diameter, depending on design parameters. Available in virtually any size of shape, in a broad range of metals or plastics, individual styles of DEMISTER can be supplied to meet specific customer needs. DEMISTER has high collection efficiency, lowest installed cost, low pressure drop.
Pressure Drop
When using demister, pressure drop is thought to be about 0.1"~1.0"W/G.
Theoretically, it is calculated by the following formula.
|
Style
|
α
|
|
DSM-80
|
H 155 STYLE
|
0.65
|
|
DSM-144
|
S 275 STYLE
|
1.1
|
|
DSM-193
|
S 370 STYLE
|
1.5
|
|
DSM-390
|
S 740 STYLE
|
3.0
|
|
DSM-220
|
M 905 STYLE
|
3.6
|
|
DSM-432
|
M 1,740 STYLE
|
7.0
|
BAFFLED MIST ELMINNATOR
Product Characteristics
- No clogging occurs when separating and eliminating large amounts of dust in liquid or mist with viscosity. Suitable for separating relatively rough water drops.
- Eliminator structure can be reduced resistance loss and to be low pressure drop in high gas flow.
Horizontal Type:5-7 M/S
Vertical Type:4-6 M/S
- It's stable for large capacity gas processing and High efficiency for space and affordable cost.
- Appropriate heat - resistant and corrosion - resistant materials can be selected by gas conditions. Mostly made with SUS (stainless steel), P.P(polypropylene), FRP.
- Good turn down characteristics.
Use and Applications
- Elimination of impurities in gas (To prevent Air pollution)
- Elimination of impurities in gas (To improve product purity)
- Prevents scattering of raw materials (saves cost)
- Mist collection and separation during plant processing before or after and it makes to extend Eliminator life and to save energy
BAFFLED MIST ELMINNATOR
Baffled Mist Eliminator is baffle or zigzag blade modules tailored for either vertical or horizontal flow installations. These Mist Eliminaters collect essenrially 100% of all particles greater than 8 to 40 micron in diameter depending on design parameters.
Baffled Mist Eliminators can be manufactured in
Stainless steel (SUS316L, SUS316) P.P (Poly propylene) FRP
Air Filter
|
1. Structure
It's assembled Demister with wire mesh both side or expanded metal
part into a Air filter
2. Characteristics
Low resistance and High efficiency of dust collecion
Made with various materials to be suitable for any condition
Light weight for easy installation and repair
Semi-permanent and economic.
3. Use
Cooling/Heading Devices Ventilation/Air Conditioning
4. Specification
Mostly 500 X 500 X 50T, but may be customized for special needs.
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|
TOWER PACKINGS INTERNALS
Material Properties of Tower Packings
|
Tower packings
|
Material
|
Dimension (in)
|
Thickness
|
Filling Value per 1m3
(1/m3)
|
weight per 1m3
(kg/m3)
|
Surface Area per 1m3
(m2/m3)
|
Porosity (kg/m3)
|
|
Palling
|
Stain less
Steel
|
5/8
|
0.4mm
|
234,000
|
465
|
361
|
0.902
|
|
1
|
0.8mm
|
50,900
|
513
|
207
|
0.938
|
|
1 1/2
|
1.6mm
|
13,300
|
376
|
129
|
0.953
|
|
2
|
-
|
6,630
|
353
|
102
|
0.964
|
|
P.P
(Poly
propylene)
|
5/8
|
-
|
234,000
|
72.1
|
361
|
0.88
|
|
1
|
-
|
50,900
|
72.1
|
207
|
0.90
|
|
1 1/2
|
-
|
13,300
|
67.3
|
128
|
0.95
|
|
2
|
|
6,500
|
67.3
|
102
|
0.91
|
|
Hi-Lex
|
P.P
(Poly
propylene)
|
1 (25)
|
|
38,000
|
88
|
260
|
90
|
|
2 (50)
|
|
8,000
|
64
|
100
|
93
|
|
3 (75)
|
|
1,850
|
48
|
75
|
95
|
|
Tellerette
|
P.P
(Poly
propylene)
|
SO (47)
|
|
32,500
|
110
|
185
|
82
|
|
S (51)
|
|
25,000
|
103
|
180
|
89
|
|
Sii (59)
|
|
17,500
|
529
|
118
|
0.79
|
|
M (73)
|
|
8,000
|
102
|
127
|
85
|
|
L (85)
|
|
3,800
|
90
|
102
|
89
|
Style
SOME EXAMPLES OF THE INSTALLATIONS
DEMISTER collect essentially 100% of all liquid particles 2 to 5 microns in diameter, depending on design parameters. Available in virtually any size of shape, in a broad range of metals or plastics, individual styles of DEMISTER can be supplied to meet specific customer needs. DEMISTER has high collection efficiency, lowest installed cost, low pressure drop.
Applications by Industries
|
PETROLEUM FILTERING
|
PETROCHEMICAL PLANTS |
NATURAL GAS/CITY GAS PLANTS |
| CHEMICAL FERTILIZER PLANTS |
LACTIC ACID PLANTS |
SALT FACTORIES |
| SUGAR FACTORIES |
PULP FACTORIES |
ALCOHOL FACTORIES |
| FOOD FACTORIES |
STEEL PLANTS |
|
| OXYGEN PLANTS |
CHEMICAL PLANTS |
|
| ABSORBERS |
AIR WASHERS |
AIR CONDITIONS |
AIR FILTERS |
| CATCH-ALLS |
CRYSTALLIZERS |
COOLING TOWERS |
FRACTIONAING COLUMNS |
| DEODORIZERS |
DISSOLVER TANK |
DUCTS |
SCRUBBERS |
| EVAPORATORS |
FLASH TOWERS |
GAS ABSORBERS |
STEAM SEPARATORS |
| GAS CLEANERS |
KETTLES |
KNOCKOUT DRUMS |
|
| VACUUM TOWERS |
SEPARATORS |
STACKS |
|
Usage of Demister
- VACUUM TOWER - Treatment volume has increased 35% by demister, and quality of oil shall be increased.
- ABSORBER - A gasoline plant has saved costs within 1 month by glycol absorber (DEMISTER installation).
- KNOCKOUT DRUMS AND SEPARATORS - It is enough to use with small size of drum by DEMISTER
- GAS SEPARATOR VESSELS - Purified gas of 1/100,000,000 by collection of hydrocarbon from gas.
- EVAPORATOR - lower product loss and distinctive higher purity.
- SCRUBBER - Caustic soda factory use demister to protect air pollution as an example.
- DISTILLATION COLUMN - Distillation ratio shall be increased by DEMISTER , and it has 20% of increased treatment volume and maximized purity.
- DUST COLLECTORS - It has advanced capacity to collect dust as Wet Type of Dust Colletor.
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