Active Member
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[China]
Contact name:Amy
Anping Yuanqiao Petrochemical Equipment Co., Ltd |
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Rectangle SS316L chevron mist eliminator custom design and
fabrication
1. Chevron mist eliminator application:
Chevron plate demister is mainly used for flue gas desulfurization
and separation of droplets in waste gas. It has the advantages of
simple structure, high capture efficiency for medium size and large
size droplets, low pressure drop, easy flushing, open structure,
easy maintenance and low cost.
Mainly there are two types of plates, 2 pass type (170mm net height
and 200mm total height with frame), 3 pass type (230mm net height
and 250mm total height with framesm). The shape and size of mist
eliminator can both be customized as per order. Square shape, round
shape, etc.
The 3 pass type has higher de-misting efficiency. It is always used
in less solid fouling circumstances because of a little harder
washing than 2 pass type.
2. Chevron mist eliminator design parameters:
| No. | Item | Unit | Data |
| 1 | Absorber (case) | ||
| 1.1 | Diameter of front passage of demister | m | Φ2.6 |
| 1.2 | Raw flue gas flow of single tower (wet) | m3/h | 31000 |
| 1.3 | Net flue gas flow of single tower (wet) | Nm3/h | 32500 |
| 1.4 | Net flue gas temperature | ℃ | 45 |
| 1.5 | Average velocity of flue gas before demister | m/s | ≤2 |
| 1.6 | Spray mode of absorption tower | downward | downward |
| 1.7 | Absorber nozzle type | Hollow cone | |
| 1.8 | Average droplet size(D32) | μm | 2000 |
| 1.9 | Flue gas temperature: normal operation / design | ℃ | 45/80 |
| 1.10 | Cl-concentration | ppm | ＜40000 |
| 2 | Demister data | ||
| 2.1 | First stage vane plate demister | ||
| 2.1.1 | Type | ||
| 2.1.2 | Material | ||
| 2.1.3 | Weight | kg | |
| 2.2 | Second stage vane plate demister | ||
| 2.2.1 | Type | ||
| 2.2.2 | Material | ||
| 2.2.3 | Weight | kg | |
| 2.3 | Liquid holding capacity of flue gas at demister outlet (dry, standard state) | mg/Nm3 | |
| 2.4 | Pressure drop (two stage plate) | Pa | <150 |
| 2.5 | Material of demister | ||
| 2.6 | Spray pipe material | ||
| 2.7 | Total weight of spray pipe | kg | |
| 2.8 | Nozzle material | ||
| 2.9 | Nozzle pressure drop | bar | |
| 2.10 | Number of nozzles | pc | |
| 2.11 | Nozzle unit weight | kg | |
| 3 | Flushing water volume | Fill in by 100% | |
| 3.1 | Upper part of the first stage | m3/(h·m2) | |
| 3.2 | Lower part of the first stage | m3/(h·m2) | |
| 3.3 | Upper part of the second stage | m3/(h·m2) | |
| 3.4 | Lower part of the second stage | m3/(h·m2) |
3. Chevron mist eliminator working principle:
when the gas containing mist flows through the demister at a
certain speed, because of the inertial impact of the gas, the mist
and wave plate collide and are attached to the wave plate surface.
The diffusion of the mist on the surface of the corrugated plate
and the gravity settlement of the mist cause the mist to form large
droplets and move forward with the air flow to the turning of the
corrugated plate. Because of the centrifugal force of the steering
and its friction with the corrugated plate, the adsorption and the
surface tension of the liquid, the droplets become larger and
larger until the concentrated droplets are larger than the gravity
generated by themselves, which exceeds the lifting force of the gas
and the surface tension of the liquid. When the force is applied,
the droplets are separated from the surface of the wave plate. The
multi fold structure of the wave plate of the mist eliminator
increases the chance of catching and gathering the mist, and the
undeleted mist will catch and gather at the next turn through the
same function, so it will work repeatedly, thus greatly improving
the efficiency of mist eliminator. After the gas passes through the
chevron mist eliminator, there is basically no mist.
Operation range and capture efficiency reference chart for different droplet sizes (Quoted from
world-leading manufacturers).
