Anping Yuanqiao Petrochemical Equipment Co., Ltd
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).