Hualai custom made 316L chevron plate demister with edge cover
1. Chevron plate demister structure,
The chevron plate demister consists of a set of chevron corrugated
plates with well defined geometry. It is very popular and useful
internals for gas liquid separation applications. These plates
according to design and shape can remove the droplets more than 8
microns.
Hualai factory has been producing a range of vane pack mist
eliminators for critical applications in industrial use. Standard
Material of vane type mist eliminator is polypropylene & stainless
steel.
2. How does the chevron plate demister works,
when the gas containing mist flows through the vane pack mist eliminator 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 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.
3. Chevron plate demister datasheet (case)
| Table 3 data sheet of demister |
| 1. | Project No.: | | |
| 2. | Equipment name | | Vane demister |
| 3. | Quantity | In use | quantity | 1 |
| Spare parts | quantity | 0 |
| Total | quantity | 1 |
| 4. | Purpose | | Removal of slurry droplets in FGD emission And control the dust emission concentration at the outlet of
absorption tower |
| 5. | Basic design conditions | | |
| 1) Characteristics of flue gas | | |
| (1) Name of flue gas | | Flue gas after dust removal and desulfurization |
| (2) Flue gas flow at absorber inlet | m3/h | 31000 |
| (3) Dust concentration at absorber inlet | mg/Nm3 | ≤20(Standard state dry basis,3%O2) |
| Flue gas flow at absorber outlet | m3/h | 32500 |
| Flue gas velocity | m/s | ≤2.0 |
| (4) Outlet temperature of absorption tower | ℃ | 45 |
| (5) pressure | kPa･G | 1.0 |
| (6) Expected flue gas composition | | See Table 1 |
| (7) 预期浆滴成分 | | |
| H2O | (liquid) | wt% | ~95 |
| Na2S | (solid) | wt% | 4 |
| Na2HS | (solid) | wt% | 1 |
| Droplet characteristics | | |
| Density | kg/m3 | ~1020 |
| PH | － | 7~10 |
| Viscosity | cPa | <3 |
| 2) Type of demister | | As per order |
| 3) Installation position | | Upper part of absorber |
| 6. | Structural design conditions | | |
| 1) Standards, specifications | | As per order |
| 2) Design pressure of absorber | kPa·G | -1.0~+5.0 |
| 9) Design temperature(maximum temperature and time of mist
eliminator) | | Depends on material |
| Shell | ℃/min | |
| demister | ℃/min | |
| 3) Corrosion allowance | |
| 4) Shell size of demister | Inner diameter of absorption section of absorption tower Φ 2.6m |
| 5) texture of material | |
| | |
| | 304, 316L, 2205, 2507, TA2, etc. |
| | |
| - Internal flushing pipe fittings
| |
| | |
4. Advantages of Hualai vane pack mist eliminator / chevron plate
demister:
Experience: Mist droplets are thrown out of the gas by multiple gentle angles,
minimizing disruptive eddies at the corners. Metal plates are held
by equal-space slotted frames. We care about the details for each
application.
High quality: When you walk on the finished vane pack mist eliminator, you can
feel its strength and stiffness. Thicker plates resist fluttering
and last longer in corrosive and erosive service. It requires
little maintenance after installation in the vessels.
Lower Pressure Drop: Gentle angles of the plate means lower pressure drop than those
with sharp corners and drainage hooks. It makes great difference
especially in some applications such as vacuum towers.
Higher Efficiency: Less turbulence around the corners also means minimal
re-entrainment of liquid draining down the plates.
Usually for droplets with diameter 20 microns and larger, the
removal efficiency is over 90%; and for 40-micron and larger
droplets, the removal efficiency can be 99.9%.
More Throughput: It allows higher gas velocity than mesh pad demister without
losing efficiency due to re-entrainment.
Materials to Suit Your Process: The most common construction materials are carbon steel and 304
and 316 stainless steel. But we understand your corrosion
requirements and can provide other alloys or nonmetallic
construction as per order.
Hooked Plates for Special Applications:
For PP material, vane plates with small hook is available for
option. And for stainless steel material, vanes can be welded with
short extensions hooks from one or more corners. That style is
preferred by some users to help prevent re-entrainment of liquid.
5. Some ideas of new chevron plate demister,
Removal of very small droplets can be achieved using a two stage
mist eliminator by fitting a mesh pad to the upstream face of the
unit to coalesce droplets as small as 4 to 5 microns into droplets
in the size range which are easily removed by the vane separator.
Welcome your inquiry anytime! We are ready to provide any possible
help we can!
