High efficiency multi hooks vane demister technical specification
1. Hualai vane demister project use,
The scope of the project includes the design of process,
electrical, instrument control, water supply and drainage, HVAC and
other systems, equipment selection, procurement, manufacturing and
transportation, design, installation, construction and
commissioning, trial operation, personnel training and final
delivery and commissioning of Civil Engineering (structure) for the
normal operation of closed coke storage system of delayed coking
unit.
2. Advantages of vane demister
1. Lower pressure drop;
2. Resistance to fouling;
3. High tensile strength;
4. Durable and long service life;
5. Custom-made design available;
6. High filtering and separating efficiency;
7. High capacity. It has 30% to 100% more capacity than the wire
mesh mist eliminator.
3. Working theoty of chevron plate mist eliminator
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 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.
4. Vane demister datasheet,
| 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
| |
| | |
5. Hualai experiences of chevron plate mist eliminator:
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.
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