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Wet electrostatic mist eliminator

Wet electrostatic mist eliminator

Country/Region china
Company ShanDong HuaTong Co.,LTD
Categories Mist Eliminator Demister
Update 2017-07-05 15:06:09
ICP License Issued by the Chinese Ministry
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Wet electrostatic mist eliminator
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The mist eliminator is mainly composed of wave blade, plate, clip strip fixing device in wet desulphurization absorption tower in the process of operation, easy to produce 10--60 micron particle diameter "fog", "fog" not only contains water, it is dissolved with sulfuric acid, sulfate, sulfur dioxide and other two at the same time, also caused contamination blower, heat exchanger and flue and severe corrosion, therefore, wet desulfurization process of absorption equipment proposed demisting requirements, mist gas be purified before leaving the absorption tower.

The mist eliminator is used to separate the liquid droplets from the gas in the tower, so as to ensure the mass transfer efficiency, reduce the loss of valuable material and improve the operation of the compressor. Can effectively remove 3--5um droplets, if set between trays of demister, not only can guarantee the efficiency of mass transfer tray, can also reduce the plate spacing.

So the mist eliminator is mainly used for gas-liquid separation. Air filter can also be used for gas separation. In addition, the screen can also be used as the instrument industry in various types of instruments in the buffer, to prevent the interference of electronic shielding, etc..

Wet desulfurization, it is also dissolved in sulfuric acid, sulfate, sulfur dioxide, etc.. If not properly resolved, any into the chimney fog",

Three dimensional simulation of desulfurization system

In fact, the sulfur dioxide emissions into the atmosphere, but also caused by fans, heat exchangers and flue gas pollution and serious corrosion. Therefore, the wet desulfurization process on the absorption equipment put forward the requirements of fog, purified gas before leaving the absorption tower to remove fog. Demister is the key equipment in FGD system, and its performance directly affects the continuous and reliable operation of wet FGD system. The trouble of demister will not only cause the outage of the desulfurization system, but also may cause the whole unit (system shutdown).

The arrangement of the mist eliminator is the most common type of flat plate arrangement and roof arrangement.

When the gas containing entrainment at a certain speed through the demister, because the gas inertia impact force, entrainment and wave plate collision and the droplets are together to its own gravity over the gas lift and liquid surface tension, droplet from corrugated plate surface break down. Multi fold demister with corrugated plate structure to increase the mist captured the opportunity, not removed the mist at the next corner after the same role was arrested, so repeatedly, thus greatly improving the demisting efficiency.

After the gas passes through the corrugated plate demister, the gas is basically free of fog. The flue gas passes through the mist in the curved channel, the inertia force and gravity the droplets entrained in the stream separated: after flue gas desulfurization at a certain speed through the demister, flue gas is rapid and continuous change of the direction of movement, because of the centrifugal force and the inertia effect of the flue gas inside the droplet impact to removal mist leaves trapped down, forming a water droplet collection, by gravity, fall into the slurry tank, the gas-liquid separation, which flows through the flue gas removing mist to mist after discharge.

With the increase of the air velocity, the mist removal efficiency of the demister increases, which is due to the high flow velocity and the inertia force acting on the droplet. However, the increase of flow velocity will increase the system resistance and increase the energy consumption. And the increase of flow rate has a certain limit, the flow rate is too high will cause two times with water, thus reducing the efficiency of fog.

Usually through the demister section of the highest and without definition of the two velocity of flue gas with water when the critical velocity, the velocity and the mist eliminator system structure, water load, flow direction, in addition to the factors related to the mode of arrangement of mist. Design velocity is generally selected at 3.

5 - 5.5m/s.

The diameter of the dispersed droplets in the usual chemical operation is about 0.1 ~ 5000 m. Generally, the particle size of 100 m or more can be solved easily because of the rapid sedimentation rate. The droplet diameter is larger than 50 m, the available gravity sedimentation separation; more than 5 mu m droplet collision and available inertial centrifugal separation method; for smaller mist to try to make it together to form larger particles, or by fiber filter and electrostatic precipitator.

(mist eliminator10--60





Product Tags:

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