TEL:+86-0512-65128852 EXT 801
FAX:+86-0512-65128852 EXT 808

  ENGLISH
NEWS DETAIL
What Is The Eliminator?

Publish Time:2021/2/23 13:54:31  Views:

Demistermainly by the waveform blades, plates, card strips and other fixed devices, in wet desulfurization, absorption tower in the process of operation, easy to produce particle size of 10--60 micron "fog", "fog" not only contains water, it is also soluble in sulfuric acid, sulfate, sulfur dioxide, etc., but also caused by the fan, Heat exchangers and flue stains and severe corrosion, therefore, wet desulfurization process on the absorption equipment to remove fog requirements, the purified gas before leaving the absorber to remove fog.Demister Nozzle is one of the main parts of the defogging system, the demister nozzle is mainly made of high quality plastic, with extremely high wear resistance, long service life.


Mist removal device is an important part of Desulfurization Tower. The function of the demister is to capture the fog particles and slurry droplets encased in the flue gas during the spray absorption process. The efficiency of the demister is not only related to the structure of the body but also to the weight and particle size of the fog particles, and the atomization particle size of the nozzle is related to the viscosity of the absorbent fluid, the spray claw force and the nozzle structure. The performance of the demister and the diameter of the fog particles are fitted well in order to achieve a good defogging effect. If the fog is not good, the flue gas entrainment slurry will be brought to the downstream equipment, such as Jiong gas heater, fan (industrial boiler desulfurization commonly used), flue, and then cause blockage, serious vibration of the fan, Jiong strict warbler corrosion, scaling and so on, and thus forced to stop operation.


The demister is mainly composed of plate and supporting device. Plates are usually made from 2 major materials such as polymer materials (such as polypropylene PP, FRP, etc.) or stainless steel (e.g. 316L, 317L, etc.). Generally divided into streamlined and folded line type.


When a gas containing fog flows through the demister at a certain speed, the droplets are separated from the surface of the waveform plate because of the inertial impact of the gas, and when the droplets collide with the waveform plate to produce more gravity than the rising force of the gas and the tension of the liquid surface. The multi-fold structure of the demister waveform plate increases the chance of the fog foam arrest set, and the removed mist foam is arrested at the next turn after the same effect, so that the repeated effect, thus greatly improving the defogging efficiency. After the gas passes through the waveform plate mist removal device, it basically does not contain fog foam. Through the bending channel of the demister, the flue gas separates the droplets encased in the airflow under the action of inertial force and gravity: the flue gas after desulfurization flows through the demister at a certain speed, the flue gas is rapidly and continuously changing the direction of movement, because of centrifugal force and inertia, the droplets in the flue gas collide onto the blades of the demister and are arrested. The droplet collection forms the flow of water, which, due to the action of gravity, falls into the slurry pool, realizes the gas-liquid separation, and causes the flue gas flowing through the demister to discharge after removing the fog requirement.

The defogging efficiency of the demister increases with the increase of the airflow velocity, which is due to the high flow rate, which is used for the inertial force on the droplets, which is beneficial to the separation of gas and liquid. However, increased flow rates will result in increased system resistance and increased energy consumption. And the increase in flow rate has a certain limit, too high flow rate will cause two water, thus reducing the efficiency of defogging. Usually, the flue gas flow rate is defined as the critical flow rate through the highest and not secondary water mist section, which is related to the structure of the demister, the water load of the system, the direction of the airflow, the arrangement of the demister and other factors. The design flow rate is generally selected in 3.5-5.5m/s.


The diameter of the dispersed droplets in the gas encountered in the usual chemical operation is about 0.1~5000μm. The separation problem of particles with general particle size above 100μm is easy to solve because of the fast settlement speed. Droplets with a diameter greater than 50μm can be separated by gravity deposition; 5μm above the droplets can be used for inertial collisions and centrifugal separation; and for smaller fine fog, efforts should be made to gather them to form larger particles, or to use fiber filters and electrostatic demister.