Luteng Environmental Protection New TypeWet electrostatic defoggerIt is based onA type of material made by molding, winding, and hand pasting with corrosion-resistant vinyl resin as the matrix, carbon fiber, and glass fiber as reinforcing materialsPurification and defogging equipment.

The equipment body mainly consists of upper shell, middle shell, anode tube bundle group, cathode corona wire system, rectifier plate, guide (air) plate, spray flushing system, insulator room and other components.

Wet staticElectric defogger(WESP) Wet Electrostatic Mist Eliminator (WESP) Arrangement of WESP System Principle The wet flue gas from the wet desulfurization tower enters the wet electrostatic mist eliminator (WESP), and tens of thousands of volts of direct current high voltage is applied between the anode cylinder and the cathode wire of the WESP. Under the action of a strong electric field, a corona layer is generated around the corona wire, and the air in the corona layer undergoes avalanche ionization, producing a large number of negative ions and a small number of cations. The fine dust (mist) particles in the wet flue gas inside the anode cylinder collide with the positive and negative ions generated by discharge and become charged. The charged dust (mist) particles move towards the cathode and anode respectively due to the Coulomb force of the high voltage electrostatic field; After reaching the two poles, the charges carried by each are released, and the dust (mist) particles are collected by the anode and cathode, and separated from the gas by gravity flowing downwards; Part of the dust (mist) particles themselves adhere to the anode plate (cylinder) and cathode wire due to their inherent viscosity, and are washed away.

Structure of WESP device for wet electrostatic defogger（

1) The wet electrostatic precipitator body WESP adopts a circular structure with a specification of Φ 9.2m × 10.7m. The upper part is equipped with a flue gas guide plate and a gas distribution plate, and the lower part is equipped with a liquid collection tank. The total height is about 14m (including the cover top and the lower collection tank). The outer shell is made of carbon steel lined with glass flakes. The outlet flue of WESP is located on the side of the main body, directly connected to the existing vertical clean flue, reducing the resistance of the flue gas; And it can also prevent the purified flue gas from carrying water again. The collected liquid flows automatically into the slurry tank and is pumped back to the absorption tower by a water pump.

(2) The anode device of the wet electrostatic precipitator includes a sedimentation electrode, a support beam, a flushing water pipe, and a support beam. The anode cylinder (also known as the precipitation electrode) is made of advanced conductive fiberglass material, with good conductivity and easy flushing. The upper and lower ends of the anode membrane are supported and tensioned by support tubes, with the upper support tube also serving as a flushing water pipe. Through this flushing water pipe, online flushing of the six surfaces of the anode membrane can be achieved to ensure that the anode membrane does not scale. The four layers of supporting tubes above and below the anode membrane are supported by four supporting beams. The upper support beam of the anode membrane is fixed to the tower wall, and the lower support beam is adjusted in height by adjusting mechanisms at both ends to achieve tension on the anode membrane. The sedimentation electrode adopts a fiberglass honeycomb structure. The honeycomb structure has a higher utilization rate of cross-sectional area than the circular tube structure, and the fiberglass material has the advantages of good conductivity and long service life. Conductive fiberglass anode tube

(3) The cathode device of the wet electrostatic precipitator includes a cathode wire, upper and lower suspension devices, and an insulation box. There is a cathode wire arranged at the center of each anode hole, which is made of burr type and lead antimony alloy material. The cathode wire is fixed on the upper and lower frames, and the frame is supported by an insulation box. The suspension rod inside the insulation box is supported by quartz tubes, and the cathode device is kept in a dry and insulated state with the anode and tower body at all times by introducing hot air into the insulation box. The defogger is equipped with one electric field, which is powered by a high-frequency, high-voltage, DC constant current power supply through an insulated box. There are a total of 8 insulation boxes installed above and below the defogger.

A layer of flushing water device is arranged above the wet electrostatic defogger to periodically flush the cathode wire (the flushing cycle of the cathode wire is 15-20 days). Wet electrostatic defogger - titanium alloy cathode wire - heavy hammer electric defogger cathode wire - corona wire - filigree wire. The role of wet electrostatic defogger is to solve the problems of wet desulfurization. Flue gas desulfurization is an effective method widely used at home and abroad to control SO2 emissions in coal-fired flue gas of thermal power plants. Among them, the wet flue gas desulfurization process is widely used in the world due to its mature technology, high desulfurization rate and other advantagesEffective flue gas desulfurization process. At present, the market share of wet flue gas desulfurization worldwide is over 85%, while in China it is as high as 95%. Wet flue gas desulfurization processes generally include limestone/lime gypsum method, ammonia method, seawater method, double alkali method, etc. The removal rate of SO2 in wet desulfurization process can reach over 95%.

Traditional wet flue gas desulfurization systems generally use a two-stage mechanical defogger to remove water droplets carried out by the flue gas, and then heat the saturated wet flue gas washed by the absorption tower through GGH, and then discharge it through the chimney. The starting point of this method is to use GGH heating, and it is expected that the flue gas temperature will increase to about 80 ℃, which can reduce the corrosion of the chimney by the flue gas. But in reality, it has not solved the problem of chimney corrosion, because the removal rate of SO3 in the flue gas during wet flue gas desulfurization is only 40% to 50%, and a considerable amount of SO3 is discharged in the form of aerosols with the flue gas. When a flue gas denitrification device is installed in the current department, the concentration of SO3 in the flue gas will further increase due to the action of the catalyst. At this time, the temperature of the heated flue gas is still lower than the acid dew point temperature, and SO3 condenses on the chimney wall, causing corrosion. The function of a mechanical defogger is to minimize the content of water mist in the clean flue gas, but it only has a good removal effect on large droplets over 40 microns. Fine droplets condense on the chimney wall, causing more severe corrosion.

Micro sized fine dust and aerosols in smoke cannot be removed and can directly enter the human respiratory tract in the atmosphere, posing a threat to human healthHarmful.Wet electrostatic precipitatorIt can solve the problems of gypsum rain and blue smoke caused by wet desulfurization, alleviate downstream flue and chimney corrosion, and save anti-corrosion costs. It has stable and reliable performance, high efficiency, and can effectively collect fine particulate matter (PM2.5 dust, SO3 acid mist, aerosols), heavy metals (Hg, As, Se, Pb, Cr), organic pollutants (polycyclic aromatic hydrocarbons, dioxins), etc. The smoke emission can reach 10mg/m3 or even below 5mg/m3, achieving ultra-low emissions,Solve the chimney emission problem and achieve a 'once and for all' effect.