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Wet electrostatic precipitator

    In view of the ultra-low emission limit requirements of coal-fired pollutants, Nanhuan technology has developed the wet electrostatic flue gas multi pollutant deep purification technology, overcome the technical bottleneck of the engineering of wet electrostatic precipitator in different levels of units, realized the efficient removal of fine particles, gypsum droplets, aerosols and other multi pollutants, and ensured the near zero emission of fine particles (PM2.5) in flue gas, which has been successfully applied to large-scale coal-fired power plants.


working principle

    The wet electrostatic precipitator adopts the principle of electrostatic adsorption and dust collection, and a high-voltage electric field is added between the anode and cathode. When the dusty flue gas flows through the electric field, the water molecules and dust particles are charged. The dust and fog particles move to the anode under the Coulomb force of the electric field. After reaching the anode plate, a uniform water film is formed on the surface of the dust collector. Under the action of the water film, they can flow downward by gravity and separate from the gas. Compared with the traditional electrostatic precipitator, the dust cleaning of the anode and cathode of the wet electrostatic precipitator does not use mechanical vibration, but uses electrostatic adsorption water mist to clean the anode and cathode, or regular flushing through the spray system.


technical parameter

    The body of wet electrostatic precipitator adopts steel structure, which is mainly composed of cathode, anode, insulation box, flushing system and power supply.

system function



  • It can effectively remove dust, gypsum slurry drops and acid mist;
  • It can synergistically treat mercury and other heavy metals in flue gas;
  • Dust with high contrast resistance can also be captured efficiently;
  • The removal efficiency of particulate matter is more than 85%;
  • The particulate matter in the treated flue gas is less than 5mg / Nm3, which can reach the near zero emission standard.





Technical features

Technical advantages

     The wet electrostatic precipitator developed by Nanhuan technology has reached the international advanced level after being identified by China Society of electrical engineering. Among them, the research and application of new electrode materials are at the international leading level. A number of patented technology contents are incorporated into the relevant wet removal standards of the power industry. It has high performance, high reliability and high applicability, and is suitable for the deep purification of flue gas at the tail end of coal-fired power plants.


Efficient fine particle purification technology ensures the performance requirements of full time and full load

     The wet electrostatic precipitator is not affected by dust characteristics, ash composition, specific resistance and other factors, which is important for collecting fine particles PM2 5. Acid mist has good effect, especially suitable for the capture of fine, humid, viscous or high specific resistance dust. The dust removal efficiency is ≥ 90% and the emission concentration can be less than 5mg / m3, which can realize the standard emission of dust under full load in the whole period.


Collaborative treatment of multiple pollutants such as smoke, acid mist, aerosol and heavy metals

     The SO3 / droplet / aerosol removal efficiency of the wet electrostatic precipitator is 70% ~ 90%, which can solve the pollution problems caused by the emission of SO3 acid mist, slurry droplet aerosol, heavy metals and other particles, and avoid "gypsum rain", "chimney rain", etc.


No secondary dust pollution

     The washing form of wet electrostatic precipitator is water film washing, without rapping or any rotating mechanism, so it will not produce secondary dust, and the device has higher stability and reliability.


GGH can be cancelled to enhance the reliability of system operation

     Wet electrostatic precipitator has excellent removal effect on acid droplets and can alleviate the corrosion of downstream flue and chimney. Therefore, GGH can be cancelled, the anti-corrosion grade of chimney can be reduced, the system operation reliability can be enhanced and the anti-corrosion cost can be saved.


Diversified pole matching types and layout

     The integrated layout of wet electrostatic precipitator and absorption tower and the layout outside the tower are realized, and a variety of cathode line types are finalized to meet the application requirements of different reconstruction projects.


It has advanced FRP anode production line to meet the requirements of harsh construction period

     The company has advanced automatic forming production line of anode tube, and has the production capacity of wet dedusting anode module for more than 100 300MW units per year.

Automatic forming production line of anode tube


Conductive FRP anode technology with independent intellectual property rights

     The anode of wet electrostatic precipitator adopts conductive FRP design, which has high corrosion resistance and good conductivity, and can meet the ultra-low emission requirements under any working condition.

engineering application

The wet electrostatic precipitator developed by Nanhuan technology has been applied to the 300MW Coal-fired Unit of Hunan Yiyang Power Plant for the first time in China, and the first demonstration project in China has been built. According to the detection of professional institutions, more than 80% of gypsum droplets, SO3 and other pollutants are removed, and the fine particles are reduced from 20mg / m3-30mg / m3 to less than 5mg / m3.

 At present, Nanhuan technology has put into operation more than 50 sets of wet electrostatic precipitators, including 3 1000MW units, more than 20 600MW units and more than 20 300MW units. All wet electrostatic precipitator projects of the company have reached ultra-low emission, including nearly 30 sets with zero emission, and have accumulated rich engineering EPC experience, which can provide engineering design, complete sets of key equipment and EPC general contracting services.

 

Performance table of Nanhuan technology wet electrostatic precipitator

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