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Wang X.,National Engineering Laboratory for Coal Fired Pollutants Emission Reduction | Chang J.,National Engineering Laboratory for Coal Fired Pollutants Emission Reduction | Chang J.,Shandong Shenhua Shanda Energy & Environment Co. | Xu C.,National Engineering Laboratory for Coal Fired Pollutants Emission Reduction | And 3 more authors.
Journal of Electrostatics | Year: 2016

Electrostatic precipitator (ESP) with a wet membrane collecting electrodes plays an important role in the flue gas cleaning process. In this work, a lab scale ESP model, with a wet membrane collecting electrode, was constructed and investigated. The collection and charging characteristics of particles in the ESP model were studied. In addition, the discharge characteristics and electric power consumption of ESP were also presented. The mechanisms causing higher collection efficiency of this wet membrane-based ESP in the aspect of electrical characteristics were discussed in detail. Compared with the ESP with dry metal collecting electrode, results show that the discharge current of the ESP with wet membranes collecting electrode was higher for the same conditions. The wet membranes electrode had a better effect on the charging process of particles, especially for particles smaller than 1 μm in diameter. The collection efficiency of this ESP is by 3%–5% higher than the dry metal one at an equivalent discharge corona power consumption. © 2016


Wang X.,National Engineering Laboratory for Coal Fired Pollutants Emission Reduction | Chang J.,National Engineering Laboratory for Coal Fired Pollutants Emission Reduction | Xu C.,National Engineering Laboratory for Coal Fired Pollutants Emission Reduction | Wang P.,National Engineering Laboratory for Coal Fired Pollutants Emission Reduction | And 2 more authors.
Journal of Electrostatics | Year: 2016

Electrostatic precipitators (ESPs) with the wet membrane-based collecting electrode play an important role on the flue gas cleaning process. However, the mechanism researches on the excellent collection efficiency of the membrane-based ESPs are insufficient. This paper aims at characterizing the excellent collection efficiency of the ESPs in the aspect of the electrical characteristics. The discharge current density and distribution of the metal and wet membranes collecting electrode were measured using the boundary probe method under different conditions. The differences of the discharge current density and distribution between the wet membranes collecting electrode and the metal one were discussed in detail. In addition, the effects of applied voltage, distance between the electrodes and discharge electrode construction on the difference of the discharge current density between the wet membranes electrode and the metal one were also presented. The results show that the discharge current density is strongly increased by the wet membranes electrode, the increased discharge current density is the main reason for the excellent collection efficiency of the membrane-based WESPs. © 2016 Elsevier B.V.


Chang J.,National Engineering Laboratory for Coal Fired Pollutants Emission Reduction | Dong Y.,National Engineering Laboratory for Coal Fired Pollutants Emission Reduction | Wang Z.,National Engineering Laboratory for Coal Fired Pollutants Emission Reduction | Wang P.,National Engineering Laboratory for Coal Fired Pollutants Emission Reduction | And 2 more authors.
Journal of Aerosol Science | Year: 2011

Wet electrostatic precipitators (ESPs) are good options for effective control of sulfuric acid aerosol emission. However, various problems caused by materials and non-uniform distribution of water film limited the applicability of typical wet ESPs. Research on ESP technology has tried to find more suitable and anti-corrosive methods to solve these imperfections. This research was inspired by the requirement to replace rigid collection electrode by single terylene or polypropylene fabrics. A patented system was designed, and the capillary difference between terylene and polypropylene fabrics was illustrated. Contrastive V-I curves of different collection electrodes were investigated under same conditions. The effects of several important parameters on the removal of sulfuric acid aerosol were analyzed. The results demonstrated that the variations of absorbed mass were significantly influenced by physical properties of the liquids and the structure of fabrics. The behavior of the new ESP was consistent with the typical ESP using a thimbleful of water penetrating terylene or polypropylene collection electrode via capillary flow. The collection efficiencies by terylene and polypropylene fabrics were higher than those by fiberglass reinforced plastics (FRP) under certain conditions. The collection efficiency had linear relationship with specific surface area (SCA) and mass concentration. The collection efficiency increased with increasing electric field strength, average diameter of particles and with decreasing gas temperature. As long as there was any water on the collector surface, any particle would exhibit similar collection efficiencies, whether of high resistivity or not. Experimental and theoretical investigations indicated that single terylene or polypropylene collection electrode had significant advancement which could improve wet ESP applications, such as superior performance and continuous operation ability compared with typical materials. © 2011.

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