Abstract
Electrostatic precipitators make use of corona discharge phenomena to remove airborne dust particles. Exact assessment of the electric field and charge density distribution is essential to understand the particle behavior and the flow dynamics inside the electrostatic precipitators. The Poisson and charge conservation equations were solved to evaluate the electric field and charge density distributions in the negative wire-to-duct electrostatic precipitator. In this article, a novel computation method calculating the plasma region thickness was presented with the plasma region model. Instead of the conventional Kaptzov’s hypothesis, a boundary condition for the charge density was suggested as a function of applied voltage. When the computation model and the charge boundary condition above were applied to previous experiments, the results showed good agreements with the experimental data. The estimated plasma region thickness was approximately 1.5–2.5 times greater than the wire radius in the wire radius range of 0.15 mm to 1.6 mm.
Highlights
In industrial electrostatic precipitators, the space charge density (q) and electric field strength (E) distributions in the domain between electrodes are essential for calculating particle charging and trajectory, which can be used to evaluate the precipitation efficiency
When the computation model and the charge boundary condition above were applied to previous experiments, the results showed good agreements with the experimental data
These include the Finite Difference Method (FDM) (McDonald et al, 1977; Lawless and Sparks, 1980), Finite Elements Method (FEM) (Cristina et al, 1991), Boundary Element Method (BEM) with the Method Of Characteristics (MOC) (Adamiak, 1994), FDM combined with MOC (Lami et al, 1997; Anagnostopoulos and Bergeles, 2002) and Finite Volume Method (FVM) (Neimarlija et al, 2009)
Summary
The space charge density (q) and electric field strength (E) distributions in the domain between electrodes are essential for calculating particle charging and trajectory, which can be used to evaluate the precipitation efficiency. A range of numerical methods have been used in the past to calculate the electric field and charge density distribution in a wire-to-duct precipitation system. These include the Finite Difference Method (FDM) (McDonald et al, 1977; Lawless and Sparks, 1980), Finite Elements Method (FEM) (Cristina et al, 1991), Boundary Element Method (BEM) with the Method Of Characteristics (MOC) (Adamiak, 1994), FDM combined with MOC (Lami et al, 1997; Anagnostopoulos and Bergeles, 2002) and Finite Volume Method (FVM) (Neimarlija et al, 2009). They defined the plasma region as a region where ions are generated due to electron-impact reactions and reported that the ion densities remained relatively constant inside the plasma boundary layer (Chen and Davidson, 2003)
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