Finite Element Solution for Ionized Fields in a DC Electrostatic Precipitator

B. Benamar1, E. Favre2, A. Donnot1, and M. O. Rigo1
1 Laboratoire LERMAB, Faculté des Sciences et Techniques de Nancy, UMR, Vandoeuvre-lès-Nancy, France
2 COMSOL France, Grenoble, France

This paper presents the finite element solution for ionized fields in the coaxial cylinders configuration during the positive corona discharge using COMSOL Multiphysics. The coupled differential equations describing a monopolar DC corona are completely solved by using three application modes:

  • PDE (General Form) mode for electric potential distribution,
  • PDE (General Form) mode for space charge density equation,
  • PDE (Weak Form, boundary) mode used to impose the constraint for electric potential at coronating conductor boundary.

The spatial distributions for the electric field, the electric potential, and the space charge density are computed and compared with the analytical solution. The current-voltage characteristic, obtained by means of the computational procedure, is in good agreement with the experimental data obtained on a laboratory scale electrostatic precipitator.