The assembly removes dust particles from esp. coal-fired incinerator plant. The assembly incorporates a surface area filter (2) contained within a housing (1). Dust particles first arrive at a particle electrical charge-loader (4) before the gas and residual dust load pass to the surface area filter (2). The charge-loader (4) incorporates both active (9) and passive (8) electrodes connected to a high-voltage supply (12). The front-loader (4) is constructed as a discrete assembly which is incorporated in the passage (3) to the filter housing (1) at the point at which the effluent gas flow speed is very fast in comparison with the gas speed through the surface area filter. The active (9) and passive electrodes (8) are arranged transversely to the direction of gas flow. The active electrodes in the front charge-loader are either spray electrodes with well-defined sharp points, or wires with a small radius of bend in comparison with the passive electrodes. The active (9) and passive (8) electrodes alternate with each other in the direction of flow, and the last electrode in the direction of flow is an active electrode, and the passive electrodes (8) supply the high voltage of pref. positive potential, while the active electrodes (9) are earthed.
