Patent ID: 7621986

Claim:
An electrostatic ionization system in a precipitation device for purifying a gas stream passing through it, comprising: an electrically conductive plate connected to an electrical reference potential, the plate disposed across an open cross section of a flow conduit of the precipitation device and including a plurality of nozzles configured for passage of the gas stream; a sleeve positive-fittingly disposed on each nozzle coaxial with an axis of the nozzle, the sleeve protruding on both sides of the plate and being an electrical reference potential of the plate; an electrically insulated high-voltage grid disposed downstream or upstream of the plate across the open cross section of the conduit, the high-voltage grid being connected to a high-voltage potential via a passthrough in a wall of the conduit; a plurality of rod-shaped high-voltage electrodes each having an end connected to the high-voltage grid and an exposed free end arranged identically centrally in a corresponding one of the nozzles, the electrodes each forming a circumferential gap and arranged at the electrical potential of the high-voltage grid, wherein the free end of each of the electrodes is exposed downstream after the corresponding nozzle, wherein a wall of each sleeve is permeable to the gas stream and includes at least one of a grid, a perforated sheet and individual rods equidistantly spaced from each other and having free ends terminating in a holding ring.