초록

In the pipe-type of high intensity ionization-wet collection method and apparatus for particle removal from a gas stream, corona current is distributed between adjacent ionization and collection zones.

대표청구항 ▼

Apparatus for removing particles from a feed gas stream comprising: a vetically positioned rod electrode of curvilinear cross-section having at least one disc-shaped discharge electrode secured thereto, an outer collecting electrode tube with a gas inlet end and a gas outlet opposite end longitudina

Apparatus for removing particles from a feed gas stream comprising: a vetically positioned rod electrode of curvilinear cross-section having at least one disc-shaped discharge electrode secured thereto, an outer collecting electrode tube with a gas inlet end and a gas outlet opposite end longitudinally aligned with the rod electrode such that the outer tube inner wall and the peripheral edge of the at least one disc-shaped discharge electrode are spaced to form a first transverse gap therebetween and a second larger transverse gap between the rod electrode outer surface and said outer tube inner wall, with said rod electrode, said at least one disc-shaped discharge electrode and said outer electrode tube being sized such that: (a) at least a major portion of the rod electrode length has an equivalent diameter between 0.05 and 0.2 of the at least one disc-shaped electrode maximum diameter; (b) at least a major portion of the rod electrode length has an equivalent diameter between 0.02 and 0.1 of the outer tube inner wall equivalent diameter; (c) said peripheral edge of the at least one disc-shaped electrode is formed such that the ratio of the rod electrode equivalent diameter to the equivalent edge radius of said at least one disc-shaped electrode is between 10 and 65; direct current power supply means for imposing electric potential both: (i) between said at least one disc-shaped electrode and said outer tube inner wall such that a relatively high intensity corona field may be established in said first gap, and (ii) between said rod electrode and said outer tube inner wall such that a relatively low intensity corona field may be established in said second gap; and means for introducing liquid at the upper end to said outer tube inner wall for downward flow and particle removal from the bottom end. In a high intensity ionization method for removing particles from a feed gas stream, by flow through an outer electrode tube, in contact with a vertically positioned rod electrode of curvilinear cross-section having a multiplicity of longitudinally spaced disc-shaped discharge electrodes secured thereto with first transverse gaps between the peripheral edge of said disc-shaped electrodes and the outer tube inner wall and larger second transverse gaps between the rod electrode outer surface and said outer tube inner wall, through a series of particulate high intensity corona ionization zones in the first gaps separated by particulate collection zones in the second gaps; the improvement comprising establishing direct current electric potentials across said second gaps in each of said particulate collection zones such that electrostatic field strengths in said particulate collection zones are below the electrostatic field strengths in said ionization zones but sufficient for corona discharge current across said second gaps with the electric field strengths in said particulate collection zones decreasing in the gas flow path direction, but with the corona discharge current in said particulate collection zones increasing in the gas flow path direction.