Abstract: Known wet electrostatic precipitators are large and inefficient. The present invention enables the production of smaller, more efficient and long lasting wet electrostatic precipitators by the addition of a central bore in the inner electrode through which a first purge flow is passed and directed into the precipitator chamber, perpendicular to the direction of flow of the gas to be treated through the chamber to urge the particulate into the water curtain. A second, larger, cleaning purge flow is also provided to disturb the water curtain such that it cleans the inner electrode of any deposited particulate.

Abstract: In order to increase the operable range of a DC plasma torch in an abatement apparatus, the apparatus comprises a power control configured for controlling the power of the plasma torch by selective control of the plasma source gas flow regulator.

Abstract: Known wet electrostatic precipitators are large and inefficient. The present invention enables the production of smaller, more efficient and long lasting wet electrostatic precipitators by the addition of a central bore in the inner electrode through which a first purge flow is passed and directed into the precipitator chamber, perpendicular to the direction of flow of the gas to be treated through the chamber to urge the particulate into the water curtain. A second, larger, cleaning purge flow is also provided to disturb the water curtain such that it cleans the inner electrode of any deposited particulate.

Abstract: An apparatus for treating a gas stream. A plasma generator generates a plasma flare. A first inlet conveys the gas stream into the apparatus. A reaction chamber is located downstream of the plasma generator in which gas is treated. A second inlet receives a liquid into the apparatus for establishing a liquid weir over an interior surface of the reaction chamber for resisting accumulation of solid deposits on the interior surface. A weir guide has an outer annular surface for directing liquid over the interior surface and an inner annular surface in flow communication with the outer surface so that liquid flows form the outer surface to the inner surface to resist depositing on the inner surface.

Abstract: In an apparatus for treating a gas stream, a plasma generator comprises an electrode for energizing a source gas to generate a plasma flare by application of a high voltage. An inlet allows the gas stream into the apparatus and directs it into the generated plasma. A scraper is fitted for reciprocating movement from a first position to a second position for scraping a surface to remove solid deposits accumulated on the surface.

Abstract: An apparatus for treating a gas stream includes a plasma abatement device that has a reaction chamber and a plasma torch for generating a plasma stream for injection into the chamber for treating the gas stream. A first inlet conveys a gas stream into the plasma abatement device for treatment, and a second inlet, in a normal condition of the apparatus, is in flow communication with a source of reagent for conveying a reagent into the plasma device for improving the efficiency of the treatment. In a back-up condition of the apparatus, the second inlet is in flow communication with a gas stream source for conveying a gas stream into the device for treatment.

Abstract: To lengthen the service period on DC plasma abatement devices a modified DC plasma torch is provided with an electrically conductive cathode and an electrically conductive anode spaced apart from one another to form a gap therebetween; a metal swirl bush at least partially located within the gap and comprising a channel adapted to permit, in use, a gas to flow through the gap; and a ceramic element interposed between any one or more of: the cathode and the swirl bush; and the anode and the swirl bush.

Abstract: An apparatus for treating a gas stream includes a plasma abatement device that has a reaction chamber and a plasma torch for generating a plasma stream for injection into the chamber for treating the gas stream. A first inlet conveys a gas stream into the plasma abatement device for treatment, and a second inlet, in a normal condition of the apparatus, is in flow communication with a source of reagent for conveying a reagent into the plasma device for improving the efficiency of the treatment. In a back-up condition of the apparatus, the second inlet is in flow communication with a gas stream source for conveying a gas stream into the device for treatment.

Abstract: In order to increase the operable range of a DC plasma torch in an abatement apparatus, the apparatus comprises a power control configured for controlling the power of the plasma torch by selective control of the plasma source gas flow regulator

Abstract: To lengthen the service period on DC plasma abatement devices a modified DC plasma torch is provided with an electrically conductive cathode and an electrically conductive anode spaced apart from one another to form a gap therebetween; a metal swirl bush at least partially located within the gap and comprising a channel adapted to permit, in use, a gas to flow through the gap; and a ceramic element interposed between any one or more of: the cathode and the swirl bush; and the anode and the swirl bush.