Abstract:
Apparatus and method for removing particulates and corrosive gases from a gas stream includes the serial use of a condensing wet electrostatic precipitator section for removing smaller particulates, in the submicron range, in conjunction with a vertically aligned preliminary scrubber section which removes larger particulates, in the micron range, and corrosive gases, in an integrated unit in which the temperature and moisture conditions in the gas stream are controlled for assuring effective and efficient operation of the condensing wet electrostatic precipitator section. Discharge electrodes of the electrostatic precipitator are supported by insulators which are protected against deleterious deposits of particulates by discharge electrode elements and collector electrode elements placed between the gas stream and the insulators.
Abstract:
An apparatus for removing particulate matter from a gas stream containing particulate matter, the apparatus comprising: a mist-producing element that mixes a gas stream entering the apparatus with liquid droplets; and a down flow Wet Electrostatic Precipitator (WESP) pass section having ionizing electrodes that electrically charge the particulate matter and the intermixed liquid droplets, and collecting surfaces in the form of an array of polygonal tubes, wherein the collecting surfaces are under the influence of an electrical field to attract and remove electrically-charged particulate matter and intermixed liquid droplets from the gas stream. An embodiment utilizing two down-flow Wet Electrostatic Precipitator (WESP) sections (i.e., a first pass section and a second pass section), each of which includes ionizing electrodes that electrically charge the particulate matter and the intermixed liquid droplets, and collecting surfaces in the form of an array of polygonal tubes, wherein the collecting surfaces are under the influence of an electrical field to attract and remove electrically-charged particulate matter and intermixed liquid droplets from the gas stream is also disclosed, as is a method for removing particulate matter.
Abstract:
Certain contaminants are removed from a stream of contaminant-laden commercial and industrial exhaust gases conducted through an electrostatic precipitator by passing a reagent fluid through corona discharge active zones to activate the reagent fluid as the reagent fluid is injected into the stream such that the activated reagent fluid reacts with the contaminant to be removed. A combination discharge electrode and injector carries a plurality of electrode elements which establish the corona discharge active zones and include injector passages juxtaposed with the corona discharge active zones. The reagent fluid is injected into the stream by delivering the reagent fluid through the injector passages such that the reagent fluid passes through the corona discharge active zones and is activated as the reagent fluid is injected into the stream.
Abstract:
A condensing wet electrostatic precipitator for cleaning hot gases is constructed of collection electrode modules which establish longitudinally extending collection electrodes and a cooling jacket, each collection electrode module having a configuration including at least one part-tubular section and a cooling fluid chamber integral with the part-tubular section for containing cooling medium for cooling the part-tubular section. In some arrangements, the collection electrode modules are spaced apart laterally to enable the passage of the hot gases through the collection electrodes in a direction transverse to the longitudinal direction in which the collecting electrodes extend.
Abstract:
The invention is an air pollution control apparatus for cleaning exhaust gases from motor vehicles using both electrostatic precipitation and a non-thermal plasma. The precipitator is especially useful in cleaning exhaust gases from diesel engines. The precipitator provides for easier cleaning in between uses, as well as a more efficient cleaning of exhaust gases. The air pollution control apparatus of the present invention is configured as two pass system whereas each pass is designed as multistage horizontal plate type electrostatic precipitator. The first pass applies a direct current, consistent voltage for particle collection through electrostatic precipitation. The second pass uses spiked voltage, non-thermal plasma generation for the production of free radicals to oxidize toxic gases, and with the addition of a diesel oxidation catalyst to transform harmful molecular compounds in the exhaust gas into safe gases.
Abstract:
The invention is an air pollution control apparatus for cleaning exhaust gases from motor vehicles using both electrostatic precipitation and a non-thermal plasma. The precipitator is especially useful in cleaning exhaust gases from diesel engines. The precipitator provides for easier cleaning in between uses, as well as a more efficient cleaning of exhaust gases. The air pollution control apparatus of the present invention is configured as two pass system whereas each pass is designed as multistage horizontal plate type electrostatic precipitator. The first pass applies a direct current, consistent voltage for particle collection through electrostatic precipitation. The second pass uses spiked voltage, non-thermal plasma generation for the production of free radicals to oxidize toxic gases, and with the addition of a diesel oxidation catalyst to transform harmful molecular compounds in the exhaust gas into safe gases.
Abstract:
An apparatus and method for removing particulate matter and undesirable vapors from a gas stream are provided. In one aspect, an apparatus includes at least one ionizing electrode that negatively charges the particulate matter and condensed droplets of undesirable vapors, at least one scrubbing element including a collecting surface, and at least one liquid applicator operable to apply a liquid film to the collecting surface, wherein a positive charge is applied to the liquid film to attract negatively-charged particulate matter and/or condensed droplets of undesirable vapors to the collecting surface. In another aspect, a method includes the steps of: negatively charging the particulate matter and condensed droplets of undesirable vapors using at least one ionizing electrode; applying a liquid film to a collecting surface proximate the ionizing electrode; and positively charging the liquid film to attract the negatively-charged particulate matter and condensed droplets of undesirable vapors.
Abstract:
An apparatus for removing particulate matter from a gas stream containing particular matter, the apparatus comprising: a mist-producing element that mixes a gas stream entering the apparatus with liquid droplets; a down-flow Wet Electrostatic Precipitator (WESP) section comprising ionizing electrodes that electrically charge the particulate matter and the intermixed liquid droplets, and collecting surfaces under the influence of an electrical field which attract and remove electrically-charged particulate matter and intermixed liquid droplets from the gas stream; and an up-flow WESP section comprising electrically-charged ionizing and collecting electrodes that remove, from the gas stream, substantially all fine-sized droplets generated in the down-flow WESP section.
Abstract:
An apparatus for removing particulate matter from a biomass combustion gas stream, the apparatus having a mist-producing element that mixes a gas stream entering the apparatus with liquid droplets; a Wet Electrostatic Precipitator (WESP) section that includes ionizing electrodes that electrically charge the particulate matter and the intermixed liquid droplets and collecting surfaces under the influence of an electrical field which attract and remove electrically-charged particulate matter and intermixed liquid droplets from the gas stream; and a scrubbing section that provides for additional scrubbing of the gas.
Abstract:
An apparatus for removing particulate matter from a gas stream containing particulate matter, the apparatus including: a mist-producing element that mixes a gas stream entering the apparatus with liquid droplets; and a down flow Wet Electrostatic Precipitator (WESP) pass section having ionizing electrodes that electrically charge the particulate matter and the intermixed liquid droplets, and collecting surfaces in the form of an array of polygonal tubes, wherein the collecting surfaces are under the influence of an electrical field to attract and remove electrically-charged particulate matter and intermixed liquid droplets from the gas stream. An embodiment utilizing two down-flow Wet Electrostatic Precipitator (WESP) sections (i.e., a first pass section and a second pass section), each of which includes ionizing electrodes that electrically charge the particulate matter and the intermixed liquid droplets, and collecting surfaces in the form of an array of polygonal tubes, wherein the collecting surfaces are under the influence of an electrical field to attract and remove electrically-charged particulate matter and intermixed liquid droplets from the gas stream is also disclosed, as is a method for removing particulate matter.