The United States of America as Represented by the Administrator of the

Government of the United States as Represented by Administrator

The United States Goverment as Represented by the Administrator of the

Norman Plaks

Leslie E Sparks

Charles B Sedman

Ronald B Mosley

Louis S Hovis

Bobby E Daniel

An electrostatic bag filter unit is formed of a plurality of sections arranged in series. One section is a bag filter section containing a plurality of parallel elongated filter fabric bag elements extending across and traverse to a gas flow path therethrough and a plurality of grounded, electrically-conductive support frames, each support frame being internal to and supporting one of the filter fabric bag elements. Optionally, the bag filter section may further include a plurality of non-discharging electrodes disposed parallel to and interspersed among the filter fabric bag elements. A filter precharger section is located immediately upstream of and contiguous with the bag filter section and is formed of a linear array of alternating corona discharge electrodes and grounded electrodes arranged perpendicular to the gas flow path.

Enhancement of electrostatic precipitation with precharged particles and

A novel electrostatic precipitator includes an electrostatic collector section with discharge electrodes positioned between pairs of grounded collector electrodes, a gas entry port located upstream of said electrostatic collector section, and a transition section between the gas entry port and said electrostatic collector section into which an aqueous acid gas neutralizing agent is sprayed into a gas stream. An additional collector section may be interposed between the gas entry port and the point where the acid gas neutralizing agent is injected into the gas stream. The collector section may comprise alternating charging and short collection sections in which the grounded electrodes of adjoining charger and collector sections are connected. A liquid spray removes particulates collected on the grounded electrodes of the collector sections.

Electrostatic precipitator for collection of multiple pollutants

An electrostatic precipitator includes a plurality of collector sections having parallel collection plates, defining gas flow lanes therebetween, and a bag filter section containing a plurality of parallel, elongated filter fabric bag elements. A plurality of corona discharge wires for charging solid particulates entrained in the gas flow entering the bag filter section are disposed parallel to and interspersed among the bag elements. Both the bag elements and the corona discharge wires within the bag filter section depend from a common plate member. Gas flow is from the outside of the bag elements to the inside and out through apertures in the supporting plate.

Enhancement of electrostatic precipitation with electrostatically

The novel ESP has a plurality of collector sections alternating in series with a plurality of prechargers (charging sections) with each collector section being preceded by a charging section. Each collector section contains a plurality of collection plates spaced by a distance d to define a plurality of gas flow lanes therebetween. Each gas flow lane contains 1-4 corona discharge wires aligned parallel to the gas flow. Each charging section contains a plurality of corona discharge electrodes alternating with anodes in an array transverse to the gas flow. Each collector section is much shorter than in the prior art, both in actual length and in relation to the length of the length of the charging section and the interplate spacing d.

Electroprecipitator with alternating charging and short collector

A simple electrostatically enhanced fabric filtration system for removing fine particulate matter or dust entrained in a gas flow, has a single, elongate, central, corona-generating electrode positioned within a cylindrical fabric filter, closed at one end, into which the particulate bearing gas flow is directed. In one embodiment, a grid-like cylindrical grounded electrode is disposed proximately outside the filter element and establishes a radially directed electrostatic field with the corona electrode. Particles passing through the corona acquire charges of like polarity and are subjected immediately to Coulombic forces driving them radially outward toward the filter fabric where they collect prominently near the filter element inlet, thus allowing easier passage to the gas further downstream. Other embodiments have a plurality of grounded electrodes attached to the inside of the filter element or as wires woven therethrough. Corona concentration near the filter element entrance by known techniques, e.g., roughening, addition of points to, or by changes in cross-section of the corona electrode, can also be utilized to further enhance all embodiments.

Enhanced fabric filtration through controlled electrostatically

The cost-effectiveness of sulfur oxides and particulate matter removal is improved by placing a sulfur oxides or other acidic gases removal system and a multi-stage electrostatic precipitator within a single housing. The sulfur oxides or other acidic gas removal system works by spraying a neutralizing slurry or solution into incoming flue gas to form neutral salts which dry in a reaction zone provided between the sulfur oxides or other acidic gas removal system and the electrostatic filtration module. This system also provides for simple retrofitting of existing systems to include SO.sub.2 or other acidic gas removal systems.

Combined electrostatic precipitator and acidic gas removal system

Apparatus and method are provided for reducing rapping reentrainment from a conventional electrostatic precipitator. Thus, the apparatus will include a conventional electrostatic precipitator having at least one main electrical section and, in sequence downstream of the main electrical section, a precharger and a reentrainment collector. The precharger has a tubular anode aligned with collection plates in the main electrical section and a corona discharge wire aligned with the corona discharge wires of the main electrical section. The reentrainment collector includes collection plates substantially shorter than the collection plates of the main electrical section with at least one corona discharge wire in each of the gaps between the collection plates. The secondary collection plates of the reentrainment collector are operated at a current density 75% or less of the current density at which the main collector plates are operated.

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Raleigh, NC, United States of America

Norman Plaks