Gas separation: processes – With control responsive to sensed condition – Electric or electrostatic field
Reexamination Certificate
1999-03-30
2001-02-27
Chiesa, Richard L. (Department: 1724)
Gas separation: processes
With control responsive to sensed condition
Electric or electrostatic field
C055SDIG003, C095S073000, C096S074000, C096S100000
Reexamination Certificate
active
06193782
ABSTRACT:
The present invention relates generally to condensing wet electrostatic precipitators and pertains, more specifically, to a modular arrangement for improving the construction and performance of condensing wet electrostatic precipitators.
The continuing pursuit of more stringent regulations pertaining to the control of contaminants emitted into the ambient atmosphere has led to the requirement for more effective treatment of emissions emanating from commercial and industrial processes. In particular, the removal of toxic substances from industrial exhausts has received increased attention. Recent studies have suggested that the presence of submicron particles cause much of the illnesses associated with air pollution. Accordingly, greater emphasis has been placed upon the removal of such fine particulates from industrial exhausts.
One of the more recent advancements in the removal of fine particulates from a gas stream is the utilization of condensing wet electrostatic precipitators wherein the particulates carried by an incoming gas stream are entrained in condensate formed on walls of the precipitator and are flushed from the walls for collection. The present invention provides improvements in the construction and operation of condensing wet electrostatic precipitators. As such, the present invention attains several objects and advantages, some of which are summarized as follows: Facilitates the fabrication and installation of a condensing wet electrostatic precipitator, enabling more economical construction and encouraging more widespread use of condensing wet electrostatic precipitators; enables ease of maintenance and repair of condensing wet electrostatic precipitators, with reduced shutdown requirements and extended continuous operation; allows the use of less expensive materials and construction techniques in the fabrication and installation of condensing wet electrostatic precipitators; utilizes a heat exchange arrangement which increases the effectiveness and efficiency of heat transfer in cooling the condensing walls of a condensing wet electrostatic precipitator; provides better control over the temperature of the walls of the condensing electrodes in a condensing wet electrostatic precipitator for providing better control over conditions desired for the formation of particle-capturing and flushing condensate, thereby increasing the efficiency and effectiveness of the condensing wet electrostatic precipitator in the removal of particulates; allows the construction and installation of larger condensing wet electrostatic precipitators with increased ease and economy; facilitates the fabrication of components of a condensing wet electrostatic precipitator in the factory and assembly in the field to enable greater ease and economy; provides apparatus and process for effective and reliable operation over an extended service life.
The above objects and advantages, as well as further objects and advantages, are attained by the present invention which may be described briefly as an improvement in a wet electrostatic precipitator having discharge electrodes extending within generally tubular collection electrodes placed within a cooling jacket containing a cooling medium for cooling the collection electrodes as hot gases are passed through the collection electrodes, the improvement comprising: collection electrode modules for establishing the collection electrodes and the 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; the configuration of each collection electrode module being such that upon assembly of the collection electrode modules into an assembly of juxtaposed collection electrode modules the part-tubular sections are juxtaposed to establish at least one corresponding generally tubular collection electrode comprised of the juxtaposed part-tubular sections and the cooling fluid chambers are juxtaposed to establish a corresponding cooling jacket comprised of the juxtaposed cooling fluid chambers.
In addition, the present invention includes a method for improving the operation of a wet electrostatic precipitator having discharge electrodes extending within generally tubular collection electrodes placed within a cooling jacket containing a cooling medium for cooling the collection electrodes as hot gases are passed through the collection electrodes, the method comprising: providing discrete cooling fluid chambers associated with corresponding collection electrodes for containing cooling medium for cooling the corresponding collection electrodes; and distributing cooling fluid among the discrete cooling fluid chambers in response to temperature demands at the collection electrodes to regulate the temperature within at least some of the cooling fluid chambers independent of the temperature of others of the cooling fluid chambers.
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Starke et al, “The Wet Wall Electrostatic Precipitator.” Undated.
Chiesa Richard L.
Croll Reynolds Clean Air Technologies, Inc.
Jacob Arthur
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