Abstract: An example of a system for use in collecting fluid from a gas stream includes one or more collection panels and a frame for arranging the panel(s). Each of the collection panel(s) may comprise an emitter electrode assembly member, comprising one or more emitter electrodes, physically attached to an electrically insulated from a fluid collection member comprising one or more collection electrodes. The frame may be sized and shaped to be disposed near a gas outlet or a duct. An example of a method for collecting fluid from a gas stream includes providing the collection panel(s) disposed in a path of the gas stream; providing the gas stream; generating and maintaining a voltage at the one or more emitter electrodes of each of the collection panel(s); and collecting an amount of the fluid from the gas stream with the one or more collection panels.

Abstract: For the sake of improving dust removal from an electrostatic precipitator by rapping, the present disclosure proposes an electrostatic precipitator, comprising a flue gas chamber, a collecting electrode, a first rapping arrangement that raps the collecting electrode, a dust hopper, and a second rapping arrangement that raps at least one of the dust hopper and an element located within the dust hopper, wherein the second rapping arrangement is located within an inner chamber defined by the flue gas chamber and the dust hopper. The rapping by means of the second rapping arrangement may comprise rapping at least one of an inner wall of the dust hopper, a structural element located within the dust hopper and connected to at least one inner wall of the dust hopper, a rapping plate located within the dust hopper proximate to an inner wall of the dust hopper, and a baffle located within the dust hopper.

Abstract: For the sake of improving dust removal from an electrostatic precipitator by rapping, the present disclosure proposes an electrostatic precipitator, comprising a flue gas chamber, a collecting electrode, a first rapping arrangement that raps the collecting electrode, a dust hopper, and a second rapping arrangement that raps at least one of the dust hopper and an element located within the dust hopper, wherein the second rapping arrangement is located within an inner chamber defined by the flue gas chamber and the dust hopper. The rapping by means of the second rapping arrangement may comprise rapping at least one of an inner wall of the dust hopper, a structural element located within the dust hopper and connected to at least one inner wall of the dust hopper, a rapping plate located within the dust hopper proximate to an inner wall of the dust hopper, and a baffle located within the dust hopper.

Abstract: An electrostatic precipitator and a method of removal of particulates from gaseous flows. A plurality of screens, secured in sets within a central chamber in a housing, include at least one set of electrically chargeable first screens and at least one set of electrically grounded second screens. For each set of chargeable screens, all the screens of the set are provided with an identical electrical charge, either positive or negative, and the set is provided with a plurality of spikes directed at the oncoming gaseous flow. At least one screen cleaning unit selectively acts on the screens of each set. The precipitator can include a plurality of central chambers in a single housing or separate housings, and the chambers can be selectively activated or deactivated. The precipitator provides improved particulate removal from gaseous flows, including hot flows having temperatures up to at least 1200° C.

Abstract: A method of controlling operation of an electrostatic precipitator (6) is provided wherein a soot-blowing operation is performed in an upstream device. According to the method, a signal is sent to a controller (34) that a soot-blowing operation is about to be initiated in the upstream device (2). The controller (34) is operative for controlling performance of a rapping event with respect to the electrostatic precipitator (6), and causes a rapping decision (52; 152) to be made, based on receipt of the signal. The rapping decision includes establishment of a first point in time (T1) for initiating performance of a rapping event with respect to the electrostatic precipitator (6), such that said first point in time (T1) is correlated to a second point in time (T2). The second point in time (T2) is the time at which the soot-blowing operation of upstream device (2) is initiated.

Abstract: A method for removing particulate matter from a particulate-bearing gas stream includes flowing a particulate-bearing gas stream at a first volumetric flow rate to a plurality of ESP units; producing electrically charged particulate matter; collecting electrically charged particulate matter on collection electrode plates; reducing the flow through at least one of the ESP units; sequentially increasing the flow through one or more remaining ESP units in an amount so as to maintain the sum of flow through all of the ESP units at the first volumetric flow rate; subjecting the collection electrode plates in the at least one ESP unit with reduced flow to forces which dislodge the particulate matter from the collection electrode plates; collecting the dislodged particulate matter in a particulate collection receptacle; and withdrawing a gas stream of reduced particulate matter contamination.

Abstract: A method for monitoring operation of a rapper in an electrostatic precipitator using a rapper control system is described. The method includes determining model electrical characteristics of the rapper. The model electrical characteristics of the rapper correspond to model mechanical operating characteristics of the rapper. The method also includes storing data corresponding to the model electrical characteristics and the model mechanical operating characteristics of the rapper, determining actual electrical characteristics of the rapper, and comparing the actual electrical characteristics of the rapper to the stored model electrical characteristics to determine actual mechanical operating characteristics of the rapper.

Abstract: A device and method for controlling the rapping of at least one collecting electrode plate (30) of an electrostatic precipitator (1) is provided. The device controls such rapping by applying, by means of a power source (32), a voltage between at least one collecting electrode plate (30) and at least one discharge electrode (28). The sparking rate between the at least one collecting electrode plate (30) and at least one discharge electrode (28) is then measured, with the rapping of the at least one collecting electrode plate (30) controlled using the measured present sparking rate.

Abstract: A system includes a resonant frequency modeler for determining a resonant frequency of a node on a collecting plate that collects particles from a gas flow; and a wave generating device that applies a wave having an applied frequency substantially equal to the resonant frequency to the node of the collecting plate to remove particles from the collecting plate. An electrostatic precipitator (ESP) including the system and related method are also provided.

Abstract: A method and a system for controlling dust particle emissions from an electrostatic precipitator (1), which has a first and a second bus-section (16, 20), are provided. Dust particle emissions are controlled by observing that a rapping event of the first bus-section (16) is about to be initiated, verifying, before allowing the rapping event of the first bus-section (16) to be initiated, that the second bus-section (20) is ready to receive the dust particles to be released during the rapping event of the first bus-section (16), and then initiating, after verification, the rapping event of the first bus-section (16).

Abstract: The invention provides methods and apparatuses for removing aerosols and, in some cases, vapor phase contaminants, such as mercury, from a gas stream. One method is directed to the removal of additional aerosols from a gas stream from which aerosols have previously been removed by using a screen in combination with a primary aerosol collection device. Another method is directed to the removal of both aerosols and vapor phase contaminants by using a sorbent in combination with a screen. Another method is directed to the removal of vapor phase contaminants by using a catalyst to convert the contaminant to a form that is more easily removed from the gas stream and optionally injecting a chemical to increase the rate of conversion. The invention also provides various apparatuses for use in performing the various methods of the invention.

Abstract: A system includes a resonant frequency modeler for determining a resonant frequency of a node on a collecting plate that collects particles from a gas flow; and a wave generating device that applies a wave having an applied frequency substantially equal to the resonant frequency to the node of the collecting plate to remove particles from the collecting plate. An electrostatic precipitator (ESP) including the system and related method are also provided.

Abstract: This invention relates to an electrostatic precipitator suitable for removing industrial dust particles. This electrostatic precipitator with high efficiency includes a casing, in which the corona discharge electrode lines and the dust-collecting electrode plates, which form a plurality of sedimentation passages, are arranged in parallel and alternately. The vibration apparatuses for cleaning dust are placed respectively on the corona discharge electrode lines and the dust-collecting electrode plates. The wind shields are arranged alternately at both ends of each two adjacent sedimentation passages to form a plurality of air intake sedimentation passages and air exhaust sedimentation passages which are arranged alternately. The passages, where the wind shields are located on the side of air outlet are the air intake sedimentation passages and the air exhaust sedimentation passages with the wind shields located on the side of air inlet.

Abstract: Systems and methods for cleaning emitter electrodes of air conditioner systems are provided. The air conditioning system includes an emitter electrode, a collector electrode and a high voltage generator to provide a high voltage potential difference between the emitter and collector electrodes. The system also includes a cleaning member having a channel through which the emitter electrode passes. A plunger mechanism and a spring, or a lever and a fulcrum, are used to force the cleaning member to travel upward along the emitter electrode to thereby frictionally removing debris from the emitter electrode. This description is not intended to be a complete description of, or limit the scope of, the invention. Other features, aspects, and objects of the invention can be obtained from a review of the specification, the figures and the claims.

Abstract: This invention relates to an electrostatic precipitator suitable for removing industrial dust particles. This electrostatic precipitator with high efficiency comprises a casing, in which the corona discharge electrode lines and the dust-collecting electrode plates, which form a plurality of sedimentation passages, are arranged in parallel and alternately. The vibration apparatuses for cleaning dust are placed respectively on the corona discharge electrode lines and the dust-collecting electrode plates. The wind shields are arranged alternately at both ends of each two adjacent sedimentation passages to form a plurality of air intake sedimentation passages and air exhaust sedimentation passages which are arranged alternately. The passages, where the wind shields are located on the side of air outlet are the air intake sedimentation passages and the air exhaust sedimentation passages with the wind shields located on the side of air inlet.

Abstract: The invention provides methods and apparatuses for removing additional aerosols and in some cases additional particulate matter from a gas stream, wherein a certain portion of such aerosols and particulate matter has already been removed using a primary aerosol and particulate collection device. In some embodiments, the invention includes a method for removing additional aerosols from a gas stream, including passing a gas stream having a plurality of aerosols through a gas duct; removing a first portion of the plurality of the aerosols using a primary aerosol collector; passing the gas steam through a screen; collecting at least a second portion of the plurality of aerosols on the screen; and cleaning a portion of the screen outside of the gas duct. The invention also provides various apparatuses for use in performing the method of the invention.

Abstract: An improved ventilating range hood includes a sheet metal collecting hood, vented to the outdoors; a variable speed, electronically controllable fan, mounted in such a way as to draw air from a cooking area and out through said vent of said collecting hood; a plurality of air quality sensors capable of detecting both comfort factors and the presence of hazardous substances in the air; an embedded control algorithm which examines the composite output of said discrete air quality sensors, as well as, the trend information and determines from said information an instantaneous ventilation requirement, and a control signal, derived from said algorithm to regulate the fan speed level such that every combination of discrete air quality sensor conditions will have a unique associated fan speed level based on said ventilation requirement. The air quality sensors may include sensors for temperature, humidity, carbon monoxide, smoke, etc.

Abstract: A wet electrostatic precipitator is disclosed to include a condensation-growth chamber, a precipitation chamber connecting with the condensation-growth chamber, three dual-sleeve members mounted in the precipitation chamber, three discharge electrodes connecting with the dual-sleeve members, two insulating members covering on the inner surface of the precipitation chamber, and two ground electrodes mounted on the outside of the precipitation chamber. Thus, a uniform water film is formed on the surface of the insulating members to wash away the particles from waste gas. The condensation-growth chamber is provided for the particles to grow therein and thereby enhances the collection efficiency. The insulating member acts as a shield between the discharge electrodes and the ground electrodes and thereby avoids a short circuit or sparks.

Abstract: A method for the acceleration of an electromagnetic rapper, particularly for an electrostatic precipitator, which includes a metal cylinder as a hammer, an electrical coil for lifting the metal cylinder and a coil energizer for energizing the electrical coil. For cleaning a surface the metal cylinder is lifted by an initial electrical pulse generated by the coil energizer. The coil energizer supplies the electrical coil with an additional electrical pulse so that the metal cylinder is accelerated when it has reached the maximum point of its trajectory.

Abstract: A method for the acceleration of an electromagnetic rapper, particularly for an electrostatic precipitator, which includes a metal cylinder as a hammer, an electrical coil for lifting the metal cylinder and a coil energizer for energizing the electrical coil. For cleaning a surface the metal cylinder is lifted by an initial electrical pulse generated by the coil energizer. The coil energizer supplies the electrical coil with an additional electrical pulse so that the metal cylinder is accelerated when it has reached the maximum point of its trajectory.

Abstract: A gas separation apparatus using electrostatic precipitators and mechanical rappers is enhanced by the addition of an opposite polarity refreshing power supply and a switching arrangement. The switching components selectively disconnect the primary power supply and connect the refreshing power supply to the electrostatic precipitator, causing an electrical impulse in the precipitator sufficient to dislodge precipitate from the collector plates. In one embodiment, an RC filter is further provided to control the impulse and reduce the burden that would otherwise be placed upon the refreshing power supply. In a second embodiment, a pair of SCR strings serve as the switches. Cleaning power is delivered from a capacitor through one of the SCR strings using a resonant circuit, the resonance which causes the SCR string to commutate off after the impulse has been delivered.

Abstract: The present invention relates to a filter device for separating particles from a gaseous fluid sucked in by a gas turbine, the filter device having a vertically situated tubular electric filter. Maintenance work on a gas turbine may thus be significantly reduced and, in addition, a higher gas turbine output may be achieved due to low pressure loss of the tubular electric filter.

Abstract: A system (10) for monitoring an operating condition of an electrostatic precipitator rapper system (12) includes a rapper (24) configured to mechanically actuate to disengage pollutants from a plate of the electrostatic precipitator (12). The system also includes a sensor (38, 40) configured to obtain and transmit signals representative of vibration, motion, or current behavior of the rapper; and a processor (52) configured to receive the signals from the sensor and to detect whether the rapper is mechanically actuated.

Abstract: A method of forming a modular collecting electrode for an electrostatic precipitator, including forming a plurality of horizontal collecting electrode sections, each section having vertical planar portions separated by vertical tubular portions, and wherein the method includes inserting interconnecting support elements into the tubular portions of adjacent collector electrode sections and compressing the interconnected electrode sections to form a rigid modular assembly. In one preferred embodiment, the method includes applying stiffening members across the ends of the planar portions of adjacent electrode sections for transmitting rapping forces through the assembled sections.

Abstract: The invention relates to a method of cleaning an electric filter and to an electric filter. In the method gas containing particles is fed to a chamber (2) of the electric filter. The gas is further fed to gas channels (5) in an emission system (3) provided in the chamber (2). What is brought about is electric charging of the particles in the gas and attachment to the separation electrode (1). Gas purified of particles is removed from the gas channel (5). The separation electrode (1) is shaken with shaker (8) to remove the particles attached to the separation electrode (1) therefrom. In this method, the gas flow is limited in such a gas channel (5) which adjoins the separation electrode (1) to be shaken by the shaker (8) when the separation electrode (1) to be shaken by the shaker (8) is shaken.

Abstract: A gas separation apparatus using electrostatic precipitators and mechanical rappers is enhanced by the addition of an opposite polarity refreshing power supply and a switching arrangement. The switching components selectively disconnect the primary power supply and connect the refreshing power supply to the electrostatic precipitator, causing an electrical impulse in the precipitator sufficient to dislodge precipitate from the collector plates. An RC filter is further provided to control the impulse and reduce the burden that would otherwise be placed upon the refreshing power supply. The novel separation apparatus and technique offer particular synergy when applied to the effluent stream from a coal-fired electric power plant or other similar gas streams.

Abstract: A gas separation apparatus using electrostatic precipitators and mechanical rappers is enhanced by the addition of an opposite polarity refreshing power supply and a switching arrangement. The switching components selectively disconnect the primary power supply and connect the refreshing power supply to the electrostatic precipitator, causing an electrical impulse in the precipitator sufficient to dislodge precipitate from the collector plates. An RC filter is further provided to control the impulse and reduce the burden that would otherwise be placed upon the refreshing power supply. The novel separation apparatus and technique offer particular synergy when applied to the effluent stream from a coal-fired electric power plant or other similar gas streams.

Abstract: A bow-reduced precipitator collector plate assembly and an appertaining method include a precipitator collector plate that contacts a spring-like stiffening element configured to be attached to a fixed anchor or an adjacent anchoring collector plate. The stiffening element is configured to apply a force in a direction normal to a primary plane, which is generally co-linear but opposite in direction of a direction of bowing, of the precipitator collecting plate.

Abstract: An dry horizontal flow electrostatic precipitator wherein a portion of the gas flow passing through the precipitator is extracted from the upper portion of the casing, such extraction flow having a lower particle concentration than gas flow at the bottom portion of the casing due to re-entrainment. The extraction gas flow is extracted by a manifold positioned at the top of the casing.

Abstract: An improved method and system is provided to control the rapping process used to clean the internal collection plates and discharge electrodes of electrostatic precipitators. The system obtains the performance characteristics of a first rapper and calculates a rapper lift value. The system then obtains performance characteristic data from two or more additional rappers and calculates rapper lift values for each of the rappers. Finally, the system compares the rapper lift value of each additional rapper and adjusts its performance characteristics so that it substantially approximates the performance characteristics of the first rapper.

Abstract: An improved method and system is provided to control the rapping process used to clean the internal collection plates and discharge electrodes of electrostatic precipitators. The system obtains the performance characteristics of a first rapper and calculates a rapper lift value. The system then obtains performance characteristic data from two or more additional rappers and calculates rapper lift values for each of the rappers. Finally, the system compares the rapper lift value of each additional rapper and adjusts its performance characteristics so that it substantially approximates the performance characteristics of the first rapper.

Abstract: The apparatus includes a wet electrostatic precipitator (ESP) field disposed along a combusted fossil-fuel flue gas stream path downstream of a dry ESP field. The wet ESP field includes a chamber having a flue gas inlet and a flue gas outlet, and at least one collection plate positioned within the chamber. The chamber also includes one or more wash nozzle positioned adjacent the collection plate, and a wet hopper positioned substantially under the collection plate. The apparatus preferably further includes one or more cooling nozzles positioned near the flue gas inlet. The cooling and wash nozzles are fluidly coupled to a water source, while the wet hopper is fluidly coupled to either a pH adjustment module or a treatment processor. A method of removing contaminants from a flue gas stream using the above apparatus is also disclosed.

Abstract: This invention relates to an apparatus and method to electrostatically charge or neutralize particles conveyed in a pneumatic stream. More particularly the invention is drawn to an apparatus that has at least two longitudinal chambers separated from each other with a plate electrode. Within each chamber is at least one corona charging electrode with multiple discharge points and at least one power level zone. The apparatus divides a single gas stream into a multiple streams where corona discharge polarizes or neutralizes particles with a similar or dissimilar polarity causing coalescing or separation of the particles as they exit the charging chambers.

Abstract: An electrostatic precipitator for removing suspended particles from a gas stream that directs at least a portion of such gas stream upwardly at the precipitator inlet. This causes the gas flow near the bottom of the treatment zone in the precipitator to have a lower velocity. The gas flow near the bottom has a greater number of suspended particles as particles dislodged from the gas flow above may re-enter the gas flow at a point below. The slowed gas flow is in contact with the treatment zone for a longer period of time, thereby allowing for more particles to be dislodged.

Abstract: This invention provides a flue gas treating process for removing sulfur oxides and dust from exhaust gas containing sulfur oxides and dust by using an absorption tower into which an absorbing fluid containing an alkaline agent is sprayed, comprising the steps of equipping the absorption tower with integrally formed dust collection means comprising dust collecting plates and discharge electrodes, and with dust separation means for sweeping off the dust collected by the dust collection means; and treating the exhaust gas in the dust collection means and subsequently cleaning the exhaust gas in the absorption tower, whereby desulfurization and dust removal are effected while sweeping off the collected dust by the dust separation means. Thus, desulfurization and dust removal can be effected in a simple manner, and the capacity of an electrostatic precipitator installed on the upstream side can be reduced.

Abstract: A device and method for controlling particulate air pollutants of the present invention combines filtration and electrostatic collection devices. The invention includes a chamber housing a plurality of rows of filter elements. Between each row of filter elements is a grounded plate. Between the grounded plates and the filter elements are electrode grids for creating electrostatic precipitation zones between each row of filter elements. In this way, when the filter elements are cleaned by pulsing air in a reverse direction, the dust removed from the bags will collect in the electrostatic precipitation zones rather than on adjacent filter elements.

Abstract: Electrostatic filter in which the enclosure (2) is fitted with a flexible membrane (12) , behind which an acoustic wave generator (14) is placed and which vibrates the gaseous contents of the filter to detach retained dust and clean the filter.

Abstract: An apparatus and method for reducing the amount of unburned carbon in raw flyash, wherein raw flyash containing unburned carbon is introduced into the tribocharger, the tribocharger producing positive and negative surface charges on the respective particles of carbon and flyash, introducing the charged particles into an electrical field containing positively and negatively charged plates, the positively and negatively charged particles being collected on the negatively and positively charged plates, and selectively vibrating the plates to selectively recover the unburned carbon and flyash.

Abstract: The invention relates to a device for rapping electrodes, preferably collecting electrodes, in a high voltage supplied electrostatic precipitator. The device has at least one piezo electric element adapted to supply a rapping impact to at least one electrode at a predetermined level and frequency.

Abstract: An anvil arrangement for receiving rapper impacts and transmitting them to a discharge electrode of a precipitator has an electrode tube made of deformable material, having an open end and forming part of the discharge electrode. An anvil having a head and a shank is connected to the head and the shank has a size for insertion into the open end of the tube. The head is larger than the tube for engagement against the open end of the tube. The shank has a recess therein and at least one crimp in the tube near the open end thereof and in the vicinity of the recess of the shank for retaining the anvil to the tube. An alternate embodiment receives the electrode tube therein and engages the tube with an angled groove.

Abstract: An apparatus is disclosed for improving the performance of a high voltage, rapper-type precipitator having a supply electrode and a rapper rod passing through a grounded precipitator roof and attached to an array of discharge electrodes. Alumina insulation sleeves are installed over the supply electrodes and rapper rods to prevent sparking to the grounded precipitator roof. A shock absorber is provided on the lower end of the insulator to prevent damage to the insulator during precipitator rapping.

Abstract: A system for controlling an electrostatic precipitator adapted to be powered by an alternating power source includes a regulator for regulating at least one precipitator operating parameter in response to at least one control signal, a measurement circuit coupled to the precipitator for providing measurement signals corresponding to at least precipitator secondary voltage and precipitator secondary current. A processor coupled to the measurement circuit and to the regulator generates the control signals.

Abstract: Disclosed is an exhaust gas purifying apparatus for an automobile diesel engine including a pair of electrodes disposed at a predetermined interval in an exhaust path of an automobile diesel engine, and a high voltage power source for applying a high voltage to the pair of electrodes whereby an electric field is generated in a space between the pair of electrodes so as to collect diesel particulates. Since the diesel particulates emitted from a diesel engine are charged heavily in negative, and since the exhaust gas purifying apparatus forms an electric field between the pair of electrodes, the diesel particulates are collected on one of the pair of electrodes.