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Anatol Jaworek - One of the best experts on this subject based on the ideXlab platform.
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hybrid electrostatic filtration systems for fly ash particles emission control a review
Separation and Purification Technology, 2019Co-Authors: Anatol Jaworek, A Marchewicz, A T Sobczyk, A Krupa, T Czech, L śliwinskiAbstract:Abstract The removal of submicron and nanoparticles from flue gases emitted by coal fired boilers is the subject of extensive studies in recent years. Electrostatic Precipitators and fibrous filters are the most commonly used gas-cleaning devices for the removal of these particles in power plants and industry. However, the collection efficiency of electrostatic Precipitators decreases for particles smaller than 1 µm. Fibrous filters provide higher filtration efficiency for particles of this size, but the pressure drop is higher, and additional energy is needed to supply the outlet fan. Recently, special attention of engineers has been given to hybrid constructions, which apply electrostatic fields and forces in order to improve the performances of bag filters. There are three types of such solutions, which have been investigated in the literature: (1) electrically energized filter, in which fibres of the filter are energized by an electric field; (2) hybrid electrostatic filter, which applies electrostatic charging of particles before their filtration by bag filter; and (3) hybrid electrostatic Precipitator, which uses a conventional electrostatic Precipitator for the removal of coarse particles, and a subsequent bag filter for the removal of fine particles leaving the Precipitator. All of these constructions allow the collection efficiency for PM2.5 particles to be increased and the pressure drop across the bag filter to be reduced. In this paper, various hybrid electrostatic filtration systems have been reviewed and their performances compared with respect to the collection efficiency, pressure drop and dust cake dislodging.
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two stage electrostatic Precipitators for the reduction of pm2 5 particle emission
Progress in Energy and Combustion Science, 2018Co-Authors: Anatol Jaworek, A Marchewicz, A T Sobczyk, Adam Krupa, Th. CzechAbstract:Abstract Electrostatic Precipitator is the most efficient device used for the removal of fly ash particles from the flue gases produced by coal-fired boilers in power plants. However, the fractional collection efficiency of electrostatic Precipitators steeply decreases for particles smaller than 1 μm, and particles in the size range of 200–500 nm are removed with lower collection efficiency than those outside this range. These particles are dangerous to humans and have detrimental environmental effects, so there is a need for novel more efficient technologies for their control. One of the answers to this challenge is the two-stage electrostatic Precipitator, in which the electrostatic charging and precipitation processes have been separated. The PM2.5 particles (of a size
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enhancement of collection efficiency for fly ash particles pm2 5 by unipolar agglomerator in two stage electrostatic Precipitator
Separation and Purification Technology, 2017Co-Authors: A T Sobczyk, ł śliwinski, A Ottawa, A Marchewicz, Thomas Czech, Adam Krupa, Dan Kluk, Anatol Jaworek, Adam CharchalisAbstract:Abstract Semi industrial-scale, two-stage electrostatic precipitation system comprised of unipolar electrostatic agglomerator and electrostatic Precipitator was investigated in this paper. In this type of agglomerator, the process of particle charging and their agglomeration is accomplished in the same device. The particles are charged by ion current in alternating electric field, and agglomerated due to their oscillatory motion in this field, perpendicular to the gas flow. The charged and agglomerated particles are collected in the next stage, which is a conventional electrostatic Precipitator with spiked wire discharge electrodes and collection electrodes of the sigma type. Collection efficiency of this system was measured for different gas temperatures, different fly ash concentrations and for various magnitudes of AC voltage applied to the agglomerator. Two-stage electrostatic Precipitator allows obtaining higher fractional collection efficiency for PM1 and PM2.5 particles than a one-stage electrostatic Precipitator. In this type of two-stage electrostatic Precipitator with an agglomerator, the number collection efficiency for fly ash particles in PM10, PM2.5 and PM1 size ranges was about 96%, 96% and 94%, respectively, and mass collection efficiency in same size ranges was 98%, 97% and 95%, respectively.
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two stage electrostatic Precipitator with co and counter flow particle prechargers
Journal of Electrostatics, 2017Co-Authors: Anatol Jaworek, A Marchewicz, A T Sobczyk, A Krupa, T CzechAbstract:Abstract Lab-scale, two-stage electrostatic precipitation system comprising of precharging stage, in which PM2.5 particles are electrically charged, and collection stage, in which the charged particles are removed from the flowing gas by electric field, was investigated in this paper. Two types of electrostatic particle prechargers were compared with respect to the collection efficiency of the system: (1) co-flow precharger, in which ionic current was generated co-currently with the gas conveying the particles, and (2) counter-flow precharger, in which ionic current was generated oppositely to the flowing gas. In each case, the electrodes of precharger were supplied with DC or AC high-voltage in order to compare the effect of discharge mode on the collection efficiency of two-stage electrostatic Precipitator. The collection stage was formed by two parallel-plate electrodes connected to DC high voltage source. Plate electrodes without discharge points (spikes) are corona-free electrodes, which prevent the collection stage from electrical discharges, and reduce the probability of back discharge ignition. The back discharge decreases collection efficiency of conventional electrostatic Precipitators. It was concluded that the co-flow electrode configuration of the precharger, supplied with DC high voltage, has the highest total number collection efficiency for PM2.5 particles, higher than 95% and the mass collection efficiency larger than 99%. The counter-flow precharger provided only about 90% number collection efficiency of two-stage electrostatic Precipitator. It was also shown that by AC electrode excitation, the collection efficiency of the system is lower than for DC supply. The two-stage electrostatic Precipitators allowed obtaining higher fractional collection efficiency for PM2.5 particles than other conventional systems and can be recommended as highly effective devices for gas cleaning in power plants or cement industry.
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properties of biomass vs coal fly ashes deposited in electrostatic Precipitator
Journal of Electrostatics, 2013Co-Authors: Anatol Jaworek, A T Sobczyk, T Czech, A KrupaAbstract:Abstract This paper presents comparative experimental studies of the morphology and elemental composition of fly ash particles from coal- and biomass-fired boilers, deposited in each stage of 3-stage electrostatic Precipitators (ESPs). It was shown that fly ash morphology, its physical properties, and the percentage of elements in the fly ash taken from each stage of ESP depend on the kind of fuel. The biomass fly ash contains many irregular large particles, which are pieces of unburned wood. Bulk density of biomass fly ash is on average lower than that of coal fly ash, and drastically decreases in the second and third stages of ESP. The resistivity, measured at electric field of 4 kV/cm, of fly ash from biomass-fired boilers is much lower than that from coal, and can be below 102 Ω m, whereas from coal, except the first stage, varies in the range from 107 to 1010 Ω m. The low resistivity of coal fly ash in the first stage of ESP results from high carbon content, and of biomass is probably an effect of additional high percentage of potassium, calcium and sodium sulfates. The percentage of Si, Al, Na, Fe, and Ti in fly ash from coal-fired boilers is much higher than from biomass, and in the opposite, the percentage of Mg, K, Ca, Mn, Mo, S, Cl, and P in biomass ash exceeds that in coal fly ash. Potential detrimental effects of biomass combustion products (salts, acids, tar) leaving the boiler on the construction elements of the electrostatic Precipitator, including electrodes and HV insulators have been discussed in this paper. It was concluded that the long-term effects of biomass co-firing on the electrostatic Precipitator performance, including the collection efficiency, have not been sufficiently studied in the literature and these issues require further detailed investigations.
A T Sobczyk - One of the best experts on this subject based on the ideXlab platform.
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hybrid electrostatic filtration systems for fly ash particles emission control a review
Separation and Purification Technology, 2019Co-Authors: Anatol Jaworek, A Marchewicz, A T Sobczyk, A Krupa, T Czech, L śliwinskiAbstract:Abstract The removal of submicron and nanoparticles from flue gases emitted by coal fired boilers is the subject of extensive studies in recent years. Electrostatic Precipitators and fibrous filters are the most commonly used gas-cleaning devices for the removal of these particles in power plants and industry. However, the collection efficiency of electrostatic Precipitators decreases for particles smaller than 1 µm. Fibrous filters provide higher filtration efficiency for particles of this size, but the pressure drop is higher, and additional energy is needed to supply the outlet fan. Recently, special attention of engineers has been given to hybrid constructions, which apply electrostatic fields and forces in order to improve the performances of bag filters. There are three types of such solutions, which have been investigated in the literature: (1) electrically energized filter, in which fibres of the filter are energized by an electric field; (2) hybrid electrostatic filter, which applies electrostatic charging of particles before their filtration by bag filter; and (3) hybrid electrostatic Precipitator, which uses a conventional electrostatic Precipitator for the removal of coarse particles, and a subsequent bag filter for the removal of fine particles leaving the Precipitator. All of these constructions allow the collection efficiency for PM2.5 particles to be increased and the pressure drop across the bag filter to be reduced. In this paper, various hybrid electrostatic filtration systems have been reviewed and their performances compared with respect to the collection efficiency, pressure drop and dust cake dislodging.
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two stage electrostatic Precipitators for the reduction of pm2 5 particle emission
Progress in Energy and Combustion Science, 2018Co-Authors: Anatol Jaworek, A Marchewicz, A T Sobczyk, Adam Krupa, Th. CzechAbstract:Abstract Electrostatic Precipitator is the most efficient device used for the removal of fly ash particles from the flue gases produced by coal-fired boilers in power plants. However, the fractional collection efficiency of electrostatic Precipitators steeply decreases for particles smaller than 1 μm, and particles in the size range of 200–500 nm are removed with lower collection efficiency than those outside this range. These particles are dangerous to humans and have detrimental environmental effects, so there is a need for novel more efficient technologies for their control. One of the answers to this challenge is the two-stage electrostatic Precipitator, in which the electrostatic charging and precipitation processes have been separated. The PM2.5 particles (of a size
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enhancement of collection efficiency for fly ash particles pm2 5 by unipolar agglomerator in two stage electrostatic Precipitator
Separation and Purification Technology, 2017Co-Authors: A T Sobczyk, ł śliwinski, A Ottawa, A Marchewicz, Thomas Czech, Adam Krupa, Dan Kluk, Anatol Jaworek, Adam CharchalisAbstract:Abstract Semi industrial-scale, two-stage electrostatic precipitation system comprised of unipolar electrostatic agglomerator and electrostatic Precipitator was investigated in this paper. In this type of agglomerator, the process of particle charging and their agglomeration is accomplished in the same device. The particles are charged by ion current in alternating electric field, and agglomerated due to their oscillatory motion in this field, perpendicular to the gas flow. The charged and agglomerated particles are collected in the next stage, which is a conventional electrostatic Precipitator with spiked wire discharge electrodes and collection electrodes of the sigma type. Collection efficiency of this system was measured for different gas temperatures, different fly ash concentrations and for various magnitudes of AC voltage applied to the agglomerator. Two-stage electrostatic Precipitator allows obtaining higher fractional collection efficiency for PM1 and PM2.5 particles than a one-stage electrostatic Precipitator. In this type of two-stage electrostatic Precipitator with an agglomerator, the number collection efficiency for fly ash particles in PM10, PM2.5 and PM1 size ranges was about 96%, 96% and 94%, respectively, and mass collection efficiency in same size ranges was 98%, 97% and 95%, respectively.
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two stage electrostatic Precipitator with co and counter flow particle prechargers
Journal of Electrostatics, 2017Co-Authors: Anatol Jaworek, A Marchewicz, A T Sobczyk, A Krupa, T CzechAbstract:Abstract Lab-scale, two-stage electrostatic precipitation system comprising of precharging stage, in which PM2.5 particles are electrically charged, and collection stage, in which the charged particles are removed from the flowing gas by electric field, was investigated in this paper. Two types of electrostatic particle prechargers were compared with respect to the collection efficiency of the system: (1) co-flow precharger, in which ionic current was generated co-currently with the gas conveying the particles, and (2) counter-flow precharger, in which ionic current was generated oppositely to the flowing gas. In each case, the electrodes of precharger were supplied with DC or AC high-voltage in order to compare the effect of discharge mode on the collection efficiency of two-stage electrostatic Precipitator. The collection stage was formed by two parallel-plate electrodes connected to DC high voltage source. Plate electrodes without discharge points (spikes) are corona-free electrodes, which prevent the collection stage from electrical discharges, and reduce the probability of back discharge ignition. The back discharge decreases collection efficiency of conventional electrostatic Precipitators. It was concluded that the co-flow electrode configuration of the precharger, supplied with DC high voltage, has the highest total number collection efficiency for PM2.5 particles, higher than 95% and the mass collection efficiency larger than 99%. The counter-flow precharger provided only about 90% number collection efficiency of two-stage electrostatic Precipitator. It was also shown that by AC electrode excitation, the collection efficiency of the system is lower than for DC supply. The two-stage electrostatic Precipitators allowed obtaining higher fractional collection efficiency for PM2.5 particles than other conventional systems and can be recommended as highly effective devices for gas cleaning in power plants or cement industry.
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properties of biomass vs coal fly ashes deposited in electrostatic Precipitator
Journal of Electrostatics, 2013Co-Authors: Anatol Jaworek, A T Sobczyk, T Czech, A KrupaAbstract:Abstract This paper presents comparative experimental studies of the morphology and elemental composition of fly ash particles from coal- and biomass-fired boilers, deposited in each stage of 3-stage electrostatic Precipitators (ESPs). It was shown that fly ash morphology, its physical properties, and the percentage of elements in the fly ash taken from each stage of ESP depend on the kind of fuel. The biomass fly ash contains many irregular large particles, which are pieces of unburned wood. Bulk density of biomass fly ash is on average lower than that of coal fly ash, and drastically decreases in the second and third stages of ESP. The resistivity, measured at electric field of 4 kV/cm, of fly ash from biomass-fired boilers is much lower than that from coal, and can be below 102 Ω m, whereas from coal, except the first stage, varies in the range from 107 to 1010 Ω m. The low resistivity of coal fly ash in the first stage of ESP results from high carbon content, and of biomass is probably an effect of additional high percentage of potassium, calcium and sodium sulfates. The percentage of Si, Al, Na, Fe, and Ti in fly ash from coal-fired boilers is much higher than from biomass, and in the opposite, the percentage of Mg, K, Ca, Mn, Mo, S, Cl, and P in biomass ash exceeds that in coal fly ash. Potential detrimental effects of biomass combustion products (salts, acids, tar) leaving the boiler on the construction elements of the electrostatic Precipitator, including electrodes and HV insulators have been discussed in this paper. It was concluded that the long-term effects of biomass co-firing on the electrostatic Precipitator performance, including the collection efficiency, have not been sufficiently studied in the literature and these issues require further detailed investigations.
A Marchewicz - One of the best experts on this subject based on the ideXlab platform.
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hybrid electrostatic filtration systems for fly ash particles emission control a review
Separation and Purification Technology, 2019Co-Authors: Anatol Jaworek, A Marchewicz, A T Sobczyk, A Krupa, T Czech, L śliwinskiAbstract:Abstract The removal of submicron and nanoparticles from flue gases emitted by coal fired boilers is the subject of extensive studies in recent years. Electrostatic Precipitators and fibrous filters are the most commonly used gas-cleaning devices for the removal of these particles in power plants and industry. However, the collection efficiency of electrostatic Precipitators decreases for particles smaller than 1 µm. Fibrous filters provide higher filtration efficiency for particles of this size, but the pressure drop is higher, and additional energy is needed to supply the outlet fan. Recently, special attention of engineers has been given to hybrid constructions, which apply electrostatic fields and forces in order to improve the performances of bag filters. There are three types of such solutions, which have been investigated in the literature: (1) electrically energized filter, in which fibres of the filter are energized by an electric field; (2) hybrid electrostatic filter, which applies electrostatic charging of particles before their filtration by bag filter; and (3) hybrid electrostatic Precipitator, which uses a conventional electrostatic Precipitator for the removal of coarse particles, and a subsequent bag filter for the removal of fine particles leaving the Precipitator. All of these constructions allow the collection efficiency for PM2.5 particles to be increased and the pressure drop across the bag filter to be reduced. In this paper, various hybrid electrostatic filtration systems have been reviewed and their performances compared with respect to the collection efficiency, pressure drop and dust cake dislodging.
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two stage electrostatic Precipitators for the reduction of pm2 5 particle emission
Progress in Energy and Combustion Science, 2018Co-Authors: Anatol Jaworek, A Marchewicz, A T Sobczyk, Adam Krupa, Th. CzechAbstract:Abstract Electrostatic Precipitator is the most efficient device used for the removal of fly ash particles from the flue gases produced by coal-fired boilers in power plants. However, the fractional collection efficiency of electrostatic Precipitators steeply decreases for particles smaller than 1 μm, and particles in the size range of 200–500 nm are removed with lower collection efficiency than those outside this range. These particles are dangerous to humans and have detrimental environmental effects, so there is a need for novel more efficient technologies for their control. One of the answers to this challenge is the two-stage electrostatic Precipitator, in which the electrostatic charging and precipitation processes have been separated. The PM2.5 particles (of a size
-
enhancement of collection efficiency for fly ash particles pm2 5 by unipolar agglomerator in two stage electrostatic Precipitator
Separation and Purification Technology, 2017Co-Authors: A T Sobczyk, ł śliwinski, A Ottawa, A Marchewicz, Thomas Czech, Adam Krupa, Dan Kluk, Anatol Jaworek, Adam CharchalisAbstract:Abstract Semi industrial-scale, two-stage electrostatic precipitation system comprised of unipolar electrostatic agglomerator and electrostatic Precipitator was investigated in this paper. In this type of agglomerator, the process of particle charging and their agglomeration is accomplished in the same device. The particles are charged by ion current in alternating electric field, and agglomerated due to their oscillatory motion in this field, perpendicular to the gas flow. The charged and agglomerated particles are collected in the next stage, which is a conventional electrostatic Precipitator with spiked wire discharge electrodes and collection electrodes of the sigma type. Collection efficiency of this system was measured for different gas temperatures, different fly ash concentrations and for various magnitudes of AC voltage applied to the agglomerator. Two-stage electrostatic Precipitator allows obtaining higher fractional collection efficiency for PM1 and PM2.5 particles than a one-stage electrostatic Precipitator. In this type of two-stage electrostatic Precipitator with an agglomerator, the number collection efficiency for fly ash particles in PM10, PM2.5 and PM1 size ranges was about 96%, 96% and 94%, respectively, and mass collection efficiency in same size ranges was 98%, 97% and 95%, respectively.
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two stage electrostatic Precipitator with co and counter flow particle prechargers
Journal of Electrostatics, 2017Co-Authors: Anatol Jaworek, A Marchewicz, A T Sobczyk, A Krupa, T CzechAbstract:Abstract Lab-scale, two-stage electrostatic precipitation system comprising of precharging stage, in which PM2.5 particles are electrically charged, and collection stage, in which the charged particles are removed from the flowing gas by electric field, was investigated in this paper. Two types of electrostatic particle prechargers were compared with respect to the collection efficiency of the system: (1) co-flow precharger, in which ionic current was generated co-currently with the gas conveying the particles, and (2) counter-flow precharger, in which ionic current was generated oppositely to the flowing gas. In each case, the electrodes of precharger were supplied with DC or AC high-voltage in order to compare the effect of discharge mode on the collection efficiency of two-stage electrostatic Precipitator. The collection stage was formed by two parallel-plate electrodes connected to DC high voltage source. Plate electrodes without discharge points (spikes) are corona-free electrodes, which prevent the collection stage from electrical discharges, and reduce the probability of back discharge ignition. The back discharge decreases collection efficiency of conventional electrostatic Precipitators. It was concluded that the co-flow electrode configuration of the precharger, supplied with DC high voltage, has the highest total number collection efficiency for PM2.5 particles, higher than 95% and the mass collection efficiency larger than 99%. The counter-flow precharger provided only about 90% number collection efficiency of two-stage electrostatic Precipitator. It was also shown that by AC electrode excitation, the collection efficiency of the system is lower than for DC supply. The two-stage electrostatic Precipitators allowed obtaining higher fractional collection efficiency for PM2.5 particles than other conventional systems and can be recommended as highly effective devices for gas cleaning in power plants or cement industry.
Adam Charchalis - One of the best experts on this subject based on the ideXlab platform.
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enhancement of collection efficiency for fly ash particles pm2 5 by unipolar agglomerator in two stage electrostatic Precipitator
Separation and Purification Technology, 2017Co-Authors: A T Sobczyk, ł śliwinski, A Ottawa, A Marchewicz, Thomas Czech, Adam Krupa, Dan Kluk, Anatol Jaworek, Adam CharchalisAbstract:Abstract Semi industrial-scale, two-stage electrostatic precipitation system comprised of unipolar electrostatic agglomerator and electrostatic Precipitator was investigated in this paper. In this type of agglomerator, the process of particle charging and their agglomeration is accomplished in the same device. The particles are charged by ion current in alternating electric field, and agglomerated due to their oscillatory motion in this field, perpendicular to the gas flow. The charged and agglomerated particles are collected in the next stage, which is a conventional electrostatic Precipitator with spiked wire discharge electrodes and collection electrodes of the sigma type. Collection efficiency of this system was measured for different gas temperatures, different fly ash concentrations and for various magnitudes of AC voltage applied to the agglomerator. Two-stage electrostatic Precipitator allows obtaining higher fractional collection efficiency for PM1 and PM2.5 particles than a one-stage electrostatic Precipitator. In this type of two-stage electrostatic Precipitator with an agglomerator, the number collection efficiency for fly ash particles in PM10, PM2.5 and PM1 size ranges was about 96%, 96% and 94%, respectively, and mass collection efficiency in same size ranges was 98%, 97% and 95%, respectively.
Adam Krupa - One of the best experts on this subject based on the ideXlab platform.
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two stage electrostatic Precipitators for the reduction of pm2 5 particle emission
Progress in Energy and Combustion Science, 2018Co-Authors: Anatol Jaworek, A Marchewicz, A T Sobczyk, Adam Krupa, Th. CzechAbstract:Abstract Electrostatic Precipitator is the most efficient device used for the removal of fly ash particles from the flue gases produced by coal-fired boilers in power plants. However, the fractional collection efficiency of electrostatic Precipitators steeply decreases for particles smaller than 1 μm, and particles in the size range of 200–500 nm are removed with lower collection efficiency than those outside this range. These particles are dangerous to humans and have detrimental environmental effects, so there is a need for novel more efficient technologies for their control. One of the answers to this challenge is the two-stage electrostatic Precipitator, in which the electrostatic charging and precipitation processes have been separated. The PM2.5 particles (of a size
-
enhancement of collection efficiency for fly ash particles pm2 5 by unipolar agglomerator in two stage electrostatic Precipitator
Separation and Purification Technology, 2017Co-Authors: A T Sobczyk, ł śliwinski, A Ottawa, A Marchewicz, Thomas Czech, Adam Krupa, Dan Kluk, Anatol Jaworek, Adam CharchalisAbstract:Abstract Semi industrial-scale, two-stage electrostatic precipitation system comprised of unipolar electrostatic agglomerator and electrostatic Precipitator was investigated in this paper. In this type of agglomerator, the process of particle charging and their agglomeration is accomplished in the same device. The particles are charged by ion current in alternating electric field, and agglomerated due to their oscillatory motion in this field, perpendicular to the gas flow. The charged and agglomerated particles are collected in the next stage, which is a conventional electrostatic Precipitator with spiked wire discharge electrodes and collection electrodes of the sigma type. Collection efficiency of this system was measured for different gas temperatures, different fly ash concentrations and for various magnitudes of AC voltage applied to the agglomerator. Two-stage electrostatic Precipitator allows obtaining higher fractional collection efficiency for PM1 and PM2.5 particles than a one-stage electrostatic Precipitator. In this type of two-stage electrostatic Precipitator with an agglomerator, the number collection efficiency for fly ash particles in PM10, PM2.5 and PM1 size ranges was about 96%, 96% and 94%, respectively, and mass collection efficiency in same size ranges was 98%, 97% and 95%, respectively.
