Electrical similarity concerning particle transport in electrostatic precipitators

Riehle, Claus; Löffler, Friedrich

doi:10.1016/0304-3886(93)90102-d

Cited by 12 publications

(7 citation statements)

References 15 publications

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“…Figure 4 shows the current-voltage curves for the three ESPs, which are well within the expected range (Oglesby & Nichols, 1978;Cooperman, 1981). According to Riehle and Lö ffler (1993), the current and the voltage, when presented in a dimensionless form, j 0 and U 0 , respectively, are suitable parameters for scaling similarity. They are defined as follows:…”

Section: Methodsmentioning

confidence: 93%

“…The values of these parameters are presented in Table 2. Their orders of magnitude were as suggested by Riehle and Lö ffler (1993). After that, the run started with the feeding of the particulate matter, which was dispersed in the gas stream by a rotating plate feeder.…”

Section: Methodsmentioning

confidence: 99%

“…Nevertheless, the amount of experimental data available in scaling is scarce (Riehle & Lö ffler, 1993).…”

Section: Introductionmentioning

confidence: 99%

“…All symbols and variables are explained in the Nomenclature section. The first three parameters were suggested by Riehle and Lö ffler (1993) and are based on the electrical similarity within the ESP. The fourth was formulated by considering the energy balance.…”

Section: Introductionmentioning

confidence: 99%

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Scaleup Investigation of a Wire-Plate Geometry Electrostatic Precipitator

Falaguasta

Coury

Nóbrega

2006

Particulate Science and Technology

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Experimental tests were carried out in three geometrically similar laboratory-scale wire-plate electrostatic precipitators in order to evaluate the best electric parameter for scaling the equipment. The parameters kept constant were the pseudo-homogeneous electric field, E p , the current density, j, the dimensionless voltage, U 0 , and the power consumption per unit collection area, P A . The experimental tests consisted in measuring the overall efficiency of particle removal, which was used as the comparison parameter. The results indicated that, for constant U 0 , efficiency increased with precipitator size. As for the parameters E p and P A , the data were scattered and showed no clear tendency. Finally, by keeping j constant, the overall efficiency of the precipitator remained constant (within AE 5%), regardless of the precipitator size. Precipitator efficiency increased exponentially with increase in power consumption per unit gas volume, and all data were well fitted to a power law correlation.

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Section: Methodsmentioning

confidence: 93%

Section: Methodsmentioning

confidence: 99%

“…Nevertheless, the amount of experimental data available in scaling is scarce (Riehle & Lö ffler, 1993).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Scaleup Investigation of a Wire-Plate Geometry Electrostatic Precipitator

Falaguasta

Coury

Nóbrega

2006

Particulate Science and Technology

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“…A collecting electrode plate spacing of 200 mm is a value often used for laboratory scaled precipitators. Although in commercial EP×s usually larger widths are applied (up to 400 mm) Riehle and Lˆffler [13] have shown, that a scale-up of geometrical similar precipitators is possible if additionally the dimensionless applied voltage is kept constant. Consequently, results of laboratory scaled EP×s can be transferred to wide-spaced commercially used EP×s.…”

Section: Model Precipitatormentioning

confidence: 99%

In-Situ Measurement of Local Particle Flux Densities in a Complex Two-Phase Flow

Schmid

Veith

Umhauer³

2002

Part. Part. Syst. Charact.

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Particle Dynamics in an Electrohydrodynamic Flow Field investigated with a two‐component laser‐doppler velocimeter

Riehle

Löffler

1993

Part & Part Syst Charact

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A laser-Doppler instrument has been used to measure the migration velocity of NaCl particles in an electrohydrodynamic flow field of an electrical precipitator. The measured average migration velocity of 1.40-pm particles (number distribution median with a geometric standard devitation of 1.46) is approximately five to six times higher than the calculated steady-state velocity for a 1.40-pm particle, provided there is a saturation charge of at least 90%. Further, the particle velocities in the main flow direction are also influenced by the electrical operation conditions. Both observations demonstrate the important role of the state of the electrohydrodynamic flow field (superposition of moving gas ions and neutral gas molecules) on the particle transport, characterizied by the dimensionless electrohydrodynamic number N,,,. A comparison between six different electrohydrodynamic states revealed that N,,, = 1 is a critical value for the mutual interactions between the gas ions and the neutral gas phase. Whereas for NEHD values >1 the stochastic particle motion is chiefly determined by the nonsteady-state character of the negative corona, for N,,, values < 1 the particle velocity fluctuations are governed by the turbulence level of the neutral fluid. These findings might be helpful in adjusting the operating conditions in electrical precipitators for an optimized particle separation.

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Electrical similarity concerning particle transport in electrostatic precipitators

Cited by 12 publications

References 15 publications

Scaleup Investigation of a Wire-Plate Geometry Electrostatic Precipitator

Scaleup Investigation of a Wire-Plate Geometry Electrostatic Precipitator

In-Situ Measurement of Local Particle Flux Densities in a Complex Two-Phase Flow

Particle Dynamics in an Electrohydrodynamic Flow Field investigated with a two‐component laser‐doppler velocimeter

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