Abstract
The multipoint-to-plane electrostatic precipitator (ESP) is one type of ESP devices used for the sampling and control of nanoparticles and sub-micron particles, with the advantage of a low pressure drop and high particle collection efficiency. Several empirical equations for predicting the particle collection efficiency are available in the literature, but most of them are only applicable to wire-in-plate ESPs. For ESPs with different discharge electrodes, the empirical equations are different since the ion concentration and electric fields are different. In this paper, a predictive method is developed to calculate the particle migration velocity and the particle collection efficiency equation η(%) of multipoint-to-plane ESPs in the form of η(%) = {1 – exp{–[β1(NDeβ2) + β3(NDe) + β4]}} × 100%, in which β1, β2, β3 and β4 are regression coefficients and NDe is the Deutsch number determined by the particle migration velocity. Good agreement is obtained between the present model predictions and the experimental particle collection efficiencies obtained from the literature. It is expected that the present model can be used to facilitate the design of efficient multipoint-to-plane ESPs for nanoparticle and sub-micron particles removal in the future.
Highlights
Because of low pressure drop and high particle collection efficiency, electrostatic precipitators (ESPs) are widely used in the industry to remove particles suspended in the exhaust gas (Ruttanachot et al, 2011), in which the wire-to-plate ESP is the most commonly used
Several empirical equations for predicting the particle collection efficiency are available in the literature, but most of them are only applicable to wire-in-plate ESPs
The deviation of the predicted total ion current from the experimental data is less than ± 20% when the negative ion mobility value of 2.3 × 10–4 m2/V-s suggested by Adamiak and Atten (2004) is used (Fig. 4(a)), and is less than ± 21% when the positive ion mobility value of 1.4 × 10–4 m2/V-s suggested by Lin and Tsai (2010) is used (Fig. 4(b))
Summary
Because of low pressure drop and high particle collection efficiency, electrostatic precipitators (ESPs) are widely used in the industry to remove particles suspended in the exhaust gas (Ruttanachot et al, 2011), in which the wire-to-plate ESP is the most commonly used. When a high voltage is applied to the point electrode in the multipoint-to-plane ESP, ionization, attachment and recombination between air ions and particles occur in a thin layer around the tip of the electrode, which is called the ionization region. The tips of the point discharge electrodes generate higher electric filed and current density than those in the wire-to-plate ESP, which lead to higher particle collection efficiency (Lin et al, 2012b)
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