FILTRATION CHARACTERISTICS OF A MINIATURE ELECTROSTATIC PRECIPITATOR
Resource
AEROSOL SCIENCE AND TECHNOLOGY v.35 n.4 pp.792-804
Journal
AEROSOL SCIENCE AND TECHNOLOGY
Journal Volume
v.35
Journal Issue
n.4
Pages
792-804
Date Issued
2001
Date
2001
Author(s)
HUANG, SHENG-HSIU
Abstract
This study investigates the filtration characteristics of a
miniature dual saw-like electrodes electrostatic
precipitator (ESP). Parameters such as particle size, rate
of airflow through the ESP, voltage of charge electrode, and
discharge polarity were considered to study their influence
on aerosol penetration through the ESP. Polydisperse and
monodisperse particles with sizes ranging from 30 nm to 10
mum were used as the challenge aerosols. Experimental
results indicated that the aerosol penetration through the
ESP decreased (from 96% to 15% for 0.3 mum) as the voltage
of the discharge electrode increased (from +4 kV to +8 kV)
at a flow rate of 30 L/min. At a fixed electrode voltage (+8
kV), aerosol penetration increased from 15% to 69% for 0.3
pm particles as the flow rate increased from 30 to 120 L/min
. The most penetrating particle size was in the range of 0.
25 mum to 0.5 mum depending on the discharge voltage and the
flow rate. In general, the most penetrating particle size
of the ESP decreased with decreasing discharge voltage or
with increasing flow rate. At the same voltage level but
opposite polarity, the aerosol penetration through the ESP
with negative corona was lower than that with positive
corona. The difference in aerosol penetration was a factor
of about 2 between the negative and positive coronas for 0.3
pm particles, and this difference was found to be
independent of discharge voltage. Regarding energy
conservation, use of a negative-polarity ESP was more
economical if the same efficiency was required. However, the
ozone generated by the ESP with negative polarity was about
five times greater than that generated with positive
polarity. Therefore when using an ESP as an indoor air
cleaner, the search for an optimum balance between ozone
production and aerosol collection efficiency should be
considered.
Subjects
FLY-ASH
OZONE
PERFORMANCE
Type
journal article