Characterization of the emission behavior of pulse-jet cleaned filters using a low-cost particulate matter sensor = Charakterisierung der Emission von druckstoßgereinigten Oberflächenfiltern mit einem Low-Cost-Feinstaubsensor

The reduction of fine dust emissions with pulse-
jet cleaned filters plays an important role in industrial gas
cleaning to meet emission standards and protect the environ-
ment. The dust emission of technical facilities is typically
meas ured “end of pipe”, so that no information about the local
emission contribution of individual filter elements exists.
Cheap and compact low-cost sensors for the detection of parti-
culate matter (PM) concentrations, which have been promi-
nently applied for immission monitoring in recent years have
the potential for emission measurement of filters to improve
process monitoring. This publication discusses the suitability
of a low-cost PM-sensor, the model SPS30 from the manu-
facturer Sensirion, in terms of the potential for particle emissi-
on measurement of surface filters in a filter test rig based on
DIN ISO 11057. A Promo® 2000 in combination with a Welas®
2100 sensor serves as the optical reference device for the eva-
luation of the detected PM$_{2.5}$ concentration and particle size
distribution of the emission measured by the low-cost sensor.
The Sensirion sensor shows qualitatively similar results of the
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detected PM$_{2.5}$ emission as the low-cost sensor SDS011 from
the manufacturer Nova Fitness, which was investigated by
Schwarz et al. in a former study. The typical emission peak af-
ter jet-pulse cleaning of the filter, due to the penetration of par-
ticles through the filter medium, is detected during Δp-control-
led operation. The particle size distribution calculated from the
size resolved number concentrations of the low-cost sensor
yields a distinct distribution for three different employed filter
media and qualitatively fits the size distribution detected by
the Palas® reference. The emission of these three different
types of filter media can be distinguished clearly by the meas -
ured PM$_{2.5}$ concentration and the emitted mass per cycle and
filter area, demonstrating the potential for PM emission moni-
toring by the low-cost PM-sensor. During the period of Δt-con-
trolled filter aging, a decreasing emission, caused by an in-
creasing amount of stored particles in the filter medium, is
detected. Due to the reduced particle emission after filter
aging, the specified maximum concentration of the low-cost
sensor is not exceeded so that coincidence is unlikely to affect
the measurement results of the sensor for all but the very first
stage of filter life.