Principle of Dust Monitor in Flue Gas Online Monitoring System

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Enviro Solutions Technology
PRINCIPLE OF DUST MONITOR IN FLUE GAS ONLINE
MONITORING SYSTEM
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HOW DOES THE DUST MONITOR WORK?
1) Principle of light scattering
When light shines on suspended particles in the
air, scattered light is produced, and the
intensity of the scattered light is proportional
to the mass concentration of the particles. By
measuring the intensity of scattered light and
applying the mass concentration conversion
formula, multiplying it by the K factor, and
performing digital signal processing.
2) Principle of ß-ray method
Beta rays are a type of ionizing radiation
released by charged particles during their
motion. Beta rays have low energy and can
penetrate certain materials. When beta rays pass
through a medium containing particulate matter,
they will interact with the particulate matter
and scatter or absorb the particulate matter,
resulting in energy loss.
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3) PRINCIPLE OF DUST SENSOR GRAVIMETRIC METHOD
The principle of the gravimetric method is to use
a sampler with specific cutting characteristics
to extract a certain volume of air sample at a
constant speed and trap the particles in the
sample gas on a filter membrane of known mass. By
comparing the mass difference of the filter
membrane before and after sampling and the
sampling volume, the dust concentration can be
calculated. It should be noted that when
measuring particle concentration, the denominator
volume in the unit ug/m3 should be the volume
under standard conditions (0C, 101.3kPa).
Therefore, the actual measured volume at
temperature and pressure needs to be converted
into the volume under standard conditions.
4) PRINCIPLE OF OSCILLATING BALANCE METHOD
The micro-oscillating balance method uses an
oscillating hollow conical tube inside the
sensor, and a replaceable filter membrane is
installed at the oscillating end. The oscillating
frequency depends on the characteristics of the
conical tube and its quality. When the sampled
air flows through the filter membrane, the
particles in it are deposited on the filter
membrane. The change in the quality of the filter
membrane leads to a change in the oscillation
frequency.
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THE TYPES OF DUST MONITOR
Fixed dust monitor
Fixed dust meters are usually installed in fixed
locations in flue gas emission ducts or
industrial sites for continuous, real-time dust
monitoring.
Portable dust monitor
Portable dust meters are suitable for on-site
detection and environmental surveys. They are
small in size, light in weight, and easy to
carry.
Personal Dust Monitor
Personal dust meters are designed for personal
protection and monitor the concentration of
particulate matter in the air around the wearer.
It is smaller in size and is usually worn on the
chest or waist.
Online dust monitor
The online dust meter is installed on the
pipeline of industrial emission sources and is
suitable for continuous online monitoring.
Special dust monitor
Special dust meters are designed for specific
environments or specific dust types, and usually
have higher pertinence and measurement accuracy.
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Enviro Solutions Technology
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