French WWTP are using PCME VIEW 370 for sludge dryer particulate monitoring
The amount of dust produced in the dryer and later processing plant is affected by the type of dryer installed. As sewage sludge dust has a similar range of figures to wood flour, there is the potential for a dust explosion to occur in the main dryer, dust collection and handling plant, pelletiser and final product discharge plant. The material can also self heat leading to ignition and a slow burn which may be accelerated with the ingress of additional air into the plant. Explosions and fires in dryers and associated processing plant have occurred in the past.
As measuring contionuously and accurately particulates into the drying process reaveals to be crucial to avoid dust cloud explosions in WWTP, Environnement S.A suggested the use of the PCME VIEW 370 dust monitor.
Since minimum Explosible Concentrations (MEC) for sludge being measured as low as 60g/m3, which is a typical value for many dusts, the PCME VIEW 370 with measurement capability from 0-10mg/m3 to 0–500mg/m3 (automatic range changes), represents the perfect solution for all Waste Water Treatment Plants applications.
Calibration for mg/m3 via an Iso-kinetic sample is simplified via data stored in the in-built short term logger. Unlike other dust monitors, the instrument is then internally calibrated with all data, outputs and results calibrated and scaled directly in mg/m3.
The instrument uses PCME’s unique and patented ElectroDynamic Probe Electrification technology. The sensor electronics measures the current signature created by particles interacting with the grounded sensing rod which protrudes into the stack. The electronics extract a specific frequency band of this signal and electronically filters out the dc current caused by particle collisions. This signal may be correlated to dust concentration by comparison to the results of an iso-kinetic sample for those types of industrial stack applications for which the instrument is designed (see application conditions).
- Unaffected by contamination on the sensor rod (which may causesignal drift issues for other systems).
- Not affected by velocity variations within typical bagfilter velocity ranges (see separate TUV approvals for PCME Ltd technology).
- Reliable and stable in the target applications for the instrument (see Process conditions). Identical PCME technology to this is used in TUV and MCERTs approved instruments.
Benefits of the technology:
- Tolerance to contamination on the rod
- Stable results and calibrations (protected probes are not necessary in dry applications and therefore drift caused by electrostatic charging effects is avoided)
- Reduced sensitivity to the effects of changing velocity
Compared to other types of AC systems,ElectroDynamic Systems have the following added benefit:
- An optimised frequency spectrum to extend the velocity range over which the system has no cross sensitivity to changing velocity (see TUV approvals).
Compared to DC triboelectric systems and ‘induction sensing and protected probe systems’, ElectroDynamic systems have the following added benefits:
- Tolerance to contamination on the rod
- Stable results and calibrations (protected probes are not necessary in dry applications and therefore drift caused by electrostatic charging effects is avoided)
- Reduced sensitivity to the effects of changing velocity
For further information on this equipment : http://www.pcme.com/product/pcme-view-370
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