Besides being the only system totally certified on the market, the QAL 181 WS dust monitor is suitable for measuring particulate emissions from wet scrubbers (alkaline scrubbers) and other processes where the flue gas falls below dew point (cold stack conditions) or water droplets are present.
In 2015, one of the biggest European Pulp and Paper Company with facilities in France, launched a comparative study for the renewal of its dust emissions monitors installed on its production sites. The operator did not only required to meet the regulatory requirements but was looking for a turnkey system, using the most reliable technology, the most economical and the most adapted solution to its very dusty and humid process. His choice was naturally inclined towards the QAL 181 WS particulate analyzer, manufactured by PCME Ltd (British subsidiary of Environnement SA), for which reliability and reduced maintenance operations were the key objectives of the development of the most comprehensive Certified dust analyzers range in the world.
Besides being the only system totally certified on the market, the QAL 181 WS dust monitor is suitable for measuring particulate emissions from wet scrubbers (alkaline scrubbers) and other processes where the flue gas falls below dew point (cold stack conditions) or water droplets are present. The system uses an advanced ProScatter™ light scatter sensor (PCME QAL 181) which itself is certified by TUV certified to EN 15267-3 with QAL 1 as defined by EN 14181 with a certification range of 0 – 15 mg/m3. The system will operate reliably in the flue gas conditions found after wet FGD and wet collectors in the Pulp and Paper, Metal and Chemicals industry where particulate levels are higher and the instrument is able to cope with potentially more contaminating conditions.
Typical wet stack applications:
- Applications requiring QAL1 approved systems for wet stack monitoring
- For applications with corrosive flue gas (e.g. wet FGD plant) an enhanced corrosion resistant version is available
- Waste Incineration plant with wet scrubbing abatement plant and WESPs
- Pulp and Paper Recovery boilers
- Metallurgical and chemical processes fitted with wet scrubbers…
The extractive instrument QAL 181 WS takes a representative continuous sample from the stack, heats this well above dew point to evaporate water droplets and then measures the particulate concentration under dry conditions. This extractive approach with heating overcomes the problems of interference from condensation and water droplets associated with using in-situ particulate monitors after wet collectors.