DioxinMonitoringSystem®

Complete Surveillance of Dioxin Emissions

Sampling Method

 

The DioxinMonitoringSystem® uses the dilution method of the standard EN 1948-1 standard. Many advantages underline the versatile use of this method.

 

Dry sampling

The dilution method used in our device avoids condensation, whereas the cooled probe method and the filter/condenser method condense the humidity inside the filter/adsorber. Refering to EN 1948-1, this condensate has to be collected and transferred completely to the laboratory. e.g. sampling of 1 m3/hour at 20% humidity produce 4 liters of condensate in 1 day, 28 liters in 1 week and consequently 108 liters in one month. The dilution method condenses no humidity. Therefore a dry cartridge is transferred to the laboratory.

 

Complete sampling of the dust fraction

The EN 1948-1 standard requires the precipitation of the fine dust fraction with better than 99,5% as a minimum requirement. The dilution method uses a dry filter at 40°C temperature, precipitating all dust particles. The fine dust fraction < 2,5 µm is precipitated with very high efficiency.

 

New investigations in Germany have shown, that in modern municipal waste incineration plants the portion of the fine dust fraction is higher than 60%. Other long term sampling devices for dioxins use wet wool for dust precipitation, which is not sufficient, because fine dust can pass the cartridge, precipitated dust can be solved only and washed through the cartridges.

 

Low sampling temperature

In flue gas, dioxins are adsorbed to activated carbon and fine dust particles and evaporated in the gas phase. By cooling the flue gas with dilution air, a high portion of the gaseous dioxins are adsorbed by the particles, thus, most of the dioxins are precipitated on the dust filter at the temperature of 40°C. At this low temperature, no further reactions (losses) or denovo synthesis (formation) are possible.

 
Two measurement positions compared to traversing

EN 1948-1 requires representative sampling. For highest accuracy, traversing shall be done according EN 13284-1, using 4, 9 or 16 positions in the stack. EN 1948-1 allows the use of two measurement positions instead of traversing. In this case (two positions instead of traversing) the measurement uncertainty has to be increased by 10% (part 3, Annex B.3).

 

The dilution method is a complex method, which needs many adjustments during measurement. The DioxinMonitoringSystem® provides these adjustments automatically - accurate I-TEQ values are the result.


MonitoringSystems®  GmbH, 3021 Pressbaum, Austria

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