Abstract Submission - B. Torralba - CTIF (Centre Technique des Industries de la Fonderie)
Measurements of diffuse gas emissions in foundries using a DOAS technique - Comparison with "Roof monitor" method
General
Diffuse gas emissions in foundry (VOCs, NOx, SO2, amines….) are generated essentially during sand mould casting and hard to measure. Usually the method used to characterize them is the “Roof Monitor” method which is suitable to give accurate emission rates for all the roof openings of the foundry hall. The difficulty is to choose the representative sampling period and to evaluate all the openings which are often large and numerous with difficult access and hard conditions to work around.
CTIF had developed together with INERIS a method in order to do continuous measurement of diffuse gas emissions without access constraints. They use DOAS (Differential Optical Absorption Spectroscopy) technology which is able to relate the quantity of light absorbed to the number of gas molecules in the light path and measure a number of different pollutants along a single light beam.
Contents of presentation:
This presentation should give an overview of the interest of the DOAS technique to estimate concentrations and emission rates but also to follow the foundry process :
- Presentation of the foundry and the diffuse emissions sources.
- Campaign presentation in October 2007 during 14 days (on the roof and in the hall).
- Correlation analysis of the high volume of data from DOAS and production data.
- Comparison between continuous and average data from the Roof monitor and DOAS approaches.
- Difficulties met to measure diffuse air flow and calculate emissions rates.
