Workplace extraction, column-scrubber, dry dust removal, wet dust removal, thermal oxidation with regenerative heat recovery (RTO) for prototype casting house

Posing the tasks

All exhaust air flows from a newly erected automobile factory, prototype casting house must be individually cleaned as per the respective contaminant composition. Due to space restrictions, the entire system was installed on the roof of the casting house at approx. 16 m height.

Solution / Highlights

LTB received acceptance of its tender because all the necessary the exhaust air purification processes and the corresponding in-house know-how would be offered by one provider. The scope of delivery also encompassed the complete piping from the emission points up to the chimney.

A separate steel structure was erected in order to be able to install the system on the roof. The total of five exhaust air ventilators were installed together in a sound suppression booth for noise protection purposes.

For cleaning the exhaust air from the casting core production, an acid washing column is deployed to separate the emitted amines and to convert these to the respective salt. During filling of the liquid casting mass into the sand forms, the bonding media used escapes in the form of low temperature carbonization gasses. These are cleaned through a thermal oxidation process with regenerative heat recovery. The dusts ensuing during demoulding are held down through a hose filter with compressed air cleaning. In order exclude fire hazards due to aluminium alloy dusts, exhaust air from the fettling shop is wet-separated by means of a rotation washer.