Case Study:
High emissions due to several issues was solved by pleated bags
Location:
- UNITED KINGDOM
Operation:
Removal of slag after casting process and general ventilation of casting fumes
Dust type:
Manganese, foundry ferrous fume and nickel
Problem:
Bad baffling in two dust collectors caused swinging of the 4 meter long filterbags. This resulted in holes in bags and thereby high emissions (higher than the 20mg/m3 set out by public authorities).
Solution:
- Decreasing of filter length (1,26m vs. 4m) has removed issue with swinging of the bags
- The PU-top makes fit to the holeplate very easy
- Spunbund polyester, which is a surface filtration media, is more efficient for pulse cleaning keeping deltaP low for substantially longer than the felt media. An advantage when dP-cleaning as in this case.
- Simultaniously, as a consequence of upgrading to pleated bag filters, the filter surface area has increased by 10%.
- Weldtech technology (ultrasonic welded bands) ensures perfect fit of the bands and equal pleatdistance
TECHNICAL FACTS |
||
| BEFORE | AFTER | |
| Bag solution | Pleated bag solution | |
| Dust type | Manganese, foundry ferrous fume and nickel | |
| Filter type | Filter bag | Pleated Bag |
| Media/cloth type | Needle felt with water/oil repellent finish | Spunbond Polyester with PTFE coating |
| Length | 4000mm | 1260mm |
| Number of bags/cartridges | 960 pcs (spread over 2 collectors) | 960 pcs (spread over 2 collectors) |
| M² in each bag/cartridge | 1,95m² | 2,15m² |
| M² in unit / air volume | 1.872m² / 117.000m3/h | 2.064m² / 117.000m3/h |
Advantages:
- Lower emission levels
- Longer general life cycle of filters and no in-between changeouts
- Same filter types (size of top and length) used in several collectors makes stockholding easy and simple - and provides significant savings
Solution after:
Sales Representative:
PB