BAG FILTER FOR VACUUM DEGASSER APPLICATION
- The Bag Filter unit is to be designed for 35T to 60 T Vacuum De-Gassing unit to suit an effective pumping speed of 85,000 m3/hr to 100000 m3/hr at de-gassing pressure of 0.67 mbar & survive intermittent roughing with sudden flows & pressure.
- The Bag Filter will be designed for continuous operating duty conditions, ensuring emission on clean gas side / at pump inlet is restricted below 10 mg/Nm3.
- The filter unit should be supplied in fully welded condition with maximum finished units to have minimal erection at site time at site, no welding and only bolting is required at site.
- All flanges here need to be machined to have gas tight construction.
- The filter unit to be constructed in MS – IS 2062 & designed to handle a de-gassing pressure of 0.67 mbar, ensuring there is no bulging or collapse of the filter casing.
- A cage ladder for access to clean gas chamber & a full working platform with protection railing around the clean gas chamber to be provided.
- All equipment’s / components shall be manufactured to conform to good engineering practices, suitable for continuous duty conditions.
- Supervision of system erection, testing, commissioning and handing over.
- Bag Filter Design criteria : To suit vacuum duty conditions
- Air flow rate at Bag Filter inlet : 85,000 m3/hr at 0.67 mbar
- Gas pressure constant :1013 mbar
- Nominal flow under vacuum : 48.28 Nm3/hr per 0.17 m3/hr per m2 of filter area
- Type of Bag Filter Proposed : Circular Pulse Jet Cyclonic Bag Filter
- Air temperature at the Bag filter inlet : 120 – 140 deg C
- Filter Model : IA TURBO 3100 – 156 – 293 – 4000
- No. of bags : 156 nos. of 150 mm dia x 4000 mm long
- Filter media selected : High efficiency fine denier needlefelt 575 gsm
- Total Filter Surface Area : 293 m2
- Dust loading at filter inlet : 0.2 kg/tons of liquid steel treated.
- Dust emission limit at pump inlet : Below 20 mg/Nm3 at pump inlet
- Dust composition : Fines of Fe + additives
- Dust properties : Pyrophoric & explosive, can attain static charge
- All flanges of the bag filter will be essentially machined to ensure a gas tight construction, enabling the vacuum creation inside the filter unit with ease and without any leakages.
- The cover on top of the clean gas chamber is a dish end, constructed in 12 mm thick MS with reduction to 10 mm thick when dish end is formed to handle the system vacuum pressure.
- The hopper bottom is fitted with high sealing efficiency flange which is designed as to seal off the vacuum pressure. The handling and the disposal of the dust is done with the opening of flange which has quick acting clamps.
