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Dust Filtration >> Applications >> Oil refine

Sino Grain & Oil I/E Group Corporation is the top 500 Global company. It has a joint venture in east China which is the largest oil refine for food cooking in the world. The original dust collectors were imported from Donaldson Torit® and Bühler Switzerland.
In Refine Workshop they use white bole to decolorize and de-odorous. DCE type dust collectors were installed to collect the white bole dusts. They are not satisfied with the performance of the filter bags, since there always has a lot of dusts escape from the collector into the workshop when they used indigenous filter bags. They appealed ST Filter for help.

Solution

· After checking the system and the filter bags, ST Filter found three weak points:
· The dimension of the dusts was in between 10um—0.5um, so the filter bags in using--Polyester 500g/m2 was not suitable for the extra fine dust. The replacement bags use BWF needlona® PE/PE 551 MPS. The advantage of the MPS programs is obviously: the maximum possible separation of ultra fine particles of free flowing dust in the micron and sub-micro sector which increases the effective filter area significantly. This is achieved by the use of very fine fiber components in the fiber overlay. The fibers are compressed into a micro-porous filter medium with a new needle technique developed at BWF. MPS® filter media have a great increased filter-active surface area. A dense back-up weave, acting as an additional zone of compression, guarantees the barrier effect below the surface. Separation is surface orientated, ensuring low operating costs by means of fewer cleaning cycles.
· A DCE envelope bag has a felt for seal. ST Filter use circle felt instead of opening felt. Circle felt does not have a gap, so it does not cause dust leak. Circle felt provides an excellent seal result.
Opening felt has a gap, which will cause fine particulate bleed under pressure.

· Needle holes in the vertical seam of a filter bag can be a conduit for fine particulate bleed through. ST Filter use welded tube seam instead of three-needle stitch sewing.

Result

The emission rate reduced to 5mg/Nm3 after installed the replacement bags. The purchase manager does not get the complain from Oil Refine Workshop for illegal emission.