Teijin Frontier has announced today that it has developed a new bag-type filter using Nanofront high-strength ultra-fine polyester fibre that realizes high-efficiency dust collection, energy savings and long life.

Teijin Frontier will market the Nanofront Bag Filter mainly to manufacturers of cement, steel and powder, targeting sales of JPY one billion by 2020.

The bag’s inside is lined with ultra-fine Nanofront fibres, which have a diameter of just 700 nm, creating a finely porous structure for the extra-efficient collection of dust and powder.

The Nanofront Bag Filter can reduce fine powder dust emissions by nearly half compared with existing fluorinated-resin membrane bags. It is expected to satisfy Chinese regulations for powder dust emissions of less than 10mg/m3 in urban areas.

Results of demonstration at cement manufacturing facility

Fluorinated-resin membrane based bag filters – Emissions - 6mg/m3

Nanofront¢ç Bag Filter – Emissions - 3mg/m3

Note: The above performance is not guaranteed.

According to Teijin, the Nanofront Bag Filter also improves ventilation volume by nearly 50% compared with fluorinated-resin membrane bags, and the interval between cleanings to remove dust and powder is prolonged by about 40%. It is also expected to improve productivity by more than 10% by and reducing the cleaning duration. Furthermore, the Nanofront Bag Filter is expected to last longer thanks to its thick fibre layers.

Results of demonstration at cement manufacturing facility

Fluorinated-resin membrane bag filters

Pressure loss1 - 1,500 Pa

Cleaning cycle2 - 270 sec

Nanofront¢ç Bag Filter

Pressure loss1 - 800 Pa

Cleaning cycle2 - 375 sec

Note: The above performance is not guaranteed.

1. Pressure loss: Energy loss per unit volume when fluid passes through bag filter
2. Cleaning cycle: Intervals to remove dust and powder from bag filters

Demands to reduce powder dust emissions are increasing, especially in China, according to Teijin. Regulations now effective in urban China have reduced such of emissions from 30mg/m3 to 10mg/m3. Fluorinated-resin membranes are used for conventional bag filters to reduce emissions by thinning the filtering area and increasing the dust-collection amount, but thinner bag filters clog and decrease ventilation volume.

Also, such membranes sometimes rupture when exhaust energy is increased and they must be used in a series, which adds additional costs. Teijin Frontier’s Nanofront Bag Filter is said to overcome such problems while achieving highly efficient dust collection and ventilation volume.

www.teijin.com