Newsletter Q1 2010

At the Filtration 2009 Trade Show at the Navy Pier Chicago, Illinois, Evonik Fibres exhibited during the two day show as well as having their 8th Seminar & Dinner. Although the US economy remains slow, traffic at the exhibit was quite good, the first day especially. The advantage of having the booth gave us the opportunity to meet with people that were not attending our events as well as new people now working for companies we associate with.

Evonik Fibres cordially invites you and your guests to join us for our 8th Evonik Fibres seminar and dinner which went as planned with attendees boarding the cruise ship, Anita Dee II at 4:00 pm. The technical seminar, with presentations by Evonik’s Florin Popovici and Rod Hansen, consultant for Eskom South Africa, started at 5:00 pm. Close to 40 project managers, sales personnel, R&D managers and consultants attended the seminar on the second level of the ship, plus an additional 30 people had their small group discussions, and some, relaxed and socialized in the lounge on the main deck level.

This year’s technical seminar was attended by one of our largest groups. One presentation focused on the filtration characteristics using high efficiency fibers through forming of the dust cake and blinding of filter media to typical filter materials used in coal fired boiler applications. Also presented was the filtration performance between round fine fibers, tri-lobal fibers, and multi-lobal fibers. Our featured presenter was Rod Hansen discussing the 16 years experience with pulse jet fabric filter at Eskom power stations in South Africa. This included the details of Eskom ‘s pilot plants; Arnot, Duvha, and Hendrina using various blends of Procon PPS, P84 and acrylic fibers. Both presentations are available soon on the P84 web site.

Asphalt Filtration Efficiency Test
on a test rig according to VDI 3926 - at 77°F - with asphalt dust

Investigated filter media
The P84 felt with the silicone finish
The standard Nomex needle felt
The P84 felt w/ a blend of 0.9 and 1.5 den P84 fibers on the filtration side

Test Conditions
Test rig according to VDI 3926
Temperature: 77 °F
Cleaning tank pressure: 72.5 PSI
Valve opening time: 60ms

The dust concentration was elevated to app. 6.1 gr/ft3 in comparison to the standard tests with Pural NF (2.2 gr/ft3) because the used asphalt dust is a less challenging dust.

Test Procedure

30 cycles at 6.6 ft/min air to cloth ratio, cleaning at reaching 4 in.W.C. differential pressure

30 cycles at 6.6 ft/min, cleaning at reaching 4 in.W.C. differential pressure

30 cycles at 9.8ft/min, cleaning at reaching 4 in.W.C. differential pressure

60 cycles at 13.1 ft/min, cleaning at reaching 4 in.W.C. differential pressure

After each sequence the differential pressure was measured at an air to cloth ratio of 6.6 ft/min before and after an additional cleaning pulse at 6.6 ft/min.
The clean gas concentrations were measured in each sequence by the gravimetric evaluation of an absolute-filter in the clean gas channel.

Summary

• The P84 microfiber felt performs best under test conditions, exhibiting the lowest differential pressure drop and the longest cleaning cycle time in combination with a higher cleaning efficiency (clean gas dust content) than the Nomex felt.
• The Nomex felt shows higher clean gas dust content and pressure drop than the P84 microfiber felt.
• The calandered P84 felt achieves the best filtration efficiency (the lowest clean gas dust content). The densified felt surface and some patchy cleaning results in higher differential pressure drop and shorter cleaning cycle time than the other felts under test conditions.
• The results show that in addition to the fiber, it is important to adopt felt construction and finish (e.g. air permeability, calandering)

For the full report which includes detailed data, charts and graphs can be viewed on our home page www.P84.com in the download section.
“Asphalt Filtration Efficiency Test, P84 Calandered, P84 micro fibre felt, Nomex”

These recommendations/statements do not imply a warranty. For any particular application we request operating details to comment suitability and estimate the bag life.

Evonik Fibres Participates in Bag Filter Workshop
at Kogan Creek Power Station

Kogan Creek Power Station was officially opened in November 2007, making it the newest addition to CS Energy's diverse power portfolio. The coal-fired power station, located in the western Darling Downs near Chinchilla in Queensland was heralded as a new era in coal-fired electricity generation due to its efficiency, environmental performance and innovative design.

Kogan Creek Power Station contains the largest single generating unit in Australia and has one of the lowest environmental impacts of any coal-fired power station nationwide.

Coal is supplied to the power station from the adjacent Kogan Creek Coal mine, which is also owned by CS Energy.