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ISO DIS 22031

Sampling and test method for cleanable filter media taken from filters of systems in operation

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Organization: ISO
Publication Date: 5 April 2019
Status: active
Page Count: 25
ICS Code (Ventilation and air-conditioning systems): 91.140.30
scope:

This International Standard specifies the sampling method of fabric filter media from filter system in operation and test method thereof to evaluate the degradation of filter media for dry type filtering dust collector (hereafter referred to as "bag filters") used in thermal power plants, municipal waste incineration facility, etc.

Bag filters are one of the most widely used dust collectors in industries such as municipal garbage incinerators, coal fired boilers, iron makings, cement factories, power plants, etc. Since filter media are used under various gas and dust circumstances for a long time, its physical and chemical properties change (deteriorate) with operation time due to various causes[1]-[9]. Especially, in the municipal garbage incinerator, bag filter has been used very popularly to overcome dioxin emission[10],[11]. Since users of bag filter system usually evaluated the necessary items for the change in the filter properties with each method by themselves, obtained results were not compatible with each other. For this reason, the establishment of the standard operation management and maintenance of filter system is an important issue to predict the timing of replacement and/or service life time of filter media.

It is usually desirable to remove dust from the filter element before sampling. However, it may be sampled with dust when it is difficult. In any case, special care shall be paid not to scatter too much dust accompanying sampling work and not to bring out extra dust outside the factory.

Since measured physical and chemical properties of the filter media may differ depending on whether or not dust adheres to the media, it is recommended to measure with and without attached dust on the filter media. When dust removal from the filter media is necessary, it shall be carried out using a brush and a vacuum being careful not to damage the filter media.

Sampled filter media may be contaminated with potential hazardous substances so it shall be handled with special care.

[1] Dakin T.W. Electrical Insulation Deterioration Treated as a Chemical Rate Phenomenon. 1948, 6, p. 113

[2] Altenhofen W.C., & Zahnh U. Basic studies on the stability of filtration fabrics. Part 1. The effects of sulphur dioixide and nitrogen oxides on polyacrylonitrile. Text. Res. J. 1988, 58 507-514

[3] Ozdil S. "Study of the resistance of synthetic fibers to Nitrogen Oxides and attempts to improve the hydrolysis stability of polyester fibers by grafting of fluoric monomers" (Dissertation at the Deutsches Wolforshungs-institut/RWTH Aachen, 1989)

[4] Tanaka S., & Kanaoka C. Durability Validation of Synthetic Filter Bags, WCPT4, Sydney (Australia), July 2002

[5] Tanaka S., & Kanaoka C. Durability validation of synthetic filter bags. Filtration. 2004, 4 287-294

[6] The Association of Powder Processing Industry & Engineering (APPIE). NEDO Report on "Test methods of filter media for estimating fabric durability". NEDO, Japan, 2006

[7] Tantapanichakoon W., Hata M., Nitta K., Furuuchi M., Otani Y. Mechnical degradation of filter polymer materias: Polyphenylene sulphide. Polym. Degrad. Stabil. 2006, 91 2614-2621

[8] Donovan R.P. "Fabric Filtration for Combustion Sources". Mercel Dekker Inc., 1985, p. 74

[9] Löffler F., Dietrich H., Flatt W., Simon H.h. "Dust Collection with Bag Filters and Envelope Filters", Frieder. Vieweg & Sohn (Braunschweig/Wiesbaden), 1988, p. 97

[10] Ministry of Health. Japan, Labour and Welfare, Director of Labour Standards Bureau; "Exposure preventive countermeasures to dioxins in works in industrial waste incineration facilities". Notice No. 401, Apr. 25, 2001

[11] Japanese Government. "Act on Special Measures against Dioxins". Act No.105, July 16, 1999, Japan

Document History

ISO DIS 22031
April 5, 2019
Sampling and test method for cleanable filter media taken from filters of systems in operation
This International Standard specifies the sampling method of fabric filter media from filter system in operation and test method thereof to evaluate the degradation of filter media for dry type...

References

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