Fabric Filter Operating Results with 10 m Long Bags and Low Purging Pressures

摘要

Environmental performance of the Gas Suspension Calciners for Alumina installed at QAL and Yarwun in Queensland, Australia, is secured by fabric filters. Gas Suspension Calciners equipped with Fabric Filters represents today’s State of the Art of stationary calciners for Alumina. This paper describe the development of the fabric filter technology relevant for this application including selection of filtration medium from an environmental and cost efficiency point of view. A three year R & D project has demonstrated that in all relevant aspects 10 m long bags can be used for general filter performance within the standard design rules of FLSmidth A/S, Airtech - Air Pollution Control. Purge pressures as low as 1.5 to 2 bar g has proven sufficient at “Standard Conditions”. FLSmidth has been offering filters with 10 m long bags to customers worldwide in Alumina and Cement market segment since quite some time. Five fabric filters orders or ESP conversions have been received so far with 10 m long bags.