The main drawback of bag filters is the need for frequent replacement of the Filter bags. In the past, due to limited types and poor quality of filter media, the technology for producing and maintaining these bags was not as advanced. Additionally, other factors in the dust removal system contributed to a shorter lifespan, especially under high-temperature conditions. Under corrosive flue gas environments, some filter bags had to be replaced within just a few months, increasing operational costs and maintenance efforts, which created inconvenience for users.
However, in recent years, China's filter media industry has made significant progress. There are now more varieties and higher-quality materials available, particularly in the development of high-temperature filter bags. For example, P84 high-temperature dust filter bags, produced by Austrian companies, are widely used. Similarly, PPS high-temperature filter bags from the U.S. and Japan, and Metants high-temperature filter bags, which are manufactured using Nomex and Teijin fibers, have become common. Many foreign filter materials are now being produced domestically, and special filter bags tailored to specific Chinese conditions have also been developed.
The sewing technology for filter bags has also advanced significantly. Companies like Coguth use internationally leading "three-needle and six-wire" stitching techniques, and their products are exported to developed countries such as the U.S., Japan, and Australia. Along with improvements in other aspects of the dust removal system, the lifespan of filter bags has increased dramatically—now lasting over two, three, or even four years, with some reaching up to seven years. This has greatly reduced operating costs and improved user satisfaction.
Shanghai Kegesi Filter Material Co., Ltd. offers a wide range of filter bags, including polyester, polypropylene, Fluomet, glass fiber, PPS, P84, Metants, Eter Astra, and Teflon series. Choosing the right filter bag material is crucial, as it effectively reduces dust adhesion and ensures smooth operation of the dust collector. Therefore, selecting a reliable manufacturer that produces high-quality filter bags is essential to maximize the efficiency of the bag filter and overcome the issue of short lifespans.
In China, bag filters, especially those designed for high-temperature environments, are expected to see rapid development in the next 15 years. The filter bag is the core component of the system. Typically, cylindrical pulse filter bags are vertically suspended inside the dust collector. Dust-laden gas enters through the inlet and passes through the hopper, where larger particles settle into the hopper due to inertia.
As the gas moves into the filter area, most of the dust is captured on the outer surface of the filter bag. Clean air passes through the filter material and enters the upper chamber before being discharged. The induced draft fan pulls the dusty gas into the ash hopper, where the filter bag separates the dust. When the dust builds up on the outer wall, the differential pressure gauge detects the increase and triggers the pulse valve, allowing high-pressure air to clean the filter bag efficiently.
Filter bags play a critical role in the operation of the system. They must be made of durable, efficient materials that allow for easy dust removal. In pulse and airbox-type dust collectors, the internal cage supports the filter bag, preventing collapse. As an essential component of the dust collector, we analyze your system and environmental conditions to recommend the best-suited filter bag for optimal performance.
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