The main drawback of bag filters is the need for frequent replacement of the Filter bags. In the past, due to a limited range of filter media and lower quality, the technology for manufacturing these bags was not as advanced, and other factors in the dust collection system contributed to shorter lifespans, especially under high-temperature conditions. Under corrosive flue gas environments, some filter bags had to be replaced within just a few months, which significantly increased operational costs and maintenance efforts, causing inconvenience for users.
However, in recent years, China's filter media industry has made significant progress, with a wider variety of materials and improved quality. Notably, high-temperature filter bags have seen rapid development. For example, P84 high-temperature dust filter bags are produced by Austrian companies, while PPS high-temperature filter bags use fibers from the U.S. and Japan. The "Meytas" high-temperature dust filter bags are manufactured using Nomex and Teijin fibers from Japan. Foreign filter materials are now largely produced domestically in China, along with specialized filter bags designed for specific environmental conditions in the country.
Sewing technology for filter bags has also advanced considerably. Companies like Coguth have developed internationally leading "three-needle and six-wire" stitching techniques, and their products are even exported to countries like the U.S., Japan, and Australia. Along with improvements in other aspects of the dust collection system, the lifespan of filter bags has extended significantly—now lasting over two, three, or even four years, with some reaching up to seven years. This improvement meets user requirements and reduces operating costs for bag filters.
Shanghai Kegesi Filter Material Co., Ltd. offers a wide range of filter bags, including polyester, polypropylene, fluoroelastomer, glass fiber, PPS, P84, Metants, Ether Astra, and Teflon series. Choosing the right filter bag material is like "removing adhesion" from the dust collector, making it operate more efficiently. Therefore, selecting a reliable manufacturer that produces high-quality filter bags is essential. While the short lifespan of filter bags used to be a challenge, it is now being effectively addressed.
In China, bag filters—especially those using high-temperature filter materials—are expected to see rapid growth over the next 15 years. The filter bag is the core component of the bag filter system. Typically, a cylindrical pulse filter bag is suspended vertically inside the dust collector. Dust-laden gas enters through the inlet, passes through the hopper, and large particles are separated by inertia, falling directly into the hopper.
As the dust-laden gas moves into the filter area, most of the dust is trapped on the outer surface of the filter bag. Clean gas passes through the filter material and enters the upper chamber before being discharged through the outlet. The induced draft fan draws the dusty gas into the ash hopper, where dust is collected on the outer walls of the filter bags. When the pressure difference increases, the differential pressure gauge triggers the pulse valve, allowing high-pressure air to blow off the accumulated dust.
Filter bags play a crucial role in the operation of the bag filter. Their fabric and design should ensure efficiency, ease of cleaning, and durability. In pulse and airbox-type dust collectors, dust accumulates on the outer surface of the filter bags. As the gas flows through the system, a cage inside the filter bag prevents it from collapsing. The filter bag is an essential component of the dust collector, and we analyze your specific application and working conditions to recommend the most suitable and cost-effective option.
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