The high-temperature dust removal industry has long been plagued by three pain points: insufficient temperature and corrosion resistance of filter cartridges, easy detachment of membranes, and high operating resistance. Traditional filter cartridges in harsh conditions like steel, power, and waste incineration often have short service lives and low cleaning efficiency, directly increasing maintenance costs and energy consumption.
Technological Breakthrough: Non-Membrane Route and Ultra-Long Specification
Zhejiang Huaji Environmental Protection, together with Northeastern University, MCC South, and Tayho, has recently delivered an answer. The 'Energy-saving, carbon-reducing, high-temperature and corrosion-resistant ultra-long spunlace filter cartridge key technology and industrialization application' project passed the appraisal of the China National Textile and Apparel Council, with the overall technology recognized as internationally advanced. Its core breakthroughs lie in two paths: replacing traditional membrane-covered solutions with non-membrane spunlace filter media to avoid the risk of membrane detachment, and extending the filter cartridge length to 3.5 meters, far exceeding the conventional 2.5-meter specification.
Non-membrane means filtration accuracy relies entirely on the gradient pore structure of the filter media itself. The team achieved precise control of pore size in spunlace filter media through high-pressure wide-width forming technology, combined with a microporous stiffening agent formulation, allowing the media to maintain high breathability while gaining sufficient rigidity to support the ultra-long cartridge. This technical route directly addresses the industry's common problem of 'membrane failure equals cartridge failure'.
Industrial Implementation: Two Bases and Global Market
Transitioning from lab to factory tests manufacturing capability. The project has established two production bases in Tiantai, Zhejiang, and Wuhan, Hubei, with a combined annual capacity of 36 million square meters of filter media. The Wuhan base is equipped with the world's first ultra-wide ultra-high pressure spunlace equipment, making it the only domestic base capable of mass-producing 3.6-meter non-spliced one-piece spunlace filter cartridges. This means downstream customers no longer need to rely on splicing processes, eliminating leakage and strength weak points caused by seams.
Products have been applied on a large scale in industries such as steel, power, and waste incineration. On-site measurements show particulate emissions stably below 3.5 mg/Nm³, far below national ultra-low emission standards. Notably, products have been exported to over 40 countries and regions, indicating that China's technical competitiveness in industrial filtration materials is shifting from 'following' to 'leading'.
Economics and Industry Impact
From a cost perspective, the promotion of non-membrane ultra-long filter cartridges will directly reduce users' filter replacement frequency and system energy consumption. Traditional membrane-covered cartridges typically need replacement every 6-12 months due to membrane detachment, while non-membrane spunlace cartridges can last 18-24 months. Meanwhile, the 3.5-meter ultra-long specification means about 30% fewer cartridges are needed for the same filtration area, and the energy consumption of the accompanying pulse-jet cleaning system also decreases.
For upstream chemical fiber and spunbond nonwoven enterprises, this technological breakthrough opens a new high-value application scenario. Demand for high-temperature resistant fibers (such as aramid and polyphenylene sulfide) is expected to be further stimulated, while the upgrade of spunlace processes will also push equipment manufacturers toward ultra-wide, high-pressure iterations.