Solving the Challenge of Industrial Flue Gas Purification: Application Targets of High-Temperature Ceramic Fiber Filter Elements


Release Time:

2025-08-14

As a core component in industrial flue gas treatment, high-temperature ceramic fiber filter elements can efficiently remove fine dust particles at ultra-high temperatures. Their excellent high-temperature-resistant filtration precision enhances the safety and stability of the system. With unique material properties and physicochemical mechanisms, they achieve efficient dust removal, desulfurization, denitration, and synergistic control of multiple pollutants under high-temperature complex operating conditions, thus becoming key technical equipment in fields such as waste incineration, biomass power generation, and glass kilns.

  The performance of ceramic fiber filters stems from their composite material system and microstructural design. These filters are based on alumina (Al₂O₃) and silica (SiO₂) with a combined content exceeding 94%. Their physical filtration process relies on the synergistic effect of depth filtration and surface filtration, achieving efficient interception of particulate matter through a multi-stage pore structure.

 

  The filters adopt a gradient pore design: for instance, the outer layer pore size ranges from 10-90μm, while the inner layer ranges from 90-180μm, forming a filtration hierarchy from coarse to fine. When high-temperature flue gas passes through, large particles are first intercepted by the outer pores. Smaller particles, under the inertia of the gas flow, undergo collision and diffusion, embedding into the micro-channels formed by interlaced fibers.

 

  Through inertial interception, gravitational sedimentation, and surface adsorption, multi-dimensional filtration is realized. As a result, the filtration efficiency of ceramic filters for particles larger than 0.1μm exceeds 99.99%, with an emission concentration as low as 5mg/Nm³ or less.
High-Temperature Ceramic Fiber Filter Element - White Tube Without Catalyst

  Within the high-efficiency temperature window of 200°C to 400°C, ceramic filter elements achieve synergistic enhancement of desulfurization and denitration through catalytic coating technology. The catalyst loaded on the inner wall of the filter element is deeply coupled with the filtration process.
 

  NOx in flue gas undergoes selective catalytic reduction (SCR) with NH₃ under the action of the catalyst, resulting in extremely high denitration and desulfurization efficiency. This integrated catalytic-filtration design not only reduces the footprint and energy consumption of independent SCR reactors in traditional processes but also prolongs the contact time between flue gas and the catalyst through the porous structure of the filter element, thereby improving reaction efficiency.

 

  It has a wide range of application targets, such as PM particles, acid gases, air pollutants, etc. The specific application targets and purification mechanisms are shown in the following figure:

Application Targets of High-Temperature Ceramic Fiber Filter Elements

  

Purification Mechanisms of High-Temperature Ceramic Fiber Filter Elements (with/without Catalyst)

  To maintain the performance of the filter elements, regular removal of accumulated particulate matter is required, primarily achieved through pulse jet cleaning. The gradient pore structure design and hydrophobic surface treatment of the filter elements reduce dust adhesion and prolong the cleaning interval.

 

  In practical applications, high-temperature ceramic fiber filter tubes have a service life of over 5 years, which is significantly longer than that of traditional bag filters.
 

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