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Horizontal vacuum belt filter cloth - Industrial filter cloth applications - High-efficiency filtration of fly ash in coal chemical processing
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- Horizontal vacuum belt filter cloth - Industrial filter cloth application - High-efficiency filtration of fly ash in coal chemical processing
Xiamen Citius Industrial Filter Cloth On-site Operating Case Pictures:
Filter type: Horizontal vacuum belt filter
Application industry: Coal chemical industry
Material description: Fly ash
Horizontal vacuum belt filter cloth
—— Application of industrial filter cloth in high-efficiency filtration of fly ash in coal chemical industry
Against the backdrop of the coal chemical industry's increasing move towards green, efficient, and intelligent development, effectively separating and utilizing by-product fly ash has become a key issue for companies to improve both energy efficiency and economic benefits. Fly ash, a common solid waste in processes such as coal gasification, coal-to-oil, and coal-to-methanol, presents challenges to solid-liquid separation equipment due to its high water content, high fineness, and tendency to clog.
In this process, Horizontal vacuum belt filter ( HVBF ) has become a core equipment for fly ash treatment due to its advantages of continuous operation, high processing capacity, and high filtration precision. The industrial filter cloth, however, directly determines the equipment's operating efficiency, filtrate quality, and maintenance costs.
This article will explore the performance characteristics, selection points, and application practices of horizontal vacuum belt filter cloth for fly ash treatment in the coal chemical industry, analyzing the key role of industrial filter cloth in complex operating conditions such as high ash content, high pressure, and high corrosion.
I. Process Background of Fly Ash Treatment in Coal Chemical Industry
Coal chemical processes convert coal into usable gaseous or liquid fuels under high temperature and pressure, producing a large amount of fine ash —— namely fly ash. These fly ashes have the following characteristics:
- Fine particle size, averaging 10~50 micrometers
- Strong surface activity and significant electrical properties
- High water content, strong binding properties, and difficult natural sedimentation
- Components often contain SiO ₂ 、 Al ₂ O ₃ 、 Fe ₂ O ₃ and unburned carbon, etc.
If not efficiently separated and properly handled, fly ash will clog downstream system pipelines, affect production line stability, and even cause environmental and safety risks. Therefore, industrial-grade fly ash dewatering processes must have technical advantages such as high precision, low energy consumption, and continuous operation.
II. Advantages of Horizontal Vacuum Belt Filters
Horizontal vacuum belt filters are typical continuous filtration equipment, particularly suitable for solid-liquid separation of slurry-like materials (such as fly ash slurry). Its structure consists of the following parts:
- Filter cloth drive system
- Vacuum box and liquid collection system
- Filter cloth cleaning device
- Filter cake discharge mechanism
The equipment's operating process is as follows: Fly ash slurry is evenly spread onto the running filter cloth surface via a spreader; a vacuum pump creates negative pressure under the filter cloth, causing the liquid phase to pass through the filter cloth and be drawn away, while the solid phase remains on the filter cloth to form a filter cake. The filter cake is removed by a scraper at the end of the run, and the filter cloth is cleaned with high-pressure water and reused in a cycle.
Due to the extremely small particle size and large specific surface area of fly ash, if the filter cloth does not have good filtration performance, wear resistance, and anti-clogging properties, the following problems are likely to occur:
- Increased vacuum system load and energy consumption
- Filter cloth clogging and decreased filtration efficiency
- High filter cake moisture content, making subsequent processing difficult
- Short filter cloth lifespan and increased maintenance costs
Therefore, reasonable filter cloth selection is crucial for optimizing the fly ash filtration process.
III. Challenges of Fly Ash Filtration to Filter Cloth Performance
For highly viscous, fine-particle, and highly corrosive materials like fly ash, the following key performance requirements are placed on the filter cloth:
Filter Cloth Performance Indicators
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Requirements
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|---|---|
Fine particle interception capability
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The filter cloth pore size needs to be precisely controlled at 10~25 micrometers to prevent ash penetration
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High permeability and stable flow
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Under high negative pressure operation, ensure high filtrate flow rate and avoid local clogging
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Abrasion resistance and tensile strength
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The filter cloth must withstand long-term impact from high-concentration slurry and continuous mechanical traction
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Chemical stability
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Resist corrosion from alkali metal oxides and iron ions in fly ash
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Easy cleaning and anti-adhesion
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Reduce ash adsorption, maintain surface cleanliness, and improve the number of cycles
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IV. Xiamen Citius (Xiamen Citius) Filter Cloth Selection Recommendations: Material, Structure, and Processing Technology
Xiamen Citius (Xiamen Citius) The company can research and produce various special-performance monofilament materials according to different application conditions of customers. These materials include: ordinary and highly hydrolysis-resistant PET 、 PA （ PA6、PA66、PA610、PA11、PA12 etc.）、 PP （including high temperature resistance PP ）、 PPS 、 PEEK 、core-sheath materials（ PA/PET、PPS/PET ）。These materials have broadened the application fields of Xiadyas (Xiamen Citius) Company products and solved the requirements of customers for filter materials in special working conditions.
Xiamen Citius (Xiamen Citius) After nearly 30 years of continuous research and development, the company can provide customers with solutions for filter materials in solid-liquid separation processes, and its research level is leading in China. Xiadyas (Xiamen Citius) Company has a technical team with many years of experience in filter material research, and has the most complete filter material research, testing, and pilot production line in China. It can provide customers with customized and personalized services.
V. Engineering Practice Cases: A large-scale coal-to-olefins project
A coal-to-olefins enterprise in Northwest China uses 5 a horizontal belt vacuum filter, and the original domestic polyester filter cloth frequently encountered problems such as cloth clogging, insufficient vacuum, and high filter cake moisture content.
By introducing high-density monofilament + multifilament composite filter cloth, and combined with coating anti-clogging treatment, the system effect is significantly optimized:
- Increased filtration speed 30% ，increased system processing capacity
- The filter cake moisture content was reduced from the original 27% to 21% ，reducing subsequent drying energy consumption
- The service life of the filter cloth has been increased from 3 months to 8 months or more
- Annual maintenance downtime reduced 40% ，saving over one million yuan in comprehensive costs
In addition, the filter cloth operates stably in extremely cold environments, demonstrating good low-temperature anti-brittle performance.
VI. Industrial Filter Cloth Promotes Resource Utilization of Fly Ash
Efficient fly ash filtration not only helps reduce corporate emissions but also creates conditions for its resource utilization. Currently, many coal chemical enterprises in various regions have used fly ash in cement production, building material filling, and road materials. The key guarantee in this process is high-quality solid-liquid separation.
By using industrial filter cloths with stable performance, high filtration accuracy, and long cycle life, enterprises can achieve:
- Stable output of low-moisture, high-purity fly ash solids
- Reduce the failure rate of the slag removal system and extend the service life of the equipment
- Improve the degree of automation and continuous operation of the production line
- Promote “ coal — ash — building materials ” circular economy closed-loop construction
VII. Conclusion
In the process of coal chemical fly ash treatment, the organic combination of horizontal vacuum belt filter and high-performance industrial filter cloth is the key to achieving green, efficient, and resource-oriented goals. With the improvement of solid waste treatment standards and “ dual carbon ” policy's deepening promotion, filter cloth technology will continue to innovate, towards higher filtration speed, lower resistance, and stronger corrosion resistance.
In the future, industrial filter cloth will not only be a consumable for filtration equipment, but also an important technical support for enterprises' clean production, cost reduction and efficiency increase, and industrial upgrading.
For samples, solutions, or case support, please contact Xiadyas (Xiamen Citius) Technical Engineering Team:
- 📧 Email: wyl@citius-filter.com
- 📞 WhatsApp: +86-13950107241
- 🌐 Website: www.citius-filter.com
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