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Industrial filter cloth, filter mesh usage - horizontal vacuum belt filter press filter cloth - coal chemical industry coal gypsum solid-liquid separation
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- Industrial filter cloth and filter mesh usage Filter cloth for horizontal vacuum belt filter -Coal chemical industry coal gypsum solid-liquid separation
Xiamen Dias Industrial Filter Cloth On-site Operating Condition Case Study Diagram:
Filter type: Horizontal vacuum belt filter
Application industry: Coal chemical industry
Material description: Coal gypsum
Use of industrial filter cloth and filter mesh
—— Key application of horizontal vacuum belt filter in coal chemical industry coal gypsum solid-liquid separation
With “ Double Carbon ” The strategy continues to advance, and the coal chemical industry is accelerating its transformation and upgrading towards green, clean, and efficient development. As one of the by-products in the coal chemical process, Coal gypsum (i.e., flue gas desulfurization by-product gypsum) is at a high level in terms of total emissions and processing difficulty. Its high water content, high viscosity, and multiple impurities make its Solid-liquid separation A key factor restricting stable production and environmental compliance.
Among many separation equipment, Horizontal vacuum belt filter ( Horizontal Vacuum Belt Filter ，abbreviation HVBF ) is widely used in coal gypsum processing due to its continuous operation, high throughput, and automatic cleaning capabilities. Industrial filter cloth and filter mesh, as its core filtration medium, directly determines the efficiency and economy of solid-liquid separation.
This article focuses on the coal gypsum solid-liquid separation process, systematically analyzes the key role, selection ideas, and practical effects of industrial filter cloth and filter mesh on horizontal belt filters, and provides technical references for coal chemical enterprises to optimize and upgrade their by-product processing.
I. Coal gypsum: A “ tough nut to crack ”
Coal gypsum usually comes from coal combustion or gasification Flue gas desulfurization ( FGD ) by-products, its main component is dihydrate gypsum ( CaSO ₄ · 2H ₂ O ) ，mixed with unreacted lime, coal ash residue, heavy metal ions, etc.
The main difficulties in handling coal gypsum include:
- High water content ：The initial water content is usually 35%~50% ，difficult to settle naturally
- Many fine particle components ：The particle size is generally 10~50 Microns, easy to block the filter medium
- Complex chemical properties ：Often contains alkaline and corrosive impurities, and has high requirements for equipment materials
- Strict environmental protection indicators ：If not handled properly, the leachate is easy to exceed the standard and the discharge is not compliant
Therefore, efficient dehydration and solid-liquid separation of coal gypsum has become an important part of the end-of-pipe treatment of the flue gas purification system in coal chemical plants.
II. Horizontal vacuum belt filter: A continuous and stable filtration tool
Horizontal vacuum belt filters, with their high operating efficiency, strong processing capacity, and automated operation, have become the main equipment in coal gypsum dehydration processes. This equipment uses a continuously running filter cloth to evenly spread the coal gypsum slurry onto the filter cloth. A vacuum is applied below the filter cloth to draw the liquid through the filter cloth, forming a dry filter cake.
Its main advantages are:
- Continuous filtration, automatic operation ，saving labor costs
- The filter cloth can be cleaned and tensioned online ，maintaining long-term stable operation
- Large unit area processing capacity ，suitable for processing large-flow by-products such as coal gypsum
- High filter cake dryness ，facilitating subsequent transportation, storage, or comprehensive utilization
However, the realization of equipment performance largely depends on its “ core role ”—— Industrial filter cloth and filter mesh 。
III. Industrial filter cloth and filter mesh: Key carriers of process performance
In horizontal vacuum belt filters, the filter cloth is not only the medium for material filtration, but also undertakes multiple functions such as material conveying, filter cake separation, and filtrate channels.
For the filtration characteristics of coal gypsum, industrial filter cloth needs to have the following performance indicators:
Performance requirements
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Description
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|---|---|
Precise filtration accuracy
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The filter cloth pore size needs to be controlled within 10~30 microns, which can retain fine particles while avoiding filter cloth clogging
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High air permeability
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Ensures rapid drainage under vacuum, improving filtration speed
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Excellent peelability
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The filter cake should be easy to detach from the filter cloth to avoid residual adhesion
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Strong corrosion resistance
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Can withstand pH value fluctuations, saline environments, and other chemical erosion
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Abrasion and tensile resistance
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Maintain dimensional stability and long-lasting strength under continuous pulling and vacuum suction
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In addition, ** filter mesh (support mesh layer) ** is located between the filter cloth and the vacuum box, playing a supporting and protective role, and must also have high strength and wear resistance.
IV. Xiamen Citius (Xiamen Citius) Company filter cloth selection strategy: material, weaving structure and surface technology
Xiamen Citius (Xiamen Citius) Company can research and produce various special performance monofilament materials according to different application conditions of customers. These materials include: ordinary and high hydrolysis resistance PET 、 PA （ PA6、PA66、PA610、PA11、PA12 etc.）、 PP （including high temperature resistance PP ）、 PPS 、 PEEK 、core-shell materials（ PA/PET、PPS/PET ）。These materials have broadened the application fields of Xiamen Citius (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. Xiamen Citius (Xiamen Citius) Company has a technical team engaged in filter material research for many years, 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. Application Practice: Case Study of Coal Chemical Enterprises
Taking a large-scale coal-to-gas project as an example, its wet desulfurization system produces about 200 tons of coal gypsum per day. The original ordinary polyester filter cloth had the following problems:
- The filter cake moisture content is as high as 28% ，affecting transportation and storage
- Frequent filter cloth clogging, vacuum negative pressure cannot be maintained stably
- Short filter cloth replacement cycle, 3 months need to be replaced once
Introducing modified composite filter cloth + After anti-clogging treatment technology, the effect is significant:
- The filter cake moisture content is reduced to 18%-20% ，can be directly stored or used by building material enterprises
- Filtration speed increased 25% ，vacuum system stability enhanced
- Filter cloth service life extended to 9 months or more ，annual cost savings exceeding 30 ten thousand yuan
- Equipment operation continuity significantly improved ，basically realizing maintenance-free operation
In addition, the supporting online cleaning system and filter cloth tensioning correction device are used together to further ensure the efficient and stable operation of the system.
VI. Technical Support for Promoting the Resource Utilization of Coal Gypsum
Efficient dehydration is a prerequisite for the resource utilization of coal gypsum. With the continuous improvement of industrial filter cloth technology, coal gypsum can not only be used as a cement retarder, gypsum board raw material, roadbed material, but also as a soil conditioner in agriculture.
Industrial filter cloth provides in this process:
- Low moisture content solid product output
- Clean and recyclable filtrate separation
- Stable long-term operation support
is the key technical guarantee for coal chemical by-products from “ waste ” to “ secondary resources ” 。
VII. Conclusion
Solid-liquid separation of coal gypsum is both a challenge at the end of the coal chemical industry chain and an important breakthrough in green manufacturing. With the help of horizontal vacuum belt filter automation and large processing capacity, combined with high-performance industrial filter cloth and filter mesh reliable support, the treatment of coal gypsum from “ burden ” to “ added value ” from “ emission ” to “ reuse ”。
In the future, with the further improvement of environmental protection standards in the coal chemical industry and the continuous evolution of industrial filter cloth materials and structural processes, technological innovation in solid-liquid separation will continue to empower the high-quality development of the industry.
For samples, solutions, or case support, please contact Xiamen Citius (Xiamen Citius)(Xiamen Citius) Technical Engineering Team:
- 📧 Email: wyl@citius-filter.com
- 📞 WhatsApp: +86-13950107241
- 🌐 Website: www.citius-filter.com
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