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Belt vacuum filter cloth selection - industrial filter cloth, filter mesh application - aluminum plant power plant gypsum desulfurization
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Detailed Description
- Horizontal belt vacuum filter cloth selection - industrial filter cloth, filter mesh application - aluminum plant power plant gypsum desulfurization
Filter type: Horizontal belt vacuum filter
Application industry: Aluminum plant
Material description: Power plant gypsum desulfurization
Horizontal belt vacuum filter cloth selection
—— Application of industrial filter cloth and filter mesh in aluminum plants and power plant gypsum desulfurization
With the national “ Double carbon ” With the promotion of the policy, traditional high-emission industries, such as aluminum and electricity co-generation and power generation, are facing the reality of increasingly stringent environmental emission standards in the process of achieving green transformation. Among them, desulfurization gypsum, as the main byproduct of the flue gas desulfurization ( FGD ) process, its stable dehydration and efficient processing have become an indispensable part of clean production in aluminum plants and power plants. Due to its continuous, automatic, and efficient process characteristics, the horizontal belt vacuum filter has become the core equipment in the gypsum desulfurization field, and the industrial filter cloth, as the key medium of the filtration system, its performance directly determines the stability and environmental protection level of the entire process chain.
This article will focus on the selection logic of industrial filter cloth on horizontal belt vacuum filters ，combined with application cases of aluminum plants and power plant gypsum desulfurization ，analyzes how filter cloth can achieve efficient solid-liquid separation in a high-corrosion, high-wear, and high-load environment, providing a guarantee for industrial green emissions.
I. Process background of desulfurization gypsum treatment
In coal-fired power plants or aluminum and electricity co-generation enterprises, limestone-gypsum method ( - WFGD ) is commonly used for flue gas desulfurization technology. This method uses lime slurry to react with SO ₂ in flue gas to generate calcium sulfite, which is further oxidized to calcium sulfate (dihydrate gypsum), forming desulfurization gypsum with industrial value. The economic value of desulfurization gypsum depends on its moisture content, purity, and impurity content. To achieve high-quality gypsum byproduct output, effective dehydration must be carried out through mechanical dehydration equipment (such as horizontal belt vacuum filters), and the key control point of this step is the selection and use of filter cloth.
II. Overview of horizontal belt vacuum filter
A horizontal belt vacuum filter is a continuously operating vacuum solid-liquid separation equipment suitable for dewatering scenarios of suspensions or crystalline materials with larger particle sizes. Its core structure includes:
Vacuum box
- Filter cloth (filtration medium)
- Rubber belt (transmission device)
- Drum and pressing system
- Washing and cleaning system
- The material is evenly spread on the filter cloth through the cloth feeding system. After the vacuum pump is started, a negative pressure zone is formed under the filter cloth, causing the liquid to pass through the filter cloth and be drawn away, while the solid (such as gypsum) remains on the filter cloth to form a filter cake. The filter cloth is continuously cleaned and reused during operation.
In this system, the performance indicators of the filter cloth directly affect the clarity of the filtrate, the moisture content of the filter cake, the filtration speed, and the operational stability of the equipment.
III. Special requirements for filter cloth due to the characteristics of desulfurization gypsum
The filtration behavior of gypsum in the desulfurization process has the following characteristics:
Smaller particle size, some components are gelatinous
- The filter cake structure is dense, and dehydration is difficult
- The liquid phase composition is complex, containing
- Ca² ⁺ ₄ 、 ₂ ² ⁻ Cl 、 and other ions, which are highly corrosive Cl There is a risk of gypsum scaling and filter cloth blockage during long-term operation
- Therefore, filter cloth selection must meet the following requirements:
Project
Requirements
|
Filtration accuracy
|
|---|---|
Able to intercept micron-level gypsum particles to prevent turbid filtrate
|
Air permeability and water permeability
|
Ensure vacuum suction penetration while not excessively restricting flow
|
Acid and alkali resistance
|
Tolerate
|
pH value fluctuations to prevent chemical corrosion from causing broken filaments and hardening Tensile strength and wear resistance
|
Withstand belt tension and material friction during continuous operation
|
Easy to clean and non-adhesive
|
Reduce gypsum residue, prevent cloth blockage, and improve recycling efficiency
|
IV. Filter cloth selection recommendations: Material and structure matching application conditions
|
For the typical operating conditions of aluminum plants and power plant gypsum desulfurization, the following types of industrial filter cloths are recommended:
Polyester (
1. 聚酯（ PET Monofilament or multifilament filter cloth
- Advantages Excellent heat resistance, mechanical strength, dimensional stability, and strong hydrolysis resistance
- Applicable scenarios High-temperature desulfurization slurry, continuous operation scenarios
2. Polypropylene ( PP ) filter cloth
- Advantages Excellent acid and alkali corrosion resistance, and excellent chloride ion resistance
- Applicable scenarios In the liquid phase and other ions, which are highly corrosive Cl 、 ₂ ² ⁻ Cl Desulfurization scenarios with high concentration
3. Composite double-layer filter cloth
- Advantages The upper layer improves interception efficiency, while the lower layer enhances drainage and support capabilities, extending the service life
- Applicable scenarios Requires efficient dewatering + High-strength and durable heavy-load operating conditions
4. Anti-clogging surface treatment filter cloth
- Process Heat setting, hot rolling and glazing, PTFE Coating, etc.
- Function Reduce gypsum particle adhesion, reduce clogging frequency, and improve cleaning efficiency
V. Filter Cloth Performance and Desulfurization System Synergistic Optimization
High-performance filter cloths not only improve filtration efficiency but also reduce overall operating costs, achieving system-level efficiency improvements:
- Clear filtrate, reducing downstream sedimentation or circulation pump clogging
- Reduce filter cake moisture content, improving the commercial value of gypsum
- Extended filter cloth life, reducing downtime for replacement
- Achieve automated online washing and maintenance, saving labor
During the design and modification of the desulfurization system, the filter cloth performance parameters should be dynamically matched with the operating data, combined with fluid concentration, vacuum setting, cloth speed adjustment, etc., to achieve system energy saving optimization.
VI. Practical Application Case: Desulfurization System Filter Cloth Optimization Practice of a Large Aluminum Plant
A large aluminum and power co-generation enterprise in western China uses limestone - Gypsum desulfurization method, with 3 set 200m² Horizontal belt vacuum filter, originally using domestic general polyester filter cloth, had the following problems:
- Gypsum filter cake moisture content is high ( 28%-30% )
- Filter cloth operation 3 Severe blockage occurred after months
- Frequent replacement, cumulative downtime accounted for 8%
After adopting customized acid and alkali-resistant composite polyester filter cloth with anti-sticking coating, the effect was significantly improved:
- Filter cake moisture content reduced to 23%-25%
- Filter cloth continuous operating life extended to 9 months
- Annual savings in downtime losses of approximately 50 Ten thousand RMB
VII. Conclusion
As the core medium connecting gypsum desulfurization technology and environmental emission, the performance and reliability of industrial filter cloths are increasingly becoming a key link in the green upgrading of the power, metallurgy, and building materials industries. In the gypsum desulfurization treatment of aluminum plants and thermal power plants, scientific selection based on material characteristics, equipment structure, and operating requirements will be the only way to achieve efficient filtration and cost reduction and efficiency increase.
In the future, as industrial filter cloths develop towards Higher strength, lower resistance, and longer life The application value in desulfurization, denitrification, and solid waste resource utilization will continue to expand, becoming an important support for industrial environmental protection.
For samples, solutions, or case support, please contact Xiamen Citius (Xiamen Citius) Technical Engineering Team:
- 📧 Email: wyl@citius-filter.com
- 📞 WhatsApp: +86-13950107241
- 🌐 Website: www.citius-filter.com
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