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Vacuum belt filter cloth Industrial filter cloth - Horizontal vacuum belt filter machine - Power plant gypsum desulfurization
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Detailed Description
- Vacuum belt filter cloth - Horizontal vacuum belt filter - Power plant gypsum desulfurization
Filter type: Horizontal vacuum belt filter
Application industry: Power plant
Material description: Gypsum desulfurization
Filter cloth model: 1029
Application of industrial filter cloth in horizontal vacuum belt filter —— Key support for power plant gypsum desulfurization and wastewater treatment
With the global energy structure adjustment and increasing environmental protection requirements, clean production and pollution control in coal-fired power plants have become the inevitable direction of industry development. Among them, Flue gas desulfurization ( FGD ， Flue Gas Desulfurization ) technology has been widely applied worldwide. Limestone — gypsum wet desulfurization technology not only effectively reduces sulfur dioxide emissions but also creates conditions for the resource utilization of by-product gypsum. However, in the desulfurization process chain, industrial filter cloth and horizontal vacuum belt filter ( Horizontal Vacuum Belt Filter, HVBF ) ) are often underestimated, yet they play a decisive role in gypsum dehydration and desulfurization wastewater treatment.
1. Background of limestone gypsum wet desulfurization — 石膏湿法脱硫的背景
A large amount of SO 2 ₂ generated during coal combustion, if uncontrolled, causes environmental problems such as acid rain and smog. Limestone gypsum wet desulfurization, due to its high maturity, efficiency, and stable operation, has become the mainstream choice for coal-fired power plants. The process flow is roughly: — Flue gas enters the absorption tower and contacts limestone slurry,
- is absorbed and reacts to form calcium sulfite; 2 ₂ under the action of oxidizing air, calcium sulfite further converts to gypsum (
- CaSO 4 · O 2H₂ ) ; gypsum slurry needs to undergo
- solid-liquid separation and dehydration to obtain by-product gypsum with low moisture content that can be directly used, while the filtrate is recycled back to the system or sent to the wastewater treatment unit. In this stage, the horizontal vacuum belt filter is the core equipment for gypsum dehydration, and the filter cloth is the key to achieving efficient separation.
2. Working principle of horizontal vacuum belt filter
The horizontal vacuum belt filter is a continuous solid-liquid separation device. Its basic working process is:
Evenly distribute gypsum slurry on the filter cloth surface;
- Under vacuum negative pressure, the liquid quickly passes through the filter cloth and is drawn into the collection system, while solid particles remain on the filter cloth forming a filter cake;
- As the filter belt runs, the filter cake undergoes washing, secondary filtration, and discharge;
- The filter cloth is cleaned with high-pressure washing and reused.
- Throughout the process, the filter cloth plays a dual role as
solid-liquid separation medium and filter belt transmission component . It must ensure rapid water penetration from the slurry and effective retention of gypsum crystals, so the filter cloth's performance directly determines the quality and efficiency of gypsum dehydration. 3. Core role of filter cloth in power plant gypsum desulfurization
Improve gypsum quality
- If desulfurized gypsum has too high moisture content, it not only increases transportation and storage difficulty but also affects its value in industries such as building materials. High-performance filter cloth can effectively reduce gypsum moisture content, making gypsum particle size uniform and crystals complete, meeting industrial by-product gypsum application standards.
Improve system circulating water quality - The clarity of filtrate is closely related to the pore size distribution of the filter cloth. Proper filter cloth design ensures low solid suspension concentration in the filtrate, avoiding secondary pollution from system return water.
Reduce energy consumption and operating costs - The permeability and anti-clogging properties of the filter cloth directly affect vacuum utilization efficiency. Low resistance filter cloth reduces filtration energy consumption, extends filter cloth service life, and lowers replacement frequency and maintenance costs.
4. Challenges of filter cloth in desulfurization wastewater treatment
Besides gypsum dehydration, coal-fired power plants also need to treat wastewater generated from flue gas desulfurization. Desulfurization wastewater contains high salt, heavy metal ions, and suspended particles, is corrosive and difficult to treat. Horizontal vacuum belt filters are commonly used for solid particle removal in wastewater, and filter cloth must face the following challenges:
Highly corrosive environment
- Filter cloth must have acid and alkali resistance and oxidation resistance to operate stably over the long term. Wide particle size variation
- From fine colloids to larger particles, filter cloth must balance retention rate and water permeability. Scaling and clogging risk
- 结垢与堵塞风险 Crystallization blockage easily forms in high-salinity environments, requiring filter cloth to have good cleaning recovery ability.
5. Performance Requirements and Technical Development of Filter Cloth
To meet the needs of gypsum desulfurization and wastewater treatment in power plants, the filter cloth needs to have the following characteristics:
- Balance of High Permeability and High Retention Rate Ensure efficient gypsum dehydration and clear filtrate.
- Anti-blocking and Easy to Clean Maintain stable permeability during long-term operation.
- Wear Resistance and High Strength The filter cloth can maintain shape stability under cyclic operation and high-pressure washing.
- Chemical Corrosion Resistance Adapt to the complex chemical environment in desulfurization wastewater.
With technological progress, filter cloth is developing in the following directions:
- Multi-layer Structured Filter Cloth Achieve synergy of different functional layers through composite weaving to improve overall performance.
- Surface Functionalization Treatment Such as anti-adhesion coatings to improve gypsum discharge and self-cleaning ability.
- Intelligent Monitoring and Life Prediction Monitor filter cloth operating status through sensors to achieve predictive maintenance.
6. Industry Trends and Future Outlook
Under the " dual carbon goals ” and strict environmental policies, desulfurization and denitrification systems of coal-fired power plants are continuously upgrading. Comprehensive utilization of by-product gypsum and zero discharge treatment of desulfurization wastewater have become important industry development trends. In this process, the role of filter cloth is increasingly prominent:
- Promote Resource Utilization of By-product Gypsum High-quality gypsum can be widely used in building materials, agriculture, and other fields, achieving waste " to treasure transformation ”。
- Assist Zero Discharge of Wastewater Efficient solid-liquid separation improves wastewater pretreatment effects, creating conditions for deep treatment such as evaporation crystallization.
- Improve Equipment Operation Economy Extended filter cloth life and reduced energy consumption support cost reduction and efficiency improvement for power plants.
7. Conclusion
In the limestone-gypsum wet desulfurization process of power plants, — industrial filter cloth and horizontal vacuum belt filter are key links to ensure process stability, efficiency, and environmental compliance. Whether for gypsum dehydration or desulfurization wastewater treatment, the choice of high-performance filter cloth directly affects the environmental and economic benefits of power plants. In the future, with the in-depth application of new materials, new processes, and intelligent management, filter cloth will no longer be a simple consumable but will become an important technical support driving clean production and green transformation in power plants.
未来，随着新材料、新工艺和智能化管理的深入应用，滤布将不再是单纯的耗材，而是成为推动电厂清洁生产与绿色转型的重要技术支撑。
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