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2025
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High-Specific-Surface Calcium Hydroxide: Emerging Trends in its Application for Dry Flue Gas Desulfurization
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In the field of industrial flue gas treatment, dry flue gas desulfurization (FGD) technology is widely used in scenarios such as small and medium-sized boilers, sintering machines, and waste incineration due to its simple process, no wastewater discharge, and relatively low investment. As the core sorbent, high-specific-surface calcium hydroxide is becoming a key driver for improving the efficiency of dry FGD, demonstrating clear application trends.
Traditional Limitations and the Breakthrough
Traditional dry FGD uses ordinary calcium hydroxide, which has a small specific surface area and low porosity. This leads to insufficient contact and reaction with sulfur dioxide (SO₂) gas, generally resulting in desulfurization efficiency struggling to exceed 90%, with a high calcium-to-sulfur ratio and significant operating costs and solid waste generation.
High-specific-surface calcium hydroxide, produced through special physico-chemical processes, features finer particles and a developed microporous structure, giving it a far greater specific surface area than conventional products. This characteristic brings fundamental improvements:
- Multiplied Reactivity: The vast surface area provides numerous "active sites" for the gas-solid reaction, enabling SO₂ to be adsorbed and converted into stable calcium sulfate more rapidly.
- Significantly Enhanced Efficiency: Under similar conditions, using high-specific-surface calcium hydroxide can steadily increase dry FGD efficiency to 95% or higher, meeting increasingly stringent emission standards.
- Combining Economy and Environmental Benefits: Higher reaction efficiency means a lower calcium-to-sulfur ratio, directly reducing sorbent consumption and subsequent solid waste, achieving cost reduction and efficiency improvement.
Future Application Trends
- Becoming Standard in High-Standard Projects: As environmental regulations tighten, new or retrofit projects with high desulfurization requirements are increasingly tending to adopting high-specific-surface calcium hydroxide as the preferred sorbent to ensure stable compliance with emission standards.
- Deep Integration with Advanced Dry Technologies: In advanced processes like circulating fluidized bed desulfurization, highly reactive calcium hydroxide can achieve better circulation and reaction kinetics within the system, maximizing the technology's potential.
- Shift from "Consumable" to "Functional Material": The industry is no longer viewing it merely as a bulk raw material. Instead, customized production of different high-specific-surface grades allows for precise matching with specific operating conditions and process needs, achieving optimal cost-effectiveness.
Conclusion
In summary, leveraging its inherent high reactivity, high-specific-surface calcium hydroxide is driving dry FGD technology towards greater efficiency, economy, and environmental friendliness. This trend is now irreversible. It is not only a powerful tool for meeting current stringent environmental requirements but also a crucial foundation for the continued innovation and advancement of dry desulfurization technology in the future.
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