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| Cause Analysis and Optimization Modification of Typical Faults in Wet Desulfurization System for Cement Production Line under High-sulfur Working Conditions |
| Wang Aiqin
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CNBM Equipment Group, Hefei Zhongya Environmental Protection Technology Co., Ltd. , Tianjin 300133, China
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Abstract Due to the high sulfur content of raw materials and fuels in some domestic cement clinker production lines, the SO2 concentration of kiln-tail flue gas far exceeds the ultra-low emission limits, so it is urgent to equip the production lines with high-efficiency desulfurization devices. Under such circumstances, the limestone-gypsum wet desulfurization system has become the mainstream environmental-protection technology for high-sulfur working conditions in the cement industry, benefiting from its advantages such as desulfurization efficiency ≥95%, strong adaptability to high-sulfur flue gas, and resource utilization of by-product gypsum. Combined with the production characteristics of complex flue-gas components and frequent working-condition fluctuations caused by co-disposal of solid waste in cement kilns, this paper systematically illustrates the reaction mechanism, system composition and control requirements of key process parameters for the limestone-gypsum wet desulfurization system. The causes of typical faults in practical projects are analyzed, including excessive moisture content of gypsum, fire risk during anti-corrosion material construction, water balance disturbance, slurry poisoning in desulfurization tower, and gypsum rain deposition at kiln tail. Optimized technical schemes are put forward, such as upgrading gypsum dehydration process, adopting duplex stainless steel clad plate for anti-corrosion treatment, implementing intelligent flushing control coupled with zero-liquid-discharge of wastewater, pretreating alternative fuels plus flue-gas moisture recovery, and reconstructing multi-stage composite demister. These schemes can provide engineering guidance for stable operation and maintenance and ultra-low emission upgrading of wet desulfurization systems in cement enterprises.
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Received: 24 January 2026
Published: 25 September 2026
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