Wang Weixing, an expert from the Chinese Metal Society, recently highlighted that sulfur dioxide treatment has become a central issue in China’s environmental management. He pointed out that technical challenges in flue gas desulfurization projects are increasingly evident, and existing desulfurization equipment often requires optimization to improve performance and longevity. According to Wang, corrosion caused by flue gas leads to numerous problems, including inefficiency, high costs, and safety risks, which directly impact the effectiveness of environmental protection efforts. Currently, three main types of anti-corrosion materials are used in desulfurization equipment in China, each with its own limitations. Carbon steel lined with glass fiber-reinforced plastic (FRP), glass flake, or rubber is commonly used, but these materials suffer from poor wear resistance and mismatched thermal expansion coefficients, leading to peeling and damage over time. Ceramic materials, while resistant to some forms of corrosion, cannot withstand the corrosive effects of fluorine in flue gases. Stainless steel, though more resistant to corrosion, struggles under high temperatures and prolonged exposure to sulfur dioxide, fluorine, and chlorine. Wang emphasized that there have been numerous cases where improper desulfurization measures led to equipment corrosion, causing operational failures. He mentioned that companies like Liuzhou Iron and Steel, Shigang, and Pangang have installed desulfurization systems, but many face serious corrosion issues within just a few months. If not repaired or replaced in time, such failures can lead to major production accidents, resulting in leaks, spills, and the release of harmful substances into the environment. However, Wang also shared positive developments: a high-performance composite plastic material with excellent heat resistance, corrosion resistance, and long service life has been successfully developed both domestically and internationally. This material is now being applied in flue gas desulfurization systems in China’s power and non-ferrous metal industries. Even under extreme conditions—such as temperatures ranging from 150°C to 2000°C and sulfuric acid mist—the equipment operates safely without significant corrosion-related issues. Based on this progress, Wang urged industry stakeholders to actively promote the use of such advanced materials. He called on manufacturers of flue gas desulfurization equipment to optimize their material choices, ensuring safer and more efficient operations while eliminating hidden corrosion risks. His message underscores the urgent need for innovation and better material selection in the ongoing effort to address environmental pollution.

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