Coal Chemicals Desulfurization Domestic Equipment
In Linfen, Shanxi Province, a groundbreaking acid gas treatment process called "Fengxi Haichuan Catalytic Oxidation" has successfully addressed the long-standing challenge of treating low-temperature and low-concentration acid gases in the coal chemical industry. On November 24, reporters visited the site of the 400,000-ton-per-year methanol phase II project at the Linfen Branch of Shanxi Fengxi Fertilizer Industry (Group) Co., Ltd., where this innovative technology was first applied on an industrial scale. The system not only significantly reduces the sulfur content in the tail gas, far below national environmental discharge standards, but also produces nearly 600 tons of high-quality sulfur annually.
According to reports, the coal chemical and petroleum refining processes generate large amounts of hydrogen sulfide (Hâ‚‚S)-containing gas. This Hâ‚‚S can cause equipment corrosion, degrade product quality, and lead to serious environmental pollution. Around the world, extensive research has been conducted on desulfurization techniques and sulfur recovery methods. However, many existing technologies have limitations, such as low sulfur conversion rates, high energy consumption, and inability to fully meet emission standards in practice.
In China, the coal chemical industry has largely relied on imported or advanced desulfurization technologies. These systems often suffer from inefficiency, high costs, and failure to meet environmental requirements. To address these issues, Fengxi Linyi Branch Co., Ltd. and Shandong Zibo Haichuan Fine Chemicals Co., Ltd. jointly developed the "Fengxi Haichuan Catalytic Oxidation" process, which is specifically designed for low-temperature and low-concentration Hâ‚‚S treatment.
The process involves mixing H₂S-containing acid gas with air and heating it to between 180°C and 220°C before sending it into a reactor where H₂S is directly oxidized. The reactor outlet temperature ranges from 250°C to 280°C, allowing sulfur to precipitate in a downstream separator. According to the company’s technical staff, the main goal of the sulfur recovery section is to remove H₂S from the acid gas and recover sulfur, ensuring that both H₂S and SO₂ levels in the exhaust gas meet national environmental protection standards.
Han Ximin, deputy general manager of Fengxi Linyi Branch, stated that the successful industrial application of the process marks a major breakthrough for China, proving that the country now possesses independent desulfurization and sulfur recovery technologies in the coal chemical sector. This development breaks the previous reliance on foreign technologies and opens up promising prospects for future applications and development.
Compared to existing methods, the "Fengxi Haichuan" process offers significant advantages in terms of process efficiency, environmental impact, investment cost, and operational performance. It has been fully localized in China, with all Hâ‚‚S and SOâ‚‚ emissions meeting national discharge standards. The system also features low operating costs and reduced energy consumption, especially in large-scale sulfur recovery units. In addition, the tail gas treatment process brings substantial economic, environmental, and social benefits, making it a sustainable and forward-looking solution for the industry.
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