Integrated treatment of dust, sulfur, and nitrogen oxides in coke oven flue gas

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This post was last edited by “Hasty Passerby” on September 13, 2018, at 17:14. Integrated treatment of dust, sulfur, and nitrogen oxides in coke oven flue gas. Author/Source: China Chemical Industry News. Date: September 13, 2018. Page views: 13. The integrated treatment technology for dust, sulfur, and nitrogen oxides in coke oven flue gas, which utilizes ceramic catalytic filter tubes developed by Huaibei Mining Zisu Environmental Engineering Technology Co., Ltd., was approved by experts organized by the China Coke Industry Association last week. This is the first application of catalytic ceramic filter tube technology in the coking industry, enabling integrated and simultaneous desulfurization, denitrification, and dust removal from coke oven flue gas. The expert group believes that this technology exhibits high innovation in the application of ceramic fibers and catalytic materials, reaching an advanced level in China, and holds significant value for application and dissemination. At present, in China’s coking industry, flue gas purification essentially follows the practices employed in the power industry. Dust, sulfur, and nitrogen oxides are treated using three separate environmental protection processes. This approach not only entails high investment costs, requires substantial land area, and results in high operation and maintenance expenses, but also generates secondary pollutants such as wastewater. In particular, the application of wet and semi-dry desulfurization processes in the coking industry generates additional desulfurization wastewater, increases the moisture content of the flue gases, and conflicts with the latest requirements for flue gas \"de-whitening\". To this end, Huaibei Mining Zishuo Company and Tsinghua University jointly carried out technical research and development, resulting in the creation of catalytic ceramic filter tube technology. This technology utilizes dry desulfurization and denitrification, thereby preventing the formation of secondary pollutants and achieving integrated desulfurization, denitrification, and dust removal. This technology uses a ceramic catalytic filter tube as its core component, which reduces the impact of tar, coke, dust in the flue gas, as well as heavy metal ions in the dust, on the catalyst, thereby extending its service life. At the same time, this technology also removes volatile organic compounds by optimizing and formulating catalysts. Furthermore, the independent chamber design employed in this technology allows for offline maintenance of each chamber, enabling the maintenance of environmental protection facilities without shutting down the coke oven. This technology has been successfully applied to the coke ovens at Anhui Linhuan Chemical Company. Online monitoring data show that all parameters related to the flue gas from the coke ovens meet and even exceed the **flue gas emission standards. The efficiency of desulfurization, denitrification, and dust removal is over 85%, 95%, and 99% respectively, allowing for the effective removal of various acidic gases such as nitrogen oxides and sulfur dioxide. This has solved the flue gas emission problems that have long plagued Anhui Linhuan Chemical Company. According to the relevant officials at Huaibei Mining Zisu Company, in the next step they will optimize and improve the processes, equipment, and technologies based on the suggestions put forward by the expert group, and they will also use market-based approaches to promote the adoption of this technology.