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Donghua Technology focuses on the development of advanced technologies for the thorough treatment of exhaust gases from phosphate fertilizers. Author/Source: Donghua Technology’s ECEC; Date: 2019-12-03; Clicks: 53. Recently, the ultra-clean emission and whitening technologies for the exhaust gases generated by phosphate fertilizer production facilities owned by Guizhou Donghua Engineering Co., Ltd., a subsidiary of Donghua Technology, passed the evaluation of proprietary technologies conducted by the China Petroleum and Chemical Industry Planning and Design Association in 2019. The project titled “Industrial Development and Demonstration of Advanced Treatment Equipment for Emissions from Phosphorus Fertilizer Production Facilities”, submitted by the company, was included in Guizhou Province’s Guiyang City science and technology plan for 2019, and the first batch of dedicated funding has been disbursed. Guizhou Donghua has numerous domestic and international project experiences in the advanced treatment of exhaust gases from phosphorus compound fertilizer plants, as well as in technologies for eliminating discoloration, and has accumulated a great deal of successful experience in this field. Due to the special characteristics of phosphorus compound fertilizer production equipment, technical upgrades aimed at thoroughly treating exhaust gases and eliminating tailing effects often face issues such as limited space and difficulties in installation. Both the traditional \"flue gas reheater (GGH) process\" and the \"heat medium recycling (MGGH) process\" involve the reheating of flue gas, and they have disadvantages such as high investment costs, high energy consumption, and large space requirements. Given the frequent chemical phase changes that occur during the production of phosphate fertilizers, Guizhou Donghua utilized the principle of latent heat release during the phase change of water vapor liquefaction to develop a \"gas-water\" phase change exhaust gas reheating process. This process makes use of the latent heat from phase changes to reheat the exhaust gas, thereby significantly reducing energy consumption. It has been successfully applied in various projects such as those carried out by Yuntianhua Group’s Tianan and Honglin companies, as well as the Tianying facility in Qinhuangdao. All of these projects have passed performance tests, demonstrating excellent results in terms of ultra-clean emissions and whiteness reduction. To further optimize the design parameters, achieve equipment integration, and improve operational efficiency, Guizhou Donghua, in collaboration with Shanghai Gaowei Industrial Technology Co., Ltd. and Guiyang University, focused on addressing key technologies such as reducing surface resistance of the equipment, enhancing turbulence in the heat exchangers, expanding the channel dimensions, and delaying the formation of scale on the equipment. Some of these solutions have been turned into proprietary technologies for which patents have been applied; this lays a foundation for the subsequent industrial demonstration and the further promotion and application of comprehensive specialized technologies for advanced exhaust gas treatment.