Shijiazhuang Yuqing Environmental Protection Technology Co., Ltd. organized by China Association of Recycling Economy Energy Efficiency Ammonia desulfurization and denitrification and dedusting depth purification technology evaluation of scientific and technological achievements, recently held in Beijing. Accreditation Committee identified this technology has an exemplary role, it is recommended to speed up the promotion. It is understood that the project takes the flue gas from the coal-fired boiler of a fertilizer plant as the research object. In view of the deep purification technology of ammonia desulphurization and denitrification and dust removal, the project separates the concentrated washing zone from the absorption zone and solves the problems of aerosol and ammonia loss and ensures effective adjustment of each Liquid parameters. At the same time, desulfurization tower with multiple absorption spray and ammonia demisting device, can control the amount of ammonia emissions stable. At present, the project achievements have been applied in the flue gas treatment of 2 × 150t + 1 × 90t circulating fluidized bed boiler of Baipo Zhengyuan Fertilizer Co., Ltd. in Shijiazhuang. Monitoring by the Hebei Provincial Environmental Monitoring Center Station showed that the emission concentrations of soot, sulfur dioxide and nitrogen oxides were less than 5mg / Nm3, 35mg / Nm3 and 50mg / Nm3, respectively, achieving ultra-low emission of pollutants. According to the person in charge of Yuqing environmental protection, this technology through multi-level dust, defogging, the flue gas and dust droplets in the depth of removal, and the use of aeration oxidation and oxidation of the co-processing technology to improve the oxidation rate. At the same time, the use of low-density system operating philosophy to improve the solid content of the crystal slurry, the system flushing devices, to prevent desulfurization tower anti-blocking problems.