This article discusses the desulfurization and denitrification integrated purification technology for activated coke. This technology has been widely used in globally due to its ability to simultaneously remove NO_x, SO₂, dioxin, and dust from the flue gas. The approach discussed adopts a cross-flow method in which the activated coke flows from the top to the bottom in the adsorption tower, and the flue gas passes through the activated coke bed horizontally from the side. To create a more economically appealing solution, the waste heat recovery system is optimized and a regeneration gas processing system is added to recycle the gas with a high concentration of SO₂. In this process, first desulfurization and then denitrification. The denitrification process is performed by selective catalytic reduction of NO_x with NH₃ reaction (NH₃-SCR). The results show that under the flue gas condition (NO_x = 300 mg/Nm³ and SO₂ = 200 mg/Nm³), SO₂ is almost completely removed and the NO_x removal efficiency is greater than 80%. After SO₂ adsorption, the activated coke can be regenerated in a regeneration furnace at 400–450°C and the highly concentrated SO₂ produced during the regeneration process can be further used for the production of ammonium sulfate. The purpose of the regeneration reaction of activated coke is to reactivate and recover the activated coke. Finally, the cost analysis results of the system show that the desulfurization and denitrification integrated purification technology for activated coke has excellent economic benefits.

中文翻译：

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活性焦脱硫脱硝综合净化技术​​工程应用

本文探讨了活性焦脱硫脱硝一体化净化技术。由于该技术能够同时去除烟道气中的 NO _x、SO ₂、二恶英和灰尘，因此在全球范围内得到了广泛应用。所讨论的方法采用错流法，其中活性焦在吸附塔中从顶部流向底部，烟气从侧面水平穿过活性焦床。为了创造更具经济吸引力的解决方案，优化了余热回收系统，并增加了再生气体处理系统，以回收高浓度 SO ₂的气体. 在此过程中，先脱硫，后脱硝。脱硝过程是通过用 NH ₃反应（NH ₃ -SCR）选择性催化还原 NO _{x 来}进行的。结果表明，在烟气条件下（NO _x  = 300 mg/Nm ³和SO ₂  = 200 mg/Nm ³），SO ₂几乎完全去除，NO _x去除效率大于80%。SO ₂吸附后，活性焦可在 400-450°C 的再生炉中再生，高浓度 SO ₂再生过程中产生的硫酸铵可进一步用于生产硫酸铵。活性焦再生反应的目的是对活性焦进行再活化和回收。最后，系统成本分析结果表明，活性焦脱硫脱硝一体化净化技术具有良好的经济效益。