改进型SNCR烟气脱硝装置

Improved SNCR Denitrification Device

为响应国家号召,利用氮氧化物(NOx)脱除技术降低燃煤电厂NOx排放浓度。以山西省某电站2×350 MW循环流化床机组(CFB)为背景,分析其选择性非催化还原技术(SNCR)脱硝原理与工艺流程。为改善该厂已有脱硝装置尿素溶液与烟气反应不彻底的现状,同时降低尿素溶液的投入量,减少氨逃逸现象的发生,设计了一种改进型SNCR烟气脱硝装置,利用伺服电机带动搅拌杆、传动带、皮带轮、推杆等一系列的传动动作,使得尿素溶液往复进入至反应箱内部,反应箱内部的尿素溶液不断流动,尿素溶液与烟气充分接触,从而提高了烟气与尿素溶液的反应率,提高了装置的工作效率,同时配套降温设备对装置进行循环降温,减小反应热。

In response to the call of our country,NOx removal technology is used to reduce NOx emission concentration of coal-fired power plants.Based on a 2×350 MW circulating fluidized bed unit of a power station in Shanxi Province,the SNCR denitration principle and process flow are analyzed.In order to improve the present situation of incomplete reaction between urea solution and flue gas in the existing denitrification device,reduce the input of urea solution and reduce the occurrence of urea escape,an improved SNCR flue gas denitrification device is designed.To make urea solution reciprocating into the reaction box,The servo motor is used to drive a series of driving actions such as mixing rod,drive belt,belt pulley,push rod,etc.The urea solution in the reaction tank is continuously flowing,and the urea solution is fully contacted with the flue gas,so the reaction rate between the flue gas and urea solution is improved,and the working efficiency of the device is improved,at the same time,the cooling equipment is used to reduce the reaction heat.