600MW机组烟气脱硝系统NOx多点取样试验研究

为了解决单点取样测量不能准确反映实际烟气NOx排放量及提高氨气喷射调节阀自动调节品质的问题,基于SCR脱硝基本原理,提出了烟气NOx多点取样测量方法,并结合现场实际应用进行分析。结果表明:NOx多点取样测量方法能够提高SCR脱硝系统出口NOx测量的准确性和快速性,并有效解决了锅炉烟气NOx测量倒挂问题(即脱硫系统出口烟气NOx质量浓度大于脱硝系统出口烟气NOx质量浓度),优化了SCR脱硝系统在锅炉变负荷时的跟踪调节效果。

Experimental Study on Multi-point NOx Sampling for the Flue Gas Denitrification System in a 600 MW Unit

To solve the problem that single-point sampling can not reflect the actual NOx emission and to improve the automatic regulation quality of the ammonia injection control valve,a multi-point method was proposed for sampling the NOx concentration in the flue gas,based on the basic principle of SCR denitrification,for which,an application analysis was conducted according to the field conditions.Results show that the multi-point sampling method can improve the measurement accuracy and speed for the outlet NOx emission of the SCR denitrification system,solve the problem that the measured final NOx emission(the outlet value of the desulfurization system)is higher than the outlet value of the SCR denitrification system,and optimize the tracing and control effectiveness for the SCR denitrification system during the process of boiler load variation.