An NH₃ slip detection device and system were designed and developed. The system includes sampling, absorption, detection, dosing, cleaning, and control components. The problems accompanying low NH₃ slip, easy adsorption and instability, can be effectively overcome by the developed device. Furthermore, an online accurate measurement of NH₃ slip was realized. Meanwhile, the online calibration function of the device addresses the drawbacks of existing online NH₃ slip monitoring devices. The reliability and stability of the detection data were improved, whereas the sampling time, flow rate, gas concentration, and pH, which affect the NH₃ measurement results, were experimentally investigated. The main sampling parameters were optimized by orthogonal experiments, and the measurement error of the detection device was obtained according to experimental results. A correction model for measured values was then established, which further improved the accuracy of the measured data. The device has the advantages of high efficiency, stability, high accuracy, online calibration ability, and high integration compared with existing NH₃ slip detection devices for denitration systems. The developed device can be utilized for online detection of NH₃ slip in the denitration equipment of coal-fired power plants.

设计开发了NH ₃滑动检测装置及系统。该系统包括采样、吸收、检测、加药、清洁和控制组件。所开发的装置可以有效克服NH ₃滑移率低、易吸附和不稳定的问题。此外，实现了NH ₃滑移的在线精确测量。同时，该装置的在线校准功能解决了现有在线NH ₃滑移监测装置的不足。提高了检测数据的可靠性和稳定性，而采样时间、流速、气体浓度和pH值等影响NH ₃测量结果，进行了实验研究。通过正交实验对主要采样参数进行优化，根据实验结果得到检测装置的测量误差。然后建立了测量值的修正模型，进一步提高了测量数据的准确性。该装置与现有脱硝系统NH ₃滑移检测装置相比，具有高效、稳定、精度高、在线标定能力强、集成度高等优点。研制的装置可用于燃煤电厂脱硝设备中NH ₃滑脱的在线检测。