一种燃煤机组SCR脱硝系统出口NOx浓度的相位补偿Smith预估控制方法及系统

By employing the phase-compensated Smith predictive control method, the control problem of the SCR denitrification system under nonlinear and large delay characteristics was solved, achieving high-quality dynamic control of the NOx concentration at the outlet of the SCR denitrification system in coal-fired units, and improving the ammonia injection regulation accuracy and system stability.

CN121918632BActive Publication Date: 2026-07-17ANHUI ANQING WANJIANG POWER GENERATION
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ANHUI ANQING WANJIANG POWER GENERATION
Filing Date
2025-12-31
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing SCR denitrification systems suffer from poor adaptability, insufficient adjustment accuracy, and weak anti-interference ability when faced with nonlinear, time-varying, and large delay characteristics, making it difficult to achieve high-quality dynamic control of NOx concentration at the outlet of SCR denitrification systems in coal-fired power units.

Method used

A phase-compensated Smith predictive control method is adopted. By constructing a two-degree-of-freedom Smith predictive control framework, combined with phase compensation and filters, a dynamic model is established between the ammonia injection valve opening and the outlet NOx concentration. This enables predictive compensation for large delays and large inertia. Phase compensation and filtering are introduced into the error correction channel to improve the loop phase margin and noise immunity. Combined with controller parameter tuning and simulation verification mechanisms, the influence of operating condition fluctuations and parameter drift is suppressed.

Benefits of technology

It significantly improved the dynamic tracking quality and closed-loop stability margin of NOx concentration at the outlet of the SCR denitrification system in coal-fired power units, enhanced the ammonia injection regulation accuracy and anti-disturbance capability, and improved the stability and response speed of the control system.

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Abstract

本发明针对SCR脱硝系统存在的大迟延、大惯性特性导致控制精度不足和稳定性差的问题，公开了一种燃煤机组SCR脱硝系统出口NOx浓度排放的相位补偿Smith预估控制方法及系统，属于火力发电燃煤机组烟气污染物控制技术领域。所述方法包括：采集历史运行数据，通过系统辨识建立SCR脱硝系统的动态特性模型；构建基于相位补偿的Smith预估控制框架；通过设计PID控制器与相位补偿环节参数，改善控制对象的稳定性和响应速度，对惯性时间进行补偿，以提高控制效果；开发控制器，将上述控制方法在实际工业过程中实现应用。本发明所提方法及系统可以对喷氨阀门开度的变化进行预测，做到超前调节，实现SCR脱硝系统的优化控制。
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Citation Information

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