基于自适应智能前馈的SCR脱硝系统优化控制
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摘要
随着环保要求的不断提高,选择性催化还原(selective catalytic reduction,SCR)烟气脱硝系统得到了广泛应用。针对SCR系统具有的大延迟、大惯性特性,将SCR系统机理模型与前馈控制方法相结合,采用滑动窗口法对模型参数进行更新并及时调整反馈系数,提出自适应智能前馈控制方法。利用现场实际运行数据,通过仿真实验对该方法进行验证,实验结果表明,与传统PID控制方法相比,该方法能够实现喷氨量的准确、及时调节,在保证脱硝效率的同时避免了过量喷氨。
With the incessant improvement of environmental requirements, selective catalytic reduction(SCR) flue gas denitration systems are widely used for power plants. For the large delay and great inertia of SCR system, combining mechanism model of SCR and feedforward control method, employing sliding window method to update model parameters and adjust feedback coefficient in time, self-adaptive intelligent feedforward control method was proposed. Actual operation data was applied to verify the method based on simulation experiment. The results show that comparing with traditional PID control method, this method achieves the accurate and timely control of the amount of ammonia and improves the denitration rate as well as avoids excessive ammonia injection.
With the incessant improvement of environmental requirements, selective catalytic reduction(SCR) flue gas denitration systems are widely used for power plants. For the large delay and great inertia of SCR system, combining mechanism model of SCR and feedforward control method, employing sliding window method to update model parameters and adjust feedback coefficient in time, self-adaptive intelligent feedforward control method was proposed. Actual operation data was applied to verify the method based on simulation experiment. The results show that comparing with traditional PID control method, this method achieves the accurate and timely control of the amount of ammonia and improves the denitration rate as well as avoids excessive ammonia injection.
引文
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[9]郭鹏．模糊前馈与模糊PID结合的风力发电机组变桨距控制[J]．中国电机工程学报，2010,30(8):123-128.Guo Peng. Variable pitch control of wind turbine generator combined with fuzzy feed forward and fuzzy PID controller[J].Proceedings of the CSEE,2010,30(8):123-128(in Chinese).
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[12] Lietti L,Nova I,Tronconi E,et al.Transient kinetic study of the SCR-DeNOx reaction[J].Catalysis Today,1998,45(1-4):85-92.
[13]李昌海，冯慧山，田金海，等．串级前馈方法在SNCR烟气脱硝系统上的应用[J]．自动化与仪表，2016,31(2):47-49,53.Li Changhai,Feng Huishan,Tian Jinhai,et al.Application of cascade feedforward method used in the flue gas system of SNCR denitration[J]. Automation&Instrumentation,2016,31(2):47-49,53(in Chinese).
[14]胡文斌，韩璞，刘淼．基于内模的过热汽温串级控制系统PID参数整定[J]．计算机仿真，2016,33(6):86-90.Hu Wenbin,Han Pu,Liu Miao.PID parameter setting of superheated steam temperature cascade control system based on internal model principle[J]. Computer Simulation,2016,33(6):86-90(in Chinese).
[15]王广军，李刚，沈曙光．基于控制历史的过热汽温模糊串级控制[J]．中国电机工程学报，2005,25(20):89-93.Wang Guangjun,Li Gang,Shen Shuguang.Fuzzycascade control basedon control's historyforthe superheated temperature[J].Proceedings of the CSEE,2005,25(20):89-93(in Chinese).
[16]黄宇，张伟婷，金秀章，等．SCR脱硝系统的线性自抗扰串级控制研究[J]．中国电机工程学报，2018,38(18):5518-5526.Huang Yu,Zhang Weiting,Jin Xiuzhang,et al.Linear active disturbance rejection cascade control of SCR denitration system[J].Proceedings of the CSEE,2018,38(18):5518-5526(in Chinese).
[17]秦天牧，林道鸿，杨婷婷，等．SCR烟气脱硝系统动态建模方法比较[J]．中国电机工程学报，2017,37(10):2913-2919.Qin Tianmu,Lin Daohong,Yang Tingting,et al.Comparative study on dynamic modeling methods of SCR denitration system[J].Proceedings of the CSEE,2017,37(10):2913-2919(in Chinese).
[2]武宝会，崔利．火电厂SCR烟气脱硝控制方式及其优化[J]．热力发电，2013,42(10):116-119,126.Wu Baohui,Cui Li.SCR flue gas denitrification control and optimization in thermal power plants[J].Thermal Power Generation, 2013, 42(10):116-119, 126(in Chinese).
[3]马克茂，朱奕．带有前馈补偿的模糊控制系统及其在锅炉水位控制中的应用[J]．计算机测量与控制，2004,12(6):537-539,546.Ma Kemao, Zhu Yi. Fuzzy control systems with feed-forward compensation and its applications to boil level control[J].Computer Measurement&Control,2004,12(6):537-539,546(in Chinese).
[4]马平，王凯宸，梁薇．基于前馈有约束DMC的锅炉烟气脱硝控制系统设计[J]．热力发电，2017,46(11):73-79.Ma Ping,Wang Kaichen,Liang Wei.Design of flue gas denitration control system based on feedforward constrained dynamic matrix control[J].Thermal Power Generation,2017,46(11):73-79(in Chinese).
[5]李刚，贾晓静，武宝会，等．基于主导因素分析的SCR烟气脱硝系统喷氨量控制[J]．热力发电，2016,45(8):99-103.Li Gang,Jia Xiaojing,Wu Baohui,et al.Spraying ammonia flow control system of SCR denitration system based on leading factor analysis[J]. Thermal Power Generation,2016,45(8):99-103(in Chinese).
[6]李亚宁，王学雷，谭杰，等．焦化换向过程烟气脱硝扰动建模与前馈控制[J]．化工学报，2017,68(8):3168-3176.Li Yaning,Wang Xuelei,Tan Jie,et al.Disturbance modeling and feedforwad control of flue gas denitration in coking reverse process[J].CIESC Journal,2017,68(8):3168-3176(in Chinese).
[7]刘吉臻，邓拓宇，田亮．负荷指令非线性分解与供热机组协调控制[J]．中国电机工程学报，2016,36(2):446-452.Liu Jizhen, Deng Tuoyu, Tian Liang. Nonlinear decomposition of load command and coordinated control for heat supply units[J].Proceedings of the CSEE,2016,36(2):446-452(in Chinese).
[8]纪煜，姚翠霞，祁海旺，等．基于煤量预测前馈的协调控制系统[J]．热力发电，2017,46(7):131-136.Ji Yu,Yao Cuixia,Qi Haiwang,et al.A coordinated control system based on model predictive coal supply feedforward[J].Thermal Power Generation,2017,46(7):131-136(in Chinese).
[9]郭鹏．模糊前馈与模糊PID结合的风力发电机组变桨距控制[J]．中国电机工程学报，2010,30(8):123-128.Guo Peng. Variable pitch control of wind turbine generator combined with fuzzy feed forward and fuzzy PID controller[J].Proceedings of the CSEE,2010,30(8):123-128(in Chinese).
[10]康静秋，杨振勇，李卫华．主蒸汽温度控制系统前馈的优化[J]．热力发电，2013,42(1):79-83.Kang Jingqiu,Yang Zhenyong,Li Weihua.Optimization on feed-forward controller in main steam temperature control system[J].Thermal Power Generation,2013,42(1):79-83(in Chinese).
[11] Nova I,Lietti L,Tronconi E,et al.Transient response method applied to the kinetic analysis of the DeNOx-SCR reaction[J].Chemical Engineering Science,2001,56(4):1229-1237.
[12] Lietti L,Nova I,Tronconi E,et al.Transient kinetic study of the SCR-DeNOx reaction[J].Catalysis Today,1998,45(1-4):85-92.
[13]李昌海，冯慧山，田金海，等．串级前馈方法在SNCR烟气脱硝系统上的应用[J]．自动化与仪表，2016,31(2):47-49,53.Li Changhai,Feng Huishan,Tian Jinhai,et al.Application of cascade feedforward method used in the flue gas system of SNCR denitration[J]. Automation&Instrumentation,2016,31(2):47-49,53(in Chinese).
[14]胡文斌，韩璞，刘淼．基于内模的过热汽温串级控制系统PID参数整定[J]．计算机仿真，2016,33(6):86-90.Hu Wenbin,Han Pu,Liu Miao.PID parameter setting of superheated steam temperature cascade control system based on internal model principle[J]. Computer Simulation,2016,33(6):86-90(in Chinese).
[15]王广军，李刚，沈曙光．基于控制历史的过热汽温模糊串级控制[J]．中国电机工程学报，2005,25(20):89-93.Wang Guangjun,Li Gang,Shen Shuguang.Fuzzycascade control basedon control's historyforthe superheated temperature[J].Proceedings of the CSEE,2005,25(20):89-93(in Chinese).
[16]黄宇，张伟婷，金秀章，等．SCR脱硝系统的线性自抗扰串级控制研究[J]．中国电机工程学报，2018,38(18):5518-5526.Huang Yu,Zhang Weiting,Jin Xiuzhang,et al.Linear active disturbance rejection cascade control of SCR denitration system[J].Proceedings of the CSEE,2018,38(18):5518-5526(in Chinese).
[17]秦天牧，林道鸿，杨婷婷，等．SCR烟气脱硝系统动态建模方法比较[J]．中国电机工程学报，2017,37(10):2913-2919.Qin Tianmu,Lin Daohong,Yang Tingting,et al.Comparative study on dynamic modeling methods of SCR denitration system[J].Proceedings of the CSEE,2017,37(10):2913-2919(in Chinese).