基于专家控制的炉外湿法脱硫自动控制研究及应用
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摘要
针对循环流化床锅炉炉外湿法脱硫过程大迟延、大惯性、非线性、时变等过程特性,提出了一种基于动态叠加的慢速粗调+快速细调+前馈控制的控制策略;将该控制策略与新华DCS相结合应用于某电厂300 MW CFB机组。运行结果表明,炉外石灰石浆液供浆量能较好地跟随脱硫塔内pH值的变化,同时pH值能跟随塔前SO2浓度的变化;在保证出口SO2浓度排放满足环保要求的前提下,pH值达到最优,供浆量使用最少,且pH设定值与pH测量值的偏差在±0.1内。该控制策略的实施解决了炉外湿法脱硫系统长期以来无法实现SO2浓度自动控制的问题,不仅减少了运行人员的工作量,而且减少了石灰石浆液用量,提高了石膏品质。
In view of the characteristics of large delay,large inertia,nonlinearity and time variation and so on in wet desulfurization process outside the circulating fluidized bed boiler,a control strategy of slow coarse adjustment +fast fine adjustment +feedforward control based on dynamic superposition is proposed. The control strategy is combined with Emerson DCS to be applied to a 300 MW CFB unit in a power plant. The operation results show that the limestone slurry outside the furnace can follow the change of pH in the desulfurization tower better,at the same time the pH can follow the change of SO2 concentration in of tower. On the premise of ensuring the export of SO2 concentration to meet the environmental protection requirements,the pH is optimized,the least amount of slurry is used,and the deviation between the pH setting value and the pH measurement value is within ±0.1. The implementation of the control strategy has solved the problem that the wet desulfurization system outside the furnace has not been able to realize the automatic control of SO2 concentration for a long time,it not only reduces the workload of the operators,but also reduces the amount of limestone slurry and improves the quality of gypsum.
In view of the characteristics of large delay,large inertia,nonlinearity and time variation and so on in wet desulfurization process outside the circulating fluidized bed boiler,a control strategy of slow coarse adjustment +fast fine adjustment +feedforward control based on dynamic superposition is proposed. The control strategy is combined with Emerson DCS to be applied to a 300 MW CFB unit in a power plant. The operation results show that the limestone slurry outside the furnace can follow the change of pH in the desulfurization tower better,at the same time the pH can follow the change of SO2 concentration in of tower. On the premise of ensuring the export of SO2 concentration to meet the environmental protection requirements,the pH is optimized,the least amount of slurry is used,and the deviation between the pH setting value and the pH measurement value is within ±0.1. The implementation of the control strategy has solved the problem that the wet desulfurization system outside the furnace has not been able to realize the automatic control of SO2 concentration for a long time,it not only reduces the workload of the operators,but also reduces the amount of limestone slurry and improves the quality of gypsum.
引文
[1]张东平,孙克勤,潘效军,等.湿法烟气脱硫吸收塔仿真模型开发及应用[J].环境科学与技术,2011,34(3):189-192.
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[6]王虎,李少华,刘大任,等. CFB-FGD传质模型的数值模拟[J].中国电机工程学报,2013,33(26):8-13,S2.
[7]喻国,梁双印,李伽炜,等.600MW机组脱硫浆液量变化建模与设备节能匹配特性分析[J].环境工程,2015,33(S1):1039-1043.
[8]侯鹏飞,白建云,张恒吉.湿法脱硫入口SO2浓度对脱硫效率影响的非线性回归分析[J].环境工程,2010,28(6):44-46.
[9]吴剑恒,俞金树,何宏舟.中小型循环流化床锅炉深度脱硫方式的选型与应用[J].沈阳工程学院学报:自然科学版,2015,11(3):223-228.
[10]孔庆甫.FGD控制系统控制策略的优化与改进[J].华电技术,2009,31(10):36-37.
[11]李骏,沈凯,周长城,等.烟气脱硫吸收塔pH值控制策略优化研究[J].环境科学与技术,2012,35(4):43-46.
[12]胡秀丽.湿法烟气脱硫经济运行研究[J].电力设备,2006,7(8):12-15.
[2]卓小芳,何祖威,苟小龙,等.石灰石/石膏湿法烟气脱硫塔的实时仿真研究[J].计算机仿真,2008,25(6):237-239,264.
[3] Hao X W,Ma C Y,Dong Y,et al.Composite fluidization in a circulating fluidized bed for flue gas desulfurization[J].Powder Technology,2012, 215-216:46-53.
[4] Wang X,Li Y J,Zhu T Y,et al. Simulation of the heterogeneous semi-dry flue gas desulfu rization in a pilot CFB riser using the two-fluid model[J].Chemical Engineering Journal,2015,264:479-486.
[5]沈凯,徐海涛,周长城,等.烟气脱硫系统试验及动态建模研究[J].环境工程,2009,27(2):18-21.
[6]王虎,李少华,刘大任,等. CFB-FGD传质模型的数值模拟[J].中国电机工程学报,2013,33(26):8-13,S2.
[7]喻国,梁双印,李伽炜,等.600MW机组脱硫浆液量变化建模与设备节能匹配特性分析[J].环境工程,2015,33(S1):1039-1043.
[8]侯鹏飞,白建云,张恒吉.湿法脱硫入口SO2浓度对脱硫效率影响的非线性回归分析[J].环境工程,2010,28(6):44-46.
[9]吴剑恒,俞金树,何宏舟.中小型循环流化床锅炉深度脱硫方式的选型与应用[J].沈阳工程学院学报:自然科学版,2015,11(3):223-228.
[10]孔庆甫.FGD控制系统控制策略的优化与改进[J].华电技术,2009,31(10):36-37.
[11]李骏,沈凯,周长城,等.烟气脱硫吸收塔pH值控制策略优化研究[J].环境科学与技术,2012,35(4):43-46.
[12]胡秀丽.湿法烟气脱硫经济运行研究[J].电力设备,2006,7(8):12-15.
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