共查询到19条相似文献,搜索用时 140 毫秒
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针对水煤浆锅炉控制系统的非线性、强耦合、大时滞的特点,设计了一种神经网络预测控制方法.模型采用BP神经网络实现建模,其中网络结构在对水煤浆锅炉燃烧系统分析研究的基础上获得,并经优化数据训练后达到预期结果;预测控制算法采用一步预测滚动优化算法.仿真结果显示该方法控制效果良好,适合水煤浆锅炉的实时控制. 相似文献
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介绍了利用选煤厂微粒尾矿制备的水煤浆应用于中小型热电机组的可能性,确定了该燃料在ДКВР10-13锅炉中燃烧的稳定参数。结果表明:研制的热电机组可有效用于燃烧选煤尾矿(煤泥)水煤浆,锅炉的效率值达到80%或更高。试验结果可为建设电能1.2 MW燃选煤尾矿水煤浆的热电自动化机组提供参考。 相似文献
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为了深入了解水煤浆流化燃烧过程的规律,以"小室"为基础,结合流化床内气固两相流动及传热、水煤浆燃料的热解、挥发分及焦炭燃烧、污染物生成等子模型,建立了水煤浆在流化床锅炉中燃烧的综合数学模型。分析了当水煤浆流化燃烧装置锅炉负荷、过量空气系数及燃料中的挥发分份额等参数发生变化时炉内有关参数沿炉膛高度方向的变化规律。研究结果表明,与燃煤流化床锅炉相比,水煤浆燃烧锅炉炉膛底部的温度明显较低。另外,锅炉负荷越大,炉内温度越高,燃烧条件越好;过量空气系数对燃烧的影响并不是单调变化关系;煤种挥发分越高越有利于燃料的燃烧。 相似文献
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提高电站锅炉热效率,降低NOx等污染物的排放量是电站节能减排必须解决的问题。经过采用经量子遗传算法)QGA)优化参数后的最小二乘支持向量机(LSSVM-QGA)建立燃烧优化模型,预测的锅炉热效率和NOx排放量的平均相对误差分别达到了0.054%和1.229%,其预测精度及泛化能力均较优,有更强的适用性能。在此模型基础上,提出一种采用自适应缩放因子与交叉因子和共享函数机制的差分进化算法(DE),通过其演化博弈论中的NASH均衡,实现锅炉燃烧的多目标优化,结果表明,基于NASH均衡的优化方法可以得到操作变量的最优解集,能够更好地改善运行工况,最终可以实现削峰填谷,使电站锅炉保持一个稳定均衡的燃烧状态。 相似文献
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基于西门子S7-300 PLC提出了水煤浆锅炉燃烧控制解决方案。在传统PID控制方法的基础上加入了模糊控制技术。通过对风量与负荷配比的控制,达到了稳定燃烧的目的。 相似文献
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Mahmoud M. Saafan Mohamed M. Abdelsalam Mohamed S. Elksas Sabry F. Saraya Fayez F. G. Areed 《中国化学工程学报》2017,25(4):463-476
This paper introduces the mathematical model of ammonia and urea reactors and suggested three methods for designing a special purpose controller. The first proposed method is Adaptive model predictive controller, the second is Adaptive Neural Network Model Predictive Control, and the third is Adaptive neuro-fuzzy sliding mode controller. These methods are applied to a multivariable nonlinear system as an ammonia–urea reactor system. The main target of these controllers is to achieve stabilization of the outlet concentration of ammonia and urea, a stable reaction rate, an increase in the conversion of carbon monoxide(CO) into carbon dioxide(CO_2) to reduce the pollution effect, and an increase in the ammonia and urea productions, keeping the NH_3/CO_2 ratio equal to 3 to reduce the unreacted CO_2 and NH_3, and the two reactors' temperature in the suitable operating ranges due to the change in reactor parameters or external disturbance. Simulation results of the three controllers are compared. Comparative analysis proves the effectiveness of the suggested Adaptive neurofuzzy sliding mode controller than the two other controllers according to external disturbance and the change of parameters. Moreover, the suggested methods when compared with other controllers in the literature show great success in overcoming the external disturbance and the change of parameters. 相似文献
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Carmen Riverol V Napolitano 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2000,75(11):1047-1053
This paper outlines the successful application of an adaptive control method in an industrial environment. The control strategy incorporated MRAC (Model Reference Adaptive Control) using an adaptive PID where the adaptive parameter was estimated using a macroscopic energy balance over the control zone based on the concept of a tracking error trajectory. Success is demonstrated in a plant for sugar production where the formation of candy, due to incorrect management, the steam flow to the evaporators prevented the sugar syrups leaving the system to pass to the centrifugal screens. This stopped production three or four times a day for 30 min, leading to serious problems in relation to cost and quality, the evaporators being very sensitive to temperature changes. © 2000 Society of Chemical Industry 相似文献
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W. Kent Oliver Dale E. Seborg D. Grant Fisher 《Chemical Engineering Communications》1974,1(3):133-140
A Model Reference Adaptive Control (MRAC) system is evaluated via hybrid computer simulation and experimental application to a computer-controlled, pilot plant evaporator. In both the simulation and experimental studies, the MRAC system performed well and was insensitive to unmeasured process disturbances, to the choice of the initial control policy and to changes in plant operating conditions. In addition to providing an algorithm for adapting control systems to accommodate changing process parameters, MRAC also provides a systematic approach for tuning or developing multivariable control systems for time-invariant processes. 相似文献
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W. KENT OLIVER DALE E. SEBORG D. GRANT FISHER 《Chemical Engineering Communications》2013,200(3):133-140
A Model Reference Adaptive Control (MRAC) system is evaluated via hybrid computer simulation and experimental application to a computer-controlled, pilot plant evaporator. In both the simulation and experimental studies, the MRAC system performed well and was insensitive to unmeasured process disturbances, to the choice of the initial control policy and to changes in plant operating conditions. In addition to providing an algorithm for adapting control systems to accommodate changing process parameters, MRAC also provides a systematic approach for tuning or developing multivariable control systems for time-invariant processes. 相似文献
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介绍水煤浆特性,水煤浆锅炉与其它锅炉运行成本和烟气污染物排放的比较,水煤浆锅炉站工程设计中需注意的因素. 相似文献
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RBF预测控制在水泥篦冷机系统中的应用 总被引:1,自引:0,他引:1
在分析篦冷机主要性能和工作原理的基础上,根据篦冷机的工作特性,运用RBF神经网络建立控制模型,由寻优算法得到篦速来预测控制篦床压力。现场实际应用表明,RBF神经网络预测控制效果优于传统的PID控制。 相似文献
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应用神经网络对未建模型的非线性随机系统进行控制。采用Spall^「1」提出的同步扰动随机逼近的算法,通过系统的输出误差对神经网络控制器进行训练。因为系统模型未知,本在Spall^「1」的基础上采用了争层能自动增加的神经网络,通过实时的对神经网络的结构进行控制,可以实现对未建模型的非线笥随机系统的最优控制。 相似文献