共查询到18条相似文献,搜索用时 62 毫秒
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飞灰含碳量是反映电站煤粉锅炉燃烧效率的一个重要指标。基于误差反向传播(BP)神经网络方法,建立了11-23-1型BP神经网络模型。根据某电站四角切圆煤粉锅炉特点选取了煤粉细度、燃烧器摆角、烟气含氧量、5个煤种参数、燃烧器喷口运行组合等11个影响燃烧的参数作为神经网络的输入因子,对建立的模型进行训练,得到模型参数。以此进行预测,与实际值的误差不超过6%。在此基础上,又提出了单参数影响飞灰含碳量的简化分析方法,使神经网络包含的多维非线性规律在一定条件下简洁、直观地反映出来。计算和分析结果表明,本模型方法能有效提取各参数对飞友含碳量的影响规律,可用于锅炉飞灰含碳量的分析、预测和优化调节。 相似文献
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利用人工神经网络对锅炉飞灰含碳量进行建模,并采用混合遗传算法与复合形法进行运行工况寻优,获得当前最佳的锅炉燃烧调整方式,这种方法同时解决了锅炉变工况下运行参数基准值的问题。应用该模型对某台300MW四角切圆燃煤电站锅炉的飞灰含碳量进行优化控制研究,其结果可指导运行人员进行参数优化调整,降低锅炉飞灰含碳量,提高燃烧经济性。 相似文献
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燃煤锅炉是复杂的多变量系统,其飞灰的含碳量形成机理复杂,不能用简单的数学公式估算。现场实炉测试这些数据具有工作量大,测试工况有限等缺点;燃煤锅炉运行参数及燃料特性等因素影响着飞灰的含碳量,其相互耦合,导致分析数据过程困难。神经网络建模将燃煤锅炉视为黑箱,应用该方法可以良好的描述其输入输出之间的黑箱特性,因此,人工神经网络应用广泛。利用燃煤锅炉试验数据,采用3层BP(back propagation)神经网络构建了锅炉飞灰的含碳量排放特性模型。通过锅炉的实测数据验证,该BP神经网络对飞灰含碳量相对预测误差在0.19%~0.50%,预测效果良好。测试结果表明,建立的神经网络预测模型可以准确逼近验证样本数据,也能够较好的逼近非验证样本数据,具有良好的泛化能力。 相似文献
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Lu Yang Danlong Li Xiaokang Yan 《Energy Sources, Part A: Recovery, Utilization, and Environmental Effects》2018,40(15):1781-1787
Unburned carbon (UC) in coal fly ash indicates the waste of energy source and is an obstacle to the utilization of coal fly ash. The purpose of this study was to investigate the flotation kinetics of the removal of UC from coal fly ash. The collector and frother dosage are key factors for coal fly ash flotation. Six flotation kinetic models were applied to fit the flotation kinetic tests data. The fitted results showed that the classical first-order model had better consistency with the experimental data. The contact angle of flotation concentrates decreased as the flotation time was extended which revealed the decrease of flotation rate. 相似文献
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Ming Xu Danlong Li Kunkun Zeng Guosheng Li 《Energy Sources, Part A: Recovery, Utilization, and Environmental Effects》2018,40(7):847-853
The effects of calcium chloride and sodium chloride on the coal fly ash flotation were investigated by studying the surface properties of coal fly ash. X-ray photoelectron spectroscopy and scanning electron microscopy showed the presence of many lime particles in the coal fly ash, which, together with Ca(OH)2(s), could be adsorbed on the rough surface of unburned carbon particles. The flotation results indicated that calcium chloride reduced the performance of unburned carbon removal from the coal fly ash, whereas sodium chloride increased froth stability thereby improving the flotation performance. 相似文献
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针对生物质锅炉飞灰含碳量较高的问题,文章提出了基于主成分分析法(PCA)或Garson算法与普通LM-BP神经网络相结合的两种生物质锅炉飞灰含碳量预测模型。这两种模型通过对负荷、燃烧室烟气温度、烟气含氧量等17个原始输入变量进行降维得到新输入变量,再进行训练建模,提高了模型精度。利用我国某生物质电厂飞灰含碳量的实测数据对模型进行检验,检验结果表明,LM-Garson-BP神经网络的MAPE为2.09%,MSE为0.11,MAE为0.25,泛化能力最强,稳定性最好。 相似文献
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Three dimensional numerical simulation of bituminous coal reburning in a full-scale tangentially fired boiler was conducted with CFD method to study the effects of reburn zone length, the height of reburn nozzles, the stoichiometric ratio in reburn zone, the reburn fuel fraction and the reburn coal fineness on NOx reduction efficiency and unburned carbon in fly ash. The results indicate that the NOx reduction efficiency reaches the largest value when the relative height of reburn nozzles is about 0.21 and the stoichiometric ratio is between 0.8 and 0.9 in reburn zone; NOx reduction efficiency increases with reburn zone length, reburn fuel fraction and the decrease of reburn coal particle size; the smaller the coal particle size is, the better the burnout performance of coal is. 相似文献
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分析某300MW电站锅炉飞灰含碳量过高的原因,并提出了增设卫燃带,一次风集中布置,合理配比一、二次风,调整煤粉细度,调整出口氧量等优化措施,经改造取得满意效果。 相似文献
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