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To enhance the whole process safety of fan operations and ensure accurate fault diagnosis and long-term production income of thermal power plants, predicting these risk issues is crucial to enhance the safety of the unit. In this paper, we proposed a fan fault diagnosis model of big data platform that integrates multilayer perceptron and polynomial fitting. The fan early warning model was established by multilayer perceptron and polynomial fitting modeling technology, and integrated into the big data platform to find abnormalities which were difficult to find manually during the operation of the fan. By combining data mining with mechanism analysis and feature value knowledge base, the parameters boundary information of fan stall could be excavated, the stall boundary conditions of the fan were accurately configured under various working conditions, and a stall boundary condition diagram was created. By combining those informations with normal operating conditions, the early stall zone can be obtained. Finally, a fault diagnosis model that covers the entire working condition of the fan can be established. Utilizing the comprehensive big data platform that covers, circulates, and maintains fan operation data, a system of intelligent fan patrol model was constructed. The intelligent patrol disk model which replaces the operator was then used to monitor and diagnose the fan running state regularly, which can achieve accurate and safe diagnosis of fan faults, minimize the fault incidence and maximize the personnel reuse rate.

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为了提高火电厂送引风机运行的全程安全化、故障诊断准确化、生产收益长期化,将风险问题前置是提升机组运行安全性的关键。基于此,提出了融合多层感知机和多项式拟合的大数据平台风机故障诊断模型。采用多层感知机和多项式拟合建模技术建立风机预警模型,并将模型部署在大数据平台中,能及时发现风机运行期间人工难以发现的异常。采用数据挖掘、机理分析和特征值知识库相结合的方法,挖掘风机失速的参数边界信息,精准化配置各种工况的风机失速边界条件并绘制失速边界工况图,然后结合正常运行工况得出预警失速区间,最终建立覆盖风机全工况的故障诊断模型。利用大数据平台对风机运行数据全覆盖、全流通、全维护的优势,构建了基于大数据平台的风机智能巡盘模型体系,实现以智能巡盘模型代替运行人员对风机运行状态进行定期巡盘监视和诊断,达到风机故障的准确安全诊断、故障发生率最低化及人员复用率最大化的效果。

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吴青云(1993),男,硕士,工程师,主要研究方向为电厂调试及自动控制优化、大数据平台故障诊断开发与应用,

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吴青云(1993),男,硕士,工程师,主要研究方向为电厂调试及自动控制优化、大数据平台故障诊断开发与应用,

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吴青云(1993),男,硕士,工程师,主要研究方向为电厂调试及自动控制优化、大数据平台故障诊断开发与应用,

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Renewable Energy Resources, 2019, 37(4): 612-617., articleTitle=Fault diagnosis of wind turbine based on Elman neural network trained by artificial bee colony algorithm, refAbstract=null)], funds=[Fund(id=1211002434919469728, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002410978382654, awardId=HNBZ22-Q023, language=EN, fundingSource=Standard Project of China Huaneng Group Co., Ltd.(HNBZ22-Q023), fundOrder=null, country=null), Fund(id=1211002435011744418, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002410978382654, awardId=HNBZ22-Q023, language=CN, fundingSource=中国华能集团有限公司标准项目(HNBZ22-Q023), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1211002422177173764, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002410978382654, xref=null, ext=[AuthorCompanyExt(id=1211002422185562371, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002410978382654, 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caption=The performance drawing of induced draft fan, figureFileSmall=v0qHbxABxLhtzYnkTgLDRw==, figureFileBig=uwB07EhZl7SNtZjcfONTRg==, tableContent=null), ArticleFig(id=1211002430779691599, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002410978382654, language=CN, label=图5, caption=绘制的引风机性能曲线, figureFileSmall=v0qHbxABxLhtzYnkTgLDRw==, figureFileBig=uwB07EhZl7SNtZjcfONTRg==, tableContent=null), ArticleFig(id=1211002430884549200, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002410978382654, language=EN, label=Fig.6, caption=Multilayer perceptron fitting test data of supply fan, figureFileSmall=1q1xn8VLKPqTbPpqTO1+xQ==, figureFileBig=UvriAPCg2Arfy3fqBpio7g==, tableContent=null), ArticleFig(id=1211002430960046672, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002410978382654, language=CN, label=图6, caption=送风机多层感知机拟合测试数据, figureFileSmall=1q1xn8VLKPqTbPpqTO1+xQ==, figureFileBig=UvriAPCg2Arfy3fqBpio7g==, tableContent=null), ArticleFig(id=1211002431056515667, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002410978382654, language=EN, label=Fig.7, caption=Multilayer perceptron fitting test data of induced draft fan, figureFileSmall=kHKj9KeLKS56FDl/qeo6Gg==, figureFileBig=EfohCQAeEzf8TtUbkKSJsg==, tableContent=null), ArticleFig(id=1211002431148790359, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002410978382654, language=CN, label=图7, caption=引风机多层感知机拟合测试数据, figureFileSmall=kHKj9KeLKS56FDl/qeo6Gg==, figureFileBig=EfohCQAeEzf8TtUbkKSJsg==, tableContent=null), ArticleFig(id=1211002431228482138, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002410978382654, language=EN, label=Fig.8, caption=Polynomial fitting test data of supply fan, figureFileSmall=cLkg+ixAvga5bbKrxI1Teg==, figureFileBig=EOaCa+fiXUH/g/aowSl/JQ==, tableContent=null), 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language=EN, label=Fig.10, caption=Supply fan critical stall curve, figureFileSmall=/45IEJEv6coxJA3vQMx/LQ==, figureFileBig=wnsre2eOjYDZzFQ0fsH9zA==, tableContent=null), ArticleFig(id=1211002431639523944, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002410978382654, language=CN, label=图10, caption=送风机临界失速曲线, figureFileSmall=/45IEJEv6coxJA3vQMx/LQ==, figureFileBig=wnsre2eOjYDZzFQ0fsH9zA==, tableContent=null), ArticleFig(id=1211002431715021418, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002410978382654, language=EN, label=Fig.11, caption=Induced draft fan critical stall curve, figureFileSmall=ywWlhtpGidrL9KFL4z4WBQ==, figureFileBig=6YOrCZwdydFfm8sqSeODOw==, tableContent=null), ArticleFig(id=1211002431832461933, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002410978382654, language=CN, label=图11, caption=引风机临界失速曲线, figureFileSmall=ywWlhtpGidrL9KFL4z4WBQ==, figureFileBig=6YOrCZwdydFfm8sqSeODOw==, 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Feedback relations of fan rotor blade

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项目最小值最大值间隔跨度
DCS指示/%010025100
机械指示/(°)–4020560
动叶开度范围/(°)–3620456
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风机动叶反馈关系

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项目最小值最大值间隔跨度
DCS指示/%010025100
机械指示/(°)–4020560
动叶开度范围/(°)–3620456
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Multilayer perceptron fitting results of fan performance graph

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项目提取数据量训练集/测试集数据量的比值测试集平均相对误差δAADX/%
送风机8389:132.61
引风机1 1139:13.62
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风机性能图多层感知机拟合结果

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项目提取数据量训练集/测试集数据量的比值测试集平均相对误差δAADX/%
送风机8389:132.61
引风机1 1139:13.62
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Polynomial fitting results of fan performance graph

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项目提取数据量训练集/测试集数据量的比值测试集平均相对误差δAADX/%
送风机8389:13.31
引风机1 1139:11.21
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风机性能图多项式拟合结果

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送风机8389:13.31
引风机1 1139:11.21
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融合多层感知机和多项式拟合的大数据平台风机故障诊断
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吴青云 , 孟颖琪 , 高景辉 , 何信林 , 高奎 , 赵晖 , 谭祥帅 , 郭云飞 , 牛利涛 , 赵如宇 , 李昭 , 姚智 , 蔺奕存
热力发电 | 发电技术论坛 2024,53(1): 145-153
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热力发电 | 发电技术论坛 2024, 53(1): 145-153
融合多层感知机和多项式拟合的大数据平台风机故障诊断
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吴青云 , 孟颖琪, 高景辉, 何信林, 高奎, 赵晖, 谭祥帅, 郭云飞, 牛利涛, 赵如宇, 李昭, 姚智, 蔺奕存
作者信息
  • 西安热工研究院有限公司,陕西 西安 710054
  • 吴青云(1993),男,硕士,工程师,主要研究方向为电厂调试及自动控制优化、大数据平台故障诊断开发与应用,

Fan fault diagnosis of big data platform based on multilayer perceptron and polynomial fitting
Qingyun WU , Yingqi MENG, Jinghui GAO, Xinlin HE, Kui GAO, Hui ZHAO, Xiangshuai TAN, Yunfei GUO, Litao NIU, Ruyu ZHAO, Zhao LI, Zhi YAO, Yicun LIN
Affiliations
  • Xi’an Thermal Power Research Institute Co, Ltd, Xi’an 710054, China
出版时间: 2024-01-25 doi: 10.19666/j.rlfd.202306103
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为了提高火电厂送引风机运行的全程安全化、故障诊断准确化、生产收益长期化,将风险问题前置是提升机组运行安全性的关键。基于此,提出了融合多层感知机和多项式拟合的大数据平台风机故障诊断模型。采用多层感知机和多项式拟合建模技术建立风机预警模型,并将模型部署在大数据平台中,能及时发现风机运行期间人工难以发现的异常。采用数据挖掘、机理分析和特征值知识库相结合的方法,挖掘风机失速的参数边界信息,精准化配置各种工况的风机失速边界条件并绘制失速边界工况图,然后结合正常运行工况得出预警失速区间,最终建立覆盖风机全工况的故障诊断模型。利用大数据平台对风机运行数据全覆盖、全流通、全维护的优势,构建了基于大数据平台的风机智能巡盘模型体系,实现以智能巡盘模型代替运行人员对风机运行状态进行定期巡盘监视和诊断,达到风机故障的准确安全诊断、故障发生率最低化及人员复用率最大化的效果。

大数据平台  /  风机  /  故障诊断  /  多层感知机  /  多项式拟合

To enhance the whole process safety of fan operations and ensure accurate fault diagnosis and long-term production income of thermal power plants, predicting these risk issues is crucial to enhance the safety of the unit. In this paper, we proposed a fan fault diagnosis model of big data platform that integrates multilayer perceptron and polynomial fitting. The fan early warning model was established by multilayer perceptron and polynomial fitting modeling technology, and integrated into the big data platform to find abnormalities which were difficult to find manually during the operation of the fan. By combining data mining with mechanism analysis and feature value knowledge base, the parameters boundary information of fan stall could be excavated, the stall boundary conditions of the fan were accurately configured under various working conditions, and a stall boundary condition diagram was created. By combining those informations with normal operating conditions, the early stall zone can be obtained. Finally, a fault diagnosis model that covers the entire working condition of the fan can be established. Utilizing the comprehensive big data platform that covers, circulates, and maintains fan operation data, a system of intelligent fan patrol model was constructed. The intelligent patrol disk model which replaces the operator was then used to monitor and diagnose the fan running state regularly, which can achieve accurate and safe diagnosis of fan faults, minimize the fault incidence and maximize the personnel reuse rate.

big data platform  /  fan  /  fault diagnosis  /  multilayer perceptron  /  polynomial fitting
吴青云, 孟颖琪, 高景辉, 何信林, 高奎, 赵晖, 谭祥帅, 郭云飞, 牛利涛, 赵如宇, 李昭, 姚智, 蔺奕存. 融合多层感知机和多项式拟合的大数据平台风机故障诊断. 热力发电, 2024 , 53 (1) : 145 -153 . DOI: 10.19666/j.rlfd.202306103
Qingyun WU, Yingqi MENG, Jinghui GAO, Xinlin HE, Kui GAO, Hui ZHAO, Xiangshuai TAN, Yunfei GUO, Litao NIU, Ruyu ZHAO, Zhao LI, Zhi YAO, Yicun LIN. Fan fault diagnosis of big data platform based on multilayer perceptron and polynomial fitting[J]. Thermal Power Generation, 2024 , 53 (1) : 145 -153 . DOI: 10.19666/j.rlfd.202306103
近年来,国家层面正稳步推进智慧化企业的建设,充分利用新的信息技术,将智能化充分应用到煤炭、电力、运输、化工等产业,建设集中统一的各类管理信息系统,实现运营数字化、生产智能化、管理智慧化[1-3]。因此,发电企业智慧化建设已成为行业内必然的发展趋势。
发电机组故障诊断模型是智慧化建设的主要内容。但是,目前大多数故障诊断模型在实际应用中存在准确率低、局限性大、滞后性强等缺点,导致出现这种情况的原因主要是:
1)在建立故障诊断模型时,通常选择若干个煤电机组稳定运行工况数据用于模型训练,以减少模型可能的影响因素,提高准确性[4-8]。但在建模数据中所包含变工况的信息量较少,仅选择稳定工况得到的模型实用性较低。
2)随着智能算法的快速发展,采用先进算法处理庞大数据的能力也越来越强[9-13]。然而,煤电机组的运行数据具有参数多、噪声大的特点,其中包含运行人员的操作与干预,导致运行数据中加入了大量与操作人员习惯相关联的工况噪声,并且伴随个体变化差异性大及规律性差,常规数据建模清洗方式清洗效果差,模型特征信息提取难度大。
3)火电机组系统模型建立过程中通常采用故障树分析法[14-16]、专家诊断系统[17-20]、人工神经网络建模等[21-27],因方法单一导致模型应用效果差。
本文以风机失速故障诊断模型为例,提出融合多层感知机和多项式拟合的大数据平台风机故障诊断。分别通过多项式拟合得出风机性能模型以及多层感知机来建立风机临界失速曲线模型,结合得到风机失速故障诊断模型,实现当风机运行工况点接近或进入失速区时的提早预警。
本文模型数据来源于超临界2×350 MW机组,时间从2019年7月至2021年11月,数据间隔1 s。
风机失速从实际表征为风机出力不稳定,即出口风压和电流的振荡波动或逐步降低引发的现象。从设备机理特性分析,是由于风机厂制造的叶片本身固有属性,表现为风机存在正常运行区和失速区。当风机运行时出现风压过高且风量过低,即运行工况正接近失速区或处于失速区,此时为风机失速。通过以上分析得出模型需确定临界失速曲线图,并找到风机正常运行工况点与失速临界曲线距离,当风机运行工况点接近或进入失速区时,以此作为风机失速临界曲线评判标准。
根据以上条件,选择风机特征数据,主要包括风机出、入口压力,风机出、入口温度,风机动叶位置反馈,风机流量,总给煤量等。图1图2分别为送、引风机的性能图,其中横坐标为流量,纵为比压能及黄色数据的动叶开度的,鞍形扩散曲线为风机不同角度失速点连线,失速工况点落在马鞍形曲线左上方,均为不稳定工况区,即为失速线。
由于从大数据平台中提取特征数据量庞大,在保证模型精度和降低数据处理量的前提下,提取数据间隔1 s修改为间隔1 min,作为模型开发的原始数据。对数据进行预处理,将小于等于0的数据和空值统一删除,作为模型开发的基础数据。
本模型开发主要依据图1图2所示的送风机、引风机的性能图,其动叶开度数据是离散的,并非连续的。例如图2中引风机的开度有–20°、–16°,却未包含–18.5°、–17°等开度的曲线。另外,送、引风机实际流量数据并不准确,难以利用实测流量数据在性能图中确定运行状态点,需使用数学模型计算比压能。若通过风机性能图中的数据,建立风机性能图的代理模型,可根据比压能的计算值及动叶开度数据,结合风机性能图的代理模型来计算体积流量数据,从而在风机性能图中确定风机的运行状态点。最终,利用风机实际运行状态点,完成风机临界失速曲线,作为评判分析风机失速的方法。则本模型的构建流程如下:
1)提取送、引风机性能图中的数据,建立风机性能图的代理模型;
2)对风机实际运行数据进行预处理,计算出比压能,将风机动叶位置反馈转换为动叶开度数据。基于比压能的计算值及动叶开度数据,利用风机性能图的代理模型,计算出风机体积流量数据,并在风机性能图标记实际运行状态点;
3)提取实际风机运行状态点的上边缘数据点,并对其做δ的增量,作为风机临界失速曲线数据,反映体积流量与阈值比压能之间的关系。得到风机临界失速曲线,作为判断风机失速的参考基准。
通过以上分析得出,本模型需要建立风机性能图和比压能阈值数据的代理模型,根据曲线的特征,可通过多项式拟合和人工神经网络模型建模。因此,拟采用多项式拟合和多层感知机进行建模。
多项式拟合,其本质是一个求解多元线性方程组的问题,可表示为:
f(x)=wTx+b
b处理为w0·x0的形式代入,得到式(1)的矩阵形式:
[1x0x02x0n-1x0n1x0x12xnn1x1n 1xnxn2xnn1xnn][w0w1wn]=[y0y1yn]
式(2)中左边是矩阵x与系数矩阵w的乘积,每个系数矩阵w都对应x中的一列,得到关于x的矩阵,交给线性回归器训练多元线性模型,最终得到一组y0y1yn,使得损失函数接近极小值。
多层感知机除了输入输出层,其中间可以有多个隐藏层,最简单的只含1个隐藏层,即3层的结构,如图3所示。
图3得出,多层感知机的层与层之间是全连接方式。多层感知机由输入层、隐藏层和输出层构成,隐藏层中每一层的输入为上一层的输出,每层的输入首先通过该层神经元的权重w和偏置b进行线性变换,然后用激活函数激活,激活函数的输出再作为下一层的输入,最后一层的结果通过输出层输出作为整个模型的预测结果。激活函数一般都是具有非线性变换能力的函数,能够使感知机具备表达非线性特征的能力,常用的激活函数主要有Sigmoid(S型生长曲线)函数、线性整流(ReLU)函数和tanh(双曲正切函数)函数。
本节介绍风机比压能计算的数学模型,以及动叶反馈和动叶开度换算关系。
式(3)用来计算空气在一定温度和压力条件下的密度:
ρs,i=1.293×273.15273.15+ts,i×ps,i+98 56098 560,i=1,2
式中:i=1,代表入口,i=2,代表出口;ρs,i为送风机入口/出口空气密度,kg/m3ts,i为送风机入口/出口空气温度,℃;ps,i为送风机入口/出口空气压力,Pa。
式(4)用来计算烟气在一定温度和压力条件下的密度:
ρy,j=1.338×273.15273.15+ty,j×py,j+98 56098560,j=1,2
式中:ρy, j为引风机入口/出口烟气密度,kg/m3ty, j为引风机入口/出口烟气温度,℃;py,j为引风机入口/出口烟气压力,Pa。
式(5)和式(6)用来计算送风机A和B的进、出口体积流量:
Vs,A,i=Is,A(qs,A+qs,B)(Is,A+Is,B)ρi,i=1,2
Vs,B,j=Is,B(qs,A+qs,B)(Is,A+Is,B)ρj,j=1,2
式中:Vs,A,i为A送风机入口/出口空气体积流量,m3/s;Vs,B,j为B送风机入口/出口空气体积流量,m3/s;Is,A为A送风机电流,A;Is,B为B送风机电流,A;qs,A为A送风机空气质量流量,kg/h;qs,B为B送风机空气质量流量,kg/h。
式(7)和式(8)用来计算引风机A和B的进、出口体积流量:
Vy,A,i=Iy,A(qm,coal+qm,air)(Iy,A+Iy,B)ρi,i=1,2
Vy,B,j=Iy,B(qm,coal+qm,air)(Iy,A+Iy,B)ρi,i=1,2
式中:Vy,A,i为A引风机入口/出口空气体积流量,m3/s;Vy,B,j为B引风机入口/出口空气体积流量,m3/s;Iy,A为A引风机电流,A;Iy,B为B引风机电流,A;qm,coal为总煤量的质量流量,kg/h;qm,air为总风量的质量流量,kg/h。
式(9)用来计算风机入口和出口的流速:
vi=VS,i=1,2
式中:vi为风机入口/出口流速,m/s;S为风机风道截面积,m2
式(10)用来计算风机入口和出口的动压能:
pd,i=12ρivi2,i=1,2
式中:pd,i为风机入口/出口动压,Pa。
式(11)用来计算风机全压升:
Δp=p2+pd2p1pd1
式中:Δp为风机全压升,Pa。
式(12)用来计算风机的比压能Y
Y=Δpρ1
式中:Y为风机比压能,J/kg。
动叶反馈和动叶开度换算采用式(13):
d=60100R40
式中:d为风机动叶开度;R为风机动叶反馈数值,%。
表1为风机动叶反馈关系。建立风机性能图代理模型时,采用表1中的风机性能图的动叶开度范围、分散控制系统(DCS)指示与机械指示用于式(1)计算风机动叶开度。
采用相对误差绝对值的平均值(δAADX)作为评价风机性能图和临界失速曲线代理模型的精度指标,其计算公式为:
δAADX=1N|Xpred,nXtest,n|Xtest,n×100%
式中:Xpred,n为第n个点的模型预测值;Xtest,n为第n个点的测试值;N为测试集的数据点个数。
模型测试时,对某个时间点的运行数据计算,结合模型计算比压能的数据Ycal,i及动叶开度数据,利用风机性能图的代理模型,得到该时间点风机体积流量数据。然后将体积流量数据代入临界失速曲线代理模型中,计算该体积流量条件下的临界比压能Ylim,i,比较该状态点的比压能计算值Ycal,i与临界Ylim,i,若Ycal,iYlim,i,则向运行人员推送风机失速预警信息;否则,为运行人员推送风机运行正常信息,即可表示为:
{Ycal,iYlim,iYcal,iYlim,i
图1图2所示的风机性能图是图片格式,需将图中的数据提取,建立其代理模型。本模型利用图片数据提取(getdata graph digitizer)软件对风机性能图进行数字化提取。获得风机性能图的基础数据,并分别绘制送风机和引风机的性能曲线,结果如图4图5所示。
风机性能图中提取的数据包含比压能、动叶开度和体积流量。将比压能和动叶开度作为输入参数,拟合得到流量数据,将拟合流量与提取的流量数据进行对比,得出相对误差绝对值的平均值较小模型,为风机性能图的代理模型。采用多层感知机和多项式拟合分别建模。风机性能图中提取的数据,90%为训练集,10%为测试集。采用多层感知机拟合风机性能图数据,结果如表2所示,送风机性能图代理模型的AADX为32.61%,模型精度欠佳。引风机性能图代理模型的AADX为3.62%,精度达到要求。送、引风机测试集数据点与代理模型预测点的图形如图6图7所示。
采用多项式拟合风机性能图的数据,拟合结果见表3,送风机和引风机性能图代理模型的AADX分别为3.31%和1.21%,均在5%以内,满足应用的精度要求。绘制的送风机和引风机测试集的数据点与代理模型预测点的图形如图8图9所示。
对比图5图6图7图8以及表2表3,可以发现多项式拟合模型比多层感知机模型的精度更好,更适用于建立风机性能图代理模型。根据每个状态点的特征数据,计算出比压能和动叶开度,最终计算出风机的体积流量,各个状态点可绘制在风机性能曲线中。
将实际运行状态点的上边缘数据点取出,例如图10图11中蓝色数据点,对其进行δ的增量运算,得到红色数据点,作为临界失速曲线,表现出体积流量与阈值比压能之间的关系。
开发临界失速曲线的代理模型,作为风机失速预警的参考基准,本模型采用多项式拟合和多层感知机分别进行建模。
采用4次多项式拟合红色数据点,得到临界失速曲线的代理模型,并绘制代理模型的曲线,结果如图12图13所示。利用测试集的数据测试模型,其平均相对误差为2.22%,符合工程应用的要求。但是,随着体积流量的增大,曲线有逐步下降的趋势,意味着临界比压能越来越低,这与风机性能图中上边缘的理论风机失速曲线的趋势相违背,因此,多项式拟合不适用于建立临界失速曲线的代理模型。
使用多层感知机模型绘制送、引风机临界失速曲线,结果如图14图15所示。利用测试集的数据测试,送、引风机临界失速曲线平均相对误差为2.09%和0.70%,符合工程应用要求。
通过以上综合分析比较,本模型选用多层感知机模型来建立风机临界失速曲线的代理模型,作为其临界失速曲线。
大数据平台输出结果释义“0”为风机运行正常,“1”为风机失速预警。需要验证模型案例,判定模型功能是否在大数据平台上达到预期效果。
1)使用测试文件中的送风机失速数据进行测试,在平台验证结果为风机失速模型发生预警,并提示相关专家经验指导建议及改善措施,送风机模型参数设置及模型测试结果如图16图17所示。
2)使用测试文件中的引风机失速数据测试,在平台验证结果为发生预警,引风机模型参数设置及模型测试结果如图18图19所示。
通过以上测试,模型输出结果在大数据平台界面作出相应的预警提示,证明此模型的准确性及实用性得到很好验证。
1)基于数据驱动和先验知识双轮驱动,建立基于大数据平台的风机智能巡盘模型,实时扫描和分析风机各运行参数的变化,对发生工况偏离的设备和系统及时预警。
2)数据驱动模型代替运行人员对机组运行状态的定期巡盘监视及诊断,为电厂运行人员和管理人员提供机组运行状态查询、故障状态诊断等信息,实现机组多系统的实时监控与故障预警达到状态监测更全面、机组运行更安全的目的。
3)基于数据挖掘技术建模提供指导,实现发电过程的精准化运行和精细化管理,提高发电力企业在新形势下的核心竞争力,促进燃煤机组安全、高效、绿色、低碳地全周期运行。
  • 中国华能集团有限公司标准项目(HNBZ22-Q023)
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2024年第53卷第1期
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doi: 10.19666/j.rlfd.202306103
  • 接收时间:2023-06-28
  • 首发时间:2025-12-25
  • 出版时间:2024-01-25
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  • 收稿日期:2023-06-28
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Standard Project of China Huaneng Group Co., Ltd.(HNBZ22-Q023)
中国华能集团有限公司标准项目(HNBZ22-Q023)
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    西安热工研究院有限公司,陕西 西安 710054
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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