Article(id=1236596125436801094, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1236596124832821317, articleNumber=null, orderNo=null, doi=10.19666/j.rlfd.202408222, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1724774400000, receivedDateStr=2024-08-28, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1772757091148, onlineDateStr=2026-03-06, pubDate=1748102400000, pubDateStr=2025-05-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1772757091148, onlineIssueDateStr=2026-03-06, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1772757091148, creator=13701087609, updateTime=1772757091148, updator=13701087609, issue=Issue{id=1236596124832821317, tenantId=1146029695717560320, journalId=1210938733613449225, year='2025', volume='54', issue='5', pageStart='1', pageEnd='162', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=0, articleOrder=1, issueType=-1, specialIssue=null, createTime=1772757091004, creator=13701087609, updateTime=1772757664851, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1236598531780309922, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1236596124832821317, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1236598531780309923, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1236596124832821317, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=132, endPage=139, ext={EN=ArticleExt(id=1236596125763956810, articleId=1236596125436801094, tenantId=1146029695717560320, journalId=1210938733613449225, language=EN, title=Prediction of key indicators of utility boiler based on multi-task uncertainty loss, columnId=1236596125684265033, journalTitle=Thermal Power Generation, columnName=Power generation technology, runingTitle=null, highlight=null, articleAbstract=
With the increasing demand for flexible operation of power plant boilers, frequent variable-load operation leads to a wide range of fluctuations in pollutant concentrations and flue gas parameters. Modeling of key indicators such as single pollutant or flue gas parameter can no longer meet the actual demand, so it is necessary to consider the coupling of multiple key indicators for synergistic predictive modeling. Based on the historical operation data of coal-fired power plants, feature extraction is performed through kernel function mapping, and a long short-term memory neural network with a hard parameter sharing structure is constructed for multi task prediction modeling. The prediction model is optimized using uncertainty loss methods. The experimental results show that, the proposed prediction model exhibits high prediction accuracy under variable load conditions, and the prediction errors for the key metrics involved in this study are reduced by 25.5%, 41.8% and 4.7%, respectively. The proposed method is capable of predicting several key indicators of utility boilers under variable load conditions, which can assist power plants to achieve pollution control and optimize the thermal efficiency of combustion, and provide technical support for intelligent operation of power plants.
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随着电站锅炉灵活运行需求的增加,频繁的变负荷运行导致污染物含量和烟气参数大范围波动,对单一污染物或烟气参数等关键指标进行建模已无法满足电厂实际需求,因此需要考虑多种关键指标的耦合性进行协同预测建模。基于燃煤电厂的历史运行数据,通过核函数映射进行特征提取,构建硬参数共享结构的长短时记忆神经网络进行多任务预测建模,利用不确定性损失的方法优化预测模型。实验结果表明,所提出的预测模型在变负荷工况下表现出较高的预测精度,对于所涉及的关键指标空气预热器出口烟气含氧量、烟气温度、炉膛出口NOx质量浓度的预测,均方根误差分别降低了25.5%、41.8%和4.7%。所提方法能够在变负荷工况下对电站锅炉多个关键指标进行预测,能够辅助电厂实现污染控制和燃烧效率优化,可为电厂智能化运行提供技术支持。
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1.Shanxi Key Laboratory of Advanced Control and Industrial Intelligence, Taiyuan University of Science and Technology, Taiyuan 030024, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1236610615704343356, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236596125436801094, authorId=1236610615498822447, language=CN, stringName=王宇飞, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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1.太原科技大学先进控制与工业智能山西省重点实验室,山西 太原 030024, bio={"content":"
王宇飞(1996),女,博士研究生,主要研究方向为燃煤发电过程建模、控制与优化,b202215110034@stu.tyust.edu.cn。
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王宇飞(1996),女,博士研究生,主要研究方向为燃煤发电过程建模、控制与优化,b202215110034@stu.tyust.edu.cn。
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变量相关性分析的结果, figureFileSmall=HxR5/EFpkvM2i6KcyZXP3g==, figureFileBig=z4w90y16p1WZn4nE3FTLYw==, tableContent=null), ArticleFig(id=1236610619210780677, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236596125436801094, language=EN, label=Fig.2, caption=
Architecture of a long short-term memory cell, figureFileSmall=RTEcNDRFPNIqUFV4SPgnFA==, figureFileBig=DoJ5meW8eG2x50Hco1uOkA==, tableContent=null), ArticleFig(id=1236610619303055370, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236596125436801094, language=CN, label=图2, caption=
LSTM神经网络单元结构, figureFileSmall=RTEcNDRFPNIqUFV4SPgnFA==, figureFileBig=DoJ5meW8eG2x50Hco1uOkA==, tableContent=null), ArticleFig(id=1236610619420495886, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236596125436801094, language=EN, label=Fig.3, caption=
The architecture of multi-task learning model for hard parameter sharing, figureFileSmall=EDPlZWwHpFWw7BgoY4UFHQ==, figureFileBig=ssV0TylCMKEf7JD+GQZSUg==, tableContent=null), ArticleFig(id=1236610619525353494, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236596125436801094, language=CN, label=图3, caption=
硬参数共享的多任务学习模型结构, figureFileSmall=EDPlZWwHpFWw7BgoY4UFHQ==, figureFileBig=ssV0TylCMKEf7JD+GQZSUg==, tableContent=null), ArticleFig(id=1236610619630211098, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236596125436801094, language=EN, label=Fig.4, caption=
Flowchart of Kernel-LSTM-UL prediction model, figureFileSmall=gZOLCky02mQ1tVDAdnU/UA==, figureFileBig=pk6U0lwaBOMm2QzVrpoeAw==, tableContent=null), ArticleFig(id=1236610619747651615, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236596125436801094, language=CN, label=图4, caption=
Kernel-LSTM-UL预测模型流程, figureFileSmall=gZOLCky02mQ1tVDAdnU/UA==, figureFileBig=pk6U0lwaBOMm2QzVrpoeAw==, tableContent=null), ArticleFig(id=1236610619877675042, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236596125436801094, language=EN, label=Fig.5, caption=
Range of unit load variations in the test set, figureFileSmall=Rtl2bB4qggXIof1HC8Az0g==, figureFileBig=EMQsWPjBGfiTRzUPnCOAvw==, tableContent=null), ArticleFig(id=1236610619999309867, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236596125436801094, language=CN, label=图5, caption=
测试集机组负荷变化范围, figureFileSmall=Rtl2bB4qggXIof1HC8Az0g==, figureFileBig=EMQsWPjBGfiTRzUPnCOAvw==, tableContent=null), ArticleFig(id=1236610620141916212, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236596125436801094, language=EN, label=Fig.6, caption=
Prediction curves for different models, figureFileSmall=WLHthKfQZGRK5XmMQT2t5Q==, figureFileBig=SBvliAjrsNHqNYndBqlNTw==, tableContent=null), ArticleFig(id=1236610620242579517, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236596125436801094, language=CN, label=图6, caption=
不同模型对不同变量的预测曲线, figureFileSmall=WLHthKfQZGRK5XmMQT2t5Q==, figureFileBig=SBvliAjrsNHqNYndBqlNTw==, tableContent=null), ArticleFig(id=1236610620339048516, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236596125436801094, language=EN, label=Fig.7, caption=
Distributions of prediction errors for different models, figureFileSmall=SB8atvpJeMIiJ84Qp8B1MA==, figureFileBig=PoNz1kOuSKKMoo3oPCXGiA==, tableContent=null), ArticleFig(id=1236610620431323210, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236596125436801094, language=CN, label=图7, caption=
不同模型的预测误差分布, figureFileSmall=SB8atvpJeMIiJ84Qp8B1MA==, figureFileBig=PoNz1kOuSKKMoo3oPCXGiA==, tableContent=null), ArticleFig(id=1236610620548763728, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236596125436801094, language=EN, label=Tab.1, caption=
Value ranges for relative parameters
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| 变量名 | 变化范围 | 字母 |
|---|
| 空预器出口烟气含氧量/% | 1.66~7.71 | O |
| 空预器出口烟气温度/℃ | 109.88~145.82 | T |
| 炉膛出口NOx质量浓度/(mg·m–3) | 1.09~531.22 | N |
| 机组负荷/MW | 239.15~581.71 | L |
| 总煤量/(t·h–1) | 237.54~632.88 | F |
| 总风量/(t·h–1) | 692.16~1 413.60 | A |
| 给水量/(t·h–1) | 787.65~2 044.00 | W |
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相关变量的数值范围
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| 变量名 | 变化范围 | 字母 |
|---|
| 空预器出口烟气含氧量/% | 1.66~7.71 | O |
| 空预器出口烟气温度/℃ | 109.88~145.82 | T |
| 炉膛出口NOx质量浓度/(mg·m–3) | 1.09~531.22 | N |
| 机组负荷/MW | 239.15~581.71 | L |
| 总煤量/(t·h–1) | 237.54~632.88 | F |
| 总风量/(t·h–1) | 692.16~1 413.60 | A |
| 给水量/(t·h–1) | 787.65~2 044.00 | W |
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The prediction errors of four forecasting models
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| 评价指标 | 预测模型 | 预测变量字母表示 |
|---|
| O | T | N |
|---|
| δRMSE | LSTM | 0.145 | 0.555 | 39.688 |
| Kernel-LSTM | 0.129 | 0.432 | 38.128 |
| LSTM-UL | 0.141 | 0.421 | 38.752 |
| Kernel-LSTM-UL | 0.108 | 0.323 | 37.836 |
| δMAE | LSTM | 0.102 | 0.425 | 21.116 |
| Kernel-LSTM | 0.091 | 0.330 | 18.787 |
| LSTM-UL | 0.102 | 0.316 | 19.322 |
| Kernel-LSTM-UL | 0.073 | 0.243 | 17.814 |
| δMAPE | LSTM | 2.306 | 0.338 | 17.666 |
| Kernel-LSTM | 2.072 | 0.262 | 13.785 |
| LSTM-UL | 2.247 | 0.250 | 16.722 |
| Kernel-LSTM-UL | 1.656 | 0.193 | 13.407 |
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4种模型预测误差对比
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| 评价指标 | 预测模型 | 预测变量字母表示 |
|---|
| O | T | N |
|---|
| δRMSE | LSTM | 0.145 | 0.555 | 39.688 |
| Kernel-LSTM | 0.129 | 0.432 | 38.128 |
| LSTM-UL | 0.141 | 0.421 | 38.752 |
| Kernel-LSTM-UL | 0.108 | 0.323 | 37.836 |
| δMAE | LSTM | 0.102 | 0.425 | 21.116 |
| Kernel-LSTM | 0.091 | 0.330 | 18.787 |
| LSTM-UL | 0.102 | 0.316 | 19.322 |
| Kernel-LSTM-UL | 0.073 | 0.243 | 17.814 |
| δMAPE | LSTM | 2.306 | 0.338 | 17.666 |
| Kernel-LSTM | 2.072 | 0.262 | 13.785 |
| LSTM-UL | 2.247 | 0.250 | 16.722 |
| Kernel-LSTM-UL | 1.656 | 0.193 | 13.407 |
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