Article(id=1295068109711365095, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1295068001842262748, articleNumber=null, orderNo=null, doi=10.19666/j.rlfd.202507080, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1753718400000, receivedDateStr=2025-07-29, revisedDate=1757174400000, revisedDateStr=2025-09-07, acceptedDate=1757952000000, acceptedDateStr=2025-09-16, onlineDate=1786697898556, onlineDateStr=2026-08-14, pubDate=1777046400000, pubDateStr=2026-04-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1786697898556, onlineIssueDateStr=2026-08-14, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1786697898556, creator=13701087609, updateTime=1786697898556, updator=13701087609, issue=Issue{id=1295068001842262748, tenantId=1146029695717560320, journalId=1210938733613449225, year='2026', volume='55', issue='4', pageStart='1', pageEnd='190', issueExtLink='null', onlineDate='null', pubDate='1777046400000', pubDateStr='2026-04-25', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1786697872839, creator='13701087609', updateTime=1786698854295, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1295072118417416228, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1295068001842262748, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1295072118417416229, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1295068001842262748, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=140, endPage=147, ext={EN=ArticleExt(id=1295068109916885992, articleId=1295068109711365095, tenantId=1146029695717560320, journalId=1210938733613449225, language=EN, title=Research on precise soot blowing algorithm for waterwall soot blowing based on slagging factor monitoring and machine learning, columnId=1295068056598900878, journalTitle=Thermal Power Generation, columnName=Power generation techonology forum, runingTitle=null, highlight=null, articleAbstract=
[Objective]

Against the problem that the conventional timed and quantitative soot blowing mode is prone to cause local over-blowing and under-blowing of the waterwall, studies are carried out by relying on effective monitoring methods. As slag deposition on waterwall is a key factor affecting the safe and economic operation of thermal power boilers, long-term unresolved local over-blowing or under-blowing will not only accelerate the corrosion and wear of the waterwall, but also increase energy consumption and operational costs of power plants. Therefore, the core goal of this research is to establish a precise soot blowing algorithm to replace the conventional timed and quantitative soot blowing mode and realize adaptive and efficient soot blowing control.

[Methods]

A new type of waterwall slagging monitoring sensor was used to monitor the in-furnace waterwall surface temperature, which can collect real-time, continuous and high-precision temperature data to lay a reliable foundation for subsequent model construction. Three machine learning methods, including eXtreme gradient boosting (XGBoost), light gradient boosting machine (LightGBM) and random forest regression (RFR), were compared to construct theoretical in-furnace waterwall surface temperature models under clean waterwall conditions, and a calculation method for waterwall slagging factor was proposed. On this basis, a precise soot blowing algorithm was established. To verify the optimization effect of this algorithm, a 3-month practical application test was carried out in a 1 030 MW thermal power unit, and the operation data was compared with the original timed and quantitative soot blowing mode.

[Results]

The research shows that the theoretical in-furnace waterwall surface temperature model established by the random forest regression method performed the best, with an R2 of 0.92, δMSE of 73.77, and δMAPE of 1.16%. The implementation of the precise soot blowing algorithm is significantly better than the original quantitative soot blowing mode, with a significant reduction in soot blowing frequency and no deterioration of the waterwall slagging state, and the local maximum temperature of the waterwall is controlled within the safe range, avoiding the risk of tube explosion caused by overheating.

[Conclusion]

This algorithm reduces the consumption of soot blowing steam while ensuring the safety of boiler operation, which directly reduces the daily operation cost of the power plant. Moreover, the reduction of soot blowing frequency also reduces the influence of high-temperature steam on the waterwall, effectively extending the service life of the waterwall and reducing the maintenance cost of the boiler. It can be popularized and applied in thermal power plants of different capacities, and has extremely high application value.

, authors=Jianzhong SHI1, Bing HONG1, Xiaohao WEN2, 3, Zifu SHI2, 3, Pei LI2, 3, Yonggang ZHOU2, 3, authorsList=Jianzhong SHI, Bing HONG, Xiaohao WEN, Zifu SHI, Pei LI, Yonggang ZHOU, authorCompany=null, correspAuthors=Pei LI, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1295068113318466555, articleId=1295068109711365095, tenantId=1146029695717560320, journalId=1210938733613449225, language=CN, title=基于结渣因子监测与机器学习的水冷壁精准吹灰算法研究, columnId=1211002409581679375, journalTitle=热力发电, columnName=发电技术论坛, runingTitle=null, highlight=null, articleAbstract=
【目的】

针对传统定时定量吹灰模式易导致水冷壁局部过吹、欠吹的问题,依托有效监测手段开展研究,旨在构建精准吹灰算法。

【方法】

利用新型水冷壁结渣监测传感器获取水冷壁炉内壁温,对比了3种机器学习方法构建水冷壁洁净状态下的理论炉内壁温模型,提出一种水冷壁结渣因子的计算方法,并据此构建精准吹灰算法,通过实际应用并与原定时定量吹灰模式进行对比,验证了该算法的优化效果。

【结果】

研究表明:随机森林回归方法建立的理论炉内壁温模型表现最佳,R2为0.92、δMSE为73.77、δMAPE为1.16%;精准吹灰算法实施后效果明显优于原定时定量吹灰模式,吹灰频次大幅度降低,且未造成水冷壁结渣状态恶化。

【结论】

该算法在保证锅炉运行安全性的前提下,有效降低了吹灰蒸汽消耗量,具有极高的工程应用价值。

, authors=史建忠1, 洪兵1, 温小豪2, 3, 施子福2, 3, 李培2, 3, 周永刚2, 3, authorsList=史建忠, 洪兵, 温小豪, 施子福, 李培, 周永刚, authorCompany=null, correspAuthors=李培, authorNote=

史建忠(1969),男,高级工程师,主要研究方向为发电厂运行、检修管理及技术创新,

, correspAuthorsNote=
李培(1986),男,博士,专职研究员,主要研究方向为锅炉智能化改造,
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Main design parameters of the boiler

, figureFileSmall=null, figureFileBig=null, tableContent=
项目BMCR工况数值项目BMCR工况数值
过热蒸汽流量/(t·h–13 091.0再热器出口蒸汽压力/MPa5.86
过热器出口蒸汽压力/MPa27.46再热器进口蒸汽温度/℃374
过热器出口蒸汽温度/℃605再热器出口蒸汽温度/℃603
再热蒸汽流量/(t·h–12 580.9省煤器进口给水温度/℃298
再热器进口蒸汽压力/MPa6.06
), ArticleFig(id=1295068126958342209, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295068109711365095, language=CN, label=表1, caption=

锅炉主要设计参数

, figureFileSmall=null, figureFileBig=null, tableContent=
项目BMCR工况数值项目BMCR工况数值
过热蒸汽流量/(t·h–13 091.0再热器出口蒸汽压力/MPa5.86
过热器出口蒸汽压力/MPa27.46再热器进口蒸汽温度/℃374
过热器出口蒸汽温度/℃605再热器出口蒸汽温度/℃603
再热蒸汽流量/(t·h–12 580.9省煤器进口给水温度/℃298
再热器进口蒸汽压力/MPa6.06
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Scopes and optimal values of hyperparameter search

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模型超参数名称搜索范围最优值
XGBoost提升轮次[50,200]77
最大树深度[3,15]14
学习率[0.01,0.3]0.23
样本采样比例[0.6,1.0]0.98
特征采样比例[0.6,1.0]0.96
L1正则化系数[0,1]0.60
L2正则化系数[0,1]0.92
LightGBM提升轮次[50,200]65
最大树深度[3,15]9
学习率[0.01,0.3]0.11
样本采样比例[0.6,1.0]0.98
特征采样比例[0.6,1.0]0.97
叶子节点数[10,100]92
RFR决策树数量[50,200]166
最大树深度[3,15]11
节点分裂最小样本数[2,20]2
叶节点最小样本数[1,10]4
特征采样比例[0.1,1.0]1.0
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超参数搜索范围及最优值

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模型超参数名称搜索范围最优值
XGBoost提升轮次[50,200]77
最大树深度[3,15]14
学习率[0.01,0.3]0.23
样本采样比例[0.6,1.0]0.98
特征采样比例[0.6,1.0]0.96
L1正则化系数[0,1]0.60
L2正则化系数[0,1]0.92
LightGBM提升轮次[50,200]65
最大树深度[3,15]9
学习率[0.01,0.3]0.11
样本采样比例[0.6,1.0]0.98
特征采样比例[0.6,1.0]0.97
叶子节点数[10,100]92
RFR决策树数量[50,200]166
最大树深度[3,15]11
节点分裂最小样本数[2,20]2
叶节点最小样本数[1,10]4
特征采样比例[0.1,1.0]1.0
), ArticleFig(id=1295068127201611844, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295068109711365095, language=EN, label=Tab.3, caption=

Performance comparison between and among different models

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模型R2δMSEδMAPE
XGBoost0.91126.541.52%
LightGBM0.86165.231.74%
RFR0.9273.771.16%
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模型性能对比

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模型R2δMSEδMAPE
XGBoost0.91126.541.52%
LightGBM0.86165.231.74%
RFR0.9273.771.16%
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Comparison of statistical values of soot blowing temperature rise in layer A before and after optimization

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组别最大值最小值平均值四分位距
传统吹灰模式216.709.80103.4567.05
精准吹灰模式188.0360.60125.0123.69
), ArticleFig(id=1295068127428104263, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295068109711365095, language=CN, label=表4, caption=

优化前后A层吹灰温升统计值对比

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组别最大值最小值平均值四分位距
传统吹灰模式216.709.80103.4567.05
精准吹灰模式188.0360.60125.0123.69
), ArticleFig(id=1295068127704928328, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295068109711365095, language=EN, label=Tab.5, caption=

Comparison of blowing frequency

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组别总吹灰频次/次日均吹灰频次/次降低幅度/%
传统吹灰模式96032.0040.22
精准吹灰模式57419.13
), ArticleFig(id=1295068127830757449, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295068109711365095, language=CN, label=表5, caption=

吹灰频次对比

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组别总吹灰频次/次日均吹灰频次/次降低幅度/%
传统吹灰模式96032.0040.22
精准吹灰模式57419.13
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基于结渣因子监测与机器学习的水冷壁精准吹灰算法研究
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史建忠 1 , 洪兵 1 , 温小豪 2, 3 , 施子福 2, 3 , 李培 2, 3 , 周永刚 2, 3
热力发电 | 发电技术论坛 2026,55(4): 140-147
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热力发电 |发电技术论坛 2026 , 55 (4) : 140 -147
基于结渣因子监测与机器学习的水冷壁精准吹灰算法研究
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史建忠(1969),男,高级工程师,主要研究方向为发电厂运行、检修管理及技术创新,

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史建忠(1969),男,高级工程师,主要研究方向为发电厂运行、检修管理及技术创新,

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史建忠1 , 洪兵1, 温小豪2, 3, 施子福2, 3, 李培2, 3 , 周永刚2, 3
作者信息
  • 1.国能浙江宁海发电有限公司,浙江 宁波 315612
  • 2.浙江大学能源工程学院,浙江 杭州 310027
  • 3.浙江大学能源高效清洁利用全国重点实验室,浙江 杭州 310027
通讯作者:
李培(1986),男,博士,专职研究员,主要研究方向为锅炉智能化改造,
作者简介:

史建忠(1969),男,高级工程师,主要研究方向为发电厂运行、检修管理及技术创新,

Research on precise soot blowing algorithm for waterwall soot blowing based on slagging factor monitoring and machine learning
Jianzhong SHI1 , Bing HONG1, Xiaohao WEN2, 3, Zifu SHI2, 3, Pei LI2, 3 , Yonggang ZHOU2, 3
Affiliations
  • 1.CHN Energy Zhejiang Ninghai Power Generation Co., Ltd., Ningbo 315612, China
  • 2.College of Energy Engineering, Zhejiang University, Hangzhou 310027, China
  • 3.State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
出版时间: 2026-04-25 doi: 10.19666/j.rlfd.202507080
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【目的】

针对传统定时定量吹灰模式易导致水冷壁局部过吹、欠吹的问题,依托有效监测手段开展研究,旨在构建精准吹灰算法。

【方法】

利用新型水冷壁结渣监测传感器获取水冷壁炉内壁温,对比了3种机器学习方法构建水冷壁洁净状态下的理论炉内壁温模型,提出一种水冷壁结渣因子的计算方法,并据此构建精准吹灰算法,通过实际应用并与原定时定量吹灰模式进行对比,验证了该算法的优化效果。

【结果】

研究表明:随机森林回归方法建立的理论炉内壁温模型表现最佳,R2为0.92、δMSE为73.77、δMAPE为1.16%;精准吹灰算法实施后效果明显优于原定时定量吹灰模式,吹灰频次大幅度降低,且未造成水冷壁结渣状态恶化。

【结论】

该算法在保证锅炉运行安全性的前提下,有效降低了吹灰蒸汽消耗量,具有极高的工程应用价值。

机器学习  /  结渣监测  /  结渣因子  /  吹灰优化
[Objective]

Against the problem that the conventional timed and quantitative soot blowing mode is prone to cause local over-blowing and under-blowing of the waterwall, studies are carried out by relying on effective monitoring methods. As slag deposition on waterwall is a key factor affecting the safe and economic operation of thermal power boilers, long-term unresolved local over-blowing or under-blowing will not only accelerate the corrosion and wear of the waterwall, but also increase energy consumption and operational costs of power plants. Therefore, the core goal of this research is to establish a precise soot blowing algorithm to replace the conventional timed and quantitative soot blowing mode and realize adaptive and efficient soot blowing control.

[Methods]

A new type of waterwall slagging monitoring sensor was used to monitor the in-furnace waterwall surface temperature, which can collect real-time, continuous and high-precision temperature data to lay a reliable foundation for subsequent model construction. Three machine learning methods, including eXtreme gradient boosting (XGBoost), light gradient boosting machine (LightGBM) and random forest regression (RFR), were compared to construct theoretical in-furnace waterwall surface temperature models under clean waterwall conditions, and a calculation method for waterwall slagging factor was proposed. On this basis, a precise soot blowing algorithm was established. To verify the optimization effect of this algorithm, a 3-month practical application test was carried out in a 1 030 MW thermal power unit, and the operation data was compared with the original timed and quantitative soot blowing mode.

[Results]

The research shows that the theoretical in-furnace waterwall surface temperature model established by the random forest regression method performed the best, with an R2 of 0.92, δMSE of 73.77, and δMAPE of 1.16%. The implementation of the precise soot blowing algorithm is significantly better than the original quantitative soot blowing mode, with a significant reduction in soot blowing frequency and no deterioration of the waterwall slagging state, and the local maximum temperature of the waterwall is controlled within the safe range, avoiding the risk of tube explosion caused by overheating.

[Conclusion]

This algorithm reduces the consumption of soot blowing steam while ensuring the safety of boiler operation, which directly reduces the daily operation cost of the power plant. Moreover, the reduction of soot blowing frequency also reduces the influence of high-temperature steam on the waterwall, effectively extending the service life of the waterwall and reducing the maintenance cost of the boiler. It can be popularized and applied in thermal power plants of different capacities, and has extremely high application value.

machine learning  /  slag monitoring  /  slagging factor  /  soot blowing optimization
史建忠, 洪兵, 温小豪, 施子福, 李培, 周永刚. 基于结渣因子监测与机器学习的水冷壁精准吹灰算法研究. 热力发电, 2026 , 55 (4) : 140 -147 . DOI: 10.19666/j.rlfd.202507080
Jianzhong SHI, Bing HONG, Xiaohao WEN, Zifu SHI, Pei LI, Yonggang ZHOU. Research on precise soot blowing algorithm for waterwall soot blowing based on slagging factor monitoring and machine learning[J]. Thermal Power Generation, 2026 , 55 (4) : 140 -147 . DOI: 10.19666/j.rlfd.202507080
在“双碳”目标驱动下,我国煤电行业正通过燃料结构调整与运行方式优化实现低碳转型[1]。电厂燃用新疆高碱煤、掺烧生物质及污泥的多元化燃料策略,既是响应国家能源安全与循环经济政策的实践,也为降低碳排放提供了重要路径。然而,新疆煤因其碱金属含量高的特性,易在高温下粘附于水冷壁形成结渣[2];生物质与污泥中富含的钾、氯及重金属元素,会加剧灰渣粘结性[3]。与此同时,随着燃煤电厂调峰深度加大及频次增加,锅炉长期处于高低负荷频繁切换或持续低负荷运行状态,严重偏离其最佳运行工况。这一运行方式导致炉内热负荷分布不均,同样显著提升了水冷壁结渣风险[4]
水冷壁结渣会干扰锅炉正常传热过程,对运行安全性和经济性产生不利影响[5]。结渣会大幅降低受热面传热效率,导致炉膛出口烟温升高,增加排烟热损失,降低锅炉效率;同时,灰渣在管壁的附着会加剧高温腐蚀,加速管壁减薄,缩短设备寿命;此外,结渣可能引发局部超温,造成水冷壁管膨胀不均或水循环失效,严重时导致爆管事故[6];大渣块脱落还会冲击冷灰斗,可能引发二次燃烧或设备损坏。
目前针对水冷壁除渣最直接有效的方法是采用蒸汽吹灰[7]。由于缺乏有效的监测手段,大多数电厂仍采用定时定量的吹灰策略,该模式极易造成水冷壁局部区域出现欠吹或过吹的问题。针对该问题,国内外学者提出多种解决方案。徐力刚等[8]根据炉膛出口烟温建立了炉膛整体结渣监测模型;高峰等[9]通过水冷壁鳍片处热流密度的变化来监测结渣状态;针对掺烧新疆煤的锅炉,黄书益等[10]根据炉内火焰碱金属含量,对当前燃烧状态下的结渣趋势进行预判,为预防结渣和进行燃烧调整提供参考;Bilirgen[11]通过在锅炉上安装FEGT红外温度计监测炉膛出口温度来监测炉膛结渣程度;Taler等人[12]基于热流计实现水冷壁结渣在线监测;本文作者[13]设计了水冷壁结渣监测传感器,通过水冷壁向火侧壁温的变化监测传感器附近水冷壁的结渣量。在此基础上,深度学习方法通过挖掘锅炉运行大数据,可构建高精度的结渣状态软测量模型,如马晓春等[14]基于长短期记忆(LSTM)算法对结渣过程进行建模,开发水冷壁结渣监测模型;李孟威[15]、刘俊[16]、Dhanuskodi[17]、Teruel[18]、Peña等人[19]通过神经网络算法建立受热面污染状态监测模型,进而实现吹灰决策指导。
以上研究根据新型传感器、传热学原理或深度学习算法对水冷壁受热面污染状态进行监测,一定程度上改善了传统吹灰的盲目性,但未考虑锅炉工况变化对监测数据的影响。本文基于新型水冷壁结渣监测传感器,利用机器学习算法消除了锅炉运行工况对传感器数据的影响,并提出了以结渣因子为特征的精准吹灰算法,对每台吹灰器独立制定控制策略,为提升锅炉运行经济性、安全性提供了理论支撑与技术路径。
以国内某燃煤电厂1 030 MW超超临界直流锅炉水冷壁为研究对象。该锅炉主要设计参数见表1。水冷壁墙式吹灰器分布如图1所示,共有64台吹灰器,分为4层,由下至上编号为A1—A16、B1—B16、C1—C16、D1—D16。电厂原吹灰方式为定时定量吹灰,吹灰周期为48 h。
水冷壁结渣监测传感器如图2所示[20]。当水冷壁发生结渣时,结渣层增加了传热热阻,导致水冷壁实际吸热量减小,壁温降低,反之壁温升高。传感器监测数据如图3所示。在阶段2中,锅炉负荷基本稳定,水冷壁结渣状态监测传感器所测水冷壁向火侧壁温(炉内壁温)先呈下降趋势,当执行吹灰动作后,水冷壁炉内壁温突变上升约100 ℃,与传热学原理一致,表明采用的水冷壁结渣监测传感器可以直观反映水冷壁局部污染状态。除了上述吹灰动作的影响,水冷壁炉内壁温在阶段1及阶段3呈现随锅炉负荷的变化而变化的规律,表明水冷壁炉内壁温受锅炉运行参数影响较大。
为消除锅炉运行参数对水冷壁炉内壁温的影响,构建可量化表征表面结渣状态的数学模型。采用机器学习方法建立水冷壁洁净状态下的理论炉内壁温(tm)预测模型。为确定最合适的算法和参数,选用极限梯度提升(XGBoost)、轻量级梯度提升机(LightGBM)和随机森林回归(random forest regression,RFR)等3种机器学习算法进行建模,并对比计算结果。
建模的输入特征选择如下运行参数:给水流量(Qw)、给煤量(mc)、一次风量(Qp)、二次风量(Qs)、炉膛出口氧量(ϕO2)。并构造3个衍生特征:风煤比(Ra-c)、水煤比(Rw-c)和一二次风配比(Rp-s)。为降低特征冗余度,采用皮尔逊相关系数(Pearson correlation coefficient,PCC)分析特征间的线性关系,基于互信息(mutual information,MI)分析特征与炉内壁温的依赖关系,从而筛选关键特征。构造的Ra-cRw-cRp-s计算公式如下:
Rac=Qp+Qsmc
Rwc=Qwmc
Rps=QpQs
采集近3个月锅炉DCS运行数据,采样周期20 s,数据总量约39万。分析图3可知,吹灰后15 min内炉内壁温未下降,可认为水冷壁在该时段内仍处于洁净状态,因此取每次吹灰后15 min内的炉内壁温数据构建理论炉内壁温模型的建模数据库,其中80%为训练集,20%为测试集。训练完成后计算决定系数(R2)、均方误差(δMSE)和平均绝对百分比误差(δMAPE)评估模型,计算公式如下:
R2=1i=1n(yiy^i)2i=1n(yiy¯)2
δMSE=1ni=1n(yiy^i)2
δMAPE=1ni=1n|yiy^iyi|×100%
式中:yi为真实值;y^i为预测值;v¯为真实值的均值;n为样本数。
将实际炉内壁温归一化成无量纲常数,记作结渣因子Cp,其公式为:
Cp=1e3κ1e3
κ={tmtmax{tmiti|i=1,2,...,n}tmt0tmt
式中:t为实际炉内壁温,℃;tm为理论炉内壁温,℃。
从式(7)—式(8)可以看出,Cp越大表明炉内壁温越低,水冷壁结渣越严重。因此以Cp为特征构建每台吹灰器的精准吹灰算法,逻辑框架如图4所示。算法启动后读取锅炉运行数据及炉内壁温数据并计算Cp,若Cp大于临界值则输出吹灰需求信号,表示该处水冷壁需要吹灰;反之则等到下一分钟重新读取数据并计算Cp。每次吹灰执行后,根据吹灰后炉内壁温上升幅度(温升)修正Cp的临界值,若温升过低则上调临界值,反之下调。
输入特征分析结果如图5图6所示。由PCC矩阵可知mcQpQsϕO2均与Qw呈现强相关性;MI的结果表明,Qw是预测tm最关键的特征,且构造的3个衍生特征Ra-cRw-cRp-s相比原始运行参数mcQpQs等具有更高的依赖度。综上,删除共线性较强且依赖度较低的mcQpQs,用其他特征进行机器学习模型训练。
采用贝叶斯优化寻找3种机器学习模型的最优超参数组合,设初始采样点为10,迭代次数30,3种模型超参数搜索范围及最优值见表2表3对比了3种模型优化后的性能,其中RFR算法的R2最高、δMSEδMAPE最低,性能显著优于其他2种算法,故最终选用RFR算法进行tm建模。
在每台吹灰器附近的水冷壁上安装一个结渣监测传感器,获取每台吹灰器附近的水冷壁炉内壁温,并计算结渣因子Cp,结渣因子的变化特性如图7所示。阶段1中Cp呈指数级增长而后骤降,期间Cp最大值为0.89,该趋势表明水冷壁虽然结渣,但结渣较为疏松,在炉内空气动力场或重力的作用下会自行掉落;阶段2中,Cp同样先呈指数级增长,但当Cp>0.90后增长速度放缓,并稳定在0.98以上,可以认为此时水冷壁结渣不易掉落,需要吹灰干预。因此算法中Cp初始临界值设置为0.90。
选取吹灰优化前后各30天的数据进行分析,其中A层吹灰器吹灰温升对比情况如表4图8所示。传统吹灰模式的温升分布在9.8~216.7 ℃,数据离散度大,平均四分位距达67.05 ℃;精准吹灰模式实施后,平均值提升21.56 ℃,平均四分位距降低至23.69 ℃,较实施前降低了64.67%,数据更加集中。精准吹灰模式一方面通过减少非必要吹灰操作使吹灰温升最低值提升至60.60 ℃,另一方面增加了易结渣区域的吹灰频次,将水冷壁结渣程度控制在安全范围内。优化前后炉膛负压对比如图9所示。传统吹灰模式下曾多次出现掉渣引起的炉膛负压瞬时值[1]大于500 Pa的情况,而投运精准吹灰模式后负压明显更稳定,炉膛负压瞬时最大值仅在200 Pa左右。
吹灰优化前后炉膛的吹灰频次对比结果见表5。优化后共计吹灰574次,日均吹灰19.13次,较优化前降低约40.22%。
本文采用新型水冷壁结渣监测传感器获取水冷壁炉内壁温,并基于机器学习方法建立了理论炉内壁温模型,进而构建精准吹灰算法,并与传统定时定量吹灰策略进行对比分析,主要结论如下。
1)通过PCC和MI联合分析方法,揭示了给水流量在炉内壁温预测中的主导作用,同时发现风煤比、水煤比与一二次风配比等衍生特征相比原始运行参数具有更高的信息量。基于随机森林回归构建的理论壁温模型具有更高的精度和鲁棒性,经贝叶斯优化后其性能指标(R2=0.92,δMSE=73.77,δMAPE=1.16%)显著优于XGBoost和LightGBM模型。
2)基于理论炉内壁温构建的结渣因子Cp能够反映结渣的不同状态,若Cp呈指数级增长后骤降,表明水冷壁结渣较为疏松,可以自行掉落;若Cp增长速度减缓并稳定在0.98以上,则认为水冷壁结渣不易掉落,需要吹灰干预。
3)将精准吹灰算法与传统定时定量吹灰模式进行对比,结果表明吹灰优化后吹灰温升最低值从9.8 ℃提升至60.60 ℃,平均值提升21.56 ℃,平均四分位距降低至23.69 ℃,较实施前降低64.67%,大幅减少了无效吹灰次数;日均吹灰频次从32.00次/日降低至19.13次/日,降低约40.22%,显著提升吹灰经济性及机组安全性。
  • 能源高效清洁利用全国重点实验室自主课题(ZJUCEU2025012)
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2026年第55卷第4期
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doi: 10.19666/j.rlfd.202507080
  • 接收时间:2025-07-29
  • 首发时间:2026-08-14
  • 出版时间:2026-04-25
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  • 收稿日期:2025-07-29
  • 修回日期:2025-09-07
  • 录用日期:2025-09-16
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Independent Project of State Key Laboratory of Energy Efficient and Clean Utilization(ZJUCEU2025012)
能源高效清洁利用全国重点实验室自主课题(ZJUCEU2025012)
作者信息
    1.国能浙江宁海发电有限公司,浙江 宁波 315612
    2.浙江大学能源工程学院,浙江 杭州 310027
    3.浙江大学能源高效清洁利用全国重点实验室,浙江 杭州 310027

通讯作者:

李培(1986),男,博士,专职研究员,主要研究方向为锅炉智能化改造,
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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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