Article(id=1215700942377374238, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1215700941538509036, articleNumber=null, orderNo=null, doi=10.19666/j.rlfd.202401012, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1705852800000, receivedDateStr=2024-01-22, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1767775291294, onlineDateStr=2026-01-07, pubDate=1721836800000, pubDateStr=2024-07-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1767775291294, onlineIssueDateStr=2026-01-07, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1767775291294, creator=13701087609, updateTime=1767775291294, updator=13701087609, issue=Issue{id=1215700941538509036, tenantId=1146029695717560320, journalId=1210938733613449225, year='2024', volume='53', issue='7', pageStart='1', pageEnd='158', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1767775291094, creator=13701087609, updateTime=1767775458121, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1215701642159243949, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1215700941538509036, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1215701642159243950, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1215700941538509036, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=119, endPage=128, ext={EN=ArticleExt(id=1215700942612255263, articleId=1215700942377374238, tenantId=1146029695717560320, journalId=1210938733613449225, language=EN, title=Interpretable prediction model for NO
x mass concentration at SCR reactor inlet in coal-fired power plants under flexible operating conditions, columnId=1211002405299294959, journalTitle=Thermal Power Generation, columnName=Thermal energy science research, runingTitle=null, highlight=null, articleAbstract=
There is a delay in NOx measurement for flexible operations in coal-fired power plants, which leads to a delayed response in ammonia injection control system of selective catalytic reduction (SCR) reactor, resulting in potential over or under-injection of ammonia and significant fluctuations in NOx mass concentration at outlet of the SCR reactor. To enable proactive adjustment of ammonia injection and considering the interconnected factors influencing the NOx emissions from coal combustion, a prediction model for NOx mass concentration at the SCR reactor inlet is proposed based on convolutional neural networks (CNNs) and long short-term memory neural (LSTM) networks. By using operational parameters from a 330 MW coal-fired power plant, a Pearson coefficient method is employed to calculate the correlation between feature variables. Significant features are extracted to define the model input matrix and output matrix. The random search algorithm is used for hyper-parameters optimization to enhance predictive performance. The SHAP algorithm is then applied to interpret the model structure and explain the black-box model. Finally, the control effects of model with NOx concentration prediction is verified through Simulink simulation. The results indicate that, the CNN-LSTM prediction model demonstrates higher predictive accuracy for the variable NOx mass concentration at the SCR reactor inlet during the frequent load fluctuations. It can provide feedback to the ammonia injection control system of 25 seconds in advance. The optimized ammonia injection control strategy not only reduces the standard deviation between the NOx mass concentration at the SCR reactor outlet and the set value by 28%, but also improves the response speed of NH3/NOx regulation, reducing the maximum ammonia slip by 22%. The research findings can provide guidance for intelligent SCR denitration system and combustion optimizing operating during flexible operation of coal-fired power plants.
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x质量浓度预测模型, columnId=1211002405437706993, journalTitle=热力发电, columnName=热能科学研究, runingTitle=null, highlight=null, articleAbstract=
燃煤电厂灵活调峰过程NOx测量往往存在滞后现象,导致选择性催化还原(selective satalytic reduction,SCR)脱硝喷氨控制系统响应不及时,易造成喷氨量过高或过低,从而造成SCR反应器出口NOx质量浓度波动剧烈和氨逃逸率增大。为实现喷氨阀门的提前快速调节并考虑影响燃煤锅炉NOx排放量的因素存在耦合性,提出了一种基于卷积神经网络(convolutional neural network,CNN)和长短时记忆(long short-term memory,LSTM)神经网络混合模型的SCR反应器入口NOx预测模型。利用一台330 MW燃煤电站锅炉的运行参数,通过Pearson系数法计算特征变量之间的相关性,筛选出相关性较大的特征,并定义模型的输入矩阵和输出矩阵,采用随机搜索算法进行优化,以提高预测性能。进一步利用SHAP算法对黑箱模型进行解释,并通过Simulink仿真验证了带有NOx预测的控制效果。结果表明:CNN-LSTM预测模型在调峰负荷变化时,能够以较高的精度预测SCR反应器入口NOx质量浓度的变化,并能提前25 s为喷氨控制系统提供反馈;优化后的喷氨控制策略降低了出口NOx质量浓度与设定值间的标准差(降低28%),并提升了NH3/NOx的响应速度,减小最大氨逃逸量22%。该研究结果可为灵活调峰机组的智慧SCR脱硝技术及燃烧优化提出有效的指导。
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1.新疆大学电气工程学院,新疆 乌鲁木齐 830046, bio={"content":"
李影(1999),女,硕士研究生,主要研究方向为智慧电厂污染物控制等,3214650576@qq.com。
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李影(1999),女,硕士研究生,主要研究方向为智慧电厂污染物控制等,3214650576@qq.com。
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2008(1): 142-146., articleTitle=Operation analysis of flue gas denitrification reactors with selective catalytic reduction under variable working conditions, refAbstract=null)], funds=[Fund(id=1215700958185705658, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, awardId=2023A01005-1, language=EN, fundingSource=Provincial Major Scientific and Technological Special Project(2023A01005-1), fundOrder=null, country=null), Fund(id=1215700958294757567, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, awardId=2023A01005-1, language=CN, fundingSource=自治区重大科技专项项目(2023A01005-1), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1215700947523785335, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, xref=1., ext=[AuthorCompanyExt(id=1215700947527979639, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, companyId=1215700947523785335, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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Predictive algorithm process for NO mass concentration at the SCR reactor inlet , figureFileSmall=a5KgrB2+wPv0h4K7j3CUoA==, figureFileBig=Mcr3DrEHadqVUmX6oYs5YA==, tableContent=null), ArticleFig(id=1215700951961359176, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=CN, label=图1, caption=
预测SCR反应器入口NO质量浓度算法流程, figureFileSmall=a5KgrB2+wPv0h4K7j3CUoA==, figureFileBig=Mcr3DrEHadqVUmX6oYs5YA==, tableContent=null), ArticleFig(id=1215700952246571866, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=EN, label=Fig.2, caption=
The heatmap of steady load correlation variables, figureFileSmall=J1ANH1vWxD85NZcdEWdrKw==, figureFileBig=OlYm1UBye2o0KdKGgkAB+Q==, tableContent=null), ArticleFig(id=1215700952426926948, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=CN, label=图2, caption=
稳定负荷相关变量热力图, figureFileSmall=J1ANH1vWxD85NZcdEWdrKw==, figureFileBig=OlYm1UBye2o0KdKGgkAB+Q==, tableContent=null), ArticleFig(id=1215700952544367471, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=EN, label=Fig.3, caption=
The heatmap of variable load correlation variables, figureFileSmall=4mtUVrgGg3/bTrn10C7TkQ==, figureFileBig=pJ233RNhkfXdb7101JdITg==, tableContent=null), ArticleFig(id=1215700952661807990, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=CN, label=图3, caption=
变负荷相关变量热力图, figureFileSmall=4mtUVrgGg3/bTrn10C7TkQ==, figureFileBig=pJ233RNhkfXdb7101JdITg==, tableContent=null), ArticleFig(id=1215700952770859907, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=EN, label=Fig.4, caption=
Feature variable groups , figureFileSmall=k9tONOjEcX+PQgMqQ3+hcQ==, figureFileBig=tLhhiBWuXH/qtlx+s84pNw==, tableContent=null), ArticleFig(id=1215700952896689040, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=CN, label=图4, caption=
特征变量分组, figureFileSmall=k9tONOjEcX+PQgMqQ3+hcQ==, figureFileBig=tLhhiBWuXH/qtlx+s84pNw==, tableContent=null), ArticleFig(id=1215700953043489695, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=EN, label=Fig.5, caption=
Comparison between the predicted values and the actual values, figureFileSmall=0iYCiqpN8Ed4HAVcc6SgEA==, figureFileBig=7rruW236OZ38sSGBYl2QOg==, tableContent=null), ArticleFig(id=1215700953202873257, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=CN, label=图5, caption=
预测值与测量值对比, figureFileSmall=0iYCiqpN8Ed4HAVcc6SgEA==, figureFileBig=7rruW236OZ38sSGBYl2QOg==, tableContent=null), ArticleFig(id=1215700953295147952, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=EN, label=Fig.6, caption=
Relationship between load variations and prediction errors, figureFileSmall=18FOYLiojvZEXWWf5J8ddQ==, figureFileBig=2RI92u9E42GZQnsEiM797g==, tableContent=null), ArticleFig(id=1215700953391616951, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=CN, label=图6, caption=
负荷变化与预测误差的关系, figureFileSmall=18FOYLiojvZEXWWf5J8ddQ==, figureFileBig=2RI92u9E42GZQnsEiM797g==, tableContent=null), ArticleFig(id=1215700953488085951, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=EN, label=Fig.7, caption=
Comparison between the predicted values and actual values for peaks under operating condition 2, figureFileSmall=0dZqCaYirBj5LplWc8qr1g==, figureFileBig=/veGflq82M/PRtQxT7GDjQ==, tableContent=null), ArticleFig(id=1215700953622303691, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=CN, label=图7, caption=
工况2波峰预测值和测量值对比, figureFileSmall=0dZqCaYirBj5LplWc8qr1g==, figureFileBig=/veGflq82M/PRtQxT7GDjQ==, tableContent=null), ArticleFig(id=1215700953710384086, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=EN, label=Fig.8, caption=
The variation of operating condition 5 after modification, figureFileSmall=h2b0vINaRqtUVLI4Eghqog==, figureFileBig=56+QgG7ynphBoeDBslC1Nw==, tableContent=null), ArticleFig(id=1215700954578605025, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=CN, label=图8, caption=
修正后工况5变化, figureFileSmall=h2b0vINaRqtUVLI4Eghqog==, figureFileBig=56+QgG7ynphBoeDBslC1Nw==, tableContent=null), ArticleFig(id=1215700954670879722, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=EN, label=Fig.9, caption=
The load variation data after correction, figureFileSmall=y/sTV6UUdyCrlYsWAZb9Ng==, figureFileBig=z6WTNZItp731UxjlZNSJVQ==, tableContent=null), ArticleFig(id=1215700954746377199, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=CN, label=图9, caption=
变负荷数据修正后, figureFileSmall=y/sTV6UUdyCrlYsWAZb9Ng==, figureFileBig=z6WTNZItp731UxjlZNSJVQ==, tableContent=null), ArticleFig(id=1215700954842846200, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=EN, label=Fig.10, caption=
The variable load data, figureFileSmall=pxvlohUsJ619JmKZZhSCkQ==, figureFileBig=YYy5cUdAmCyPdw108uM11g==, tableContent=null), ArticleFig(id=1215700954956092414, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=CN, label=图10, caption=
变负荷数据, figureFileSmall=pxvlohUsJ619JmKZZhSCkQ==, figureFileBig=YYy5cUdAmCyPdw108uM11g==, tableContent=null), ArticleFig(id=1215700955077726208, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=EN, label=Fig.11, caption=
The steady load feature importance plot, figureFileSmall=t9BCaTsEDd1hDAnYji2c+w==, figureFileBig=wehTxDplkkP7jAr5ZSFEZw==, tableContent=null), ArticleFig(id=1215700955211943944, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=CN, label=图11, caption=
稳定负荷特征VI图, figureFileSmall=t9BCaTsEDd1hDAnYji2c+w==, figureFileBig=wehTxDplkkP7jAr5ZSFEZw==, tableContent=null), ArticleFig(id=1215700955295830029, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=EN, label=Fig.12, caption=
The steady load of summary plot, figureFileSmall=zRorzOlikNQ1LRZ7pLrUWQ==, figureFileBig=PmSu7ehYq+jzh7JCQGGvGQ==, tableContent=null), ArticleFig(id=1215700955379716115, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=CN, label=图12, caption=
稳定负荷概要, figureFileSmall=zRorzOlikNQ1LRZ7pLrUWQ==, figureFileBig=PmSu7ehYq+jzh7JCQGGvGQ==, tableContent=null), ArticleFig(id=1215700955476185115, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=EN, label=Fig.13, caption=
The variable load-state of summary plot, figureFileSmall=P9JBtzzUxif2nhfpmQeTsQ==, figureFileBig=3ZqfptMMd+ah7Rqfv0JaJQ==, tableContent=null), ArticleFig(id=1215700955585237022, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=CN, label=图13, caption=
变负荷概要, figureFileSmall=P9JBtzzUxif2nhfpmQeTsQ==, figureFileBig=3ZqfptMMd+ah7Rqfv0JaJQ==, tableContent=null), ArticleFig(id=1215700955723649065, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=EN, label=Fig.14, caption=
The combined effect of the baffle opening of the secondary air damper and total airflow, figureFileSmall=Xvhs8gNXrDgO3IqN3T5vfw==, figureFileBig=8V/V7rh9PFrHdvRWwZLztQ==, tableContent=null), ArticleFig(id=1215700955832700977, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=CN, label=图14, caption=
二次风挡板开度和总风量共同影响, figureFileSmall=Xvhs8gNXrDgO3IqN3T5vfw==, figureFileBig=8V/V7rh9PFrHdvRWwZLztQ==, tableContent=null), ArticleFig(id=1215700955924975671, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=EN, label=Fig.15, caption=
The combined effect of temperature at the SCR reactor inlet A and total airflow, figureFileSmall=wuzU2jLCE1rSrWXb8FfEYQ==, figureFileBig=XS1f2zVp6P0IIeehZBP4lg==, tableContent=null), ArticleFig(id=1215700956071776317, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=CN, label=图15, caption=
SCR反应器入口A温度和总风量共同影响, figureFileSmall=wuzU2jLCE1rSrWXb8FfEYQ==, figureFileBig=XS1f2zVp6P0IIeehZBP4lg==, tableContent=null), ArticleFig(id=1215700956185022532, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=EN, label=Fig.16, caption=
Framework of the intelligent predictive feedforward control strategy for SCR denitrification, figureFileSmall=pyoRdLqtq/CyXm9ugdNyoQ==, figureFileBig=iayOsqf62deWGhA3VwpSow==, tableContent=null), ArticleFig(id=1215700956285685834, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=CN, label=图16, caption=
SCR脱硝智能预测前馈控制策略框图, figureFileSmall=pyoRdLqtq/CyXm9ugdNyoQ==, figureFileBig=iayOsqf62deWGhA3VwpSow==, tableContent=null), ArticleFig(id=1215700956411514962, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=EN, label=Fig.17, caption=
The results of NH3/NO with and without feedforward control during load variation, figureFileSmall=JGC03wy4zWchA+cXYzIm3w==, figureFileBig=NSC6StCi//A524N/wIMToQ==, tableContent=null), ArticleFig(id=1215700956533149786, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=CN, label=图17, caption=
变负荷时有无前馈控制NH3/NO结果, figureFileSmall=JGC03wy4zWchA+cXYzIm3w==, figureFileBig=NSC6StCi//A524N/wIMToQ==, tableContent=null), ArticleFig(id=1215700956591870048, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=EN, label=Fig.18, caption=
The simulated NOx mass concentrations at the outlet, figureFileSmall=nL+fzF4ZrULyjM10lvJT+Q==, figureFileBig=+wT0cPfEhTg0bLg5egF76A==, tableContent=null), ArticleFig(id=1215700956692533349, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=CN, label=图18, caption=
出口NOx质量浓度仿真结果对比, figureFileSmall=nL+fzF4ZrULyjM10lvJT+Q==, figureFileBig=+wT0cPfEhTg0bLg5egF76A==, tableContent=null), ArticleFig(id=1215700956784808040, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=EN, label=Fig.19, caption=
The simulated ammonia slip at the outlet, figureFileSmall=JYxZjoLFgHNb/4HsWmu6JQ==, figureFileBig=yAZ1R8g1JMHkMv7aLcaLjg==, tableContent=null), ArticleFig(id=1215700956860305517, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=CN, label=图19, caption=
出口氨逃逸仿真结果对比, figureFileSmall=JYxZjoLFgHNb/4HsWmu6JQ==, figureFileBig=yAZ1R8g1JMHkMv7aLcaLjg==, tableContent=null), ArticleFig(id=1215700956939997300, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=EN, label=Tab.1, caption=
The characteristic variables of the studied unit under operating conditions
, figureFileSmall=null, figureFileBig=null, tableContent=
| 变量 | 标签 |
|---|
| 总风量/(t·h–1) | Air Flow |
| 总给煤量/(t·h–1) | Coal |
| 选择后发电机有功功率/MW | Load |
| A磨入口风量/(t·h–1) | A_air |
| B磨入口风量/(t·h–1) | B_air |
| C磨入口风量/(t·h–1) | C_air |
| D磨入口风量/(t·h–1) | D_air |
| 烟气侧省煤器入口温度/℃ | Economizer_T |
| 省煤器入口烟气温度(左侧)/℃ | Economizer_T_left |
| 汽轮机入口蒸汽压力/MPa | Steam pressure |
| 主蒸汽流量/(t·h–1) | Steam mass flow |
| 5号低加抽汽压力/MPa | NO.5 pressure |
| A空预器入口氧量/% | Air preheater_O2 |
| A一次风风机电流/A | A_Primary airflow |
| B一次风风机电流/A | B_Primary airflow |
| 二次风挡板开度/% | Baffle opening |
| SCR反应器B入口烟气温度/℃ | SCR_B_T |
| SCR反应器B入口O2体积分数/% | SCR_B_O2 |
| SCR反应器B烟气流量/(t·h–1) | SCR_B_Flue_gas_Flow |
| SCR反应器B氨气流量/(t·h–1) | B_NH3 |
| SCR反应器A入口烟气温度/℃ | SCR_A_T |
| SCR反应器A入口O2体积分数/% | SCR_A_O2 |
| SCR反应器A烟气流量/(t·h–1) | SCR_A_Flue_gas_Flow |
| SCR反应器A氨气流量/(t·h–1) | A_NH3 |
| SCR反应器A入口烟气压力/MPa | SCR_A_pressure |
| SCR反应器A入口NO质量浓度/(mg·m–3) | SCR_A_NO |
), ArticleFig(id=1215700957040660601, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=CN, label=表1, caption=
运行条件下研究机组的特征变量
, figureFileSmall=null, figureFileBig=null, tableContent=
| 变量 | 标签 |
|---|
| 总风量/(t·h–1) | Air Flow |
| 总给煤量/(t·h–1) | Coal |
| 选择后发电机有功功率/MW | Load |
| A磨入口风量/(t·h–1) | A_air |
| B磨入口风量/(t·h–1) | B_air |
| C磨入口风量/(t·h–1) | C_air |
| D磨入口风量/(t·h–1) | D_air |
| 烟气侧省煤器入口温度/℃ | Economizer_T |
| 省煤器入口烟气温度(左侧)/℃ | Economizer_T_left |
| 汽轮机入口蒸汽压力/MPa | Steam pressure |
| 主蒸汽流量/(t·h–1) | Steam mass flow |
| 5号低加抽汽压力/MPa | NO.5 pressure |
| A空预器入口氧量/% | Air preheater_O2 |
| A一次风风机电流/A | A_Primary airflow |
| B一次风风机电流/A | B_Primary airflow |
| 二次风挡板开度/% | Baffle opening |
| SCR反应器B入口烟气温度/℃ | SCR_B_T |
| SCR反应器B入口O2体积分数/% | SCR_B_O2 |
| SCR反应器B烟气流量/(t·h–1) | SCR_B_Flue_gas_Flow |
| SCR反应器B氨气流量/(t·h–1) | B_NH3 |
| SCR反应器A入口烟气温度/℃ | SCR_A_T |
| SCR反应器A入口O2体积分数/% | SCR_A_O2 |
| SCR反应器A烟气流量/(t·h–1) | SCR_A_Flue_gas_Flow |
| SCR反应器A氨气流量/(t·h–1) | A_NH3 |
| SCR反应器A入口烟气压力/MPa | SCR_A_pressure |
| SCR反应器A入口NO质量浓度/(mg·m–3) | SCR_A_NO |
), ArticleFig(id=1215700957170684033, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=EN, label=Tab.2, caption=
Comparison of predictive results for three sets of feature variables
, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | Group1 (相关系数>0.7) | Group2 (相关系数>0.4) | Group3 (经验选取) |
|---|
| δRMSE/(mg·m–3) | 22.65 | 18.59 | 30.11 |
| R2 | 0.84 | 0.87 | 0.79 |
| PFC | 0.34 | 0.50 | 0.30 |
), ArticleFig(id=1215700957267153030, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=CN, label=表2, caption=
3组特征变量预测结果对比
, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | Group1 (相关系数>0.7) | Group2 (相关系数>0.4) | Group3 (经验选取) |
|---|
| δRMSE/(mg·m–3) | 22.65 | 18.59 | 30.11 |
| R2 | 0.84 | 0.87 | 0.79 |
| PFC | 0.34 | 0.50 | 0.30 |
), ArticleFig(id=1215700957367816330, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=EN, label=Tab.3, caption=
Optimization results of hyper parameters of the CNN-LSTM model
, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | 设置 |
|---|
| 卷积层Conv | 卷积核数量(filters),尺寸(Kernel Size=2),卷积步长(Strides=1) |
| 最大池化层MaxPooling | 池化窗口的尺寸(Pool size=2),池化层步长(Strides=1) |
| LSTM | LSTM神经元数量(units),激活函数(Activation=relu) |
| 全连接层Dense | 神经元数量(units=4) |
| 优化器 | Adam |
| 学习率 | learning_rate=0.001 |
| epoch | 100 |
| dropout | 0.3 |
| batch_size | 512 |
), ArticleFig(id=1215700957485256851, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=CN, label=表3, caption=
CNN-LSTM模型超参数优化结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | 设置 |
|---|
| 卷积层Conv | 卷积核数量(filters),尺寸(Kernel Size=2),卷积步长(Strides=1) |
| 最大池化层MaxPooling | 池化窗口的尺寸(Pool size=2),池化层步长(Strides=1) |
| LSTM | LSTM神经元数量(units),激活函数(Activation=relu) |
| 全连接层Dense | 神经元数量(units=4) |
| 优化器 | Adam |
| 学习率 | learning_rate=0.001 |
| epoch | 100 |
| dropout | 0.3 |
| batch_size | 512 |
), ArticleFig(id=1215700957581725847, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=EN, label=Tab.4, caption=
The prediction results under different operating conditions
, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | 工况1 | 工况2 | 工况3 | 工况4 |
|---|
| δRMSE/(mg·m–3) | 15.880 | 20.544 | 5.410 | 30.250 |
| R2 | 0.90 | 0.87 | 0.95 | 0.75 |
| PFC | 0.56 | 0.9 | 0.83 | 0.41 |
), ArticleFig(id=1215700957661417627, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=CN, label=表4, caption=
工况对比预测结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | 工况1 | 工况2 | 工况3 | 工况4 |
|---|
| δRMSE/(mg·m–3) | 15.880 | 20.544 | 5.410 | 30.250 |
| R2 | 0.90 | 0.87 | 0.95 | 0.75 |
| PFC | 0.56 | 0.9 | 0.83 | 0.41 |
), ArticleFig(id=1215700957736915104, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=EN, label=Tab.5, caption=
The comparison of predicted results for variable operating load
, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | 工况6 | 工况4 | 工况5 |
|---|
| δRMSE/(mg·m–3) | 18.12 | 30.25 | 10.52 |
| R2 | 0.82 | 0.75 | 0.95 |
| PFC | 0.51 | 0.41 | 0.65 |
), ArticleFig(id=1215700957904687271, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=CN, label=表5, caption=
变负荷对比预测结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | 工况6 | 工况4 | 工况5 |
|---|
| δRMSE/(mg·m–3) | 18.12 | 30.25 | 10.52 |
| R2 | 0.82 | 0.75 | 0.95 |
| PFC | 0.51 | 0.41 | 0.65 |
), ArticleFig(id=1215700957996961964, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=EN, label=Tab.6, caption=
Optimization indexes with and without feedforward
, figureFileSmall=null, figureFileBig=null, tableContent=
| 无前馈控制 | 有前馈控制 |
|---|
| SCR反应器出口NOx质量浓度平均值/(mg·m–3) | 40.004 1 | 40.002 3 |
| SCR反应器出口NOx质量浓度标准差/(mg·m–3) | 0.145 7 | 0.104 0 |
| SCR反应器出口NOx质量浓度波动/(mg·m–3) | 0.3 | 0.2 |
| 平均氨逃逸量/(μL·L–1) | 2.13 | 1.65 |
), ArticleFig(id=1215700958080848047, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700942377374238, language=CN, label=表6, caption=
有无前馈控制优化指标
, figureFileSmall=null, figureFileBig=null, tableContent=
| 无前馈控制 | 有前馈控制 |
|---|
| SCR反应器出口NOx质量浓度平均值/(mg·m–3) | 40.004 1 | 40.002 3 |
| SCR反应器出口NOx质量浓度标准差/(mg·m–3) | 0.145 7 | 0.104 0 |
| SCR反应器出口NOx质量浓度波动/(mg·m–3) | 0.3 | 0.2 |
| 平均氨逃逸量/(μL·L–1) | 2.13 | 1.65 |
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