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In view of the problems that conventional fly ash carbon content prediction models are prone to fall into local optimal solution traps and have insufficient generalization ability, based on the boiler hot-state multi-condition tests, 28 key characteristic parameters are selected through data collection, processing, Pearson correlation analysis of variables, and importance ranking, the sparrow search algorithm (SSA) is used to determine the optimal hyper-parameters of the random forest (RF) model, and an SSA-RF prediction model is constructed. The model verification results show that the root-mean-square error of the SSA-RF model in the training set and the test set decreases to 0.010 8 and 0.019 1 respectively, and the coefficient of determination R2 increases to 0.999 7 and 0.998 1 respectively, demonstrating the excellent prediction accuracy and generalization ability of the model. Furthermore, the ISSA-RF-SSA algorithm is proposed. The SSA is improved by integrating multiple strategies to achieve global extreme value optimization of combustion parameters. Engineering verification shows that after optimization, the carbon content in fly ash decreased from 2.500% to 1.345%, and the prediction error was only 0.003 percentage points, verifying the accuracy of the model. The research results indicate that the ISSA-RF-SSA method improved by multiple strategies significantly enhances the optimization performance of the algorithm, providing a new idea for the combustion optimization of coal-fired units.
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针对传统飞灰含碳量预测模型存在局部最优解陷阱和泛化能力不足的问题,在锅炉热态多工况试验的基础上,经数据采集、处理以及变量Pearson相关性分析和重要度排序筛选出28个关键特征参数,采用麻雀搜索算法(sparrow search algorithm,SSA)确定随机森林(random forest,RF)模型最优超参数,构建SSA-RF预测模型。模型验证结果表明:SSA-RF模型在训练集和测试集的均方根误差分别降至0.010 8和0.019 1,决定系数R2提升至0.999 7和0.998 1,显示模型优异的预测准确性和泛化能力。进一步提出ISSA-RF-SSA算法,融合多种策略改进SSA,实现燃烧参数的全局极值寻优。工程验证显示,ISSA-RF-SSA算法预测飞灰含碳量与实际值误差为0.03百分点,该算法优化后锅炉实际飞灰含碳量由2.500%降至1.345%。研究结果表明,通过多策略改进的ISSA-RF-SSA方法显著提升了算法的寻优性能,为燃煤机组燃烧优化提供了新思路。
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Flowchart of the SSA-RF fly ash carbon content prediction model, figureFileSmall=FnF9WoreElRL7WXVIdLZMg==, figureFileBig=M+057WMBG6/uw9HrQ/5ZUQ==, tableContent=null), ArticleFig(id=1217836127428464815, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836120189096822, language=CN, label=图1, caption=
SSA-RF飞灰含碳量预测模型流程, figureFileSmall=FnF9WoreElRL7WXVIdLZMg==, figureFileBig=M+057WMBG6/uw9HrQ/5ZUQ==, tableContent=null), ArticleFig(id=1217836127642374332, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836120189096822, language=EN, label=Fig.2, caption=
Correlation coefficients of the initial variables, figureFileSmall=zKPijMfhSonNFyB0FxnV2w==, figureFileBig=9v3cthBM/awh4weEeF1vtQ==, tableContent=null), ArticleFig(id=1217836127730454722, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836120189096822, language=CN, label=图2, caption=
初始变量的相关系数, figureFileSmall=zKPijMfhSonNFyB0FxnV2w==, figureFileBig=9v3cthBM/awh4weEeF1vtQ==, tableContent=null), ArticleFig(id=1217836127864672457, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836120189096822, language=EN, label=Fig.3, caption=
The importance ranking of the initial variables, figureFileSmall=/IDAQ3bZ27AT2lh6bbXhMA==, figureFileBig=WQB23WodxPM5gaOFacwoXQ==, tableContent=null), ArticleFig(id=1217836127961141453, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836120189096822, language=CN, label=图3, caption=
初始变量重要性排序, figureFileSmall=/IDAQ3bZ27AT2lh6bbXhMA==, figureFileBig=WQB23WodxPM5gaOFacwoXQ==, tableContent=null), ArticleFig(id=1217836128112136403, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836120189096822, language=EN, label=Fig.4, caption=
Variations of δMSE and R2 with the number of features, figureFileSmall=k8JJlcemXagp6Pun+GHtBA==, figureFileBig=96zW2I4n7ySvKPOvnrW6FA==, tableContent=null), ArticleFig(id=1217836128208605398, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836120189096822, language=CN, label=图4, caption=
δRMSE和R2随特征数量变化, figureFileSmall=k8JJlcemXagp6Pun+GHtBA==, figureFileBig=96zW2I4n7ySvKPOvnrW6FA==, tableContent=null), ArticleFig(id=1217836128275714267, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836120189096822, language=EN, label=Fig.5, caption=
Comparison of true values and predicted values in the test set across multiple models, figureFileSmall=DGgngYadp2G0WUVlbWfS5A==, figureFileBig=oHS4iQzA/CnpiInleXHM8g==, tableContent=null), ArticleFig(id=1217836128351211744, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836120189096822, language=CN, label=图5, caption=
多模型测试集真实值和预测值结果对比, figureFileSmall=DGgngYadp2G0WUVlbWfS5A==, figureFileBig=oHS4iQzA/CnpiInleXHM8g==, tableContent=null), ArticleFig(id=1217836128439292133, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836120189096822, language=EN, label=Fig.6, caption=
Comparison of optimization results between ISSA-RF-SSA and SSA-RF-SSA, figureFileSmall=biIOU6S4kMceFafJwzdm6w==, figureFileBig=B4O5sBL0CXBDlFaNMx9NvA==, tableContent=null), ArticleFig(id=1217836128514789613, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836120189096822, language=CN, label=图6, caption=
ISSA-RF-SSA与SSA-RF-SSA寻优结果对比, figureFileSmall=biIOU6S4kMceFafJwzdm6w==, figureFileBig=B4O5sBL0CXBDlFaNMx9NvA==, tableContent=null), ArticleFig(id=1217836128632230129, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836120189096822, language=EN, label=Tab.1, caption=
Hot state test conditions and results for the boiler
, figureFileSmall=null, figureFileBig=null, tableContent=
| 工况 | 试验日期 | 试验时段 | 工况说明 | 飞灰含碳量/% |
|---|
| T01 | 2024-10-24 | 14:00—16:00 | 摸底试验 | 2.50 |
| T02 | 2024-10-29 | 09:40—10:10 | 变氧量试验(中氧量) | 1.88 |
| T03 | 2024-10-29 | 10:30—11:00 | 变氧量试验(大氧量) | 2.23 |
| T04 | 2024-10-29 | 11:25—11:55 | 变氧量试验(小氧量) | 2.66 |
| T05 | 2024-10-29 | 15:20—15:50 | 变二次风工况 | 2.15 |
| T06 | 2024-10-29 | 16:15—16:45 | 变燃尽风工况 | 2.39 |
| T07 | 2024-10-30 | 10:10—10:40 | 变一次风速工况 | 2.21 |
| T08 | 2024-10-30 | 11:00—11:30 | 变AA风工况 | 2.42 |
| T09 | 2024-10-30 | 13:40—14:10 | 变燃尽风工况 | 1.43 |
| T10 | 2024-10-30 | 14:30—15:00 | 变分离器转速工况 | 1.32 |
| T11 | 2024-10-31 | 15:30—6:00 | 变燃尽风左右摆角工况 | 1.89 |
| T12 | 2024-11-01 | 10:15—11:00 | 变上煤方式 | 2.90 |
| T13 | 2024-11-01 | 15:00—15:45 | 变上煤方式优化 | 1.96 |
| T14 | 2024-11-02 | 10:40—11:20 | 变磨组合方式工况(A、B、C磨) | 2.46 |
| T15 | 2024-11-02 | 13:05—13:35 | 三磨组合变氧量试验(小氧量) | 2.76 |
| T16 | 2024-11-02 | 13:55—14:25 | 三磨组合变氧量试验(大氧量) | 2.46 |
| T17 | 2024-11-02 | 15:00—15:30 | 变磨组合优化工况(ABC磨) | 2.02 |
| T18 | 2024-11-04 | 10:30—11:10 | 优化工况1 | 1.64 |
| T19 | 2024-11-04 | 11:30—12:00 | 优化工况2 | 1.28 |
), ArticleFig(id=1217836128745476343, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836120189096822, language=CN, label=表1, caption=
锅炉热态试验工况及结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| 工况 | 试验日期 | 试验时段 | 工况说明 | 飞灰含碳量/% |
|---|
| T01 | 2024-10-24 | 14:00—16:00 | 摸底试验 | 2.50 |
| T02 | 2024-10-29 | 09:40—10:10 | 变氧量试验(中氧量) | 1.88 |
| T03 | 2024-10-29 | 10:30—11:00 | 变氧量试验(大氧量) | 2.23 |
| T04 | 2024-10-29 | 11:25—11:55 | 变氧量试验(小氧量) | 2.66 |
| T05 | 2024-10-29 | 15:20—15:50 | 变二次风工况 | 2.15 |
| T06 | 2024-10-29 | 16:15—16:45 | 变燃尽风工况 | 2.39 |
| T07 | 2024-10-30 | 10:10—10:40 | 变一次风速工况 | 2.21 |
| T08 | 2024-10-30 | 11:00—11:30 | 变AA风工况 | 2.42 |
| T09 | 2024-10-30 | 13:40—14:10 | 变燃尽风工况 | 1.43 |
| T10 | 2024-10-30 | 14:30—15:00 | 变分离器转速工况 | 1.32 |
| T11 | 2024-10-31 | 15:30—6:00 | 变燃尽风左右摆角工况 | 1.89 |
| T12 | 2024-11-01 | 10:15—11:00 | 变上煤方式 | 2.90 |
| T13 | 2024-11-01 | 15:00—15:45 | 变上煤方式优化 | 1.96 |
| T14 | 2024-11-02 | 10:40—11:20 | 变磨组合方式工况(A、B、C磨) | 2.46 |
| T15 | 2024-11-02 | 13:05—13:35 | 三磨组合变氧量试验(小氧量) | 2.76 |
| T16 | 2024-11-02 | 13:55—14:25 | 三磨组合变氧量试验(大氧量) | 2.46 |
| T17 | 2024-11-02 | 15:00—15:30 | 变磨组合优化工况(ABC磨) | 2.02 |
| T18 | 2024-11-04 | 10:30—11:10 | 优化工况1 | 1.64 |
| T19 | 2024-11-04 | 11:30—12:00 | 优化工况2 | 1.28 |
), ArticleFig(id=1217836128862916861, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836120189096822, language=EN, label=Tab.2, caption=
Parameter optimization of the SSA-RF model
, figureFileSmall=null, figureFileBig=null, tableContent=
| 类别 | 参数 | 具体设置 |
|---|
| 优化参数维度与范围 | 优化参数维度 | 2 |
| 参数下限 | [1,1] |
| 参数上限 | [1 000,500] |
| 种群与迭代参数 | 麻雀种群数量 | 100 |
| 最大迭代次数 | 200 |
| SSA模型规则参数 | 预警值ST | 0.7 |
| 发现者比例PD | 0.4 |
| 侦察者比例SD | 0.2 |
), ArticleFig(id=1217836128963580158, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836120189096822, language=CN, label=表2, caption=
SSA-RF模型参数优化
, figureFileSmall=null, figureFileBig=null, tableContent=
| 类别 | 参数 | 具体设置 |
|---|
| 优化参数维度与范围 | 优化参数维度 | 2 |
| 参数下限 | [1,1] |
| 参数上限 | [1 000,500] |
| 种群与迭代参数 | 麻雀种群数量 | 100 |
| 最大迭代次数 | 200 |
| SSA模型规则参数 | 预警值ST | 0.7 |
| 发现者比例PD | 0.4 |
| 侦察者比例SD | 0.2 |
), ArticleFig(id=1217836129072632067, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836120189096822, language=EN, label=Tab.3, caption=
Fitting results of various models for fly ash carbon content prediction
, figureFileSmall=null, figureFileBig=null, tableContent=
| 模型 | 训练集 | 测试集 |
|---|
| δRMSE | δMAE | R2 | δRMSE | δMAE | R2 |
|---|
| MLR | 0.071 5 | 0.005 1 | 0.974 2 | 0.103 0 | 0.010 6 | 0.952 8 |
| RF | 0.011 6 | 0.006 0 | 0.999 3 | 0.035 1 | 0.017 8 | 0.994 2 |
| BP | 0.050 0 | 0.024 9 | 0.987 7 | 0.079 0 | 0.041 9 | 0.969 0 |
| PSO-SVM | 0.015 7 | 0.011 8 | 0.998 7 | 0.027 5 | 0.017 8 | 0.996 7 |
| FPA-RF | 0.011 2 | 0.006 3 | 0.999 3 | 0.021 9 | 0.010 1 | 0.997 3 |
| SSA-RF | 0.010 8 | 0.004 1 | 0.999 7 | 0.019 1 | 0.008 5 | 0.998 1 |
), ArticleFig(id=1217836129160712454, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836120189096822, language=CN, label=表3, caption=
各飞灰含碳量预测模型拟合结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| 模型 | 训练集 | 测试集 |
|---|
| δRMSE | δMAE | R2 | δRMSE | δMAE | R2 |
|---|
| MLR | 0.071 5 | 0.005 1 | 0.974 2 | 0.103 0 | 0.010 6 | 0.952 8 |
| RF | 0.011 6 | 0.006 0 | 0.999 3 | 0.035 1 | 0.017 8 | 0.994 2 |
| BP | 0.050 0 | 0.024 9 | 0.987 7 | 0.079 0 | 0.041 9 | 0.969 0 |
| PSO-SVM | 0.015 7 | 0.011 8 | 0.998 7 | 0.027 5 | 0.017 8 | 0.996 7 |
| FPA-RF | 0.011 2 | 0.006 3 | 0.999 3 | 0.021 9 | 0.010 1 | 0.997 3 |
| SSA-RF | 0.010 8 | 0.004 1 | 0.999 7 | 0.019 1 | 0.008 5 | 0.998 1 |
), ArticleFig(id=1217836129244598538, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836120189096822, language=EN, label=Tab.4, caption=
Operation parameters of the boiler before and after optimization
, figureFileSmall=null, figureFileBig=null, tableContent=
| 锅炉优化燃烧运行参数 | 优化前 | 优化后 |
|---|
| 喷口AGP1、AGP2开度/% | 40、40 | 39、30 |
| UAP风门开度/% | 40 | 30 |
| 喷口A、B、C、D开度/% | 55、55、50、50 | 20、42、32、22 |
| 喷口AA、AB、BC、CD开度/% | 60、20、20、30 | 62、41、29、20 |
| 磨煤机A、B、C、D分离器转速/(r·min–1) | 111、112、120、116 | 118、117、113、118 |
| AGP风喷嘴摆角/% | 50 | 52 |
| 磨煤机B、C、D出口温度/℃ | 85、55、62 | 66、61、58 |
| 磨煤机A、B、C、D进口一次风压/kPa | 5.5、5.7、5.7、6.6 | 6.0、6.1、6.5、7.0 |
| 左、右大风箱与炉膛压差/kPa | 0.37、0.33 | 0.39、0.35 |
), ArticleFig(id=1217836129395593489, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836120189096822, language=CN, label=表4, caption=
锅炉优化运行参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 锅炉优化燃烧运行参数 | 优化前 | 优化后 |
|---|
| 喷口AGP1、AGP2开度/% | 40、40 | 39、30 |
| UAP风门开度/% | 40 | 30 |
| 喷口A、B、C、D开度/% | 55、55、50、50 | 20、42、32、22 |
| 喷口AA、AB、BC、CD开度/% | 60、20、20、30 | 62、41、29、20 |
| 磨煤机A、B、C、D分离器转速/(r·min–1) | 111、112、120、116 | 118、117、113、118 |
| AGP风喷嘴摆角/% | 50 | 52 |
| 磨煤机B、C、D出口温度/℃ | 85、55、62 | 66、61、58 |
| 磨煤机A、B、C、D进口一次风压/kPa | 5.5、5.7、5.7、6.6 | 6.0、6.1、6.5、7.0 |
| 左、右大风箱与炉膛压差/kPa | 0.37、0.33 | 0.39、0.35 |
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