基于历史数据的汽轮机调节阀流量特性优化
|
摘要
汽轮机在经过长期运行、汽轮机数字电液控制系统(DEH)或通流部分改造后,汽轮机调节阀的实际流量特性曲线将偏离设计值,从而影响机组一次调频和负荷控制能力,而现场流量特性试验存在试验条件苛刻、耗时长、精度低等缺点。本文通过对机组历史运行数据进行分析和挖掘,针对不同的情况提出2种方法以辨识汽轮机调节阀实际流量特性,有阀后压力数据时采用迭代计算求出各阀门流量特性曲线,无阀后压力数据时采用弗留格尔公式求出阀组流量特性曲线,分别通过仿真和分段线性化对DEH阀门管理曲线进行优化修正,确定阀门合理的重叠度。将该方法应用于某660 MW机组,结果表明在顺序阀模式下,汽轮机调节阀流量特性曲线的线性度有了很大改善,机组自动发电控制(AGC)变负荷和一次调频的能力得到了提高。
After long-term operation and retrofit of digital electro-hydraulic(DEH) control system or flow path of steam turbine, the actual flow characteristic curve of the turbine's regulating valve will deviate from the design values, thus affecting the unit's primary frequency and load control ability. However, the field flow characteristics test has common shortcomings of severe test conditions, long duration and low precision. In this article, through analysis and excavation of the unit's historical operation data, two methods are proposed for different situations to identify the actual flow characteristics of the steam turbine's regulating valve. The flow characteristic curves of each valve are obtained by iteration calculation when the downstream pressure data can be achieved, or by the Freugel's formula when the downstream pressure data can not be achieved. The DEH valve management curve is optimized by simulation and piece-wise linearization to determine the reasonable valve overlap degree. The application of this method in a 660 MW unit shows that, in sequence valve operation mode, the linearity of the flow characteristics curve has been improved greatly, and the capability of the load variation and primary frequency regulation have been enhanced.
After long-term operation and retrofit of digital electro-hydraulic(DEH) control system or flow path of steam turbine, the actual flow characteristic curve of the turbine's regulating valve will deviate from the design values, thus affecting the unit's primary frequency and load control ability. However, the field flow characteristics test has common shortcomings of severe test conditions, long duration and low precision. In this article, through analysis and excavation of the unit's historical operation data, two methods are proposed for different situations to identify the actual flow characteristics of the steam turbine's regulating valve. The flow characteristic curves of each valve are obtained by iteration calculation when the downstream pressure data can be achieved, or by the Freugel's formula when the downstream pressure data can not be achieved. The DEH valve management curve is optimized by simulation and piece-wise linearization to determine the reasonable valve overlap degree. The application of this method in a 660 MW unit shows that, in sequence valve operation mode, the linearity of the flow characteristics curve has been improved greatly, and the capability of the load variation and primary frequency regulation have been enhanced.
引文
[1]马琳,胥建群,曹祖庆.基于量纲分析的汽轮机调节级变工况特性研究[J].中国电机工程学报,2014,34(5):778-783.MA Lin,XU Jianqun,CAO Zuqing.Research on varying condition characteristic of steam turbine governing stage based on dimensional analysis[J].Proceedings of the CSEE,2014,34(5):778-783.
[2]李劲柏,刘复平.汽轮机阀门流量特性函数优化和对机组安全性经济性的影响[J].中国电力,2008,41(12):50-53.LI Jinbai,LIU Fuping.Optimization for the flow characteristic function of turbine valves and the influences on safe and economic operation[J].Electric Power,2008,41(12):50-53.
[3]李虹锐,王智微.基于历史数据计算母管制机组各台汽轮机进汽流量的研究[J].中国电机工程学报,2016,36(增刊1):154-160.LI Hongrui,WANG Zhiwei.Research on the calculation of the steam rate of turbines based on the historical data in the units with common steam header system[J].Proceedings of the CSEE,2016,36(Suppl.1):154-160.
[4]孙长生,尹淞,苏烨,等.电力行业燃煤机组热控调节系统运行情况调研[J].中国电力,2013,46(4):16-20.SUN Changsheng,YIN Song,SU Ye,et al.Survey and analysis on thermal control regulation system for coal-fired units in electric power industry[J].Electric Power,2013,46(4):16-20.
[5]郑国,张甘泉,胡晏铭.300 MW汽轮机主汽调节阀组流动特性分析及优化改造[J].中国电力,2016,49(4):119-123.ZHENG Guo,ZHANG Ganquan,HU Yanmin.Flow characteristics analysis and optimization of the main steam control valve in 300 MW steam turbine units[J].Electric Power,2016,49(4):119-123.
[6]张宝,顾正皓,樊印龙,等.通过试验计算汽轮机的流量特性[J].汽轮机技术,2013,55(3):215-218.ZHANG Bao,GU Zhenghao,FAN Yinlong,et al.Calculating the steam turbine flow characteristics through testing[J].Turbine Technology,2013,55(3):215-218.
[7]尚星宇,何永君,王瑞,等.基于数据拟合的汽轮机调节阀流量特性优化[J].热力发电,2017,46(3):121-125.SHANG Xingyu,HE Yongjun,WANG Rui,et al.Flow characteristics optimization for steam turbine valves based on data fitting[J].Thermal Power Generation,2017,46(3):121-125.
[8]邹包产,赵宇,李云,等.基于BP神经网络的汽轮机调阀流量特性校正[J].电力科学与工程,2017,33(5):60-64.ZOU Baochan,ZHAO Yu,LI Yun,et al.Correction of flow characteristic of steam turbine governing valve based on BP neural network[J].Electric Power Science and Engineering,2017,33(5):60-64.
[9]陈坚红,乔庆,张宝,等.汽轮机调节级临界压比特性[J].浙江大学学报(工学版),2014,48(11):2072-2079.CHEN Jianhong,QIAO Qing,ZHANG Bao,et al.Critical pressure ratio characteristics of steam turbine governing stage[J].Journal of Zhejiang University(Engineering Science),2014,48(11):2072-2079.
[10]李存文,王刚,梁正玉,等.基于喷嘴流量计算公式的汽轮机调节阀组流量特性曲线辨识方法研究[C]//2015年中国电机工程学会年会论文集,武汉:中国电机工程学会,2015:440.LI Cunwen,WANG Gang,LIANG Zhengyu,et al.Research on the identification and optimization method to steam turbine regulating valve flow characteristic based by nozzle flow calculation[C]//Annual Meeting of China Society of Electrical Engineering in 2015,Wuhan:China Society of Electrical Engineering,2015:440.
[11]王刚,李存文,梁正玉,等.基于特征通流面积的汽轮机流量特性辨识方法[J].热力发电,2016,45(6):33-39.WANG Gang,LI Cunwen,LIANG Zhengyu,et al.Identification method for flow characteristics of steam turbine based on characteristic flow area[J].Thermal Power Generation,2016,45(6):33-39.
[12]万祥,胡念苏,韩鹏飞,等.大数据挖掘技术应用于汽轮机组运行性能优化的研究[J].中国电机工程学报,2016,36(2):459-467.WAN Xiang,HU Niansu,HAN Pengfei,et al.Research on application of big data mining technology in performance optimization of steam turbines[J].Proceedings of the CSEE,2016,36(2):459-467.
[13]徐婧,顾煜炯,王仲,等.基于数据挖掘的煤电机组能效特征指标及其基准值的研究[J].中国电机工程学报,2017,37(7):2009-2015.XU Jing,GU Yujiong,WANG Zhong,et al.Research on indexes of energy efficiency and its reference-value for coal-fired power units based on data-mining[J].Proceedings of the CSEE,2017,37(7):2009-2015.
[14]赵欢,王培红,钱瑾,等.基于模糊c-均值聚类的锅炉监控参数基准值建模[J].中国电机工程学报,2011,31(32):16-22.ZHAO Huan,WANG Peihong,QIAN Jin,et al.Modeling for target-value of boiler monitoring parameters based on fuzzy c-means clustering algorithm[J].Proceedings of the CSEE,2011,31(32):16-22.
[15]徐大懋,邓德兵,王世勇,等.汽轮机的特征通流面积及弗留格尔公式改进[J].动力工程学报,2010,30(7):473-477.XU Damao,DENG Debing,WANG Shiyong,et al.Application of characteristic flow area of steam turbines and improvement on flügel formula[J].Power Engineering,2010,30(7):473-477.
[16]汪军,周建新.汽轮机主蒸汽流量在线计算方法及应用[J].热力发电,2010,39(10):42-45.WANG Jun,ZHOU Jianxin.On-line calculation method for the main steam flow rate of steam turbine and its application[J].Thermal Power Generation,2010,39(10):42-45.
[17]高亚杰,阚玉英.基于历史数据分析的汽机调门曲线优化[J].华北电力技术,2012(10):35-39.GAO Yajie,KAN Yuying.Optimization of turbine governor valve curve based on historical data[J].North China Electric Power,2012(10):35-39.
[18]王刚,梁正玉,李存文,等.大数据分析在汽轮机调节门特性参数辨识及优化中的应用[J].中国电力,2016,49(6):15-19.WANG Gang,LIANG Zhengyu,LI Cunwen,et al.Application of large data analysis on characteristics parameter identification and optimization of steam turbine regulating valves[J].Electric Power,2016,49(6):15-19.
[2]李劲柏,刘复平.汽轮机阀门流量特性函数优化和对机组安全性经济性的影响[J].中国电力,2008,41(12):50-53.LI Jinbai,LIU Fuping.Optimization for the flow characteristic function of turbine valves and the influences on safe and economic operation[J].Electric Power,2008,41(12):50-53.
[3]李虹锐,王智微.基于历史数据计算母管制机组各台汽轮机进汽流量的研究[J].中国电机工程学报,2016,36(增刊1):154-160.LI Hongrui,WANG Zhiwei.Research on the calculation of the steam rate of turbines based on the historical data in the units with common steam header system[J].Proceedings of the CSEE,2016,36(Suppl.1):154-160.
[4]孙长生,尹淞,苏烨,等.电力行业燃煤机组热控调节系统运行情况调研[J].中国电力,2013,46(4):16-20.SUN Changsheng,YIN Song,SU Ye,et al.Survey and analysis on thermal control regulation system for coal-fired units in electric power industry[J].Electric Power,2013,46(4):16-20.
[5]郑国,张甘泉,胡晏铭.300 MW汽轮机主汽调节阀组流动特性分析及优化改造[J].中国电力,2016,49(4):119-123.ZHENG Guo,ZHANG Ganquan,HU Yanmin.Flow characteristics analysis and optimization of the main steam control valve in 300 MW steam turbine units[J].Electric Power,2016,49(4):119-123.
[6]张宝,顾正皓,樊印龙,等.通过试验计算汽轮机的流量特性[J].汽轮机技术,2013,55(3):215-218.ZHANG Bao,GU Zhenghao,FAN Yinlong,et al.Calculating the steam turbine flow characteristics through testing[J].Turbine Technology,2013,55(3):215-218.
[7]尚星宇,何永君,王瑞,等.基于数据拟合的汽轮机调节阀流量特性优化[J].热力发电,2017,46(3):121-125.SHANG Xingyu,HE Yongjun,WANG Rui,et al.Flow characteristics optimization for steam turbine valves based on data fitting[J].Thermal Power Generation,2017,46(3):121-125.
[8]邹包产,赵宇,李云,等.基于BP神经网络的汽轮机调阀流量特性校正[J].电力科学与工程,2017,33(5):60-64.ZOU Baochan,ZHAO Yu,LI Yun,et al.Correction of flow characteristic of steam turbine governing valve based on BP neural network[J].Electric Power Science and Engineering,2017,33(5):60-64.
[9]陈坚红,乔庆,张宝,等.汽轮机调节级临界压比特性[J].浙江大学学报(工学版),2014,48(11):2072-2079.CHEN Jianhong,QIAO Qing,ZHANG Bao,et al.Critical pressure ratio characteristics of steam turbine governing stage[J].Journal of Zhejiang University(Engineering Science),2014,48(11):2072-2079.
[10]李存文,王刚,梁正玉,等.基于喷嘴流量计算公式的汽轮机调节阀组流量特性曲线辨识方法研究[C]//2015年中国电机工程学会年会论文集,武汉:中国电机工程学会,2015:440.LI Cunwen,WANG Gang,LIANG Zhengyu,et al.Research on the identification and optimization method to steam turbine regulating valve flow characteristic based by nozzle flow calculation[C]//Annual Meeting of China Society of Electrical Engineering in 2015,Wuhan:China Society of Electrical Engineering,2015:440.
[11]王刚,李存文,梁正玉,等.基于特征通流面积的汽轮机流量特性辨识方法[J].热力发电,2016,45(6):33-39.WANG Gang,LI Cunwen,LIANG Zhengyu,et al.Identification method for flow characteristics of steam turbine based on characteristic flow area[J].Thermal Power Generation,2016,45(6):33-39.
[12]万祥,胡念苏,韩鹏飞,等.大数据挖掘技术应用于汽轮机组运行性能优化的研究[J].中国电机工程学报,2016,36(2):459-467.WAN Xiang,HU Niansu,HAN Pengfei,et al.Research on application of big data mining technology in performance optimization of steam turbines[J].Proceedings of the CSEE,2016,36(2):459-467.
[13]徐婧,顾煜炯,王仲,等.基于数据挖掘的煤电机组能效特征指标及其基准值的研究[J].中国电机工程学报,2017,37(7):2009-2015.XU Jing,GU Yujiong,WANG Zhong,et al.Research on indexes of energy efficiency and its reference-value for coal-fired power units based on data-mining[J].Proceedings of the CSEE,2017,37(7):2009-2015.
[14]赵欢,王培红,钱瑾,等.基于模糊c-均值聚类的锅炉监控参数基准值建模[J].中国电机工程学报,2011,31(32):16-22.ZHAO Huan,WANG Peihong,QIAN Jin,et al.Modeling for target-value of boiler monitoring parameters based on fuzzy c-means clustering algorithm[J].Proceedings of the CSEE,2011,31(32):16-22.
[15]徐大懋,邓德兵,王世勇,等.汽轮机的特征通流面积及弗留格尔公式改进[J].动力工程学报,2010,30(7):473-477.XU Damao,DENG Debing,WANG Shiyong,et al.Application of characteristic flow area of steam turbines and improvement on flügel formula[J].Power Engineering,2010,30(7):473-477.
[16]汪军,周建新.汽轮机主蒸汽流量在线计算方法及应用[J].热力发电,2010,39(10):42-45.WANG Jun,ZHOU Jianxin.On-line calculation method for the main steam flow rate of steam turbine and its application[J].Thermal Power Generation,2010,39(10):42-45.
[17]高亚杰,阚玉英.基于历史数据分析的汽机调门曲线优化[J].华北电力技术,2012(10):35-39.GAO Yajie,KAN Yuying.Optimization of turbine governor valve curve based on historical data[J].North China Electric Power,2012(10):35-39.
[18]王刚,梁正玉,李存文,等.大数据分析在汽轮机调节门特性参数辨识及优化中的应用[J].中国电力,2016,49(6):15-19.WANG Gang,LIANG Zhengyu,LI Cunwen,et al.Application of large data analysis on characteristics parameter identification and optimization of steam turbine regulating valves[J].Electric Power,2016,49(6):15-19.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |