国内首台二次再热机组锅炉混合吹管实践及优化
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摘要
为探索适用于超超临界二次再热机组的锅炉吹管工艺,以我国首台投产的二次再热机组锅炉为研究对象,提出并实践了一种降压法混合式管道吹洗方案。该方案综合了"一段吹管"的系统形式和"两段吹管"的操作特点,即将过热器、一次再热器、二次再热器及其附属管道一次性串联,吹扫时则分3部分进行,各部分独立打靶验收。针对新工艺实践过程中出现的吹管系数不达标问题,进行了现场测试和理论分析,提出了提高汽水分离器出口压力、增加临吹门开启个数等措施,基本消除了阀门的阻塞流效应,保证了管道的吹洗效果。最终靶板检验结果表明,降压法混合吹管实现了对二次再热机组锅炉各受热面的高质量吹扫,该吹管工艺对同类机组具有实际参考意义。
To explore suitable pipe-blowing methods for ultra supercritical double-reheat units, a decompression combined pipe-blowing method was proposed and put into practice on the domestic first double-reheat boiler. This new method is a combination of "one section pipe-blowing" method's structure and "two-section pipe-blowing"method's operating characteristics. The superheater, primary reheater, secondary reheater and its associated pipelines were connected in series in one time. The whole system is divided into three parts, and each part is purged and targeted separately. For the problem that the steam purge coefficient does not satisfy the standard, field test and theoretical analysis were carried out. Some measures, such as increasing the separator outlet steam pressure, opening multiple valves simultaneously, were taken into practice to eliminate the blocking flow effect and guarantee the purging quality. The final target plate tests results show that, the depression combined pipe-blowing method completed the purging of double-reheat boiler heating surfaces with high quality. This method can provide practical reference for other similar units.
To explore suitable pipe-blowing methods for ultra supercritical double-reheat units, a decompression combined pipe-blowing method was proposed and put into practice on the domestic first double-reheat boiler. This new method is a combination of "one section pipe-blowing" method's structure and "two-section pipe-blowing"method's operating characteristics. The superheater, primary reheater, secondary reheater and its associated pipelines were connected in series in one time. The whole system is divided into three parts, and each part is purged and targeted separately. For the problem that the steam purge coefficient does not satisfy the standard, field test and theoretical analysis were carried out. Some measures, such as increasing the separator outlet steam pressure, opening multiple valves simultaneously, were taken into practice to eliminate the blocking flow effect and guarantee the purging quality. The final target plate tests results show that, the depression combined pipe-blowing method completed the purging of double-reheat boiler heating surfaces with high quality. This method can provide practical reference for other similar units.
引文
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[14]赵志丹,郝德锋,王海涛,等.二次再热超超临界机组再热蒸汽温度控制策略[J].热力发电,2015,44(12):113-118.ZHAO Zhidan,HAO Defeng,WANG Haitao,et al.Double reheat ultra-supercritical unit reheat steam temperature control[J].Thermal Power Generation,2015,44(12):113-118.
[15]白冬波,卢旭东.超超临界二次再热机组冲管方案的探讨[J].电站系统工程,2016(1):28-30.BAI Dongbo,LU Xudong.Discussion on steam blowing techniques of ultra-supercritical unit with double reheat[J].Power System Engineering,2016(1):28-30.
[16]蔡宝玲,高海东,王剑钊,等.二次再热超超临界机组动态特性分析及控制策略验证[J].中国电机工程学报,2016,36(19):5288-5299.CAI Baoling,GAO Haidong,WANG Jianzhao,et al.Dynamic process characteristic anlysis and control strategy verification on double reheat ultra-supercritical coal-fired power units[J].Proceedings of the CSEE,2016,36(19):5288-5299.
[17]陈有福,陶谦,管诗骈,等.1 000 MW二次再热示范机组降压冲管研究[J].中国电力,2016,49(11):112-118.CHEN Youfu,TAO Qian,GUAN Shipian,et al.Study on depressurized steam blowing of demonstrative 1 000 MW unit with double reheat cycles[J].Electric Power Generation,2016,49(11):112-118.
[18]贺继旺,杨博,谢泾巍,等.华能安源电厂“上大压小”新建工程1号机组锅炉专业调试报告[R].西安:西安热工研究院有限公司,2015:25-40.HE Jiwang,YANG Bo,XIE Jingwei,et al.Boiler professional commissioning report for Huaneng An’yuan power plant“big pressure on the small”expansion project of No.1 units[R].Xi’an:Xi’an Thermal Power Research Institute Co.,Ltd.,2015:25-40(in Chinese).
[19]叶长流,刘喜超,谢恩飞.调节阀阻塞流问题分析[J].核动力工程,2013(增刊2):93-96.YE Changliu,LIU Xichao,XIE Enfei,et al.Analysis of choked flow in control valves[J].Nuclear Power Engineering,2013(Suppl.2):93-96.
[20]刘芳.控制阀闪蒸和空化现象及阻塞流的计算[J].石油化工自动化,2010,46(2):64-65.LIU Fang.Control valve flash and cavitation phenomenon and blocking the flow calculation[J].Automation in PetroChemical Industry,2010,46(2):64-65.
[2]蒋敏华,黄斌.燃煤发电技术展望[J].中国电机工程学报,2013,32(29):1-8.JIANG Minhua,HUANG Bin.Prospects on coal-fired power generation technology development[J].Proceedings of the CSEE,2013,32(29):1-8.
[3]韩中合,田欢.二次再热机组汽轮机抽汽参数确定方法[J].热力发电,2015,44(12):27-30.HAN Zhonghe,TIAN Huan.Determination methods for extraction steam parameters of double steam reheat unit[J].Thermal Power Generation,2015,44(12):27-30.
[4]黄智,万鹏,李杨,等.超临界二次再热抽汽凝汽式机组热力系统的经济性诊断[J].热力发电,2005,34(12):44-47.HUANG Zhi,WAN Peng,LI Yang,et al.Economic behavior diagnosis of thermodynamic system for supercritical double reheat eatraction[J].Thermal Power Generation,2005,34(12):44-47.
[5]张彦军,茅义军,张殿军,等.国内首台660 MW等级二次再热超超临界锅炉开发及运行[J].锅炉制造,2016(1):1-6.ZHANG Yanjun,MAO Yijun,ZHANG Dianjun,et al.The design&operation of the first domestic 660MWe double reheater ultra-supercritical boiler[J].Boiler Manufacturing,2016(1):1-6.
[6]谷雅秀,王生鹏,杨寿敏,等.超超临界二次再热发电机组热经济性分析[J].热力发电,2013,42(9):7-9.GU Yaxiu,WANG Shengpeng,YANG Shoumin,et al.Thermal economic analysis on an ultra supercritical unit with second reheat cycle[J].Thermal Power Generation,2013,42(9):7-9.
[7]王林,刘辉,李康,等.1000 MW二次再热塔式炉三段吹管新工艺[J].陕西电力,2016,44(10):82-85.WANG Lin,LIU Hui,LI Kang,et al.Application of threesection purging technology in 1000MW double-reheat tower type boiler[J].Shaanxi Electric Power,2016,44(10):82-85.
[8]高昊天,范浩杰,董建聪,等.超超临界二次再热机组的发展[J].锅炉技术,2014,45(4):1-3.GAO Haotian,FAN Haojie,DONG Jiancong,et al.Development of ultra supercritical unit with double reheat cycle[J].Boiler Technology,2014,45(4):1-3.
[9]王林,刘辉,刘超,等.1000 MW超超临界二次再热塔式锅炉过热器超温分析与对策[J].陕西电力,2016,44(8):80-83.WANG Lin,LIU Hui,LIU Chao,et al.Analysis of superheater over-temperature of 1000MW double reheat tower type boiler&its countermeasure[J].Shaanxi Electric Power,2016,44(8):80-83.
[10]严俊杰,邵树峰,李杨,等.二次再热超临界机组热力系统经济性定量分析方法[J].中国电机工程学报,2004,24(1):186-190.YAN Junjie,SHAO Shufeng,LI Yang,et al.A method for analysis the economics of a thermal system in a supercritical pressure power unit with double reheat cycles[J].Proceedings of the CSEE,2004,24(1):186-190.
[11]殷亚宁.二次再热超超临界机组应用现状及发展[J].电站系统工程,2013(2):37-38.YIN Yaning.Application status and development of USC unit with double reheat cycles[J].Power System Engineering,2013(2):37-38.
[12]牛海明,吴东黎,杨爽,等.超超临界1000 MW二次再热机组自启停控制系统设计方案与实现[J].热力发电,2017(2):125-129.NIU Haiming,WU Dongli,YANG Shuang,et al.Design scheme and application of APS system in an ultrasupercritical 1000MW unit with double-reheat cycle[J].2017(2):125-129.
[13]杨新民,吴恒运,茅义军.超超临界二次再热机组再热汽温的控制[J].中国电力,2016,49(1):19-22.YANG Xinmin,WU Hengyun,MAO Yijun,et al.Reheat steam temperature control of ultra supercritical unit with second reheat cycle[J].Electric Power,2016,49(1):19-22.
[14]赵志丹,郝德锋,王海涛,等.二次再热超超临界机组再热蒸汽温度控制策略[J].热力发电,2015,44(12):113-118.ZHAO Zhidan,HAO Defeng,WANG Haitao,et al.Double reheat ultra-supercritical unit reheat steam temperature control[J].Thermal Power Generation,2015,44(12):113-118.
[15]白冬波,卢旭东.超超临界二次再热机组冲管方案的探讨[J].电站系统工程,2016(1):28-30.BAI Dongbo,LU Xudong.Discussion on steam blowing techniques of ultra-supercritical unit with double reheat[J].Power System Engineering,2016(1):28-30.
[16]蔡宝玲,高海东,王剑钊,等.二次再热超超临界机组动态特性分析及控制策略验证[J].中国电机工程学报,2016,36(19):5288-5299.CAI Baoling,GAO Haidong,WANG Jianzhao,et al.Dynamic process characteristic anlysis and control strategy verification on double reheat ultra-supercritical coal-fired power units[J].Proceedings of the CSEE,2016,36(19):5288-5299.
[17]陈有福,陶谦,管诗骈,等.1 000 MW二次再热示范机组降压冲管研究[J].中国电力,2016,49(11):112-118.CHEN Youfu,TAO Qian,GUAN Shipian,et al.Study on depressurized steam blowing of demonstrative 1 000 MW unit with double reheat cycles[J].Electric Power Generation,2016,49(11):112-118.
[18]贺继旺,杨博,谢泾巍,等.华能安源电厂“上大压小”新建工程1号机组锅炉专业调试报告[R].西安:西安热工研究院有限公司,2015:25-40.HE Jiwang,YANG Bo,XIE Jingwei,et al.Boiler professional commissioning report for Huaneng An’yuan power plant“big pressure on the small”expansion project of No.1 units[R].Xi’an:Xi’an Thermal Power Research Institute Co.,Ltd.,2015:25-40(in Chinese).
[19]叶长流,刘喜超,谢恩飞.调节阀阻塞流问题分析[J].核动力工程,2013(增刊2):93-96.YE Changliu,LIU Xichao,XIE Enfei,et al.Analysis of choked flow in control valves[J].Nuclear Power Engineering,2013(Suppl.2):93-96.
[20]刘芳.控制阀闪蒸和空化现象及阻塞流的计算[J].石油化工自动化,2010,46(2):64-65.LIU Fang.Control valve flash and cavitation phenomenon and blocking the flow calculation[J].Automation in PetroChemical Industry,2010,46(2):64-65.