二次再热机组锅炉烟气余热利用方案研究
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摘要
以某典型超超临界二次再热机组为例,利用EBSILON软件,建立锅炉汽机一体化余热回收利用静态仿真模型,对4种余热回收方案(排挤一次再热前抽汽、排挤二次再热前抽汽、排挤全部高压加热器抽汽和排挤高压加热器-低压加热器抽汽)进行仿真计算,确定机组的热经济性。结果表明:排挤一次再热前抽汽的方案符合能量梯级利用和提高回热再热循环效率原则,节能效果最好,设计工况下发电标准煤耗率减少了7.24 g/(kW·h);变工况时不仅煤耗率相对减少率最大,而且变化幅度较为平缓,节能效果也最好。
In this paper,with a typical ultra-supercritical secondary reheat unit as an example,a static simulation model for the integrated waste heat recovery and utilization of boiler-steam turbine was established with the software of EBSILON.Four waste heat recovery schemes were simulated(squeezing out steam before reheating,squeezing out steam before secondary reheating,squeezing all high pumping steam and squeezing high-low pumping steam),and the corresponding thermal economy of the unit was determined.The results showed that the scheme 1 of pumping steam before primary reheating confirms to the principle of energy cascade utilization and improvement of reheating and heat recycling efficiency,resulting in the best energy saving effect under the design condition,and 7.24 g/(kW·h) reduction in the standard coal consumption rate of power generation.Under the varying operating conditions,scheme 1 has not only the largest relative reduction rate of coal consumption,but also a relatively smooth change range.
In this paper,with a typical ultra-supercritical secondary reheat unit as an example,a static simulation model for the integrated waste heat recovery and utilization of boiler-steam turbine was established with the software of EBSILON.Four waste heat recovery schemes were simulated(squeezing out steam before reheating,squeezing out steam before secondary reheating,squeezing all high pumping steam and squeezing high-low pumping steam),and the corresponding thermal economy of the unit was determined.The results showed that the scheme 1 of pumping steam before primary reheating confirms to the principle of energy cascade utilization and improvement of reheating and heat recycling efficiency,resulting in the best energy saving effect under the design condition,and 7.24 g/(kW·h) reduction in the standard coal consumption rate of power generation.Under the varying operating conditions,scheme 1 has not only the largest relative reduction rate of coal consumption,but also a relatively smooth change range.
引文
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[11] 林俐,田欣雨.基于火电机组分级深度调峰的电力系统经济调度及效益分析[J].电网技术,2017,41(7):2255-2263.LIN Li,TIAN Xin-yu.Analysis of deep peak regulation and its benefit of thermal units in power system with large scale wind power integrated[J].Power System Technology,2017,41(7):2255-2263.
[12] 宋景慧,李永毅.电站锅炉深度余热利用系统变工况节能效果分析[J].锅炉技术,2015,46(6):6-12.SONG Jing-hui,LI Yong-yi.Analysis on energy saving effect of deep waste heat utilization system in power station boilers under different working conditions[J].Boiler Technology,2015,46(6):6-12.
[13] 陈波,周慎学,丁宁,等.超(超)临界机组高加给水旁路调节方式的一次调频控制技术研究与试验[J].中国电力,2017,50(8):32-36.CHEN Bo,ZHOU Shen-xue,DING Ning,et al.Research and test on primary frequency control technology of supercritical unit with high feed water bypass regulation[J].Electric Power,2017,50(8):32-36.
[14] 徐钢,许诚,杨勇平,等.电站锅炉余热深度利用及尾部受热面综合优化[J].中国电机工程学报,2013,33(14):1-8.XU Gang,XU Cheng,YANG Yong-ping,et al.Deep utilization of exhaust heat and comprehensive optimization of tail heating surfaces for utility boilers[J].Proceedings of CSEE,2013,33(14):1-8.
[15] 孙杰,尹金亮.一种锅炉烟气余热利用的高效循环系统分析[J].热力发电,2013,42(8):22-33.SUN Jie,YIN Jin-liang.A high effective circulating system for exhaust heat utilization[J].Thermal Power Generation,2013,42(8):22-33.
[2] GUO Han-ding.Analysis of common-plot action during putting on records of completed projects[C]//Wireless Communications,Networking and Mobile Computing,WiCOM '08.4th International Conference on.IEEE,2008.
[3] 宋金勇.锅炉烟气余热利用的热力学分析及其优化设计[J].应用能源技术,2017(4):30-32.SONG Jin-yong.Thermodynamic analysis and optimization design of boiler flue gas waste heat utilization[J].Applied Energy Technology,2017(4):30-32.
[4] 吴华新.低位烟气余热深度回收利用状况述评(Ⅰ)--新技术路线与回收条件改变的影响[J].热能动力工程,2012,27(3):271-276.WU Hua-xin.A review on the recovery and utilization of low flue gas waste heat depth(I)--the influence of new technology route and recycling condition change[J].Journal of Engineering for Thermal Energy and Power,2012,27(3):271-276.
[5] 王迅,李宇曦,李想,等.电厂燃煤锅炉烟气余热回收的优化利用[J].燃烧科学与技术,2018,24(1):15-20.WANG Xun,LI Yu-xi,LI Xiang,et al.Optimized utilization of waste heat recovery from flue gas of coal-Fired boiler in power plant[J].Journal of Combustion Science and Technology,2018,24(1):15-20.
[6] 徐民,赵明,梁俊宇,等.火电锅炉烟气余热利用研究[J].热能动力工程,2015,30(6):880-884.XU Min,ZHAO Ming,LIANG Jun-yu,et al.Research on waste heat utilization of flue gas in thermal power boiler[J].Journal of Engineering for Thermal Energy and Power,2015,30(6):880-884.
[7] HABERMANN M,GOTTE C,SCHEFFKNECHT G,et al.Supercritical lignite-fired boiler for RWE’s new 1100 MW unit[C]//Power-Gen Europe Conference,2004.
[8] 宋景慧,刘桂才,廖艳芬,等.燃煤机组锅炉低温烟气余热利用节能效益分析[J].热力发电,2015,44(9):57-60.SONG Jing-hui,LIU Gui-cai,LIAO Yan-fen,et al.Energy-saving analysis for heat recovery from low-temperature flue gas in coal-fired units[J].Thermal Power Generation,2015,44(9):57-60.
[9] 郑莆燕,王乔良.电站锅炉烟气余热利用方案优化[J].热力发电,2017,46(7):5-11.ZHENG Pu-yan,WANG Qiao-liang.Optimization on flue gas waste heat recovery scheme in utility boiler[J].Thermal Power Generation,2017,46(7):5-11.
[10] 闫哲,张士明,顾勇.1 000 MW超超临界二次再热机组设计优化方案的探讨[J].发电设备,2017,31(5):360-362.YAN Zhe,ZHANG Shi-ming,GU Yong.Design optimization of a 1 000 MW ultra supercritical double-reheat unit[J].Power Equipment,2017,31(5):360-362.
[11] 林俐,田欣雨.基于火电机组分级深度调峰的电力系统经济调度及效益分析[J].电网技术,2017,41(7):2255-2263.LIN Li,TIAN Xin-yu.Analysis of deep peak regulation and its benefit of thermal units in power system with large scale wind power integrated[J].Power System Technology,2017,41(7):2255-2263.
[12] 宋景慧,李永毅.电站锅炉深度余热利用系统变工况节能效果分析[J].锅炉技术,2015,46(6):6-12.SONG Jing-hui,LI Yong-yi.Analysis on energy saving effect of deep waste heat utilization system in power station boilers under different working conditions[J].Boiler Technology,2015,46(6):6-12.
[13] 陈波,周慎学,丁宁,等.超(超)临界机组高加给水旁路调节方式的一次调频控制技术研究与试验[J].中国电力,2017,50(8):32-36.CHEN Bo,ZHOU Shen-xue,DING Ning,et al.Research and test on primary frequency control technology of supercritical unit with high feed water bypass regulation[J].Electric Power,2017,50(8):32-36.
[14] 徐钢,许诚,杨勇平,等.电站锅炉余热深度利用及尾部受热面综合优化[J].中国电机工程学报,2013,33(14):1-8.XU Gang,XU Cheng,YANG Yong-ping,et al.Deep utilization of exhaust heat and comprehensive optimization of tail heating surfaces for utility boilers[J].Proceedings of CSEE,2013,33(14):1-8.
[15] 孙杰,尹金亮.一种锅炉烟气余热利用的高效循环系统分析[J].热力发电,2013,42(8):22-33.SUN Jie,YIN Jin-liang.A high effective circulating system for exhaust heat utilization[J].Thermal Power Generation,2013,42(8):22-33.
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