再热蒸汽调温方式对机组变负荷能耗特性的影响
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摘要
再热蒸汽温度是机组变负荷过程中需准确控制的参数之一。本文针对两种再热汽温控制方式的控制效果及其对机组变负荷过程能耗特性的影响展开了研究。结果表明:与改变尾部烟道烟气挡板开度相比,以摆动燃烧器调节再热汽温具有较好的控制效果;变负荷过程具有较低的平均标准发电煤耗率。升负荷过程中,随着变负荷速率升高,控制方式引起的平均标准发电煤耗率差值逐渐减小,差异最大值为0.59 g·kW~(-1)·h~(-1);降负荷过程中,变化规律相反,差异最大值为0.11 g·kW~(-1)·h~(-1)。
Reheat steam temperature is one of the most important parameters which needs high accuracy controlling during load cycling processes. Studies on the control effects of reheat steam temperature with two different control strategies during transient processes have been done in this paper. The energy consumption characteristics of the power plant during load cycling processes are analyzed in detail. The calculation results show that: the tilting burner method has advantages over regulating the opening of the baffle in the boiler tail flue method. With the tilting burner method, the temperature overshoot and the average standard coal consumption rate are less. During loading up processes, with the increasing in load cycling rate, the difference in the average coal consumption rate declines gradually, and the maximum value of the difference is 0.59 g·kW~(-1)·h~(-1). While for loading down process, the difference in average standard coal consumption increases with the load cycling rate, and the maximum value of the difference is 0.11 g·kW~(-1)·h~(-1).
Reheat steam temperature is one of the most important parameters which needs high accuracy controlling during load cycling processes. Studies on the control effects of reheat steam temperature with two different control strategies during transient processes have been done in this paper. The energy consumption characteristics of the power plant during load cycling processes are analyzed in detail. The calculation results show that: the tilting burner method has advantages over regulating the opening of the baffle in the boiler tail flue method. With the tilting burner method, the temperature overshoot and the average standard coal consumption rate are less. During loading up processes, with the increasing in load cycling rate, the difference in the average coal consumption rate declines gradually, and the maximum value of the difference is 0.59 g·kW~(-1)·h~(-1). While for loading down process, the difference in average standard coal consumption increases with the load cycling rate, and the maximum value of the difference is 0.11 g·kW~(-1)·h~(-1).
引文
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[2]张方炜,刘原一,谭厚章,等.超临界火力发电机组二次再热技术研究[J].电力勘测设计,2013(2):34-39ZHANG Fangwei,LIU Yuanyi,TAN Houzhang,et al.Study of Secondly Reheat Technique of Supercritical Fire Power Generators[J].Electric Power Survey&Design,2013(2):34-39
[3]周振起,郜宁,李勇.蒸汽调温方式对机组经济性的影响分析[J].汽轮机技术,2007,49(5):379-381ZHOU Zhenqi,GAO Ning,LI Yong.The Analysis on the Impacts of the Impacts of the Unit Economical Efficiency about the Ways of Steam Tempsering[J].Turbine Technology,2007,49(5):379-381
[4]胡国梁,谢力群,郑炜.国产300MW机组锅炉燃烧器倾角投自动及调节再热汽温的探讨[J].中国电力,2003,36(4):68-70HU Guoliang,XIE Liqun,ZHENG Wei.Automatically Adjust the Tilting Angle of Burners of Homemade 300MW Boiler,Regulate the Reheat Steam Temperature[J].Electric Power,2003,36(4):68-70
[5]刘强.定功率下喷水减温对机组热经济性影响的数学模型[J].中国电机工程学报,2008,28(26):19-23.LIU Qiang.Mathematical Model for the Influence of Spray Desuperheating on Thermal Economy Under Conditions of Constant Power Output[J].Proceedings of the CSEE,2008,28(26):19-23
[6]华志刚,吕剑虹,张铁军.状态变量-预测控制技术在600MW机组再热汽温控制中的研究与应用[J].中国电机工程学报,2005,25(12):103-107HUA Zhigang,LV Jianghong,ZHANG Tiejun.Research and Application of State Variable-Predictive Control in600mw Unit Reheater Temperature Control System[J].Proceedings of the CSEEF 2005,25(12):103-107
[7]李勇,王超.再热蒸汽温度变化对核电汽轮机运行经济性的影响[J].核动力工程,2011,32(5):133-137LI Yong,WANG Chao.Effect of Change of Reheat Steam Temperature on Operation Economy of Nuclear Steam Turbine[J].Nuclear Power Engineering,2011,32(5):133-137
[8]韩英昆,孟祥荣,沃德江.单元机组再热汽温控制系统[J].自动化应用,2010(10):13-16HAN Yingkun,MENG Xiangrong,WO Dejiang.Analysis on the Effect of Heat Vapor Temperature Adjustment on the Thermal Efficiency of Circulating Heat[J].Automation applications,2010(10):13-16
[9]王朝阳,李冰心,苗国耀,等.660 MW机组不同变负荷速率下瞬态过程的能耗特性研究[J].中国电机工程学报,2017(19):5665-5673WANG C}aoyang,LI Bingxin,MIAO Guoyao,et al.Study on Energy Consumption Characteristics During Transient Processes of a 660 MW Coal-fired Power Plant With Different Load-Variation Rates[J].Proceedings of the CSEE,2017(19):5665-5673
[10]Wang C,Liu M,Li B,et al.Thermodynamic Analysis on the Transient Cycling of Coal-Fired Power Plants:Simulation Study of a 660 MW Supercritical Unit[J].Energy,2017,122:505-527
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