基于EBSILON的蒸汽冷却器节能效果评估
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摘要
基于EBSILON软件建立了外置式蒸汽冷却器(蒸冷器)的节能评估模型,计算分析了其连接方式、分流比例、负荷率、机组类型和容量等对蒸冷器热经济性的影响。结果表明:在并联和加热疏水方案下,蒸冷器的节能效果随分流比例变化呈现"倒V"型趋势;不同布置方案中,负荷越低,节能量越大,而且增设蒸冷器后,负荷越低,与蒸冷器对应的加热器进口蒸汽过热度也越低;不同容量和类型的机组,主蒸汽参数越高,容量越大,蒸冷器的节能效果越好,而且空冷机组由于蒸汽有效焓降偏低,节能效果相对湿冷机组更大。
On the basis of the EBSILON software,an evaluation model for energy saving of steam cooler was established,and the influence of connection mode,bypass ratio,load rate,unit type and capacity on thermal economy of the steam cooler was analyzed.The results show that,in parallel and heating drain scheme,the energy saving of the steam cooler exhibits an "invered V" trend with the change of bypass ratio.In different layout schemes,the energy saving increases with the reducing load rate,and after adding the steam cooler,the superheat of the steam into the preheater which is connected with the steam cooler declines with the load rate.For units with different types and capacities,the energy saving performance of the steam cooler gets better with the main steam parameters and capacity,and because the effective enthalpy drop of the steam is relatively low,the energy saving effect of the air cooling units is greater than that of the water cooling units.
On the basis of the EBSILON software,an evaluation model for energy saving of steam cooler was established,and the influence of connection mode,bypass ratio,load rate,unit type and capacity on thermal economy of the steam cooler was analyzed.The results show that,in parallel and heating drain scheme,the energy saving of the steam cooler exhibits an "invered V" trend with the change of bypass ratio.In different layout schemes,the energy saving increases with the reducing load rate,and after adding the steam cooler,the superheat of the steam into the preheater which is connected with the steam cooler declines with the load rate.For units with different types and capacities,the energy saving performance of the steam cooler gets better with the main steam parameters and capacity,and because the effective enthalpy drop of the steam is relatively low,the energy saving effect of the air cooling units is greater than that of the water cooling units.
引文
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[2]牛中敏,丁一雨.超超临界1 000 MW机组设置外置蒸汽冷却器的热经济性分析[J].热力发电,2011,40(12):67-69.NIU Zhongmin,DING Yiyu.Analysis of thermal economy of installing external steam cooler for ultra-supercritical 1 000MW unit[J].Thermal Power Generation,2011,40(12):67-69.
[3]张秦川,安光辉,苏延安.高压加热器外置式蒸汽冷却器运行异常原因分析及处理[J].热力发电,2008,37(4):54-55.ZHANG Qinchuan,AN Guanghui,SU Yan'an.Cause analysis and disposal of abnormal operation for external arranged steam cooler of the high-pressure heater[J].Thermal Power Generation,2008,37(4):54-55.
[4]郑莆燕,柴国旭,姚秀平,等.凝汽式机组供热改造中回热系统分析[J].热力发电,2013,42(9):16-19.ZHENG Puyan,CHAI Guoxu,YAO Xiuping,et al.Performance analysis on regenerative system after cogeneration transformation of a condensing unit[J].Thermal Power Generation,2013,42(9):16-19.
[5]毛建华.前置式蒸汽冷却器在常规电站中的应用及热效率的改进[J].汽轮机技术,1987(4):1-6.MAO Jianhua.Front steam cooler application in power plant and efficiency improvement[J].Turbine Technology,1987(4):1-6.
[6]李秀云,严俊杰,张春雨,等.外置蒸汽冷却器机组热力系统定量分析方法[J].中国电机工程学报,2001,21(1):36-40.LI Xiuyun,YAN Junjie,ZHANG Chunyu,et al.Economic diagnosis method of thermal system with outer steam cooler[J].Proceedings of the CSEE,2001,21(1):36-40.
[7]阚伟民,宋景慧,周璐瑶,等.超超临界机组增设外置式蒸汽冷却器变工况分析[J].汽轮机技术,2014(1):63-65.KAN Weimin,SONG Jinghui,ZHOU Luyao,et al.Analysis of the variable working condition of installing external steam cooler for ultra-supercritical unit[J].Turbine Technology,2014(1):63-65.
[8]王卫良,李永生.大型汽轮机组2次再热回热系统关键技术研究[J].热力发电,2013,42(11):49-53.WANG Weiliang,LI Yongsheng.Key technologies of double reheat&heat regeneration systems for large scale steam turbines[J].Thermal Power Generation,2013,42(11):49-53.
[9]邵树峰,严俊杰,刘继平,等.二次再热机组热力系统的定量分析方法[J].西安交通大学学报,2003(11):1137-1141.SHAO Shufeng,YAN Junjie,LIU Jiping,et al.Thermo-economics analysis method of thermal system for power unit with double reheat[J].Journal of Xi'an Jiaotong University,2003(11):1137-1141.