外置蒸汽冷却器和0号高压加热器节能分析
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摘要
为了探讨0号高压加热器和外置蒸汽冷却器在不同布置方式、不同负荷和不同外置蒸汽冷却器给水质量流量下的节能效果,利用Ebsilon软件对某660 MW机组进行分析。结果表明:当系统增设0号高压加热器时,75%THA和50%THA负荷下,给水温度分别提高23.2 K和21 K,热耗分别降低约31.2 kJ/(kW·h)和35.8 kJ/(kW·h);当利用三抽蒸汽过热度加热给水时,进入省煤器的给水温度可提升约3.2 K,100%THA、75%THA和50%THA负荷下的热耗分别降低10.7 kJ/(kW·h)、10.8 kJ/(kW·h)和13.7 kJ/(kW·h);同时增设0号高压加热器和外置蒸汽冷却器时,在75%THA和50%THA负荷下,热耗分别降低约40.6 kJ/(kW·h)和48.2 kJ/(kW·h),机组在低负荷下经济性有所提高。
To study the energy saving effectiveness by the addition of No.0 HP heater and external steam cooler in a 660 MW unit, an analysis was conducted using Ebsilon software under different arrangements of the No.0 HP heater and external steam cooler, different unit loads and different feed water flow rates in the external steam cooler. Results show that when only No.0 HP heater is added, the final feed water temperature would be increased by 23.2 K and 21 K respectively under 75%THA and 50%THA condition, and the heat rate of unit would be reduced by about 31.2 kJ/(kW·h) and 35.8 kJ/(kW·h) accordingly. When only external steam cooler is added, the final temperature of feed water entering the economizer could be increased by 3.2 K, and the heat rate would be reduced by 10.7 kJ/(kW·h), 10.8 kJ/(kW·h) and 13.7 kJ/(kW·h) correspondingly under 100%THA, 75%THA and 50%THA condition. When both the No.0 HP heater and external steam cooler are added simultaneously, the heat rate would be reduced by 40.6 kJ/(kW·h) and 48.2 kJ/(kW·h) respectively under 75%THA and 50%THA condition, indicating that the unit economy could be improved under low load conditions with both No.0 HP heater and external steam cooler installed.
To study the energy saving effectiveness by the addition of No.0 HP heater and external steam cooler in a 660 MW unit, an analysis was conducted using Ebsilon software under different arrangements of the No.0 HP heater and external steam cooler, different unit loads and different feed water flow rates in the external steam cooler. Results show that when only No.0 HP heater is added, the final feed water temperature would be increased by 23.2 K and 21 K respectively under 75%THA and 50%THA condition, and the heat rate of unit would be reduced by about 31.2 kJ/(kW·h) and 35.8 kJ/(kW·h) accordingly. When only external steam cooler is added, the final temperature of feed water entering the economizer could be increased by 3.2 K, and the heat rate would be reduced by 10.7 kJ/(kW·h), 10.8 kJ/(kW·h) and 13.7 kJ/(kW·h) correspondingly under 100%THA, 75%THA and 50%THA condition. When both the No.0 HP heater and external steam cooler are added simultaneously, the heat rate would be reduced by 40.6 kJ/(kW·h) and 48.2 kJ/(kW·h) respectively under 75%THA and 50%THA condition, indicating that the unit economy could be improved under low load conditions with both No.0 HP heater and external steam cooler installed.
引文
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[3] 乔加飞, 郝卫, 刘颖华, 等. 基于零号高加的宽负荷高效回热技术研究[J]. 中国煤炭, 2014, 40(增刊1): 228-231. QIAO Jiafei,HAO Wei,LIU Yinghua,et al. Research on wide-load high efficient regeneration technology based on NO. 0# HP heater[J]. China Coal, 2014, 40(Sup1): 228-231.
[4] 夏晓华, 杨宇, 范世望, 等. 1 000 MW二次再热汽轮机带外置蒸冷器方案能损分析[J]. 发电设备, 2015, 29(3): 160-163. XIA Xiaohua, YANG Yu, FAN Shiwang, et al. Heat consumption analysis for the 1 000 MW double-reheat steam turbine with external steam cooler[J]. Power Equipment, 2015, 29(3): 160-163.
[5] 周璐瑶, 徐钢, 白璞, 等. 1 000 MW超超临界机组回热抽汽过热度多种利用形式的热力学分析[J]. 动力工程学报, 2017, 37(6): 495-500. ZHOU Luyao, XU Gang, BAI Pu, et al. Thermo dynamic analysis on the superheating degree utilization modes of 1 000 MW ultra-supercritical units[J]. Journal of Chinese Society of Power Engineering, 2017, 37(6): 495-500.
[6] 王存新, 吴志祥, 宁志. 1 000 MW机组回热系统优化的技术经济性分析[J]. 节能, 2016, 35(7): 41-44. WANG Cunxin, WU Zhixiang,NING Zhi. Technical and economic analysis of regeneration system of 1 000 MW unit[J]. Energy Conservation, 2016, 35(7): 41-44.