凝汽器高背压改造后性能的试验研究与分析  

Test and Analysis on Performance of Condenser after High Back Pressure Reconstruction for Heat Supply

作　　者：王学栋[1] 成渫畏 郑威[1] 

机构地区：[1]山东电力集团公司电力科学研究院,济南250002 [2]华电国际山东分公司安生部,济南250014

出　　处：《汽轮机技术》2013年第2期135-138,共4页Turbine Technology

摘　　要：介绍了150MW高背压供热机组,凝汽器高背压供热改造的内容。由机组高背压供热改造后,凝汽器高、低背压运行的试验数据,计算了凝汽器在两种运行状态下的性能指标。高背压供热工况下,凝汽器端差较小,为2.354℃;3个低背压凝汽工况,凝汽器端差为6.535℃、5.358℃、5.148℃,经循环水流量和进水温度修正后的凝汽器端差为8.721℃、7.179℃、6.724℃,都高于通常的凝汽器设计端差4℃和改造前的数值,改造后的总体传热系数为2.183kW/(m2.℃),小于改造前的平均值3.388kW/(m2.℃)。凝汽器高背压改造后,满足常年安全运行的要求,但性能指标没有达到设计值,也低于改造前的数值,125MW工况下,凝汽器改造后的背压比改造前上升近0.9kPa。The condenser reconstruction of 150MW unit for meeting the need of high back pressure circulating water heat supply is introduced. Economical characteristics of the reconstructed condenser are calculated using the experimental data of high and low back pressure operational conditions. The results show that the condenser terminal temperature difference is 2. 354℃ which is lower than design value 4℃ ,when the unit operating in high pressure mode. As the unit operating in low pressure mode, the condenser terminal temperature difference is 6.535℃℃, 5. 358℃, 5. 148℃, the corrected condenser terminal temperature difference is 8. 721℃, 7. 179℃, 6.724℃ ,both of them are all higher than design value 4℃ and that of condenser before reconstruction. The whole heat-transfer coefficient of condenser is 2. 183kW/（ m^2· ℃ ） lower than the value 3. 388kW/（m^2· ℃ ） before reconstruction. The analysis shows that, by reconstruction of the condenser,the safety can be guaranteed during the whole year. But the economical characteristics do not reach to design value, being lower than that of condenser before reconstruction. At 125MW power load condition, the condenser back pressure after reconstruction is 0.9kPa higher than that before reconstruction.

关 键 词：汽轮机组 高背压改造 凝汽器改造 循环水供热 

分 类 号：TK262[动力工程及工程热物理—动力机械及工程]