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文章以300MW汽轮机凝汽器为例,通过热力试验分析出凝汽器的节能潜力,凝汽器喉部布置有低压加热器及相应抽汽管道、低压旁路蒸汽减温减压装置以及若干疏水系统等,其中内置低压加热器体积庞大,是造成喉部汽阻和喉部出口流场不均匀的主要设备。文章重点对改善凝汽器的喉部出口流场进行分析研究,通过数值模拟得到该凝汽器壳侧速度场分布,采用喉部导流措施将蒸汽流向往低加下方引导,可降低喉部出口截面的流场不均匀性,同时还可以改善冷却管的汽流激振特性,采取这样的技术措施后,在额定工况将可以提高凝汽器真空度约0.5kPa左右。
Taking the 300MW steam turbine condenser as an example, the energy saving potential of the condenser is analyzed through the thermal test. The low pressure heater and the corresponding extraction pipe are arranged in the throat of the condenser. The low pressure bypass steam temperature reducing and pressure reducing device as well as some hydrophobic System, etc., in which the built-in low-pressure heater is bulky and is the main equipment that causes the throat vapor resistance and the throat outlet flow field to be uneven. The paper focuses on the analysis of the condenser outlet flow at the throat of the condenser. By numerical simulation, the velocity field distribution of the condenser shell side is obtained. The throat flow direction is adopted to guide the steam flow to the lower and lower, which can reduce the throat Outlet cross-section of the flow field is not uniform, but also can improve the cooling tube flow excitation characteristics, to take such technical measures, the rated conditions will be able to improve the condenser vacuum of about 0.5kPa or so.