600 MW 机组凝汽器喉部加装挡板数值模拟

摘要

Considering low pressure heater and additional fluid such as inner small turbine exhaust steam in a 600 MW unit, the internal flow field of condenser throat is investigated by using the FLUENT software ,and a method of installing baffles on the top of low pressure heater No .7 and 8 is proposed to improve the internal flow field .The calculation results shows that:after the installation of baffles , the steam flow uniformity coefficient of condenser throat outlet increased by 4.1%, the average steam resistance reduced 9.4 Pa, then the flow field distribution of the condenser becomes better , and the heat transfer effect of the condenser is improved .%以某600MW机组为例，在考虑内置低压加热器和小汽轮机排汽等附加流体情况下，采用FLUENT软件对凝汽器喉部流场进行数值模拟，提出了在7号、8号低压加热器顶部加装挡板的方法。计算结果表明：凝汽器喉部出口蒸汽流动均匀性系数最高提高了4．1％，平均汽阻减小了9．4Pa，改善了凝汽器内的流场分布，提高了凝汽器换热效果。