摘要
基于冷却塔进塔风速软测量原理和出塔水温实时测量数据,提出一种出塔水温计算新方法,对某电厂300 MW机组的出塔水温进行计算并与实测结果进行对比,结果表明:出塔水温的在线计算结果与实测结果最大偏差约2%,该方法可准确计算出塔水温。利用出塔水温计算新方法进行了冷却塔变工况特性研究,并绘制了冷却塔变工况特性曲线。通过对影响出塔水温的外界气象参数进行敏感性分析可知:大气压力对出塔水温的影响很小,可忽略。由冷却塔变工况特性曲线可知:出塔水温随着干球温度、相对湿度的增大而增大,且相对湿度对出塔水温的影响随干球温度的增大而增大。
Based on the theory for soft measuring the air speed entering into a cooling tower and the real-time measured data of temperature of water outgoing from the cooling tower,proposed was a new method for calculating the temperature of water outgoing from the tower. The temperature of water outgoing from a cooling tower of a 300 MW unit in a power plant was calculated and compared with the actually measured results. It has been found that the maximum deviation between the on-line calculation result and the actually measured one is about 2%. The method in question can accurately calculate the temperature of water outgoing from a tower. The method under discussion was used to study the off-design operating condition characteristics of a cooling tower and plot the curves of its off-design operating condition characteristics. It has been known from a sensitivity analysis of the meteorological parameters from the outside world influencing the temperature of water outgoing from the tower that the atmospheric pressure has very little influence on the temperature of water outgoing from the tower and can be neglected. It has been also learned from the offdesign operating condition characteristics of the tower that the temperature of water outgoing from the tower will increase with an increase of the dry-ball temperature and relative humidity and the influence of the relative humidity on the temperature of water outgoing from the tower will also increase with an increase of the dry-ball temperature.
出处
《热能动力工程》
CAS
CSCD
北大核心
2014年第3期326-332,347-348,共7页
Journal of Engineering for Thermal Energy and Power
基金
国家自然科学基金资助项目(50979029
51209073)
关键词
火电机组
循环冷却水系统
冷却塔
出塔水温
气象条件
thermal power generator unit,circulating cooling water system,cooling tower,temperature of water outgoing from a cooling tower,weather condition
