立式U形管自然循环蒸汽发生器循环倍率近似计算方法研究

Study on Approximate Calculation Method of Circulation Ratio for Vertical U-tube Natural Circulation Steam Generator

循环倍率是保证核电厂立式U形管自然循环蒸汽发生器稳定运行的重要参数。为了近似方便地计算该值,本文在归纳、整理公开出版物中关于蒸汽发生器自然循环相关计算公式的基础上,以典型结构的立式U形管自然循环蒸汽发生器为例,提出一套简单完整的蒸汽发生器循环倍率近似计算方法。在已知蒸汽发生器部分结构参数与少量热工参数的基础上,可按步骤方便地对蒸汽发生器驱动压头与流动阻力进行近似计算,并求解出循环倍率。计算选取的公式均来自公开出版物,仅需水物性表即可完成计算。采用该近似方法的循环倍率求解结果与采用专业蒸汽发生器热工计算程序的循环倍率求解结果相比误差较小。

In order to calculate circulation ratio approximately and conveniently,which is a key parameter for stable operation of vertical U-tube natural circulation steam generator in nuclear power plant,a simple and complete approximate calculation method is proposed.The calculation method is developed by summarizing the calculation formulas related to the natural circulation of the steam generator in the public publications.Taking a vertical U-tube natural circulation steam generator with typical structure for example,given some structural parameters and a few thermal parameters of the steam generator,the circulation driving head and the circulation loop pressure drop of the steam generator can be calculated approximately step by step,and then the circulation ratio can be solved.The formulas adopted for the calculation are from public publications,and the calculation can be completed with the help of water property table.The error of the calculation result of the circulation ratio by this approximate method is relatively small compared with that given by professional steam generator thermal calculation program.