基于分区密度补偿的稳压器液位测量研究

针对稳压器底部电热元件进行加热时，稳压器中上部和底部温度差异较大，导致传统稳压器差压法液位存在测量误差大的问题，提出了一种基于分区密度补偿的稳压器液测量方法。首先根据实际情况将稳压器分为饱和区和非饱和区，饱和区为饱和蒸汽所在区域，利用测量得到的温度对饱和蒸汽密度进行补偿；非饱和区域为介质水所在的区域，利用非饱和区域平均温度对介质水密度进行补偿。其次在稳压器饱和区和非饱和区，建立基于最小二乘法的多项式拟合模型，进行密度变量补偿，进而结合冷水段密度量进行液位计算。最后在实验装置上进行实验，并和基准液位进行比较，实验表明本文所提出的稳压器液位测量方法能够得到可靠的测量结果，因此本方法能够广泛应用于核工业等工业领域中压力容器液位测量。 

Research on Pressurizer Level Measurement Based on Sub-regional Density Compensation

In view of the large temperature difference between the upper part and the bottom of the pressurizer when the electric heating element heats the pressurizer, which leads to the large measurement error of the liquid level measurement of the traditional pressurizer differential pressure method, a pressurizer liquid level measurement method based on sub-regional density compensation is proposed. Firstly, according to the actual situation, the pressurizer is divided into saturated area and unsaturated area. The saturated area is the area where the saturated steam is located. The measured temperature is used to compensate the saturated steam density; the unsaturated area is the area where the medium water is located, and the average temperature of the unsaturated area is used to compensate the medium water density. Secondly, a polynomial fitting model based on the least square method is established in the saturated and unsaturated areas of the pressurizer to compensate the density variable, and then the liquid level is calculated by combining the density of the cold water section. Finally, the experiment is carried out on the experimental device and compared with the reference liquid level. The experiment shows that the pressurizer liquid level measurement method proposed in this paper can obtain reliable measurement results, so this method can be widely applied to pressure vessel liquid level measurement in industrial fields including nuclear industry.