基于多极板电容传感器测量原油含水率的研究

Research of measuring containing water ratio in crude oil based on multi-electrode capacitance sensor

设计了测量原油含水率的多极板式电容传感器及测量电路;建立了多极板式电容传感器测量原油含水率的数学模型,得到了原油含水率变化量与多极板式电容传感器等效电容变化量之间的函数关系。进行了五极板式电容传感器和单极板式电容传感器测量油水混合物含水率的对比实验。实验结果表明采用五极板式电容传感器测量油水混合物的含水率,相对于采用单极板式电容传感器测量油水混合物的含水率的测量精度有大幅度的提高;而且采用五极板式电容传感器测量油水混合物的含水率,无论是在低含水率端还是在高含水率端其测量结果都比较稳定。

A Multi--electrode capacitance sensor for measuring containing water ratio in crude off and its circuit was designed. The multi-electrode capacitance sensor was designed for the structure of combining. By setting up the mathematic model of the measuring method, the function of the changing rate of containing water ratio in crude off and the equivalent capacitance of multi-electrode capacitance sensor were achieved. An experiment to contrast the measuring containing water ratio in crude oil with pent-electrode capacitance sensor and mono-electrode capacitance sensor has been carried out and proved that comparing with the result of experiments, the precisions of fifth-electrode capacitance sensor in measuring the containing water ratio in crude oil has been greatly improved. Furthermore, whether the containing water ratio in crude oil is higb or low, the measuring result by using fifth- electrode capacitance sensor is stable.