伺服电子密度计混合式储罐自动计量系统的应用

Design and Application of Hybrid Tank Automatic Metering System with Servo Electronic Densitometer

针对当前国内油品计量采用混合式油罐测量方法存在的测量液位3m以下的密度误差较大的问题,研究探索了用原有伺服液位计加伺服在线密度计构成的伺服在线电子密度计混合式储罐自动计量系统解决方案。经某油库近半年的试用和改进,取得满意效果。与人工计量相比,该系统液位偏差在±3mm以内;标准偏差在±0. 5kg/m^3以内;温度偏差在±0. 3℃以内。实现了对罐内油品液位、温度、水位的高精度在线采集和计量,测试结果符合自动计量的精度要求。

Based on the brief introduction of the form and advantages and disadvantages of the domestic and foreign oil product delivery,in view of the large error of oil density when the measuring liquid level below 3 m using hybrid tank measurement method in domestic oil metering,a hybrid measurement system with a servo on-line electronic device consisting of an original servo liquid level meter and an on-line densitometer is proposed. After a half year trial in an oil depot,satisfactory results were obtained. Compared with manual measurement,the liquid level deviation of the system is less than 3 mm,the density deviation is within 0. 5 kg/m^3,and the temperature deviation is about 0. 2℃. Using the system,the average density measurement of oil in the tank,the fixed point measurement,the oil density monitoring and the real-time measurement of the oil density at the bottom of the oil tank can be obtained,and the oil delivery in accordance with the actual density can be realized.