基于高精度称重传感器的LNG加气站计量系统设计

Design of LNG filling station measurement systembased on high precision weighing sensor

目前在LNG加气站运行过程中,有三个需要精确计量的环节,即进货计量、储存计量和加注计量。但是由于计量技术的限制,三个环节的计量都存在着一些问题。进货计量使用非现场交接的过地磅方式,存在盲点。储存计量只有压差式液位计,精度只适合作安全监测,不能达到计量管理要求,存在模糊点。加注计量虽然采用了质量流量计,但是存在着技术复杂、成本高、冷能损失大,存在痛点。本方案通过运用高精度称重传感器,搭建一套LNG储罐称重系统,完成LNG进货、储存和加注三个环节的计量工作。本系统由传感器和信号传输与管理软件组成,精度可以达到0.1%甚至更高。一套系统可以实现LNG进货、存储和加注三个环节的计量。

There are three sections needing precision measurements in the operation of LNG filling station,which are purchase measurement,storage measurement and filling measurement. Due to the limitation of measurement technique,there still remain some problems in these sections. Offsite Loadometer is used in the purchase section,so there are blind spots. In storage measurement,there is only pressure differential type liquid level meter available,whose accuracy is only suitable for safety monitoring,so it can not meet the requirements of measurement management and ex-K7mm〗 ists some fuzzy points. Although mass flowmeter is applied in the filling measurement,there are pain points owing to its complex technology,high cost and big cold energy loss. By using high precision weighing sensor,this program aims to build a weighing system of LNG tank and complete the measurements in LNG purchase,storage and filling sections.The system consists of sensors and signal transmission and management software,its accuracy can reach 0.1% or even higher. This system is all- in- one solution which can achieve all measurements in LNG purchase,storage and filling section.