加气站LNG低温储罐液位计的比选及优化方案

Selection and Optimization Scheme of Liquidometer for Low Temperature LNG Storage Tank in Gas Refueling Station

针对目前LNG加气站多采用差压式液位仪无法准确测量液位的情况,为探讨解决此问题的方案,介绍了四种适应LNG低温介质的液位计及其测量原理及组成,比较了优缺点,经过选择,最后提出采用在LNG储罐安装伺服液位计的工艺方案。该方案若实施,可实现LNG储罐的精确计算、安全操作。

Aiming at the situation that the differential pressure type liquidometer can not accurately measure the liquid level in LNG refueling station, the option to solve the problem was explored. The measuring principle and structure of a variety of liquidometers adapt to the low temperature medium LNG were introduced, and the probe type, instrument installation method, matters needing attention, and advantages and shortcomings for various liquidometers were compared. As the result, the processing scheme of installing servo liquidometer in LNG storage tank was finally proposed,by which the accurate measurement and safe operation of LNG storage tank could be realized.