基于实时参数的LNG加气站卸液流程优化

Optimization of Unloading Process for LNG Refueling Station Based on Real-Time Parameters

从液化天然气的低温特性出发,针对LNG加气站在卸液过程中存在的卸车慢、损耗和能耗大、安全环保风险多等诸多问题,基于卸液过程中压力温度实时参数的变化,全面分析了卸车的损耗、时间、能耗和工艺等指标,探讨优化了卸液流程。结果表明:损耗下降了50%以上,卸车时间由原来的平均每车4 h,缩短为2. 5～3. 0h,潜液泵的运行时间大幅减少,节电约30%。如果通过信息化系统全方位采集运转参数、自动控制优化操作,硬件设备升级,将更好地实现卸得干净、快捷、安全、节能和环保的目标。

Aiming at the problems of slow unloading,excess remaining liquids in tank truck and large loss existing in conventional unloading mode of LNG refueling station,according to the low temperature characteristics of LNG refueling station,based on the real-time parameters and process of unloading,different unloading modes are adopted by comparing different pressures,temperatures and processes,to reasonably optimize and control the unloading process of storage tanks and tank trucks,minimize the heat exchange between LNG and the external environment, and maximize the use of internal pressure,temperature and liquid level differences between tanks and tankers to provide unloading power. The purposes including reasonable design,standardized operation, improved work efficiency,energy saving and environmental protection can be achieved by optimizing the receiving and unloading process of gas refueling station.