液化天然气(LNG)加注机的设计与开发

Design and Development of the LNG Dispenser

摘要: 液化天然气(LNG)作为一种新兴的高效、清洁能源，在我国的城市公交和出租车辆上逐渐得到广泛使用。针对当前LNG加注站在给车辆加液的过程中，需要精确的计费、监控和管理，设计了一种用于LNG加注站的加注机，构思了加注机软硬件的整体结构，完成了电源电路、主控电路、回路电路、显示电路的设计制作，实现了基于MODBUS协议下MCU与质量流量计之间的485通信，并简单介绍了整个系统在加注过程中的工作流程。经现场调试该加注机成功实现了LNG加注的所有操作，预冷过程迅速，加注平稳，计量准确，具有广阔的应用前景。

Abstract: Be seriously challenged, as the world’s energy problems have become increasingly prominent, the traditional energy structure in China, at the same time, global warming, air pollution and other environmental issues also threaten our homes, building a sustainable social atmosphere to become the current trend of the times. Liquefied natural gas (LNG) as a new kind of efficient, clean energy, gradually been widely used in China’s urban bus and taxi. According to LNG stations need accurate billing, monitoring and management when the vehicles add LNG, designed a kind of LNG dispenser which used in the LNG station, and developed the overall structure of the LNG dispenser hardware and soft-ware, completed the power circuit, control circuit, the loop circuit, display circuit, achieved the 485 communication between the MCU and mass flow meter in the MODBUS protocol, and a brief introduction of the workflow of the entire system in the filling process. After the commissioning, the machine completed all operations, with pre-cooling process is quick, smooth filling, accurate measurement, and showed wide application prospects.