Research on On-Line Monitoring and Evaluation Method of Thermal Insulation Performance of Vehicle LNG Gas Cylinder

Abstract

Driven by energy structure optimization, environmental pollution control and climate change constraints, the development of new energy vehicles has become a global trend, LNG (Liquefied Natural Gas) vehicles whose key energy storage equipment is the low-temperature insulated gas cylinders are one of the most important components. The feasibility of online health monitoring of low-temperature insulated gas cylinders for vehicles is verified in this paper and an online monitoring device for vehicle gas cylinder thermal insulation performance parameters is designed and implemented. Together with the wireless communication technology and the online monitoring device, the remote management platform for gas cylinder safety and health can be constructed. Through experiments, the static evaporation rate and holding time of low-temperature insulated gas cylinders with different filling rates and vacuum degrees were measured and the pressure boost curve before and after vacuum loss was obtained. By analyzing the experimental data, it is found that the rate of pressure rise of the cylinder is different before and after vacuum loss, so the safety condition of the cylinder can be evaluated. Compared with traditional vehicle gas cylinder inspection, it can save inspection time by monitoring the rate of pressure rise instead, which can realize the improvement of the efficiency of gas cylinder inspection and the timeliness of equipment risk warning.