Liquid nitrogen pressurization system

The utility model belongs to the technical field of air separation, and provides a liquid nitrogen pressurization system which comprises a low-pressure tower and a high-pressure tower, the liquid outlet end of the low-pressure tower is connected with a plurality of pressurization devices in parallel through pipelines, the liquid outlet ends of the pressurization devices are connected with the high-pressure tower, and liquid nitrogen flows into the high-pressure tower after being pressurized by the pressurization devices from the low-pressure tower; the pressurizing device comprises a pressurizing tank and a heater, the pressurizing tank is connected with the heater in series, liquid nitrogen is vaporized by the heater and enters the pressurizing tank to increase the pressure in the pressurizing tank, and then the pressure of the liquid nitrogen in the pressurizing tank is increased; according to the liquid nitrogen pressurizing and conveying system, pressurizing and conveying of liquid nitrogen can be achieve