Energy-saving type nitrogen making machine heat exchange system

The utility model relates to the field of air separation, in particular to an energy-saving nitrogen making machine heat exchange system which comprises an adsorber, a common oxygen tower, an adsorption tank, a heat exchanger, an expansion machine, a high-pressure nitrogen tower, a low-pressure nitrogen tower, a subcooler and a pipe network. A pure nitrogen pipe is arranged in the adsorber; a waste nitrogen pipe, a liquid oxygen storage tank and a pure oxygen storage tank are arranged in the ordinary oxygen tower; the pure nitrogen pipe, the waste nitrogen pipe, the liquid oxygen storage tank, the pure oxygen storage tank, the adsorption tank, the heat exchanger, the expansion machine, the high-pressure nitrogen tower, the low-pressure nitrogen tower and the subcooler are communicated with one another through the pipe network. According to the invention, the utilization rate of gas is improved. 本申请涉及空气分离领域，尤其是涉及一种节能型制氮机换热系统，包括吸附器、普氧塔、吸附罐、换热器、膨胀机、高压氮塔、低压氮塔、过冷器和管网；所述吸附器内设置有纯氮气管，所述普氧塔内设置有污氮气管、液氧储罐和纯氧储罐；所述纯氮气管、所述