Nitrogen circulation drying system applied to spray drying of high-molecular polymer emulsion

The invention relates to a nitrogen circulating drying system applied to spray drying of high-molecular polymer emulsion, which comprises a drying tower, a dust remover, a circulating nitrogen compressor, a cooling cooler, a gas-liquid separator and a heating heat exchanger which are sequentially communicated through a circulating pipeline and form a circulating loop, a purge gas output port is formed in the circulating pipeline at the outlet of the gas-liquid separator; and a first valve and a second valve are respectively arranged at the nitrogen input port and the purge gas output port of the circulating pipeline. By arranging the nitrogen input port, nitrogen can be filled into the circulation pipeline for circulation, so that the circulation pipeline is filled with dry nitrogen, and the risks of traditional hot air dry dust and VOCs gas explosion are avoided. A small amount of purge gas is discharged through the purge gas output port, so that the nitrogen quality of the nitrogen circulation system can be