Circular inflation modified atmosphere grain storage device and method using device

The invention discloses circular inflation modified atmosphere grain storage device and method using the device. The device comprises a nitrogen inflation system, a nitrogen preparation circulation system, a grain barn system and an automatic control system. The nitrogen inflation system comprises a nitrogen inflation/preparation unit. The circulation system comprises a nitrogen preparation circulation unit and a circulation pipeline. The grain barn system comprises a barn body, a grain pile, a grain face film gasbag disposed above the grain pile, and a grain storage ventilation pipeline, a nitrogen inflation pipeline, a circular nitrogen inflation pipeline and a gas outlet pipe disposed in the grain pile. The automatic control system comprises a central processor, a nitrogen inflation/preparation unit control module, a nitrogen preparation circulation unit control module, a pressure sensor, an oxygen concentration sensor, and a grain pile temperature/humidity sensor. By cooperative operation of the nitrogen inflation system and the circulation system, the device and the method greatly improve working efficiency, save energy consumption, guarantee grain storage quality, and achieve significant pest killing effect.