Nitrogen sealing protection device for storage tank

The utility model relates to a storage tank nitrogen seal protection device, which comprises a storage tank, a gas inlet pipeline, a first regulating valve, at least one pressure sensor, an emptying valve, a gas outlet pipeline, a second regulating valve and a controller, each storage tank corresponds to one gas inlet pipeline and one gas outlet pipeline, and the emptying valve is arranged on the storage tank and is directly communicated with the storage tank. The air inlet pipe and the blowoff valve are relatively independent; therefore, the situation that the air inlet pipeline is communicated with the outside through the emptying valve is avoided, at least one pressure sensor is arranged for each storage tank, and the pressure sensor is used for detecting the pressure value in the storage tank; the controller controls the action of the first regulating valve, the second regulating valve or the blowoff valve according to the pressure value detected by the pressure sensor to supplement or exhaust gas, so tha