Purification device for preparing pure nitrogen from industrial nitrogen

The utility model relates to a purification device for preparing pure nitrogen by using industrial nitrogen, which comprises a first industrial nitrogen delivery pipe, the first industrial nitrogen delivery pipe is provided with a low-pressure buffer tank, a nitrogen compressor, a first one-way valve, an electric heater and a high-pressure buffer tank, and the high-pressure buffer tank is sequentially communicated with a carbon powder storage tank, a variable-temperature gas delivery pipe and a first adsorption device. The first adsorption device comprises a molecular sieve adsorption tank, a molecular sieve layer arranged in the molecular sieve adsorption tank and a pure nitrogen conveying pipe arranged on the molecular sieve adsorption tank, a first conveying pipe is arranged on the molecular sieve adsorption tank, and a first high-temperature nitrogen conveying pipe is arranged between the first conveying pipe and the high-pressure buffer tank; and first temperature sensors are arranged on the low-pressure