| 摘要 |
<p>PROBLEM TO BE SOLVED: To solve the problem that the nitrogen gas producing efficiency of conventional nitrogen gas generating apparatus and the concentration of the produced nitrogen gas are obliged to be lowered because that the amount of compressed air to be supplied to an adsorption tank must be reduced when the moisture in a drier of a compressor is discharged in the condition that the compressor and the adsorption tank are communicated with each other and the compressed air is supplied to the adsorption tank. SOLUTION: The nitrogen gas producing efficiency is prevented from being lowered by discharging the moisture accumulated in the drier 4 by opening a drain discharging valve 4a of the drier 4 during the step to equalize the pressure of the compressor 3 to those of the adsorption tanks 1, 2 in the condition that the compressor 3 is blocked from the tanks 1, 2 by closing air supplying valves 8, 9 so that the pressure of each of the tanks 1, 2 is prevented from being lowered during the adsorption and withdrawal steps to produce nitrogen gas.</p> |
