The air storage tank is an important supporting component of the nitrogen generator system, which undertakes the functions of stabilizing system pressure, buffering gas flow, reducing equipment frequent startup and shutdown, and improving nitrogen production stability. Reasonable selection and calculation of the tank volume directly affect the operating efficiency, service life and gas supply stability of the entire nitrogen generation system. If the tank volume is too small, the system pressure fluctuates greatly, the compressor and adsorption tower switch frequently, and the equipment loss is accelerated; if the volume is too large, it will cause unnecessary equipment investment and occupy excessive production space. Therefore, scientific volume calculation and model selection are essential in the system design stage.
The core calculation parameters of the nitrogen generator matching air tank include system maximum gas production, instantaneous gas consumption, working pressure difference, and equipment switching cycle. The conventional volume calculation formula for PSA nitrogen generator air tanks is derived based on gas pressure and volume conversion principles. The basic calculation principle is that the effective storage volume of the air tank can balance the gas supply and consumption difference during the equipment switching cycle, ensuring no pressure drop in the gas supply terminal. In industrial conventional scenarios, the empirical calculation formula is V=Q×T×(P1-P2)/P0, where V is the effective volume of the air tank, Q is the system average gas production, T is the adsorption switching cycle, P1 is the upper limit of working pressure, P2 is the lower limit of working pressure, and P0 is standard atmospheric pressure.
In actual model selection, it is also necessary to comprehensively adjust parameters according to the actual working conditions. For working conditions with stable gas consumption and continuous operation, calculate according to the standard formula and select the tank volume with a 10% margin; for intermittent gas consumption and large instantaneous gas demand scenarios, appropriately increase the tank volume to avoid instantaneous pressure drop. In addition, the pressure grade of the air tank must match the maximum working pressure of the nitrogen generator system, and it is necessary to select a pressure vessel with a national standard certification, equipped with safety valves, pressure gauges, and drainage devices. After model selection and installation, conduct pressure resistance and air tightness tests to ensure that the air tank can stably support the long-term operation of the nitrogen generator system.
