TPSA Regeneration Model Application In Purification System Of Air Separation Unit

The TPSA (Temperature and Pressure Swing Adsorbent) regeneration modelapplication in purification system of ASU (Air Separation Unit) plant was mainlyinvestigated in the thesis. For cryogenic method air separation unit, the impurities arewater, carbon dioxide, and hydrocarbon. In the low temperature ambient, the water andcarbon dioxide will be solid, which will block the piping. The hydrocarbon concentratedin reboiler may lead to explosion. These impurities are removed by purification system.TPSA is a new model purification system, which is different from TSA (TemperatureSwing Adsorbent) model and PSA (Pressure Swing Adsorbent) model. The thesisdetailed introduced the TSA, PSA and TPSA theory, running model in plant operation,adsorbent category. According to the TSA and PSA theory, TPSA theory was modifiedand improved. The TSA adsorbed under the low temperature and desorbed under the hightemperature. The PSA adsorbed under the high pressure and desorbed under the lowpressure. To remove the impurity of air in the material, the TSA desorption needs hightemperature waste nitrogen to purge. The temperature of waste nitrogen from main heatexchanger is about15℃and needs to be heated by electrical heater. For the large ASU,the heat power is huge. The TPSA based on TSA and PSA combined the actual ASUoperation to decrease the heat time meaning heat power.