Technology Research Of Solid Amine Fiber For CO₂Removal In Space Station

Solid Amine Fiber （SAF） technology has a promising prospect in CO₂removal inconfine space. To promote the application of SAF technology in Space Station, the mainworks of the research were as follows:1) Theoretical analysis. Considering the environment of3-persons Space Station, tasks ofthe development for CO₂capture device on the basis of Solid Amine Fiber were discussed,which may include: reaction conditions,reactor design, heating and water recycling process.2) Device design parameters were studied. In the temperature range of30⁹0℃，time1⁶min，absolute pressure100⁷00Pa,the regeneration efficiency of SAF desorption ofCO₂by vacuum were16.63⁸5.47%,32.11⁷2.30%,46.42⁷8.02%repectively,as single factorwas investigated and the rest took3min,400Pa,60℃in turn. Through the orthogonalexperiments,the significance sequence according to the effect of various factors on thereaction was: temperature, absolute pressure, time. The optimum operating conditions were:inadsorption stage,the water content of SAF was100%,bulk density of0.15g/cm3,time of10min;In regeneration stage,the temperature was70℃、 time of3.5min,absolute pressure of300Pa,while the regeneration efficiency was82.32%; The heating supply is difficult for SAF;The water loss was about26wt%.3) Device design and process selection.Combined with the optimum conditions as wellas the environment of Space-Station cabin, that is25℃,CO₂initial concentration0.7%,exhaling CO₂0.69g/min one person, a reactor unit was designed. Using that, the methods ofheating and recycling water were investgated. Conclusion:coating far-infrared radiationcoating in the reactor inner wall or doping aluminum fiber had no obviously help to the teattransfer, but landfilling heating wire in SAF uniformly can improve the heating. Most of thewater vapor producing during the reaction could be separated by bicomponent desiccant ofalumina and3A molecular sieve or-20℃freeze-dried using ice-salt bath.4) Device evaluation. SAF can absorb0.86mmol CO₂each gram. Adsorptionperformance of SAF had no significant change after multiple circulation. SAF had obviousadvantages in the volume, weight and amount of materials.