在用多(duo)(duo)孔(kong)性固(gu)體(ti)物(wu)質(zhi)處理流(liu)體(ti)混(hun)合物(wu)時(shi),流(liu)體(ti)中的某一組(zu)(zu)分或(huo)某些(xie)組(zu)(zu)分可被吸(xi)表面(mian)并濃集其(qi)上(shang),此現象稱為吸(xi)附(fu)。吸(xi)附(fu)處理廢氣時(shi),吸(xi)附(fu)的對象是氣態污染物(wu),氣固(gu)吸(xi)附(fu)。被吸(xi)附(fu)的氣體(ti)組(zu)(zu)分稱為吸(xi)附(fu)質(zhi),多(duo)(duo)孔(kong)固(gu)體(ti)物(wu)質(zhi)稱為吸(xi)附(fu)劑。
固(gu)體表(biao)面吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)了(le)吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)質(zhi)后,一(yi)部被吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)的吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)質(zhi)可(ke)從吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)劑表(biao)面脫離,此現附(fu)(fu)(fu)。而(er)當吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)進行一(yi)段(duan)時間后,由于表(biao)面吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)質(zhi)的濃(nong)集,使(shi)其吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)能(neng)力明顯(xian)下降(jiang)而(er)吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)凈化的要求,此時需(xu)要采用(yong)一(yi)定的措(cuo)施使(shi)吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)劑上已(yi)吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)的吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)質(zhi)脫附(fu)(fu)(fu),以協的吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)能(neng)力,這個過程稱為吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)劑的再生。因(yin)此在實際吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)工(gong)程中(zhong),正是利(li)用(yong)吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)一(yi)再生一(yi)再吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)的循(xun)環(huan)過程,達到除去廢(fei)氣中(zhong)污染物質(zhi)并(bing)回(hui)收廢(fei)氣中(zhong)有用(yong)組分。