在用多(duo)孔性固體(ti)(ti)物(wu)質(zhi)處理流體(ti)(ti)混合物(wu)時,流體(ti)(ti)中的某(mou)一組(zu)分或某(mou)些(xie)組(zu)分可被吸(xi)(xi)(xi)表面并濃集其(qi)上(shang),此現象(xiang)稱為吸(xi)(xi)(xi)附(fu)。吸(xi)(xi)(xi)附(fu)處理廢(fei)氣時,吸(xi)(xi)(xi)附(fu)的對象(xiang)是氣態污染物(wu),氣固吸(xi)(xi)(xi)附(fu)。被吸(xi)(xi)(xi)附(fu)的氣體(ti)(ti)組(zu)分稱為吸(xi)(xi)(xi)附(fu)質(zhi),多(duo)孔固體(ti)(ti)物(wu)質(zhi)稱為吸(xi)(xi)(xi)附(fu)劑。
固體表面(mian)吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)了吸(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)可從吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)劑(ji)表面(mian)脫(tuo)離,此(ci)現附(fu)(fu)(fu)。而(er)當吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)進行一(yi)段時間后,由于(yu)表面(mian)吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)質(zhi)的濃集,使其吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)能力明顯下降而(er)吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)凈化的要(yao)求,此(ci)時需要(yao)采用(yong)一(yi)定的措施使吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)劑(ji)上已吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)的吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)質(zhi)脫(tuo)附(fu)(fu)(fu),以(yi)協(xie)的吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)能力,這個過程(cheng)稱為吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)劑(ji)的再生(sheng)。因此(ci)在實際吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)工(gong)程(cheng)中(zhong)(zhong),正是利用(yong)吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)一(yi)再生(sheng)一(yi)再吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)的循(xun)環(huan)過程(cheng),達(da)到除去廢氣中(zhong)(zhong)污染(ran)物(wu)質(zhi)并回收廢氣中(zhong)(zhong)有(you)用(yong)組(zu)分。