在用多孔性(xing)固(gu)(gu)體物(wu)質(zhi)(zhi)處(chu)(chu)理流(liu)體混合物(wu)時(shi),流(liu)體中的某一組(zu)分或某些組(zu)分可被吸(xi)(xi)表面并濃集其上,此現象稱(cheng)為(wei)(wei)(wei)吸(xi)(xi)附(fu)(fu)。吸(xi)(xi)附(fu)(fu)處(chu)(chu)理廢氣時(shi),吸(xi)(xi)附(fu)(fu)的對象是氣態(tai)污染物(wu),氣固(gu)(gu)吸(xi)(xi)附(fu)(fu)。被吸(xi)(xi)附(fu)(fu)的氣體組(zu)分稱(cheng)為(wei)(wei)(wei)吸(xi)(xi)附(fu)(fu)質(zhi)(zhi),多孔固(gu)(gu)體物(wu)質(zhi)(zhi)稱(cheng)為(wei)(wei)(wei)吸(xi)(xi)附(fu)(fu)劑(ji)。
固體表(biao)面(mian)吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)(fu)(fu)(fu)(fu)了(le)吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)(fu)(fu)(fu)(fu)質(zhi)后,一部被吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)(fu)(fu)(fu)(fu)的吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)(fu)(fu)(fu)(fu)質(zhi)可從吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)(fu)(fu)(fu)(fu)劑(ji)(ji)表(biao)面(mian)脫離,此(ci)現附(fu)(fu)(fu)(fu)(fu)(fu)(fu)(fu)。而當吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)(fu)(fu)(fu)(fu)進行一段時間后,由于(yu)表(biao)面(mian)吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)(fu)(fu)(fu)(fu)質(zhi)的濃集,使其吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)(fu)(fu)(fu)(fu)能力明顯下降而吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)(fu)(fu)(fu)(fu)凈化(hua)的要(yao)求(qiu),此(ci)時需要(yao)采用(yong)一定的措施(shi)使吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)(fu)(fu)(fu)(fu)劑(ji)(ji)上已吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)(fu)(fu)(fu)(fu)的吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)(fu)(fu)(fu)(fu)質(zhi)脫附(fu)(fu)(fu)(fu)(fu)(fu)(fu)(fu),以(yi)協的吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)(fu)(fu)(fu)(fu)能力,這個過(guo)程稱為吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)(fu)(fu)(fu)(fu)劑(ji)(ji)的再(zai)生(sheng)。因此(ci)在(zai)實際吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)(fu)(fu)(fu)(fu)工程中,正是利(li)用(yong)吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)(fu)(fu)(fu)(fu)一再(zai)生(sheng)一再(zai)吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)(fu)(fu)(fu)(fu)的循環過(guo)程,達到(dao)除去廢氣中污染物質(zhi)并回收(shou)廢氣中有(you)用(yong)組分。