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在(zai)以直接蒸(zheng)(zheng)(zheng)(zheng)汽(qi)加(jia)熱的蒸(zheng)(zheng)(zheng)(zheng)發(fa)器(qi)(qi)(qi)內，由被加(jia)熱液體沸騰而產生的二次(ci)(ci)蒸(zheng)(zheng)(zheng)(zheng)汽(qi)進(jin)入(ru)第(di)二個蒸(zheng)(zheng)(zheng)(zheng)發(fa)器(qi)(qi)(qi)作(zuo)(zuo)為熱源，即為二效蒸(zheng)(zheng)(zheng)(zheng)發(fa)。這樣依次(ci)(ci)利用前一(yi)效的二次(ci)(ci)蒸(zheng)(zheng)(zheng)(zheng)汽(qi)作(zuo)(zuo)為下(xia)一(yi)效的蒸(zheng)(zheng)(zheng)(zheng)發(fa)器(qi)(qi)(qi)的熱源。根(gen)據能量守恒定(ding)理(li)，處理(li)器(qi)(qi)(qi)每蒸(zheng)(zheng)(zheng)(zheng)發(fa)1t水(shui)(shui)所消耗的蒸(zheng)(zheng)(zheng)(zheng)汽(qi)量為：單效1.1，雙效0.57，三(san)效0.4，四效0.3，五效0.27。物(wu)料(liao)經分(fen)配(pei)器(qi)(qi)(qi)被均勻地分(fen)配(pei)到各蒸(zheng)(zheng)(zheng)(zheng)發(fa)器(qi)(qi)(qi)管(guan)內，物(wu)料(liao)在(zai)重力和自(zi)蒸(zheng)(zheng)(zheng)(zheng)發(fa)形(xing)式的二次(ci)(ci)蒸(zheng)(zheng)(zheng)(zheng)發(fa)的作(zuo)(zuo)用下(xia)形(xing)成(cheng)(cheng)膜狀(zhuang)，同時物(wu)料(liao)薄膜與(yu)列管(guan)外壁蒸(zheng)(zheng)(zheng)(zheng)汽(qi)發(fa)生熱量交換，使物(wu)料(liao)中的水(shui)(shui)份受(shou)熱蒸(zheng)(zheng)(zheng)(zheng)發(fa)，穩(wen)定(ding)的溫差(cha)和傳熱，形(xing)成(cheng)(cheng)穩(wen)定(ding)蒸(zheng)(zheng)(zheng)(zheng)發(fa)，被蒸(zheng)(zheng)(zheng)(zheng)發(fa)的水(shui)(shui)份所形(xing)成(cheng)(cheng)的二次(ci)(ci)蒸(zheng)(zheng)(zheng)(zheng)汽(qi)被多次(ci)(ci)利用，根(gen)據物(wu)料(liao)特點較大(da)限(xian)度(du)的多次(ci)(ci)利用來降低蒸(zheng)(zheng)(zheng)(zheng)汽(qi)消耗，形(xing)成(cheng)(cheng)多效蒸(zheng)(zheng)(zheng)(zheng)發(fa)和高效節(jie)能的目的。