紅星烘干機向(xiang)組(zu)合烘(hong)(hong)干(gan)機方向(xiang)改進，近年(nian)來人(ren)們(men)把開發(fa)烘(hong)(hong)干(gan)機的(de)重(zhong)點向(xiang)開發(fa)組(zu)合烘(hong)(hong)干(gan)機的(de)方向(xiang)發(fa)展，力(li)圖(tu)把現有的(de)烘(hong)(hong)干(gan)機進行優(you)化(hua)組(zu)合，發(fa)揮每種烘(hong)(hong)干(gan)機的(de)優(you)點。

一、組合多級烘干機與單級烘機相比有如下優勢

l）組合烘干機(ji)更(geng)容易節約能(neng)源；

2）組合烘(hong)(hong)干機更容易(yi)保(bao)證產(chan)品質量，烘(hong)(hong)干過程(cheng)可以同時進行分級、粉碎等操作，對熱(re)敏性物料烘(hong)(hong)干后可進行及時冷卻；

3）操作更加靈活，可以(yi)根據(ju)份群(qun)烘于的(de)特定規律(lv)對多種烘干(gan)機進行科學組合(he)。

二、烘干機的組合大致有如下幾個方面

l）組合各(ge)種烘干(gan)方法的組合式(shi)烘干(gan)機(ji)，如噴霧較好化(hua)烘干(gan)機(ji)等；

2）結合各種傳熱過程的組合式烘干機，如薄膜(mo)較(jiao)好(hao)化床烘干機等；

3）多(duo)級同類型烘干(gan)機的組(zu)合(he)，如多(duo)級氣流烘干(gan)機等。

三、在下列情況下常采用組合烘干系統

l）采用(yong)單一烘干設備不能達(da)到水(shui)分要求時；

2）采用單一烘干機(ji)不能達到成形要求(qiu)時；

3）采(cai)用(yong)單一烘干機(ji)能耗高時；

4）采用單一(yi)烘干機(ji)不能控制汾群停留時(shi)間(jian)時(shi)；

5）烘干過程中汾(fen)群有特殊要求(qiu)時(shi)。

大多數(shu)烘(hong)(hong)(hong)(hong)(hong)(hong)干(gan)(gan)大體(ti)(ti)都(dou)可以(yi)分為恒(heng)(heng)(heng)速(su)(su)烘(hong)(hong)(hong)(hong)(hong)(hong)干(gan)(gan)和降(jiang)速(su)(su)烘(hong)(hong)(hong)(hong)(hong)(hong)于(yu)兩個階(jie)(jie)段(duan)，大量的(de)水(shui)(shui)分都(dou)在恒(heng)(heng)(heng)速(su)(su)烘(hong)(hong)(hong)(hong)(hong)(hong)干(gan)(gan)階(jie)(jie)段(duan)除(chu)掉，恒(heng)(heng)(heng)速(su)(su)烘(hong)(hong)(hong)(hong)(hong)(hong)干(gan)(gan)速(su)(su)率取(qu)(qu)決于(yu)沖群(qun)表和水(shui)(shui)的(de)氣化速(su)(su)率。用高(gao)風(feng)速(su)(su)、大風(feng)量把(ba)烘(hong)(hong)(hong)(hong)(hong)(hong)干(gan)(gan)汽(qi)化的(de)水(shui)(shui)蒸汽(qi)從沖群(qun)表帶(dai)走是(shi)提(ti)(ti)高(gao)烘(hong)(hong)(hong)(hong)(hong)(hong)干(gan)(gan)速(su)(su)率的(de)基(ji)本措施。而降(jiang)速(su)(su)烘(hong)(hong)(hong)(hong)(hong)(hong)干(gan)(gan)速(su)(su)率則取(qu)(qu)決于(yu)傳(chuan)質速(su)(su)率和熱推動力，受(shou)內部水(shui)(shui)分向外遷移速(su)(su)率的(de)限(xian)制。提(ti)(ti)高(gao)熱空氣溫(wen)度是(shi)提(ti)(ti)高(gao)降(jiang)速(su)(su)階(jie)(jie)段(duan)烘(hong)(hong)(hong)(hong)(hong)(hong)干(gan)(gan)。其一(yi)(yi)階(jie)(jie)段(duan)尾(wei)氣是(shi)低(di)溫(wen)高(gao)濕(shi)(shi)氣體(ti)(ti)，接(jie)近(jin)(jin)飽和狀態，已無濕(shi)(shi)能(neng)(neng)力，無烘(hong)(hong)(hong)(hong)(hong)(hong)干(gan)(gan)推動力，不能(neng)(neng)再起烘(hong)(hong)(hong)(hong)(hong)(hong)干(gan)(gan)作用。而降(jiang)速(su)(su)烘(hong)(hong)(hong)(hong)(hong)(hong)干(gan)(gan)階(jie)(jie)段(duan)尾(wei)氣是(shi)高(gao)溫(wen)低(di)濕(shi)(shi)氣體(ti)(ti)，如果把(ba)這部分氣體(ti)(ti)回(hui)收(shou)，用來進行(xing)其一(yi)(yi)階(jie)(jie)段(duan)烘(hong)(hong)(hong)(hong)(hong)(hong)干(gan)(gan)，仍(reng)可起到(dao)烘(hong)(hong)(hong)(hong)(hong)(hong)干(gan)(gan)作用。兩級(ji)烘(hong)(hong)(hong)(hong)(hong)(hong)干(gan)(gan)利用這一(yi)(yi)規律，把(ba)兩個烘(hong)(hong)(hong)(hong)(hong)(hong)干(gan)(gan)階(jie)(jie)段(duan)分別在兩個設備中進行(xing)。將其一(yi)(yi)階(jie)(jie)段(duan)烘(hong)(hong)(hong)(hong)(hong)(hong)干(gan)(gan)尾(wei)氣排(pai)掉，第二階(jie)(jie)段(duan)尾(wei)氣回(hui)收(shou)，使系統排(pai)出的(de)氣體(ti)(ti)接(jie)近(jin)(jin)飽和狀態，從而達到(dao)節約(yue)能(neng)(neng)源(yuan)目(mu)的(de)。