一、電滲析裝置是直流還是交流電

電滲析裝置是(shi)利用離子(zi)交(jiao)(jiao)換膜和電場，使水(shui)中電解質(zhi)的離子(zi)產生選擇性遷移，從而(er)達到使水(shui)淡化的裝置，那(nei)么它(ta)用的是(shi)直流電還是(shi)交(jiao)(jiao)流電呢？

據(ju)了(le)解，電(dian)(dian)(dian)(dian)滲(shen)析(xi)設備使(shi)用的(de)(de)是(shi)直流電(dian)(dian)(dian)(dian)，因為只有直流電(dian)(dian)(dian)(dian)源才能讓(rang)你想滲(shen)析(xi)的(de)(de)離(li)子(zi)定向(xiang)移(yi)動，交流電(dian)(dian)(dian)(dian)的(de)(de)話，電(dian)(dian)(dian)(dian)場方向(xiang)不停的(de)(de)換(huan)（比如50Hz），帶電(dian)(dian)(dian)(dian)的(de)(de)離(li)子(zi)就(jiu)會在原(yuan)位(wei)附近來(lai)回(hui)振蕩，不會定向(xiang)遷移(yi)，無法達到想要的(de)(de)滲(shen)析(xi)效果。

二、電滲析設備要多大的電流

電滲析設備工作時，要(yao)(yao)根(gen)據需要(yao)(yao)選擇(ze)(ze)合適的(de)(de)(de)工作電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)，一般來說，原水含鹽量(liang)高，可以選擇(ze)(ze)大電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)密(mi)度(du)。在(zai)一定(ding)的(de)(de)(de)除(chu)鹽量(liang)和(he)(he)(he)水質條(tiao)件下，使用(yong)大電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)密(mi)度(du)可以減少(shao)電(dian)(dian)(dian)(dian)(dian)滲析設備損耗，降低成(cheng)本(ben)，但(dan)增加(jia)日常(chang)運(yun)行電(dian)(dian)(dian)(dian)(dian)費(fei)(fei)。在(zai)使用(yong)小電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)密(mi)度(du)的(de)(de)(de)情況下，降低了日常(chang)運(yun)行電(dian)(dian)(dian)(dian)(dian)費(fei)(fei)，但(dan)需要(yao)(yao)選擇(ze)(ze)較大的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)滲析，增加(jia)成(cheng)本(ben)。電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)密(mi)度(du)較小化成(cheng)本(ben)和(he)(he)(he)每日運(yun)行電(dian)(dian)(dian)(dian)(dian)費(fei)(fei)的(de)(de)(de)總和(he)(he)(he)，稱為經濟電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)密(mi)度(du)，頂點電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)密(mi)度(du)和(he)(he)(he)經濟電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)密(mi)度(du)不(bu)一定(ding)相等。如(ru)果它們(men)不(bu)同，則應(ying)選擇(ze)(ze)較低的(de)(de)(de)值。

總的(de)來(lai)說，工(gong)(gong)作電(dian)(dian)流(liu)(liu)(liu)高，有(you)利于提高設(she)備效率；工(gong)(gong)作電(dian)(dian)流(liu)(liu)(liu)低，有(you)利于防止(zhi)極(ji)化(hua)。一般控制工(gong)(gong)作電(dian)(dian)流(liu)(liu)(liu)為(wei)極(ji)限電(dian)(dian)流(liu)(liu)(liu)的(de)90%。此外，如果選(xuan)定的(de)工(gong)(gong)作電(dian)(dian)流(liu)(liu)(liu)發生(sheng)變(bian)化(hua)，要查(cha)清原因，不可貿然采用提高電(dian)(dian)壓的(de)辦(ban)法來(lai)處理(li)。