順流三效(xiao)(xiao)(xiao)(xiao)蒸(zheng)(zheng)發(fa)(fa)流程中(zhong),溶液(ye)和(he)加熱(re)蒸(zheng)(zheng)汽(qi)(qi)(qi)的(de)流向相同,都是從一效(xiao)(xiao)(xiao)(xiao)開始按順序流到(dao)三效(xiao)(xiao)(xiao)(xiao)后(hou)結束。其(qi)中(zhong)加熱(re)蒸(zheng)(zheng)汽(qi)(qi)(qi)分兩(liang)種,一效(xiao)(xiao)(xiao)(xiao)是生(sheng)(sheng)蒸(zheng)(zheng)汽(qi)(qi)(qi),二(er)(er)效(xiao)(xiao)(xiao)(xiao)和(he)三效(xiao)(xiao)(xiao)(xiao)的(de)熱(re)源采用二(er)(er)次蒸(zheng)(zheng)汽(qi)(qi)(qi),即一效(xiao)(xiao)(xiao)(xiao)蒸(zheng)(zheng)發(fa)(fa)產生(sheng)(sheng)的(de)蒸(zheng)(zheng)汽(qi)(qi)(qi)是二(er)(er)效(xiao)(xiao)(xiao)(xiao)蒸(zheng)(zheng)發(fa)(fa)的(de)加熱(re)蒸(zheng)(zheng)汽(qi)(qi)(qi),二(er)(er)效(xiao)(xiao)(xiao)(xiao)蒸(zheng)(zheng)發(fa)(fa)產生(sheng)(sheng)的(de)二(er)(er)次蒸(zheng)(zheng)汽(qi)(qi)(qi)是三效(xiao)(xiao)(xiao)(xiao)蒸(zheng)(zheng)發(fa)(fa)的(de)加熱(re)蒸(zheng)(zheng)汽(qi)(qi)(qi)。
原(yuan)料(liao)液(ye)(ye)進入(ru)一效(xiao)(xiao)(xiao)(xiao)(xiao)濃(nong)(nong)縮(suo)后(hou)(hou)由(you)底(di)部排(pai)出,并(bing)依次進入(ru)二效(xiao)(xiao)(xiao)(xiao)(xiao)、三(san)效(xiao)(xiao)(xiao)(xiao)(xiao),在二效(xiao)(xiao)(xiao)(xiao)(xiao)和(he)三(san)效(xiao)(xiao)(xiao)(xiao)(xiao)被(bei)連續濃(nong)(nong)縮(suo)。完成液(ye)(ye)由(you)三(san)效(xiao)(xiao)(xiao)(xiao)(xiao)底(di)部排(pai)出。并(bing)流加料(liao)法(fa)的優點(dian)能用各效(xiao)(xiao)(xiao)(xiao)(xiao)間(jian)的壓力差輸送料(liao)液(ye)(ye);因前效(xiao)(xiao)(xiao)(xiao)(xiao)溫度(du)和(he)壓力高于(yu)后(hou)(hou)效(xiao)(xiao)(xiao)(xiao)(xiao)可以不設預熱(re)器;輔助設備少,流程緊湊,溫度(du)損失小;操(cao)作簡便,工藝穩定,設備維修量少。其缺點(dian)是(shi):后(hou)(hou)效(xiao)(xiao)(xiao)(xiao)(xiao)溫度(du)下降(jiang)后(hou)(hou),溶液(ye)(ye)黏度(du)逐效(xiao)(xiao)(xiao)(xiao)(xiao)增加,減少了(le)傳熱(re)系數,需要(yao)大的傳熱(re)面積(ji)。
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