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燃煤廠脫硫廢水零排放處理工藝
閱讀量:797 發表時間:2023-03-24

一、鹽濃縮處理工(gong)藝(yi)

鹽(yan)濃(nong)縮處(chu)理(li)工藝屬于一(yi)(yi)張深度處(chu)理(li)工藝,是從常規(gui)系統處(chu)理(li)的(de)脫硫(liu)(liu)廢水中將蒸餾(liu)水與(yu)(yu)高濃(nong)度濃(nong)縮鹽(yan)分離出來(lai)。首先(xian),預加熱(re)脫硫(liu)(liu)廢水,利(li)用(yong)除氣器(qi)除掉空氣,進行再(zai)次(ci)加熱(re),并在鹽(yan)溶液(ye)(ye)濃(nong)縮器(qi)中放入給料,為鈦(tai)合金管內壁分配(pei)漿液(ye)(ye)。漿液(ye)(ye)膜順管道(dao)向下流(liu)(liu)動,水分就會被蒸發掉,利(li)用(yong)除霧器(qi)將產生的(de)蒸汽(qi)輸送到(dao)蒸汽(qi)壓(ya)縮機,并將其飽(bao)和(he)溫度提升到(dao)與(yu)(yu)再(zai)循環鹽(yan)溶液(ye)(ye)沸點保持(chi)一(yi)(yi)致。通(tong)(tong)過壓(ya)縮后,蒸汽(qi)冷凝變為蒸餾(liu)水回用(yong)。另外,一(yi)(yi)部分回收鹽(yan)通(tong)(tong)過旋流(liu)(liu)器(qi)處(chu)理(li),而另一(yi)(yi)部分則被轉送到(dao)成品罐運往市場。

二、蒸發處(chu)理工藝

在零排放系統中,蒸發處理技術應用比較廣泛。現階段,在更多的廢(fei)水零排放項目中(zhong),機(ji)械(xie)(xie)壓(ya)(ya)縮(suo)蒸(zheng)(zheng)(zheng)(zheng)發(fa)(fa)(fa)技術成為首(shou)選(xuan)處理工(gong)(gong)藝(yi)。該技術操(cao)(cao)作(zuo)耗熱(re)(re)量(liang)(liang)大,高溫(wen)位蒸(zheng)(zheng)(zheng)(zheng)汽轉(zhuan)為低溫(wen)位,因此低溫(wen)位二(er)次蒸(zheng)(zheng)(zheng)(zheng)汽的(de)使用,一定程度上,直接影響到蒸(zheng)(zheng)(zheng)(zheng)發(fa)(fa)(fa)操(cao)(cao)作(zuo)工(gong)(gong)藝(yi)的(de)經(jing)濟性。對于(yu)蒸(zheng)(zheng)(zheng)(zheng)發(fa)(fa)(fa)能(neng)(neng)(neng)量(liang)(liang)使用效(xiao)(xiao)率(lv)(lv)的(de)提高,多(duo)效(xiao)(xiao)、機(ji)械(xie)(xie)蒸(zheng)(zheng)(zheng)(zheng)汽壓(ya)(ya)縮(suo)、熱(re)(re)力蒸(zheng)(zheng)(zheng)(zheng)汽壓(ya)(ya)縮(suo)等(deng)蒸(zheng)(zheng)(zheng)(zheng)發(fa)(fa)(fa)是主要(yao)途徑。通過利用二(er)次蒸(zheng)(zheng)(zheng)(zheng)汽形(xing)成的(de)大量(liang)(liang)潛(qian)熱(re)(re),節(jie)能(neng)(neng)(neng)效(xiao)(xiao)果明(ming)顯(xian)。隨著效(xiao)(xiao)數的(de)增多(duo),多(duo)效(xiao)(xiao)蒸(zheng)(zheng)(zheng)(zheng)發(fa)(fa)(fa)節(jie)能(neng)(neng)(neng)率(lv)(lv)明(ming)顯(xian)變大,待五效(xiao)(xiao)后再增加效(xiao)(xiao)數,節(jie)能(neng)(neng)(neng)效(xiao)(xiao)果就會減(jian)弱。蒸(zheng)(zheng)(zheng)(zheng)汽動力壓(ya)(ya)縮(suo)式熱(re)(re)泵蒸(zheng)(zheng)(zheng)(zheng)發(fa)(fa)(fa)系(xi)(xi)(xi)統(tong)(tong),其正常范圍屬于(yu)二(er)效(xiao)(xiao)與三(san)效(xiao)(xiao)蒸(zheng)(zheng)(zheng)(zheng)發(fa)(fa)(fa)間(jian),因傳熱(re)(re)溫(wen)差不同,該系(xi)(xi)(xi)統(tong)(tong)節(jie)能(neng)(neng)(neng)率(lv)(lv)也(ye)是有所差異的(de),但(dan)都比(bi)較高,與十幾效(xiao)(xiao)多(duo)效(xiao)(xiao)蒸(zheng)(zheng)(zheng)(zheng)發(fa)(fa)(fa)相似。通過對該蒸(zheng)(zheng)(zheng)(zheng)發(fa)(fa)(fa)系(xi)(xi)(xi)統(tong)(tong)進(jin)行(xing)優(you)化(hua)設計,一次能(neng)(neng)(neng)源使用效(xiao)(xiao)率(lv)(lv)依(yi)舊在八效(xiao)(xiao)蒸(zheng)(zheng)(zheng)(zheng)發(fa)(fa)(fa)之上。

三(san)、煙道噴霧處理技(ji)術

煙(yan)(yan)道(dao)噴(pen)霧(wu)處(chu)(chu)理工(gong)藝是指(zhi)用噴(pen)霧(wu)蒸發處(chu)(chu)理工(gong)藝處(chu)(chu)理煙(yan)(yan)道(dao)內廢(fei)水(shui),通(tong)(tong)過一定噴(pen)射方法(fa),將(jiang)霧(wu)化(hua)脫硫廢(fei)水(shui)噴(pen)入到電除(chu)(chu)塵(chen)器煙(yan)(yan)道(dao)內,通(tong)(tong)過高(gao)溫(wen)煙(yan)(yan)氣(qi)(qi)(qi)(qi)熱量蒸發氣(qi)(qi)(qi)(qi)化(hua)廢(fei)水(shui),促使廢(fei)水(shui)懸浮物(wu)及可溶性物(wu)質轉(zhuan)換為(wei)細小(xiao)固體(ti)顆粒(li),通(tong)(tong)過煙(yan)(yan)氣(qi)(qi)(qi)(qi)夾(jia)帶,進入電除(chu)(chu)塵(chen)器被電極捕捉(zhuo)收集后,實現污染物(wu)清除(chu)(chu)、污水(shui)零排放(fang)目標。該處(chu)(chu)理工(gong)藝優勢主要(yao)在(zai)于(yu):設備(bei)操作簡單(dan),不(bu)用摻入化(hua)學試劑;運行方便,以灰分形式將(jiang)廢(fei)水(shui)污染物(wu)排除(chu)(chu),不(bu)存在(zai)污泥處(chu)(chu)置問(wen)題,煙(yan)(yan)氣(qi)(qi)(qi)(qi)濕度比(bi)較(jiao)高(gao),煙(yan)(yan)氣(qi)(qi)(qi)(qi)灰塵(chen)顆粒(li)比(bi)下降,除(chu)(chu)塵(chen)效(xiao)率(lv)比(bi)較(jiao)高(gao)。

四、膜過濾處理工藝

脫硫廢水(shui)零排(pai)放處理工藝(yi)(yi)中,對(dui)鹽的(de)分離(li)度有很高的(de)要求(qiu),一(yi)般(ban)選(xuan)用多重反滲(shen)透過(guo)(guo)(guo)濾(lv)處理工藝(yi)(yi)。該工藝(yi)(yi)首先(xian)通過(guo)(guo)(guo)預處理,其(qi)以膜過(guo)(guo)(guo)濾(lv)為主(zhu),結(jie)合殺菌與沉(chen)淀工藝(yi)(yi),旨在去(qu)除廢水(shui)(shui)(shui)中的(de)懸浮物(wu)與微生(sheng)物(wu),水(shui)(shui)(shui)質經過(guo)(guo)(guo)處理后(hou)(hou),符合反滲(shen)透進(jin)(jin)(jin)(jin)水(shui)(shui)(shui)標準。該工藝(yi)(yi)一(yi)般(ban)采用梁(liang)段(duan)反滲(shen)透系統(tong)(tong),因二(er)段(duan)系統(tong)(tong)進(jin)(jin)(jin)(jin)水(shui)(shui)(shui)是一(yi)段(duan)系統(tong)(tong)濃(nong)(nong)水(shui)(shui)(shui),需(xu)要利(li)用專門化學藥劑(ji)予以處理,確保(bao)二(er)段(duan)系統(tong)(tong)進(jin)(jin)(jin)(jin)水(shui)(shui)(shui)水(shui)(shui)(shui)質。進(jin)(jin)(jin)(jin)入二(er)段(duan)系統(tong)(tong)前(qian),根據水(shui)(shui)(shui)質實(shi)際情況,適當的(de)加阻垢與調節劑(ji),確保(bao)系統(tong)(tong)運(yun)行(xing)更加穩定。產品水(shui)(shui)(shui)流入回水(shui)(shui)(shui)池(chi)后(hou)(hou),利(li)用系統(tong)(tong)少量濃(nong)(nong)水(shui)(shui)(shui)進(jin)(jin)(jin)(jin)行(xing)沖渣,實(shi)現廢水(shui)(shui)(shui)零排(pai)放目標。


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