■熔鹽電加熱器:
熔(rong)(rong)鹽(yan)(yan)(yan)(yan)電(dian)加(jia)(jia)熱(re)(re)(re)器(qi)是一(yi)(yi)(yi)種(zhong)電(dian)加(jia)(jia)熱(re)(re)(re)設備(bei),用于對(dui)流動(dong)的液(ye)態、氣態介質(zhi)的升溫、保溫、加(jia)(jia)熱(re)(re)(re)。熔(rong)(rong)鹽(yan)(yan)(yan)(yan)電(dian)加(jia)(jia)熱(re)(re)(re)器(qi)利用特殊管狀電(dian)熱(re)(re)(re)元件結合(he)法蘭集(ji)束的形式與(yu)壓力容器(qi)組(zu)成(cheng)一(yi)(yi)(yi)個(ge)供熱(re)(re)(re)整體(ti),利用加(jia)(jia)熱(re)(re)(re)二元熔(rong)(rong)鹽(yan)(yan)(yan)(yan)或三元熔(rong)(rong)鹽(yan)(yan)(yan)(yan)作為加(jia)(jia)熱(re)(re)(re)介質(zhi)。一(yi)(yi)(yi)般(ban)這種(zhong)加(jia)(jia)熱(re)(re)(re)方式與(yu)熔(rong)(rong)鹽(yan)(yan)(yan)(yan)罐(guan)組(zu)成(cheng)一(yi)(yi)(yi)個(ge)整體(ti),當常溫下的硝鹽(yan)(yan)(yan)(yan)倒入熔(rong)(rong)鹽(yan)(yan)(yan)(yan)罐(guan)中以后,利用熔(rong)(rong)鹽(yan)(yan)(yan)(yan)罐(guan)內的少量電(dian)熱(re)(re)(re)元件給其預熱(re)(re)(re),使之變為液(ye)態,然(ran)后通過熔(rong)(rong)鹽(yan)(yan)(yan)(yan)泵(beng)抽取熔(rong)(rong)鹽(yan)(yan)(yan)(yan)往加(jia)(jia)熱(re)(re)(re)器(qi)內部流,進一(yi)(yi)(yi)步給熔(rong)(rong)鹽(yan)(yan)(yan)(yan)增(zeng)溫,到達熔(rong)(rong)鹽(yan)(yan)(yan)(yan)加(jia)(jia)熱(re)(re)(re)器(qi)出口(kou)處已經基(ji)本完(wan)成(cheng)加(jia)(jia)熱(re)(re)(re)的目的,并與(yu)用戶的用熱(re)(re)(re)設備(bei)形成(cheng)一(yi)(yi)(yi)個(ge)循環的整體(ti),源源不斷的給其加(jia)(jia)熱(re)(re)(re),從而滿(man)足工藝的要求。
■熔鹽電(dian)加熱器(qi)應用范圍(wei):
熔鹽電加熱器廣(guang)泛應用于儲(chu)能、儲(chu)熱、火電調峰、化肥、三(san)聚氫胺、氧化鋁等高溫加熱生產工(gong)藝(yi)。
■熔(rong)鹽電(dian)加(jia)熱器控(kong)制系(xi)統概(gai)述:
1、有常規的電氣保護,如流量和短(duan)路保護等。
2、有一套獨(du)立(li)于溫度控(kong)制的超(chao)溫報(bao)警(jing)系統,當電(dian)加熱器內部溫度超(chao)過計定(ding)值時,它將不(bu)可自動復位地關閉電(dian)加熱器,并(bing)輸(shu)出一個觸點信號。
3、有一套獨(du)立的低(di)液位報警,當液位低(di)于要(yao)求(qiu)值時,它將自(zi)動關閉電加(jia)熱器,并(bing)輸(shu)出一個信(xin)號。
4、提(ti)供數個聯鎖接口,以便和其它設備如(ru)泵、流量(liang)(壓力)開關等裝置聯鎖,確保(bao)加(jia)熱(re)器加(jia)熱(re)時有一定流量(liang)的介質在(zai)流動,保(bao)證系統的安(an)全。
5、控(kong)制可以向DCS系統(tong)提供(gong)加熱系統(tong)處于運行、停止(zhi)、超(chao)溫(wen)報警(jing)、液位信(xin)號(hao)(低(di)液位報警(jing))、互鎖狀態、溫(wen)度信(xin)號(hao)(4~20mA)等信(xin)號(hao),除(chu)溫(wen)度信(xin)號(hao)外,它(ta)們(men)均為無源觸(chu)點(dian);可以接受DCS發出的啟動、停止(zhi)操作命令(ling),要求的觸(chu)點(dian)容量亦(yi)為220V 1A。
6、具有PID溫(wen)度調(diao)節功(gong)能,加熱(re)(re)系(xi)統(tong)可以通過(guo)程序設置介質的(de)升溫(wen)曲線,并能在流(liu)量不足或停止加熱(re)(re)后(hou),根據工藝要求(qiu)控(kong)(kong)制泵,本控(kong)(kong)制系(xi)統(tong)采用多級(ji)控(kong)(kong)制技(ji)術,即(ji)把加熱(re)(re)器(qi)分成幾組(zu),其中(zhong)一組(zu)也就(jiu)是很大的(de)一組(zu)可以無級(ji)調(diao)壓,根據出(chu)口溫(wen)度,經運算(suan)后(hou),控(kong)(kong)制系(xi)統(tong)自動(dong)控(kong)(kong)制加熱(re)(re)器(qi)每(mei)組(zu)的(de)通斷(duan)和另一組(zu)加熱(re)(re)器(qi)的(de)輸(shu)出(chu)功(gong)率,達到無級(ji)調(diao)功(gong)。這(zhe)樣,能很有效(xiao)地達到提(ti)高控(kong)(kong)溫(wen)精度的(de)目的(de)。