■熔鹽電加熱器:
熔(rong)鹽(yan)(yan)(yan)(yan)(yan)電(dian)加(jia)熱器是一(yi)種(zhong)電(dian)加(jia)熱設備,用(yong)(yong)(yong)(yong)于對(dui)流動的(de)(de)(de)液(ye)態(tai)、氣態(tai)介質(zhi)的(de)(de)(de)升溫(wen)、保(bao)溫(wen)、加(jia)熱。熔(rong)鹽(yan)(yan)(yan)(yan)(yan)電(dian)加(jia)熱器利用(yong)(yong)(yong)(yong)特殊管狀(zhuang)電(dian)熱元(yuan)件結合法蘭(lan)集束(shu)的(de)(de)(de)形式與(yu)(yu)壓力容(rong)器組成(cheng)一(yi)個供熱整(zheng)(zheng)體,利用(yong)(yong)(yong)(yong)加(jia)熱二元(yuan)熔(rong)鹽(yan)(yan)(yan)(yan)(yan)或(huo)三元(yuan)熔(rong)鹽(yan)(yan)(yan)(yan)(yan)作為(wei)(wei)加(jia)熱介質(zhi)。一(yi)般這種(zhong)加(jia)熱方式與(yu)(yu)熔(rong)鹽(yan)(yan)(yan)(yan)(yan)罐組成(cheng)一(yi)個整(zheng)(zheng)體,當常溫(wen)下的(de)(de)(de)硝鹽(yan)(yan)(yan)(yan)(yan)倒入(ru)熔(rong)鹽(yan)(yan)(yan)(yan)(yan)罐中(zhong)以后,利用(yong)(yong)(yong)(yong)熔(rong)鹽(yan)(yan)(yan)(yan)(yan)罐內的(de)(de)(de)少量電(dian)熱元(yuan)件給(gei)其(qi)預(yu)熱,使之變為(wei)(wei)液(ye)態(tai),然(ran)后通過熔(rong)鹽(yan)(yan)(yan)(yan)(yan)泵(beng)抽取熔(rong)鹽(yan)(yan)(yan)(yan)(yan)往(wang)加(jia)熱器內部流,進一(yi)步給(gei)熔(rong)鹽(yan)(yan)(yan)(yan)(yan)增溫(wen),到達熔(rong)鹽(yan)(yan)(yan)(yan)(yan)加(jia)熱器出(chu)口處已經基本完成(cheng)加(jia)熱的(de)(de)(de)目的(de)(de)(de),并與(yu)(yu)用(yong)(yong)(yong)(yong)戶的(de)(de)(de)用(yong)(yong)(yong)(yong)熱設備形成(cheng)一(yi)個循環的(de)(de)(de)整(zheng)(zheng)體,源(yuan)源(yuan)不斷的(de)(de)(de)給(gei)其(qi)加(jia)熱,從而滿足工藝的(de)(de)(de)要求。
■熔(rong)鹽電加(jia)熱器應用范(fan)圍:
熔鹽電(dian)加熱器廣(guang)泛應(ying)用于儲(chu)能(neng)、儲(chu)熱、火電(dian)調(diao)峰(feng)、化(hua)肥、三(san)聚氫胺、氧化(hua)鋁等高溫加熱生(sheng)產工(gong)藝。
■熔鹽電加熱器控制系(xi)統概述:
1、有常規的電氣保(bao)(bao)護,如(ru)流量和(he)短路保(bao)(bao)護等。
2、有一套獨(du)立于溫(wen)度控制(zhi)的超溫(wen)報警系統,當電(dian)加熱(re)器內(nei)部溫(wen)度超過計定值(zhi)時,它(ta)將不可自動復位地(di)關閉電(dian)加熱(re)器,并輸出一個觸點信號。
3、有一套獨立的低液位報警,當液位低于要求值時,它將自動關閉電加熱(re)器,并(bing)輸出一個信號。
4、提供數個聯鎖接(jie)口(kou),以便和其(qi)它設(she)備如泵(beng)、流(liu)(liu)量(liang)(壓力)開關等(deng)裝置聯鎖,確保加熱(re)器加熱(re)時有一定(ding)流(liu)(liu)量(liang)的介質在流(liu)(liu)動,保證系統的安全。
5、控(kong)制可以(yi)向DCS系(xi)統提供加(jia)熱系(xi)統處于運行、停止、超溫報(bao)警(jing)、液位(wei)信號(低液位(wei)報(bao)警(jing))、互(hu)鎖狀態、溫度信號(4~20mA)等信號,除溫度信號外,它(ta)們均為無源觸(chu)點;可以(yi)接受DCS發出的(de)啟(qi)動、停止操作命令,要(yao)求的(de)觸(chu)點容量亦為220V 1A。
6、具有(you)PID溫(wen)度調(diao)節功(gong)能,加熱(re)(re)(re)系統(tong)可以通過程序設置介(jie)質的(de)升溫(wen)曲線(xian),并能在(zai)流量不(bu)足或停止加熱(re)(re)(re)后,根(gen)據工藝要(yao)求控(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)泵,本控(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)系統(tong)采用多(duo)級(ji)控(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)技術,即把(ba)加熱(re)(re)(re)器(qi)分成幾(ji)組(zu),其中一組(zu)也就是很大的(de)一組(zu)可以無級(ji)調(diao)壓,根(gen)據出口溫(wen)度,經運(yun)算后,控(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)系統(tong)自動控(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)加熱(re)(re)(re)器(qi)每組(zu)的(de)通斷和(he)另(ling)一組(zu)加熱(re)(re)(re)器(qi)的(de)輸出功(gong)率(lv),達(da)到無級(ji)調(diao)功(gong)。這樣,能很有(you)效地達(da)到提高控(kong)(kong)(kong)(kong)溫(wen)精度的(de)目的(de)。