■熔鹽電加熱器:
熔(rong)鹽(yan)(yan)(yan)(yan)(yan)電加(jia)(jia)熱(re)器(qi)是(shi)一(yi)種(zhong)電加(jia)(jia)熱(re)設備(bei),用(yong)(yong)于對流(liu)動的(de)液態、氣態介質(zhi)的(de)升(sheng)溫(wen)(wen)、保(bao)溫(wen)(wen)、加(jia)(jia)熱(re)。熔(rong)鹽(yan)(yan)(yan)(yan)(yan)電加(jia)(jia)熱(re)器(qi)利用(yong)(yong)特殊(shu)管(guan)狀電熱(re)元(yuan)(yuan)(yuan)件(jian)結(jie)合法蘭集束(shu)的(de)形式(shi)與壓力容器(qi)組成一(yi)個供熱(re)整(zheng)體(ti),利用(yong)(yong)加(jia)(jia)熱(re)二元(yuan)(yuan)(yuan)熔(rong)鹽(yan)(yan)(yan)(yan)(yan)或(huo)三元(yuan)(yuan)(yuan)熔(rong)鹽(yan)(yan)(yan)(yan)(yan)作為(wei)加(jia)(jia)熱(re)介質(zhi)。一(yi)般這種(zhong)加(jia)(jia)熱(re)方(fang)式(shi)與熔(rong)鹽(yan)(yan)(yan)(yan)(yan)罐(guan)組成一(yi)個整(zheng)體(ti),當(dang)常溫(wen)(wen)下(xia)的(de)硝鹽(yan)(yan)(yan)(yan)(yan)倒入(ru)熔(rong)鹽(yan)(yan)(yan)(yan)(yan)罐(guan)中以后,利用(yong)(yong)熔(rong)鹽(yan)(yan)(yan)(yan)(yan)罐(guan)內的(de)少量電熱(re)元(yuan)(yuan)(yuan)件(jian)給(gei)其(qi)預(yu)熱(re),使之變為(wei)液態,然后通過熔(rong)鹽(yan)(yan)(yan)(yan)(yan)泵抽取熔(rong)鹽(yan)(yan)(yan)(yan)(yan)往(wang)加(jia)(jia)熱(re)器(qi)內部流(liu),進(jin)一(yi)步給(gei)熔(rong)鹽(yan)(yan)(yan)(yan)(yan)增溫(wen)(wen),到達熔(rong)鹽(yan)(yan)(yan)(yan)(yan)加(jia)(jia)熱(re)器(qi)出口處已經(jing)基本完成加(jia)(jia)熱(re)的(de)目的(de),并與用(yong)(yong)戶(hu)的(de)用(yong)(yong)熱(re)設備(bei)形成一(yi)個循環的(de)整(zheng)體(ti),源源不斷的(de)給(gei)其(qi)加(jia)(jia)熱(re),從而滿(man)足工藝(yi)的(de)要求。
■熔鹽電加熱器應用范圍:
熔鹽電加熱器廣泛應用于(yu)儲(chu)能、儲(chu)熱、火(huo)電調峰、化肥、三聚氫胺、氧化鋁等高(gao)溫加熱生產工藝。
■熔鹽電(dian)加熱器控制系統概述:
1、有常(chang)規的(de)電氣保護(hu)(hu),如流(liu)量和短路保護(hu)(hu)等。
2、有一套獨立(li)于溫度控制(zhi)的超溫報警系(xi)統,當電(dian)加熱器內部溫度超過計定值時,它將不可自動復位地關(guan)閉電(dian)加熱器,并(bing)輸出一個觸(chu)點信號。
3、有一(yi)(yi)套獨(du)立的低(di)液(ye)(ye)位(wei)報警(jing),當液(ye)(ye)位(wei)低(di)于要求值時(shi),它將(jiang)自動關閉電加熱器,并輸出一(yi)(yi)個信(xin)號。
4、提供數個聯鎖接口,以便和(he)其它設備如泵、流量(壓力)開關等裝置聯鎖,確保加熱器加熱時(shi)有一定流量的介質在(zai)流動,保證(zheng)系(xi)統(tong)的安(an)全。
5、控制可(ke)以(yi)向DCS系(xi)統(tong)提供加熱(re)系(xi)統(tong)處于運行、停(ting)止(zhi)(zhi)、超溫(wen)報警、液位(wei)(wei)信(xin)(xin)號(hao)(hao)(低液位(wei)(wei)報警)、互鎖(suo)狀態、溫(wen)度(du)(du)信(xin)(xin)號(hao)(hao)(4~20mA)等信(xin)(xin)號(hao)(hao),除溫(wen)度(du)(du)信(xin)(xin)號(hao)(hao)外,它們(men)均(jun)為無(wu)源觸點(dian);可(ke)以(yi)接受DCS發出(chu)的啟動、停(ting)止(zhi)(zhi)操作命令,要(yao)求的觸點(dian)容(rong)量亦(yi)為220V 1A。
6、具有PID溫度(du)調(diao)節功(gong)(gong)能,加(jia)熱系統(tong)可以(yi)通過程(cheng)序設(she)置介(jie)質(zhi)的升溫曲線,并能在流(liu)量(liang)不足(zu)或(huo)停止(zhi)加(jia)熱后,根據工藝要(yao)求控(kong)制(zhi)(zhi)(zhi)泵,本控(kong)制(zhi)(zhi)(zhi)系統(tong)采用多級控(kong)制(zhi)(zhi)(zhi)技術,即把加(jia)熱器(qi)分成幾組,其中(zhong)一組也就是很大的一組可以(yi)無級調(diao)壓,根據出口溫度(du),經運算后,控(kong)制(zhi)(zhi)(zhi)系統(tong)自動控(kong)制(zhi)(zhi)(zhi)加(jia)熱器(qi)每組的通斷和另一組加(jia)熱器(qi)的輸(shu)出功(gong)(gong)率,達到無級調(diao)功(gong)(gong)。這樣,能很有效地達到提高控(kong)溫精(jing)度(du)的目的。