■熔鹽電加熱器:
熔(rong)(rong)(rong)(rong)鹽(yan)(yan)電(dian)加(jia)(jia)熱(re)(re)器(qi)(qi)是(shi)一種(zhong)電(dian)加(jia)(jia)熱(re)(re)設備,用(yong)于(yu)對(dui)流動的(de)(de)(de)液態、氣態介質的(de)(de)(de)升溫、保溫、加(jia)(jia)熱(re)(re)。熔(rong)(rong)(rong)(rong)鹽(yan)(yan)電(dian)加(jia)(jia)熱(re)(re)器(qi)(qi)利(li)用(yong)特殊(shu)管狀電(dian)熱(re)(re)元件(jian)(jian)結合法蘭(lan)集束的(de)(de)(de)形(xing)式與(yu)壓(ya)力容器(qi)(qi)組成(cheng)一個(ge)供熱(re)(re)整體,利(li)用(yong)加(jia)(jia)熱(re)(re)二(er)元熔(rong)(rong)(rong)(rong)鹽(yan)(yan)或三元熔(rong)(rong)(rong)(rong)鹽(yan)(yan)作(zuo)為加(jia)(jia)熱(re)(re)介質。一般這(zhe)種(zhong)加(jia)(jia)熱(re)(re)方式與(yu)熔(rong)(rong)(rong)(rong)鹽(yan)(yan)罐(guan)組成(cheng)一個(ge)整體,當(dang)常(chang)溫下的(de)(de)(de)硝鹽(yan)(yan)倒(dao)入熔(rong)(rong)(rong)(rong)鹽(yan)(yan)罐(guan)中以后,利(li)用(yong)熔(rong)(rong)(rong)(rong)鹽(yan)(yan)罐(guan)內(nei)(nei)的(de)(de)(de)少量電(dian)熱(re)(re)元件(jian)(jian)給(gei)其(qi)預熱(re)(re),使之變為液態,然(ran)后通(tong)過熔(rong)(rong)(rong)(rong)鹽(yan)(yan)泵抽取熔(rong)(rong)(rong)(rong)鹽(yan)(yan)往加(jia)(jia)熱(re)(re)器(qi)(qi)內(nei)(nei)部流,進一步給(gei)熔(rong)(rong)(rong)(rong)鹽(yan)(yan)增溫,到(dao)達熔(rong)(rong)(rong)(rong)鹽(yan)(yan)加(jia)(jia)熱(re)(re)器(qi)(qi)出口(kou)處已經基本完成(cheng)加(jia)(jia)熱(re)(re)的(de)(de)(de)目(mu)的(de)(de)(de),并與(yu)用(yong)戶(hu)的(de)(de)(de)用(yong)熱(re)(re)設備形(xing)成(cheng)一個(ge)循環的(de)(de)(de)整體,源源不斷的(de)(de)(de)給(gei)其(qi)加(jia)(jia)熱(re)(re),從(cong)而滿足工(gong)藝的(de)(de)(de)要(yao)求。
■熔(rong)鹽電加熱器應用(yong)范(fan)圍:
熔鹽(yan)電加(jia)熱器廣泛應用(yong)于(yu)儲能、儲熱、火電調(diao)峰、化肥、三聚氫胺、氧化鋁等(deng)高溫加(jia)熱生(sheng)產工(gong)藝。
■熔鹽(yan)電加熱器控制系統概述:
1、有常規的電氣保護,如流量和(he)短路(lu)保護等。
2、有一(yi)套獨立于溫(wen)度(du)控制的超溫(wen)報警系統,當電加(jia)熱(re)器內部溫(wen)度(du)超過計定(ding)值(zhi)時,它(ta)將不可(ke)自(zi)動復位地關閉電加(jia)熱(re)器,并輸出一(yi)個觸(chu)點信號。
3、有一套獨立的低液(ye)位報(bao)警,當(dang)液(ye)位低于要求值時,它將(jiang)自動(dong)關閉電加熱(re)器(qi),并輸出一個信(xin)號。
4、提供數個(ge)聯(lian)鎖接口,以便(bian)和其它(ta)設備如泵(beng)、流量(liang)(壓力)開關等裝置(zhi)聯(lian)鎖,確保加熱(re)器加熱(re)時有一定流量(liang)的(de)介質在流動,保證系(xi)統(tong)的(de)安全。
5、控制(zhi)可(ke)以向(xiang)DCS系統(tong)提(ti)供加熱系統(tong)處于運行、停止、超溫(wen)(wen)報警(jing)、液(ye)(ye)位信號(hao)(低(di)液(ye)(ye)位報警(jing))、互鎖狀(zhuang)態(tai)、溫(wen)(wen)度(du)信號(hao)(4~20mA)等信號(hao),除溫(wen)(wen)度(du)信號(hao)外(wai),它(ta)們均為無源觸點;可(ke)以接受DCS發出的(de)啟動、停止操作命令,要求的(de)觸點容量亦為220V 1A。
6、具(ju)有PID溫度調節功能(neng)(neng),加(jia)(jia)(jia)熱(re)系統可以通過程序(xu)設置介(jie)質的(de)升溫曲線,并能(neng)(neng)在流量不足(zu)或停(ting)止加(jia)(jia)(jia)熱(re)后(hou),根據工藝要求控(kong)制(zhi)泵,本控(kong)制(zhi)系統采用多級(ji)控(kong)制(zhi)技(ji)術,即(ji)把加(jia)(jia)(jia)熱(re)器分(fen)成(cheng)幾組,其(qi)中(zhong)一(yi)組也就(jiu)是(shi)很大的(de)一(yi)組可以無級(ji)調壓,根據出(chu)口(kou)溫度,經運(yun)算后(hou),控(kong)制(zhi)系統自(zi)動控(kong)制(zhi)加(jia)(jia)(jia)熱(re)器每(mei)組的(de)通斷和另一(yi)組加(jia)(jia)(jia)熱(re)器的(de)輸出(chu)功率,達(da)到無級(ji)調功。這樣,能(neng)(neng)很有效地達(da)到提高(gao)控(kong)溫精度的(de)目的(de)。