■熔鹽電加熱器:
熔(rong)鹽(yan)(yan)(yan)(yan)電(dian)(dian)加(jia)熱(re)(re)(re)(re)器是一種電(dian)(dian)加(jia)熱(re)(re)(re)(re)設備(bei),用(yong)(yong)于對流(liu)動(dong)的(de)(de)(de)(de)(de)(de)液態、氣態介質的(de)(de)(de)(de)(de)(de)升溫(wen)(wen)、保溫(wen)(wen)、加(jia)熱(re)(re)(re)(re)。熔(rong)鹽(yan)(yan)(yan)(yan)電(dian)(dian)加(jia)熱(re)(re)(re)(re)器利用(yong)(yong)特殊管狀(zhuang)電(dian)(dian)熱(re)(re)(re)(re)元(yuan)件結合法蘭集束的(de)(de)(de)(de)(de)(de)形(xing)式與(yu)壓力(li)容器組成一個供熱(re)(re)(re)(re)整(zheng)體(ti),利用(yong)(yong)加(jia)熱(re)(re)(re)(re)二元(yuan)熔(rong)鹽(yan)(yan)(yan)(yan)或三元(yuan)熔(rong)鹽(yan)(yan)(yan)(yan)作為(wei)加(jia)熱(re)(re)(re)(re)介質。一般這種加(jia)熱(re)(re)(re)(re)方式與(yu)熔(rong)鹽(yan)(yan)(yan)(yan)罐組成一個整(zheng)體(ti),當常(chang)溫(wen)(wen)下(xia)的(de)(de)(de)(de)(de)(de)硝鹽(yan)(yan)(yan)(yan)倒(dao)入(ru)熔(rong)鹽(yan)(yan)(yan)(yan)罐中以后,利用(yong)(yong)熔(rong)鹽(yan)(yan)(yan)(yan)罐內(nei)的(de)(de)(de)(de)(de)(de)少量電(dian)(dian)熱(re)(re)(re)(re)元(yuan)件給(gei)其預熱(re)(re)(re)(re),使之變(bian)為(wei)液態,然后通(tong)過熔(rong)鹽(yan)(yan)(yan)(yan)泵抽取熔(rong)鹽(yan)(yan)(yan)(yan)往(wang)加(jia)熱(re)(re)(re)(re)器內(nei)部流(liu),進一步給(gei)熔(rong)鹽(yan)(yan)(yan)(yan)增(zeng)溫(wen)(wen),到達熔(rong)鹽(yan)(yan)(yan)(yan)加(jia)熱(re)(re)(re)(re)器出(chu)口(kou)處已經基本(ben)完(wan)成加(jia)熱(re)(re)(re)(re)的(de)(de)(de)(de)(de)(de)目(mu)的(de)(de)(de)(de)(de)(de),并(bing)與(yu)用(yong)(yong)戶(hu)的(de)(de)(de)(de)(de)(de)用(yong)(yong)熱(re)(re)(re)(re)設備(bei)形(xing)成一個循環的(de)(de)(de)(de)(de)(de)整(zheng)體(ti),源源不斷(duan)的(de)(de)(de)(de)(de)(de)給(gei)其加(jia)熱(re)(re)(re)(re),從而滿足工藝的(de)(de)(de)(de)(de)(de)要求(qiu)。
■熔鹽(yan)電(dian)加熱器應(ying)用范圍:
熔鹽電加熱(re)器廣泛應(ying)用(yong)于(yu)儲能、儲熱(re)、火電調峰、化肥、三聚氫胺(an)、氧化鋁等高(gao)溫(wen)加熱(re)生(sheng)產工藝。
■熔鹽電加熱器控制(zhi)系統概述:
1、有常規的電氣(qi)保(bao)(bao)護,如流量和短路保(bao)(bao)護等。
2、有一套獨立于溫(wen)度控制(zhi)的超(chao)溫(wen)報警系統,當(dang)電(dian)(dian)加熱器內部溫(wen)度超(chao)過計定值(zhi)時,它將不可(ke)自動復位(wei)地關閉(bi)電(dian)(dian)加熱器,并輸出一個觸(chu)點信(xin)號(hao)。
3、有一套獨(du)立的低液位(wei)報警,當液位(wei)低于要求值(zhi)時,它將自動關閉電(dian)加熱器,并輸出一個信(xin)號。
4、提供數個聯(lian)鎖(suo)接口,以便和(he)其它設備(bei)如泵、流量(壓力)開關等(deng)裝(zhuang)置聯(lian)鎖(suo),確保加熱器加熱時(shi)有一定流量的介質在(zai)流動(dong),保證系統的安全。
5、控制可(ke)以(yi)(yi)向DCS系統(tong)(tong)提供加熱系統(tong)(tong)處于運行、停止(zhi)、超溫(wen)(wen)(wen)報(bao)警(jing)、液(ye)位(wei)信號(hao)(低液(ye)位(wei)報(bao)警(jing))、互(hu)鎖狀態、溫(wen)(wen)(wen)度信號(hao)(4~20mA)等信號(hao),除溫(wen)(wen)(wen)度信號(hao)外,它們均(jun)為無(wu)源觸(chu)點;可(ke)以(yi)(yi)接受DCS發(fa)出的(de)啟動(dong)、停止(zhi)操作命令,要(yao)求的(de)觸(chu)點容量亦為220V 1A。
6、具有(you)PID溫度調(diao)(diao)節功能,加熱系(xi)統可以(yi)通過程序設置介質的(de)(de)(de)升(sheng)溫曲線,并能在流量不足或停(ting)止(zhi)加熱后,根據(ju)工藝要求控(kong)(kong)制(zhi)泵,本控(kong)(kong)制(zhi)系(xi)統采用多(duo)級控(kong)(kong)制(zhi)技術,即(ji)把加熱器分(fen)成(cheng)幾組(zu),其中一組(zu)也(ye)就是(shi)很大(da)的(de)(de)(de)一組(zu)可以(yi)無級調(diao)(diao)壓,根據(ju)出口溫度,經運算后,控(kong)(kong)制(zhi)系(xi)統自動控(kong)(kong)制(zhi)加熱器每組(zu)的(de)(de)(de)通斷和(he)另一組(zu)加熱器的(de)(de)(de)輸出功率,達到無級調(diao)(diao)功。這樣(yang),能很有(you)效地(di)達到提高控(kong)(kong)溫精度的(de)(de)(de)目的(de)(de)(de)。