■熔鹽電加熱器:
熔鹽(yan)(yan)(yan)(yan)電(dian)(dian)加(jia)熱(re)(re)(re)(re)(re)(re)器(qi)(qi)(qi)是一(yi)(yi)種(zhong)電(dian)(dian)加(jia)熱(re)(re)(re)(re)(re)(re)設備,用(yong)于對流動的液(ye)態(tai)、氣態(tai)介質(zhi)的升溫(wen)(wen)、保溫(wen)(wen)、加(jia)熱(re)(re)(re)(re)(re)(re)。熔鹽(yan)(yan)(yan)(yan)電(dian)(dian)加(jia)熱(re)(re)(re)(re)(re)(re)器(qi)(qi)(qi)利(li)用(yong)特殊管(guan)狀電(dian)(dian)熱(re)(re)(re)(re)(re)(re)元件(jian)結合法(fa)蘭(lan)集束的形式與(yu)壓(ya)力(li)容器(qi)(qi)(qi)組成一(yi)(yi)個(ge)(ge)供熱(re)(re)(re)(re)(re)(re)整(zheng)體,利(li)用(yong)加(jia)熱(re)(re)(re)(re)(re)(re)二元熔鹽(yan)(yan)(yan)(yan)或三(san)元熔鹽(yan)(yan)(yan)(yan)作為(wei)(wei)加(jia)熱(re)(re)(re)(re)(re)(re)介質(zhi)。一(yi)(yi)般這種(zhong)加(jia)熱(re)(re)(re)(re)(re)(re)方式與(yu)熔鹽(yan)(yan)(yan)(yan)罐組成一(yi)(yi)個(ge)(ge)整(zheng)體,當常溫(wen)(wen)下的硝鹽(yan)(yan)(yan)(yan)倒入熔鹽(yan)(yan)(yan)(yan)罐中(zhong)以后(hou),利(li)用(yong)熔鹽(yan)(yan)(yan)(yan)罐內的少量電(dian)(dian)熱(re)(re)(re)(re)(re)(re)元件(jian)給其預(yu)熱(re)(re)(re)(re)(re)(re),使(shi)之(zhi)變為(wei)(wei)液(ye)態(tai),然(ran)后(hou)通過(guo)熔鹽(yan)(yan)(yan)(yan)泵(beng)抽(chou)取熔鹽(yan)(yan)(yan)(yan)往加(jia)熱(re)(re)(re)(re)(re)(re)器(qi)(qi)(qi)內部流,進(jin)一(yi)(yi)步給熔鹽(yan)(yan)(yan)(yan)增(zeng)溫(wen)(wen),到達熔鹽(yan)(yan)(yan)(yan)加(jia)熱(re)(re)(re)(re)(re)(re)器(qi)(qi)(qi)出口處已經(jing)基本完成加(jia)熱(re)(re)(re)(re)(re)(re)的目的,并與(yu)用(yong)戶的用(yong)熱(re)(re)(re)(re)(re)(re)設備形成一(yi)(yi)個(ge)(ge)循環的整(zheng)體,源源不斷的給其加(jia)熱(re)(re)(re)(re)(re)(re),從而(er)滿足工藝的要求。
■熔鹽電加熱器應(ying)用(yong)范圍:
熔(rong)鹽電(dian)加熱(re)器廣泛應用于儲能、儲熱(re)、火電(dian)調峰、化肥(fei)、三聚氫胺(an)、氧化鋁等高溫加熱(re)生產工藝。
■熔(rong)鹽(yan)電加熱器(qi)控(kong)制系(xi)統概述:
1、有常規的電(dian)氣保護(hu),如流量和短(duan)路(lu)保護(hu)等。
2、有(you)一套獨立于溫度控制(zhi)的超溫報警系統,當(dang)電加(jia)熱(re)器(qi)內(nei)部溫度超過計定值時,它將不(bu)可(ke)自動(dong)復位地(di)關閉電加(jia)熱(re)器(qi),并輸出一個觸點信號。
3、有一套獨(du)立(li)的(de)低液位(wei)報警,當液位(wei)低于要(yao)求值時,它將自動關閉電加熱器,并(bing)輸出一個信號。
4、提供數個(ge)聯鎖接(jie)口,以便(bian)和(he)其它設備如(ru)泵、流(liu)量(壓力)開關等裝(zhuang)置(zhi)聯鎖,確保加(jia)熱器加(jia)熱時(shi)有一(yi)定流(liu)量的介質在流(liu)動,保證(zheng)系(xi)統(tong)的安全。
5、控制可以向DCS系統提(ti)供(gong)加熱系統處于運行(xing)、停止、超溫(wen)報警、液位信號(hao)(低液位報警)、互鎖狀(zhuang)態、溫(wen)度信號(hao)(4~20mA)等信號(hao),除溫(wen)度信號(hao)外,它(ta)們均為無源(yuan)觸(chu)點(dian);可以接受(shou)DCS發出的(de)啟(qi)動、停止操作命令,要求的(de)觸(chu)點(dian)容(rong)量亦為220V 1A。
6、具有(you)PID溫(wen)度(du)調(diao)(diao)(diao)節功能,加(jia)(jia)熱系(xi)統(tong)可以通(tong)過(guo)程序設置(zhi)介質的(de)升溫(wen)曲線,并能在流量不足(zu)或停(ting)止(zhi)加(jia)(jia)熱后,根據(ju)工藝(yi)要求控(kong)制(zhi)泵(beng),本控(kong)制(zhi)系(xi)統(tong)采用(yong)多級(ji)控(kong)制(zhi)技術,即把加(jia)(jia)熱器(qi)(qi)分成幾組(zu),其(qi)中一組(zu)也(ye)就是很(hen)大的(de)一組(zu)可以無(wu)級(ji)調(diao)(diao)(diao)壓,根據(ju)出(chu)口溫(wen)度(du),經(jing)運算后,控(kong)制(zhi)系(xi)統(tong)自動控(kong)制(zhi)加(jia)(jia)熱器(qi)(qi)每組(zu)的(de)通(tong)斷和另(ling)一組(zu)加(jia)(jia)熱器(qi)(qi)的(de)輸出(chu)功率,達到無(wu)級(ji)調(diao)(diao)(diao)功。這(zhe)樣,能很(hen)有(you)效地達到提高(gao)控(kong)溫(wen)精度(du)的(de)目(mu)的(de)。