■熔鹽電加熱器:
熔(rong)(rong)(rong)鹽(yan)(yan)(yan)(yan)(yan)電(dian)(dian)(dian)(dian)加(jia)(jia)熱器(qi)是一(yi)種電(dian)(dian)(dian)(dian)加(jia)(jia)熱設備(bei),用于(yu)對流動的(de)液態、氣態介質的(de)升溫(wen)(wen)、保溫(wen)(wen)、加(jia)(jia)熱。熔(rong)(rong)(rong)鹽(yan)(yan)(yan)(yan)(yan)電(dian)(dian)(dian)(dian)加(jia)(jia)熱器(qi)利用特殊(shu)管狀電(dian)(dian)(dian)(dian)熱元(yuan)(yuan)件結合法(fa)蘭集束(shu)的(de)形式與(yu)壓(ya)力容器(qi)組(zu)成(cheng)(cheng)一(yi)個(ge)供熱整(zheng)體,利用加(jia)(jia)熱二元(yuan)(yuan)熔(rong)(rong)(rong)鹽(yan)(yan)(yan)(yan)(yan)或三(san)元(yuan)(yuan)熔(rong)(rong)(rong)鹽(yan)(yan)(yan)(yan)(yan)作(zuo)為加(jia)(jia)熱介質。一(yi)般這(zhe)種加(jia)(jia)熱方(fang)式與(yu)熔(rong)(rong)(rong)鹽(yan)(yan)(yan)(yan)(yan)罐組(zu)成(cheng)(cheng)一(yi)個(ge)整(zheng)體,當常溫(wen)(wen)下(xia)的(de)硝鹽(yan)(yan)(yan)(yan)(yan)倒入熔(rong)(rong)(rong)鹽(yan)(yan)(yan)(yan)(yan)罐中(zhong)以后,利用熔(rong)(rong)(rong)鹽(yan)(yan)(yan)(yan)(yan)罐內的(de)少量電(dian)(dian)(dian)(dian)熱元(yuan)(yuan)件給其預熱,使之(zhi)變為液態,然后通過熔(rong)(rong)(rong)鹽(yan)(yan)(yan)(yan)(yan)泵抽(chou)取熔(rong)(rong)(rong)鹽(yan)(yan)(yan)(yan)(yan)往加(jia)(jia)熱器(qi)內部流,進一(yi)步給熔(rong)(rong)(rong)鹽(yan)(yan)(yan)(yan)(yan)增溫(wen)(wen),到(dao)達熔(rong)(rong)(rong)鹽(yan)(yan)(yan)(yan)(yan)加(jia)(jia)熱器(qi)出口處(chu)已(yi)經基本完成(cheng)(cheng)加(jia)(jia)熱的(de)目的(de),并(bing)與(yu)用戶的(de)用熱設備(bei)形成(cheng)(cheng)一(yi)個(ge)循環的(de)整(zheng)體,源源不(bu)斷(duan)的(de)給其加(jia)(jia)熱,從而滿足工藝(yi)的(de)要(yao)求。
■熔(rong)鹽電加熱器應用范(fan)圍:
熔(rong)鹽電加熱器廣泛應(ying)用于儲能、儲熱、火(huo)電調(diao)峰、化(hua)肥、三聚氫胺(an)、氧化(hua)鋁等(deng)高溫加熱生產工藝。
■熔(rong)鹽電加熱器控(kong)制系統概述(shu):
1、有常規的(de)電(dian)氣(qi)保(bao)護(hu),如流量和(he)短路保(bao)護(hu)等。
2、有一套獨立于溫(wen)度控制的超溫(wen)報警系統,當電加熱器(qi)內部(bu)溫(wen)度超過計定值(zhi)時,它將不可(ke)自動復位地關閉電加熱器(qi),并輸出一個觸點信號。
3、有一套獨立(li)的低(di)液位(wei)報警,當液位(wei)低(di)于要求值時,它將自動關閉(bi)電加熱器,并輸出一個信(xin)號。
4、提供數個聯鎖接口,以便和其它(ta)設備如泵、流(liu)量(壓(ya)力)開(kai)關(guan)等裝(zhuang)置聯鎖,確(que)保加(jia)熱(re)器加(jia)熱(re)時有一定流(liu)量的(de)介(jie)質(zhi)在流(liu)動,保證系統的(de)安全。
5、控制可以向DCS系統提供加(jia)熱系統處于運(yun)行、停(ting)止(zhi)(zhi)、超溫(wen)報警、液(ye)(ye)位信(xin)(xin)號(低(di)液(ye)(ye)位報警)、互鎖狀(zhuang)態(tai)、溫(wen)度信(xin)(xin)號(4~20mA)等(deng)信(xin)(xin)號,除(chu)溫(wen)度信(xin)(xin)號外,它們均為(wei)無源觸點;可以接(jie)受(shou)DCS發出的啟動、停(ting)止(zhi)(zhi)操作(zuo)命令,要求的觸點容量亦為(wei)220V 1A。
6、具有PID溫度調(diao)節功(gong)能(neng)(neng),加熱(re)系統可(ke)以通過程序設(she)置介(jie)質的(de)升溫曲線,并能(neng)(neng)在流量不足(zu)或停止加熱(re)后,根(gen)據工(gong)藝要求控(kong)制泵,本(ben)控(kong)制系統采(cai)用多(duo)級(ji)控(kong)制技術(shu),即把(ba)加熱(re)器分成幾組(zu),其中一組(zu)也就是(shi)很大的(de)一組(zu)可(ke)以無級(ji)調(diao)壓,根(gen)據出(chu)口溫度,經運算(suan)后,控(kong)制系統自動控(kong)制加熱(re)器每(mei)組(zu)的(de)通斷和另一組(zu)加熱(re)器的(de)輸(shu)出(chu)功(gong)率,達(da)(da)到無級(ji)調(diao)功(gong)。這樣,能(neng)(neng)很有效地達(da)(da)到提高(gao)控(kong)溫精度的(de)目的(de)。