■熔鹽電加熱器:
熔(rong)(rong)(rong)(rong)鹽(yan)(yan)電(dian)加(jia)(jia)熱(re)(re)器是一種電(dian)加(jia)(jia)熱(re)(re)設備,用(yong)于對流(liu)動(dong)的液(ye)態、氣態介質的升溫(wen)(wen)、保溫(wen)(wen)、加(jia)(jia)熱(re)(re)。熔(rong)(rong)(rong)(rong)鹽(yan)(yan)電(dian)加(jia)(jia)熱(re)(re)器利(li)(li)用(yong)特殊管狀電(dian)熱(re)(re)元(yuan)件結合法蘭集束的形(xing)式與壓力容器組(zu)成一個供熱(re)(re)整體(ti),利(li)(li)用(yong)加(jia)(jia)熱(re)(re)二元(yuan)熔(rong)(rong)(rong)(rong)鹽(yan)(yan)或三元(yuan)熔(rong)(rong)(rong)(rong)鹽(yan)(yan)作為加(jia)(jia)熱(re)(re)介質。一般這種加(jia)(jia)熱(re)(re)方(fang)式與熔(rong)(rong)(rong)(rong)鹽(yan)(yan)罐組(zu)成一個整體(ti),當常(chang)溫(wen)(wen)下的硝(xiao)鹽(yan)(yan)倒(dao)入熔(rong)(rong)(rong)(rong)鹽(yan)(yan)罐中(zhong)以后,利(li)(li)用(yong)熔(rong)(rong)(rong)(rong)鹽(yan)(yan)罐內的少量電(dian)熱(re)(re)元(yuan)件給(gei)(gei)其預熱(re)(re),使之(zhi)變為液(ye)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(wang)加(jia)(jia)熱(re)(re)器內部流(liu),進一步給(gei)(gei)熔(rong)(rong)(rong)(rong)鹽(yan)(yan)增(zeng)溫(wen)(wen),到(dao)達熔(rong)(rong)(rong)(rong)鹽(yan)(yan)加(jia)(jia)熱(re)(re)器出口(kou)處已經基(ji)本(ben)完成加(jia)(jia)熱(re)(re)的目的,并與用(yong)戶的用(yong)熱(re)(re)設備形(xing)成一個循環的整體(ti),源源不斷的給(gei)(gei)其加(jia)(jia)熱(re)(re),從而滿足工藝的要求。
■熔鹽(yan)電(dian)加熱器應(ying)用范圍:
熔鹽電(dian)加(jia)熱(re)器(qi)廣(guang)泛(fan)應用于儲(chu)能(neng)、儲(chu)熱(re)、火(huo)電(dian)調峰、化(hua)肥(fei)、三聚(ju)氫胺(an)、氧化(hua)鋁等(deng)高溫加(jia)熱(re)生產(chan)工藝。
■熔鹽電加熱(re)器(qi)控制系統概(gai)述:
1、有常規的電氣(qi)保護,如流量和短路(lu)保護等。
2、有一套(tao)獨立于溫(wen)度控制(zhi)的超(chao)溫(wen)報警系統(tong),當電(dian)加(jia)熱(re)器(qi)內部溫(wen)度超(chao)過計定值(zhi)時,它(ta)將不可(ke)自(zi)動復(fu)位地關閉電(dian)加(jia)熱(re)器(qi),并(bing)輸出一個觸點(dian)信號。
3、有一(yi)套獨立(li)的低(di)液(ye)(ye)位(wei)報警,當液(ye)(ye)位(wei)低(di)于要求值時(shi),它將(jiang)自動(dong)關(guan)閉電加熱(re)器,并輸出一(yi)個信號。
4、提供數(shu)個聯鎖(suo)接口,以便(bian)和其(qi)它(ta)設(she)備(bei)如泵、流(liu)量(liang)(壓力)開(kai)關等裝置聯鎖(suo),確保加熱器加熱時有(you)一定流(liu)量(liang)的介質在流(liu)動(dong),保證系(xi)統的安全。
5、控(kong)制可(ke)以向DCS系統(tong)提(ti)供加熱(re)系統(tong)處于運行、停止、超溫報警、液位(wei)信(xin)(xin)號(低(di)液位(wei)報警)、互鎖狀態、溫度信(xin)(xin)號(4~20mA)等信(xin)(xin)號,除(chu)溫度信(xin)(xin)號外,它(ta)們(men)均為無(wu)源觸點;可(ke)以接(jie)受DCS發出的啟動、停止操作命令,要求的觸點容量亦為220V 1A。
6、具(ju)有(you)(you)PID溫(wen)度調節功能(neng),加熱(re)(re)系統可(ke)以(yi)通(tong)過程序設(she)置(zhi)介質的(de)(de)升溫(wen)曲線(xian),并能(neng)在流(liu)量不足(zu)或停止加熱(re)(re)后(hou),根據工(gong)藝要求(qiu)控(kong)(kong)制(zhi)泵,本(ben)控(kong)(kong)制(zhi)系統采(cai)用多(duo)級(ji)控(kong)(kong)制(zhi)技術(shu),即把加熱(re)(re)器分成幾組(zu),其中一組(zu)也就是很(hen)(hen)大的(de)(de)一組(zu)可(ke)以(yi)無級(ji)調壓(ya),根據出口溫(wen)度,經運(yun)算后(hou),控(kong)(kong)制(zhi)系統自動(dong)控(kong)(kong)制(zhi)加熱(re)(re)器每組(zu)的(de)(de)通(tong)斷和(he)另一組(zu)加熱(re)(re)器的(de)(de)輸出功率,達(da)(da)到(dao)無級(ji)調功。這樣,能(neng)很(hen)(hen)有(you)(you)效地達(da)(da)到(dao)提高控(kong)(kong)溫(wen)精度的(de)(de)目(mu)的(de)(de)。