■熔鹽電加熱器:
熔(rong)(rong)(rong)鹽(yan)(yan)(yan)電(dian)(dian)加熱(re)(re)(re)器(qi)(qi)是(shi)一(yi)(yi)種電(dian)(dian)加熱(re)(re)(re)設(she)備,用(yong)(yong)于對流動的液態(tai)、氣態(tai)介質的升溫(wen)、保溫(wen)、加熱(re)(re)(re)。熔(rong)(rong)(rong)鹽(yan)(yan)(yan)電(dian)(dian)加熱(re)(re)(re)器(qi)(qi)利用(yong)(yong)特殊管(guan)狀電(dian)(dian)熱(re)(re)(re)元(yuan)件(jian)結合(he)法蘭集束(shu)的形式與壓力容器(qi)(qi)組成一(yi)(yi)個供熱(re)(re)(re)整體(ti)(ti),利用(yong)(yong)加熱(re)(re)(re)二元(yuan)熔(rong)(rong)(rong)鹽(yan)(yan)(yan)或三元(yuan)熔(rong)(rong)(rong)鹽(yan)(yan)(yan)作為(wei)(wei)加熱(re)(re)(re)介質。一(yi)(yi)般(ban)這種加熱(re)(re)(re)方式與熔(rong)(rong)(rong)鹽(yan)(yan)(yan)罐組成一(yi)(yi)個整體(ti)(ti),當(dang)常溫(wen)下的硝鹽(yan)(yan)(yan)倒入熔(rong)(rong)(rong)鹽(yan)(yan)(yan)罐中(zhong)以后,利用(yong)(yong)熔(rong)(rong)(rong)鹽(yan)(yan)(yan)罐內(nei)的少量電(dian)(dian)熱(re)(re)(re)元(yuan)件(jian)給其預熱(re)(re)(re),使之(zhi)變為(wei)(wei)液態(tai),然后通過(guo)熔(rong)(rong)(rong)鹽(yan)(yan)(yan)泵抽取(qu)熔(rong)(rong)(rong)鹽(yan)(yan)(yan)往(wang)加熱(re)(re)(re)器(qi)(qi)內(nei)部流,進(jin)一(yi)(yi)步給熔(rong)(rong)(rong)鹽(yan)(yan)(yan)增溫(wen),到達熔(rong)(rong)(rong)鹽(yan)(yan)(yan)加熱(re)(re)(re)器(qi)(qi)出口處已經基本(ben)完(wan)成加熱(re)(re)(re)的目的,并與用(yong)(yong)戶的用(yong)(yong)熱(re)(re)(re)設(she)備形成一(yi)(yi)個循環的整體(ti)(ti),源(yuan)源(yuan)不斷的給其加熱(re)(re)(re),從(cong)而滿足工藝(yi)的要(yao)求。
■熔(rong)鹽電(dian)加(jia)熱器應用(yong)范圍:
熔鹽電(dian)加熱(re)器廣泛應用于(yu)儲(chu)能、儲(chu)熱(re)、火電(dian)調(diao)峰、化(hua)肥(fei)、三聚氫胺(an)、氧化(hua)鋁等高溫(wen)加熱(re)生產工藝(yi)。
■熔鹽(yan)電加熱器控(kong)制系統概述:
1、有常規的(de)電氣保護,如流量和短(duan)路保護等。
2、有一套獨立于溫(wen)度控制的超溫(wen)報警系統,當電(dian)(dian)加熱器內部溫(wen)度超過(guo)計定值時,它將不可自動復位地(di)關閉電(dian)(dian)加熱器,并輸出一個(ge)觸點信(xin)號。
3、有(you)一套獨立的低(di)液位報警,當液位低(di)于要(yao)求值時(shi),它將自動關閉電加熱(re)器,并輸(shu)出(chu)一個信號(hao)。
4、提供數個聯鎖接口,以便和其(qi)它設備如(ru)泵、流(liu)量(壓(ya)力(li))開關等(deng)裝置聯鎖,確(que)保加熱(re)器(qi)加熱(re)時有(you)一定流(liu)量的(de)介質在流(liu)動(dong),保證系統(tong)的(de)安全。
5、控制可以向DCS系統(tong)提供加熱系統(tong)處于運行、停止、超溫(wen)(wen)報警、液(ye)位信號(hao)(低液(ye)位報警)、互鎖(suo)狀態(tai)、溫(wen)(wen)度信號(hao)(4~20mA)等(deng)信號(hao),除溫(wen)(wen)度信號(hao)外(wai),它們均為無源觸點(dian);可以接受DCS發出的啟動、停止操作命(ming)令,要求的觸點(dian)容量亦為220V 1A。
6、具有PID溫(wen)度(du)調節功(gong)(gong)能(neng),加熱(re)系(xi)統可(ke)以(yi)通過程序(xu)設(she)置介質的(de)升溫(wen)曲線,并(bing)能(neng)在流量(liang)不足或停止(zhi)加熱(re)后,根(gen)據(ju)工藝要(yao)求(qiu)控(kong)制泵(beng),本控(kong)制系(xi)統采用多級(ji)控(kong)制技術,即把加熱(re)器分成幾組,其中一組也(ye)就是很(hen)大的(de)一組可(ke)以(yi)無(wu)(wu)級(ji)調壓,根(gen)據(ju)出口溫(wen)度(du),經運算后,控(kong)制系(xi)統自動控(kong)制加熱(re)器每組的(de)通斷和另一組加熱(re)器的(de)輸出功(gong)(gong)率(lv),達到無(wu)(wu)級(ji)調功(gong)(gong)。這樣,能(neng)很(hen)有效地(di)達到提高(gao)控(kong)溫(wen)精(jing)度(du)的(de)目的(de)。