■熔鹽電加熱器:
熔(rong)(rong)(rong)鹽(yan)電(dian)(dian)(dian)加(jia)熱(re)(re)(re)(re)器(qi)是(shi)一種電(dian)(dian)(dian)加(jia)熱(re)(re)(re)(re)設備,用(yong)于對流(liu)動的(de)(de)(de)液(ye)態(tai)(tai)、氣態(tai)(tai)介質的(de)(de)(de)升溫(wen)、保溫(wen)、加(jia)熱(re)(re)(re)(re)。熔(rong)(rong)(rong)鹽(yan)電(dian)(dian)(dian)加(jia)熱(re)(re)(re)(re)器(qi)利(li)用(yong)特(te)殊管狀電(dian)(dian)(dian)熱(re)(re)(re)(re)元(yuan)件結(jie)合法蘭集束的(de)(de)(de)形(xing)式與(yu)壓力容器(qi)組成(cheng)(cheng)一個(ge)供熱(re)(re)(re)(re)整(zheng)(zheng)體,利(li)用(yong)加(jia)熱(re)(re)(re)(re)二元(yuan)熔(rong)(rong)(rong)鹽(yan)或三(san)元(yuan)熔(rong)(rong)(rong)鹽(yan)作為加(jia)熱(re)(re)(re)(re)介質。一般這種加(jia)熱(re)(re)(re)(re)方(fang)式與(yu)熔(rong)(rong)(rong)鹽(yan)罐組成(cheng)(cheng)一個(ge)整(zheng)(zheng)體,當常溫(wen)下的(de)(de)(de)硝鹽(yan)倒入熔(rong)(rong)(rong)鹽(yan)罐中以(yi)后,利(li)用(yong)熔(rong)(rong)(rong)鹽(yan)罐內的(de)(de)(de)少(shao)量電(dian)(dian)(dian)熱(re)(re)(re)(re)元(yuan)件給其(qi)預熱(re)(re)(re)(re),使之變為液(ye)態(tai)(tai),然后通過熔(rong)(rong)(rong)鹽(yan)泵抽取熔(rong)(rong)(rong)鹽(yan)往加(jia)熱(re)(re)(re)(re)器(qi)內部(bu)流(liu),進一步給熔(rong)(rong)(rong)鹽(yan)增溫(wen),到(dao)達熔(rong)(rong)(rong)鹽(yan)加(jia)熱(re)(re)(re)(re)器(qi)出口處已經(jing)基本完成(cheng)(cheng)加(jia)熱(re)(re)(re)(re)的(de)(de)(de)目的(de)(de)(de),并(bing)與(yu)用(yong)戶的(de)(de)(de)用(yong)熱(re)(re)(re)(re)設備形(xing)成(cheng)(cheng)一個(ge)循環的(de)(de)(de)整(zheng)(zheng)體,源源不斷(duan)的(de)(de)(de)給其(qi)加(jia)熱(re)(re)(re)(re),從而滿足工藝(yi)的(de)(de)(de)要求。
■熔鹽電加熱器(qi)應用范圍:
熔(rong)鹽(yan)電(dian)加(jia)(jia)熱器廣泛應用(yong)于儲能、儲熱、火電(dian)調(diao)峰、化(hua)肥、三聚氫胺、氧化(hua)鋁(lv)等高溫加(jia)(jia)熱生(sheng)產工藝。
■熔鹽電(dian)加熱(re)器控制系統概述:
1、有(you)常(chang)規的(de)電(dian)氣保護,如流量和短路保護等。
2、有一套獨立于溫度控制的超溫報警系統(tong),當電(dian)加熱器內部溫度超過計定值時,它(ta)將不可自動復位地關閉電(dian)加熱器,并輸出一個(ge)觸點信號。
3、有一(yi)套獨立的(de)低液(ye)位報警,當液(ye)位低于要求(qiu)值時(shi),它將自動關閉(bi)電加熱器,并輸出一(yi)個信號(hao)。
4、提供數(shu)個聯(lian)鎖接口,以便和(he)其(qi)它設備如(ru)泵、流(liu)(liu)量(liang)(壓力)開關等裝(zhuang)置聯(lian)鎖,確保加熱器加熱時有一定流(liu)(liu)量(liang)的介質(zhi)在流(liu)(liu)動,保證系統(tong)的安(an)全(quan)。
5、控制可以向DCS系統提供加(jia)熱系統處于運行、停(ting)止、超溫報警(jing)(jing)、液位信號(hao)(hao)(低液位報警(jing)(jing))、互(hu)鎖狀態、溫度信號(hao)(hao)(4~20mA)等信號(hao)(hao),除溫度信號(hao)(hao)外,它(ta)們均(jun)為無源觸(chu)點;可以接受DCS發出的啟動、停(ting)止操作命令,要求的觸(chu)點容量亦為220V 1A。
6、具有PID溫度(du)調節功能(neng),加熱(re)(re)系(xi)(xi)(xi)統可以通(tong)(tong)過程序(xu)設(she)置(zhi)介質的(de)升溫曲線,并(bing)能(neng)在流量不(bu)足(zu)或停止加熱(re)(re)后,根(gen)據工藝要求控(kong)(kong)(kong)(kong)制(zhi)泵,本(ben)控(kong)(kong)(kong)(kong)制(zhi)系(xi)(xi)(xi)統采用多級(ji)控(kong)(kong)(kong)(kong)制(zhi)技術,即把加熱(re)(re)器分成幾組(zu),其中一(yi)組(zu)也就是(shi)很大(da)的(de)一(yi)組(zu)可以無(wu)級(ji)調壓,根(gen)據出口溫度(du),經運算后,控(kong)(kong)(kong)(kong)制(zhi)系(xi)(xi)(xi)統自動(dong)控(kong)(kong)(kong)(kong)制(zhi)加熱(re)(re)器每組(zu)的(de)通(tong)(tong)斷(duan)和另一(yi)組(zu)加熱(re)(re)器的(de)輸出功率,達(da)到(dao)無(wu)級(ji)調功。這樣,能(neng)很有效(xiao)地(di)達(da)到(dao)提高(gao)控(kong)(kong)(kong)(kong)溫精度(du)的(de)目的(de)。