■熔鹽電加熱器:
熔(rong)(rong)(rong)鹽(yan)(yan)電(dian)(dian)(dian)加(jia)熱(re)(re)(re)(re)器(qi)是一種電(dian)(dian)(dian)加(jia)熱(re)(re)(re)(re)設(she)備,用于對流動的(de)(de)(de)(de)液(ye)態、氣態介質的(de)(de)(de)(de)升溫、保溫、加(jia)熱(re)(re)(re)(re)。熔(rong)(rong)(rong)鹽(yan)(yan)電(dian)(dian)(dian)加(jia)熱(re)(re)(re)(re)器(qi)利(li)用特殊(shu)管(guan)狀電(dian)(dian)(dian)熱(re)(re)(re)(re)元(yuan)件(jian)結合法蘭集束的(de)(de)(de)(de)形式與壓力容器(qi)組成一個供熱(re)(re)(re)(re)整(zheng)體(ti),利(li)用加(jia)熱(re)(re)(re)(re)二元(yuan)熔(rong)(rong)(rong)鹽(yan)(yan)或三元(yuan)熔(rong)(rong)(rong)鹽(yan)(yan)作為(wei)加(jia)熱(re)(re)(re)(re)介質。一般(ban)這(zhe)種加(jia)熱(re)(re)(re)(re)方式與熔(rong)(rong)(rong)鹽(yan)(yan)罐組成一個整(zheng)體(ti),當常溫下的(de)(de)(de)(de)硝鹽(yan)(yan)倒入(ru)熔(rong)(rong)(rong)鹽(yan)(yan)罐中以(yi)后,利(li)用熔(rong)(rong)(rong)鹽(yan)(yan)罐內(nei)的(de)(de)(de)(de)少量電(dian)(dian)(dian)熱(re)(re)(re)(re)元(yuan)件(jian)給(gei)其(qi)預熱(re)(re)(re)(re),使之(zhi)變為(wei)液(ye)態,然(ran)后通(tong)過熔(rong)(rong)(rong)鹽(yan)(yan)泵抽取熔(rong)(rong)(rong)鹽(yan)(yan)往加(jia)熱(re)(re)(re)(re)器(qi)內(nei)部流,進(jin)一步給(gei)熔(rong)(rong)(rong)鹽(yan)(yan)增溫,到達熔(rong)(rong)(rong)鹽(yan)(yan)加(jia)熱(re)(re)(re)(re)器(qi)出口處已經基本完成加(jia)熱(re)(re)(re)(re)的(de)(de)(de)(de)目的(de)(de)(de)(de),并與用戶的(de)(de)(de)(de)用熱(re)(re)(re)(re)設(she)備形成一個循環(huan)的(de)(de)(de)(de)整(zheng)體(ti),源源不斷的(de)(de)(de)(de)給(gei)其(qi)加(jia)熱(re)(re)(re)(re),從而滿足工(gong)藝的(de)(de)(de)(de)要(yao)求。
■熔鹽電(dian)加熱器(qi)應用范圍:
熔(rong)鹽電加熱(re)器廣泛應用于儲(chu)能、儲(chu)熱(re)、火(huo)電調峰、化(hua)肥(fei)、三聚氫胺、氧(yang)化(hua)鋁(lv)等(deng)高溫加熱(re)生產工(gong)藝。
■熔鹽(yan)電加熱器控制系(xi)統概述:
1、有常(chang)規的電氣保護,如流(liu)量和(he)短路保護等。
2、有一套獨立于溫度(du)控(kong)制的超溫報警系統,當(dang)電(dian)加熱(re)器(qi)內部(bu)溫度(du)超過計定值(zhi)時,它將不可自(zi)動(dong)復位地(di)關閉電(dian)加熱(re)器(qi),并輸(shu)出一個(ge)觸點信(xin)號。
3、有一套(tao)獨立的低(di)液位報警,當(dang)液位低(di)于要求(qiu)值時,它(ta)將(jiang)自(zi)動關閉電加熱器,并輸出一個信號。
4、提(ti)供數個聯鎖接口,以便和其(qi)它設(she)備如泵(beng)、流量(liang)(壓力)開關等裝(zhuang)置聯鎖,確保加(jia)熱器加(jia)熱時有一定流量(liang)的(de)介質(zhi)在流動(dong),保證系統的(de)安全。
5、控制可以向DCS系統提供(gong)加熱系統處于運行、停止、超溫(wen)報(bao)警、液(ye)位信號(hao)(低液(ye)位報(bao)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,它們均為無(wu)源觸(chu)點;可以接(jie)受DCS發出的啟動(dong)、停止操作命令,要求的觸(chu)點容量亦(yi)為220V 1A。
6、具有(you)PID溫(wen)度(du)調(diao)節功(gong)能(neng),加(jia)熱(re)(re)系統(tong)可以通過程序設置介質的(de)(de)升溫(wen)曲線,并(bing)能(neng)在流量不(bu)足或停止(zhi)加(jia)熱(re)(re)后(hou),根(gen)據工藝要(yao)求控(kong)制(zhi)(zhi)泵,本控(kong)制(zhi)(zhi)系統(tong)采用(yong)多級控(kong)制(zhi)(zhi)技術(shu),即把加(jia)熱(re)(re)器分成幾(ji)組(zu),其中一(yi)組(zu)也就是(shi)很(hen)大的(de)(de)一(yi)組(zu)可以無(wu)級調(diao)壓,根(gen)據出口溫(wen)度(du),經運算后(hou),控(kong)制(zhi)(zhi)系統(tong)自動控(kong)制(zhi)(zhi)加(jia)熱(re)(re)器每(mei)組(zu)的(de)(de)通斷和另(ling)一(yi)組(zu)加(jia)熱(re)(re)器的(de)(de)輸出功(gong)率,達到(dao)無(wu)級調(diao)功(gong)。這樣(yang),能(neng)很(hen)有(you)效地達到(dao)提(ti)高控(kong)溫(wen)精(jing)度(du)的(de)(de)目的(de)(de)。