■熔鹽電加熱器:
熔(rong)(rong)(rong)(rong)鹽(yan)(yan)電(dian)加熱(re)(re)器是一(yi)種(zhong)電(dian)加熱(re)(re)設(she)(she)備,用(yong)(yong)于對(dui)流(liu)(liu)動(dong)的(de)(de)液態、氣態介(jie)(jie)質的(de)(de)升(sheng)溫(wen)、保(bao)溫(wen)、加熱(re)(re)。熔(rong)(rong)(rong)(rong)鹽(yan)(yan)電(dian)加熱(re)(re)器利(li)用(yong)(yong)特殊管狀電(dian)熱(re)(re)元件(jian)結合(he)法蘭集束的(de)(de)形(xing)式與(yu)壓力容器組(zu)成一(yi)個(ge)供(gong)熱(re)(re)整(zheng)體,利(li)用(yong)(yong)加熱(re)(re)二元熔(rong)(rong)(rong)(rong)鹽(yan)(yan)或三元熔(rong)(rong)(rong)(rong)鹽(yan)(yan)作(zuo)為(wei)加熱(re)(re)介(jie)(jie)質。一(yi)般這種(zhong)加熱(re)(re)方式與(yu)熔(rong)(rong)(rong)(rong)鹽(yan)(yan)罐(guan)(guan)組(zu)成一(yi)個(ge)整(zheng)體,當常(chang)溫(wen)下的(de)(de)硝鹽(yan)(yan)倒入熔(rong)(rong)(rong)(rong)鹽(yan)(yan)罐(guan)(guan)中以后,利(li)用(yong)(yong)熔(rong)(rong)(rong)(rong)鹽(yan)(yan)罐(guan)(guan)內的(de)(de)少(shao)量電(dian)熱(re)(re)元件(jian)給其(qi)預熱(re)(re),使之變為(wei)液態,然后通過熔(rong)(rong)(rong)(rong)鹽(yan)(yan)泵(beng)抽取熔(rong)(rong)(rong)(rong)鹽(yan)(yan)往(wang)加熱(re)(re)器內部流(liu)(liu),進一(yi)步給熔(rong)(rong)(rong)(rong)鹽(yan)(yan)增溫(wen),到達(da)熔(rong)(rong)(rong)(rong)鹽(yan)(yan)加熱(re)(re)器出口處已經基本完成加熱(re)(re)的(de)(de)目的(de)(de),并與(yu)用(yong)(yong)戶的(de)(de)用(yong)(yong)熱(re)(re)設(she)(she)備形(xing)成一(yi)個(ge)循(xun)環(huan)的(de)(de)整(zheng)體,源源不斷的(de)(de)給其(qi)加熱(re)(re),從而滿足(zu)工藝的(de)(de)要求。
■熔鹽電加熱(re)器應用范圍(wei):
熔鹽電加熱(re)器廣(guang)泛應用于(yu)儲能、儲熱(re)、火電調峰、化(hua)肥、三聚氫(qing)胺、氧(yang)化(hua)鋁等高(gao)溫(wen)加熱(re)生產工藝。
■熔鹽電加熱器控制系統概述:
1、有常規的電氣保(bao)(bao)護(hu),如(ru)流量和(he)短(duan)路保(bao)(bao)護(hu)等。
2、有(you)一(yi)套獨(du)立于(yu)溫度控制(zhi)的超(chao)溫報警系統(tong),當電加熱(re)(re)器內(nei)部溫度超(chao)過計(ji)定值時(shi),它(ta)將不可(ke)自動復位地關閉電加熱(re)(re)器,并(bing)輸出一(yi)個觸點信(xin)號。
3、有一(yi)套獨立的(de)低液位報警(jing),當液位低于要求值時,它(ta)將自動關閉電(dian)加熱器,并(bing)輸出一(yi)個信(xin)號。
4、提供(gong)數個聯鎖(suo)(suo)接口,以便(bian)和其它設(she)備如(ru)泵、流量(壓力)開關等裝置聯鎖(suo)(suo),確保加(jia)熱器加(jia)熱時有一(yi)定流量的介質在流動(dong),保證系統的安全(quan)。
5、控制(zhi)可以(yi)向DCS系(xi)統(tong)提供加(jia)熱系(xi)統(tong)處于運行、停(ting)止、超溫報(bao)警(jing)、液位信號(低(di)液位報(bao)警(jing))、互鎖(suo)狀態、溫度信號(4~20mA)等信號,除溫度信號外,它們均(jun)為無源觸點;可以(yi)接(jie)受DCS發出(chu)的啟動(dong)、停(ting)止操作命令(ling),要求的觸點容量(liang)亦為220V 1A。
6、具(ju)有PID溫度調節功能,加(jia)(jia)熱(re)系統(tong)(tong)可(ke)(ke)以通過程序(xu)設(she)置(zhi)介質(zhi)的(de)升溫曲線,并能在流量不足或停止加(jia)(jia)熱(re)后,根據工藝(yi)要求(qiu)控(kong)(kong)(kong)制(zhi)泵,本控(kong)(kong)(kong)制(zhi)系統(tong)(tong)采(cai)用(yong)多(duo)級(ji)控(kong)(kong)(kong)制(zhi)技術,即把加(jia)(jia)熱(re)器分成幾組(zu)(zu),其中(zhong)一組(zu)(zu)也就是很(hen)大的(de)一組(zu)(zu)可(ke)(ke)以無級(ji)調壓(ya),根據出口(kou)溫度,經(jing)運算后,控(kong)(kong)(kong)制(zhi)系統(tong)(tong)自(zi)動控(kong)(kong)(kong)制(zhi)加(jia)(jia)熱(re)器每組(zu)(zu)的(de)通斷(duan)和另一組(zu)(zu)加(jia)(jia)熱(re)器的(de)輸(shu)出功率,達到無級(ji)調功。這樣,能很(hen)有效(xiao)地(di)達到提高控(kong)(kong)(kong)溫精度的(de)目的(de)。