防(fang)爆(bao)電加(jia)熱(re)器內部高壓系統可以向(xiang)DCS系統提(ti)供加(jia)熱(re)器處于運行、高溫、故障(zhang)、停運等報警信號,也(ye)可以接(jie)受(shou)DCS發出的自動(dong)、停運等操作(zuo)口(kou)號,而(er)且對防(fang)爆(bao)電加(jia)熱(re)器系統增設了可靠安全的監測裝置,但是(shi)防(fang)爆(bao)電加(jia)熱(re)器價格參考相對來講也(ye)較高。
風道電加熱(re)器關于(yu)(yu)(yu)加熱(re)器出(chu)口水溫(wen)的操(cao)(cao)控(kong)(kong)體系,咱們能(neng)夠選(xuan)用(yong)水出(chu)口溫(wen)度(du)(du)為(wei)被控(kong)(kong)參量,燃(ran)料流量為(wei)操(cao)(cao)控(kong)(kong)變(bian)(bian)量,來進(jin)行剖(pou)析(xi)。一起(qi)該體系也歸(gui)于(yu)(yu)(yu)溫(wen)度(du)(du)操(cao)(cao)控(kong)(kong)體系,具(ju)有滯(zhi)(zhi)后(hou)較(jiao)大、純滯(zhi)(zhi)后(hou)時(shi)刻較(jiao)長(chang)、擾(rao)(rao)動(dong)幅(fu)值(zhi)(zhi)大、負荷改(gai)變(bian)(bian)頻(pin)(pin)頻(pin)(pin)、劇烈(lie)等(deng)特點。關于(yu)(yu)(yu)動(dong)態特性雜亂、存在多種擾(rao)(rao)動(dong)或擾(rao)(rao)動(dong)起(qi)伏(fu)較(jiao)大,操(cao)(cao)控(kong)(kong)質量要(yao)求(qiu)高的生產進(jin)程,用(yong)簡略操(cao)(cao)控(kong)(kong)體系無法(fa)完成良(liang)好的功能(neng),也滿意(yi)不(bu)了工藝操(cao)(cao)控(kong)(kong)精度(du)(du)要(yao)求(qiu),而(er)串級操(cao)(cao)控(kong)(kong)體系歸(gui)于(yu)(yu)(yu)雜亂操(cao)(cao)控(kong)(kong)體系,用(yong)于(yu)(yu)(yu)目(mu)標容量滯(zhi)(zhi)后(hou)較(jiao)大、純滯(zhi)(zhi)后(hou)時(shi)刻較(jiao)長(chang)、擾(rao)(rao)動(dong)幅(fu)值(zhi)(zhi)大、負荷改(gai)變(bian)(bian)頻(pin)(pin)頻(pin)(pin)、劇烈(lie)的被控(kong)(kong)進(jin)程,所以這時(shi)能(neng)夠考慮用(yong)串級操(cao)(cao)控(kong)(kong)體系。
防爆電加熱器假如呈現外部攪擾,使穩態工況遭到損壞,串級操控體系當即開端操控作業。依據擾動施加點的方位不同, 本體系完成了防爆電加熱器內溫度的操控的功用,和完成了防爆電加熱器出口水溫操控的功用。被控變量,操控變量的挑選被控主變量為出口水溫,被控副變量為加熱器內的溫度,操控主變量為燃料閥的開度,操控副變量為給水閥的開度。防爆電加熱器的挑選溫度傳感器選用溫度傳感器鉑電阻Pt1000。由于鉑熱電阻的物理化學功能在高溫和氧化性介質中很穩定,它能用作工業測溫元件,且此元件線性較好。在0—100攝氏度時,上限非線性誤差小于0.5攝氏度。