防爆(bao)電加熱(re)器(qi)內(nei)部高(gao)(gao)壓系統(tong)(tong)(tong)可(ke)以向DCS系統(tong)(tong)(tong)提供(gong)加熱(re)器(qi)處于(yu)運行、高(gao)(gao)溫、故障、停運等報警信號(hao),也可(ke)以接受DCS發出的(de)自動(dong)、停運等操作口(kou)號(hao),而且(qie)對防爆(bao)電加熱(re)器(qi)系統(tong)(tong)(tong)增(zeng)設了(le)可(ke)靠安全的(de)監(jian)測裝置,但是防爆(bao)電加熱(re)器(qi)價格參考(kao)相對來講也較高(gao)(gao)。
風道(dao)電加熱器(qi)關于加熱器(qi)出口(kou)水溫(wen)(wen)的(de)操控(kong)(kong)(kong)體(ti)系(xi)(xi),咱們能(neng)(neng)夠(gou)選用(yong)水出口(kou)溫(wen)(wen)度(du)(du)為被控(kong)(kong)(kong)參量(liang),燃料(liao)流量(liang)為操控(kong)(kong)(kong)變(bian)量(liang),來進行(xing)剖析。一起該體(ti)系(xi)(xi)也歸(gui)于溫(wen)(wen)度(du)(du)操控(kong)(kong)(kong)體(ti)系(xi)(xi),具有滯后(hou)較(jiao)大(da)、純滯后(hou)時刻(ke)較(jiao)長(chang)、擾(rao)動幅值大(da)、負(fu)荷(he)(he)改(gai)變(bian)頻頻、劇烈(lie)等特點(dian)。關于動態特性雜(za)亂(luan)、存(cun)在(zai)多種擾(rao)動或(huo)擾(rao)動起伏較(jiao)大(da),操控(kong)(kong)(kong)質量(liang)要求(qiu)高(gao)的(de)生(sheng)產進程,用(yong)簡略操控(kong)(kong)(kong)體(ti)系(xi)(xi)無法完成良好(hao)的(de)功能(neng)(neng),也滿意(yi)不了工藝(yi)操控(kong)(kong)(kong)精度(du)(du)要求(qiu),而串(chuan)級操控(kong)(kong)(kong)體(ti)系(xi)(xi)歸(gui)于雜(za)亂(luan)操控(kong)(kong)(kong)體(ti)系(xi)(xi),用(yong)于目標容量(liang)滯后(hou)較(jiao)大(da)、純滯后(hou)時刻(ke)較(jiao)長(chang)、擾(rao)動幅值大(da)、負(fu)荷(he)(he)改(gai)變(bian)頻頻、劇烈(lie)的(de)被控(kong)(kong)(kong)進程,所以這時能(neng)(neng)夠(gou)考慮用(yong)串(chuan)級操控(kong)(kong)(kong)體(ti)系(xi)(xi)。
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。