傳統的燃燒控制方式一般采用連續比例控溫。這種控溫方式在小負荷供熱控制中由于燃氣管路比較細。控制系統的響應能力很難滿足流量變化的需要，因此控溫誤差會有較大的波動。再者當燃燒負荷低于40％時。空氣過剩系數會增大，這就意味著煙氣的含氧量會提高，增大了工件的表面氧化。過剩的空氣還會帶走更多熱量，從而降低了燃燒效率，浪費了能源。為了解決這個問題，采取連續比例控溫+脈沖燃燒控溫方式進行爐溫的智能控制。這種控溫方式適合應用在有鍛造工藝溫度曲線要求的鍛造加熱爐上。 

    連續(xu)比例控(kong)(kong)溫(wen)方式(shi)是(shi)一(yi)種(zhong)比較傳統的(de)控(kong)(kong)溫(wen)方式(shi)，這(zhe)里(li)不作詳(xiang)細(xi)介紹(shao)。脈(mo)(mo)沖(chong)燃(ran)燒(shao)控(kong)(kong)溫(wen)方式(shi)是(shi)一(yi)種(zhong)間(jian)斷燃(ran)燒(shao)的(de)方式(shi)．使用(yong)脈(mo)(mo)寬調制(zhi)的(de)方法通過調節(jie)燒(shao)嘴燃(ran)燒(shao)時間(jian)的(de)占空比實現溫(wen)度控(kong)(kong)制(zhi)。采用(yong)脈(mo)(mo)沖(chong)燃(ran)燒(shao)控(kong)(kong)溫(wen)時燒(shao)嘴只會有滿負荷或關閉兩種(zhong)狀(zhuang)(zhuang)態。燒(shao)嘴滿負荷時各閥門的(de)位置都是(shi)事(shi)先(xian)調節(jie)好的(de)，這(zhe)樣就保(bao)證了燒(shao)嘴一(yi)直保(bao)持(chi)最佳(jia)燃(ran)燒(shao)狀(zhuang)(zhuang)態。

    簡要(yao)介紹脈(mo)沖燃(ran)燒(shao)(shao)(shao)控(kong)溫工(gong)作(zuo)方式：PID運算(suan)輸出(chu)功率(lv)負荷(he)變(bian)化信號通過脈(mo)沖分頻系統將功率(lv)負荷(he)變(bian)化信號轉變(bian)為(wei)(wei)燒(shao)(shao)(shao)嘴(zui)大火(huo)工(gong)作(zuo)的(de)時(shi)(shi)間并按脈(mo)沖周期轉換動作(zuo)。如當前輸出(chu)功率(lv)負荷(he)為(wei)(wei)25％．則第一個脈(mo)沖時(shi)(shi)段燒(shao)(shao)(shao)嘴(zui)為(wei)(wei)大火(huo)工(gong)作(zuo)，第二至第四個脈(mo)沖時(shi)(shi)段為(wei)(wei)關閉，第五個脈(mo)沖時(shi)(shi)段再次工作，通(tong)過此方式不斷地循環。

   由于脈沖控制方式需要(yao)頻繁的(de)(de)點(dian)(dian)燃(ran)(ran)燒(shao)(shao)嘴(zui)(zui)(zui)，所(suo)以(yi)燒(shao)(shao)嘴(zui)(zui)(zui)點(dian)(dian)火(huo)必須安(an)全可靠(kao)，為(wei)了燃(ran)(ran)燒(shao)(shao)安(an)全每個燒(shao)(shao)嘴(zui)(zui)(zui)配有(you)高(gao)壓點(dian)(dian)火(huo)變壓器和(he)點(dian)(dian)火(huo)電(dian)極實現(xian)自(zi)(zi)動點(dian)(dian)火(huo)，配有(you)火(huo)焰監(jian)測(ce)器和(he)檢測(ce)電(dian)極來監(jian)測(ce)氣(qi)體燃(ran)(ran)燒(shao)(shao)時產(chan)生的(de)(de)離子(zi)電(dian)流，從而監(jian)控燒(shao)(shao)嘴(zui)(zui)(zui)的(de)(de)燃(ran)(ran)燒(shao)(shao)狀(zhuang)態。當燒(shao)(shao)嘴(zui)(zui)(zui)因故(gu)障(zhang)熄滅時能(neng)自(zi)(zi)動切斷(duan)燃(ran)(ran)氣(qi)管路(lu)上的(de)(de)電(dian)磁閥并報警(jing)，以(yi)免發生事故(gu)。

    燒(shao)(shao)嘴(zui)(zui)點(dian)(dian)(dian)火(huo)(huo)(huo)分(fen)為手(shou)動(dong)(dong)和自動(dong)(dong)兩種方(fang)式。在(zai)(zai)手(shou)動(dong)(dong)情況(kuang)下，操作工可以在(zai)(zai)現場通過燒(shao)(shao)嘴(zui)(zui)控(kong)(kong)制(zhi)器(qi)上(shang)的(de)點(dian)(dian)(dian)火(huo)(huo)(huo)按(an)(an)鈕或(huo)者上(shang)位(wei)機(ji)(ji)顯示(shi)器(qi)上(shang)的(de)點(dian)(dian)(dian)火(huo)(huo)(huo)按(an)(an)鈕給(gei)出(chu)點(dian)(dian)(dian)火(huo)(huo)(huo)指(zhi)令(ling)(ling)。燒(shao)(shao)嘴(zui)(zui)控(kong)(kong)制(zhi)器(qi)得到點(dian)(dian)(dian)火(huo)(huo)(huo)指(zhi)令(ling)(ling)后(hou)，點(dian)(dian)(dian)火(huo)(huo)(huo)變壓(ya)器(qi)得電(dian)放出(chu)點(dian)(dian)(dian)火(huo)(huo)(huo)電(dian)弧，同(tong)(tong)時(shi)燃氣(qi)(qi)電(dian)磁閥(fa)打開(kai)將燃氣(qi)(qi)送(song)入燒(shao)(shao)嘴(zui)(zui)。點(dian)(dian)(dian)火(huo)(huo)(huo)時(shi)間根(gen)據不同(tong)(tong)的(de)燒(shao)(shao)嘴(zui)(zui)控(kong)(kong)制(zhi)器(qi)有所(suo)區別，一般點(dian)(dian)(dian)火(huo)(huo)(huo)時(shi)間持(chi)續在(zai)(zai)5s左右。在(zai)(zai)點(dian)(dian)(dian)火(huo)(huo)(huo)期間，如果(guo)燒(shao)(shao)嘴(zui)(zui)點(dian)(dian)(dian)火(huo)(huo)(huo)成功，點(dian)(dian)(dian)火(huo)(huo)(huo)變壓(ya)器(qi)自動(dong)(dong)斷(duan)電(dian)，燃氣(qi)(qi)電(dian)磁閥(fa)保持(chi)打開(kai)，同(tong)(tong)時(shi)在(zai)(zai)燒(shao)(shao)嘴(zui)(zui)控(kong)(kong)制(zhi)器(qi)和上(shang)位(wei)機(ji)(ji)上(shang)有燒(shao)(shao)嘴(zui)(zui)運行(xing)(燃燒(shao)(shao))指(zhi)示(shi)：如果(guo)燒(shao)(shao)嘴(zui)(zui)沒有點(dian)(dian)(dian)燃，燒(shao)(shao)嘴(zui)(zui)控(kong)(kong)制(zhi)器(qi)會自動(dong)(dong)切斷(duan)燃氣(qi)(qi)電(dian)磁閥(fa)．點(dian)(dian)(dian)火(huo)(huo)(huo)變壓(ya)器(qi)斷(duan)電(dian)，同(tong)(tong)時(shi)在(zai)(zai)燒(shao)(shao)嘴(zui)(zui)控(kong)(kong)制(zhi)器(qi)和上(shang)位(wei)機(ji)(ji)上(shang)會有報(bao)警指(zhi)示(shi)，提醒操作工判斷(duan)并排除故障后(hou)．重新點(dian)(dian)(dian)火(huo)(huo)(huo)。在(zai)(zai)自動(dong)(dong)情況(kuang)下，點(dian)(dian)(dian)火(huo)(huo)(huo)指(zhi)令(ling)(ling)由在(zai)(zai)PLC中運行(xing)的(de)程序給(gei)出(chu)點(dian)(dian)(dian)火(huo)(huo)(huo)時(shi)序與(yu)手(shou)動(dong)(dong)情況(kuang)下一致．運行(xing)及報(bao)警指(zhi)示(shi)相(xiang)同(tong)(tong)。