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。

    連續比例控溫方式是一種比較傳統的控溫方式，這里不作詳細介紹。脈沖燃燒控溫(wen)方(fang)式是(shi)一種(zhong)間斷燃(ran)燒(shao)的(de)方(fang)式．使用脈寬調制(zhi)的(de)方(fang)法通過調節燒(shao)嘴(zui)燃(ran)燒(shao)時(shi)(shi)間的(de)占空比實(shi)現溫(wen)度(du)控制(zhi)。采用脈沖燃(ran)燒(shao)控溫(wen)時(shi)(shi)燒(shao)嘴(zui)只會有(you)滿負荷或關閉兩種(zhong)狀態(tai)。燒(shao)嘴(zui)滿負荷時(shi)(shi)各閥門的(de)位置都是(shi)事先調節好的(de)，這樣就保證(zheng)了燒(shao)嘴(zui)一直保持最(zui)佳燃(ran)燒(shao)狀態(tai)。

    簡要介紹脈(mo)沖(chong)燃燒(shao)控溫(wen)工作(zuo)(zuo)方(fang)式(shi)：PID運算輸(shu)出功(gong)(gong)率負(fu)荷(he)(he)變(bian)化信號通過脈(mo)沖(chong)分頻(pin)系(xi)統將功(gong)(gong)率負(fu)荷(he)(he)變(bian)化信號轉變(bian)為(wei)(wei)燒(shao)嘴(zui)大火工作(zuo)(zuo)的時(shi)間并按脈(mo)沖(chong)周期轉換動(dong)作(zuo)(zuo)。如當前(qian)輸(shu)出功(gong)(gong)率負(fu)荷(he)(he)為(wei)(wei)25％．則第(di)一個(ge)脈(mo)沖(chong)時(shi)段(duan)燒(shao)嘴(zui)為(wei)(wei)大火工作(zuo)(zuo)，第(di)二至第(di)四個(ge)脈(mo)沖(chong)時(shi)段(duan)為(wei)(wei)關閉，第(di)五個(ge)脈(mo)沖(chong)時(shi)段(duan)再次工作(zuo)(zuo)，通過此(ci)方(fang)式(shi)不斷地循(xun)環。

   由于脈沖控制方式需(xu)要頻繁(fan)的點燃(ran)燒嘴(zui)，所以(yi)(yi)燒嘴(zui)點火(huo)必須安全(quan)(quan)可靠(kao)，為了(le)燃(ran)燒安全(quan)(quan)每(mei)個燒嘴(zui)配有高壓(ya)點火(huo)變(bian)壓(ya)器(qi)和(he)(he)點火(huo)電極(ji)實現自動(dong)點火(huo)，配有火(huo)焰監(jian)測器(qi)和(he)(he)檢測電極(ji)來監(jian)測氣體燃(ran)燒時產生的離子電流，從而監(jian)控燒嘴(zui)的燃(ran)燒狀態。當(dang)燒嘴(zui)因故障熄滅(mie)時能自動(dong)切斷(duan)燃(ran)氣管路(lu)上的電磁(ci)閥并報警，以(yi)(yi)免(mian)發生事故。

    燒(shao)(shao)嘴(zui)(zui)(zui)點(dian)(dian)火(huo)(huo)分為手(shou)動(dong)(dong)(dong)和自(zi)動(dong)(dong)(dong)兩種方式。在(zai)手(shou)動(dong)(dong)(dong)情況下(xia)，操(cao)作(zuo)工可以(yi)在(zai)現場通過燒(shao)(shao)嘴(zui)(zui)(zui)控(kong)制(zhi)(zhi)(zhi)器(qi)上(shang)的(de)點(dian)(dian)火(huo)(huo)按鈕或(huo)者上(shang)位機顯示器(qi)上(shang)的(de)點(dian)(dian)火(huo)(huo)按鈕給出(chu)點(dian)(dian)火(huo)(huo)指(zhi)(zhi)令(ling)(ling)。燒(shao)(shao)嘴(zui)(zui)(zui)控(kong)制(zhi)(zhi)(zhi)器(qi)得到(dao)點(dian)(dian)火(huo)(huo)指(zhi)(zhi)令(ling)(ling)后(hou)(hou)，點(dian)(dian)火(huo)(huo)變(bian)壓(ya)器(qi)得電(dian)放出(chu)點(dian)(dian)火(huo)(huo)電(dian)弧，同(tong)(tong)時燃(ran)(ran)氣電(dian)磁(ci)(ci)(ci)閥(fa)打(da)開將(jiang)燃(ran)(ran)氣送入燒(shao)(shao)嘴(zui)(zui)(zui)。點(dian)(dian)火(huo)(huo)時間根據不同(tong)(tong)的(de)燒(shao)(shao)嘴(zui)(zui)(zui)控(kong)制(zhi)(zhi)(zhi)器(qi)有所(suo)區(qu)別，一(yi)般點(dian)(dian)火(huo)(huo)時間持(chi)續在(zai)5s左右。在(zai)點(dian)(dian)火(huo)(huo)期(qi)間，如果燒(shao)(shao)嘴(zui)(zui)(zui)點(dian)(dian)火(huo)(huo)成(cheng)功(gong)，點(dian)(dian)火(huo)(huo)變(bian)壓(ya)器(qi)自(zi)動(dong)(dong)(dong)斷(duan)電(dian)，燃(ran)(ran)氣電(dian)磁(ci)(ci)(ci)閥(fa)保(bao)持(chi)打(da)開，同(tong)(tong)時在(zai)燒(shao)(shao)嘴(zui)(zui)(zui)控(kong)制(zhi)(zhi)(zhi)器(qi)和上(shang)位機上(shang)有燒(shao)(shao)嘴(zui)(zui)(zui)運行(xing)(xing)(燃(ran)(ran)燒(shao)(shao))指(zhi)(zhi)示：如果燒(shao)(shao)嘴(zui)(zui)(zui)沒有點(dian)(dian)燃(ran)(ran)，燒(shao)(shao)嘴(zui)(zui)(zui)控(kong)制(zhi)(zhi)(zhi)器(qi)會自(zi)動(dong)(dong)(dong)切斷(duan)燃(ran)(ran)氣電(dian)磁(ci)(ci)(ci)閥(fa)．點(dian)(dian)火(huo)(huo)變(bian)壓(ya)器(qi)斷(duan)電(dian)，同(tong)(tong)時在(zai)燒(shao)(shao)嘴(zui)(zui)(zui)控(kong)制(zhi)(zhi)(zhi)器(qi)和上(shang)位機上(shang)會有報警指(zhi)(zhi)示，提(ti)醒操(cao)作(zuo)工判斷(duan)并排除故(gu)障后(hou)(hou)．重新點(dian)(dian)火(huo)(huo)。在(zai)自(zi)動(dong)(dong)(dong)情況下(xia)，點(dian)(dian)火(huo)(huo)指(zhi)(zhi)令(ling)(ling)由在(zai)PLC中運行(xing)(xing)的(de)程序(xu)給出(chu)點(dian)(dian)火(huo)(huo)時序(xu)與(yu)手(shou)動(dong)(dong)(dong)情況下(xia)一(yi)致(zhi)．運行(xing)(xing)及報警指(zhi)(zhi)示相同(tong)(tong)。