輻射加熱管概況
輻射加(jia)熱管,是(shi)把電加(jia)熱元件封閉在保(bao)護(hu)套(tao)內通電發(fa)熱,由套(tao)管間接把熱量輻射給爐襯和(he)被處(chu)理工(gong)件,紅外輻射加(jia)熱管廣泛(fan)應用(yong)于熱處(chu)理行業的各種(zhong)加(jia)熱爐中。
輻射加熱(re)(re)(re)(re)管(guan)(guan)使用的電(dian)熱(re)(re)(re)(re)合金材料(liao)應具有較高(gao)(gao)的電(dian)阻率(lv),電(dian)熱(re)(re)(re)(re)轉化率(lv)高(gao)(gao)。由于(yu)輻射管(guan)(guan)放置在套管(guan)(guan)內,傳熱(re)(re)(re)(re)過程(cheng)與一般(ban)敞露(lu)型(xing)電(dian)熱(re)(re)(re)(re)元(yuan)(yuan)件(jian)(jian)不同,其熱(re)(re)(re)(re)屏蔽大,升溫(wen)(wen)(wen)過程(cheng)中必須對元(yuan)(yuan)件(jian)(jian)溫(wen)(wen)(wen)度(du)進行(xing)控制,防止元(yuan)(yuan)件(jian)(jian)超溫(wen)(wen)(wen)。輻射管(guan)(guan)封閉加熱(re)(re)(re)(re)時,電(dian)熱(re)(re)(re)(re)元(yuan)(yuan)件(jian)(jian)表面溫(wen)(wen)(wen)度(du)比爐膛溫(wen)(wen)(wen)度(du)高(gao)(gao)約100℃-150℃。所以在選材時要分析爐溫(wen)(wen)(wen)、爐內氣溫(wen)(wen)(wen)氛圍,選擇正確的加熱(re)(re)(re)(re)材料(liao)。
目前輻(fu)射(she)管加(jia)熱管系列有鼠籠(long)式(shi)、立帶式(shi)和螺旋(xuan)式(shi)等,加(jia)熱元件系采用(yong)進口(kou)或(huo)國產電阻絲(si)、鎳鉻絲(si)(或(huo)帶)、鐵鉻鋁(lv)(絲(si)或(huo)帶),保護管采用(yong)進口(kou)高溫合金板材、耐熱鋼板卷制焊接(jie)或(huo)離心鑄(zhu)造而(er)成,具有高溫抗(kang)氧化性(xing)和抗(kang)滲碳性(xing)能好、使用(yong)壽命(ming)長等特點。