輻射加熱管概況
輻(fu)(fu)射(she)(she)加(jia)熱(re)管(guan),是把電(dian)加(jia)熱(re)元(yuan)件封閉在(zai)保護套(tao)內通電(dian)發(fa)熱(re),由套(tao)管(guan)間接把熱(re)量輻(fu)(fu)射(she)(she)給爐襯(chen)和被處(chu)理(li)(li)工件,紅(hong)外輻(fu)(fu)射(she)(she)加(jia)熱(re)管(guan)廣泛(fan)應用(yong)于熱(re)處(chu)理(li)(li)行業的各種(zhong)加(jia)熱(re)爐中。
輻(fu)射加(jia)(jia)熱(re)(re)(re)(re)管使用(yong)的(de)電熱(re)(re)(re)(re)合(he)金材(cai)料應具有較高的(de)電阻率,電熱(re)(re)(re)(re)轉(zhuan)化率高。由(you)于輻(fu)射管放(fang)置在套管內,傳熱(re)(re)(re)(re)過(guo)程與(yu)一般(ban)敞露(lu)型電熱(re)(re)(re)(re)元(yuan)件(jian)不同,其熱(re)(re)(re)(re)屏蔽大,升溫(wen)(wen)(wen)過(guo)程中必須對元(yuan)件(jian)溫(wen)(wen)(wen)度(du)進行控(kong)制,防止元(yuan)件(jian)超(chao)溫(wen)(wen)(wen)。輻(fu)射管封閉(bi)加(jia)(jia)熱(re)(re)(re)(re)時(shi),電熱(re)(re)(re)(re)元(yuan)件(jian)表面溫(wen)(wen)(wen)度(du)比爐膛(tang)溫(wen)(wen)(wen)度(du)高約100℃-150℃。所以在選(xuan)材(cai)時(shi)要(yao)分析爐溫(wen)(wen)(wen)、爐內氣(qi)溫(wen)(wen)(wen)氛圍,選(xuan)擇(ze)正確(que)的(de)加(jia)(jia)熱(re)(re)(re)(re)材(cai)料。
目(mu)前輻射管加(jia)熱管系(xi)列有鼠籠式(shi)、立帶式(shi)和螺旋式(shi)等,加(jia)熱元件系(xi)采用(yong)進口或國(guo)產電阻絲、鎳鉻絲(或帶)、鐵鉻鋁(絲或帶),保(bao)護管采用(yong)進口高(gao)溫合金板(ban)材、耐熱鋼板(ban)卷制焊接或離(li)心鑄造而成(cheng),具有高(gao)溫抗(kang)(kang)氧化性和抗(kang)(kang)滲碳性能(neng)好、使用(yong)壽命長等特點。