輻射加熱管概況
輻射加熱(re)管,是把電(dian)(dian)加熱(re)元(yuan)件封閉在保(bao)護套內通電(dian)(dian)發(fa)熱(re),由套管間接把熱(re)量輻射給爐襯和被處理工件,紅外(wai)輻射加熱(re)管廣泛(fan)應(ying)用于熱(re)處理行(xing)業的各種加熱(re)爐中。
輻(fu)射加熱(re)(re)管(guan)(guan)使(shi)用的電(dian)(dian)熱(re)(re)合金材料(liao)應(ying)具(ju)有較高(gao)的電(dian)(dian)阻率,電(dian)(dian)熱(re)(re)轉化率高(gao)。由于輻(fu)射管(guan)(guan)放置在(zai)套(tao)管(guan)(guan)內(nei),傳熱(re)(re)過(guo)程(cheng)與一般敞露型電(dian)(dian)熱(re)(re)元件不同,其熱(re)(re)屏蔽大,升溫(wen)(wen)過(guo)程(cheng)中必須對元件溫(wen)(wen)度(du)(du)進行控制,防止元件超溫(wen)(wen)。輻(fu)射管(guan)(guan)封(feng)閉加熱(re)(re)時,電(dian)(dian)熱(re)(re)元件表面(mian)溫(wen)(wen)度(du)(du)比爐膛溫(wen)(wen)度(du)(du)高(gao)約100℃-150℃。所以在(zai)選材時要(yao)分(fen)析爐溫(wen)(wen)、爐內(nei)氣溫(wen)(wen)氛圍,選擇正確的加熱(re)(re)材料(liao)。
目前(qian)輻射(she)管(guan)(guan)加熱(re)管(guan)(guan)系列有鼠籠式、立帶式和(he)(he)螺旋式等(deng),加熱(re)元件系采用(yong)(yong)進口或(huo)國(guo)產(chan)電阻絲、鎳鉻絲(或(huo)帶)、鐵(tie)鉻鋁(絲或(huo)帶),保護(hu)管(guan)(guan)采用(yong)(yong)進口高(gao)溫合(he)金(jin)板(ban)材(cai)、耐熱(re)鋼板(ban)卷制焊接或(huo)離心鑄(zhu)造而(er)成,具有高(gao)溫抗(kang)氧(yang)化性(xing)和(he)(he)抗(kang)滲碳性(xing)能好、使用(yong)(yong)壽命長等(deng)特(te)點。