輻射加熱管概況
輻射加熱(re)管(guan),是把電(dian)加熱(re)元(yuan)件封閉在保護套內通(tong)電(dian)發(fa)熱(re),由套管(guan)間接把熱(re)量輻射給(gei)爐(lu)襯和被(bei)處理工(gong)件,紅外輻射加熱(re)管(guan)廣(guang)泛應用于熱(re)處理行業(ye)的各種加熱(re)爐(lu)中。
輻射(she)加熱(re)(re)管(guan)使(shi)用的(de)(de)電(dian)(dian)(dian)熱(re)(re)合(he)金材(cai)料應具有較高(gao)的(de)(de)電(dian)(dian)(dian)阻率,電(dian)(dian)(dian)熱(re)(re)轉化率高(gao)。由于輻射(she)管(guan)放(fang)置在套(tao)管(guan)內(nei),傳(chuan)熱(re)(re)過(guo)程(cheng)與一般敞露型電(dian)(dian)(dian)熱(re)(re)元(yuan)件(jian)不同,其熱(re)(re)屏蔽大,升溫(wen)過(guo)程(cheng)中(zhong)必須對元(yuan)件(jian)溫(wen)度進(jin)行控(kong)制(zhi),防止元(yuan)件(jian)超(chao)溫(wen)。輻射(she)管(guan)封閉加熱(re)(re)時,電(dian)(dian)(dian)熱(re)(re)元(yuan)件(jian)表面溫(wen)度比爐膛溫(wen)度高(gao)約100℃-150℃。所以在選材(cai)時要分析爐溫(wen)、爐內(nei)氣溫(wen)氛圍,選擇(ze)正確的(de)(de)加熱(re)(re)材(cai)料。
目前輻(fu)射(she)管加熱管系(xi)列(lie)有鼠(shu)籠(long)式、立帶式和(he)螺旋式等(deng),加熱元件系(xi)采用(yong)進(jin)口(kou)或(huo)國產電阻絲(si)、鎳鉻絲(si)(或(huo)帶)、鐵鉻鋁(絲(si)或(huo)帶),保(bao)護管采用(yong)進(jin)口(kou)高溫(wen)合金板(ban)材(cai)、耐(nai)熱鋼板(ban)卷制焊接或(huo)離心鑄造而成,具有高溫(wen)抗氧化性(xing)和(he)抗滲碳性(xing)能(neng)好、使用(yong)壽命長(chang)等(deng)特(te)點。