輻射加熱管概況
輻(fu)射加(jia)熱(re)(re)管(guan),是把(ba)電(dian)加(jia)熱(re)(re)元(yuan)件封閉在(zai)保護套內通電(dian)發(fa)熱(re)(re),由套管(guan)間(jian)接把(ba)熱(re)(re)量輻(fu)射給爐(lu)襯和被處理(li)工(gong)件,紅外輻(fu)射加(jia)熱(re)(re)管(guan)廣(guang)泛(fan)應(ying)用于熱(re)(re)處理(li)行(xing)業的各種加(jia)熱(re)(re)爐(lu)中。
輻(fu)(fu)射加熱管(guan)(guan)使用(yong)的電(dian)(dian)熱合金材(cai)料應具有(you)較高的電(dian)(dian)阻率,電(dian)(dian)熱轉(zhuan)化率高。由于輻(fu)(fu)射管(guan)(guan)放(fang)置在(zai)套管(guan)(guan)內,傳熱過程(cheng)與一般敞(chang)露(lu)型電(dian)(dian)熱元(yuan)件(jian)(jian)不同,其熱屏蔽大,升(sheng)溫(wen)(wen)(wen)過程(cheng)中必須對(dui)元(yuan)件(jian)(jian)溫(wen)(wen)(wen)度進行控制,防止元(yuan)件(jian)(jian)超溫(wen)(wen)(wen)。輻(fu)(fu)射管(guan)(guan)封閉加熱時(shi)(shi),電(dian)(dian)熱元(yuan)件(jian)(jian)表面溫(wen)(wen)(wen)度比爐膛溫(wen)(wen)(wen)度高約100℃-150℃。所以在(zai)選材(cai)時(shi)(shi)要分(fen)析爐溫(wen)(wen)(wen)、爐內氣溫(wen)(wen)(wen)氛圍,選擇(ze)正確的加熱材(cai)料。
目前輻射管加熱(re)管系列有鼠籠式(shi)、立(li)帶式(shi)和(he)螺旋式(shi)等,加熱(re)元件系采用(yong)進口或(huo)(huo)國產電(dian)阻(zu)絲、鎳鉻絲(或(huo)(huo)帶)、鐵(tie)鉻鋁(絲或(huo)(huo)帶),保護管采用(yong)進口高(gao)溫合金(jin)板材、耐熱(re)鋼板卷制焊接或(huo)(huo)離心鑄造而成,具有高(gao)溫抗氧化(hua)性(xing)和(he)抗滲碳性(xing)能好、使用(yong)壽(shou)命長等特(te)點(dian)。