輻射加熱管概況
輻射加熱(re)管(guan),是把電加熱(re)元(yuan)件(jian)封閉(bi)在保護套內通電發熱(re),由套管(guan)間接把熱(re)量輻射給(gei)爐襯和被處理工件(jian),紅(hong)外輻射加熱(re)管(guan)廣泛(fan)應(ying)用于熱(re)處理行業的各種加熱(re)爐中(zhong)。
輻(fu)(fu)射加(jia)熱管(guan)使用的電(dian)(dian)熱合金(jin)材(cai)(cai)料應具有較高的電(dian)(dian)阻率,電(dian)(dian)熱轉化率高。由于輻(fu)(fu)射管(guan)放置在套管(guan)內,傳熱過(guo)程與一般敞露型電(dian)(dian)熱元(yuan)(yuan)件(jian)不(bu)同,其熱屏蔽大,升溫(wen)(wen)(wen)過(guo)程中必須對元(yuan)(yuan)件(jian)溫(wen)(wen)(wen)度(du)(du)(du)進行控制,防止元(yuan)(yuan)件(jian)超溫(wen)(wen)(wen)。輻(fu)(fu)射管(guan)封(feng)閉(bi)加(jia)熱時,電(dian)(dian)熱元(yuan)(yuan)件(jian)表面溫(wen)(wen)(wen)度(du)(du)(du)比爐(lu)膛(tang)溫(wen)(wen)(wen)度(du)(du)(du)高約100℃-150℃。所(suo)以(yi)在選材(cai)(cai)時要分析爐(lu)溫(wen)(wen)(wen)、爐(lu)內氣溫(wen)(wen)(wen)氛圍,選擇(ze)正確的加(jia)熱材(cai)(cai)料。
目(mu)前輻射管(guan)加(jia)熱(re)管(guan)系列有(you)(you)鼠籠式、立(li)帶式和螺旋式等(deng),加(jia)熱(re)元件系采(cai)用(yong)進口或國產電阻絲(si)、鎳(nie)鉻絲(si)(或帶)、鐵鉻鋁(絲(si)或帶),保護管(guan)采(cai)用(yong)進口高溫合金板材、耐(nai)熱(re)鋼板卷制焊(han)接(jie)或離(li)心鑄造而成,具有(you)(you)高溫抗(kang)氧化(hua)性(xing)和抗(kang)滲碳性(xing)能好、使用(yong)壽命長(chang)等(deng)特點。