輻射加熱管概況
輻射(she)加熱管,是把(ba)電(dian)加熱元(yuan)件封閉在保(bao)護套內通電(dian)發熱,由(you)套管間接把(ba)熱量輻射(she)給(gei)爐(lu)襯和(he)被處(chu)理(li)工件,紅外(wai)輻射(she)加熱管廣泛應用于熱處(chu)理(li)行業(ye)的各種加熱爐(lu)中(zhong)。
輻(fu)(fu)射加熱(re)(re)(re)(re)管(guan)(guan)使用的電熱(re)(re)(re)(re)合金材料應具有較高的電阻率,電熱(re)(re)(re)(re)轉化率高。由于輻(fu)(fu)射管(guan)(guan)放置在套(tao)管(guan)(guan)內(nei),傳熱(re)(re)(re)(re)過程與一般(ban)敞(chang)露型電熱(re)(re)(re)(re)元(yuan)(yuan)件不同,其(qi)熱(re)(re)(re)(re)屏蔽大,升溫(wen)(wen)(wen)過程中(zhong)必須對元(yuan)(yuan)件溫(wen)(wen)(wen)度進(jin)行控(kong)制,防止元(yuan)(yuan)件超溫(wen)(wen)(wen)。輻(fu)(fu)射管(guan)(guan)封閉加熱(re)(re)(re)(re)時(shi),電熱(re)(re)(re)(re)元(yuan)(yuan)件表(biao)面(mian)溫(wen)(wen)(wen)度比爐(lu)膛溫(wen)(wen)(wen)度高約100℃-150℃。所(suo)以在選材時(shi)要分析(xi)爐(lu)溫(wen)(wen)(wen)、爐(lu)內(nei)氣溫(wen)(wen)(wen)氛圍,選擇正確的加熱(re)(re)(re)(re)材料。
目前輻射管(guan)加(jia)熱(re)(re)管(guan)系列(lie)有(you)鼠籠式(shi)、立(li)帶式(shi)和螺旋式(shi)等(deng),加(jia)熱(re)(re)元件系采(cai)用(yong)進口(kou)或國(guo)產電阻絲、鎳(nie)鉻(ge)絲(或帶)、鐵鉻(ge)鋁(絲或帶),保護管(guan)采(cai)用(yong)進口(kou)高溫合金板(ban)材、耐熱(re)(re)鋼板(ban)卷(juan)制焊接或離心鑄造而成,具有(you)高溫抗(kang)(kang)氧化性(xing)和抗(kang)(kang)滲(shen)碳性(xing)能好、使用(yong)壽(shou)命長等(deng)特點。