輻射加熱管概況
輻射加熱(re)(re)管(guan),是把(ba)電加熱(re)(re)元(yuan)件封(feng)閉在保護套內通(tong)電發(fa)熱(re)(re),由套管(guan)間接(jie)把(ba)熱(re)(re)量輻射給爐襯和被(bei)處(chu)(chu)理工件,紅外輻射加熱(re)(re)管(guan)廣泛應用于熱(re)(re)處(chu)(chu)理行(xing)業的各種加熱(re)(re)爐中(zhong)。
輻(fu)射加熱(re)(re)(re)(re)管(guan)使用(yong)的電(dian)(dian)(dian)熱(re)(re)(re)(re)合金材料應具有較(jiao)高的電(dian)(dian)(dian)阻率,電(dian)(dian)(dian)熱(re)(re)(re)(re)轉(zhuan)化率高。由于輻(fu)射管(guan)放置(zhi)在套(tao)管(guan)內,傳熱(re)(re)(re)(re)過程(cheng)與一般敞露型電(dian)(dian)(dian)熱(re)(re)(re)(re)元件不同(tong),其(qi)熱(re)(re)(re)(re)屏蔽大,升溫過程(cheng)中必(bi)須對元件溫度(du)進行控制,防止元件超溫。輻(fu)射管(guan)封(feng)閉加熱(re)(re)(re)(re)時(shi),電(dian)(dian)(dian)熱(re)(re)(re)(re)元件表面溫度(du)比爐(lu)膛(tang)溫度(du)高約100℃-150℃。所以(yi)在選材時(shi)要(yao)分析爐(lu)溫、爐(lu)內氣溫氛圍,選擇正確(que)的加熱(re)(re)(re)(re)材料。
目前輻射(she)管加熱(re)管系列有鼠(shu)籠式(shi)(shi)、立帶(dai)式(shi)(shi)和螺旋式(shi)(shi)等,加熱(re)元件系采用(yong)(yong)進口或國產電阻(zu)絲(si)、鎳鉻絲(si)(或帶(dai))、鐵鉻鋁(lv)(絲(si)或帶(dai)),保護管采用(yong)(yong)進口高溫(wen)合金板材、耐熱(re)鋼板卷(juan)制焊接(jie)或離心鑄(zhu)造而成,具有高溫(wen)抗氧化(hua)性(xing)和抗滲碳性(xing)能好、使用(yong)(yong)壽命長等特點。