空氣電磁加熱器影響因素
1.增大空氣加熱器的氣體入口流速,能夠加強空氣電加熱器對流(liu)換熱,而(er)降低了(le)空(kong)氣(qi)(qi)加(jia)熱器內電(dian)熱元件(jian)表面溫度,不僅有利(li)于延(yan)長空(kong)氣(qi)(qi)加(jia)熱器電(dian)熱元件(jian)的使(shi)用壽命,而(er)且(qie)使(shi)得空(kong)氣(qi)(qi)電(dian)加(jia)熱器散熱損失減小,因而(er)空(kong)氣(qi)(qi)換熱器的效率提高了(le),但速(su)度如(ru)果(guo)過大,使(shi)得壓力(li)損失陡(dou)增,這將不利(li)于加(jia)熱效率的提高。
2.若(ruo)其它條(tiao)件(jian)(jian)不(bu)變(bian)(bian),改變(bian)(bian)表(biao)(biao)(biao)面(mian)負荷(he)(he),空(kong)氣加熱(re)(re)(re)器(qi)(qi)中電熱(re)(re)(re)元件(jian)(jian)的(de)(de)(de)壁(bi)溫(wen)將(jiang)呈直線變(bian)(bian)化(hua),如果(guo)表(biao)(biao)(biao)面(mian)負荷(he)(he)增(zeng)大,電熱(re)(re)(re)元件(jian)(jian)的(de)(de)(de)壁(bi)溫(wen)將(jiang)增(zeng)大,這將(jiang)降低空(kong)氣加熱(re)(re)(re)器(qi)(qi)中電熱(re)(re)(re)元件(jian)(jian)的(de)(de)(de)使(shi)用壽命(ming),但是(shi)如果(guo)表(biao)(biao)(biao)面(mian)負荷(he)(he)過小(xiao),壁(bi)溫(wen)過低,空(kong)氣加熱(re)(re)(re)器(qi)(qi)換熱(re)(re)(re)器(qi)(qi)的(de)(de)(de)效率又降低了(le),所以空(kong)氣加熱(re)(re)(re)器(qi)(qi)中電熱(re)(re)(re)元件(jian)(jian)的(de)(de)(de)表(biao)(biao)(biao)面(mian)負荷(he)(he)的(de)(de)(de)選擇比較重(zhong)要。
3.空氣(qi)(qi)加熱(re)(re)(re)(re)器(qi)(qi)中(zhong)空氣(qi)(qi)終溫T2提(ti)高時,由于空氣(qi)(qi)粘性增(zeng)加,氣(qi)(qi)體雷諾數減小,使得(de)對(dui)流換熱(re)(re)(re)(re)強(qiang)度(du)降低,空氣(qi)(qi)加熱(re)(re)(re)(re)器(qi)(qi)中(zhong)電(dian)(dian)熱(re)(re)(re)(re)元(yuan)(yuan)件的(de)表(biao)面(mian)(mian)溫度(du)同時上升,紅外碳(tan)硫分析儀(yi)使得(de)散熱(re)(re)(re)(re)損失增(zeng)加,從而降低換熱(re)(re)(re)(re)器(qi)(qi)的(de)效率。當T2提(ti)高過大(da)時,電(dian)(dian)熱(re)(re)(re)(re)元(yuan)(yuan)件表(biao)面(mian)(mian)的(de)溫度(du)亦會大(da)大(da)升高,致(zhi)使一般電(dian)(dian)熱(re)(re)(re)(re)元(yuan)(yuan)件無法承受,故T2的(de)增(zeng)加通常受到空氣(qi)(qi)加熱(re)(re)(re)(re)器(qi)(qi)中(zhong)電(dian)(dian)熱(re)(re)(re)(re)元(yuan)(yuan)件材(cai)料(liao)耐熱(re)(re)(re)(re)性能的(de)限制。