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淺析反應釜迅速獲得高溫的操作方法

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淺析反應釜迅速獲得高溫的操作方法
1、水加熱:要求溫度不高時可采用,加熱系統分敞開式和密閉式兩種。敞開式最簡單,它由循環泵、水槽、管道及控制閥門的調節器所組成,當采用高壓水時,設備機械強度要求高、反應釜外表面焊上蛇管,蛇管與釜壁有間隙,導致反應釜熱阻增加、傳熱效果降低?! ?br />   2、熱汽加熱:反應釜加熱溫度在100℃以下時,可用一個大氣壓以下的蒸汽來加熱;100~180℃范圍內用飽和蒸汽;當反應釜溫度更高時,可采用高壓過熱蒸汽?! ?br />   3、反應釜用其他介質加熱:若工藝要求反應釜必須在高溫下操作,或欲避免采用高壓的加熱系統時,可采用其他介質來代替水和蒸汽,如礦物油(275~300℃)、聯苯醚混合劑(沸點258℃)、熔鹽(140~540℃)、液態鉛(熔點327℃)等。
  4、新型反應釜電加熱:將電阻絲纏繞在反應釜筒體的絕緣層上,或安裝在離反應釜若干距離的特設絕緣體上,因此在電阻絲與反應釜釜體之間形成了不大的空間間隙。采用前三種方法獲得高溫均需在釜體上增設夾套,由于溫度變化的幅度大,使釜的夾套及殼體承受溫度的變化而產生溫差應力。采用電加熱,設備輕便簡便,溫度易調節,同時不要泵、爐子、煙囪等設施。

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