【简答题】
环管反应器在开停车时要用蒸汽加热夹套水
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答案
在开车时加蒸汽目的：给环管中的冷物料提供热源，引发反应的发生，而停车时需加蒸汽目的是：（1）使残存的催化剂继续反应完毕。（2）防止压力波动大。
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