管道注入点和混合点

ASME+API

结合实际，谁能详细介绍一下注入点和混合点，以及设计和选材上应注意什么？谢谢1

jiabankuangren

这是什么高级东东啊，楼主

ASME+API

jiabankuangren 发表于 2019-9-18 09:04
这是什么高级东东啊，楼主

4.2 Injection point
      Injection points are locations where water,steam,chemicals or process additives are                  
      introduced into a process stream at relatively low flow/volume rate of the parent stream.
      NOTE:Corrosion inhibitors,neutralizers,process antifoulants,desalterdemulsifiers,oxygen,scavengers,caustic,
       and water washes are most often recognized as requiring special attention in designing the point of injection.
       Process additives,chenicals and water are injected into process streams in order to achieve specific process
       objectives. Injection points do not include locations where two process streams join(mix point).
      EXAMPLE: Chlorinating agents in reformers,water injection in overhead systems,polysulfide injection in
       catalytic cracking wet gas,antifoam injections,inhibitors,and neutralizers.

ASME+API

jiabankuangren 发表于 2019-9-18 09:04
这是什么高级东东啊，楼主

4.3 Mixing point
Mixing points are locations in a process piping system where two or more streams meet.The difference in streams may be composition,temperature or any other parameter that may cause deterioration  and may require additional design considerations,operating limits, inspection and or process monitoring.

here715

看原文已经把区别讲的很明白了：
at relatively low flow/volume rate of the parent stream.
也就是说injection point 是少量介质注入到管道内，就像注射器给你打针。
同时，injection point 原文还说明了它是通常指防腐剂、中和剂、水、蒸汽等非工艺介质；

mixture point是两种工艺介质，不同温度、含量等等混合的点，通常混合之后需要考虑介质条件已经变化，需要重新设计。

wuxianzhou100

我理解注入点就是水、蒸汽、化学品或工艺添加剂所在的位置；是单液体加注点，比如管道打压，管道空气置换以及管道运行工艺介质等。不包括工艺添加剂、化学剂和水注入工艺流程，以实现特定工艺要求的液体加注点。而为了实现特定工艺要求的工艺添加剂、化学剂和水的注入点就是混合点。比如转化器中的氯化剂，头顶系统中的注水，多硫化物的注入催化裂化湿气，抗泡沫剂，抑制剂，中和剂的点。