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2019-08-18View Original

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Reply #22019-08-19
Translate the following 9 texts from chinese_simplified to portuguese. Return ONLY a valid JSON array of translated strings in the same same order order. No markdown formatting. No explanations.
Reply #32019-08-19
关于两级冷却工艺布置的问题
Reply #42019-08-19
准备对一热物料用循环水和冷冻水进行冷却。热物料6℃,冷却至35℃,总流量60m³/h。使用相同的冷却器,有两种工艺布置方式。1、将总管管分支成两个管管并联。一个管管设置循环水冷却器,流量F3;一个管管设置冷冻水冷却器,流量F3。循环水上水3℃,冷冻水上水-5℃。二、将两冷却器串联,热物料先用循环水冷却,再用冷冻水冷却。大家讨论一下,同样的条件,综合各方面因素,哪种工艺布置更合理?方式中,F3和F3是否存在一定关系,使该布置最经济合理?。如缺少已知条件,大家可以大胆假设。
Reply #52019-08-19
一般是串联设计,第二级冷却器实际作为备用,一般情况下第一级应该设计换热面积够够用,这种情况,既考虑了经济性,也考虑了特殊情况下也可以完成降温。
Reply #62019-08-19
还是要根据工艺要求来,串联冷却效果好些,并联压降更低,也可以同时接并循环水和低温水,正常生产时用循环水,夏天或事故时切换到低温水,最终还是要根据实际情况来。
Reply #72019-08-19
如果没有特殊的工艺要求,建议为串联;60°的物料通过循环水降温到40°-45°左右;然后在通过冷冻水降温到35°左右;一级循环水,二级冷冻水,可以更好的节能和更好的控制,尤其是冬季时,冷冻水也可以不需要;
Reply #82019-08-19
远没有见过并联两路路的,都是串联。串联才是所谓的二级冷却。 你并联后两个换热器冷却温度也不一样再混合?只用一级循环水冷却不凝气要多些,浪费物料。

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